JP3142177U - Bone extension device - Google Patents

Abstract

The present invention provides a bone extension device that can reduce the burden on a patient, reduce the size of the device, and suppress the risk of infectious diseases.
A pump 11 is disposed in a wound 101 and is driven by a force acting from the wound 102. The liquid reservoir 12 is disposed in the wound 101, stores the liquid, communicates with the pump 11, and supplies the liquid with the operation of the pump 11. The extender 13 has a first fixing portion 15 and a second fixing portion 16 that are fixed to one bone 104 and the other bone 105 of the separated bone, respectively, and liquid is supplied from the pump 11. Thus, the interval between the first fixing part 15 and the second fixing part 16 is enlarged.
[Selection] Figure 1

Description

  The present invention relates to a bone extension device that extends a bone by expanding a distance between separated bones and growing bone tissue between the separated bones.

  Conventionally, there has been known a bone extension device that extends a bone (by forming a callus that is a new bone) by expanding the distance between the separated bones and growing bone tissue between the separated bones. (For example, refer to Patent Document 1). The bone extension device disclosed in FIG. 3 of Patent Document 1 is a so-called external fixator in which a main body portion is arranged outside the skin (that is, outside the body) outside the skin, and the separated bone is placed inside the skin. A steel wire or a pin member for fixing in the wound (that is, inside the body) is placed through the skin. And this bone extension apparatus is comprised so that a bone tissue may be made to grow between the isolate | separated bones while expanding the space | interval of the isolate | separated bones by the screw mechanism in the main-body part arrange | positioned out of the wound.

  On the other hand, FIG. 1, FIG. 2, and FIG. 4 of Patent Document 1 disclose a bone extension device that extends a bone by injecting a liquid such as physiological saline from the outside of the body. In Patent Document 1, this bone extension device is disclosed not as an external fixator but as a device that can be configured without providing a main body portion to be installed outside the wound. In this bone extension device, the liquid to be injected into the extender fixed to the separated bone is injected by a syringe or the like through an injection port provided in a hole formed through the skin. It is configured as follows.

JP-A-9-271478 (2nd page, Fig. 1-4)

  In the case of bone extension using a bone extension device as an external fixator as disclosed in FIG. 3 of Patent Document 1, a steel wire or the like for fixing the bone is disposed in a state of penetrating the skin. Therefore, there is a risk of infection. Further, in the case of this bone extension device, since the main body is installed outside the wound, there are many inconveniences, mental pains, and the like for the patient to which this bone extension device is applied, which tends to be a heavy burden. Furthermore, a predetermined distance is also required as an installation space between the body part and the skin installed outside the wound, and in order to ensure structural strength and rigidity as a bone extension device, the diameter of a steel wire or the like is required. It is also necessary to increase the size of the bone extension device as well as increase the risk of infectious diseases and the mental burden described above. On the other hand, in the case of the bone extension device disclosed in FIGS. 1, 2 and 4 of Patent Document 1, the skin is penetrated to inject liquid into the extender fixed to the separated bone. An injection port installed in the hole is required. This entails a risk of infection occurring through the injection port.

  In view of the above circumstances, the present invention provides a bone extension device that can reduce the burden on the patient, reduce the size of the device, and suppress the risk of infection. Objective.

  A bone extension device according to a first device for achieving the above object is a bone extension device that extends a bone by expanding a bone tissue between the separated bones while expanding a distance between the separated bones. A pump disposed in the wound that is inside the skin and driven by a force acting from outside the skin that is outside the skin, and a pump that is disposed in the wound, stores liquid and communicates with the pump, A liquid reservoir that supplies liquid in accordance with the operation of the first and second fixing parts fixed to one and the other bones of the separated bone, and the liquid from the pump Is provided, and an extender that expands the distance between the first fixing portion and the second fixing portion.

According to this device, in addition to the extender having the first and second fixing portions fixed to the separated bones, the pump and the liquid supplied to the extender when the pump is driven are stored. A liquid reservoir is also placed in the wound. The pump is driven by a force acting from outside the wound. For this reason, the bone distraction device operates in a state where all the components are arranged in the wound, no equipment is required to be installed outside the wound, and it is used for operation from the outside to the wound. It is not necessary to install a supply port or the like in the skin for supplying the liquid. As a result, the skin is sutured after the bone extension device is installed, so that the inside and outside of the wound are completely blocked by the skin. Thus, since the state where the inside and outside of the wound are completely blocked by the skin is maintained, the risk of occurrence of infectious diseases can be greatly suppressed. And since there is no apparatus installed outside the wound and all the components are arranged in the wound, burdens such as inconvenience and mental pain on the patient can be greatly reduced. Moreover, since it can be set as the structure which adjusts the action | operation of an extender by operating a pump repeatedly, size reduction of a pump can be achieved and size reduction as a bone extension apparatus can also be achieved.
Therefore, it is possible to provide a bone extension device that can reduce the burden on the patient, reduce the size of the device, and suppress the risk of infection.

  A bone extension device according to a second device is the bone extension device according to the first device, wherein the pump includes a plunger that reciprocates in accordance with a force acting from the outside of the wound, and the plunger is reciprocally movable. A plunger chamber through which the liquid from the liquid reservoir passes, and the extension unit has a hydraulic chamber to which the liquid from the pump is supplied, and the first fixing portion and the second fixing portion. A connecting unit that extends in a direction that expands the interval between the first fixed portion and the second fixed portion by being connected to a portion and supplying the liquid to the hydraulic chamber, and in the movement direction of the plunger The pressure receiving area of the plunger chamber is smaller than the pressure receiving area of the hydraulic pressure chamber in the extending direction of the connecting unit.

  According to this device, the pressure receiving area of the plunger chamber in the moving direction of the plunger in the pump is configured to be smaller than the pressure receiving area of the hydraulic pressure chamber in the extending direction of the connecting unit in the extender. For this reason, in the extension device, a driving force corresponding to the product value of the discharge pressure of the pump and the pressure receiving area in the connecting unit extension direction in the hydraulic pressure chamber is generated, and the liquid discharge amount due to the repeated operation of the pump is generated. Accordingly, the extension amount of the extender is adjusted. Thereby, even if the pressure receiving area of the plunger chamber is reduced and the pump is downsized, a large extension force can be produced, and the operation of the extension device can be easily adjusted. Therefore, it is possible to easily realize downsizing of the bone extension device by downsizing the pump.

  A bone extension device according to a third device is the bone extension device of the second device, wherein the extender is connected to the first fixing portion and the second fixing portion and the second fixing of the first fixing portion. It further has a guide part for restricting the relative movement direction with respect to the part.

  According to this device, the extension device is provided with the guide portion that regulates the relative movement direction of the first fixing portion with respect to the second fixing portion. For this reason, when the liquid is supplied to the hydraulic pressure chamber and the connection unit extends, the guide portion restricts the relative movement direction of the first fixing portion with respect to the second fixing portion (for example, the guide portion is straightened). If it is configured by a member extending along the direction, the relative movement direction of the first fixed portion with respect to the second fixed portion is regulated in the linear direction). As a result, the bone can be accurately grown along a desired direction with a simple mechanism of providing the guide portion.

  A bone extension device according to a fourth device is the bone extension device of either the second device or the third device, wherein the pump includes a main body block in which the plunger chamber is formed, the plunger, and the plunger. And a plunger base member that moves in a direction toward and away from the main body block, and a plunger unit that is attached to the main body block to form a region in which the plunger base member moves. And a case to be provided.

  According to this device, the pump is a simple mechanism in which a case is attached to a main body block provided with a plunger chamber in a state in which a plunger unit composed of a plunger and a plunger base member is housed. Composed. For this reason, the small pump arrange | positioned in a wound can be manufactured easily.

  The bone extension device according to a fifth aspect of the present invention is the bone extension device according to the fourth aspect, wherein the plunger base member reciprocates within the case by a magnetic force acting from outside the wound.

  According to this device, the plunger base member is reciprocated in the case by the magnetic force acting from outside, and the plunger is reciprocated in the plunger chamber together with the plunger base member to drive the pump. For this reason, by applying a magnetic force from outside the wound through the skin, the extension device can be operated by simply driving the pump.

  A bone extension device according to a sixth invention is the bone extension device according to the fifth invention, wherein the pump is disposed between the plunger base member and the case, and the plunger base member is moved from the case to the main body. A first spring member that is biased toward the block is provided.

  According to this device, the plunger base member is constantly biased toward the main body block by the first spring member disposed between the plunger base member and the case. For this reason, the plunger base member moves against the spring force of the first spring member when a magnetic force is applied from the outside of the wound. On the other hand, when the magnetic force is released, the plunger base member is moved by the spring force of the first spring member. It moves so as to return to the position before the magnetic force acts. As a result, the pump is driven. In addition, when the pump is arranged in the wound so that the case is closer to the skin than the plunger base member, the plunger base member resists the spring force by applying a magnetic force in the direction in which the attractive force is generated. Can be moved. Thereby, it becomes easy to implement | achieve the stable movement of the plunger accompanying the magnetic force in a plunger chamber. Therefore, a mechanism that efficiently controls stable driving of a small pump can be easily realized by a simple mechanism in which the first spring member is arranged at a predetermined position.

  A bone extension device according to a seventh aspect of the present invention is the bone extension device according to the sixth aspect, wherein the plunger base member is made of a magnetic material.

  According to this device, the plunger base member is formed of a magnetic material. For this reason, the pump is arranged in the wound so that the case is closer to the skin than the plunger base member, and the permanent magnet, electromagnet, etc. By applying a magnetic force by the magnet, the plunger base member moves in a direction attracting the magnet against the spring force of the first spring member, and the pump is driven. Therefore, it is possible to easily realize a mechanism capable of driving the pump by a simple operation of applying a magnetic force from the outside.

  A bone extension device according to an eighth device is the bone extension device according to the sixth device, wherein the plunger base member is formed of a magnet.

  According to this device, the plunger base member is formed of a magnet. For this reason, when the pump is arranged in the wound so that the case is positioned closer to the skin than the plunger base member, the pole of the plunger base member facing the skin (facing the case) Drive the pump by applying a magnetic force from the outside to the skin in the vicinity where the pump is placed so that it approaches the skin at a pole different from the pole on the side (permanent magnet or electromagnet). Can be operated. That is, by applying a magnetic force to the pump from outside the wound through the skin with the operating magnet, the plunger base member moves in a direction in which the magnets attract each other against the spring force of the first spring member, The pump will be driven. Therefore, it is possible to easily realize a mechanism capable of driving the pump by a simple operation in which a magnetic force is applied from the outside with the predetermined pole facing the skin. Furthermore, by forming the main body block with a material having very weak magnetism, it is possible to prevent the movement of the plunger base member from being disturbed by the magnetic force acting between the main body block and the plunger base member.

  A bone extension device according to a ninth device is the bone extension device according to the fourth device, wherein the pump is disposed between the plunger base member and the main body block, and the plunger base member is removed from the main body block. A second spring member biased toward the case is provided, and the case is formed to be elastically deformable by a pressing force acting from outside the wound.

  According to this device, the plunger base member is constantly biased toward the case by the second spring member disposed between the plunger base member and the main body block. The case is formed so as to be elastically deformable from the outside by a pressing force by a finger, a hand, or various devices. Therefore, the plunger base member moves against the spring force of the second spring member as the case is deformed when a pressing force is applied from the outside of the wound, while the second spring is moved when the pressing force is released. It moves so as to return to the position before the pressing force is applied by the spring force of the member. As a result, the pump is driven. By placing the pump inside the wound so that the case is closer to the skin than the plunger base member, the pressure from the outside of the wound can be transmitted to the pump more efficiently and stably. it can. Therefore, a mechanism that efficiently controls stable driving of a small pump can be easily realized by a simple mechanism that allows the case to be elastically deformed by arranging the second spring member at a predetermined position.

  A bone extension device according to a tenth device is the bone extension device according to any one of the second device to the ninth device, wherein the connection unit includes a cylinder in which the hydraulic chamber is formed, and a liquid in the hydraulic chamber. And a rod protruding from the cylinder in a direction in which the distance between the first fixed portion and the second fixed portion is increased, and the rod together with the hydraulic chamber is provided in the cylinder. A medicine chamber for storing medicine is formed, and the fluid from the pump is supplied to the fluid pressure chamber so that the fluid pressure chamber expands and the rod extends from the cylinder. In addition to protruding, the medicine stored in the medicine chamber is discharged from the cylinder.

  According to this device, the connecting unit is composed of a cylinder and a rod, and a hydraulic pressure chamber and a drug chamber are defined in the cylinder by the end of the rod. When the liquid is supplied to the hydraulic chamber and the extender is operated, the medicine stored in the medicine chamber is also discharged and supplied in the wound. For this reason, when it is necessary to supply a required amount of medicine every time the bone extension device is operated, the required amount of medicine is supplied each time the bone extension device is operated without performing a procedure of supplying the medicine from outside the wound. The drug will be supplied in the wound. Therefore, it is possible to reduce the burden on the patient, to reduce the size of the device, to reduce the risk of infectious diseases, and to provide a bone extension device that can easily and efficiently supply a medicine. can do.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the burden on a patient and miniaturizing an apparatus, the bone extension apparatus which can suppress the outbreak risk of an infectious disease can be provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that the bone extension device according to the embodiment of the present invention can be widely applied as a bone extension device that extends the bone by expanding the distance between the separated bones and growing the bone tissue between the separated bones. It is.

[First Embodiment]
(Overall configuration of the bone extension device)
1 and 2 are views showing a state in which the bone extension device 1 is applied to a human body with respect to the bone extension device 1 according to the first embodiment of the present invention. FIG. 1 is a perspective view, FIG. Shows cross-sectional schematic views, respectively. In FIG. 1, the human body is shown with a part of the outer shape of the skin 100, and the bone extension device 1 disposed in the wound is shown in a transparent state in which illustration of the human tissue is appropriately omitted. Further, in FIG. 2, the oblique lines indicating the cross-sectional state are omitted for the human tissue, and each region of the wound 101 inside the skin and the wound 102 outside the skin is indicated by arrows. 1 and 2 exemplify a case where the bone extension device 1 is applied to the femur 103. FIG.

  1 and 2 expands the distance between bones (104, 105) separated by osteotomy or the like in the femur 103 and between the separated bones (104, 105). It is used to extend the femur 103 by growing bone tissue while generating a callus 106 which is a new bone. The bone extension device 1 includes a pump 11, a liquid reservoir 12, an extension device 13, and the like.

(Configuration of liquid reservoir)
As shown in FIGS. 1 and 2, the liquid reservoir 12 is disposed in the wound 101. The liquid reservoir 12 is disposed in the wound 101 in a state where a liquid such as physiological saline is stored. The liquid reservoir 12 stores liquids that do not adversely affect the human body, such as glucose solution, Ringer's solution, and simulated body fluid, other than physiological saline. The liquid reservoir 12 is formed, for example, as a deformable bag body using silicon rubber, and is disposed in the wound 101 so as to communicate with a pump 11 described later via a tube 14. As the tube 14, for example, a tube made of silicon rubber is used. The liquid reservoir 12 is configured to supply the liquid stored therein via the tube 14 in accordance with the operation of the pump 11. As the liquid stored inside decreases, the liquid reservoir 12 will deform to collapse.

(Configuration of extender)
As shown in FIGS. 1 and 2, the extender 13 includes a first fixing portion 15, a second fixing portion 16, a connecting unit 17, a guide portion 22, and the like. The first fixing portion 15 and the second fixing portion 16 are formed using, for example, a titanium alloy, and are formed in a block shape having a surface arranged along each of the separated bones (104, 105). Is done. The first fixing portion 15 is fixed to one bone 104 in the separated bones (104, 105), and the second fixing portion 16 is fixed to the other bone 105. The 1st fixing | fixed part 15 and the 2nd fixing | fixed part 16 are each fixed to each bone | frame (104,105) using a screw member, for example.

  As shown in FIGS. 1 and 2, the connecting unit 17 includes a cylinder 18 and a rod 19. The cylinder 18 is fixed to the second fixing portion 16, and a hydraulic chamber 20 and a drug chamber 21 are formed therein. The hydraulic chamber 20 is configured such that the liquid from the pump 11 is supplied via the tube 23. As the tube 23, for example, a tube made of silicon rubber is used. On the other hand, the medicine chamber 21 appropriately stores medicines that need to be supplied to the place where the callus 106 is generated.

  The rod 19 in the connection unit 17 is attached such that one end side thereof is rotatable with respect to the first fixed portion 15, and the other end side is movably disposed along the cylinder 18 in the cylinder 18. In the cylinder 18, the hydraulic chamber 20 and the drug chamber 21 are partitioned by the end portion on the other end side of the rod 19. The other end of the rod 19 is slidably in contact with the inner wall of the cylinder 18. The space between the end of the rod 19 and the inner wall of the cylinder 18 is within the hydraulic chamber 20. The liquid and the medicine in the medicine chamber 21 are sealed so as not to communicate with each other. In the rod 19, the liquid is supplied to the hydraulic chamber 20 via the tube 23, so that the distance between the first fixing portion 15 and the second fixing portion 16 is increased (longitudinal direction of the femur 103). Are provided so as to protrude from the cylinder 18. Thus, by providing the cylinder 18 and the rod 19, the connecting unit 17 is connected to the first fixing portion 15 and the second fixing portion 16, and the liquid is supplied to the hydraulic pressure chamber 20 to perform the first fixing. It is comprised so that the space | interval of the part 15 and the 2nd fixing | fixed part 16 may be expanded in the direction which expands.

  Further, in the connecting unit 17, the liquid from the pump 11 is supplied to the hydraulic chamber 20, so that the hydraulic chamber 20 expands and the rod 19 protrudes from the cylinder 18 and is stored in the drug chamber 21. The medicine is discharged from the cylinder 18. In addition, about the discharge port of a chemical | medical agent, you may be comprised so that it may discharge from the opening part which the rod 19 protrudes from the cylinder 18, for example. In addition, a medicine discharge port that communicates the medicine chamber 21 with the outside of the cylinder 18 may be formed in the cylinder 18 independently. Note that the medicine chamber 21 is not necessarily provided, and the connecting unit 17 can be used in a state where no medicine is stored in a portion corresponding to the medicine chamber 21 in the cylinder 18.

  As shown in FIG. 1, the guide portion 22 is formed as a pair of linear round bar members connected to the first fixing portion 15 and the second fixing portion 16. One end side of each round bar member constituting each guide portion 22 is fixedly attached to the first fixing portion 15 so as to protrude from the first fixing portion 15, and the other end side is attached to the second fixing portion 16. Each of the holes is slidably inserted into the formed holes. Thereby, the guide part 22 is comprised so that the relative moving direction with respect to the 2nd fixing | fixed part 16 of the 1st fixing | fixed part 15 may be controlled to a linear direction.

  The extender 13 is configured to increase the interval between the first fixing portion 15 and the second fixing portion 16 by supplying the liquid from the pump 11 via the tube 23 by having the above-described configuration. Yes. In the extension device 13, a ratchet mechanism that restricts movement in the return direction when the distance between the first fixing portion 15 and the second fixing portion 16 is increased may be appropriately provided.

(Pump configuration)
As shown in FIGS. 1 and 2, the pump 11 is disposed in the wound 101 and is driven by a magnetic force acting from outside the wound by an electromagnet 108 in a magnetic force generator 107 as will be described later. When the pump 11 is operated, the liquid stored in the liquid reservoir 12 is sucked through the tube 14 and further supplied to the hydraulic chamber 20 of the extender 13 through the tube 23. become.

  3 and 4 are cross-sectional views of the pump 11. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 3 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 3 and 4, the pump 11 includes a main body block 24, a plunger unit 25, a case 26, a coil spring 29, and the like. In the pump 11, the first check valve 30 and the second check valve 31 are disposed in the pump 11. Further, the pump 11 has an inflow portion 32 that is connected to the tube 14 and into which the liquid from the liquid reservoir 12 flows, and an outflow portion 33 that is connected to the tube 23 and into which the liquid supplied to the extension device 13 flows out. Is provided.

  The main body block 24 is formed of a metal material or the like having a very weak magnetism (for example, austenitic stainless steel, titanium, or the like). As shown in FIGS. 3 and 4, the main body block 24 includes the first check valve 30 and the second check valve 31, and is provided with the inflow portion 32 and the outflow portion 33 protruding. It has been. The main body block 24 is formed with a round hole-like plunger chamber 34 and a passage 35 and a passage 36 through which liquid passes. The passage 35 is formed so as to communicate with the through hole 32 a formed through the inflow portion 32 via the first check valve 30, and the passage 36 includes a through hole 33 a formed through the outflow portion 33. It is formed so as to communicate with the second check valve 31. The plunger chamber 34 communicates with the passage 35 and the passage 36, and is configured such that the liquid flowing in from the passage 35 passes through and flows out to the passage 36. That is, the liquid that has flowed in from the liquid reservoir 12 through the tube 14, the inflow portion 32, and the first check valve 30 passes through the plunger chamber 34, and passes through the passage 36, the second check valve 31, the outflow portion 33, and It can be supplied to the extender 13 through the tube 23. A plunger 27 described later is disposed in the plunger chamber 34 so as to freely reciprocate.

  As shown in FIGS. 3 and 4, the plunger unit 25 includes a plunger 27 and a plunger base member 28. The plunger 27 is formed in a round bar shape, and is arranged so as to be able to reciprocate in a state where it is in sliding contact with the inner peripheral wall of the plunger chamber 34. As will be described later, the plunger 27 enters the plunger chamber 34 to the back side in accordance with the force (magnetic force) acting from the magnetic force generator 107 located on the wound exterior 102 (shown in FIG. 3). Position) and a protruding position (position shown in FIG. 5) that protrudes greatly from the plunger chamber 34 toward the case 26 side. 5 is a cross-sectional view of the pump 11 for explaining the operation of the pump 11, and corresponds to FIG.

  When the plunger 27 is at the above-described entry position, the plunger 27 is in a state of being accommodated in the plunger chamber 34. On the other hand, when the plunger 27 is in the protruding position, the passage 35 and the passage 36 are in communication with each other via the plunger chamber 34. And if the plunger 27 moves from an approach position to a protrusion position, the volume in which the liquid can flow in in the plunger chamber 34 will expand. When the pressure of the liquid in the plunger chamber 34 decreases with the operation of the plunger 27, the first check valve 30 is opened and the liquid supplied from the inflow portion 32 flows into the plunger chamber 34. (That is, a suction operation by the plunger 27 is performed). At this time, the second check valve 31 is maintained in the closed state, and the backflow of the liquid from the outflow portion 33 does not occur. On the other hand, when the plunger 27 moves from the protruding position to the entry position, the volume in the plunger chamber 34 decreases, and the liquid in the plunger chamber 34 is pushed out by the plunger 27 (that is, the plunger 27). Will be performed). As a result, the second check valve 31 is opened and the liquid in the plunger chamber 34 flows to the outflow portion 33. At this time, the first check valve 30 is maintained in a closed state, and no liquid flows in from the inflow portion 32.

  The first check valve 30 described above is provided as a valve structure that allows the flow of liquid from the liquid reservoir 12 to the pump 11 and restricts the flow in the reverse direction, as shown well in FIG. The main body block 24 includes a valve body 30a, a valve seat 30b, a back pressure chamber 30c, a spring 30d, and the like. The back pressure chamber 30c side communicating with the passage 35 is formed so as to be wider than the side communicating with the inflow portion 32. When the plunger 27 is in the entry position, the spring of the spring 30d disposed in the back pressure chamber 30c. The valve body 30a is urged to abut against the valve seat 30b by the force and the urging force due to the pressure of the liquid in the back pressure chamber 30c, and the first check valve 30 is in a closed state. When the plunger 27 moves to the protruding position (when the above-described suction operation is performed), the pressure of the liquid in the back pressure chamber 30c decreases as the pressure of the liquid in the plunger chamber 34 decreases. As a result, the urging force due to the liquid pressure in the back pressure chamber 30c and the urging force due to the liquid pressure from the inflow portion 32 become larger than the spring force of the spring 30d, and the valve body 30a is separated from the valve seat 30b. The liquid flows into the plunger chamber 34 from the inflow portion 32 (in a valve open state). When the operation is not performed by the plunger 27, the biasing force due to the liquid pressure in the back pressure chamber 30c and the spring force of the spring 30d are greater than the biasing force due to the liquid pressure from the inflow portion 32. The first check valve 30 is closed.

  Further, the second check valve 31 described above is provided as a valve structure that allows the flow of liquid from the pump 11 to the extender 13 and restricts the flow in the reverse direction. As shown in FIG. It is built in the main body block 24 and includes a valve body 31a, a valve seat 31b, a back pressure chamber 31c, a spring 31d, and the like. The back pressure chamber 31c side communicating with the outflow portion 33 is formed so as to be wider than the side communicating with the passage 36. When the plunger 27 is in the protruding position, the spring force of the spring 31d and the back pressure chamber 31c The valve element 31a is urged to abut against the valve seat 31b by the urging force due to the pressure of the liquid, and the second check valve 31 is in a closed state. When the plunger 27 moves to the entry position (when the aforementioned discharge operation is performed), the pressure of the liquid on the side communicating with the passage 36 in the second check valve 31 as the pressure in the plunger chamber 34 increases. Rises. As a result, the biasing force due to the pressure of the liquid on the side communicating with the passage 36 becomes larger than the biasing force due to the pressure of the liquid in the back pressure chamber 31c and the spring force of the spring 31d, and the valve body 31a is separated from the valve seat 31b. The liquid flows out from the plunger chamber 34 to the outflow portion 33 while sitting (being opened). When the plunger 27 is not discharged, the biasing force due to the pressure of the liquid in the back pressure chamber 31c and the spring force of the spring 31d are on the side communicating with the passage 36 in the second check valve 31. It is larger than the urging force due to the pressure of the liquid, and the second check valve 31 is closed.

  The plunger base member 28 in the plunger unit 25 is disposed in a region partitioned between the case 26 and the main body block 24 as shown in FIGS. 3 and 5. The plunger base member 28 is formed of a magnetic material (for example, martensitic or ferritic stainless steel, steel, etc.), and one end side of the plunger 27 is fixed to the central portion thereof (that is, The plunger 27 is attached to the plunger base member 28 in a cantilever state). The plunger base member 28 is disposed so as to be movable toward and away from the main body block 24, and reciprocates in the case 26 by a magnetic force acting from a magnetic force generation device 107 located on the external wound 102. Are arranged as follows.

  The plunger base member 28 is formed with a through hole 37, a convex portion 38, and a spring support hole 40. For example, clean air is sealed in the case 26, and when the plunger base member 28 reciprocates in the case 26, the air in the case 26 passes through the through-hole 37, so that the plunger base member The flow resistance that hinders the movement of 28 is mitigated. Further, the convex portion 38 is formed as a raised portion in the plunger base member 28 so as to protrude hemispherically on the side where the plunger 27 protrudes. The spring support hole 40 is formed in the plunger base member 28 so as to open to a side opposite to the side from which the convex portion 38 protrudes at a position corresponding to the convex portion 38. A coil spring 29 is disposed in the spring support hole 40. The main body block 24 is formed with a hemispherical concave portion 39 that is recessed at a position corresponding to the convex portion 38. When the plunger base member 28 is close to the main body block 24 (the state shown in FIG. 3), the convex portion 38 enters the concave portion 39 and is in a state where it is fitted through a slight gap. . Thus, the reciprocating operation of the plunger base member 28 is provided by providing the convex portion 38 disposed at a position corresponding to the spring support hole 40 and the concave portion 39 disposed at a position corresponding to the convex portion 38. It is possible to efficiently ensure a large stroke that can be achieved in the small pump 11.

  The case 26 is formed in a box shape with a wide opening formed on one side, and is formed of a material having very weak magnetism (for example, austenitic stainless steel, titanium, etc.). As shown in FIGS. 3 and 5, the case 26 is attached to the main body block 24 at the edge portion forming the opening, and the internal space forms an area in which the plunger base member 28 moves. Yes.

  The coil spring 29 constitutes a first spring member in the present embodiment. As shown in FIGS. 3 and 5, the coil spring 29 is disposed between the plunger base member 28 and the case 26 in a state of being disposed in the spring support hole 40 of the plunger base member 28. Accordingly, the coil spring 29 is disposed so as to bias the plunger base member 28 from the case 26 toward the main body block 24.

  In the pump 11 having the above-described configuration, the pressure receiving area of the plunger chamber 34 in the moving direction of the plunger 27 (the cross-sectional area of the plunger chamber 34 in the direction perpendicular to the moving direction of the plunger 27) is the connecting unit described above. 17 is set to be smaller than the pressure receiving area of the hydraulic chamber 20 in the extending direction 17 (the cross-sectional area of the hydraulic chamber 20 in the direction perpendicular to the extending direction of the connecting unit 17). Thus, even if the pressure receiving area of the plunger chamber 34 is set small, the same pressure as the discharge pressure of the pump 11 acts on the hydraulic chamber 20 of the extender 13 via the tube 23 based on the Pascal principle. Will do. For this reason, even if it is the small pump 11, big extension force can be taken out and the extension amount of the extension device 13 will be adjusted according to the discharge amount of the liquid by repeated operation | movement.

(Operation of bone extension device)
The bone extension device 1 described above is applied to the femur 103 as illustrated in FIGS. 1 and 2. And the 1st fixing | fixed part 15 and the 2nd fixing | fixed part 16 of the extender 13 are each fixed with respect to the isolate | separated bone (104,105) in the femur 103, and the pump 11 and the liquid reservoir 12 are also tube (14). , 23) and placed in the wound 101. The pump 11 is arranged in the wound 101 so that the case 26 is positioned closer to the skin 100 than the plunger base member 28. In the bone extension device 1, the operation in which all the components are arranged in the wound 101 is completed, the skin 100 is sutured, and the wound 101 and the wound 102 are blocked through the skin 100. In this state, it will be operated.

  As shown in FIGS. 1 and 2, the bone extension device 1 is operated by the magnetic force generated by the electromagnet 108 in the magnetic force generation device 107 being excited from the wound 102. Even when the magnetic force generator 107 is disposed near the skin 100, the pump 11 is in the state shown in FIGS. 3 and 4 when the electromagnet 108 is demagnetized. That is, in the pump 11, the plunger base member 28 is urged from the case 26 toward the main body block 24 by the spring force of the coil spring 29, and the plunger base member 28 is moved to a position where the convex portion 38 fits into the concave portion 39. Is approaching or abutting against the main body block 24. At this time, the plunger 27 fixed to the plunger base member 28 is located at the entry position where the plunger 27 has entered the far side of the plunger chamber 34. At this time, the first check valve 30 and the second check valve 31 are closed, and the liquid in the liquid reservoir 12 is not supplied to the extension device 13.

  From the state described above, when the magnetic force generator 107 is disposed in the vicinity of the skin 100 in the vicinity of the wound 11 on the external wound 102 and the electromagnet 108 is excited, the magnetic force of the electromagnet 108 acts from the external wound 102. Thus, the pump 11 is driven. When the magnetic force of the electromagnet 108 acts on the pump 11 from the case 26 side, the plunger base member 28 made of a magnetic material moves in a direction away from the main body block 24 against the spring force of the coil spring 29. Become. Then, together with the plunger base member 28, the plunger 27 fixed thereto moves along the plunger chamber 34 to the protruding position shown in FIG. 5, and the passage 35 and the passage 36 communicate with each other. When the suction operation by the plunger 27 is performed, as described above, the first check valve 30 is opened, and the liquid stored in the liquid reservoir 12 passes through the tube 14 and the inflow portion 32 to reach the plunger chamber 34. Flow into. At this time, the second check valve 31 is kept closed.

  When the suction operation by the plunger 27 is completed, an operation for releasing the excitation of the electromagnet 108 (operation for demagnetizing) is then performed in the magnetic force generator 107. As a result, no magnetic force acts on the pump 11 from the external wound 102, and the plunger base member 28 moves in a direction approaching the main body block 24 by the spring force of the coil spring 29. Then, the plunger 27 moves together with the plunger base member 28 along the plunger chamber 34 to the entry position shown in FIGS. When the discharge operation by the plunger 27 is performed, as described above, the second check valve 31 is opened, and the liquid in the plunger chamber 34 flows out from the outflow portion 33 and extends through the tube 23. 13 hydraulic pressure chambers 20 are supplied. At this time, the first check valve 30 is kept closed.

  As described above, the pump 11 is driven by the magnetic force acting from the external 102 so that the liquid stored in the liquid reservoir 12 passes through the pump 11 and is supplied to the hydraulic chamber 20 of the extender 13. When the liquid is supplied to the hydraulic chamber 20, the hydraulic chamber 20 expands and a relative movement of the cylinder 18 with respect to the rod 19 occurs, and the connecting unit 17 extends (see FIGS. 1 and 2). . Thereby, the space | interval of the 1st fixing | fixed part 15 to which the one end side of the rod 19 was attached, and the 2nd fixing | fixed part 16 to which the cylinder 18 was fixed is expanded, and the 1st fixing | fixed part 15 and the 2nd fixing | fixed part 16 are each fixed. The distance between the separated bones (104, 105) will be extended.

  Since the pump 11 is small and has a small discharge amount per time, the extension operation of the coupling unit 17 is appropriately adjusted by repeating the driving operation of the pump 11 described above a desired number of times. Then, a new bone tissue is generated between the bones (104, 105) whose distance is extended, and the callus 106 grows. In this way, the femur 103 is extended. In the drive operation of the pump 11 described above, the operation of repeating the excitation and demagnetization of the electromagnet 108 in the magnetic force generator 107 is illustrated, but this need not be the case. For example, the magnetic force acting on the pump 11 may be changed and operated by moving the magnetic force generator 107 close to or away from the skin 100 while the electromagnet 108 is excited. Further, the magnetic force acting on the pump 11 may be changed and operated by moving the permanent magnet closer to or away from the skin 100 without using the magnetic force generator 107 including the electromagnet 108.

(Effect of bone extension device)
According to the bone extension device 1 described above, in addition to the extender 13 having the first and second fixing portions (15, 16) fixed to the separated bones (104, 105), the pump 11 and the pump 11 The liquid reservoir 12 in which the liquid to be supplied to the extension device 13 is stored by being driven is also disposed in the wound 101. Then, the pump 11 is driven by a force acting from the external wound 102. For this reason, the bone extension device 1 operates in a state where all the components are arranged in the wound 101, equipment that is installed on the wound 102 is unnecessary, and the wound 102 to the wound 101 It is not necessary to install a supply port or the like on the skin 100 to supply the working liquid to the skin. As a result, a skin suture treatment or the like is performed after the bone extension device 1 is installed, so that the inside of the wound 101 and the outside of the wound 102 are kept completely blocked by the skin 100. As described above, since the state where the wound 101 and the wound 102 are completely cut off by the skin 100 is maintained, the risk of infectious diseases can be greatly suppressed. And since there is no apparatus installed in the wound 102 and all the components are arranged in the wound 101, burdens such as inconvenience and mental pain on the patient can be greatly reduced. Moreover, since it can be set as the structure which adjusts the action | operation of the extender 13 by operating the pump 11 repeatedly, size reduction of the pump 11 can be achieved and size reduction as the bone extension apparatus 1 can also be achieved.

  Therefore, it is possible to provide the bone extension device 1 that can reduce the burden on the patient, reduce the size of the device, and suppress the risk of infection.

  Further, according to the bone extension device 1, the pressure receiving area of the plunger chamber 34 in the moving direction of the plunger 27 in the pump 11 is larger than the pressure receiving area of the hydraulic chamber 20 in the extending direction of the connecting unit 17 in the extender 13. It is comprised so that it may become small. For this reason, in the extension device 13, a driving force corresponding to the magnitude of the product value of the discharge pressure of the pump 11 and the pressure receiving area in the connecting unit extension direction in the hydraulic pressure chamber 20 is generated. The extension amount of the extender 13 is adjusted according to the discharge amount. Thereby, even if the pressure receiving area of the plunger chamber 34 is reduced and the pump 11 is downsized, the operation of the extender 13 can be easily adjusted. Accordingly, it is possible to easily realize downsizing of the bone extension device 1 by downsizing the pump 11.

  Further, according to the bone extension device 1, the extender 13 is provided with the guide portion 22 that regulates the relative movement direction of the first fixing portion 15 with respect to the second fixing portion 16. For this reason, when the liquid is supplied to the hydraulic chamber 20 and the connecting unit 17 extends, the guide portion 22 restricts the relative movement direction of the first fixing portion 15 relative to the second fixing portion 16. Thereby, the femur 103 can be accurately grown in a desired direction with a simple mechanism of providing the guide portion 22.

  Further, according to the bone extension device 1, the first and second check valves (30, 31) for regulating the flow of liquid from the liquid reservoir 12 to the pump 11 and the flow of liquid from the pump 11 to the extender 13, respectively. ) Is provided. For this reason, it is possible to configure a supply path for efficiently supplying the liquid from the liquid reservoir 12 to the extender 13 with the operation of the pump 11.

  Further, according to the bone extension device 1, the pump 11 is in a state in which the plunger unit 25 including the plunger 27 and the plunger base member 28 is accommodated in the main body block 24 provided with the plunger chamber 34. It is comprised with the simple mechanism to which case 26 was attached. For this reason, the small pump 11 arrange | positioned in the wound 101 can be manufactured easily.

  Further, according to the bone extension device 1, the plunger base member 28 reciprocates in the case 26 by the magnetic force acting from the external wound 102, and the plunger 27 reciprocates in the plunger chamber 34 together with the plunger base member 28. Then, the pump 11 is driven. For this reason, by applying a magnetic force from the wound 102 via the skin 100, the pump 11 can be easily driven to operate the extender 13.

  Further, according to the bone extension device 1, when the magnetic force from the external wound 102 is released by the spring force of the coil spring 29 disposed between the plunger base member 28 and the case 26, the plunger base member 28 has a magnetic force. It moves to return to the position of the state before the action. Thereby, the pump 11 is driven efficiently. In addition, when the pump 11 is arranged in the wound 101 so that the case 26 is located closer to the skin 100 than the plunger base member 28, the magnetic force is applied in the direction in which the attractive force is generated to resist the spring force. Thus, the plunger base member 28 can be moved. Thereby, it becomes easy to realize the stable movement of the plunger 27 accompanying the magnetic force in the plunger chamber 34. Therefore, a mechanism that efficiently controls stable driving of the small pump 11 can be easily realized by a simple mechanism in which the coil spring 29 is arranged at a predetermined position.

  Further, according to the bone extension device 1, the plunger base member 28 is formed of a magnetic material. For this reason, the pump 11 is arranged in the wound 101 so that the case 26 is located closer to the skin 100 than the plunger base member 28, and the wound 11 is external to the skin 100 in the vicinity where the pump 11 is arranged. By applying a magnetic force from 102 to the electromagnet 108, the plunger base member 28 moves in a direction attracted to the electromagnet 108 against the spring force of the coil spring 29, and the pump 11 is driven. Therefore, it is possible to easily realize a mechanism capable of driving the pump by a simple operation of applying a magnetic force from the external 102.

  Further, according to the bone extension device 1, when the liquid is supplied to the hydraulic chamber 20 and the extender 13 is operated, the medicine stored in the medicine chamber 21 is also discharged and supplied in the wound 101. Yes. For this reason, when it is necessary to supply a required amount of medicine every time the bone extension device 1 is operated, it is necessary for every operation of the bone extension device without performing a treatment for supplying the medicine from the external 102. An amount of drug will be delivered in the wound 101. Therefore, it is possible to reduce the burden on the patient, to reduce the size of the device, to suppress the risk of infectious diseases, and to further provide an easy and efficient supply of the drug. Can be provided.

[Second Embodiment]
(Overall configuration of the bone extension device)
Next, a bone extension device 2 according to a second embodiment of the present invention will be described. In the following description, configurations different from those of the first embodiment will be described, and configurations similar to those of the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted as appropriate. 6 and 7 are views showing a state in which the bone extension device 2 according to the second embodiment is applied to the femur 103 as in the first embodiment, and FIG. 6 corresponds to FIG. FIG. 7 is a schematic cross-sectional view corresponding to FIG.

  As shown in FIGS. 1 and 2, the bone extension device 2 expands the distance between the separated bones (104, 105) and the separated bones (like the bone extension device 1 of the first embodiment). 104, 105) and used to extend the femur 103 by growing bone tissue while generating a callus 106, which is a new bone. The bone extension device 2 includes a pump 41 disposed in the wound 101, a liquid reservoir 12, an extender 13, and tubes (14, 23). In the bone extension device 2, the liquid reservoir 12, the extension device 13, and the tubes (14, 23) are configured in the same manner as in the first embodiment, but the configuration of the pump 41 is different from that in the first embodiment. Different configurations are provided. Further, since the configuration of the pump 41 is different, the mode of operation of the bone extension device 2 is also operated by the pressing device 109 instead of the magnetic force generation device 107, unlike the first embodiment.

(Pump configuration)
8 and 9 are cross-sectional views for explaining the configuration and operation of the pump 41, and are cross-sectional views corresponding to FIGS. 3 and 5 of the first embodiment. The pump 41 is arranged in the wound 101 like the pump 11 of the first embodiment, but is driven by a pressing force acting from outside the wound by a pressing device 109 (see FIGS. 6 and 7). By operating the pump 41, the liquid stored in the liquid reservoir 12 is sucked through the tube 14 and further supplied to the hydraulic chamber 20 of the extender 13 through the tube 23. As shown in FIGS. 8 and 9, the pump 41 includes a main body block 24, a plunger unit 42, a case 43, a coil spring 44, and the like. Moreover, in the pump 41, the 1st check valve 30 and the 2nd check valve 31 are incorporated similarly to the pump 11 of 1st Embodiment, and the inflow part 32 and the outflow part 33 are provided.

  The pump 41 having the above-described configuration is different from the pump 11 of the first embodiment in the configuration of the plunger unit 42, the case 43, and the coil spring 44. As shown in FIGS. 8 and 9, the plunger unit 42 includes a plunger 27 and a plunger base member 45. The plunger 27 is formed in the same shape as that of the first embodiment, and is arranged in a reciprocating manner in the plunger chamber 34 and is accompanied by a force (pressing force) acting from a pressing device 109 located on the external 102. A reciprocating movement is made between the approach position (the position shown in FIG. 9) that has entered the jar chamber 34 to the far side and the protruding position (the position shown in FIG. 8) that protrudes greatly from the plunger chamber 34 toward the case 43. Arranged to do. In addition, the operation | movement relationship in the plunger 27, the plunger chamber 34, the 1st check valve 30, and the 2nd check valve 31 is the same as that of 1st Embodiment.

  As shown in FIGS. 8 and 9, the plunger base member 45 is disposed in a region partitioned between the case 43 and the main body block 24. And the plunger base member 45 is formed, for example with stainless steel etc., and the one end side of the plunger 27 is being fixed to the center part. The plunger base member 45 is disposed so as to be movable toward and away from the main body block 24, and reciprocates in the case 43 by a pressing force acting from a pressing device 109 located on the exterior 102. Are arranged as follows.

  The plunger base member 45 is formed with a through hole 37, a convex portion 46, and a spring support hole 47. For example, clean air is sealed in the case 43. Further, the convex portion 46 is formed as a raised portion in the plunger base member 45 so as to protrude in a hemispherical shape on the side where the plunger 27 protrudes. The spring support hole 47 is formed in the plunger base member 45 so as to open to the top of the raised portion of the convex portion 46. A coil spring 44 is disposed in the spring support hole 47. The main body block 24 is formed with a hemispherical concave portion 39 that is recessed at a position corresponding to the convex portion 46, as in the first embodiment. In the present embodiment, an example in which the convex portions 46 and the concave portions 39 arranged so as to face each other is illustrated, but even if such convex portions 46 and concave portions 39 are not formed. For example, the shape where flat parts oppose may be sufficient.

  The case 43 is formed in a box shape with a wide opening formed on one side, and is formed of a material (for example, silicon rubber) that can be elastically deformed by a pressing force acting from the external wound 102. As shown in FIGS. 8 and 9, the case 43 is attached to the main body block 24 at the edge portion forming the opening, and the inner space forms an area in which the plunger base member 45 moves. Yes.

  The coil spring 44 constitutes a second spring member in the present embodiment. As shown in FIGS. 8 and 9, the coil spring 44 is disposed between the plunger base member 45 and the main body block 24 in a state of being disposed in the spring support hole 47 of the plunger base member 45. Thus, the coil spring 44 is disposed so as to bias the plunger base member 45 from the main body block 24 toward the case 43.

  In the pump 41 configured as described above, the pressure receiving area of the plunger chamber 34 in the moving direction of the plunger 27 is larger than the pressure receiving area of the hydraulic chamber 20 in the extending direction of the connecting unit 17, as in the first embodiment. It is set to be smaller.

(Operation of bone extension device)
In the bone extension device 2 described above, as in the first embodiment, the first fixing portion 15 and the second fixing portion 16 of the extender 13 are respectively connected to the separated bones (104, 105) in the femur 103. Fixed, the pump 41, the liquid reservoir 12, and the tubes (14, 23) are also placed in the wound 101 (see FIGS. 6 and 7). The pump 41 is arranged in the wound 101 so that the case 43 is positioned closer to the skin 100 than the plunger base member 45. The bone extension device 2 is operated by the pressing device 109 in a state where the operation in which all the components are arranged in the wound 101 is completed and the wound 101 and the wound 102 are blocked through the skin 100. Will be.

  6 and 7, the pressing device 109 includes a casing 113, a motor 110 arranged in the casing 113, a gear mechanism (not shown) connected to the motor 110, and a link connected to the gear mechanism. The mechanism 111 includes a pressing portion 112 that is connected to the link mechanism 111 and protrudes from the casing 113. In the pressing device 109, when the motor 110 is driven by power supplied from a power source (not shown), the rotation operation of the motor 110 is converted into a reciprocating operation via the gear mechanism and the link mechanism 111, and the pressing unit 112 is reciprocated. It is configured as a driven device. Then, the pressing device 109 is arranged so that the pressing portion 112 can come into contact with the skin 100, and the pressing device 109 is operated in this state to reciprocate the pressing portion 112 so that the pressing force is applied from the external 102. As a result, the pump 41 is driven and the bone distraction device 2 is operated.

  When the pressing device 109 is not in operation (when the pressing unit 112 is not reciprocating), the pump 41 is in the state shown in FIG. That is, in the pump 41, the plunger base member 45 is urged from the main body block 24 toward the case 43 by the spring force of the coil spring 44, and the plunger base member 45 is separated from the main body block 24 in the case 43. It moves to the position which approaches or contacts. At this time, the plunger 27 is located at a protruding position protruding from the plunger chamber 34. At this time, the first check valve 30 and the second check valve 31 are closed, and the liquid in the liquid reservoir 12 is not supplied to the extension device 13.

  From the state described above, the pressing device 109 is disposed in the vicinity of the skin 100 in the vicinity of the pump 41 on the external wound 102, and further, the pressing device 109 is activated and the pressing portion 112 protrudes from the casing 113. When driven and pressed against the skin 100, the pressing force from the wound 102 acts and the pump 41 is driven. When the pressing force from the pressing portion 112 acts on the pump 41 from the case 43 side, the case 43 is deformed so as to be crushed and the plunger base member 45 resists the spring force of the coil spring 44 as shown in FIG. As a result, it moves in a direction approaching the main body block 24. Then, the plunger 27 fixed together with the plunger base member 45 moves to the entry position shown in FIG. 9 along the plunger chamber 34, the liquid in the plunger chamber 34 is pushed out, and the discharge operation is performed. It will be. When the discharge operation by the plunger 27 is performed, the second check valve 31 is opened, and the liquid in the plunger chamber 34 passes through the outflow portion 33 (not shown in FIGS. 8 and 9) and the tube 23. It is supplied to the hydraulic chamber 20 of the extender 13. At this time, the first check valve 30 is kept closed.

  When the pressing force from the pressing portion 112 of the pressing device 109 is applied and the discharge operation by the plunger 27 is finished, the pressing device 112 is then driven in the direction in which the pressing portion 112 returns toward the casing 113 as the motor 110 is operated. Thus, the pressing force is released. As a result, the pressing force does not act on the pump 41 from the external wound 102, and the plunger base member 45 moves in a direction away from the main body block 24 by the spring force of the coil spring 44. Then, together with the plunger base member 45, the plunger 27 moves along the plunger chamber 34 to the protruding position shown in FIG. 8, and the suction operation is performed. When the suction operation by the plunger 27 is performed, the first check valve 30 is opened, and the liquid stored in the liquid reservoir 12 flows into the plunger chamber 34 through the tube 14 and the inflow portion 32. become. At this time, the second check valve 31 is kept closed.

  As described above, the pump 41 is driven by the pressing force acting from the external 102 so that the liquid stored in the liquid reservoir 12 passes through the pump 41 and is supplied to the hydraulic chamber 20 of the extender 13. . When the liquid is supplied to the hydraulic pressure chamber 20, the hydraulic pressure chamber 20 expands and the cylinder 18 moves relative to the rod 19 to extend the connecting unit 17 (see FIGS. 6 and 7). . Thereby, the space | interval of the 1st fixing | fixed part 15 to which the one end side of the rod 19 was attached, and the 2nd fixing | fixed part 16 to which the cylinder 18 was fixed is expanded, and the 1st fixing | fixed part 15 and the 2nd fixing | fixed part 16 are each fixed. The distance between the separated bones (104, 105) will be extended.

  Since the pump 41 is small and has a small discharge amount per time, the reciprocating operation of the pressing portion 112 in the pressing device 109 is repeatedly performed, and the driving operation of the pump 41 described above is repeatedly performed a desired number of times. The amount of elongation of is appropriately adjusted. Then, a new bone tissue is generated between the bones (104, 105) whose distance is extended, and the callus 106 grows. In this way, the femur 103 is extended. In the above-described driving operation of the pump 41, the operation of repeating the reciprocating operation of the pressing unit 112 in the pressing device 109 is exemplified, but this need not be the case. For example, the pump 41 may be operated by applying a pressing force by using another device or by directly pressing the skin 100 with a hand or a finger.

(Effect of bone extension device)
According to the second embodiment described above, as with the bone extension device 1 of the first embodiment, the burden on the patient can be reduced, the device can be reduced in size, and the risk of occurrence of infectious diseases is suppressed. A bone extension device 1 that can be provided can be provided.

  Further, according to the bone extension device 2, the plunger base member 45 is constantly urged toward the case 43 by the coil spring 44 disposed between the plunger base member 45 and the main body block 24. The case 43 is formed to be elastically deformable by a pressing force acting from the wound exterior 102. For this reason, the plunger base member 45 moves against the spring force of the coil spring 44 along with the deformation of the case 43 when a pressing force is applied from the external 102, while the spring of the coil spring 44 is released when the pressing force is released. It moves so as to return to the position before the pressing force is applied by the force. As a result, the pump 41 is driven. By placing the pump 41 in the wound 101 so that the case 43 is positioned closer to the skin 100 than the plunger base member 45, the pressing force from the wound 102 can be stabilized more efficiently. It can be transmitted to the pump 41. Therefore, a mechanism that efficiently controls stable driving of the small pump 41 can be easily realized by a simple mechanism in which the coil spring 44 is disposed at a predetermined position and the case 43 can be elastically deformed.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims of the utility model registration. is there. For example, the following modifications can be implemented.

(1) In 1st Embodiment, although the case where the magnetic force which acts from the outside acts as an attractive force with respect to a plunger base member was demonstrated as an example, it does not necessarily need to be this way. The magnetic force acting on the plunger base member from the outside acts as a repulsive force acting in the direction in which the outside magnet and the plunger base member inside the wound repel each other, and drives the pump. There may be.

(2) In the first embodiment, the example in which the plunger base member is made of a magnetic material has been described as an example. However, the plunger base member itself may be made of a magnet. In the case where the plunger base member is formed of a magnet, if the pump is arranged in the wound so that the case is located closer to the skin than the plunger base member, the plunger base member magnet side Other magnets (permanent magnets and electromagnets) from the outside to the skin in the vicinity where the pump is placed so that the skin is approached with a pole different from the pole existing on the side (the pole on the side facing the case) The drive of the pump can be operated by applying a magnetic force. That is, by applying a magnetic force to the pump from outside the wound through the skin with the operating magnet, the plunger base member moves in a direction in which the magnets attract each other against the spring force of the first spring member, The pump will be driven. Therefore, it is possible to easily realize a mechanism capable of driving the pump by a simple operation in which a magnetic force is applied from the outside with the predetermined pole facing the skin. Furthermore, by forming the main body block with a material having very weak magnetism, it is possible to prevent the movement of the plunger base member from being disturbed by the magnetic force acting between the main body block and the plunger base member.

(3) In the first and second embodiments, the case where the connecting unit of the extender is configured to include a cylinder and a rod has been described as an example, but this need not be the case. For example, the connection unit may be configured using a bellows structure.

(4) In the first and second embodiments, the first fixing part and the second fixing part of the extender are illustrated in the drawings so as to be spread flat, but this is the case. For example, it may be formed so as to have a cross section that curves along the circumference of the bone. FIG. 10 is a view schematically showing a cross section of the first fixing portion or the second fixing portion 48 according to the modification together with a cross section of the bone 114. Note that FIG. 10 also shows a cross section of the guide portion 49 that restricts the relative movement direction of the first fixing portion with respect to the second fixing portion. As shown in FIG. 10, the first fixing portion or the second fixing portion 48 may be formed to be curved along the periphery of the bone 114. Thereby, the space | interval of the vicinity of the bone 114 can be utilized efficiently, and the 1st fixing | fixed part and 2nd fixing | fixed part which have sufficient intensity | strength can be arrange | positioned compactly, and a smaller and high-strength extender is realized. Can do.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied as a bone extension device that extends a bone by expanding a bone tissue between the separated bones while expanding the interval between the separated bones.

It is a perspective view showing the state where this bone extension device was applied to the human body about the bone extension device concerning a 1st embodiment of the present invention. It is a cross-sectional schematic diagram of the bone extension apparatus shown in FIG. It is sectional drawing of the pump in the bone extension apparatus shown in FIG. It is sectional drawing of the pump in the bone extension apparatus shown in FIG. It is sectional drawing of the pump in the bone extension apparatus shown in FIG. It is a perspective view which shows the state by which this bone extension apparatus was applied with respect to the human body about the bone extension apparatus which concerns on 2nd Embodiment of this invention. It is a cross-sectional schematic diagram of the bone extension apparatus shown in FIG. It is sectional drawing of the pump in the bone extension apparatus shown in FIG. It is sectional drawing of the pump in the bone extension apparatus shown in FIG. It is the figure which showed typically the cross section of the 1st fixing | fixed part which concerns on a modification, and the 2nd fixing | fixed part with the cross section of a bone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bone extension apparatus 11 Pump 12 Liquid reservoir 13 Extender 15 1st fixing | fixed part 16 2nd fixing | fixed part 100 Skin 101 Wound 102 Wound 102, 105 Separated bone

Claims (10)

A bone extension device that expands bone by expanding the distance between separated bones and growing bone tissue between the separated bones,
A pump that is placed in the wound that is inside the skin and that is driven by a force acting from outside the skin that is outside the skin;
A liquid reservoir disposed within the wound for storing liquid and communicating with the pump and supplying the liquid as the pump is operated;
A first fixing portion and a second fixing portion that are respectively fixed to one bone and the other bone of the separated bone, and the liquid is supplied from the pump; An extender for enlarging the distance between the second fixed parts;
A bone extension device comprising: The bone extension device according to claim 1,
The pump has a plunger that reciprocates in accordance with a force acting from outside the wound, and a plunger chamber in which the plunger is reciprocally disposed so that liquid from the liquid reservoir passes through the plunger chamber.
The extender has a hydraulic chamber to which liquid from the pump is supplied, and is connected to the first fixed portion and the second fixed portion to supply liquid to the hydraulic chamber. A connecting unit that extends in the direction of enlarging the interval between the first fixing portion and the second fixing portion;
The bone extension device, wherein a pressure receiving area of the plunger chamber in a moving direction of the plunger is smaller than a pressure receiving area of the hydraulic chamber in an extending direction of the connecting unit. The bone extension device according to claim 2,
The extender further includes a guide portion that is connected to the first fixing portion and the second fixing portion and restricts a relative movement direction of the first fixing portion with respect to the second fixing portion. Bone extension device. The bone extension device according to claim 2 or 3,
The pump is
A body block in which the plunger chamber is formed;
A plunger unit having the plunger and a plunger base member that moves in a direction in which the plunger is fixed and moves toward and away from the main body block;
A case attached to the main body block and forming a region in which the plunger base member moves;
A bone extension device comprising: The bone extension device according to claim 4,
The bone extension device, wherein the plunger base member reciprocates in the case by a magnetic force acting from outside the wound. The bone extension device according to claim 5,
The pump includes a first spring member that is disposed between the plunger base member and the case and biases the plunger base member from the case toward the main body block. A bone extension device. The bone extension device according to claim 6,
The bone extension device, wherein the plunger base member is made of a magnetic material. The bone extension device according to claim 6,
The bone extension device, wherein the plunger base member is formed of a magnet. The bone extension device according to claim 4,
The pump includes a second spring member that is disposed between the plunger base member and the main body block and biases the plunger base member from the main body block toward the case.
The bone extension device, wherein the case is formed to be elastically deformable by a pressing force acting from outside the wound. The bone extension device according to any one of claims 2 to 9,
The connection unit includes a cylinder in which the hydraulic chamber is formed, and a direction in which the interval between the first fixing portion and the second fixing portion is increased by supplying liquid to the hydraulic chamber. A rod protruding from the cylinder,
In the cylinder, a medicine chamber is formed which is partitioned at the end of the rod together with the hydraulic chamber, and stores a medicine,
When the liquid from the pump is supplied to the hydraulic chamber, the hydraulic chamber expands and the rod protrudes from the cylinder, and the drug stored in the drug chamber is discharged from the cylinder. A bone extension device characterized by that.

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