CN113749846B

CN113749846B - Ophthalmic implants Implantation devices

Info

Publication number: CN113749846B
Application number: CN202010500344.4A
Authority: CN
Inventors: 王晓俊
Original assignee: Optalmopro LLC
Current assignee: Optalmopro LLC
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2025-05-13
Anticipated expiration: 2040-06-04
Also published as: CN113749846A

Abstract

The invention provides an ophthalmic implant implantation device which has a relatively simple structure and can realize two operation modes of pushing-in push injection and screwing-in push injection, wherein a switching mechanism (10) comprises a switching action part (14) which is fixedly arranged on a push injection cylinder (1), extends along the axial direction of the push injection cylinder (1) and is provided with a threaded matching part (14 a), a switching switch (4) which is rotatably arranged on the push injection cylinder (1) and is provided with a guide surface extending towards one direction in the circumferential direction and towards the outer circumferential side, and when an operator rotates the switching switch (4), the guide surface pushes the switching action part (14) in the inner circumferential-outer circumferential direction, so that the switching action part (14) is flexibly deformed, and the threaded matching part (14 a) moves in the inner circumferential-outer circumferential direction.

Description

Ophthalmic implant implantation device

Technical Field

The present invention relates to medical devices, and more particularly to an ophthalmic implant implantation device, such as an intraocular lens implantation device.

Background

Cataract is one of eye diseases with highest blindness rate worldwide, and no effective medicine can inhibit the cataract until now. Surgery is currently the only effective treatment that enables patients to recover vision. In cataract surgery, a turbid natural lens is widely removed by phacoemulsification, and then an intraocular lens is implanted in the eye to replace the original lens, so that an external object is focused and imaged on the retina, and the effect of recovering the vision can be achieved. Intraocular lenses are special lenses made of synthetic materials, typically composed of a central circular optic and peripheral haptics, and flexible intraocular lenses made of flexible materials such as silicone elastomer, hydrogel, soft acrylic, etc. are folded or rolled to reduce their area and then inserted into the eye through a small incision (typically 2-3 mm), also often referred to as a foldable intraocular lens, which is automatically unfolded after entering the eye.

In order to successfully implant these foldable intraocular lenses into the eye, various specialized implant devices have been developed, which are operable to be divided into push-in type and screw-in type. The surgeon typically selects different modes of operation of the implant device based on personal usage habits.

The push-in type implanting device has the characteristics that a doctor clamps the implanting device by means of an index finger and a middle finger, applies a force to a push rod by using a thumb, the front end of the push rod contacts with the intraocular lens in an inner cavity channel of the implanting device, the force is conducted to the intraocular lens, and the intraocular lens overcomes the resistance of friction and the like between the intraocular lens and the inner cavity channel, moves forwards along the axis of the inner cavity channel until the intraocular lens is completely pushed out of the implanted human eye. The operation of the push-in type implanting device needs to keep the balance between the operating pressure of the push rod and the resistance of the intraocular lens to ensure that the intraocular lens moves forward at a uniform speed as much as possible, and the push injection of the intraocular lens is controlled by largely relying on the operating hand feeling of doctors, so that the operating difficulty is high and the operation is unstable for novices or doctors unfamiliar with products. Typically the cross-sectional area of the lumen at the tip of the implant (at the exit of the intraocular lens) is minimal, the intraocular lens is subjected to the greatest resistance at this location, and the operating pressure is the greatest, and when the intraocular lens is suddenly pushed into the eye, the resistance is momentarily lost, and both the pushed-out intraocular lens and the implant may cause damage to the ocular tissue. The push-in type implant device has high requirements on the precision of component machining, the stability and the reliability of movement.

The screw-in type implanting device has the characteristics that in general, the implanting device main body and the driving part have an internal and external thread matching relationship, and the driving part is rotated to drive the push pin in the implanting device to move forwards along the axis of the implanting device main body, so that the resistance such as friction between the intraocular lens and an inner cavity channel is overcome, and the intraocular lens is pushed out to be implanted into a human eye. The screw-in type implanting device is easier to control the moving speed and the moving amount of the intraocular lens, and even when the intraocular lens passes through the outlet, the intraocular lens is not suddenly released into the eye, so that the safety is high. But screw-in implant devices must be operated with both hands.

At present, in order to meet market demands, two kinds of implantation devices of push-in type and screw-in type need to be developed simultaneously, and the device is processed through injection mold, and injection mold is high in cost, long in processing period and needs to input great manpower, material resources and financial resources. If one artificial lens implantation device can realize two operation modes of pushing and rotating, the two operation modes can be switched at any time, the number of the dies can be effectively reduced, the cost of the dies is reduced, the development period of the product is shortened, and meanwhile, the production management and the sales are facilitated.

For example, patent document 1 discloses a push-and-twist integrated intraocular lens implantation device (injector) having a foldable handle, and switching between a push-in operation mode and a screw-in operation mode of an injection driving mechanism is performed by a folding operation of the handle. Patent document 2 also discloses a push-and-twist integrated intraocular lens implantation device in which a movable ball is engaged with and disengaged from a spiral groove, thereby switching between a push-in operation mode and a screw-in operation mode.

However, the above prior art has the following problems:

One is that the structure is relatively complex. That is, in patent document 1, a link mechanism is provided in the implant device housing 1, and a foldable handle is movable by the link mechanism to a position where it can be engaged with a screw on a push rod of a bolus drive mechanism and a position where it can be separated from the position. The provision of such a link mechanism makes the structure complicated and the manufacturing cost high. In addition, in patent document 2, since it is necessary to provide balls, grooves for holding the balls, and the like, the structure is complicated, parts are more, the installation is troublesome, and the manufacturing cost is high.

< Prior art document >

Patent document 1 wo 2019195959551 a1

Patent document 2, CN101815484B

Disclosure of Invention

Accordingly, it is an object of the present invention to provide an ophthalmic implant device that is relatively simple in structure and that can be used to achieve both a push-in mode of operation and a screw-in mode of operation.

In order to achieve the above object, an ophthalmic implant implanting device according to the present invention includes a push cylinder and a push rod which is operated by an operator and moves along an axis of the push cylinder and has a screw portion, the push rod having a push operation mode in which the push rod is pushed by the operator to move and a screw operation mode in which the push rod is rotated by the operator to move, the ophthalmic implant implanting device further includes a switching mechanism for switching the push operation mode and the screw operation mode, the switching mechanism includes a switching operation portion fixedly provided on the push cylinder and having a screw engagement portion, and a switching switch rotatably mounted on the push cylinder and having a guide surface extending to an outer circumferential side in one direction in a circumferential direction, and when the switching switch is rotated by the operator, the guide surface pushes the switching operation portion in an inner circumferential-outer circumferential direction to flexibly deform the switching operation portion to move the screw engagement portion in the inner circumferential-outer circumferential direction.

The screw portion in the present application refers to a portion having a spiral groove or a spiral protrusion so as to be capable of converting a rotational motion into a linear motion.

In the present application, "circumferential direction" means a circumferential direction around an axis of the bolus tube, and "inner circumferential-outer circumferential direction" means a direction approaching to and separating from the axis, and may be regarded as a radial direction around the axis.

With the above configuration, since the screw engagement portion is moved in the inner peripheral-outer peripheral direction by the flexible deformation of the switching operation portion, the switching between the push-in operation mode and the screw-in operation mode can be achieved by only the guide surface and the switching operation portion, and therefore, the present invention can provide an ophthalmic implant device capable of achieving both the push-in operation mode and the screw-in operation mode with a simple structure and at a low manufacturing cost.

In the present invention, it is preferable that the guide surface includes an outer guide surface that presses the switching portion from the outer peripheral side and/or an inner guide surface that presses the switching portion from the inner peripheral side.

With the above configuration, when the guide surface includes the outer guide surface and the inner guide surface, the switching operation portion is pushed and guided by the inner and outer guide surfaces, so that the operation reliability of the switching operation portion can be improved, and for example, a switching failure due to a shortage of restoring force of the switching operation portion when only the inner guide surface and the outer guide surface are provided can be avoided.

In the present invention, the change-over switch preferably has a tubular peripheral wall portion and a bottom portion located at one end in an axial direction of the peripheral wall portion, and a guide groove extending in a circumferential direction is provided in the bottom portion, and the guide surface is formed by an inner peripheral side wall surface or an outer peripheral side wall surface of the guide groove.

In the present invention, the guide surface is preferably arc-shaped not concentric with the axis.

In the present invention, the switching operation portion is preferably integrally formed with the bolus tube. Therefore, the structure is simple, and the parts are prevented from being lost during assembly.

In the present invention, preferably, the changeover portion is provided on a rear end surface of the bolus tube, and the changeover switch is mounted on a rear end portion of the bolus tube.

In this way, the bolus tube can be formed more easily and the change-over switch can be mounted more easily than in a configuration in which the change-over operation section and the change-over switch are provided in the middle of the bolus tube.

In the present invention, the changeover portion preferably includes a main body portion extending in an axial direction of the bolus tube and a tip portion provided at an end portion of the tablet main body portion, the screw engagement portion is formed at the tip portion, and the flexible deformation is performed by the main body portion.

In the present invention, the main body portion preferably extends obliquely inward from the bolus tube in one direction in the axial direction, and the tip end portion preferably extends parallel to the axial direction.

In this way, the conversion operation portion can be easily deformed flexibly.

In the present invention, it is preferable that a locking groove is provided in the middle of the guide surface, and a locking rib capable of locking with the locking groove is provided in the switching operation part.

By adopting the structure, the position movement of the change-over switch can be avoided through the clamping of the clamping groove and the clamping rib.

In the present invention, it is preferable that a stopper surface capable of abutting the switching portion in the circumferential direction is provided at an end portion of the guide groove in the circumferential direction.

In this way, the rotation operation range of the change-over switch can be defined with a simple structure.

Drawings

FIG. 1 is an exploded view of an intraocular lens injector device according to an embodiment;

Fig. 2 is an oblique view of the rear end portion of the cartridge, wherein (a) is an oblique view of the rear end portion of the cartridge, and (b) is a partial enlarged view at a in (a);

fig. 3 is a drawing for showing the internal structure of the change-over switch, in which (a) is an oblique view of the change-over switch, (B) is a partial enlarged view at B in (a), and (c) is an oblique view at another angle;

FIG. 4 is a cross-sectional view of the transfer switch after installation with the bolus;

FIG. 5 is an oblique view of a slider;

FIG. 6 is an oblique view of the front end of the pushrod;

FIG. 7 is a drawing for showing the connection structure of the push rod and the slider;

fig. 8 is a drawing for showing the structure of the slider, in which (a) is a side view of the slider and (b) is a partially enlarged view of the elastic tongue piece in (a);

FIG. 9 is a schematic view showing a mounting structure of a slider and a bolus cylinder;

fig. 10 is a schematic view for showing a structure in the vicinity of the rear end portion of the bolus tube;

FIG. 11 is a schematic diagram for illustrating a method of operation of injecting a viscoelastic agent into an implant head;

FIG. 12 is a schematic diagram showing a method of operation for inserting an intraocular lens into an implant head;

FIG. 13 is a schematic diagram illustrating a method of operation for folding over the posterior optic of an intraocular lens;

FIG. 14 is a schematic diagram showing a method of operation for pushing an intraocular lens to a marking location within an implant head;

Fig. 15 is a schematic view for showing an operation method of mounting an implant head on a bolus tube, wherein (a) is a state before mounting and (b) is a state after mounting;

fig. 16 is a schematic diagram for illustrating a method of operation for switching the mode of operation of the intraocular lens implantation device.

The reference numerals are 100, an intraocular lens implantation device, 1, a push-injection tube, 11, a tube body, 11a, a limit groove (limit groove 1), 11c, a limit groove (limit groove 2), 111, an implantation head mounting portion, 12, a handle, 13, a switch mounting portion, 14, a switch operating portion, 141, a tablet main portion (main portion), 142, a tablet tip portion (tip portion), 14a, a screw fitting portion, 14b, a detent rib, 2, a core bar, 21, a push rod, 21a, a screw portion, 21b, a swivel connector, 21b1, a spindle portion, 21b2, a limit head, 21c, a push-rotation operating head, 22, a slider, 22a, a push rod connecting portion, 22a1, a spindle receiving portion, 22a2, an opening portion, 22a3, a locking groove, 22b, an elastic tongue piece, 22b1, a tongue piece main portion, 22b2, a protrusion, 22b21, a slope portion, 22b, a vertical face portion, 23, a needle, 3, a spring, 4, a switch, 41, a peripheral wall, a switch, 42b, a guide surface 40a, and a guide groove 40c, and a guide groove 5.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the vertical and longitudinal directions (also indicated in the drawings) are defined, but these directions are set for convenience of description and do not necessarily limit the present invention.

<1. Summary >

As shown in fig. 1, an intraocular lens implantation device 100 mainly comprises a push cylinder 1, a stem 2 (a push rod 21 with a threaded portion, a push pin 23, and a slider 22 connecting the two), a spring 3, a change-over switch 4, and an implantation head 5. By operating the change-over switch 4, the push-in operation mode of the intraocular lens implantation device 100 can be switched between a push-in operation mode in which the operator can push the plunger 21 of the stem 2 in the direction of the axis X of the plunger 1 (forward-backward direction, direction of pushing) to move it forward and backward, and a screw-in operation mode in which the operator can rotate the plunger 21 about the axis X of the plunger 1 to move the plunger 21 forward and backward. By forward movement of the push rod 21, the slider 22 and the push pin 23 are driven to move forward, and the push pin 23 moved forward implants the intraocular lens 400 (fig. 12, 13, etc.) into the human eye via the implantation head 5.

In addition, the intraocular lens implantation device 100 of the present embodiment is constructed without the intraocular lens 400, and before the operation, it is necessary for the operator (doctor) to mount the intraocular lens 400 in the implantation head 5, then mount the implantation head 5 on the push cylinder 1, and then perform the implantation operation. However, a preloaded intraocular lens implant device (also referred to as a preloaded intraocular lens by some, depending on the convention) comprising an intraocular lens 400 may also be constructed.

The main structural elements of the intraocular lens implantation device 100 will be described below. In the following description, each component is described in an attached state (in particular, a description about the direction) unless otherwise specified.

< 2> Main constituent elements

<2.1, Bolus tube >

As shown in fig. 1 and 9, the bolus tube 1 has a cylindrical body 11 made of plastic (polymer material), the cylindrical body 11 is cylindrical and has both ends open, an implant head mounting portion 111 is formed at the front end of the cylindrical body 11, the implant head 5 can be mounted thereon, and a change-over switch mounting portion 13 is formed at the rear end of the cylindrical body 11, and the change-over switch 4 can be mounted thereon. A limit groove 11a (1 st limit groove) and a limit groove 11c (2 nd limit groove) located behind the limit groove 11a are provided in the peripheral wall (specifically, the lower portion) of the cylindrical body 11. The limiting groove 11a is formed in a long groove shape extending in the front-rear direction, and is used for preventing the core rod 2 from retreating to the movement initial position after the movement is finished. The limit groove 11c is used to prevent the slider 22 (or the core rod 2) from falling off the plunger 1.

The outer peripheral surface of the barrel 11 is provided with a handle 12 extending outward, the handle 12 having a portion located at the upper side of the barrel 11 and a portion located at the lower side of the barrel 11, and when performing the pushing operation, the operator usually pulls the index finger and the middle finger on the portions located at the upper side and the lower side of the barrel 11 of the handle 12, respectively, and pushes the push rod 21 with the thumb to move the stem 2 forward in the pushing direction.

As shown in fig. 2 and 10, the change-over switch mounting portion 13 is integrally formed at the rear end portion of the cylindrical body 11 and is located rearward of the handle 12. The switch mounting portion 13 includes a flange portion 13a and a fixing groove 13b, the flange portion 13a protruding toward the outer peripheral side with respect to the outer peripheral surface of the other portion of the tubular body 11, and the fixing groove 13b is formed between the flange portion 13a and the rear end surface 12a of the handle 12. A notch portion 13c is provided on the outer peripheral surface of the flange portion 13a, and is configured to allow an engagement projection 42a of the switch 4 to be described later to pass therethrough and enter the fixing groove 13b at the time of assembly. In the present embodiment, the number of the notch portions 13c is two, and the two are separated by an angle of 180 °.

As shown in fig. 2 and 10, two switching parts 14 extending rearward in a claw shape are integrally formed on a rear end surface 11b of the cylinder 11 (also referred to as a rear end surface of the plunger 1). The two conversion operation portions 14 are separated by an angle of 180 °, and each of them has a tablet main body portion 141 (main body portion) and a tablet distal end portion 142 (distal end portion), wherein the tablet main body portion 141 extends obliquely rearward (in one direction in the axis X direction) and inward from the rear end surface 11b of the tubular body portion 11, and the tablet distal end portion 142 extends substantially parallel to the front-rear direction (in the axis X direction). A screw engagement portion 14a is provided on the surface of the tablet distal end portion 142 on the inner peripheral side, and the screw engagement portion 14a is screwed with the screw portion 21a of the push rod 21. In the present embodiment, the screw engagement portions 14a are formed by protrusions, and the screw engagement portions 14a of the two switching operation portions 14 are disposed at different positions in the front-rear direction, specifically, can be set according to the parameter sizes of the screw portions 21a of the push rod 21.

As shown in fig. 2, a locking rib 14b is provided on the surface of the conversion operation portion 14 on the outer peripheral side. The engaging rib 14b engages with an engaging groove 40b1 provided in the outer guide surface 40b, which will be described later.

<2.2, Core rod (push rod, push needle, slider)

As shown in fig. 1 and 9, the core bar 2 is mainly composed of a push pin 23 (corresponding to a push injection part in the present application), a slider 22, and a threaded push rod 21, wherein the push pin 23 is installed at the front of the slider 22, and the push rod 21 is connected at the rear of the slider 22. In addition, the push pin 23 and the slider 22 may be an integral part.

A screw portion 21a is provided on the outer peripheral surface of the push rod 21, and the screw portion 21a is adapted to be screwed into a screw engagement portion 14a (fig. 2) of the switching portion 14 to be described later, so that the push rod 21 can be screwed into operation to move forward. The screw portion 21a may have a single-thread or double-thread structure.

A push-and-turn operation head 21c configured as a large diameter portion is provided at the rear end portion of the push rod 21, and is pushed or rotated by an operator.

As shown in fig. 6, a rotary joint 21b is provided at the front end of the push rod 21, and is connected to the slider 22. The rotary joint 21b includes a shaft portion 21b1 and a stopper 21b2 provided in front of the shaft portion 21b1 and having a larger diameter than the shaft portion 21b1 to form a large diameter portion.

As shown in fig. 5, a push rod connection portion 22a is provided at the rear end portion of the slider (piston) 22, and the push rod connection portion 22a includes a rotation shaft accommodating portion 22a1, an opening portion 22a2, and a locking groove 22a3. The shaft accommodating portion 22a1 is formed of a through hole opened in the rear end surface of the slider 22, and accommodates the shaft portion 21b1 of the swivel joint 21 b. The locking groove 22a3 is formed by a groove formed in a side surface of the slider 22, and is a U-shaped groove having an arc surface on a bottom surface and a flat side wall, wherein the flat surface is in tangential transition with the arc surface. The locking groove 22a3 is located in front of the shaft accommodating portion 22a1 and its inner space communicates with the inner space of the shaft accommodating portion 22a 1. The locking groove 22a3 is for accommodating the stopper head 21b2 of the swivel joint 21b, and its size corresponds to the stopper head 21b2, so that the distance between the two planar side walls is larger than the diameter of the shaft accommodating portion 22a1, and the locking groove 22a3 and the shaft accommodating portion 22a1 form a stepped hole as a whole. The opening 22a2 is provided on the side of the shaft housing 22a1, and opens the side of the shaft housing 22a 1. At the time of assembly, the shaft portion 21b1 of the rotary joint 21b is expanded by elastically deforming the opening portion 22a2 so as to be able to enter the shaft accommodating portion 22a1 through the opening portion 22a 2.

As shown in fig. 7, 9, and 10, the rotary joint 21b of the push rod 21 is engaged with the push rod connecting portion 22a so as to be rotatable but not movable forward and backward (particularly, backward). Thus, the push rod 21 can rotate relative to the slider 22, but cannot move back and forth.

As shown in fig. 5 and 8, an elastic tongue piece 22b is provided below the slider 22, and in an initial state in which no operation is performed, the elastic tongue piece 22b engages with a stopper groove 11c in the cylinder 11. When the operator moves the slider 22 forward from the initial state, the elastic tongue piece 22b can engage with the stopper groove 11a on the cylinder 11.

As shown in fig. 8, the elastic tongue piece 22b is configured to be elastically deformable to move up and down, and has a tongue piece main body portion 22b1 extending in the front-rear direction and a projection 22b2 projecting downward from the tongue piece main body portion 22b 1. The protrusion 22b2 can be engaged with the stopper groove 11a or the stopper groove 11 c. The front surface of the projection 22b2 is configured as a slope portion 22b21 inclined downward and rearward, and the rear surface is configured as a vertical face portion 22b22 vertical to the front-rear direction. In this way, when the protrusion 22b2 is engaged with the stopper groove 11a and the stopper groove 11c, it is not possible to move backward and separate from the stopper groove 11a and the stopper groove 11c, but it is possible to move forward and separate from the stopper groove 11a and the stopper groove 11c by elastic deformation.

In this way, when the elastic tongue piece 22b engages with the limit groove 11c, the slider 22 (core bar 2) can be prevented from being detached from the plunger 1, and when the elastic tongue piece 22b engages with the limit groove 11a, the slider 22 (core bar 2) can be prevented from being retracted to the initial position when not operated.

As shown in fig. 1 and 9, the push pin 23 (push member) has an elongated rod shape, is fixedly connected to the front end of the slider 22, and extends forward from the slider 22. The tip of the push pin 23 is formed in a predetermined shape, and is used to push the intraocular lens 400 and to push it into the human eye through the implantation head 5.

<2.3, Spring >

As shown in fig. 2, a spring 3 is provided in the cylinder 11, and the spring 3 is located between the front of the cylinder 11 and the slider 22. The spring 3 is compressed by the core rod 2 moving forward, so that the core rod 2 can retract under the action of the spring 3 at any time in the pushing-in operation mode, and the defect that the retracting operation cannot be performed in the pushing-in operation mode is overcome.

<2.4, Change-over switch >

As shown in fig. 3, 4, and 10, the switch 4 has a bowl shape with a hole at the bottom, and includes a bottom 41 and a peripheral wall 42, wherein the peripheral wall 42 has a tubular shape, the switch operating portion 14 is accommodated therein, the bottom 41 is located at one end of the peripheral wall 42 in the axial direction, and a through center hole 43 is formed in the bottom 41. The inner wall of the bottom 41 is provided with two guide grooves 40a extending in the circumferential direction, and the guide grooves 40a have an outer guide surface 40b as an outer circumferential side wall surface and an inner guide surface 40c as an inner circumferential side wall surface, the outer guide surface 40b and the inner guide surface 40c are formed in an arc shape, and the center of the arc is different from the center position of the center hole 43. Specifically, the outer guide surface 40b and the inner guide surface 40c are formed to extend toward the outer peripheral side in one direction (clockwise in fig. 3 and 4) in the circumferential direction (centered on the center hole 43). Alternatively, the outer guide surface 40b and the inner guide surface 40c are formed in a spiral shape expanding toward the outer peripheral side.

The rear end of the tablet distal end portion 142 of the switching portion 14 is fitted into the guide groove 40a from the front, and the inner peripheral surface and the outer peripheral surface thereof can be brought into contact with the inner guide surface 40c and the outer guide surface 40b of the guide groove 40a, respectively.

When the change-over switch 4 is rotated clockwise in fig. 4, the change-over switch 4 is rotated about the center hole 43 (and also about the axis X of the cylindrical body 11), and at this time, the outer guide surface 40b presses the changeover operation portion 14 toward the inner peripheral side to move the tablet distal end portion 142 toward the center side (inner peripheral side), so that the screw engagement portion 14a provided on the tablet distal end portion 142 reaches a position where it can be screwed (screw engaged) with the screw portion 21a of the push rod 21, and the intraocular lens implantation device 100 is changed into the screwing operation mode.

Conversely, when the change-over switch 4 is rotated counterclockwise in fig. 4, the change-over switch 4 rotates about the center hole 43 (and also about the axis of the cylindrical body 11), and at this time, the inner guide surface 40c presses the changeover operation portion 14 toward the outer peripheral side, and moves the tablet distal end portion 142 away from the center side (outer peripheral side), so that the screw engagement portion 14a reaches a position where it is impossible to screw (screw engagement) with the screw portion 21a of the push rod 21, and the intraocular lens implantation device 100 is changed to the push operation mode. Fig. 4 shows a state in which the screw engagement portion 14a is located at a position where it cannot be screwed (screw-engaged) with the screw portion 21a of the push rod 21.

In this way, the changeover switch 4 and the changeover operation unit 14 mainly constitute the changeover mechanism 10 for switching the operation modes.

When the tablet distal end portion 142 moves in the inner peripheral-outer peripheral direction, the conversion operation portion 14 (mainly the tablet main body portion 141) is deformed flexibly.

As shown in fig. 3, a locking groove 40b1 is provided in the middle of the outer guide surface 40b, and when the operator rotates the changeover switch 4 counterclockwise to switch the intraocular lens implantation device 100 into the screwing operation mode, the locking rib 14b on the switching operation part 14 is engaged with the locking groove 40b1, so that the changeover switch 4 can be prevented from returning to the position in the pushing operation mode when the operator leaves the changeover switch 4 by hand.

As shown in fig. 3 and 4, the guide groove 40a has stop surfaces 40d1 and 40d2 as wall surfaces at circumferential ends thereof, that is, contact of the stop surfaces with side surfaces of the tablet distal end portion 142 of the conversion action portion 14 defines a maximum operable range (rotation angle range) of the rotation operation of the conversion switch 4. In addition, a stopper surface may be provided at one end portion in the circumferential direction of the guide groove 40 a.

As shown in fig. 3, an engagement projection 42a protruding toward the inner peripheral side is provided on the edge of the inner peripheral surface of the peripheral wall portion 42 of the change-over switch 4 on the side away from the bottom portion 41, and the engagement projection 42a is elastically deformed to pass over the notch portion 13c and enter and engage in the fixing groove 13b at the time of assembly, whereby the change-over switch 4 is mounted on the barrel portion 11 of the bolus tube 1.

< 3> Method of operating intraocular lens implantation device

The operation method of the intraocular lens implantation device 100 having the above structure will be described below with reference to fig. 11 to 16.

First, as shown in fig. 11, an appropriate amount of viscoelastic agent is injected into the implant head 5 so that the viscoelastic agent fills the entire inner cavity of the implant head 5. Thereafter, as shown in fig. 12, the edge of the optic portion of the intraocular lens 400 is grasped by forceps 300 and gently placed into the rear of the implant head 5. As shown in fig. 13 and 14, posterior haptic 401 of intraocular lens 400 is folded over the anterior surface of the optic of intraocular lens 400 and pushed forward, pushing intraocular lens 400 to the indicated location in implant head 5. Then, as shown in fig. 15, the implant head 5 is mounted on the bolus tube 1 so that the implant head 5 is completely engaged into the positioning groove on the bolus tube 1. As shown in fig. 16, the operator rotates the changeover switch 4 as necessary to change over the push-in operation mode and the screw-in operation mode of the push rod 21, and then implants the intraocular lens 400 into the eye through the surgical incision.

<4 > Summary of the embodiment

According to the present embodiment, the following can be obtained:

The ophthalmic implant implanting device 100 includes a push rod 21 having a screw portion 21a and being moved along the axis of the push rod 1 by being operated by an operator, the push rod 21 having a push operation mode in which the push rod is pushed to move by the operator and a screw operation mode in which the push rod is rotated to move by the operator, the ophthalmic implant implanting device 100 further includes a switching mechanism 10 for switching between the push operation mode and the screw operation mode, the switching mechanism 10 includes a switching operation portion 14 fixedly provided on the push rod 1 and extending in the axial direction of the push rod 1 and having a screw engagement portion 14a, and a switching switch 4 rotatably mounted on the push rod 1 and having a guide surface (an outer guide surface 40b and/or an inner guide surface 40 c) extending to the outer peripheral side in one direction in the circumferential direction, and when the switching switch 4 is rotated by the operator, the guide surface pushes the switching operation portion 14 in the inner peripheral direction to flexibly deform the switching operation portion 14 so that the screw engagement portion 14a moves in the inner peripheral direction.

In this way, the push-in operation mode and the screw-in operation mode can be switched by only the guide surface and the switching operation part 14, so that the structure is simple and the manufacturing cost is low.

In the present embodiment, the guide surfaces include an outer guide surface 40b and an inner guide surface 40c, the outer guide surface 40b presses the switching operation portion 14 from the outer peripheral side, and the inner guide surface 40c presses the switching operation portion 14 from the inner Zhou Cetui.

With the above configuration, the switching operation portion 14 is pushed and guided by the inner and outer guide surfaces, so that the operation reliability of the switching operation portion 14 can be improved, and for example, a switching failure due to a shortage of restoring force of the switching operation portion 14 when only the inner guide surface and the outer guide surface are provided can be avoided.

In the present embodiment, the change-over switch 4 includes a tubular peripheral wall portion 42 and a bottom portion 41 located at one end of the peripheral wall portion 42 in the axial direction, and a guide groove 40a extending in the circumferential direction is provided in the bottom portion 41, and the guide surface is constituted by an inner peripheral side wall surface or an outer peripheral side wall surface of the guide groove. The guide surface is formed in an arc shape not concentric with the axis X.

In the present embodiment, the switching unit 14 is integrally formed with the plunger 1. Therefore, the structure is simple, and the parts are prevented from being lost during assembly.

In the present embodiment, the changeover portion 14 is provided on the rear end surface of the plunger 1, and the changeover switch 4 is attached to the rear end portion of the plunger 1. In this way, compared to a configuration in which the changeover operation portion 14 and the changeover switch 4 are provided in the middle portion of the bolus tube 1, the bolus tube 1 can be easily formed, and the changeover switch 4 can be easily attached.

In the present embodiment, the changeover portion 14 includes a tablet body portion 141 (body portion) and a tablet distal end portion 142 (distal end portion), the tablet body portion 141 extending in the axial direction X and being capable of undergoing flexural deformation, the tablet distal end portion 142 being provided at an end portion (extended distal end portion) of the tablet body portion 141, and the screw-fit portion 14a being formed at the tablet distal end portion 142. Further, the tablet main body 141 extends obliquely from the bolus tube 1 toward the inner peripheral side in one direction in the axial direction, and the tablet distal end 142 extends parallel to the axial direction. In this way, the conversion operation portion 14 can be easily deformed flexibly.

In the present embodiment, the guide surface has a locking groove 40b1 at the middle portion thereof, and the switching operation section 14 has a locking rib 14b engageable with the locking groove 40b 1.

With the above configuration, the engagement between the detent groove 40b1 and the detent rib 14b can prevent the change-over switch 4 from moving.

In the present embodiment, stopper surfaces 40d1, 40d2 that can contact the switching operation portion 14 in the circumferential direction are provided at the circumferential end portions of the guide groove 40 a. In this way, the rotation operation range of the changeover switch 4 can be defined with a simple structure.

<5, Modification >

In the above description, the guide groove 40a has the outer guide surface 40b and the inner guide surface 40c, but the present application is not limited to this, and may be provided with only the outer guide surface 40b, for example, in which case, the conversion operation portion 14 is set to a position where the tablet distal end portion 142 is located at a position where the screw engagement portion 14a cannot be screwed with the screw portion 21a in a natural state, and the tablet distal end portion 142 is pushed to the inner peripheral side by the outer guide surface 40b, and at this time, the conversion operation portion 14 is elastically deformed, and the tablet distal end portion 142 moves to the inner peripheral side to a position where the screw engagement portion 14a can be screwed with the screw portion 21 a. Thereafter, the changeover switch 4 is rotated reversely to release the pressing of the outer guide surface 40b against the pressing piece distal end portion 142, and at this time, the elastic deformation of the changeover operation portion 14 is restored to restore the pressing piece distal end portion 142. As a result, it is possible to realize the movement of the tablet distal end portion 142 to the non-rotatable position by pushing the inner guide surface 40c only with the inner guide surface 40c, and the movement to the rotatable position by the elastic restoring force of the switching operation portion 14.

In the above description, the guide groove 40a is a bottomed groove, but the present application is not limited to this, and for example, the guide groove 40a may be formed to penetrate the bottom 41 of the change-over switch 4.

In the above description, the guide groove 40a is provided in the bottom portion 41 of the change-over switch 4, but the present application is not limited to this, and may be provided in other places, or the change-over switch 4 may be shaped not only in a bowl shape but also in other shapes.

In the above description, the outer guide surface 40b and the inner guide surface 40c are circular arc-shaped, but the present application is not limited to this, and may be formed in other shapes, for example, parabolic or involute, as long as they extend toward the outer peripheral side (or expand toward the outer peripheral side) in one direction in the circumferential direction.

In the above embodiment, the switching unit 14 is provided in two, but the number thereof is not limited to this, and may be, for example, 4 or another number.

In the above embodiment, the switching unit 14 is integrally formed with the cylindrical body 11, but the present invention is not limited to this, and the switching unit 14 may be independently formed and fixed to the cylindrical body 11.

In the above embodiment, the present invention has been described by way of example as applied to the intraocular lens implantation device 100, however, the present invention is also applicable to other ophthalmic implant implantation devices.

In the above embodiment, the conversion operation portion 14 extends along the axis X direction, but the present invention is not limited to this, and may be configured to extend along the circumferential direction.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. An ophthalmic implant implantation device, comprising a push rod (1) and a push rod (21) which is operated by an operator to move along the axis (X) of a barrel portion (11) of the push rod (1) and has a threaded portion (21a), wherein the push rod (21) has a push-in operation mode in which the push rod is moved by the operator and a screw-in operation mode in which the push rod is moved by the operator, and the ophthalmic implant implantation device further comprises a switching mechanism (10) for switching between the push-in operation mode and the screw-in operation mode, characterized in that:

The switching mechanism (10) comprises:

A conversion action portion (14), which is fixedly arranged on the injection cylinder (1) and has a threaded matching portion (14a);

The changeover switch (4) is mounted on the injection cylinder (1) in a manner that allows it to rotate around the axis (X) of the cylinder body (11), and has a guide surface extending toward the outer peripheral side in one direction in the circumferential direction.

When the operator rotates the conversion switch (4), the guide surface pushes the conversion action part (14) in the inner circumference-outer circumference direction, causing the conversion action part (14) to be flexibly deformed, thereby causing the threaded fitting part (14a) to move in the inner circumference-outer circumference direction, wherein the guide surface is in the shape of an arc that is not concentric with the axis, the conversion action part (14) is integrally formed on the injection cylinder (1), the conversion action part (14) is arranged on the rear end surface of the injection cylinder (1), the conversion switch (4) is installed at the rear end of the injection cylinder (1), the conversion action part (14) includes a main body extending along the axial direction of the injection cylinder (1) and a top end portion arranged at the end of the main body, the threaded fitting part (14a) is formed on the top end portion, and the flexural deformation is performed by the main body.

2. The ophthalmic implant implanting device according to claim 1 is characterized in that the guide surface includes an outer guide surface (40b) and/or an inner guide surface (40c), the outer guide surface (40b) pushes the conversion action part (14) from the outer peripheral side, and the inner guide surface (40c) pushes the conversion action part (14) from the inner peripheral side.

3. The ophthalmic implant implantation device according to claim 1, characterized in that:

The switching switch (4) comprises a cylindrical peripheral wall portion (42) and a bottom portion (41) located at one end of the peripheral wall portion (42) in the axial direction.

A guide groove (40a) extending in the circumferential direction is provided on the bottom (41), and the guide surface is formed by the inner circumferential side wall surface or the outer circumferential side wall surface of the guide groove.

4. The ophthalmic implant implantation device according to claim 1, characterized in that:

The main body portion extends from the injection cylinder (1) in a direction in the axial direction toward the inner peripheral side, and the top end portion extends parallel to the axial direction.

5. The ophthalmic implant implantation device according to any one of claims 1 to 3, characterized in that:

A locking groove (40b1) is provided in the middle of the guide surface, and a locking rib (14b) capable of locking with the locking groove (40b1) is provided on the conversion action portion (14).

6. The ophthalmic implant implantation device according to claim 3, characterized in that:

Stop surfaces (40d1, 40d2) capable of abutting against the switching action portion (14) in the circumferential direction are provided at the circumferential ends of the guide groove (40a).