JP7613199B2 - Intraocular lens insertion device - Google Patents

Description

This disclosure relates to an intraocular lens insertion device for inserting an intraocular lens into the eye.

Traditionally, one of the most common surgical methods for cataracts is to insert a soft, foldable intraocular lens into the eye instead of the crystalline lens. In some cases, the intraocular lens is inserted in front of the crystalline lens to correct the refractive power of the eye. An intraocular lens insertion tool called an injector is sometimes used to insert the intraocular lens into the eye.

One such injector is an intraocular lens insertion device that pushes out an intraocular lens through a hollow portion of an insertion section with a notch formed at the tip, the inner diameter of which gradually decreases toward the tip, folding the intraocular lens small and ejecting it from the tip (see, for example, Patent Document 1). The intraocular lens insertion device of Patent Document 1 ejects the intraocular lens while tacking the rear support part onto the optical part. Another intraocular lens insertion device is known that stores the intraocular lens while supporting the edge of the optical part with a lens support member, and can smoothly eject the intraocular lens into the eye using an ejection shaft while it is stored.

JP 2004-351196 A

However, in the intraocular lens insertion device of Patent Document 1 described above, when the intraocular lens is preloaded and the rear support part is tacked onto the optical part before ejection, there is a possibility that the rear support part to be tacked may interfere with the movement restriction mechanism for storage. This interference may cause unintended deformation of the rear support part.

The present disclosure has been made to solve the above-mentioned problems, and the technical objective is to achieve both the restriction of intraocular lens movement during storage and the appropriate tacking of the rear support part during ejection in an intraocular lens insertion device.

An intraocular lens insertion device provided by a typical embodiment of the present disclosure is an intraocular lens insertion device that stores an intraocular lens having a disk-shaped optical portion and a pair of support portions extending radially outward from an outer periphery of the optical portion on a push-out shaft inside a cylindrical main body in advance, and pushes the stored intraocular lens from a base end side to a tip end side along the push-out shaft with a rod-shaped plunger to insert the intraocular lens into a patient's eye, the cylindrical main body having a storage section in which the intraocular lens is stored such that a front support portion, which is one support portion, is disposed on the tip end side and a rear support portion, which is the other support portion, is disposed on the base end side with respect to the optical portion, and a storage section provided in the storage section, and a first restricting portion that restricts a peripheral edge of the optical portion of the intraocular lens stored in the storage unit from moving in a direction parallel to the optical axis, the peripheral edge being the farthest from the extrusion axis, the first restricting portion being configured in a brim shape extending from a side inner wall side, which is a side on which a root of the rear support portion is not disposed, of an inner wall of the storage unit facing a direction intersecting the extrusion axis in an in-plane direction of the optical surface of the optical portion, to a position facing a part of a front optical surface of the optical portion, and a first gap is provided between the first restricting portion and a ceiling inner wall of the inner wall of the storage unit facing the front optical surface, through which a tip of the rear support portion that is deformed to a position facing the front optical surface can pass ,
a second restriction portion that restricts a peripheral edge of the optical portion of the intraocular lens stored in the storage portion on a base end side of the push-out shaft from moving in a direction parallel to the optical axis,
the second restricting portion is configured in a flange shape extending in an in-plane direction of an optical surface of the optical portion from a base end side of the extrusion shaft to a position facing a part of the front optical surface,
A second gap is provided between the second restricting portion and the ceiling inner wall, through which the tip of the rear support portion, which is deformed to a position facing the front optical surface, can pass.

The intraocular lens insertion device disclosed herein can both restrict the movement of the intraocular lens during storage and provide optimal tacking of the rear support part during ejection.

FIG. 2 is a plan view of an intraocular lens insertion instrument. FIG. 2 is a side view of an intraocular lens insertion device. FIG. 2 is a plan view of an intraocular lens. FIG. 2 is a right side view of the intraocular lens. 3 is a cross-sectional view taken along line VV in FIG. 2. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. 6 is a cross-sectional view illustrating a case where a rear support portion of an intraocular lens is poorly tacked, using a view equivalent to FIG. 5 . 8 is a cross-sectional view taken along line VIII-VIII in FIG. 2 when the rear support portion of the intraocular lens is normally tacked. IX-IX line cross-sectional view of FIG. 2. 10 is a cross-sectional view taken along line XX in FIG. 9. 10 is a cross-sectional view taken along line XI-XI of FIG. 9. 11 is a cross-sectional view corresponding to FIG. 10 illustrating a case where a rear support portion of an intraocular lens is poorly tacked. 10 is a cross-sectional view taken along line XIII-XIII in FIG. 9 when the rear support portion of the intraocular lens is normally tacked.

＜Overview＞
The intraocular lens insertion device exemplified in the present disclosure is an intraocular lens insertion device that stores an intraocular lens having a disk-shaped optical section and a pair of support sections extending radially outward from an outer periphery of the optical section on a push-out shaft inside a cylindrical main body in advance, and pushes the stored intraocular lens from the base end side to the tip end side along the push-out shaft with a rod-shaped plunger to insert the intraocular lens into a patient's eye. The cylindrical main body includes a storage section in which the intraocular lens is stored such that one support section, the front support section, is disposed on the tip end side relative to the optical section, and the other support section, the rear support section, is disposed on the base end side, and a first restricting section that is provided in the storage section and restricts the edge of the optical section of the intraocular lens stored in the storage section that is farthest from the push-out shaft from moving in a direction parallel to the optical axis. The first restricting section is configured in a brim shape that extends from a side inner wall side, which is a side on which the root of the rear support section is not disposed, of the inner wall of the storage section that faces the optical surface of the optical section in the in-plane direction and in the direction intersecting the push-out shaft, to a position facing a part of the front optical surface of the optical section. A first gap is provided between the first restricting portion and the ceiling inner wall of the storage portion that faces the front optical surface, through which the tip of the rear support portion, which is deformed to a position facing the front optical surface, can pass.

The intraocular lens insertion device disclosed herein has a first restricting portion, and therefore can restrict the edge of the optical portion of the intraocular lens stored in the storage portion that is farthest from the extrusion axis from moving in a direction parallel to the optical axis. The first restricting portion is configured in a brim shape that extends from the side inner wall side of the inner wall of the storage portion, which is the side on which the root of the rear support portion is not disposed, to a position facing a part of the front optical surface of the optical portion, and a first gap is provided between the first restricting portion and the ceiling inner wall. Therefore, when the rear support portion tacks, the tip passes through the first gap, allowing for suitable tacking. This makes it possible to achieve both restriction of movement of the intraocular lens during storage and suitable tacking of the rear support portion during ejection.

The intraocular lens insertion device may further include a second restricting portion that restricts the edge of the optical portion of the intraocular lens stored in the storage portion on the base end side of the push shaft from moving in a direction parallel to the optical axis. The second restricting portion is configured in a flange shape that extends in the in-plane direction of the optical surface of the optical portion from the base end side of the push shaft to a position facing a part of the front optical surface. A second gap is provided between the second restricting portion and the ceiling inner wall, through which the tip of the rear support portion that is deformed to a position facing the front optical surface can pass. With this configuration of the second restricting portion, when tacking of the rear support portion starts, the rear support portion can be guided from the base end side of the push shaft to the front optical surface, thereby achieving even more suitable tacking.

The first and second restricting parts of the intraocular lens insertion device may each extend circumferentially around the optical part while maintaining a flange shape and be connected together. This makes it easier to tuck the entire rear support part up to the front optical surface, since the first and second restricting parts are connected together.

In the intraocular lens insertion device, the first restricting portion may be disposed on the proximal side of the push-out axis relative to a virtual plane that is perpendicular to the push-out axis and includes the optical axis. This makes it possible to suppress interference with the first restricting portion when advancing the entire intraocular lens after tacking the rear support portion, making it difficult for unintended deformation of the intraocular lens to occur.

In the intraocular lens insertion device, the connected first and second restricting parts may be formed with a slope for sliding the rear support part in the process of deformation to a position where the tip of the rear support part faces the front optical surface. Such a slope allows the rear support part to be gradually deformed, so that it can be tucked smoothly.

First Embodiment
Hereinafter, a first embodiment, which is one of typical embodiments of the present disclosure, will be described with reference to the drawings.

<Injector 1 (intraocular lens insertion device)>
The structure of the injector 1, which is an intraocular lens insertion instrument, will be described. As shown in Figs. 1 and 2, the injector 1 (intraocular lens insertion instrument) of this embodiment is composed of an insertion instrument body 10 (cylindrical body), a plunger 12, and the like. The insertion instrument body 10 includes an insertion section 20 and a storage section 22. Such an injector 1 is formed, for example, by injection molding using a resin material (for example, polypropylene) or the like. The injector 1 may also be formed by cutting out a resin. The injector 1 may be of a cartridge type in which the insertion section 20 is replaceable. The injector 1 of this embodiment is a so-called preload type, and is shipped in a state in which an intraocular lens 100 is preloaded.

<Intraocular lens 100>
An example of an intraocular lens 100 inserted into the eye by an injector 1 (intraocular lens insertion device) will be described. As shown in Figs. 3 and 4, the intraocular lens 100 used in this embodiment is a one-piece type intraocular lens in which the optical part 110 and a pair of support parts, a front support part 112A and a rear support part 112B, are integrally molded with a flexible material. The intraocular lens 100 can adopt various soft resin materials as the flexible material, such as simple substances such as BA (butyl acrylate) and HEMA (hydroxyethyl methacrylate), and composite materials of acrylic acid ester and methacrylic acid ester. Although the so-called one-piece type intraocular lens 100 is exemplified in the first embodiment, at least a part of the technology exemplified in this disclosure can also be applied to a so-called three-piece type intraocular lens in which the optical part 110 and a pair of support parts (the front support part 112A and the rear support part 112B) are formed of separate members.

The optical part 110 provides a predetermined refractive power to the patient's eye. The optical part 110 is formed in a disk shape. The optical axis L of the optical part 110 passes through the center of the optical part 110 and extends in the vertical direction (thickness direction of the optical part 110). The front support part 112A and the rear support part 112B extend from the outer peripheral part 110a (edge) of the optical part 110 in a curved manner radially outward (outside), and are formed in a position that is point symmetrical with respect to the optical axis L, which is the center of the optical part 110. The front support part 112A has a root part 116A connected to the outer peripheral part 110a of the optical part 110 via the connection part 114A, has a loop shape curved in the circumferential direction, and has an open tip part 118A. (That is, the tip part 118A is a free end). In addition, the rear support portion 112B has a base portion 116B connected to the outer peripheral portion 110a of the optical portion 110 via a connecting portion 114B, and has a circumferentially curved loop shape, with the tip portion 118B open (i.e., the tip portion 118B is a free end). The optical portion 110 has, as an end surface in the optical axis L direction, a front optical surface 110c that faces the ceiling surface 22b of the storage portion 22, and a rear optical surface 110b that is opposite the front optical surface 110c and faces the bottom surface 22c of the storage portion 22, as described below.

In the intraocular lens 100 of this embodiment, only the thickness of the optical portion 110 varies depending on the power of the lens, but the contour shape of the optical portion 110 as viewed from the direction of the optical axis L and the shapes of the front support portion 112A and the rear support portion 112B do not change. In other words, the radii of curvature of the front optical surface 110c and the rear optical surface 110b, and the thickness of the outer circumferential portion 110a (also called the edge) change depending on the power, and the thickness of the optical portion 110 changes.

<Insertion instrument body 10 (cylindrical body)>
The insertion instrument body 10 will be described in detail with reference to Fig. 5. The insertion instrument body 10 includes an insertion section 20 and a storage section 22. The insertion section 20 and the storage section 22 are formed in a hollow cylindrical shape.

<Insertion unit 20>
As shown in Figures 5 and 6, the insertion section 20 has a passage 20b (front passage). The passage 20b has a space through which the intraocular lens 100 passes narrower toward the tip 20a of the insertion section 20 in order to fold the intraocular lens 100. That is, the passage area gradually decreases toward the tip 20a. The passage area is the cross-sectional area of the passage 20b in a cross section perpendicular to the extrusion direction of the intraocular lens 100 (leftward in Figure 5).

The tip 20a of the insertion section 20 is formed with a notch (bevel) for sending the intraocular lens 100 to the outside. The intraocular lens 100 that passes through the passage 20b is folded small along the inner wall surface 20c (front inner wall surface), sent out from the notch at the tip 20a, and inserted into the eye. The inner wall surfaces 20c (first inner wall surface 24a and second inner wall surface 24b) are formed on both sides in a direction perpendicular to the central axis Lt of the passage 20b and parallel to the radial direction of the optical section 110 when the intraocular lens 100 is placed in the passage 20b. The first inner wall surface 24a and the second inner wall surface 24b are formed in a shape (incline) symmetrical with respect to the central axis Lt of the passage 20b.

The ceiling surface (the inner wall on the front side of the paper in FIG. 5) and the bottom surface 20e (see FIG. 5) are formed on both sides in a direction perpendicular to the central axis Lt of the passage 20b and parallel to the central axis (optical axis) L of the optical part 110 when the intraocular lens 100 is placed in the passage 20b. The bottom surface 20e is curved concavely toward the outside of the passage 20b (the back side of the paper in FIG. 5).

As shown in Figures 5 and 6, the X-axis, Y-axis, and Z-axis are assumed to be mutually orthogonal, and the direction parallel to the extrusion direction of the intraocular lens 100 (the direction of the central axis Lt of the passage 20b and the passage 22a, the direction of the extrusion axis Lp) is defined as the X-axis direction. Then, the passage 20b is surrounded by two inner wall surfaces 20c (first inner wall surface 24a and second inner wall surface 24b) formed on both sides in the Y-axis direction, and a ceiling surface (the inner wall on the front side of the paper in Figure 5) and a bottom surface 20e (see Figure 5) formed on both sides in the Z-axis direction. The central axis Lt of the passage 20b coincides with the extrusion axis Lp.

<Storage section 22>
5, the storage section 22 is formed at a position rearward (to the right in FIG. 5) of the insertion section 20 in the pushing direction of the plunger 12. Then, in a passage 22a (rear passage) formed inside the storage section 22, the intraocular lens 100 before being pushed out by the plunger 12 is filled (placed) in advance.

The storage section 22 also has side inner walls that face the in-plane direction (orthogonal to the optical axis L) of the optical surfaces (front optical surface 110c, rear optical surface 110b) of the optical section 110 and in a direction intersecting the extrusion axis Lp (Y-axis direction). The side inner walls are composed of a right inner wall 22d (wall surface above the extrusion axis Lp on the paper surface of FIG. 5) and a left inner wall 22e (wall surface below the extrusion axis Lp on the paper surface of FIG. 5). As a result, the passage 22a in the storage section 22 forms an internal space surrounded by the ceiling surface 22b (see FIG. 6), the bottom surface 22c, the right inner wall 22d, and the left inner wall 22e.

Here, the intraocular lens 100 stored in the storage section 22 will be described. As shown in FIG. 5, the front optical surface 110c of the optical section 110 of the intraocular lens 100 faces the ceiling surface 22b of the storage section 22, and the rear optical surface 110b opposite to the front optical surface 110c faces the bottom surface 22c of the storage section 22. The optical section 110 is disposed in the storage section 22 at approximately the center of the extrusion axis Lp direction (X-axis direction) and at approximately the center of the left-right direction (Y-axis direction) intersecting the extrusion axis Lp. This results in the optical axis L of the optical section 110 being disposed on the extrusion axis Lp. In addition, the intraocular lens 100 has a front support section 112A, which is one of the support sections, disposed on the front side (the tip 20a of the insertion section 20) side (left direction in FIG. 5) of the optical section 110. The root portion 116A of the front support portion 112A is disposed on the right inner wall 22d side. The other support portion, the rear support portion 112B, is disposed on the rear side (the base end side of the extrusion axis Lp, opposite the tip 20a of the insertion portion 20) (rightward in FIG. 5) of the intraocular lens 100 relative to its optical portion 110. The root portion 116B of the rear support portion 112B is disposed on the left inner wall 22e side.

5, the storage section 22 is provided with a first pin 31, a second pin 32, a third pin 33, a first restricting section 41, a second restricting section 42, and a third restricting section 43. When the intraocular lens 100 is stored, the movement of the optical section 110 in the storage section 22 is restricted by the first pin 31, the second pin 32, the third pin 33, the first restricting section 41, the second restricting section 42, and the third restricting section 43. The first restricting section 41, the second restricting section 42, and the third restricting section 43 restrict the movement of the outer peripheral portion 110a (edge) of the optical section in a direction parallel to the optical axis L (Z-axis direction in FIG. 5). The first restricting section 41 and the third restricting section 43 also restrict the movement of the optical section 110 in the left-right direction (Y-axis direction) intersecting the extrusion axis Lp. The first pin 31, the third pin 33, and the second restricting portion 42 restrict movement of the optical portion 110 in the direction of the extrusion axis Lp (X-axis direction, front-rear direction). The second pin 32 restricts rotation of the intraocular lens 100 in the circumferential direction.

The first pin 31, the second pin 32, and the third pin 33 are shaft-shaped members that can be inserted and removed from the passage 22a from outside the storage section 22, and are removed from the insertion device body 10 by the user when using the injector 1 (specifically, immediately before the user presses the plunger 12). When the first pin 31 to the third pin 33 are removed, the intraocular lens 100 becomes capable of moving in the direction of the tip of the extrusion axis Lp. The first pin 31 is disposed on the outer periphery adjacent to the outer periphery portion 110a (edge) of the optical part 110, on the forward side of the optical axis L, and on the extrusion axis Lp. As a result, the first pin 31 restricts the movement of the optical part 110 in the direction of the extrusion axis Lp (X-axis direction, front-back direction) to the forward side (tip 20a of the insertion part 20) (leftward in FIG. 5). The second pin 32 is disposed at a position adjacent to the root portion 116B of the rear support portion 112B on the outer periphery adjacent to the outer periphery portion 110a (edge) of the optical portion 110, and is sandwiched between the outer periphery portion 110a (edge) and the rear support portion 112B. As a result, the second pin 32 restricts the circumferential rotation of the intraocular lens 100 (counterclockwise on the paper surface of FIG. 5).

The first restricting portion 41 is provided in the storage portion 22. The first restricting portion 41 restricts the portion of the outer peripheral portion 110a (edge) of the optical portion 110 of the intraocular lens 100 stored in the storage portion 22 that is farthest from the extrusion axis Lp from moving in a direction parallel to the optical axis L (the Z-axis direction in FIG. 5). The first restricting portion 41 is configured in a brim shape extending from the right side inner wall 22d side to a position facing a part of the front optical surface 110c of the optical portion 110. The right side inner wall 22d is a wall surface (wall surface above the extrusion axis Lp in the paper plane of FIG. 5) on the side where the root portion 116B of the rear support portion 112B is not arranged among the inner walls of the storage portion 22 facing the in-plane direction (perpendicular direction to the optical axis L) of the optical surfaces (front optical surface 110c, rear optical surface 110b) of the optical portion 110 and the direction intersecting the extrusion axis Lp. The first restricting portion 41 is disposed on the base end side of the extrusion axis Lp (rightward in FIG. 5) of the imaginary plane Vs that is perpendicular to the extrusion axis Lp and includes the optical axis L. Here, a first gap S1 (see FIG. 6) is provided between the first restricting portion 41 and the ceiling surface 22b (ceiling inner wall) facing the front optical surface 110c among the inner walls of the storage portion 22. The first gap S1 is larger than the thickness T1 (see FIG. 4) of the rear support portion 112B. This first gap S1 allows the rear support part 112B and its tip part 118B to pass through without interfering with parts inside the storage part 22 when the rear support part 112B is tucked (deformed) to a position facing the front optical surface 110c. For example, the maximum thickness in the region of the distal half of the length of the rear support part 112B may be the thickness T1 described above.

Here, consider tacking of the rear support part 112B assuming that the first restricting part 41 has a shape that protrudes downward from the ceiling surface 22b toward the bottom surface 22c (in other words, a structure without a first gap). In this case, as shown in FIG. 7, if the rear support part 112B and the first restricting part 41 come into contact during tacking of the rear support part 112B, there is a risk that the tip part 118B of the rear support part 112B will bend toward the base end side of the extrusion shaft Lp. The reason why the rear support part 112B and the first restricting part 41 come into contact is that, for example, the higher the room temperature, the softer the entire intraocular lens 100 becomes and the easier it is to deform significantly. In contrast, as shown in FIG. 8, the storage part 22 has a first gap S1 between the first restricting part 41 and the ceiling surface 22b. Therefore, the tip part 118B of the rear support part 112B can pass through the first gap S1, so unintended deformation is unlikely to occur.

The second restricting portion 42 restricts the movement of the outer peripheral portion 110a (edge) at the base end side of the extrusion axis Lp of the optical portion 110 of the intraocular lens 100 stored in the storage portion 22 in a direction parallel to the optical axis L (Z-axis direction in FIG. 5). The second restricting portion 42 is configured in a brim shape extending in the in-plane direction (perpendicular to the optical axis L) of the optical surface (front optical surface 110c, rear optical surface 110b) of the optical portion 110 from the base end side of the extrusion axis Lp (right side in FIG. 5) to a position facing a part of the front optical surface 110c. A second gap S2 (see FIG. 6) is provided between the first restricting portion 41 and the ceiling surface 22b (ceiling inner wall). The second gap S2 has the same gap interval as the first gap S1. This second gap S2 allows the rear support part 112B and its tip part 118B to pass through the storage part 22 without interfering with the parts inside the storage part 22 when the rear support part 112B is tucked (deformed) to a position facing the front optical surface 110c.

The third restricting portion 43 is provided in the storage portion 22. The third restricting portion 43 restricts the movement of the outer peripheral portion 110a (edge) of the optical portion 110 of the intraocular lens 100 stored in the storage portion 22, which is the portion of the outer peripheral portion 110a farthest from the extrusion axis Lp, in a direction parallel to the optical axis L (Z-axis direction in FIG. 5). The third restricting portion 43 is configured in a brim shape extending from the left inner wall 22e side to a position facing a part of the front optical surface 110c of the optical portion 110. The left inner wall 22e is the wall surface (wall surface below the extrusion axis Lp in the paper plane of FIG. 5) on the side where the root portion 116B of the rear support portion 112B is arranged, among the inner walls of the storage portion 22 facing the in-plane direction (orthogonal direction to the optical axis L) of the optical surface (front optical surface 110c, rear optical surface 110b) of the optical portion 110 and the direction intersecting the extrusion axis Lp. The third restricting portion 43 is disposed on the base end side of the extrusion axis Lp relative to an imaginary plane Vs that is perpendicular to the extrusion axis Lp and includes the optical axis L.

As shown in FIG. 5, the bottom surface 22c of the passage 22a formed inside the storage section 22 is provided with a convex portion 22f that suppresses the inclination of the optical section 110 when the intraocular lens 100 is pushed toward the tip 20a of the insertion section 20 by the plunger 12 and moves. The convex portion 22f is disposed in a position facing the outer peripheral portion 110a, which is the edge of the optical section 110 of the intraocular lens 100, at the following location. The convex portion 22f is disposed on the forward (tip 20a of the insertion section 20) side (left direction in FIG. 5) of the optical axis L of the optical section 110 of the intraocular lens 100, and on the side where the root portion 116A of the front support portion 112A of the intraocular lens 100 is not disposed as viewed from the central axis Lt (which is also the extrusion axis Lp in the extrusion direction of the plunger 12) (left side inner wall 22e: below the central axis Lt in FIG. 5). The convex portion 22f protrudes from the bottom surface 22c toward the ceiling surface 22b in an arch shape and is close to the outer peripheral portion 110a of the optical portion 110 on the side of the rear optical surface 110b. The convex portion 22f is tapered toward the protruding direction and has a rounded fillet processing at the tip. This convex portion 22f can suppress the inclination of the optical portion 110 when the intraocular lens 100 is pushed out by the plunger 12, and can suppress the occurrence of a so-called "rear tacking state" in which the front support portion 112A of the intraocular lens 100 is unintentionally tacked to the rear optical surface 110b side. Here, in the intraocular lens 100 with the rear support portion 112B tacked, a restoring force that tries to release the tacked state is accumulated in the intraocular lens 100. Since the rear support portion 112B is pushed by the plunger 12, the above-mentioned restoring force is likely to act as a stress in the lower left direction of the optical portion 110 (lower left direction on the paper surface of FIG. 5). At this time, if the gap between the optical unit 110 and the bottom surface 22c of the storage unit 22 is large, the optical unit 110 is likely to deform significantly toward the gap. Therefore, by providing a convex portion 22f that fills the gap, unintended deformation (turning, etc.) of the optical unit 110 is suppressed.

A method of using the injector 1 (intraocular lens insertion device) of the first embodiment will be described. In the injector 1, the storage section 22 is pre-filled with an intraocular lens 100. When the user pushes the push-out section formed at the base end of the plunger 12 to move the entire plunger 12 forward, the intraocular lens 100 tacked by the rear support section 112B is pushed out along the central axis Lt (which is also the push-out axis Lp in the push-out direction of the plunger 12). At this time, the rear support section 112B slides through the second gap S2 on the second restricting section 42, and the tip section 118B passes through the first gap S1 on the first restricting section 41. Therefore, the rear support section 112B is unlikely to come into contact with the inner wall of the storage section 22 during tacking, and the tip section 118B is unlikely to bend toward the base end side of the push-out axis Lp. This allows the rear support part 112B to be tacked appropriately even when the intraocular lens 100 as a whole becomes soft and easily deformed, for example, when the room temperature is high. When the plunger 12 is further pushed out, the front support part 112A also tacks onto the front optical surface 110c of the optical part 110, and then the entire optical part 110 is deformed into a roll shape and the intraocular lens 100 is ejected from the insertion port.

Second Embodiment
Next, a second embodiment, which is one of typical embodiments of the present disclosure, will be described with reference to the drawings. In describing an injector 201 of the second embodiment, components substantially similar to those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof may be omitted.

In the second embodiment, as shown in Figs. 9 to 11, the visor 50 is provided. The visor 50 is in a form in which the first restricting portion 41 and the second restricting portion 42 are each extended in the circumferential direction of the optical portion 110 while maintaining the brim shape and are connected to each other. The visor 50 is disposed on the base end side of the extrusion axis Lp from the imaginary plane Vs that is perpendicular to the extrusion axis Lp and includes the optical axis L. The visor 50 is provided with a slope 52 (see Fig. 11) for sliding the rear support portion 112B in the process of the tip of the rear support portion 112B being deformed to a position facing the front optical surface 110c. Between the visor 50 and the ceiling surface 22b (ceiling inner wall), a third gap S3 is provided through which the tip portion 118B of the rear support portion 112B, which is deformed to a position facing the front optical surface 110c, can pass. The third gap S3 has the same gap interval as the first gap S1 and the second gap S2. The canopy 50 also has a protrusion 54 (see FIG. 10) that protrudes toward the bottom surface 22c on the surface facing the front optical surface 110c. The protrusion 54 prevents the optical part 110 from sticking to the canopy 50. The injector 201 of the second embodiment also has the configuration of the convex part 22f.

Here, for example, consider the case where only the second restricting portion 42 in the first embodiment is configured. As shown in FIG. 12, if the optical portion 110 is shifted forward from the predetermined position during tacking, the second restricting portion 42 cannot support the tip portion 118B of the rear support portion 112B, and the tip portion 118B of the rear support portion 112B hangs down to the outer peripheral portion 110a of the optical portion 110, and the tip portion 118B is likely to contact the outer peripheral portion 110a (side surface of the optical portion 110). As described above, when the room temperature is high, the rear support portion 112B becomes soft, so that the rear support portion 112B is more likely to hang down, and such contact is more likely to occur. On the other hand, as shown in FIG. 13, the canopy 50 in the second embodiment is configured to support the entire rear support portion 112B, so that the tip portion 118B is configured to reliably pass over the canopy 50. As a result, for example, even if the optical portion 110 is misaligned from a predetermined position, the tip portion 118B of the rear support portion 112B is unlikely to come into contact with the side of the optical portion 110.

A method of using the injector 201 (intraocular lens insertion device) of the second embodiment will be described. In the injector 201, the storage section 22 is pre-filled with the intraocular lens 100. When the user pushes the push-out section formed at the base end of the plunger 12 to move the entire plunger 12 forward, the intraocular lens 100 to which the rear support section 112B is tacked is pushed out along the central axis Lt (which is also the push-out axis Lp in the push-out direction of the plunger 12). At this time, the rear support section 112B slides along the slope 52 (see FIG. 11) of the canopy 50 and passes through the third gap S3. Here, since the canopy 50 is configured to support the entire rear support section 112B, the rear support section 112B is unlikely to come into contact with the inner wall of the storage section 22 during tacking, and the tip section 118B is unlikely to bend toward the base end side of the push-out axis Lp. This allows the rear support portion 112B to be tacked appropriately even when the entire intraocular lens 100 becomes soft and easily deformed, for example, when the room temperature is high. In addition, when the rear support portion 112B is tacked, if a viscoelastic material is present, the resistance of the viscoelastic material may cause the tip portion 118B to bend toward the bottom surface 22c. However, since the canopy 50 is configured to support the entire rear support portion 112B, it is unlikely that only the tip portion 118B will bend toward the bottom surface 22c due to the resistance of the viscoelastic material. The canopy 50 can suppress tacking failure of the rear support portion 112B, which is deformed to a position facing the front optical surface 110c. When the plunger 12 is further pushed out, the front support portion 112A is also tacked onto the front optical surface 110c of the optical portion 110, and the entire optical portion 110 is deformed into a roll shape, and the intraocular lens 100 is ejected from the insertion port.

In addition, in the first and second embodiments, the names "bottom surface 20e", "ceiling surface 22b", "bottom surface 22c", etc. are for convenience and do not strictly define the up-down direction of the injector 1. For example, the bottom surface 20e is not always located below the intraocular lens 100. In other words, the up-down direction of the injector 1 may change during transportation, when the injector 1 is filled with a viscoelastic substance, when the intraocular lens 100 is inserted into the eye, etc. In addition, the front optical surface 110c (first optical surface) and the rear optical surface 110b (second optical surface) in the first and second embodiments may be reversed. In other words, the optical surface designated as the front optical surface 110c in the first and second embodiments may be the rear optical surface 110b.

Thus, according to the injector 1, 201 (intraocular lens insertion device) according to the first and second embodiments of the present disclosure, since it has the first restricting portion 41 or the canopy 50, it is possible to restrict the outer peripheral portion 110a (edge) of the optical portion 110 of the intraocular lens 100 stored in the storage portion 22, which is the farthest from the extrusion axis Lp, from moving in a direction parallel to the optical axis L (Z-axis direction in FIG. 5). Also, the first restricting portion 41 or the canopy 50 is configured in a brim shape extending from the right side inner wall 22d side, which is the side of the inner wall of the storage portion 22 on which the root portion 116B of the rear support portion 112B is not disposed, to a position facing a part of the front optical surface 110c of the optical portion 110, and a first gap S1 and a third gap S3 are provided between the first restricting portion 41 and the ceiling surface 22b (ceiling inner wall). Therefore, when the rear support part 112B tacks, the tip part 118B passes through the first gap S1 and the third gap S3, allowing for suitable tacking. This allows for both restricting the movement of the intraocular lens 100 during storage and suitable tacking of the rear support part 112B during ejection.

The second restricting portion 42 restricts the movement of the outer peripheral portion 110a (edge) of the optical portion 110 of the intraocular lens 100 stored in the storage portion 22 at the base end side of the extrusion axis Lp in the direction of the optical axis L. The second restricting portion 42 is configured in a brim shape extending in the in-plane direction (perpendicular to the optical axis L) of the optical surface (front optical surface 110c, rear optical surface 110b) of the optical portion 110 from the base end side of the extrusion axis Lp to a position facing a part of the front optical surface 110c. Between the second restricting portion 42 and the ceiling surface 22b (ceiling inner wall), a second gap S2 is provided through which the tip portion 118B of the rear support portion 112B, which is deformed to a position facing the front optical surface 110c, can pass. The configuration of the second restricting portion 42 allows the rear support portion 112B to be tacked more appropriately.

The canopy 50 is configured such that the first restricting portion 41 and the second restricting portion 42 each extend circumferentially around the optical portion 110 while maintaining a brim shape. This allows the functions of the first restricting portion 41 and the second restricting portion 42 of the canopy 50 to be linked, making it easier to tuck the entire rear support portion 112B up to the front optical surface 110c.

The first restricting portion 41 and the canopy 50 are disposed on the base end side of the extrusion axis Lp relative to an imaginary plane Vs that is perpendicular to the extrusion axis Lp and includes the optical axis L. This makes it possible to suppress interference with the first restricting portion 41 when the entire intraocular lens 100 is advanced after the rear support portion 112B is tacked, making it difficult for unintended deformation of the intraocular lens 100 to occur.

The canopy 50 is also formed with a slope 52 for sliding the rear support portion 112B during the process of deformation of the tip portion 118B of the rear support portion 112B to a position facing the front optical surface 110c. The slope 52 allows the rear support portion 112B to be tucked smoothly.

The intraocular lens 100 also has a pair of front support parts 112A and rear support parts 112B extending radially outward from the outer periphery of the optical part 110, and the insertion instrument body 10 (cylindrical body) is provided with a convex part 22f that suppresses tilting of the optical part 110 when the pre-filled intraocular lens 100 is pushed out by the plunger 12. The convex part 22f is disposed in a position facing the outer periphery of the optical part 110, forward of the optical axis L of the optical part 110, and on the side where the front support part 112A is not disposed as viewed from the extrusion axis Lp. The convex part 22f protrudes in an arched shape from the bottom surface 22c of the insertion instrument body 10 toward the ceiling surface 22b, and is close to the outer periphery of the optical part 110 on the side of the rear optical surface 110b, and has a rounded fillet processing applied to its tip. The protrusion 22f can suppress the inclination of the optical part 110 when the intraocular lens 100 is pushed out by the plunger 12, and can suppress the occurrence of a so-called "back tacking state" in which the front support part 112A of the intraocular lens 100 is unintentionally tacked. In addition, deformation of the optical part 110, such as unintentional curling, can be suppressed.

Although the embodiments of the present disclosure have been described above, the intraocular lens insertion device of the present disclosure is not limited to the above embodiments and can be implemented in various other forms.

1. Injector (intraocular lens insertion device)
10 Insertion instrument body 12 Plunger 20 Insertion section 20a Tip 20b Passage 20c Inner wall surface 20e Bottom surface 24a First inner wall surface 24b Second inner wall surface 22 Storage section 22b Ceiling surface 22c Bottom surface 22d Right inner wall 22e Left inner wall 22f Convex portion 31 First pin 32 Second pin 33 Third pin 41 First restricting portion 42 Second restricting portion 43 Third restricting portion 50 Canopy 52 Slope 100 Intraocular lens 110 Optical portion 110a Outer periphery (edge)
110b Rear optical surface 110c Front optical surface 112A Front support part 114A Connection part 116A Root part 118A Tip part 112B Rear support part 114B Connection part 116B Root part 118B Tip part L Optical axis Lp Extrusion axis Lt Central axis S1 First gap S2 Second gap S3 Third gap Vs Virtual plane

Claims (4)

An intraocular lens insertion device that stores an intraocular lens having a disk-shaped optical part and a pair of support parts extending radially outward from an outer periphery of the optical part on a push-out shaft inside a cylindrical body in advance, and pushes the stored intraocular lens from a base end side to a tip end side along the push-out shaft with a rod-shaped plunger to insert the intraocular lens into a patient's eye,
The cylindrical body includes:
a storage section in which the intraocular lens is stored such that a front support section, which is one of the support sections, is disposed on the distal end side of the optical section, and a rear support section, which is the other support section, is disposed on the proximal end side of the optical section;
a first restriction portion provided in the storage portion and restricting a peripheral edge of the optical portion of the intraocular lens stored in the storage portion that is farthest from the extrusion axis from moving in a direction parallel to the optical axis;
the first restricting portion is configured in a brim shape extending from a side inner wall side, which is a side on which a base of the rear support portion is not disposed, of an inner wall of the storage portion facing a direction intersecting the extrusion axis in an in-plane direction of the optical surface of the optical portion, to a position facing a part of a front optical surface of the optical portion,
a first gap is provided between the first restricting portion and a ceiling inner wall of the inner wall of the storage portion facing the front optical surface, through which a tip end of the rear support portion deformed to a position facing the front optical surface can pass;
a second restriction portion that restricts a peripheral edge of the optical portion of the intraocular lens stored in the storage portion on a base end side of the push-out shaft from moving in a direction parallel to the optical axis,
the second restricting portion is configured in a flange shape extending in an in-plane direction of an optical surface of the optical portion from a base end side of the extrusion shaft to a position facing a part of the front optical surface,
An intraocular lens insertion device, wherein a second gap is provided between the second restricting portion and the ceiling inner wall, through which the tip of the rear support portion, which is deformed to a position facing the front optical surface, can pass. 2. The intraocular lens insertion device according to claim 1,
An intraocular lens insertion device in which the first and second restricting portions are connected to each other while maintaining a flange shape and extending in a circumferential direction of the optical portion. The intraocular lens insertion device according to claim 1 or 2,
The first regulating portion is disposed on the proximal end side of the push-out shaft relative to an imaginary plane that is perpendicular to the push-out shaft and includes the optical axis. 3. The intraocular lens insertion device according to claim 2 ,
An intraocular lens insertion device, in which the connected first and second control portions have a slope formed thereon for sliding the rear support portion during the process of the tip of the rear support portion being deformed to a position facing the front optical surface.

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