Ophthalmic implants Implantation devices

Abstract

The present invention provides an ophthalmic implant implantation device with a relatively simple structure and capable of realizing two operation modes of push-in injection and screw-in injection, wherein a switching mechanism (10) comprises: a switching action part (14), which is fixedly arranged on the injection cylinder (1), extends along the axial direction of the injection cylinder (1), and has a threaded fitting part (14a); a switching switch (4), which is rotatably mounted on the injection cylinder (1), and has a guide surface extending toward the outer peripheral side in one direction in the circumferential direction. When an operator rotates the switching switch (4), the guide surface pushes the switching action part (14) in the inner circumference-outer circumference direction, so that the switching action part (14) is flexibly deformed, thereby causing the threaded fitting part (14a) to move in the inner circumference-outer circumference direction.

Description

Technical Field

[0001] The present invention relates to a medical device, in particular to an ophthalmic implant implantation device, such as an artificial lens implantation device. Background Art

[0002] Cataract is one of the eye diseases with the highest blindness rate in the world, and there is no effective drug to inhibit it. Surgery is currently the only effective treatment method that can restore vision for patients. In cataract surgery, phacoemulsification is widely used to remove the cloudy natural lens, and then an artificial lens is implanted in the eye to replace the original lens, so that external objects can be focused and imaged on the retina, which can achieve the effect of restoring vision. An artificial lens is a special lens made of artificial synthetic materials, usually composed of a circular optical part in the center and a supporting haptic around the periphery. A soft artificial lens made of flexible materials such as silicone elastomers, hydrogels, and soft acrylics can be folded or curled to reduce its area and then implanted into the eye through a smaller incision (usually 2-3 mm). It is often called a foldable artificial lens. This folded or curled artificial lens can automatically unfold after entering the eye.

[0003] In order to successfully implant these foldable artificial lenses into the eye, various special implant devices have been developed clinically. The implant devices can be divided into two types according to the operation mode: push-in type and screw-in type. Surgeons generally choose implant devices with different operation modes according to their personal usage habits.

[0004] The push-in implant device has the following characteristics: the doctor holds the implant device with the index finger and middle finger, and applies a force to the push rod with the thumb. The front end of the push rod contacts the intraocular lens in the cavity of the implant device, and the force is transmitted to the intraocular lens. The intraocular lens overcomes the friction and other resistance between itself and the cavity, and moves forward along the axis of the cavity until it is completely pushed out and implanted into the human eye. The operation of the push-in implant device requires maintaining a balance between the operating pressure of the push rod and the resistance of the intraocular lens to ensure that the intraocular lens moves forward as uniformly as possible. It depends largely on the doctor's operating feel to control the push injection of the intraocular lens. Therefore, for novices or doctors who are not familiar with the product, the operation is difficult and unstable. Usually, the cross-sectional area of ​​the cavity at the top of the implant device (the exit of the intraocular lens) is the smallest, and the resistance of the intraocular lens at this position is the largest, and the operating pressure is also the largest. When the intraocular lens is suddenly pushed into the eye, the resistance disappears instantly, and the pushed-out intraocular lens and the implant device may cause damage to the eye tissue. Push-in implant devices have high requirements on component processing accuracy, movement stability and reliability.

[0005] The screw-in implant device has the following characteristics: Usually, there is an internal and external thread matching relationship between the implant device body and the driving component. Rotating the driving component can drive the push pin inside the implant device to move forward along the axis of the implant device body, overcome the friction and other resistance between the artificial lens and the inner cavity, and push the artificial lens out and implant it into the human eye. The screw-in implant device is relatively easy to control the movement speed and amount of the artificial lens. Even when the artificial lens passes through the exit, it will not cause the artificial lens to be suddenly released into the eye, and it is safer. However, the screw-in implant device must be operated with both hands.

[0006] At present, in order to meet the needs of the market, it is necessary to develop both push-in and screw-in implants. Such devices are made by injection molds, which are expensive and have a long processing cycle, requiring a large investment of manpower, material and financial resources. If an artificial lens implant device can achieve both push and screw operation modes and can be switched at any time, it will effectively reduce the number of molds, reduce mold costs, shorten product development cycles, and also facilitate production management and sales.

[0007] For example, Patent Document 1 discloses a push-and-rotate integrated intraocular lens implant device (injector), which has a foldable handle, and the push-in operation mode and the screw-in operation mode of the injection drive mechanism are switched by the folding action of the handle. In addition, Patent Document 2 also discloses a push-and-rotate integrated intraocular lens implant device, in which a movable ball is engaged and disengaged with a spiral groove to achieve switching between the push-in operation mode and the screw-in operation mode.

[0008] However, the above prior art has the following problems:

[0009] One is that the structure is relatively complex. That is, in Patent Document 1, a linkage mechanism is provided on the implant device housing 1, and the foldable handle can move the threaded plate member to a position that can cooperate with the thread on the push rod of the injection drive mechanism and move away from the position through the linkage mechanism. Since such a linkage mechanism is provided, the structure is complex and the manufacturing cost is high. In addition, in Patent Document 2, it is necessary to provide a ball and a groove for holding the ball, etc., so the structure is relatively complex, there are many parts, the installation is troublesome, and the manufacturing cost is high.

[0010] <Prior Art Literature>

[0011] Patent document 1: WO2019195951A1

[0012] Patent document 2: CN101815484B Summary of the invention

[0013] In view of this, an object of the present invention is to provide an ophthalmic implant implantation device with a relatively simple structure and capable of realizing two operating mode selections: a push-in operating mode and a screw-in operating mode.

[0014] To achieve the above-mentioned purpose, the ophthalmic implant implanting device of the present invention includes a push cylinder and a push rod operated by an operator to move along the axis of the push cylinder and having a threaded portion, the push rod having a pushing operation mode in which the push rod is pushed and moved by the operator and a screwing operation mode in which the push rod is rotated and moved by the operator, the ophthalmic implant implanting device also includes a switching mechanism for switching between the pushing operation mode and the screwing operation mode, the switching mechanism including: a conversion action portion, which is fixedly arranged on the push cylinder and has a threaded fitting portion; a conversion switch, which is rotatably mounted on the push cylinder 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, the guide surface pushes the conversion action portion in the inner circumference-outer circumference direction, causing the conversion action portion to undergo flexural deformation, thereby causing the threaded fitting portion to move in the inner circumference-outer circumference direction.

[0015] The threaded portion in the present application refers to a portion having a spiral groove or a spiral protrusion so as to convert rotational motion into linear motion.

[0016] The "circumferential direction" in the present application refers to the circumferential direction centered on the axis of the injection cylinder, and the "inner-outer peripheral direction" refers to the direction approaching to and away from the axis, which can be regarded as a radial direction centered on the axis.

[0017] With the above structure, the threaded mating part is moved in the inner circumference-outer circumference direction by utilizing the flexible deformation of the conversion action part. Therefore, only the guide surface and the conversion action part are required to realize the conversion between the push-in operation mode and the screw-in operation mode. Therefore, the present invention can provide an ophthalmic implant implantation device that can realize both the push-in operation mode and the screw-in operation mode with a simple structure and a low manufacturing cost.

[0018] In the present invention, preferably, the guide surface includes an outer guide surface and / or an inner guide surface, the outer guide surface pushes the conversion action part from the outer peripheral side, and the inner guide surface pushes the conversion action part from the inner peripheral side.

[0019] By adopting the above structure, when the guide surface includes an outer guide surface and an inner guide surface, the inner and outer guide surfaces push and guide the conversion action part, which can improve the action reliability of the conversion action part and avoid switching failures caused by insufficient restoring force of the conversion action part when only the inner guide surface and the outer guide surface are provided.

[0020] Preferably, the switching switch has a cylindrical peripheral wall portion and a bottom located at one end in the axial direction of the peripheral wall portion, and a guide groove extending in the circumferential direction is provided on the bottom, and the guide surface is composed of the inner peripheral side wall surface or the outer peripheral side wall surface of the guide groove.

[0021] Preferably, in the present invention, the guide surface is in the shape of an arc that is not concentric with the axis.

[0022] In the preferred embodiment of the present invention, the conversion action portion is integrally formed on the injection cylinder, so that the structure can be simplified and the loss of parts during assembly can be avoided.

[0023] Preferably, the switching action portion is arranged on the rear end surface of the injection cylinder, and the switching switch is installed at the rear end portion of the injection cylinder.

[0024] In this way, compared with a structure in which the switching action portion and the switching switch are provided in the middle of the injection cylinder, the injection cylinder can be easily formed and the switching switch can be easily mounted.

[0025] Preferably, the conversion action portion includes a main body portion extending along the axial direction of the injection cylinder and a top end portion provided at the end of the tablet pressing main body portion, the threaded fitting portion is formed on the top end portion, and the flexible deformation is performed by the main body portion.

[0026] In the present invention, the main body portion preferably extends from the injection cylinder in one direction in the axial direction toward the inner peripheral side, and the top end portion extends parallel to the axial direction.

[0027] In this way, the conversion operation portion can be easily flexibly deformed.

[0028] Preferably, in the present invention, a locking groove is provided in the middle of the guide surface, and a locking rib capable of engaging with the locking groove is provided on the conversion action portion.

[0029] With the above structure, the position of the conversion switch can be prevented from shifting by the engagement of the locking groove and the locking rib.

[0030] In the present invention, preferably, a stopper surface capable of abutting against the switching action portion in the circumferential direction is provided at an end portion of the guide groove in the circumferential direction.

[0031] In this way, the rotational operation range of the change-over switch can be limited with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an exploded structural diagram of an intraocular lens implant device involved in a specific implementation manner;

[0033] Figure 2are oblique views of the rear end of the push-in cylinder, wherein (a) is an oblique view of the rear end of the push-in cylinder, and (b) is a partial enlarged view of point A in (a);

[0034] Figure 3 1 is a diagram for illustrating the internal structure of a transfer switch, wherein (a) is an oblique view of the transfer switch, (b) is a partial enlarged view of a portion B in (a), and (c) is an oblique view from another angle;

[0035] Figure 4 It is a cross-sectional view after the conversion switch and the injection cylinder are installed;

[0036] Figure 5 is an oblique view of the slider;

[0037] Figure 6 is an oblique view of the front end of the push rod;

[0038] Figure 7 A diagram for illustrating a connection structure between a push rod and a slider;

[0039] Figure 8 1 is a diagram for illustrating the structure of a slider, wherein (a) is a side view of the slider, and (b) is a partial enlarged view of the elastic tongue in (a);

[0040] Fig. 9 is a schematic diagram for representing the installation structure of the slider and the injection cylinder;

[0041] Fig.10 is a schematic diagram for illustrating the structure near the rear end of the injection cylinder;

[0042] Fig.11 A schematic diagram for illustrating an operation method of injecting a viscoelastic agent into an implant head;

[0043] Fig.12 A schematic diagram for illustrating an operation method of placing an intraocular lens into an implant head;

[0044] Fig.13 is a schematic diagram for illustrating an operation method of folding the rear support portion of an intraocular lens;

[0045] Fig.14 A schematic diagram for illustrating an operation method of pushing an intraocular lens to a marked position in an implant head;

[0046] Fig.15 It is a schematic diagram for illustrating the operation method of installing the implant head on the injection cylinder, wherein (a) is a state before installation, and (b) is a state after installation;

[0047] Fig.16 It is a schematic diagram for showing an operation method for switching the operation mode of an intraocular lens implantation device.

[0048] Explanation of reference numerals: 100, intraocular lens implant device; 1, push cylinder; 11, cylinder body; 11a, limit groove (first limit groove); 11c, limit groove (second limit groove); 111, implant head mounting portion; 12, handle; 13, conversion switch mounting portion; 14, conversion action portion; 141, tablet body portion (body portion); 142, tablet top portion (top portion); 14a, threaded fitting portion; 14b, locking rib; 2, core rod; 21, push rod; 21a, threaded portion; 21b, rotary connector; 21b1, shaft portion; 21b2, limit head; 21c , push-and-rotate operating head; 22, slider; 22a, push rod connecting portion; 22a1, shaft accommodating portion; 22a2, opening portion; 22a3, locking groove; 22b, elastic tongue; 22b1, tongue body; 22b2, protrusion; 22b21, inclined portion; 22b22, vertical portion; 23, push pin; 3, spring; 4, conversion switch; 41, bottom of conversion switch; 42, peripheral wall portion of conversion switch; 42a, locking protrusion; 40a, guide groove; 40b, outer guide surface; 40b1, locking groove; 40c, inner guide surface; 43, center hole; 5, implant head. DETAILED DESCRIPTION

[0049] In the following description, up-down, front-back and back-forth directions are defined (also indicated in the relevant drawings), but these directions are set for the convenience of description and do not necessarily limit the present invention.

[0050] <1. Summary>

[0051] like Figure 1 As shown, the intraocular lens implantation device 100 is mainly composed of an injection cylinder 1, a core rod 2 (a push rod 21 with a threaded portion, a push pin 23 and a slider 22 connecting the two), a spring 3, a conversion switch 4, and an implantation head 5. By operating the conversion switch 4, the push-in operation mode and the screw-in operation mode of the intraocular lens implantation device 100 can be switched. In the push-in operation mode, the operator can push the push rod 21 of the core rod 2 along the direction of the axis X of the injection cylinder 1 (front and back direction, injection direction) to move it forward and backward; in the screw-in operation mode, the operator can rotate the push rod 21 around the axis X of the injection cylinder 1 to move the push rod 21 forward and backward. The forward movement of the push rod 21 drives the slider 22 and the push pin 23 forward, and the forward moving push pin 23 pushes the intraocular lens 400 ( Fig.12 , Fig.13 etc.) are implanted into the human eye via the implant head 5.

[0052] In addition, the intraocular lens implantation device 100 of this embodiment is configured to not contain an intraocular lens 400. Before the operation, the operator (doctor) needs to install the intraocular lens 400 in the implantation head 5 and then install the implantation head 5 on the injection cylinder 1, and then perform the implantation operation. However, it can also be configured as a pre-installed intraocular lens implantation device containing an intraocular lens 400 (depending on different habits, some people also call it a pre-installed intraocular lens).

[0053] The following describes the main components of the intraocular lens implantation device 100. In the following description, unless otherwise specified, each component is described in the installed state (especially the description related to the direction).

[0054] <2. Main structural elements>

[0055] <2.1、Injection Cylinder>

[0056] like Figure 1 , 9 As shown, the injection cylinder 1 has a barrel portion 11 made of plastic (polymer material), the barrel portion 11 is cylindrical and open at both ends, the front end of the barrel portion 11 is formed with an implant head mounting portion 111, on which the implant head 5 can be mounted, and the rear end of the barrel portion 11 is formed with a switch mounting portion 13, on which the switch 4 can be mounted. A limit groove 11a (first limit groove) and a limit groove 11c (second limit groove) located behind the limit groove 11a are provided on the peripheral wall (specifically the lower part) of the barrel portion 11. The limit groove 11a is in the shape of a long groove extending in the front-to-back direction, and is used to prevent the core rod 2 from returning to the initial position of the movement after the movement is completed. The limit groove 11c is used to prevent the slider 22 (or the core rod 2) from falling off from the injection cylinder 1.

[0057] A handle 12 extending toward the outer peripheral side is provided on the outer peripheral surface of the barrel portion 11, and the handle 12 has a portion located on the upper side of the barrel portion 11 and a portion located on the lower side of the barrel portion 11. When performing a pushing operation, the operator usually places the index finger and the middle finger on the upper and lower sides of the handle 12 of the barrel portion 11 respectively, and pushes the push rod 21 with the thumb to move the core rod 2 forward in the pushing direction.

[0058] like Figure 2 , Fig.10As shown, the switch mounting portion 13 is integrally formed at the rear end of the barrel portion 11 and is located behind the handle 12. The switch mounting portion 13 has a flange portion 13a and a fixing groove 13b. The flange portion 13a protrudes toward the outer peripheral side relative to the outer peripheral surface of the other parts of the barrel portion 11, and the fixing groove 13b is formed between the flange portion 13a and the rear end surface 12a of the handle 12. In addition, a notch portion 13c is provided on the outer peripheral surface of the flange portion 13a, which is used for the engaging protrusion 42a of the switch 4 described later to pass through and enter the fixing groove 13b during assembly. In this embodiment, the notch portion 13c is two, and the angle between the two is 180°.

[0059] In addition, if Figure 2 , Fig.10 As shown, two conversion action parts 14 extending backward in claw shape are integrally formed on the rear end face 11b of the barrel 11 (it can also be said to be the rear end face of the injection barrel 1). The two conversion action parts 14 are separated by an angle of 180°, and each has a tablet body part 141 (main body part) and a tablet top end part 142 (top end part), wherein the tablet body part 141 extends backward (a direction in the axis X direction) and obliquely toward the inner circumference from the rear end face 11b of the barrel 11, and the tablet top end part 142 extends roughly parallel to the front-to-back direction (axis X direction). A threaded mating part 14a is provided on the surface of the tablet top end part 142 located on the inner circumference, and the threaded mating part 14a is screwed with the threaded part 21a on the push rod 21. In this embodiment, the threaded fitting portion 14 a is formed by a protrusion, and the threaded fitting portions 14 a on the two conversion action portions 14 are arranged at different positions in the front-to-back direction, which can be specifically set according to the parameter size of the threaded portion 21 a on the push rod 21 .

[0060] In addition, if Figure 2 As shown, a locking rib 14b is provided on the surface located on the outer peripheral side of the conversion action portion 14. The locking rib 14b is engaged with a locking groove 40b1 on the outer guide surface 40b described later.

[0061] <2.2, core rod (push rod, push pin, slider)>

[0062] like Figure 1 , 9 As shown, the core rod 2 is mainly composed of a push pin 23 (corresponding to the push injection component in this 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 to the rear of the slider 22. In addition, the push pin 23 and the slider 22 can also be an integrated component.

[0063] A threaded portion 21a is provided on the outer peripheral surface of the push rod 21, and the threaded portion 21a is used to engage with a threaded portion 14a ( Figure 2) are screwed together, so that the push rod 21 can be screwed in and moved forward. In addition, the threaded portion 21a can be a single-line thread structure or a double-line thread structure.

[0064] In addition, a push and turn operation head 21 c configured as a large diameter portion is provided at the rear end portion of the push rod 21 for the operator to perform a push operation or a turn operation.

[0065] In addition, if Figure 6 As shown, the front end of the push rod 21 is provided with a rotary connector 21b for connecting with the slider 22. The rotary connector 21b has a shaft portion 21b1 and a stopper 21b2 which is arranged at the front of the shaft portion 21b1 and has a larger diameter than the shaft portion 21b1 to form a large diameter portion.

[0066] like Figure 5 As shown, a push rod connection portion 22a is provided at the rear end of the slider (piston) 22, and the push rod connection portion 22a has a shaft accommodating portion 22a1, an opening portion 22a2 and a retaining groove 22a3. The shaft accommodating portion 22a1 is composed of a through hole provided on the rear end surface of the slider 22, and is used to accommodate the shaft portion 21b1 of the rotary connector 21b. The retaining groove 22a3 is composed of a groove provided on the side surface of the slider 22, and is a U-shaped groove with a circular arc surface at the bottom surface and a flat side wall, wherein the flat surface and the circular arc surface are tangent to each other. The retaining groove 22a3 is located in front of the shaft accommodating portion 22a1, and its internal space is connected to the internal space of the shaft accommodating portion 22a1. The retaining groove 22a3 is used to accommodate the limit head 21b2 of the rotating connector 21b. Its size corresponds to the limit head 21b2. Therefore, the distance between its two planar side walls is greater than the diameter of the shaft receiving portion 22a1. Overall, the retaining groove 22a3 and the shaft receiving portion 22a1 form a stepped hole. The opening portion 22a2 is arranged on the side of the shaft receiving portion 22a1, so that the side of the shaft receiving portion 22a1 is open. During assembly, the shaft portion 21b1 of the rotating connector 21b is expanded by elastically deforming the opening portion 22a2 so that it can enter the shaft receiving portion 22a1 through the opening portion 22a2.

[0067] like Figure 7 , Fig. 9 , Fig.10 As shown, the rotary connector 21b of the push rod 21 is engaged in the push rod connecting portion 22a in a manner that allows rotation but not forward and backward movement (especially backward movement). In this way, the push rod 21 can rotate relative to the slider 22 but cannot move forward and backward.

[0068] In addition, if Figure 5 , Figure 8As shown, an elastic tongue piece 22b is provided on the lower side of the slider 22, and in the initial state without operation, the elastic tongue piece 22b is engaged with the limit groove 11c on the barrel 11. In addition, when the operator moves the slider 22 forward from the initial state, the elastic tongue piece 22b can be engaged with the limit groove 11a on the barrel 11.

[0069] like Figure 8 As shown, the elastic tongue 22b is configured to be elastically deformable and move up and down, and has a tongue body 22b1 extending in the front-to-back direction and a protrusion 22b2 protruding downward from the tongue body 22b1. The protrusion 22b2 can be engaged in the limiting groove 11a or the limiting groove 11c. The front surface of the protrusion 22b2 is configured as an inclined surface 22b21 tilted downward and backward, and the rear surface is configured as a vertical surface 22b22 perpendicular to the front-to-back direction. In this way, when the protrusion 22b2 is engaged in the limiting groove 11a and the limiting groove 11c, it can no longer move backward and disengage from the limiting groove 11a and the limiting groove 11c, but can move forward and disengage from the limiting groove 11a and the limiting groove 11c by elastic deformation.

[0070] In this way, when the elastic tongue 22b is engaged with the limiting groove 11c, the slider 22 (core rod 2) can be prevented from falling off the injection cylinder 1; when the elastic tongue 22b is engaged with the limiting groove 11a, the slider 22 (core rod 2) can be prevented from retreating to the initial position when not operated.

[0071] like Figure 1 , Fig. 9 As shown, the push pin 23 (injection component) is in the shape of an elongated rod, fixedly connected to the front end of the slider 22, and extends forward from the slider 22. The front end of the push pin 23 is formed into a predetermined shape, and is used to push the intraocular lens 400 and inject it into the human eye through the implant head 5.

[0072] <2.3, Spring>

[0073] like Figure 2 As shown, a spring 3 is provided inside the barrel 11, and the spring 3 is located between the front part of the barrel 11 and the slider 22. The spring 3 is compressed by the core rod 2 moving forward, so that in the push-in operation mode, the core rod 2 can be retracted at any time under the action of the spring 3, avoiding the defect that the retraction operation cannot be performed in the push-in operation mode.

[0074] <2.4, Switch>

[0075] like Figure 3 , Figure 4 , Fig.10As shown, the conversion switch 4 is generally in the shape of a bowl with a hole at the bottom, and has a bottom 41 and a peripheral wall portion 42, wherein the peripheral wall portion 42 is cylindrical, and the conversion action portion 14 is accommodated therein, and the bottom 41 is located at one end in the axial direction of the peripheral wall portion 42, and a through center hole 43 is opened on the bottom 41. In addition, two guide grooves 40a extending in the circumferential direction are provided on the inner wall of the bottom 41, and the guide groove 40a has an outer guide surface 40b as its outer peripheral side wall surface and an inner guide surface 40c as its inner peripheral side wall surface, and the outer guide surface 40b and the inner guide surface 40c are in the shape of an arc, and the center of the arc is at a different position from the center of the center hole 43. Specifically, the outer guide surface 40b and the inner guide surface 40c are formed in a direction ( Figure 3 , Figure 4 In other words, the outer guide surface 40b and the inner guide surface 40c are formed into a spiral shape that expands toward the outer peripheral side.

[0076] The rear end of the pressing piece top portion 142 of the above-mentioned conversion action portion 14 is embedded in the guide groove 40a from the front, and its inner peripheral surface and outer peripheral surface can contact the inner guide surface 40c and the outer guide surface 40b of the guide groove 40a respectively.

[0077] Along Figure 4 When the conversion switch 4 is rotated in the clockwise direction, the conversion switch 4 rotates around the center hole 43 (also around the axis X of the barrel portion 11). At this time, the outer guide surface 40b pushes the conversion action portion 14 toward the inner circumference, so that the top end portion 142 of the pressing piece moves toward the center side (inner circumference). In this way, the threaded matching portion 14a provided on the top end portion 142 of the pressing piece reaches a position where it can be screwed together (threadedly matched) with the threaded portion 21a of the push rod 21, thereby converting the intraocular lens implant device 100 into a screw-in operation mode.

[0078] On the contrary, along Figure 4 When the conversion switch 4 is rotated counterclockwise, the conversion switch 4 rotates around the center hole 43 (also around the axis of the barrel 11). At this time, the inner guide surface 40c pushes the conversion action part 14 toward the outer peripheral side, so that the top end part 142 of the pressing piece moves away from the center side (the outer peripheral side). In this way, the threaded fitting part 14a reaches a position where it cannot be screwed together (threaded fitting) with the threaded part 21a of the push rod 21, thereby converting the artificial lens implant device 100 into a push-in operation mode. Figure 4 The illustrated state is that the threaded engagement portion 14 a is located at a position where it cannot be screwed (threadedly engaged) with the threaded portion 21 a of the push rod 21 .

[0079] In this manner, the switching mechanism 10 for switching the operation mode is mainly composed of the changeover switch 4 and the changeover operation unit 14 .

[0080] In addition, when the tablet tip portion 142 moves in the inner circumference-outer circumference direction as described above, the switching action portion 14 (mainly the tablet body portion 141 ) is flexibly deformed.

[0081] like Figure 3 As shown, a locking groove 40b1 is provided in the middle of the outer guide surface 40b. When the operator rotates the conversion switch 4 counterclockwise to convert the intraocular lens implant device 100 into a screw-in operation mode, the locking rib 14b on the conversion action part 14 engages with the locking groove 40b1. In this way, it can prevent the conversion switch 4 from returning to the position in the push-in operation mode when the operator's hand leaves the conversion switch 4.

[0082] In addition, if Figure 3 , Figure 4 As shown, the guide groove 40a has stopper surfaces 40d1 and 40d2 as wall surfaces at the circumferential ends thereof, that is, the maximum operable range (rotation angle range) of the rotation operation of the switch 4 is limited by the contact between the stopper surfaces and the side surface of the top end portion 142 of the pressing piece of the switching action portion 14. In addition, a stopper surface may be provided at one end portion of the guide groove 40a in the circumferential direction.

[0083] like Figure 3 As shown, a snap-fit ​​protrusion 42a protruding toward the inner side is provided at the edge of the inner circumferential surface of the peripheral wall portion 42 of the conversion switch 4 away from the bottom 41 side. During assembly, the snap-fit ​​protrusion 42a passes through the notch portion 13c through elastic deformation and enters and snaps into the fixing groove 13b, thereby installing the conversion switch 4 on the barrel portion 11 of the injection cylinder 1.

[0084] <3. Method of operating the intraocular lens implant device>

[0085] Refer to the following Figure 11-Figure 16 The operation method of the intraocular lens implantation device 100 having the above structure is described.

[0086] First, if Fig.11 As shown in FIG. 5 , a proper 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. Fig.12 As shown, the edge of the optical part of the intraocular lens 400 is clamped with forceps 300 and gently placed into the rear of the implant head 5. Fig.13 , Fig.14 As shown, the rear support portion 401 of the intraocular lens 400 is folded over the front surface of the optical portion of the intraocular lens 400 and pushed forward to push the intraocular lens 400 to the marked position in the implant head 5. Then, as shown in FIG. Fig.15 As shown, the implant head 5 is installed on the injection barrel 1 so that the implant head 5 is completely engaged in the positioning groove on the injection barrel 1. Fig.16As shown, the operator rotates the conversion switch 4 as needed to switch the push rod 21 between the push-in operation mode and the screw-in operation mode, and then implants the intraocular lens 400 into the eye through a surgical incision.

[0087] <4. Summary of the present embodiment>

[0088] According to this embodiment, the following method can be obtained:

[0089] The ophthalmic implant implanting device 100 includes a push rod 1 and a push rod 21 which is operated by an operator to move along the axis of the push rod 1 and has a threaded portion 21a. The push rod 21 has a push-in operation mode in which it is pushed and moved by the operator and a screw-in operation mode in which it is rotated and moved by the operator. The ophthalmic implant implanting device 100 also includes a switching mechanism 10 for switching between the push-in operation mode and the screw-in operation mode. The switching mechanism 10 includes: a conversion action portion 14, which is fixedly arranged on the push rod 1, extends along the axial direction of the push rod 1, and has a threaded fitting portion 14a; a conversion switch 4, which is rotatably mounted on the push rod 1 and has a guide surface (an outer guide surface 40b and / or an inner guide surface 40c) 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 portion 14 in the inner circumference-outer circumference direction, causing the conversion action portion 14 to be flexibly deformed, thereby causing the threaded fitting portion 14a to move in the inner circumference-outer circumference direction.

[0090] By adopting the above method, since only the guide surface and the conversion action part 14 are needed to realize the conversion between the push-in operation mode and the screw-in operation mode, the structure is simple and the manufacturing cost is low.

[0091] In the present embodiment, the guide surface includes an outer guide surface 40 b and an inner guide surface 40 c . The outer guide surface 40 b pushes the switching operation part 14 from the outer peripheral side, and the inner guide surface 40 c pushes the switching operation part 14 from the inner peripheral side.

[0092] By adopting the above structure, the inner and outer guide surfaces push and guide the conversion action part 14, which can improve the operation reliability of the conversion action part 14 and avoid switching failures caused by insufficient restoring force of the conversion action part 14 when only inner and outer guide surfaces are provided.

[0093] In addition, in this embodiment, the switch 4 has 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 portion 41, and the guide surface is composed of the inner peripheral side wall surface or the outer peripheral side wall surface of the guide groove. In addition, the guide surface is in an arc shape that is not concentric with the axis X.

[0094] In addition, in the present embodiment, the switching action portion 14 is integrally formed on the injection cylinder 1. In this way, the structure can be simplified and the loss of parts during assembly can be avoided.

[0095] In addition, in this embodiment, the switching action part 14 is provided on the rear end surface of the injection cylinder 1, and the switching switch 4 is installed at the rear end of the injection cylinder 1. In this way, compared with the structure in which the switching action part 14 and the switching switch 4 are provided in the middle of the injection cylinder 1, the injection cylinder 1 can be easily formed and the switching switch 4 can be easily installed.

[0096] In addition, in the present embodiment, the conversion action part 14 includes a tablet body part 141 (body part) and a tablet top part 142 (top part), the tablet body part 141 extends along the axis X direction and can be flexed and deformed, the tablet top part 142 is arranged at the end (extended terminal part) of the tablet body part 141, and a threaded fitting part 14a is formed on the tablet top part 142. Further, the tablet body part 141 extends obliquely toward the inner peripheral side from the injection cylinder 1 in one direction in the axial direction, and the tablet top part 142 extends parallel to the axial direction. In this way, the conversion action part 14 can be easily flexibly deformed.

[0097] In addition, in the present embodiment, a locking groove 40 b 1 is provided in the middle of the guide surface, and a locking rib 14 b that can be engaged with the locking groove 40 b 1 is provided on the switching action portion 14 .

[0098] With the above structure, the position of the switch 4 can be prevented from shifting by the engagement of the locking groove 40b1 with the locking rib 14b.

[0099] In this embodiment, stopper surfaces 40d1 and 40d2 are provided at the circumferential ends of the guide groove 40a so as to be in contact with the switching operation portion 14. Thus, the rotational operation range of the switching switch 4 can be limited with a simple structure.

[0100] <5. Modifications>

[0101] In the above description, the guide groove 40a has an outer guide surface 40b and an inner guide surface 40c, however, the present application is not limited thereto, for example, it may only have an outer guide surface 40b, at which time, the conversion action part 14 is set to be in a natural state, where the top end 142 of the pressing piece is located at a position where the threaded mating part 14a cannot be screwed with the threaded part 21a, and the top end 142 of the pressing piece is pushed toward the inner circumference by the outer guide surface 40b, at which time, the conversion action part 14 is elastically deformed, and the top end 142 of the pressing piece moves toward the inner circumference to a position where the threaded mating part 14a can be screwed with the threaded part 21a. Afterwards, the conversion switch 4 is rotated in the reverse direction, so that the outer guide surface 40b releases the push on the top end 142 of the pressing piece, at which time, the elastic deformation of the conversion action part 14 is restored, so that the top end 142 of the pressing piece is reset. It can be inferred from this that only the inner guide surface 40c may be provided, so that the movement of the top end portion 142 of the pressing piece to the non-rotatable position is achieved by the push of the inner guide surface 40c, and the movement to the screwable position is achieved by the elastic restoring force of the conversion action portion 14.

[0102] In addition, in the above description, the guide groove 40 a is a groove with a bottom, however, the present application is not limited thereto, for example, the guide groove 40 a may also pass through the bottom 41 of the conversion switch 4 .

[0103] In addition, in the above description, the guide groove 40a is set on the bottom 41 of the conversion switch 4, however, the present application is not limited to this, and it can also be set in other parts. In other words, the shape of the conversion switch 4 is not limited to the bowl shape, but can also be other shapes.

[0104] In addition, in the above description, the outer guide surface 40b and the inner guide surface 40c are arc-shaped, however, the present application is not limited to this, and can also be formed into other shapes, such as a parabola or an involute shape, as long as it extends toward the outer periphery in one direction in the circumferential direction (or expands toward the outer periphery).

[0105] In addition, in the above-mentioned embodiment, two conversion operation units 14 are provided, however, the number is not limited thereto, and for example, four or other numbers may be provided.

[0106] Furthermore, in the above-mentioned embodiment, the switching action part 14 is integrally formed on the cylindrical part 11 , however, the present invention is not limited thereto, and the switching action part 14 may be independently formed and fixed to the cylindrical part 11 .

[0107] In addition, in the above-mentioned embodiment, the present invention is described by taking the application to the intraocular lens implantation device 100 as an example, however, the present invention may also be applied to other ophthalmic implantation devices.

[0108] In the above embodiment, the switching operation portion 14 extends along the axis X direction, however, the present invention is not limited thereto, and the switching operation portion 14 may be configured to extend along the circumferential direction.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present 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 implantation device according to claim 1, characterized in that: The guide surface includes an outer guide surface (40b) and / or an inner guide surface (40c), wherein 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).

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