JP7088852B2 - Injector for intraocular lens - Google Patents

Description

The present invention relates to an intraocular lens injector provided with a tip that discharges the intraocular lens while folding the intraocular lens in a concave shape by pushing the plunger.

An injector for an intraocular lens for inserting an intraocular lens into the eye is known as a prior art (Patent Document 1). The injector for an intraocular lens described in Patent Document 1 is inserted into a lens holder for holding an intraocular lens, a device main body to which the lens holder is attached, and the device main body so as to be retractable, and abuts on the intraocular lens. It is equipped with a plunger that pushes out the intraocular lens and a tip that is connected to the main body of the device and ejects the intraocular lens while folding the intraocular lens in a concave shape by pushing the plunger. The tip has a nozzle portion in which a passage hole whose inner diameter gradually decreases as it advances forward, and a discharge portion in which an intraocular lens that has passed through the passage hole is discharged.

When the plunger is pushed into the main body of the device, the intraocular lens is folded in a concave shape while passing through a passage hole formed in the nozzle portion. Then, the intraocular lens reaches the emission portion in a folded state. The intraocular lens that has reached the discharge portion is inserted into the eye through the discharge port of the discharge portion.

Japanese Patent Publication "Japanese Patent Laid-Open No. 2014-140711"

In the above-mentioned conventional technique, the intraocular lens is inserted into the eye from the discharge port of the discharge portion in a state where the intraocular lens is concavely folded along the inner wall of the passage hole whose inner diameter gradually decreases as it advances forward. Will be inserted. This intraocular lens can be folded in various ways along the inner wall of the passage hole, and there is room for improvement from the viewpoint that the intraocular lens is stably inserted into the eye from the ejection portion.

One aspect of the present invention is to realize an injector for an intraocular lens capable of stably ejecting an intraocular lens into the eye.

In order to solve the above problems, the injector for an intraocular lens according to one aspect of the present invention is attached to the end face side of the tubular main body and is held by a lens holder for holding the intraocular lens and the lens holder. A plunger that abuts on the intraocular lens and pushes out the intraocular lens, and a passage formed so as to approach the tip side in order to fold the intraocular lens pushed out by the plunger and release it from the tip side. It comprises a tip with a hole, and the passage hole is characterized by having a stopper protrusion that prevents the advance of the intraocular lens folded in a mountain-folded manner by the inner wall of the passage hole that narrows as it approaches the tip side. do.

According to one aspect of the present invention, there is an effect that an injector for an intraocular lens capable of stably ejecting an intraocular lens into the eye can be realized.

(A) is a perspective view showing an overall configuration of an intraocular lens injector according to an embodiment, and (b) is a perspective of an intraocular lens held inside a lens holder provided in the intraocular lens injector. It is a figure. (A) is a plan view showing a main part of a lens holder provided in the injector for an intraocular lens, (b) is a perspective view showing a main part of the lens holder, and (c) is (a). It is a cross-sectional view along the cross section GG shown in. It is a top view which shows the tip and the lens holder provided in the injector for an intraocular lens. (A) is a plan sectional view for explaining the regulation of the plunger by the outlet of the apparatus main body provided in the injector for the intraocular lens, and (b) is a perspective view for explaining the regulation of the plunger. .. (A) is a perspective view for explaining the regulation of the plunger by the lens holder, and (b) is a cross-sectional view for explaining the regulation of the plunger. (A) is a perspective view for explaining other regulation of the plunger by the lens holder, and (b) is a sectional view for explaining other regulation of the plunger. (A) is a plan sectional view for explaining the regulation of the plunger by the groove of the passage hole formed in the tip, and (b) to (f) are cross sections from the cross sections AA shown in (a), respectively. It is sectional drawing along with EE. (A) is a plan sectional view for explaining the regulation of the plunger by the width of the passage hole, (b) is a sectional view along the sectional FF shown in (a), and (c) is a comparison. It is a top sectional view for demonstrating the regulation of the plunger by the width of the passage hole which concerns on an example. (A) is a plan view for explaining a guide protrusion provided on the lens holder, and (b) is a plan view for explaining a lens holder according to a comparative example. It is sectional drawing along the axial direction of the said tip tip for demonstrating the stopper protrusion provided in the said tip tip. (A) is a cross-sectional view taken along the direction perpendicular to the axial direction of the tip tip for explaining the stopper protrusion, and (b) is for explaining the protrusion provided on the tip tip according to the comparative example. It is sectional drawing which follows the direction perpendicular to the axial direction. (A) is a plan view showing the tip shape of the plunger, (b) is a side view showing the tip shape of the plunger, and (c) is another perspective view showing the tip shape of the plunger. (A) is a plan view showing the tip shape of the plunger according to the comparative example, (b) is a side view showing the tip shape of the plunger, and (c) is another perspective view showing the tip shape of the plunger. Is.

Hereinafter, embodiments of the present invention will be described in detail.

(Overall configuration of injector 1 for intraocular lens)
FIG. 1A is a perspective view showing the overall configuration of an intraocular lens injector 1 (hereinafter, may be simply referred to as an injector 1) according to an embodiment, and FIG. 1B is an intraocular lens injector 1. It is a perspective view of the intraocular lens 7 held inside the provided lens holder 4. As shown in FIG. 1, the injector 1 includes a cylindrical device main body 2, a tip tip 3, a lens holder 4 for holding an intraocular lens 7 inside, and a plunger 5. The tip 3 has a nozzle portion 32 connected to the apparatus main body 2 and a discharge portion 31 provided on the front side of the nozzle portion 32. Further, the lens holder 4 can be attached to the apparatus main body 2. Further, the plunger 5 has a rod shape and is configured to be inserted into the apparatus main body 2.

Here, the axial core direction of the plunger 5 is the front-rear direction. Further, the AY direction shown in FIG. 2C is the vertical direction, and the AX direction is the horizontal direction. Further, the tip 3 side of the injector 1 is the front side, and the opposite side is the rear side.

(Intraocular lens 7)
Here, the intraocular lens 7 includes a lens portion 7a, a front support portion 7b, and a rear support portion 7c. The lens portion 7a is a lens portion that functions as a crystalline lens after being inserted into the eye. The anterior support portion 7b and the posterior support portion 7c are formed so as to extend in a curved shape from the side surface of the lens portion 7a, and have a function of supporting the lens portion 7a in the eye after intraocular insertion. The front support portion 7b and the rear support portion 7c are arranged so as to have a point-symmetrical positional relationship with the center of the lens portion 7a as the center of symmetry. The lens portion 7a, the front support portion 7b, and the rear support portion 7c are made of an elastic material and are formed to be deformable.

In the present embodiment, a single-piece type in which the lens portion 7a, the front support portion 7b, and the rear support portion 7c are integrally molded will be described as an example. However, the present invention is not limited to this. The present invention can also be applied to a three-piece type intraocular lens in which the lens portion 7a, the front support portion 7b, and the rear support portion 7c are composed of different members.

(Plunger guide 79 of lens holder 4)
2A is a plan view showing a main part of a lens holder 4 provided in an injector 1 for an intraocular lens, FIG. 2B is a perspective view showing a main part of the lens holder 4, and FIG. 2C is a perspective view showing the main part of the lens holder 4. It is sectional drawing which follows the sectional | cross-section GG shown in (a).

The apparatus main body 2 has a bottom portion 21 (FIG. 2 (c)) to which the tip tip 3 and the lens holder 4 are engaged in the front, a plurality of annular protrusions 22 that can be grasped by the operator on the outer surface of the front end, and a rear end. The outer surface of the lens has a collar-shaped holding portion 23 that the surgeon holds with his / her finger. The device main body 2 is formed by using a resin such as polycarbonate having impact resistance.

The annular protrusion 22 and the holding portion 23 may have any shape as long as they can exhibit the required functions. For example, the holding portion 23 may be formed not in the shape of a brim but by a protrusion or the like on which a finger can be hung.

While pushing the plunger 5 with one hand, the surgeon grasps the annular protrusion 22 with the other hand, and holds the intraocular lens 7 in the order of the anterior support portion 7b, the lens portion 7a, and the posterior support portion 7c. It is released into the patient's eye. By providing the annular protrusion 22, it becomes easier for the operator to grip the injector 1, and the operability of the injector 1 can be improved.

The lens holder 4 has a bottom portion 41 on which a mounting surface 41a on which the intraocular lens 7 is mounted is formed, and a lid portion 42 provided so as to be openable and closable with respect to the bottom portion 41. 2 (a), (b) and (c) are drawn with the lid portion 42 omitted. In order to guide the plunger 5 that passes through the passage hole of the apparatus main body 2 to abut and push out the intraocular lens 7, a pair of plunger guides 79 that abut on the peripheral surface of the plunger 5 from the left and right in a V shape form a lens. A support protrusion 80 is formed on the bottom 41 of the holder 4 and abuts on the peripheral surface of the plunger 5 from below so as to project from the bottom 21 of the apparatus main body 2.

The support protrusion 80 suppresses blurring and wobbling along the downward direction of the plunger 5 passing through the passage hole of the apparatus main body 2 in order to abut and push out the intraocular lens 7. The pair of plunger guides 79 suppresses blurring and wobbling along the left-right direction, the upper left direction, and the upper right direction of the plunger 5 passing through the passage hole of the apparatus main body 2. When blurring or wobbling occurs along the left-right direction of the plunger 5, the position where the plunger 5 abuts on the intraocular lens 7 deviates from the center of the intraocular lens 7. Therefore, the intraocular lens 7 that is abutted and pushed out at a position deviated from the center rotates. The pair of plunger guides 79 suppresses the rotation of the intraocular lens 7 that is brought into contact with the plunger 5 and pushed out, and the intraocular lens 7 is suitably folded by the nozzle portion 32 (FIG. 1) of the tip tip 3 to release the intraocular lens 7. Emitted from 31.

(Passing hole 87 of the device main body 2)
FIG. 3 is a plan view showing a tip tip 3 and a lens holder 4 provided in the injector 1 for an intraocular lens. FIG. 4A is a plan sectional view for explaining the regulation of the plunger 5 by the outlet 88 of the apparatus main body 2 provided in the injector 1 for the intraocular lens, and FIG. 4B is for explaining the regulation of the plunger 5. It is a perspective view of.

The plunger 5 is inserted into the passage hole 87 formed in the substantially cylindrical device main body 2 along the axial direction. The plunger 5 that has passed through the outlet 88 of the passage hole 87 abuts on the intraocular lens 7 and pushes the intraocular lens 7 from the lens holder 4 to the tip tip 3. The position of the plunger 5 in the left-right direction is regulated by the shape of the outlet 88 of the passage hole 87. The shape of the outlet 88 of the passage hole 87 is a circular shape having a diameter larger than the cross-sectional shape perpendicular to the axis of the plunger 5. The outlet 88 of the passage hole 87 is arranged in the region R1 shown in FIG.

(Regulatory grooves 81 and 82 of the lens holder 4)
FIG. 5A is a perspective view for explaining the regulation of the plunger 5 by the lens holder 4, and FIG. 5B is a cross-sectional view for explaining the regulation of the plunger 5. A regulation groove 81 for restricting blurring and wobbling along the left-right direction and the downward direction of the plunger 5 is formed in the bottom portion 41 of the lens holder 4 along the front-rear direction. A regulation groove 82 for restricting blurring and wobbling along the left-right direction and the upward direction of the plunger 5 is formed on the lid portion 42 of the lens holder 4 along the front-rear direction. The intraocular lens 7 extruded by the plunger 5 is placed in a bowl-shaped recess 84 formed in the bottom 41. The regulation groove 81 is formed so as to be connected to the recess.

When the lid portion 42 is closed, the plunger 5 that has passed through the apparatus main body 2 is restricted in the vertical direction and the horizontal direction by the regulation grooves 82 and 81. The regulating grooves 82 and 81 are arranged in the region R2 shown in FIG.

(Regulatory groove 83 of lens holder 4)
FIG. 6A is a perspective view for explaining other restrictions of the plunger 5 by the lens holder 4, and FIG. 6B is a cross-sectional view for explaining other restrictions of the plunger 5. A regulation groove 83 for restricting blurring and wobbling along the left-right direction and the downward direction of the plunger 5 is formed along the front-rear direction on the tip 3 side of the bottom portion 41 of the lens holder 4.

When the lid portion 42 is closed, the plunger 5 that has passed through the recess 84 of the bottom portion 41 is restricted in the downward direction and the left-right direction by the regulation groove 83. The regulation groove 83 is arranged in the region R3 shown in FIG.

(Regulatory groove 85 of tip tip 3)
FIG. 7A is a plan sectional view for explaining the regulation of the plunger 5 by the regulation groove 85 of the passage hole 75 formed in the tip tip 3, and FIGS. 7B to 7F are shown in FIG. 7A, respectively. It is sectional drawing from the cross section AA to the cross section EE. The tip tip 3 has a passage hole 75 formed so as to narrow toward the tip side in order to fold the intraocular lens 7 extruded by the plunger 5 and release it from the tip side. A regulation groove 85 for restricting the plunger 5 that has passed through the lens holder 4 is formed on the inner wall below the passage hole 75 in the front-rear direction. The regulating groove 85 is arranged in the region R4 shown in FIG. As a result, blurring and wobbling along the downward and left-right directions of the plunger 5 are regulated.

(Width of passage hole 75)
FIG. 8A is a plan sectional view for explaining the regulation of the plunger 5 by the width of the passage hole 75, FIG. 8B is a sectional view taken along the sectional view FF shown in FIG. 8A, and FIG. 8C is shown in FIG. Is a plan sectional view for explaining the regulation of the plunger by the width of the passage hole according to the comparative example. The passage hole 75 is formed so that the dimension in the left-right direction becomes smaller first and then the dimension in the vertical direction becomes smaller as the nozzle portion 32 approaches the tip end side. Therefore, the left-right blurring and wobbling of the plunger 5 traveling in the passage hole 75 toward the tip of the nozzle portion 32 are promptly regulated after the plunger 5 enters the passage hole 75.

(Guide protrusion 74 of the lens holder 4)
FIG. 9A is a plan view for explaining the guide protrusion 74 provided on the lens holder 4, and FIG. 9B is a plan view for explaining the lens holder 94 according to the comparative example. On the tip 3 side of the lid 42 of the lens holder 4, a guide protrusion 74 for folding the intraocular lens 7 in a valley fold mode is formed by the inner wall of the passage hole 75 that narrows as it approaches the tip side.

When the lid 42 is closed, the intraocular lens 7 pushed out from the lens holder 4 into the passage hole 75 by the plunger 5 is guided by a guide protrusion 74 protruding downward from the upper side at the entrance of the passage hole 75 where it begins to be folded. It is folded into a valley fold mode that curves downward along the inner wall of the passage hole 75 that narrows as it approaches the tip side. In this way, the guide protrusion 74 acts on the intraocular lens 7 as an obstacle, so that the intraocular lens 7 is folded in a mountain-folding manner so as to be convex upward along the inner wall of the passage hole 75. Is prevented. Therefore, the intraocular lens 7 is always folded in a certain manner. In the intraocular lens 7, the anterior support portion 7b usually needs to be ejected to the left from the emission portion 31. However, when folded in a mountain-folded manner, on the contrary, there is a problem that the front support portion 7b faces to the right and the intraocular lens 7 is ejected from the emission portion 31.

The lens holder 94 according to the comparative example shown in FIG. 9B is not provided with the guide protrusion 74. Therefore, the intraocular lens 7 can be folded in a mountain-folded manner. By providing the guide protrusion 74 as shown in FIG. 9A, the intraocular lens 7 is always folded in a certain manner, so that the intraocular lens 7 is always discharged from the emitting unit 31 in a stable manner.

A recess formed along the outer peripheral surface of the plunger 5 is provided at the tip of the guide protrusion 74 projecting downward from the upper side. Therefore, the guide protrusion 74 regulates blurring and wobbling along the upward and left-right directions of the plunger 5 while controlling the folding mode of the intraocular lens 7.

In the present embodiment, in order to fold the intraocular lens 7 in a valley fold mode, an example is described in which a guide protrusion 74 projecting downward from the upper side is provided at the entrance of the passage hole 75, but the present invention has been described. Not limited to this. The intraocular lens 7 may always be folded in a certain manner. Therefore, for example, in order to fold the intraocular lens 7 in a mountain-folding manner, a guide protrusion protruding upward from the lower side may be provided at the entrance of the passage hole 75.

(Stopper protrusion 71 of tip tip 3)
FIG. 10 is a cross-sectional view taken along the axial direction of the tip tip 3 for explaining the stopper protrusion 71 provided on the tip tip 3. The passage hole 75 formed so as to be narrowed as it approaches the discharge portion 31 in order to discharge the intraocular lens 7 extruded by the plunger 5 from the discharge portion 31 on the distal end side is mountain-folded by the inner wall of the passage hole 75. It has a stopper protrusion 71 that prevents the progress of the intraocular lens 7 folded in the eye. The stopper protrusion 71 is formed on the inner wall above the passage hole 75 along the front-rear direction. The stopper protrusion 71 is formed from an intermediate point between the inlet and the outlet of the passage hole 75 to the outlet.

When the intraocular lens 7 extruded into the passage hole 75 is folded in a valley fold mode, the intraocular lens 7 is pushed by the plunger 5 to pass through the passage hole 75 and is discharged from the discharge portion 31. However, when the intraocular lens 7 extruded into the passage hole 75 is folded in a mountain-folded manner at the entrance of the passage hole 75, the intraocular lens 7 pushed by the plunger 5 hits the stopper protrusion 71 and is prevented from proceeding. .. In this way, the emission from the emission portion 31 of the intraocular lens 7 folded in the mountain-folded manner is prevented. As a result, the intraocular lens 7 is always folded in a valley-folded manner and is discharged from the discharging unit 31.

In the present embodiment, an example in which the stopper protrusion 71 for preventing the advance of the intraocular lens 7 folded in the mountain-folded manner is provided has been described, but the present invention is not limited thereto. The intraocular lens 7 may always be folded in a certain manner. Therefore, for example, a stopper protrusion may be provided to prevent the progress of the intraocular lens 7 folded in the valley fold mode.

FIG. 11A is a cross-sectional view taken along a direction perpendicular to the axial direction of the tip tip 3 for explaining the stopper protrusion 71, and FIG. 11B shows a protrusion 91 provided on the tip tip 93 according to a comparative example. It is sectional drawing along the direction perpendicular to the said axial direction for demonstrating.

The stopper protrusion 71 forms a step with respect to the gentle slope 72 formed along the front-rear direction and gently inclined with respect to the inner wall of the passage hole 75, and the stopper protrusion 71 formed along the front-rear direction with respect to the inner wall of the passage hole 75. It has a stepped surface 73. The intraocular lens 7 is folded along the inner wall of the passage hole 75 in such a manner that one end side and the other end side overlap each other. In the mode in which the intraocular lens 7 is folded, one end side is folded so as to be wound inside the other end side, and conversely, the other end side is folded so as to be wound inside the other end side. There is an inner aspect. The intraocular lens 7 must always be emitted in the medial aspect at one end or always emitted in the medial aspect at the other end. However, in particular, when the intraocular lens 7 is a thin type, it may be folded in an unintended manner. Therefore, there is a problem that the behavior of the emitted intraocular lens 7 changes.

By forming the gentle slope 72 and the stepped surface 73 on the stopper protrusion 71, one end side of the intraocular lens 7 folded from the gentle slope 72 side is inside the other end side of the intraocular lens 7 folded from the stepped surface 73 side. The intraocular lens 7 is folded so that one end side and the other end side overlap each other so as to be wound around. Therefore, the intraocular lens 7 is always folded at one end in the medial manner. As a result, the behavior of the emitted intraocular lens 7 is always constant.

A protrusion 91 is also formed in the passage hole 75 of the tip tip 93 according to the comparative example shown in FIG. 11 (b). However, unlike the stopper protrusion 71, the protrusion 91 is arranged at the entrance of the passage hole 75, and is provided to suppress blurring and wobbling along the upward direction of the plunger 5.

(Notch 76 at the tip of the plunger 5)
12A is a plan view showing the tip shape of the plunger 5, FIG. 12B is a side view showing the tip shape of the plunger 5, and FIG. 12C is another perspective view showing the tip shape of the plunger 5. be. The tip of the plunger 5 has a pair of notches 76 for avoiding contact with the intraocular lens 7 folded in a valley-folded manner so as to overlap as the tip 3 approaches the tip side of the passage hole 75. Is formed. The pair of notched portions 76 cut out the upper left and right portions of the tip of the plunger 5, and the central portion is left.

13A is a plan view showing the tip shape of the plunger 95 according to the comparative example, FIG. 13B is a side view showing the tip shape of the plunger 95, and FIG. 13C shows the tip shape of the plunger 95 and the like. It is a perspective view of.

No notch is formed in the upper part of the tip of the plunger 95. Such a configuration has the following problems. When the intraocular lens 7 is folded by the passage hole 75 of the tip tip 3 and one end side and the other end side of the intraocular lens 7 overlap, one end side of the intraocular lens 7 that overlaps and is caught inside. Alternatively, the other end side may approach the plunger 95 and the plunger 95 may come into contact with the intraocular lens 7.

The cutout portion 76 is formed by cutting out a portion where one end side or the other end side of the intraocular lens 7 which overlaps and is caught inside may come into contact with each other. Therefore, by forming the notch portion 76, it is possible to prevent a situation in which one end side or the other end side of the intraocular lens 7 that overlaps and is caught inside comes into contact with the plunger 5.

〔summary〕
In order to solve the above problems, the injector for an intraocular lens according to one aspect of the present invention is attached to the end face side of the tubular main body and is held by a lens holder for holding the intraocular lens and the lens holder. A plunger that abuts on the intraocular lens and pushes out the intraocular lens, and a passage formed so as to approach the tip side in order to fold the intraocular lens pushed out by the plunger and release it from the tip side. It is provided with a tip having a hole, and has a stopper protrusion that prevents the intraocular lens from advancing when the passage hole is folded in a mountain-folded manner by the inner wall of the passage hole that narrows as it approaches the tip side.

As a result, the progress of the intraocular lens folded in a mountain-folded manner is prevented by the inner wall of the passage hole that narrows as it approaches the tip side. Therefore, only the intraocular lens folded in the valley fold mode is emitted from the tip side of the passage hole of the tip tip. Therefore, the direction in which the intraocular lens is emitted is always constant. As a result, the intraocular lens can be stably released into the eye.

In the injector for an intraocular lens according to one aspect of the present invention, the stopper protrusion is formed along the axial direction of the passage hole, and the stopper protrusion is formed along the axial direction and is gentle with respect to the inner wall. It is preferable to have a gentle slope that inclines toward the surface and a stepped surface that is formed along the axial direction and forms a step with respect to the inner wall.

With this configuration, one end side and the other end side overlap so that one end side of the intraocular lens folded from the gentle slope side is wound inside the other end side of the intraocular lens folded from the stepped surface side. The intraocular lens is folded. Therefore, the intraocular lens is always folded at one end in the medial manner. As a result, the behavior of the emitted intraocular lens is always constant.

In the intraocular lens injector according to one aspect of the present invention, a guide protruding toward the lens holder side of the passage hole in order to fold the intraocular lens in a valley fold mode by the inner wall of the passage hole narrowing as it approaches the tip side. It is preferable to further include protrusions.

With this configuration, the intraocular lens is guided by a guide projection and folded in a valley fold mode that curves downward along the inner wall of the passage hole. In this way, the guide protrusion acts on the intraocular lens as an obstacle to prevent the intraocular lens from being folded in a mountain-folding manner in which the intraocular lens is curved so as to be convex upward along the inner wall of the passage hole. .. Therefore, the intraocular lens is always folded in a certain manner.

In the injector for an intraocular lens according to one aspect of the present invention, the tip of the plunger has a notch for avoiding contact with an intraocular lens that is folded so as to overlap as it approaches the tip side of the tip. It is preferably formed in.

According to this configuration, the intraocular lens can be more preferably pushed out by the plunger without applying an excessive load to the intraocular lens folded so as to overlap.

In the injector for an intraocular lens according to one aspect of the present invention, the lens holder has a mounting portion on which the intraocular lens is mounted and a lid portion provided so as to cover the previously described mounting portion. It is preferable that the guide protrusion is formed on the lid portion.

According to this configuration, the intraocular lens can always be folded in a certain manner by a simple configuration.

In the injector for an intraocular lens according to one aspect of the present invention, the lens holder has a mounting portion on which a mounting surface on which the intraocular lens is mounted is formed, and the notch portion is the plunger. It is preferably formed on the side opposite to the previously described surface of the tip.

According to this configuration, the intraocular lens can be more preferably pushed out by the plunger without giving an excessive load to the intraocular lens folded in a valley-folded manner so as to overlap.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1 Injector (injector for intraocular lens)
3 Tip tip 4 Lens holder 2 Device body (main body)
5 Plunger 7 Intraocular lens 41 Bottom (mounting part)
41a Mounting surface 42 Cover 71 Stopper protrusion 72 Gentle slope 73 Step surface 74 Guide protrusion 75 Passage hole 76 Notch

Claims (5)

A lens holder that is attached to the end face side of the tubular body and holds the intraocular lens,
A plunger that abuts on the intraocular lens held by the lens holder and pushes out the intraocular lens,
It is provided with a tip having a passage hole formed so as to be narrowed as it approaches the tip side in order to fold the intraocular lens extruded by the plunger and release it from the tip side.
The passage hole has a stopper protrusion that prevents the advance of the intraocular lens that is folded in a mountain-folded manner by the inner wall of the passage hole that narrows as it approaches the tip side.
The stopper protrusion is formed along the axial direction of the passage hole, and is formed.
The stopper protrusion has a gentle slope formed along the axial direction and gently inclined with respect to the inner wall, and a stepped surface formed along the axial direction and forming a step with respect to the inner wall. An injector for an intraocular lens characterized by The intraocular lens according to claim 1, further comprising a guide protrusion protruding toward the lens holder side of the passage hole in order to fold the intraocular lens in a valley fold mode due to the inner wall of the passage hole narrowing toward the tip side. Injector. The intraocular according to claim 1 or 2, wherein a notch for avoiding contact with an intraocular lens folded so as to overlap as it approaches the tip side of the tip is formed at the tip of the plunger. Injector for lens. The lens holder has a mounting portion on which the intraocular lens is mounted and a mounting portion.
It has a lid portion provided so as to cover the above-mentioned resting portion, and has a lid portion.
The injector for an intraocular lens according to claim 2, wherein the guide protrusion is formed on the lid portion. The lens holder has a mounting portion on which a mounting surface on which the intraocular lens is mounted is formed.
The injector for an intraocular lens according to claim 3, wherein the notch is formed on the side opposite to the previously described placing surface of the tip of the plunger.

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