JP2005329078A - Puncture needle device for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely prevent the distal end of a needle tube from projecting from the distal end of a sheath when the distal end of the sheath is still in the middle of an insertion channel, and to effectively protect the insertion channel of an endoscope. <P>SOLUTION: A lock pipe 61 and a lock ring 62 are stored inside a control part body 41 of a puncture needle device 30, and a slider pipe 63 is stored inside a slider 42. The lock pipe 61 can be moved forward/backward inside the control part body 41, always energized toward a connection part 52, with the distal end slightly projecting from the connection part 52. When a treatment instrument insertion port 15 and the connection part 52 are fixed to each other, the distal end of the lock pipe 61 abuts on the treatment instrument insertion port 15, pressed movably toward the proximal end side, and inserted while expanding the diameter of the lock ring 62. The lock ring 62 has a small-diameter part 62c, when the lock ring 62 is in a normal state without being expanded in diameter, the distal end of the slider pipe 63 abuts on the small-diameter part 62c and the movement of the slider pipe 63 toward the connection part 52 is restrained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In particular, the present invention relates to an endoscope puncture needle device that is inserted into a treatment instrument channel of an ultrasonic endoscope and fixed to a channel inlet.

  Conventionally, in order to examine and diagnose the affected part in the body cavity, while observing the inside of the body cavity with an ultrasonic endoscope, the deep part of the pancreas, liver, kidney, etc. from the digestive tract wall of the stomach or duodenum using a puncture needle device A puncture needle is punctured at a target site of an organ to collect tissue and body fluid in a body cavity.

As a puncture needle device used for such an ultrasonic endoscope, for example, in Japanese Patent Application Laid-Open No. 2003-190179, a sheath inserted through an insertion channel of an ultrasonic endoscope so as to freely advance and retract, and a proximal end portion of the sheath There is disclosed a puncture needle device for an ultrasonic endoscope that includes an operation unit that also serves as a gripping part and a needle tube that is inserted through a sheath and punctured into a body cavity tissue.
JP 2003-190179 A

  By the way, in the puncture needle device disclosed in Patent Document 1 described above, when the puncture needle is inserted into the insertion channel of the endoscope, the distal end of the sheath is prevented from being damaged by the tip of the needle tube. After confirming that the needle protrudes from the distal end of the endoscope, the needle tube is protruded from the sheath and used.

  However, before the sheath tip protrudes from the endoscope tip, that is, when the sheath tip is still in the middle of the insertion channel, the needle tube is caused to protrude from the sheath tip in the case where confirmation by the user is insufficient. This may damage the insertion channel of the endoscope.

  The present invention has been made in view of the above circumstances, and reliably prevents the distal end of the needle tube from protruding from the distal end of the sheath when the distal end of the sheath is still halfway through the insertion channel. An object of the present invention is to provide an endoscopic puncture needle device that can be protected.

  The present invention provides a sheath that is inserted into a channel provided in an endoscope, an operation unit main body that can be fixed to a channel inlet portion of the channel and supports a proximal end portion of the sheath, and a forward and backward movement with respect to the operation unit main body. A movable slider, a needle tube that is fixed to the slider and the tip of the slider can be protruded and retracted from the distal end of the sheath by movement of the slider relative to the operating portion main body, and the operating portion main body is connected to the channel inlet. And a movement restriction releasing means for allowing the slider to move toward the channel inlet when the distal end of the needle tube protrudes from the distal end of the sheath.

  The puncture needle device for an endoscope according to the present invention reliably prevents the tip of the needle tube from protruding from the sheath tip when the sheath tip is still in the middle of the insertion channel, and effectively uses the insertion channel of the endoscope. It becomes possible to protect.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 9 show a first embodiment of the present invention, FIG. 1 is a schematic configuration diagram of an ultrasonic endoscope to which a puncture needle device is attached, and FIG. 2 is a configuration of a distal end portion of the ultrasonic endoscope. FIG. 3 is a cross-sectional view illustrating the entire configuration of the puncture needle device, FIG. 4 is an explanatory view of a state before the puncture needle device is fixed to the channel inlet of the ultrasonic endoscope, and FIG. FIG. 6 is an explanatory diagram of a state in which the needle device is fixed to the channel inlet of the ultrasonic endoscope, FIG. 6 is an explanatory diagram of a state in which the puncture needle device is fixed to the channel inlet of the ultrasonic endoscope and the needle tube protrudes. FIG. 8 is a perspective view of the lock ring in a state where the diameter is not expanded, FIG. 8 is a perspective view of the lock ring in a state where the diameter is expanded, and FIG. 9 is a perspective view of the lock release adapter.

  In FIG. 1, reference numeral 1 denotes an ultrasonic endoscope. The ultrasonic endoscope 1 is an elongated and flexible insertion portion 2 that is inserted into a body cavity, and is positioned at the proximal end of the insertion portion 2. An operation unit 3, a universal cord 4 extending from the side of the operation unit 3, an endoscope connector 5 provided at a proximal end portion of the universal cord 4 and connected to a light source device (not shown), and an endoscope connector An ultrasonic cable 6 extending from the vicinity of 5 and an ultrasonic connector 7 provided at a proximal end portion of the ultrasonic cable 6 and connected to an ultrasonic observation device (not shown) are mainly configured.

  The insertion portion 2 is located at the distal end of the bending portion 9, the distal end rigid portion 8 formed of a hard resin member, the bendable bending portion 9 located at the rear end of the distal end hard portion 8, in order from the distal end side. In other words, a flexible portion 10 having a small diameter, a long length, and flexibility reaching the distal end portion of the operation portion 3 is continuously provided. In addition, as a material of the distal end hard portion 8, polysulfone, polyphenylsulfone or the like having good chemical resistance and biocompatibility is used.

  The operation unit 3 includes an angle knob 11 for controlling the bending of the bending portion 9 in a desired direction, an air / water supply button 12 for performing air supply and water supply operations, and a suction button 13 for performing a suction operation. Is provided.

  In addition, a treatment instrument insertion port 15 as a channel inlet for inserting a treatment instrument such as a forceps or a puncture needle device 30 into a target site in a body cavity is provided on the distal end side of the operation unit 3. A treatment instrument insertion channel 16 (see FIG. 2) is formed in the insertion portion 2 from the treatment instrument insertion port 15.

  A treatment instrument such as a puncture needle device 30 inserted through the treatment instrument insertion channel 16 via the treatment instrument insertion port 15 is a treatment instrument insertion channel 16 provided in the distal end hard portion 8 as shown in FIG. It protrudes from the front end opening 18 formed in the front end opening wall 17.

  A forceps raising base 19 is swingably provided in the vicinity of the distal end opening 18 of the treatment instrument insertion channel 16 and can be operated by a forceps raising lever (not shown) provided in the operation section 3. . By operating the forceps raising lever, the forceps raising base 19 swings and a treatment tool such as a puncture needle device 30 for sucking tissue protruding from the distal end opening 18 is moved within an ultrasonic scanning plane α described later. .

  As shown in FIG. 2, on the distal end side of the distal end hard portion 8, a convex ultrasonic transducer 20 configured by arranging a plurality of piezoelectric elements (not shown) for transmitting and receiving ultrasonic waves is disposed at the distal end hard portion. 8 is detachably connected, and has an ultrasonic scanning surface α having a scanning range of about 180 degrees, for example, in a fan-shaped range parallel to the longitudinal axis direction of the insertion portion 2 and indicated by an arrow. .

  This ultrasonic scanning range is set up to the vicinity of the distal end opening 18 of the treatment instrument insertion channel 16, but is set so that the distal end hard portion 8 is not included in this ultrasonic scanning range. Further, the vicinity of the distal end opening 18 of the treatment instrument insertion channel 16 is formed such that the central axis of the treatment instrument insertion channel 16 is included in the extended surface of the ultrasonic scanning plane α.

  The distal end slope portion 21 of the distal end rigid portion 8 is provided with an illumination lens cover 22 constituting an illumination optical system, an observation lens cover 23 constituting an observation optical system, and an air / water feed nozzle 24.

  On the other hand, as shown in FIG. 4, the treatment instrument insertion port 15 is provided with a screw thread 25 for fixing the puncture needle device 30 on the distal end side. A female screw 52a provided in a connecting portion 52, which will be described later, of the puncture needle device 30 is cut out so as to be freely screwed.

  As shown in FIG. 3, the puncture needle device 30 includes a sheath 31 inserted into the treatment instrument insertion channel 16, and an operation unit 32 that is disposed at the proximal end of the sheath 31 and also serves as a gripping unit, The distal end portion, which is inserted and disposed in the sheath 31 through the operation portion 32 so as to be able to advance and retreat, is mainly composed of an elongated and thin needle tube 33 formed of, for example, a stainless steel pipe. A stylet 34 having a sharp tip is removably disposed in the needle tube 33.

  Moreover, the puncture needle device 30 of the present embodiment is configured as a disposable type. For this reason, the sheath 31 is formed of a resin member such as polyethersulfone or Teflon (registered trademark) that can reduce the cost. Polyethersulfone and Teflon (registered trademark) can be used properly according to the application.

  The operation unit 32 is mainly composed of an operation unit main body 41 formed of a resin member and a slider 42 formed of a resin member slidably provided with respect to the operation unit main body 41.

  The operation part main body 41 has a long and narrow pipe shape in which a flange part 51 is formed at the base end part, and a resin connection part 52 is fixed to the distal end part by bonding. On the distal end side of the connecting portion 52, as described above, a double thread 52a that is connected and fixed to the screw thread 25 of the treatment instrument insertion port 15 of the ultrasonic endoscope 1 is formed. A recessed portion 52b into which the distal end portion of the operation portion main body 41 is inserted is formed.

  Further, the operation unit main body 41 is provided with a stopper 53 that can set the sliding distance of the slider 42 with respect to the operation unit main body 41 to a desired value according to the measurement result. The stopper 53 is slidably disposed with respect to the operation portion main body 41. For example, a stopper member 53a made of resin and screwed to the stopper member 53a to fix the stopper member 53a at a desired position, for example, metal It is comprised with the fixing screw 53b made from.

  At the time of manufacture and shipment, the stopper 53 is positioned on the proximal end side of the operation unit main body 41 and is fixed with a predetermined torque by a fixing screw 53b. Therefore, the slider 42 is disposed on the proximal end side of the operation unit main body 41. In this arrangement state, the distal ends of the needle tube 33 and the stylet 34 are arranged in the sheath 31 without protruding from the distal end of the sheath 31.

  In addition, the predetermined position on the outer peripheral surface of the operation unit main body 41 is a guide for setting a sliding groove that serves as a guide for sliding the stopper 53 in the longitudinal direction, and an arrangement position of the stopper 53 (for example, Scales (not shown) with 5 mm intervals are provided.

  Further, the sheath 31 is inserted into the treatment instrument insertion channel 16 of the ultrasonic endoscope 1, the distal end of the sheath 31 is projected from the distal end opening 18 of the treatment instrument insertion channel 16, and the connection portion 52 of the operation unit main body 41 is connected. When the puncture needle device 30 is fixed by being fixed to the treatment instrument insertion port 15, the fixing screw 53b is loosened, the stopper 53 is slid to a desired position, and the fixing screw 53b is fixed again. Thereby, the slider 42 can be moved by the length of the distance to which the stopper 53 is moved, and the needle tube 33 and the stylet 34 can be protruded from the distal end of the sheath 31.

  The slider 42 is formed in a stepped pipe shape in which a narrow diameter portion 42a is formed at the base end portion, and a plurality of concave portions 42b are formed at predetermined positions on the outer peripheral surface of the slider 42 in consideration of gripping properties. .

  A sliding cap 54 is attached and fixed to the tip of the slider 42 so that the slider 42 can slide with respect to the operation unit main body 41. In addition, a suction cap member 55 made of resin is disposed in the opening on the base end side of the slider 42. At the base end portion of the suction base member 55, a connecting portion to a resin stylet base member 56 fixed to the base end of the stylet 34 is formed. The stylet base member 56 is a suction base member. It is configured to be detachably attached to 55 connecting portions.

  The operation unit 32 of the puncture needle device 30 configured as described above includes a movement restriction releasing means for freely moving the slider 42 that projects the distal end of the needle tube 33 from the distal end of the sheath 31 toward the treatment instrument insertion port 15. Is configured.

  That is, a long lock pipe 61 as a first pipe member and a lock ring 62 as a deformation member are stored in the operation unit main body 41, and a second pipe member as a second pipe member is stored in the slider 42. A long slider pipe 63 is stored.

  The lock pipe 61 is provided so as to freely advance and retreat within the operation portion main body 41, and is always connected via a flange 61 a formed in the middle of the lock pipe 61 by a coil spring 64 stored in the operation portion main body 41. It is biased toward the part 52 side. Thus, the distal end portion of the lock pipe 61 slightly protrudes from the connection portion 52. When the treatment instrument insertion port 15 and the connection portion 52 are screwed together and fixed, the distal end of the lock pipe 61 comes into contact with the treatment instrument insertion port 15 and is pressed to be movable toward the proximal end side. It has become.

  A thin cylindrical connecting member 65 for fixing the proximal end portion of the sheath 31 is fixed to the distal end of the lock pipe 61.

  The base end portion of the lock pipe 61 is gradually formed with a taper portion 61b that becomes a warp, and can be fitted inside the tip end of the lock ring 62 while expanding the diameter of the lock ring 62.

  As shown in FIGS. 7 and 8, the lock ring 62 is formed with a plurality of (three in the present embodiment) vertical slits 62a from the distal end side (the lock pipe 61 side), and the lock ring 62 is fitted therein. The diameter can be easily expanded. A tapered portion 62b corresponding to the tapered portion 61b of the lock pipe 61 is formed at a portion where the lock pipe 61 is fitted while expanding the diameter of the lock ring 62, and the tapered portions 61b and 62b slide. The surface is formed so as to be slippery.

  Further, a diameter-reduced portion 62c is formed at a position slightly closer to the center of the lock ring 62. When the lock ring 62 is not normally expanded, the diameter of the slider pipe 63 is increased to the diameter-reduced portion 62c. The slider pipe 63 is formed so as to be restricted from moving in the direction of the connecting portion 52. Then, the lock pipe 61 is brought into contact with the treatment instrument insertion port 15, the lock pipe 61 is moved to the maximum proximal end side, and the diameter of the lock ring 62 is increased to the maximum, and the slider pipe 63 is reduced in diameter 62 c. Therefore, the slider pipe 63 can pass through the lock ring 62.

  The slider pipe 63 is integrally provided outside the needle tube 33 at the distal end portion of the suction cap member 55, and the distal end side is supported via an O-ring 57 disposed on the proximal end side of the operation portion main body 41. Yes.

  The puncture needle device 30 configured as described above is sterilized and sterilized after assembling the constituent members and stored in a sterilization bag (not shown). In this stored state, since the stopper 53 is disposed on the proximal end side of the operation portion main body 41 which is the initial position, the distal end of the needle tube 33 or the stylet 34 protrudes from the distal end of the sheath 31 and a defect occurs in the sterilization bag. This is prevented.

The operation of the disposable puncture needle device 30 configured as described above will be described.
First, the puncture needle device 30 stored in the sterilization bag is taken out. Then, the sheath 31 is inserted into the treatment instrument insertion channel 16 of the ultrasonic endoscope 1, the connection portion 52 of the operation section main body 41 is screwed into the treatment instrument insertion opening 15, and the operation section main body 41 is inserted into the treatment instrument insertion opening. Secure to 15. FIG. 4 shows an internal state of the puncture needle device 30 immediately before the operation unit main body 41 is connected to the treatment instrument insertion port 15.

  With this fixing, as shown in FIG. 5, the treatment instrument insertion port 15 is brought into contact with the distal end of the lock pipe 61 and further presses the lock pipe 61 to move the lock pipe 61 to the proximal end side. Then, the proximal end side of the lock pipe 61 is fitted with the tapered portion 61 b inside the distal end of the lock ring 62 while increasing the diameter of the lock ring 62. The diameter of the reduced diameter portion 62c of the lock ring 62 is increased to a diameter sufficient to allow the slider pipe 63 to pass therethrough in the vicinity of the position where the connection between the operation portion main body 41 and the treatment instrument insertion port 15 is completed. Thus, the movement restriction of the slider pipe 63 is released.

  In addition, before the lock pipe 61 is moved, that is, as shown in FIG. 4, the treatment instrument insertion port 15 and the connection portion 52 of the operation portion main body 41 are not connected, or the connection is insufficient. In FIG. 5, the diameter-reduced portion 62c of the lock ring 62 is in a state where the diameter is not expanded or the diameter expansion is a small value. For this reason, even if the slider 42 receives a force that moves toward the tip end, the slider pipe 63 is restricted from moving toward the operation portion main body 41 by the reduced diameter portion 62 c of the lock ring 62, and thus moves together with the slider 42. The tips of the needle tube 33 and the stylet 34 do not protrude from the tip of the sheath 31. Therefore, when the distal end of the sheath 31 is still in the middle of the treatment instrument insertion channel 16 of the ultrasonic endoscope 1, it is reliably prevented that the distal end of the needle tube 33 protrudes from the distal end of the sheath 31. One treatment instrument insertion channel 16 can be effectively protected.

  Thus, when the connection portion 52 of the operation portion main body 41 is screwed and the operation portion main body 41 is securely fixed to the treatment instrument insertion port 15, the distal end portion of the sheath 31 is displayed on the ultrasonic observation image displaying the target site. Ultrasonic images are clearly depicted. Here, the positional relationship between the distal end of the sheath 31 and the target site is set, and then the distance between the distal end of the sheath 31 and the target site is measured.

  Next, the fixing screw 53b of the stopper 53 is loosened, and the stopper member 53a is slid on the operation portion main body 41 with reference to the scale provided on the outer peripheral surface of the operation portion main body 41 so as to correspond to the distance. If it moves to the predetermined position, the fixing screw 53b is fastened again.

  Thereafter, the surgeon grasps the slider 42 and quickly moves the slider 42 toward the stopper 53. The state inside the puncture needle device 30 at this time is shown in FIG. This ensures that the tips of the needle tube 33 and the stylet 34 are punctured into the target site.

  After confirming that the needle tube 33 has reached the target site, the stylet 34 is pulled out from the suction base member 55 together with the stylet base member 56, and then a syringe (not shown) is connected to the connecting portion of the suction base member 55. Then, the tissue in the body cavity is aspirated.

By this suction, the tissue in the body cavity enters the needle tube 33.
Thereafter, the slider 42 is slid again to the proximal end side of the operation unit main body 41, the needle tube 33 is accommodated in the sheath 31, and the connection portion 52 between the treatment instrument insertion port 15 of the ultrasonic endoscope 1 and the puncture needle device 30. And the sheath 31 is withdrawn from the treatment instrument insertion channel 16 of the ultrasonic endoscope 1. Then, the tissue in the body cavity sucked into the needle tube 33 is taken out to a preparation or the like and examined to achieve biopsy of the deep tissue site. After this examination is completed, the puncture needle device 30 is discarded.

  When the tissue in the body cavity sucked into the needle tube 33 is taken out to a preparation or the like, and the operation of the puncture needle device 30 is checked, there is a case where the tip of the needle tube 33 is intended to protrude from the tip of the sheath 31 in some cases.

  For this reason, for example, an adapter 70 as adapter means as shown in FIG. 9 is prepared.

  That is, the adapter 70 is formed in a shape substantially the same as the shape of the treatment instrument insertion port 15, and a screw thread 71 for fixing the connection portion 52 of the puncture needle device 30 is provided on the distal end side. The opposing side surfaces of the thread 71 are cut out so that the female screw 52a provided in the connecting portion 52 of the puncture needle device 30 can be screwed together.

  The adapter 70 is provided with a slit 72 in the vertical direction so that the needle tube 33 can be accommodated from the side. Further, the adapter 70 is provided with a handle 73 on the proximal end side in order to improve the convenience for the surgeon.

  Therefore, by using this adapter 70, for example, suction into the needle tube 33 is possible even when the treatment instrument insertion port 15 of the ultrasonic endoscope 1 and the connection portion 52 of the puncture needle device 30 are not connected. When taking out the tissue in the body cavity into a preparation or the like, or when checking the operation of the puncture needle device 30, the tip of the needle tube 33 can be protruded from the tip of the sheath 31, and the convenience can be greatly improved. ing.

  Next, FIG. 10 is a configuration explanatory view of the movement restriction releasing means according to the second embodiment of the present invention. Note that the second embodiment is different from the first embodiment only in the movement restriction canceling means, and the description of the other parts will be given the same reference numerals for the same components, or the description will be omitted.

  That is, a long lock pipe 81 as a first pipe member and a lock ring 82 as a rotating member are stored in the operation unit main body 41, and a second pipe member is stored in the slider 42. The long slider pipe 83 is stored.

  The lock pipe 81 is provided so as to freely advance and retreat within the operation portion main body 41 and is always connected via a collar portion 81 a formed in the middle of the lock pipe 81 by a coil spring 64 stored in the operation portion main body 41. It is biased toward the part 52 side. Thus, the distal end portion of the lock pipe 81 slightly protrudes from the connection portion 52. When the treatment instrument insertion port 15 and the connection portion 52 are screwed together and fixed, the distal end of the lock pipe 81 comes into contact with the treatment instrument insertion port 15 and is pressed to be movable toward the proximal end side. It has become.

  The lock pipe 81 is disposed such that its rotation is restricted in the operation unit main body 41. Further, the inner diameter of the lock pipe 81 is formed to be larger than the outer diameter of the lock ring 82, and the lock pipe 81 is moved to the proximal end side due to the connection between the treatment instrument insertion port 15 and the connection portion 52. 81 is freely insertable with respect to the lock ring 82.

  Further, a cam pin 81b is projected from the base end portion of the lock pipe 81 at a preset position inward. The cam pin 81 b is configured to be slidable in a cam groove 82 a formed on the outer surface of the lock ring 82.

  The lock ring 82 is formed with an insertion hole 82b through which a substantially elliptical slider pipe 83 is inserted in the center. The initial position of the cam groove 82a in which the cam pin 81b is located is, for example, the substantially long axis side of the insertion hole 82b. It is formed in the site | part of one side of. The position of the base end side of the cam groove 82a is formed up to a position twisted approximately 90 degrees, that is, a position on one side of the short axis side of the insertion hole 82b.

  Therefore, when the cam pin 81 b is moved by the movement of the lock pipe 81 toward the proximal end accompanying the coupling of the treatment instrument insertion port 15 and the connection portion 52, the lock ring 82 is relatively moved with respect to the lock pipe 81. It will be rotated 90 degrees.

  The slider pipe 83 is integrally provided outside the needle tube 33 at the distal end portion of the suction cap member 55, and the distal end side is supported via an O-ring 57 disposed on the proximal end side of the operation portion main body 41. Yes. The outer shape of the slider pipe 83 is such that the lock ring 82 is moved relative to the lock pipe 81 by the movement of the lock pipe 81 toward the proximal end associated with the connection of the treatment instrument insertion port 15 and the connection portion 52. It is formed in an elliptical shape that can be inserted through the elliptical insertion hole 82b of the lock ring 82 for the first time at the position rotated by the degree of rotation.

  Thus, since the movement restriction releasing means according to the second embodiment is configured, the sheath 31 is inserted into the treatment instrument insertion channel 16 of the ultrasonic endoscope 1, and the operation unit main body is inserted into the treatment instrument insertion port 15. When the connection portion 52 of 41 is screwed and the operation portion main body 41 is securely fixed to the treatment instrument insertion port 15, the treatment instrument insertion port 15 comes into contact with the distal end of the lock pipe 81 and further presses the lock pipe 81. Then, the lock pipe 81 is moved to the base end side.

  Then, due to the movement of the lock pipe 81 toward the base end side of the cam pin 81b, the lock ring 82 is rotated 90 degrees by the shape of the cam groove 82a. By this rotation, the direction of the elliptical insertion hole 82b of the lock ring 82 is also rotated by 90 degrees, and the slider pipe 83 can be moved. Thus, the surgeon moves the slider 42 to the distal end side and performs a desired biopsy.

  In addition, before the lock pipe 81 is moved, that is, in a state where the treatment instrument insertion port 15 and the connection portion 52 of the operation portion main body 41 are not connected or in a state where the connection is insufficient, the lock ring 82 is It has not been rotated. Accordingly, even when the slider 42 receives a force that moves toward the distal end side, the slider pipe 83 abuts against the base end side surface of the lock ring 82 and is restricted from moving toward the operation unit main body 41. The distal ends of the needle tube 33 and the stylet 34 that do not protrude from the distal end of the sheath 31. For this reason, as in the first embodiment, when the distal end of the sheath 31 is still in the middle of the treatment instrument insertion channel 16 of the ultrasonic endoscope 1, it is ensured that the distal end of the needle tube 33 protrudes from the distal end of the sheath 31. Thus, the treatment instrument insertion channel 16 of the ultrasonic endoscope 1 can be effectively protected.

The other constituent actions are the same as in the first embodiment.
In addition, in the puncture new apparatus of each above-mentioned embodiment, although demonstrated by the example of a disposable type, it cannot be overemphasized that it can apply also to the type sterilized after use.

  In each of the above-described embodiments, the new puncture apparatus applied to the ultrasonic endoscope has been described as an example. However, the endoscope is not limited to the ultrasonic endoscope.

1 is a schematic configuration diagram of an ultrasonic endoscope to which a puncture needle device is attached according to a first embodiment of the present invention. The perspective view explaining the structure of the front-end | tip part of an ultrasonic endoscope same as the above. Sectional drawing explaining the whole structure of a puncture needle apparatus same as the above The same as above, Explanatory drawing of the state before fixing a puncture needle apparatus to the channel entrance part of an ultrasonic endoscope The same as above, explanatory drawing of the state which fixed the puncture needle apparatus to the channel entrance part of an ultrasonic endoscope The same as above, Explanatory drawing of the state which fixes a puncture needle apparatus to the channel entrance part of an ultrasonic endoscope, and makes a needle tube protrude Same as above, perspective view of the lock ring in a state where the diameter is not expanded Same as above, perspective view of lock ring in an expanded state Same as above, perspective view of adapter Configuration explanatory diagram of movement restriction releasing means according to the second embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasound endoscope 2 Insertion part 8 Tip hard part 15 Treatment instrument insertion port (channel inlet part)
16 treatment instrument insertion channel 30 puncture needle device 31 sheath 32 operation section 33 needle tube 41 operation section main body 42 slider 52 connection section 53 stopper 61 lock pipe (first pipe member, movement restriction release means)
61b Taper 62 Lock ring (deformation member, movement restriction release means)
62a slit 62b taper portion 62c reduced diameter portion 63 slider pipe (second pipe member, movement restriction releasing means)
64 Coil spring 70 Adapter (Adapter means)
Agent Patent Attorney Susumu Ito

Claims (4)

A sheath that is inserted into a channel provided in the endoscope;
An operation unit main body that can be fixed to the channel inlet of the channel and supports the base end of the sheath;
A slider that can be moved back and forth with respect to the operation unit body;
A needle tube that is fixed to the slider and inserted into the sheath, the tip of which can protrude and retract from the distal end of the sheath by the movement of the slider with respect to the operation unit main body;
A movement restriction releasing means for freely moving the slider toward the channel inlet portion, which projects the tip of the needle tube from the distal end of the sheath when the operation portion main body is fixed to the channel inlet portion; Endoscopic puncture needle device characterized by the above.   The movement restriction releasing means includes a first pipe member that contacts the channel inlet portion and moves in the operation portion main body toward the slider when the operating portion main body is fixed to the channel inlet portion; A deformable member that is deformed by the movement of the first pipe member; and a second pipe member that is fixed to the slider that is movable toward the channel inlet by the deformation of the deformable member. The puncture needle device for an endoscope according to claim 1, wherein the puncture needle device is an endoscope.   The movement restriction releasing means includes a first pipe member that contacts the channel inlet portion and moves in the operation portion main body toward the slider when the operating portion main body is fixed to the channel inlet portion; A rotating member that rotates by the movement of the first pipe member, and a second pipe member fixed to the slider that can move toward the channel inlet by the rotation of the rotating member. The puncture needle device for an endoscope according to claim 1, further comprising: Having adapter means having substantially the same shape as the channel inlet of the channel;
The movement restriction releasing means allows the slider to project the tip of the needle tube from the distal end of the sheath toward the adapter means when the adapter means is fixed to the operation unit main body. The puncture needle device for an endoscope according to any one of claims 1 to 3, wherein the puncture needle device is for endoscopes.

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