JP6777132B2 - Intraocular lens insertion device and intraocular lens insertion system - Google Patents

Description

The present invention relates to an intraocular lens insertion device and an intraocular lens insertion system for inserting a spectacle lens into the eye.

Conventionally, as one of the surgical methods for cataract, a method of removing the crystalline lens and then inserting an intraocular lens in place of the crystalline lens is generally used. A flexible intraocular lens is used to reduce the incision in the patient's eye that is provided to insert the intraocular lens, and a method of bending the intraocular lens into small pieces with an intraocular lens insertion device and inserting it into the eye is widely used. Has been done. As a flexible intraocular lens, an intraocular lens having an optical portion that provides the diopter of the patient's eye and a support portion that supports the optical portion in the eye is widely used.

As an intraocular lens insertion device for inserting a flexible intraocular lens into an eye, an intraocular lens insertion device for pushing out an intraocular lens by locking a support portion with an extrusion rod is known (Patent Document 1).

JP 2012-125355

However, in the intraocular lens insertion device of Patent Document 1, since the support portion is locked and pushed out above the extrusion rod, when the intraocular lens is ejected from the insertion portion, the tip of the extrusion rod is of the support portion and the capsular bag. Located in between. When pulling the extrusion rod back toward the cornea of the patient's eye, the support portion may get caught in the uneven shape of the extrusion rod, and the intraocular lens may move in an unintended direction. The operator had to move the tip of the extrusion rod toward the capsular bag, pull the extrusion rod sufficiently away from the support, and then pull the extrusion rod back toward the incision, which complicated the operation.

An object of the present invention is to provide an intraocular lens insertion device or an intraocular lens insertion system capable of easily ejecting an intraocular lens.

In order to solve the above problems, the present invention is characterized by having the following configurations.
(1) A tubular insertion portion having a deformable intraocular lens having an optical portion and a support portion extending outward from the peripheral portion of the optical portion and having the front surface directed toward the corneal lens in the eye, and an opening at the tip. An intraocular lens insertion device that inserts an intraocular lens into an eye by advancing a rod-shaped extrusion member in the direction of the tip of the extrusion shaft. The insertion portion includes a tubular tip portion extending in the tip direction and the tip portion of the tip portion. An insertion tube portion connected to the base end, the inner wall of which is formed in a tapered shape for slightly deforming the intraocular lens, and the tip portion for discharging the intraocular lens. The extrusion member is provided on the tip end side of the extrusion shaft and includes an opening provided at the tip thereof and formed in a shape cut diagonally when viewed from a direction orthogonal to the extrusion shaft. It is provided with an extrusion portion that pushes out the optical portion and a locking portion that is provided on the proximal end side of the extrusion portion and that faces the front side of the support portion and locks the support portion, and is on the side opposite to the front surface side. It is an opening end surface formed by inclining in a direction toward the rear surface side of the support portion, and the opening is formed by inclining in a direction in which the rear surface side of the support portion locked by the locking portion faces. It has an open end surface, and a notch is formed at the base end of the opening so as to be cut in a V shape toward the base end direction of the extrusion shaft, and the entire cut portion is larger than the insertion cylinder portion. It is formed on the tip side , and when the intraocular lens is inserted into the eye and then the intraocular lens insertion device is pulled back out of the eye by the locking portion, the extruded member is caught by the support portion. It is characterized by being made difficult .
(2) A deformable intraocular lens having an optical portion and a support portion extending outward from the peripheral portion of the optical portion and having the front surface directed toward the corneal side in the eye is pre-filled, and the intraocular lens is at the tip. An intraocular lens insertion system that inserts an intraocular lens into an eye by advancing a rod-shaped extrusion member toward the tip of the extrusion shaft into a tubular insertion portion having an opening, wherein the insertion portion has a tubular shape extending toward the tip. The tip portion, the insertion tube portion connected to the base end of the tip portion, and the insertion tube portion whose inner wall is formed in a tapered shape for slightly deforming the intraocular lens, and the intraocular lens. The extrusion member is provided with an opening provided at the tip of the tip portion for discharging and formed in a shape cut diagonally when viewed from a direction orthogonal to the extrusion axis. An extruded portion provided on the tip end side of the shaft to push out the optical portion, and a locking portion provided on the proximal end side of the extruded portion to face the front surface side of the support portion and lock the support portion. The opening end surface is formed so as to be inclined in a direction toward the rear surface side of the support portion, which is the side opposite to the front surface side, and the opening portion is the rear surface of the support portion locked by the locking portion. It has an opening end surface that is formed so as to be inclined in the direction facing the side, and a notch portion that is cut in a V shape toward the base end direction of the extrusion shaft is formed at the base end of the opening. When the entire notch is formed on the tip side of the insertion tube portion and the locking portion allows the intraocular lens to be inserted into the eye and then pulled back out of the eye. The extruded member is made difficult to be caught by the support portion .

According to the present invention, it is possible to provide an intraocular lens insertion device or an intraocular lens insertion system capable of easily ejecting an intraocular lens.

It is a perspective view of the intraocular lens insertion device of this embodiment seen from diagonally above. It is a perspective view of the intraocular lens insertion device of FIG. 1 viewed from diagonally below. It is a perspective view from diagonally below with the set member open. It is a perspective view which looked at the plunger from diagonally below. It is a figure which shows the vicinity of the tip of a plunger, is (a) bottom view, (b) left side view. It is a figure of the intraocular lens used in this embodiment, (a) a plan view, (b) a side view. It is the figure which mounted the intraocular lens on the mounting part, is (a) bottom view, (b) the cross-sectional view of the state seen from the side surface. It is sectional drawing of the mounting part at the time of starting the insertion. (A) is a cross-sectional view of a deformation mechanism provided in the insertion portion, and (b) is a bottom view showing a folded intraocular lens. It is a perspective view of the state in which the intraocular lens is ejected. It is a figure which shows the 1st transformation example of the locking part, and is the cross-sectional view seen from the tip side of the extruded member. It is a figure which shows the 2nd transformation example of the locking part, and is the cross-sectional view seen from the tip side of the extruded member.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the direction of the tip portion 122 of the main body 100 (lower left side of the paper surface in FIG. 1) is the tip direction (front), and the direction of the pressing portion 220 of the plunger 200 (upper right side of the paper surface in FIG. 1) is the base end. It is explained as the direction (backward). Further, the upper side, the lower side, the diagonally lower right side, and the diagonally upper left side of the paper surface in FIG. 1 are described as upper, lower, right, and lower parts of the intraocular lens insertion device 10, respectively.

Further, in the intraocular lens insertion device 10 of the present embodiment, the orientation when pushing the intraocular lens 1 forward (see FIG. 1) and the orientation when filling the intraocular lens 1 (see FIG. 2) are reversed up and down. It is used in the state of being used.

The intraocular lens insertion device 10 of the present embodiment shown in FIG. 1 is used to deliver the deformable intraocular lens 1 into the eye. FIG. 1 is a diagram showing a vertical direction of an intraocular lens insertion device 10 held by an operator or an assistant when the filling of the intraocular lens 1 is completed and the intraocular lens 1 is started to be extruded. Further, FIG. 2 is a diagram showing the vertical direction of the intraocular lens insertion device 10 which is grasped by the operator or an assistant when the intraocular lens 1 is filled in the intraocular lens insertion device 10. In the intraocular lens insertion device 10 of the present embodiment, the intraocular lens is inserted in the vertical direction when the intraocular lens 1 is filled, as opposed to the vertical direction when the intraocular lens 1 is started to be extruded. It reverses with respect to the extrusion shaft A of the instrument 10.

The intraocular lens insertion device 10 includes a main body 100 and a plunger 200. The main body 100 is a tubular member, and the intraocular lens 1 is bent into small pieces. The plunger 200 is a rod-shaped member for pushing out the intraocular lens 1, and is attached to the main body 100 as a means for pushing out the intraocular lens 1 so as to move forward and backward.

Since the main body 100 and the plunger 200 of the intraocular lens insertion device 10 of the present embodiment are made of a resin material, they can be easily discarded after use. The intraocular lens insertion device 10 may be molded by molding, cutting by cutting out a resin, or the like. By being formed of a resin material, the manufacturing cost of the intraocular lens insertion device 10 can be reduced, and the device can be provided to the user at a low cost.

In the intraocular lens insertion device 10 of the present embodiment, a lubricating coating treatment is applied to the tubular inner wall of the main body 100 in order to extrude the sticky and soft intraocular lens 1. The set member 146 is formed with a rough surface on a part of the surface instead of being subjected to the lubrication coating treatment. Further, the intraocular lens insertion device 10 of the present embodiment is formed to be colorless and transparent.
<Main body>

Further, the main body 100 includes an insertion portion 120 and a mounting portion 140. The insertion portion 120 includes a substantially cylindrical insertion cylinder portion 124 having an open tip portion 122 at the tip. The mounting portion 140 closes the mounting surface 142 on which the intraocular lens 1 before extrusion is placed, the opening 144 in which the opening for placing the intraocular lens 1 on the mounting surface 142 is formed, and the opening 144. A plate-shaped set member 146 that can be opened and closed is provided (see FIG. 3).

The tip portion 122 is an inclined surface inclined with respect to a surface orthogonal to the extrusion axis A, and is formed as an opening end surface 123 inclined in the direction of the rear surface 2B of the optical portion 2 of the intraocular lens 1 on which the intraocular lens 1 is placed. have. In other words, the bevel is formed so that the opening end surface 123 faces the rear surface 2B side of the intraocular lens 1 (lower side in the intraocular lens insertion device 10). Further, a notch 121 cut in a V shape in the direction of the base end is formed at the base end portion of the opening end surface 123.

The opening end surface 123 may be formed so as to be inclined in the direction in which the locking portion 282 faces when viewed from a direction perpendicular to both the extrusion shaft A and the direction in which the locking portion 282 faces. In other words, the open end surface 123 may be formed so as to face downward when viewed from the tip end direction of the extrusion shaft A. Assuming that the lower side (the side where the set member 146 is located in FIG. 1) is 0 degrees when viewed from the tip direction of the extrusion shaft A, it is inclined toward any direction in the range of −45 ° to + 45 ° including 0 °. It is preferable that the open end face 123 is formed. More preferably, it is formed toward 0 degrees.

The opening end surface 123 of the present embodiment is formed in a shape equivalent to a shape obtained by cutting a tubular tip portion 122 in a straight line from a direction intersecting the extrusion shaft A. The shape of cutting the tip portion 122 is not limited to traveling straight from the direction intersecting the extrusion shaft A. The open end face 123 may be formed in a shape equivalent to the shape in which the tip portion 122 is cut at an asymmetric angle with respect to the extrusion shaft A.

Since the opening end surface 123 is inclined, the discharge direction of the intraocular lens 1 discharged from the tip portion 122 is discharged while being bent in the direction in which the opening end surface 123 is inclined with respect to the direction of the extrusion shaft A. Further, since the notch 121 is formed, when the tip portion 122 is inserted into the incision wound of the patient's eye, the tubular tip portion 122 is deformed so that the outer diameter becomes smaller.

The insertion cylinder portion 124 is formed in a tapered shape in which the inner diameter of the cylinder gradually decreases toward the tip of the extrusion shaft A. The intraocular lens 1 passing through the insertion tube portion 124 is gradually bent slightly along the inner wall of the tubular inner diameter. The insertion portion 120 has a deformation mechanism 126 (see FIG. 9A) that deforms the front surface 2A of the intraocular lens 1 into a mountain-folded shape.

Specifically, the shape of the inner wall of the cross section of the tubular insertion cylinder portion 124 is formed to be asymmetrical between the upper side and the lower side. The shape of the inner wall in the direction facing the front surface 2A of the intraocular lens 1 is distorted outward, and the shape of the inner wall in the direction facing the rear surface 2B is formed by a flat surface (FIG. 9A). reference). A deformation mechanism 126 that combines a tapered inner wall and an inner wall whose cross section is asymmetrical in the vertical direction to deform the front surface 2A of the intraocular lens 1 into a mountain fold (that is, convex toward the front side). It is formed.

Further, the mounting portion 140 is connected to the base end side of the insertion cylinder portion 124. The mounting portion 140 has a mounting surface 142 on which the intraocular lens 1 is mounted, an opening 144, and a set member 146. The mounting portion 140 is a place where the intraocular lens 1 is placed immediately before being extruded, and the intraocular lens 1 is placed on the mounting surface 142 by an operator or an assistant (see FIG. 3).

As shown in FIG. 3, an opening 144 is provided below the mounting surface 142. The opening 144 is formed with an opening area through which the intraocular lens 1 can pass. A plate-shaped set member 146 that shields the opening of the opening 144 is connected to the opening 144 by a hinge mechanism. The hinge shaft of the hinge mechanism extends in the left-right direction perpendicular to the extrusion shaft A. The hinge mechanism allows the set member 146 to rotate toward the tip of the extrusion shaft A of the intraocular lens insertion device 10. The opening of the opening 144 is opened and closed by the rotation of the set member 146.

The set member 146 has an inner wall surface 147 that forms an inner wall of the mounting portion 140 that becomes tubular when closed. The inner wall surface 147 of the set member 146 is formed with a shaft protrusion groove 148 for reducing the axial deviation of the plunger 200 and a rough surface portion 149 having a rough surface for reducing the adhesion between the inner wall surface 147 and the intraocular lens 1. Has been done. The shaft protrusion groove 148 is a recessed groove extending in a direction parallel to the axis of the extrusion shaft A, and is formed by recessing the surface of the inner wall surface 147.

Further, as shown in FIG. 2, a plurality of locking holes 180 (first locking hole 180A and second locking hole 180B) are formed on the bottom surface of the main body 100 on the base end side of the mounting portion 140. There is. The first locking hole 180A and the second locking hole 180B are provided at different positions in the axial direction of the extrusion shaft A. The locking hole 180 is provided to suspend the plunger 200 at a predetermined position as the plunger 200 advances on the extrusion shaft A.

When the locking hole 180 of the main body 100 and the locking projection 262 (see FIG. 4) formed in the plunger 200 are engaged, the sliding resistance when advancing the plunger 200 changes, and the plunger 200 changes. Can be locked in place. At the moment when the plunger 200 is advanced and the locking hole 180 and the plunger 200 are engaged with each other, the sliding resistance generated between the main body 100 and the plunger 200 is reduced (reduced).

At the position where the second locking hole 180B is formed, the second locking hole 180B and the locking projection 262 engage with each other when the tip of the plunger 200 reaches a substantially intermediate point of the length of the insertion portion 120. It is formed like this. When the second locking hole 180B and the locking projection 262 are engaged, the intraocular lens 1 is positioned inside the tubular insertion portion 120 and is in a bent state.

The first locking hole 180A is provided to define the advance start position of the plunger 200. When the locking projection 262 and the first locking hole 180A are in the engaging positions, the extrusion portion 284 and the locking portion 282 (details will be described later) of the extrusion member 280 are located in the opening of the opening 144. (See FIGS. 3 and 7).

The intraocular lens insertion device 10 of the present embodiment is assembled in a state in which the first locking hole 180A and the locking projection 262 are engaged with each other. The completed intraocular lens insertion device 10 is housed in a case that accommodates the entire intraocular lens insertion device 10, and is transported to the site of use. The case maintains an engaged state between the first locking hole 180A and the locking projection 262. When the user opens the set member 146 with the intraocular lens insertion device 10 turned upside down, the extrusion portion 284 and the locking portion 282 are located below the opening of the opening 144.

Further, the main body 100 is formed with a grip portion 160 projecting vertically from the exterior surface of the tubular main body 100 on the base end side of the mounting portion 140. The grip portion 160 has an area that can be gripped by the fingers of the hand when the operator or the caregiver pushes out the plunger 200.

Further, the main body 100 includes an index 190 (see FIG. 1) for guiding the mounting direction of the intraocular lens 1 mounted on the mounting portion 140. The index 190 is located on the exterior surface (that is, the upper surface of the main body 100) which is the back side of the mounting surface 142, and is formed by making the exterior surface uneven in a predetermined shape. The main body 100 of the present embodiment has the contour shape of the intraocular lens 1 formed as an index 190. Since the main body 100 is colorless and transparent, the operator or an assistant can visually recognize the index 190 formed on the exterior surface from the side of the mounting surface 142 (that is, the bottom surface side).

The index 190 of the present embodiment is when the intraocular lens 1 is mounted so that the front surface 2A of the optical unit 2 faces the mounting surface 142 (that is, the front surface 2A and the mounting surface 142 face each other). The contour shape of the intraocular lens 1 viewed from above (that is, the bottom surface side) of the mounting surface 142 is formed on the main body 100 as an index 190.

The index 190 may be provided at a location other than the main body 100. For example, the index 190 may be provided in the case for accommodating the intraocular lens insertion device 10. Further, for example, the index 190 may be provided on a protective member or the like that is attached when the intraocular lens insertion device 10 is transported and is removed when the intraocular lens 1 is inserted.

Further, the index 190 is not limited to the contour shape of the intraocular lens 1, and may be described in other shapes or characters. The index 190 may guide the direction of the intraocular lens 1 mounted on the mounting portion 140. More preferably, the index 190 may guide the direction of the front surface 2A of the intraocular lens 1 mounted on the mounting portion 140 and the direction of the support portion 3.
<Plunger>

The plunger 200 will be described with reference to FIG. The plunger 200 includes an extrusion member 280 at its tip that comes into contact with the intraocular lens 1. Further, the plunger 200 has an extrusion rod 260, a shaft base portion 240, and a pressing portion 220.

A pressing portion 220 is formed at the base end of the plunger 200 to which the operator's finger comes into contact with the plunger 200 when the operator pushes it out. The pressing portion 220 is formed with a plate-shaped member orthogonal to the extrusion shaft A. A rod-shaped shaft base 240 extending in the direction of the extrusion shaft A is connected to the tip end side of the pressing portion 220.

The shaft base 240 is connected to a shaft plate extending in the direction of the tip of the extrusion shaft A, a top plate and a bottom plate connected to the upper and lower ends of the shaft plate and extending in the direction of the tip of the extrusion shaft A, and a shaft plate, a top plate, and a bottom plate. A vertical plate is formed which is connected to and orthogonal to the extrusion shaft A. Due to the shaft plate, top plate, bottom plate, and vertical plate, the shaft base portion 240 has rigidity that does not easily bend even when stress is applied from the vertical and horizontal directions toward the axial direction of the extrusion shaft A. Further, the shaft base 240 serves as a rotation prevention mechanism for preventing shaft rotation of the plunger 200 including the extrusion member 280 during extrusion of the plunger 200. Even if the plunger 200 is pushed out by the rotation prevention mechanism and the extruded member 280 protrudes from the tip portion 122, the direction in which the opening end surface 123 is inclined and the direction in which the locking portion 282 will be described later are maintained.

An extrusion rod 260 is connected to the tip end side of the shaft base portion 240. The extrusion rod 260 is formed with a shaft rod that extends in the direction of the tip of the extrusion shaft A and an overhang plate that projects from the left and right ends of the shaft rod in each of the left and right directions. Further, at the base end of the shaft base portion 240, a locking projection 262 that protrudes toward the bottom surface and engages with the locking hole 180 of the main body 100 is formed.

The overhang plate reduces the lateral deflection of the extrusion rod 260. The locking projection 262 is formed as a vane-shaped member extending from the lower end of the shaft rod (the upper end in the state of FIG. 4 inverted upside down) so as to be inclined toward the proximal end direction. Due to the shape of the blade, the locking projection 262 has elasticity in the vertical direction. When a stress is applied to the locking projection 262 in a direction intersecting the axial direction of the extrusion shaft A, the tip of the locking projection 262 bends. While the plunger 200 is in progress, the locking projection 262 advances through the main body 100 in a bent state.

A rod-shaped extrusion member 280 is connected to the tip of the extrusion rod 260. An extrusion portion 284 that extrudes the optical portion 2 of the intraocular lens 1 is formed on the tip end side of the extrusion member 280. A locking portion that locks the support portion 3 on the proximal end side of the extrusion portion 284, facing the front side of the support portion 3 of the intraocular lens 1 (that is, facing the front side of the support portion 3). 282 is formed (see FIG. 5).

Specifically, the extrusion member 280 has a rod-shaped shaft rod 281 formed at the base end. A base end surface 286, which is a slope whose left-right direction is inclined with respect to the extrusion shaft A, is formed on the tip end side of the shaft rod 281. The base end surface 286 serves as the base end of the locking portion 282. A plate-shaped flat plate portion 283 extending in the tip direction in parallel with the extrusion shaft A is connected to the upper end portion of the base end surface 286 (that is, the lower end portion in FIG. 5B).

In the intraocular lens insertion device 10 of the present embodiment, the end portion 292 of the base end surface 286 in the distal end direction of the extrusion shaft A is arranged at a position 3 to 4 mm from the extrusion portion 284. Further, the base end surface 286 may be inclined in the direction of the extrusion shaft A (in the lower left direction in FIG. 5B). By inclining in the direction of the extrusion shaft A, it is considered that the rear support portion 3B is more difficult to disengage from the locking portion 282 during the extrusion of the intraocular lens 1. Further, a protrusion or a protrusion plate that is horizontal to the extrusion shaft A and extends in the tip direction is provided at the end of the base end surface 286 in the direction away from the flat plate portion 283 (the end in the upward direction in FIG. 5B). You may.

A transition portion 287 whose cross-sectional area increases toward the tip is connected to the tip of the flat plate portion 283. A release slope 288 inclined in the proximal direction is formed in the transition portion 287. That is, the release slope 288 is inclined with respect to the plane orthogonal to the extrusion axis A so as to face the direction away from the extrusion axis A (upward in FIG. 5B).

A locking portion 282 for locking the support portion 3 of the intraocular lens 1 is formed by the base end surface 286, the flat plate portion 283, and the transition portion 287. The locking portion 282 may form a recessed portion 291 in which the rod-shaped extrusion member 280 is recessed toward the center of the extrusion shaft A. The depressed portion 291 is formed with an amount of depression in which the cross-sectional area of the depressed portion 291 in the axial direction is larger than the cross-sectional area of the cross section of the support portion 3.

By locking the support portion 3 with the locking portion 282 (in this embodiment, the base end surface 286 of the locking portion 282), the support portion 3 extends rearward to the extrusion member 280 when the intraocular lens 1 is pushed out. Entanglement is suppressed. Therefore, the phenomenon that the support portion 3 is damaged can be reduced. Further, when the intraocular lens 1 is ejected, the support portion 3 entwined with the extrusion member 280 eliminates the need to rotate the intraocular lens insertion device 10 while the intraocular lens 1 is ejected.

In the intraocular lens insertion device 10 of the present embodiment, when the set member 146 opened when the intraocular lens 1 is placed is closed, the recessed portion 291 is formed between the extrusion member 280 and the inner wall surface 147 of the set member 146. The gap is formed in the direction orthogonal to the extrusion axis A. The support portion 3 has a shape that crosses the formed gap. Further, the gap formed by the recessed portion 291 between the extruded member 280 and the inner wall of the main body 100 continues to the tip portion 122. Therefore, when the intraocular lens 1 is inserted, even if the set member 146 faces downward and the intraocular lens 1 is pushed out, the lock of the support portion 3 by the locking portion 282 is not released.
Since the locking portion 282 locks the support portion 3, it also has an action of pushing out the intraocular lens 1 together with the extrusion portion 284. The support portion 3 may be sandwiched between the depressed portion 291 and the tubular inner wall.

A rod-shaped extrusion portion 284 is connected to the tip of the transition portion 287. The extruded portion 284 includes a contact surface 289 at its tip that comes into contact with the optical portion 2 of the intraocular lens 1. Plate-shaped overhanging plates 290 overhanging toward the tip ends are formed at the upper and lower ends of the contact surface 289. The contact surface 289 is formed as a surface orthogonal to the extrusion shaft A. The contact surface 289 of the extruded portion 284 of the present embodiment is brought into contact with the edge 2C of the intraocular lens 1. Further, the overhang plate 290 is formed so that the edge 2C does not come off from the contact surface 289 during the extrusion of the intraocular lens 1.
<Intraocular lens>

An example of the intraocular lens 1 applicable to the intraocular lens insertion device 10 of the present embodiment will be described with reference to FIG. The intraocular lens insertion device 10 of the present embodiment has an optical portion 2 and a support portion 3 extending outward from a peripheral portion of the optical portion 2, and the front surface 2A can be deformed so as to be directed toward the cornea in the eye. It is preferable to use an intraocular lens 1.

Further, the support portion 3 formed in a loop shape is suitable. Further, a support portion 3 formed in an open loop type in which one end is connected to the optical portion 2 and the other end is in an open state is more preferable. Further, the support portion 3 formed of a thin filament type is more suitable. However, the present invention can be applied to intraocular lenses other than these preferred examples.

The intraocular lens 1 has an optical unit 2 that gives a predetermined refractive power to the patient's eye, and a support unit 3 for supporting the optical unit 2 in the eye. The optical unit 2 is formed with a circular front surface 2A and a rear surface 2B having different refractive powers.

Since the front surface 2A and the rear surface 2B have different optical characteristics, the optical unit 2 is installed in the eye of the patient in a predetermined direction. The optical portion 2 of the intraocular lens 1 of the present embodiment is designed so that the front surface 2A is installed toward the cornea of the patient's eye. The front surface 2A is placed toward the cornea of the patient's eye, so that the posterior surface 2B is directed toward the retina of the patient's eye.

An edge 2C having a side surface connecting the front surface 2A and the rear surface 2B is formed in the peripheral portion of the optical unit 2. The intraocular lens 1 of the present embodiment has two support portions 3 (front support portion 3A, rear support portion 3B). The support portion 3 is a thin filament type and has a circular cross section. The support portion 3 is distorted in the circumferential direction of the optical portion 2 toward the tip of the support portion 3. Further, the support portion 3 is formed as an open loop whose tip is an open end. The support portion 3 is connected to different positions on the peripheral portion of the optical portion 2. Further, the support portion 3 extends toward the outside of the optical portion 2.

As the material of the optical unit 2, a simple substance such as HEMA (hydroxyethyl methacrylate) or a material conventionally used for a bendable soft intraocular lens such as a composite material of an acrylic acid ester and a methacrylic acid ester is used. You may. As the material of the support portion 3, a material conventionally used as a support portion of the intraocular lens, such as PMMA (polymethylmethacrylate), may be used. Although the optical portion 2 and the support portion 3 have deformable elasticity, the support portion 3 does not hang down even when the front surface 2A of the optical portion 2 of the intraocular lens 1 is directed upward. ing.
<How to use>

The user (for example, an operator or a caregiver) takes out the intraocular lens insertion device 10 from the case in which the intraocular lens insertion device 10 is housed. Subsequently, the user holds the intraocular lens insertion device 10 by hand and opens the set member 146. The set member 146 may be housed in the case in an open state. By housing the set member 146 in the open state, the user does not need to open the set member 146 during use.

Subsequently, the user rotates the intraocular lens insertion device 10 so that the opening 144 that appears by opening the set member 146 faces upward (that is, the open set member 146 is located on the upper surface side). Manipulate.

Subsequently, the user injects a viscoelastic substance (not shown) into the mounting portion 140. By injecting the viscoelastic substance, the stickiness of the sticky and soft intraocular lens 1 is reduced. The viscoelastic material allows the intraocular lens 1 to be suitably advanced without being caught by the inner walls of the tubular insertion portion 120 and the mounting portion 140.

Subsequently, the user refers to the index 190 provided on the exterior side of the main body 100 from the inner surface side of the main body 100 through the mounting surface 142 coated with the viscoelastic substance, and holds the intraocular lens with tweezers or the like. The intraocular lens 1 is placed on the mounting portion 140 so that the front surface 2A of the optical portion 2 of 1 and the mounting surface 142 of the mounting portion 140 face each other (see FIG. 7).

At this time, the optical portion 2 abuts on the mounting surface 142 of the main body 100 from above (that is, from the bottom surface side of the intraocular lens insertion device 10), and the rear support portion 3B abuts on the locking portion 282 of the plunger 200 from above. Be abutted. The intraocular lens insertion device 10 of the present embodiment is manufactured in a state where the locking projection 262 of the plunger 200 is engaged with the first locking hole 180A of the main body 100. Further, the intraocular lens insertion device 10 is housed in a case with the first locking hole 180A and the locking projection 262 engaged with each other, and is transported to the site of use.

Since the first locking hole 180A and the locking projection 262 are transported in an engaged state, when the user takes out the intraocular lens insertion device 10 at the site of use and opens the set member 146, it is placed. The extrusion member 280 is positioned so that the extrusion portion 284 and the locking portion 282 overlap a part of the surface 142.

Subsequently, the user rotates the set member 146 in the proximal direction to close the set member 146. Subsequently, the user rotates the intraocular lens insertion device 10 by approximately 180 ° with respect to the extrusion shaft A, and holds the intraocular lens insertion device 10 so that the set member 146 faces downward (see FIG. 8).

Subsequently, the user pushes out the pressing portion 220 of the plunger 200 and advances the plunger 200 to a position where the locking projection 262 engages with the second locking hole 180B. While the locking projection 262 of the plunger 200 moves from the first locking hole 180A to the second locking hole 180B, the intraocular lens 1 forms an inner wall and deformation mechanism 126 that forms a tapered hollow shape of the insertion portion 120. Deformation begins to take place. When the locking projection 262 of the plunger 200 reaches the second locking hole 180B, the front surface 2A of the intraocular lens 1 is deformed into a mountain fold by the deformation mechanism 126 (see FIG. 9).

The surgeon then inserts the tip 122 into an incision formed in the cornea or sclera of the patient's eye lying upwards on the operating table. Subsequently, the operator inserts the tip 122 in the direction of the anterior capsule in which the anterior capsule is incised from the incision, and positions the distal end 122 so that the anterior capsule incision and the open end surface 123 of the distal end 122 face each other. Let me.

Subsequently, the operator pushes in the pressing portion 220 of the plunger 200. When the pressing portion 220 is pushed in and the engagement between the locking projection 262 of the plunger 200 and the second locking hole 180B is released, the intraocular lens 1 is bent even smaller as it moves to the tip of the insertion portion 120. , The intraocular lens 1 is ejected from the tip 122 toward the capsular bag. The optical portion 2 of the folded intraocular lens 1 slowly begins to restore when it passes through the opening of the tip portion 122. The operator pushes the pressing portion 220 of the plunger 200 until the extruded portion 284 and the locking portion 282 are exposed from the tip portion 122. When the base end of the main body 100 and the blade-shaped pressing portion 220 come into contact with each other, a large resistance force is generated, and the progress limit of the plunger 200 is reached.

Since the intraocular lens 1 is ejected so that the opening end surface 123 and the capsule of the lens face each other, the intraocular lens 1 is inserted into the intraocular lens insertion device 10 so that the front surface 2A of the folded optical portion 2 faces the corneal direction. Is discharged from. Further, since the front surface 2A of the optical unit 2 is mountain-folded by the intraocular lens insertion device 10, the peripheral portion of the optical unit 2 is restored from the retina side to the corneal side.

Further, since the intraocular lens 1 is ejected in a state where the support portion 3 is locked to the extrusion member 280, even if the intraocular lens 1 is ejected into the eye, the support portion 3 has the posterior capsule and the extrusion member 280. It is located between (see FIG. 10).

Subsequently, the operator pulls the insertion portion 120, in which the extrusion portion 284 and the locking portion 282 project from the tubular tip portion 122, in the direction of the incision. At this time, the surgeon may adjust the direction in which the tip portion 122 faces, slightly turn the tip of the tip portion 122 toward the cornea, and then pull back the insertion portion 120 in the direction of the incision.

In the intraocular lens insertion device 10 of the present embodiment, since the intraocular lens 1 is ejected so that the support portion 3 is located between the posterior capsule and the extrusion member 280, the support portion is provided on the locking portion 282. Even if 3 is locked and extruded, the extrusion member 280 and the intraocular lens 1 can be easily separated in the eye.

By pulling the insertion portion 120 back in the direction of the incision, the injection operation of the intraocular lens 1 by the intraocular lens insertion device 10 is completed.

Although the usage method of pulling back the insertion portion 120 in the direction of the incision after discharging the intraocular lens 1 is shown, a different usage method is also conceivable. For example, after ejecting the intraocular lens 1, the operator operates the plunger 200 and pulls back only the extruded member 280 protruding from the tip portion 122 toward the proximal end of the intraocular lens insertion device 10.
<Action and effect>

As described above, the intraocular lens insertion device 10 of the present embodiment is provided on the proximal end side of the extrusion portion 284, and is a locking portion 282 that faces the front surface side of the support portion 3 and locks the support portion 3. Is formed on the extrusion member 280. When the intraocular lens 1 is ejected into the eye, the intraocular lens 1 is ejected in a positional relationship in which the support portion 3 is on the capsular side and the extruded member 280 is on the corneal side.

Alternatively, an opening end surface 123 inclined in a predetermined direction is formed at the tip of the insertion portion 120, and a locking portion 282 is formed on the proximal end side of the extrusion portion 284 of the extrusion member 280. A locking portion 282 for locking the support portion 3 is formed on the surface side of the extruded member 280 in a predetermined direction facing the opening end surface 123. When the intraocular lens 1 is ejected into the eye with the opening end surface 123 directed toward the capsular bag, the intraocular lens 1 is ejected in a positional relationship in which the support portion 3 is on the capsular side and the extruded member 280 is on the corneal side. To.

The extruded member 280 does not get caught in the support portion 3, or the support portion 3 is less likely to get caught in the extruded member 280. The intraocular lens insertion device 10 can be easily pulled back from the inside of the eye, and the intraocular lens 1 can be easily ejected. Since the possibility that the intraocular lens 1 is inadvertently moved after the ejection of the intraocular lens 1 is reduced, the operator can quickly eject the intraocular lens 1.

If, unlike the present invention, the rear surface side of the support portion 3 is locked to extrude the intraocular lens 1, the eye is in a positional relationship in which the support portion 3 is on the corneal side and the extruded member 280 is on the capsular side. The inner lens 1 is ejected. In this case, when the operator pulls back the extruded member 280, the support portion 3 is easily caught by the friction with the surface of the extruded member 280 or the uneven shape such as the locking portion 282 formed on the extruded member 280. (For comparison, refer to FIG. 10 in which the present invention is described).

As the first method, if the extrusion member is pulled back while the support portion 3 and the extrusion member 280 are caught, the entire intraocular lens 1 moves in the direction away from the capsular bag. It takes time and effort to move the moved intraocular lens 1 toward the sac with tweezers or the like. As a second method, in order to pull back the support portion 3 and the extrusion member 280 so that they are not caught, the tip of the extrusion member 280 is once pushed toward the capsular bag and then extruded so as to draw a J shape from the opposite direction. An operation of pulling back the member 280 is required.

Both the first method and the second method require a delicate operation to eject the intraocular lens 1, and also require time to eject the intraocular lens. On the other hand, in the present invention, even if the support portion 3 is locked to the extrusion member 280 and discharged, the extrusion member 280 can be easily pulled back in the direction of the incision.

As the shape of the locking portion 282, for example, a locking portion 282 that is obliquely depressed with respect to the mounting surface 142 of the mounting portion 140 facing the front surface 2A of the optical portion 2 of the intraocular lens 1 is formed. You may. Further, a plurality of depressions forming the locking portion 282 may be provided (see FIG. 11). 11 and 12 are cross-sectional views corresponding to the axial positions of the flat plate portion 283 of the present embodiment.

Further, for example, the shape of the cross section of the shaft rod 281 forming the extrusion member 280 may be circular. Further, the direction of depression may be from the side toward the axial direction of the extrusion member 280 (see FIG. 12). The locking portion 282 formed on the extruded member 280 may not be formed at a position facing the rear surface side of the support portion 3. Further, the intraocular lens 1 may be locked to the locking portion 282 of the extrusion member 280 so that the locking portion 282 and the rear surface side of the support portion 3 do not face each other.

Further, in the present embodiment, the intraocular lens insertion device 10 in which the extrusion member 280 is advanced by pushing the plunger 200 by the operator's hand is used, but the extrusion member 280 may be advanced by another extrusion means. Good. For example, an actuator may be used to electrically advance the extrusion member 280. Further, for example, a method of applying pressure to the extrusion member 280 with a fluid or the like to advance the extrusion member 280 can be considered.

The present invention also applies to a cartridge consisting of an insertion portion 120, a mounting portion 140 and an extrusion member 280, or a preset type cartridge including an insertion portion 120, a mounting portion 140, an extrusion member 280 and an intraocular lens 1. The invention can be applied. It can be provided to users as a cartridge-type intraocular lens insertion device. Further, for example, the intraocular lens insertion device 10 may be a combination of a cartridge having the insertion portion 120 and the mounting portion 140 of the present invention and an extrusion means provided with the extrusion member 280 of the present invention.

Further, although the present embodiment uses a three-piece type intraocular lens 1 in which the optical portion 2 and the support portion 3 are separate members, the type of intraocular lens applicable to the present invention is not limited to the three-piece type. For example, it can be applied to a one-piece intraocular lens in which the optical portion 2 and the support portion 3 are integrally molded of the same material.

Further, in the present embodiment, the open-loop type intraocular lens 1 in which the tip of the support portion 3 is a free end is used, but the shape of the support portion 3 applicable to the present invention is not limited to the open-loop type. For example, it may be an intraocular lens in which both ends of the support portion 3 are connected to the optical portion 2. Further, in the present embodiment, the intraocular lens 1 having a pair of support portions 3 (3A, 3B) is used, but the intraocular lens 1 may have one support portion 3 or three or more support portions 3. Good.

Further, it is considered that the present invention can be applied to, for example, an intraocular lens in which the optical unit 2 is formed of a plurality of lenses, and an accommodative intraocular lens in which the refractive power of the optical unit 2 is deformed by the force of the patient moving the ciliary body. Be done. That is, any deformable intraocular lens whose support portion extends outward from the peripheral portion of the optical portion may be used.

Further, in the intraocular lens insertion device 10 of the present embodiment, the intraocular lens 1 can be easily mounted on the mounting portion 140 in a predetermined direction by the index 190. The phenomenon that the intraocular lens 1 is damaged or the intraocular lens 1 is ejected in an unintended form caused by a mistake in the mounting direction of the intraocular lens 1 is suppressed.

Further, in the intraocular lens insertion device 10 of the present embodiment, when the set member 146 is opened, a mounting surface 142 on which the intraocular lens 1 is placed appears, and the intraocular lens 1 can be easily filled in the intraocular lens insertion device 10. it can. The set member 146 is capable of opening and closing the inner wall corresponding portion of the intraocular lens insertion device 10 facing the locking portion 282 at the position where the intraocular lens 1 is placed inside the intraocular lens insertion device 10.

Since the set member 146 also serves as a part of the tubular inner wall of the main body 100, the total length of the intraocular lens insertion device 10 can be shortened. In addition, the cross-sectional area of the cross section of the intraocular lens insertion device 10 can be reduced. The volume of the intraocular lens insertion device 10 can be reduced, and the operator can easily handle the intraocular lens insertion device 10.

The intraocular lens insertion device 10 can easily bring the extrusion member 280 into contact with the front surface side of the support portion 3 only by combining the index 190 and the set member 146.

Further, in the intraocular lens insertion device 10 of the present embodiment, the front surface 2A of the optical unit 2 is folded in a mountain fold, so that when the bent intraocular lens 1 is discharged and restored, the peripheral portion of the optical unit 2 is formed. It is restored from the retinal side to the corneal side. By restoring the edge of the optical unit 2 from the retina side toward the cornea side, the possibility that the peripheral portion of the optical unit 2 comes into contact with the posterior surface of the cornea is reduced. Further, when the extrusion member 280 is extruded, the support portion 3 is less likely to come off from the locking portion 282.

Further, in the intraocular lens insertion device 10 of the present embodiment, the opening end surface 123 of the tip portion 122 is inclined, so that the insertion portion 120 can be easily inserted into the incision provided in the cornea. Further, since the aperture end surface 123 is inclined in the direction of the rear surface 2B of the optical portion 2, the intraocular lens 1 to be ejected is bent in the direction of the capsular bag and ejected. The intraocular lens 1 can be quickly placed in the capsular bag.

Further, since the inclination direction of the opening end surface 123 and the direction in which the locking portion 282 is formed on the extrusion member 280 are substantially the same direction, when the intraocular lens 1 is ejected toward the capsular bag, the support portion 3 Is on the capsular side and the extruded member 280 is on the corneal side. The extruded member 280 does not get caught in the support portion 3, or the support portion 3 is less likely to get caught in the extruded member 280. Therefore, the intraocular lens insertion device 10 can be easily pulled back from the inside of the eye, and the intraocular lens 1 can be easily ejected.

It should be noted that the intraocular lens 1 can be quickly installed only by the deformation mechanism 126 that deforms the front surface 2A of the optical unit 2 into a mountain fold and the opening end surface 123 that is inclined in the direction of the rear surface 2B, and the intraocular lens 1 and the posterior surface of the cornea Becomes difficult to contact. There is an effect that the intraocular lens 1 can be easily inserted into the eye.

Further, in the intraocular lens insertion device 10 of the present embodiment, of the surfaces of the locking portion 282, the proximal end surface 286 facing the tip end direction of the extrusion shaft A is the anteroposterior direction of the intraocular lens 1 and the axial direction of the extrusion shaft A. It is tilted in either the left or right direction, which intersects both of the above. Therefore, the bending load on the support portion 3 can be preferably released, and the bending load on the support portion 3 can be reduced. It is possible to reduce the possibility that the support portion 3 is broken when the intraocular lens 1 is pushed out and the intraocular lens 1 is damaged.

Further, in the intraocular lens insertion device 10 of the present embodiment, the end portion 292 of the base end surface 286 in the distal end direction of the extrusion shaft A is arranged at a position 3 to 4 mm from the extrusion portion 284. When pushing out the intraocular lens 1, the support portion 3 can be suitably locked by the locking portion 282. As a result, the possibility that the support portion 3 is damaged or the support portion 3 is bent in an unintended direction is reduced. Therefore, the operator can quickly insert the intraocular lens 1.

Even if the formed position of the inclined base end surface 286 or the end portion 292 is combined with the three-piece type intraocular lens, the effect of stably ejecting the three-piece type intraocular lens in which the support portion 3 is easily damaged when bent greatly is obtained. is there.

The present invention can also be applied to an intraocular lens insertion system in which an intraocular lens 1 is pre-filled in an intraocular lens insertion device 10 and manufactured, and is transported to a site of use. It is not necessary to fill the intraocular lens 1 at the site of use, and it can be used immediately. The intraocular lens 1 can be easily inserted into the eye.

Further, when applied as an intraocular lens insertion system, the optical portion 2 and the support portion 3 may be formed of different materials, and the support portion 3 may be filled with a filament type three-piece intraocular lens. In this case, even if the support portion 3 is a three-piece type intraocular lens that is difficult to bend and tack, the intraocular lens 1 can be suitably ejected into the eye without the support portion 3 being entangled.

Further, the intraocular lens insertion device 10 of the present embodiment includes notch means (locking hole 180, locking projection 262) for temporarily stopping the advancing extrusion member 280 at a predetermined position. The sliding resistance is changed at a predetermined position by the notch means. In this embodiment, the sliding resistance increases. The notch means facilitates the operation of the intraocular lens insertion device 10.

The support portion 3 of the intraocular lens 1 can be easily brought into contact with the extrusion member 280 by the set member 146 that opens above the mounting surface 142 and the notch means that increases the sliding resistance. The intraocular lens 1 can be stably inserted without making the intraocular lens insertion device 10 a complicated structure.

Further, in the intraocular lens insertion device 10 of the present embodiment, the support portion 3 can be locked to the locking portion 282 only by mounting the intraocular lens 1 on the mounting surface 142. A mechanism for locking the support portion 3 to the locking portion 282 of the extrusion member 280 during extrusion becomes unnecessary, and the intraocular lens insertion device 10 can be manufactured at low cost.

Further, the intraocular lens 1 is pushed out with the support portion 3 locked by the locking portion 282. Therefore, the support portion 3 is less likely to get entangled with the plunger 200 while the intraocular lens 1 is in progress, and the operation of adjusting the direction of the intraocular lens 1 when the intraocular lens 1 is ejected tends to be unnecessary.

Further, in the intraocular lens insertion device 10 of the present embodiment, the inner wall surface 147 forming the tubular inner wall of the set member 146 that can be opened and closed has a rough surface portion 149 on which a rough surface is formed. Since the rough surface portion 149 is formed on the set member 146, it is possible to reduce the adhesion between the intraocular lens 1 and the set member 146 without performing a lubrication coating treatment on the set member 146. An inexpensive intraocular lens insertion device 10 can be provided.

Further, in the intraocular lens insertion device 10 of the present embodiment, the set member 146 is provided with a rotating means that rotates in the direction of the tip of the extrusion shaft A by a hinge mechanism. Even if the set member 146 is closed after the viscoelastic substance is injected, the phenomenon that the viscoelastic substance is biased to one side in the left-right direction does not occur by closing the set member 146. Even with a simple structure, the viscoelastic substance can be suitably applied to the mounting portion 140.

Further, in the intraocular lens insertion device 10 of the present embodiment, a notch 121 cut in a V shape toward the proximal end is formed at the proximal end of the inclined aperture end surface 123. When inserting the insertion portion 120 into the incision, the outer diameter of the tip portion 122 can be reduced. The insertion portion 120 can be easily inserted into the incision.

Further, in the intraocular lens insertion device 10 of the present embodiment, a release slope 288 whose surface faces the proximal end side is formed on the distal end side of the locking portion 282. Since the locking portion 282 faces the bag when the intraocular lens 1 is ejected, even if the release slope 288 and the support portion 3 come into contact with each other when the extrusion member 280 is pulled back, the release slope 288 points the support portion 3 toward the bag. It works as an action to move to. The support portion 3 locked to the locking portion 282 can be easily separated from the extrusion member 280.

2 Optical part 2B Rear surface 3A Front support part 3B Rear support part 120 Insertion part 140 Mounting part 280 Extruding member 282 Locking part 284 Extruding part

Claims (4)

A deformable intraocular lens having an optical portion and a support portion extending outward from the peripheral portion of the optical portion and having the front surface directed toward the cornea in the eye, and a rod-shaped insertion portion having an opening at the tip. An intraocular lens insertion device that is inserted into the eye by advancing the extrusion member toward the tip of the extrusion shaft.
The insertion part is
A tubular tip that extends in the direction of the tip,
An insertion tube portion that is connected to the base end of the tip portion and whose inner wall is formed in a tapered shape for slightly deforming the intraocular lens.
An opening provided at the tip of the tip for discharging the intraocular lens, which is formed in a shape cut diagonally when viewed from a direction orthogonal to the extrusion axis.
With
The extruded member
An extrusion unit provided on the tip side of the extrusion shaft and extruding the optical unit,
A locking portion provided on the base end side of the extruded portion and facing the front surface side of the support portion to lock the support portion.
With
An opening end surface formed so as to be inclined in a direction in which the rear surface side of the support portion, which is opposite to the front surface side, faces, and the opening portion is a direction in which the rear surface side of the support portion locked by the locking portion faces. Has an open end face formed at an angle to
A V-shaped notch is formed at the base end of the opening toward the base end direction of the extrusion shaft, and the entire cut portion is formed on the tip side of the insertion cylinder portion. and,
The locking portion makes it difficult for the extrusion member to get caught in the support portion when the intraocular lens insertion device is pulled back out of the eye after the intraocular lens is inserted into the eye.
An intraocular lens insertion device characterized by this. The intraocular lens insertion device according to claim 1.
A mounting portion that is connected to the proximal end side of the insertion portion and on which the intraocular lens before the advance is mounted in a state where the support portion is locked by the locking portion.
An index for guiding the mounting direction of the intraocular lens, which is an index for mounting the intraocular lens on the previously described mounting portion so that the front side of the supporting portion and the locking portion face each other. ,
An intraocular lens insertion device characterized by being equipped with . The intraocular lens insertion device according to claim 1 or 2.
The locking portion is formed in a recessed shape that is recessed toward the center of the extrusion shaft, and the proximal end surface of the locking portion facing the tip end direction of the extrusion shaft is left and right with respect to the axial direction of the extrusion shaft. An intraocular lens insertion device characterized by being tilted in one direction. A deformable intraocular lens having an optical portion and a support portion extending outward from the peripheral portion of the optical portion and having the front surface directed toward the cornea in the eye is pre-filled, and the intraocular lens has an opening at the tip. An intraocular lens insertion system that inserts a rod-shaped extrusion member into the eye by advancing it toward the tip of the extrusion shaft into the tubular insertion portion.
The insertion part is
A tubular tip that extends in the direction of the tip,
An insertion tube portion that is connected to the base end of the tip portion and whose inner wall is formed in a tapered shape for slightly deforming the intraocular lens.
An opening provided at the tip of the tip for discharging the intraocular lens, which is formed in a shape cut diagonally when viewed from a direction orthogonal to the extrusion axis.
With
The extruded member
An extrusion unit provided on the tip side of the extrusion shaft and extruding the optical unit,
A locking portion provided on the base end side of the extruded portion and facing the front surface side of the support portion to lock the support portion.
With
An opening end surface formed so as to be inclined in a direction in which the rear surface side of the support portion, which is opposite to the front surface side, faces, and the opening portion is a direction in which the rear surface side of the support portion locked by the locking portion faces. Has an open end face formed at an angle to
A V-shaped notch is formed at the base end of the opening toward the base end direction of the extrusion shaft, and the entire cut portion is formed on the tip side of the insertion cylinder portion. and,
The locking portion prevents the extruded member from being caught in the support portion when the intraocular lens insertion system is pulled back out of the eye after the intraocular lens is inserted into the eye.
An intraocular lens insertion system characterized by this.

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