JP2011139863A - Intraocular lens injection instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intraocular lens injection instrument capable of stably and quickly injecting and opening an entire IOL including support parts in an eye. <P>SOLUTION: The intraocular lens injection instrument comprises: an injection part configured to internally hold the IOL and inject the IOL into the eye through an incision formed in the eye; a cylinder body part provided, at its front end, with the injection part ; a plunger for pushing the IOL out of the injection part, the plunger being placed in the cylinder body part to be movable in an axial direction of the cylinder body part; and a contact surface arranged in a position on axis and apart from the tip end by a predetermined distance toward the base end of the plunger, the plane being to contact with the support parts of the IOL. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Conventionally, it is composed of a soft optical part that can be bent as a substitute for the lens and a support part called a loop for fixing and holding the optical part in the eye after extracting the lens as one of the surgical methods for cataract A method of inserting an intraocular lens is generally used.

  An intraocular lens insertion device called an injector is used to insert a foldable intraocular lens. The tip of the injector is tapered, and when the intraocular lens installed inside is pushed toward the tip of the injector with an extrusion rod called a plunger, the intraocular lens is bent slightly according to the shape of the inner wall. . And since the intraocular lens is folded and injected into the eye with a reduced diameter, the incision provided in the patient can be made as small as possible, reducing the burden on the patient and reducing postoperative astigmatism, etc. Occurrence of sequelae is suppressed (for example, see Patent Document 1). When an intraocular lens is delivered into the eye using such an intraocular lens insertion device, the folded intraocular lens needs to be completely delivered into the eye from the distal end of the insertion device together with the optical part and the support part. .

JP-A-8-24282

However, when the optical part is folded in the insertion instrument, the rear support part may be twisted and placed in the insertion instrument. If the rear support part is left in the insertion device in such a twisted state, the optical part will show unintended behavior due to the twist of the support part while the optical part is sent into the eye and gradually opens. There is. In order to avoid such unintended behavior of the optical unit, it is necessary to quickly feed the twisted rear support portion from the distal end of the insertion instrument after the delivery of the optical section. When pushing the optical part that has been delivered and released into the eye with a plunger, you must push it out with care so that the tip of the plunger does not come off the optical part. Difficult to push out quickly.

  In view of the above-described problems of the conventional technology, the present invention provides a device for inserting an intraocular lens that can quickly and stably perform injection and release of the entire intraocular lens including the support portion into the eye. Let it be an issue.

In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) In an intraocular lens insertion device for folding an intraocular lens having an optical part and a support part for supporting the optical part in the eye, and sending the intraocular lens into the eye, the intraocular lens is mounted inside. An insertion part for inserting an intraocular lens from an incision provided on the placed eyeball, a cylindrical insertion device body provided with the insertion part at the tip, and for pushing out the intraocular lens from the insertion part A plunger provided in the cylinder of the insertion portion main body so as to be movable back and forth in the axial direction, and the plunger is positioned on the axis separated from the distal end by a predetermined distance from the distal end toward the proximal end side. A contact surface for contacting the support portion of the inner lens is formed.
(2) In the intraocular lens insertion device according to (1), the abutment surface of the support portion on the rear side of the intraocular lens with the distal end of the plunger abutting on the optical portion in the insertion portion. It is formed in the position which one part contact | abuts.
(3) In the intraocular lens insertion device according to (2), the contact surface is formed in a plane substantially perpendicular to the pushing shaft of the plunger.
(4) In the intraocular lens insertion device according to (3), the predetermined distance causes invariant deformation of the rear support portion in a state where the tip of the plunger is in contact with the optical portion. Positioned at the tip of the rear support portion when the rear support portion is extended by an extruding operation from an axis located at the maximum diameter including the support portion when no stress is applied. It is a range up to the axis to perform.

  According to the present invention, injection and release of the entire intraocular lens including the support portion into the eye can be performed quickly and stably.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic external view showing the external appearance of an intraocular lens insertion device 1 used in the present embodiment. FIG. 1A shows the intraocular lens insertion device 1 as viewed from above, and FIG. 1B shows the state as viewed from the side.

  The intraocular lens insertion device 1 includes an insertion unit for inserting an intraocular lens from an incision formed in the eyeball in order from the side to be inserted into the eyeball, and a mounting for installing the intraocular lens 40 (see FIG. 2). A lens holding portion 10 (hereinafter referred to as a cartridge) that holds an intraocular lens provided with a placement portion, and a cylindrical portion (insertion device main body, Handpiece) 20 and an extrusion means (plunger) 30 for inserting the inside of the cartridge 10 and the cylindrical portion 20 and for extruding the intraocular lens 40 from the tip of the cartridge 10 mounted on the cylindrical portion 20. .

  FIG. 2 is a diagram showing the configuration of the intraocular lens 40. Here, the support part 42 (the front support part 42a and the rear support part 42b with respect to the pushing direction) is formed with a thin loop shape (C-shaped, J-shaped) with the optical part 41 and the distal end being a free end. ) Are prepared separately, and thereafter, a three-piece intraocular lens obtained by integrating them will be described as an example.

  The optical unit 41 is formed of a material conventionally used for a flexible intraocular lens that can be bent, such as a simple substance such as HEMA (hydroxyethyl methacrylate) or a composite material of acrylic ester and methacrylic ester. Moreover, the support part 42 should just be formed from the material conventionally used as a support part of an intraocular lens, for example, is PMMA (polymethylmethacrylate) etc.

  3 and 4 are diagrams showing the configuration of the cartridge 10. The cartridge 10 is integrally formed with an insertion portion (insertion tube) 11 having a tapered shape whose diameter gradually decreases (thinner) toward the tip, and a placement portion 12 on which the intraocular lens 40 is installed. Yes. The cartridge 10 is entirely made of synthetic resin and is a disposable type that is discarded after one use. The insertion portion 11 has a hollow cylindrical shape, and the folded intraocular lens 40 is sent out from the insertion portion distal end 11a formed in a substantially elliptical opening through the hollow portion.

  The mounting portion 12 is formed of two halved members 12a and 12b, and the lower edges of the halved members 12a and 12b are connected by a hinge portion 13 as shown in FIG. It has become. The mounting tables 14a and 14b on which the intraocular lens 40 is placed are provided on the half members 12a and 12b, respectively. The shape (wall surface shape) of the mounting surface on which the intraocular lens 40 is placed has a curved surface along the direction in which the intraocular lens 40 is bent.

  When the half members 12a and 12b are closed, the wall surface shape (mounting surface shape) of the mounting bases 14a and 14b is deformed and substantially coincides with the opening shape (semicircular shape) on the proximal end side of the insertion portion 11 ( (See FIG. 4). Further, the outer shape of the mounting portion 12 when the half members 12a and 12b are closed is substantially matched with the inner wall shape of the cylindrical portion 20 described later. Further, as shown in FIG. 3B, when the mounting table 14a (14b) mounts the optical unit 41 (indicated by a dotted line) of the intraocular lens 40, the rear support unit 42b (on the insertion unit 11 side). Is formed in such a size that it slightly protrudes backward from the mounting table 14a (14b).

  The covers 15a and 15b are provided on the upper part of each of the half members 12a and 12b, and cover the top of the mounting table 14a and the mounting table 14b when the half member 12a and the half member 12b are closed. Is formed. A flat plate-shaped gripping portion 18 that is gripped when the user holds the cartridge 10 is provided on the side surface of the half member 12a.

  Further, the end of the cover 15b is formed to extend from the upper side of the mounting tables 14a and 14b toward the mounting tables 14a and 14b, and is a convex member that is a convex member extending a predetermined length along the axial direction. A portion 16 is provided. When the intraocular lens 40 set in the cartridge 10 is bent, the convex portion 16 serves to guide the folding (folding) direction so as to always follow the inner wall surfaces (mounting surfaces) of the mounting tables 14a and 14b. . The inclined portions 17a and 17b are provided to facilitate insertion of the intraocular lens 40 onto the mounting table 14a and the mounting table 14b from the proximal end side of the cartridge 10.

  In the cartridge 10 having such a configuration, the intraocular lens 40 is set on the mounting table 14a and the mounting table 14b in a state where the mounting unit 12 is opened (a state where the two halved members are separated), and thereafter By mounting the cartridge 10 on the cylindrical portion 20, the half member 12a and the half member 12b are closed and the intraocular lens 40 can be folded.

  FIG. 5 is a perspective view schematically showing the external configuration of the cylindrical portion 20, and FIG. 6 is an explanatory diagram of the internal configuration of the cylindrical portion 20. Here, FIG. 6A shows a state in which the internal configuration of the intraocular lens insertion device 1 configured by combining the cartridge 10 and the cylindrical portion 20 is viewed from the side. Is attached to the intraocular lens 40. FIG. 6B shows an explanatory diagram regarding the relationship with the distal end portion 34 when the insertion portion 11 is viewed from the insertion portion distal end 11a side.

  A mounting portion 21 for attaching and detaching the cartridge 10 is provided at the tip of the cylindrical portion 20. The mounting portion 21 has a shape in which the distal end of the cylindrical portion 20 is substantially halved. A convex portion 22 is provided at the distal end, and a concave portion 23 is provided at the proximal end, and is symmetrical with respect to the pushing means 30 that passes through the center of the cylindrical portion 20 Each is formed. Further, the convex portion 22 is located slightly above the central axis of the cylindrical portion 20, and the distance between the convex portions 22 provided on the left and right is slightly narrower (shorter) than the inner diameter of the cylindrical portion 20. . Such a shape of the convex portion 22 serves as a guide that restricts the halved members 12a and 12b that are opened when the cartridge 10 is mounted to the mounting portion 21 in a closing direction and limits the width thereof. The snap-in structure that locks the mounted cartridge 10 and prevents it from being easily detached from the cylindrical portion 20 is provided. Note that the left and right edges of the mounting portion 21 also serve as guides for restricting the halving member in the closing direction, like the convex portion 22.

  Inside the hollow cylindrical portion 20, an extruding means 30 is inserted so as to be able to advance and retreat in the axial direction through a passage connecting from the cylindrical portion 20 to the tip of the cartridge 10 (insertion portion 11). When the intraocular lens 40 is pushed out, the push-out means 30 includes a tip 34 that comes into contact with the optical unit 41, a push 33 that is pushed by the operator user, and a shaft to which the push 33 is connected. The base 32 and the extrusion rod 31 that connects the tip 34 and the shaft base 32 are configured. Note that the tip of the push rod 31 is formed with an abutting surface 35 that can abut the vicinity of the tip of the support portion 42b on the rear side in a state where the tip 34 abuts on the optical part 41.

  Since the distal end portion 34 serves to send the intraocular lens 40 from the insertion portion 11 to the outside, the distal end portion 34 has a size (diameter) that can be inserted through the insertion portion 11 and the internal passage of the cartridge 10. A cross section perpendicular to the extrusion direction is formed in a substantially semicircular shape so that both the support portion 42b can be inserted through the insertion portion 11 (see FIG. 6B). Note that the shape of the distal end portion 34 is not limited to a substantially semicircular shape, as long as the support portion is not sandwiched between the distal end portion 34 and the inner wall of the insertion portion 11 during the pushing operation of the intraocular lens. Good. For example, the distal end portion 34 has a rectangular shape in cross section, and has a shape and size in which a space s as a refuge is formed so that the support portion 42 b is not sandwiched between the distal end portion 34 and the inner wall w of the insertion portion 11. I need it.

  Here, the abutting surface 35 is on an axis separated by a predetermined distance from the distal end to the proximal end so that the distal end of the support portion 42b is in contact with the optical portion 41 in a state where the distal end portion 34 is in contact with the optical portion 41 ( Around the axis). More specifically, the abutment surface 35 is formed in a plane substantially perpendicular to the extrusion shaft so that the rear support portion 42b can be pushed simultaneously while pushing out the intraocular lens 40. In addition, the position where the contact surface 35 is formed on the axis of the push-out means 30 is subjected to a stress that causes indefinite deformation of the rear support portion 42b in a state where the distal end portion 34 is in contact with the optical portion 41. When the support portion 42b is extended from the axis positioned at the maximum diameter including the support portion 42 of the intraocular lens 40 when the support portion 42b is extended by the push-out operation. It suffices if it is formed between. Here, invariant deformation refers to a state in which the intraocular lens 40 cannot return to its original shape, such as a part of the support portion 42b bent in the opposite direction and broken.

  In the present embodiment, the shaft connecting the distal end portion 34 and the extrusion rod 31 is made thinner than the diameter (lateral width) of the distal end portion 34 and the diameter of the extrusion rod 31 is substantially equal to the opening of the insertion portion distal end 11a. By doing so, the front end surface of the push rod 31 is made to be the contact surface 35 on which the support portion 42b can contact.

  Here, as shown in FIG. 6B, the diameter d of the contact surface 35 is formed to have a size substantially equal to the opening of the insertion portion distal end 11a. It is sufficient that the hollow portion can be inserted and has a size including a position where the tip of the support portion 42b abuts. In the present embodiment, the contact surface 35 is formed on the entire circumference (360 degrees) with respect to the extrusion shaft. In addition to this, the contact surface 35 is a support portion when the intraocular lens 40 is pushed out. What is necessary is just to form in the position which the front-end | tip part of 42b can contact.

  Next, the injection | pouring operation | movement of the intraocular lens 40 using the intraocular lens insertion instrument 1 provided with the above structures is demonstrated. The operator (user) holds the cartridge 10 by holding the grip portion 18 of the cartridge 10 with one hand, and picks up the intraocular lens 40 with the other hand using a lever. The picked up intraocular lens 40 is inserted into the cartridge 10 from the proximal end side and placed on the mounting tables 14a and 14b. When no stress is applied to the cartridge 10, the half members 12a and 12b are opened as shown in FIG. 4A, and the intraocular lens placed on the mounting tables 14a and 14b. No. 40 is in an unfolded state (a state in which no stress is applied).

  Next, in order to attach the cartridge 10 to the cylindrical portion 20, the push rod 31 is pulled out to the proximal end side of the cylindrical portion 20, and the grip portion 18 (proximal end side) of the cartridge 10 is inserted into the recess 23 provided in the mounting portion 21. ) Is pressed against the convex portion 22 (or the left and right edges of the mounting portion 21). The bottom surface (lower part) of the mounting portion 12 is pressed against the convex portion 22 (or the left and right edge portions of the mounting portion 21), so that the convex portion 22 closes the half member 12a and the half member 12b. Is done. Further, when the mounting portion 12 is pushed into the mounting portion 21, as shown in FIG. 4B, the half member 12a and the half member 12b are mounted on the mounting portion 21 in a closed state.

  In a state where the half member 12a and the half member 12b are closed, the width (interval) between the mounting table 14a and the mounting table 14b is narrow, and the intraocular lens 40 is formed on the wall surfaces of the mounting tables 14a and 14b. It is pushed from the left / right direction. When the stress is applied to the intraocular lens 40, the intraocular lens 40 is bent along the wall surfaces (mounting surfaces) of the mounting tables 14a and 14b. At this time, the front end of the support portion 42a positioned in front is brought into contact with the inner wall surface when the mounting bases 14a and 14b are closed, and stress is applied, so that the front end faces forward. When the cartridge 10 is attached to the attachment portion 21, the distal end of the insertion portion 11 is inserted into the patient's eye from which the crystalline lens has been removed. In this state, the pressing portion 33 is pressed to move the entire pushing means 30 (the tip 34, the contact surface 35, etc.) forward.

  Here, the extrusion operation of the intraocular lens 40 will be described. FIG. 7 is an explanatory diagram of the pushing operation of the intraocular lens 40. 7 shows a schematic diagram of a cross section when the inside of the cartridge 10 is viewed from above. When the pressing part 33 is pushed in from the state where the intraocular lens 40 is mounted on the mounting part 12, the tip part 34 comes into contact with the optical part 41 as shown in FIG. At this time, the rear support portion 42b is placed on the axis of the push rod. When the pressing portion 33 is further pushed, the intraocular lens 40 is pushed out of the mounting table 12 and enters the insertion portion 11 as shown in FIG. At this time, since the opening diameter of the insertion portion 11 is narrowed, the optical portion 41 is bent (rounded) along the inner wall surface w of the insertion portion 11.

  The tip of the rear support part 42 b comes into contact with the inner wall surface w as the optical part 41 is bent. When the pressing portion 33 is further pushed from this state, the support portion 42b is gradually extended with the contact point with the inner wall surface w as a base point, and twisted with the contact point with the inner wall surface w as a base point by the operation of folding the optical portion 41. It becomes like this. In this way, the rear support portion 42b is extended by the pushing operation, so that the tip of the support portion comes into contact with the contact surface 35. In addition, since the hollow part of the insertion part 11 is thin, the support part 42b once extended in the insertion part 11 does not return to the original state, but moves to the insertion part distal end 11a side with a twist. Will come to be.

  In this manner, the optical portion 41 is further pressed by the pressing portion 33 in a state where the distal end portion 34 is in contact with the optical portion 41 and the distal end of the support portion 42b is in contact with the contact surface 35, and the optical portion 41 is inserted from the insertion portion distal end 11a. Is sent out, the optical part 41 begins to open gradually (see FIG. 7C). Even after the optical part 41 is sent out from the insertion part tip 11 a and released from the insertion part 11, the tip of the support part 42 b is in contact with the contact surface 35 of the push rod 31. For this reason, after the optical part 41 is released, the tip part 34 (extrusion rod 31) is further pushed forward so that the support part 42b is quickly sent out regardless of whether the tip part 34 is in contact with the optical part 41 or not. (See FIG. 7D). As a result, before the stress due to the twist of the support part 42b is applied to the optical part 41, the support part 42b can be quickly pushed out from the inside of the cartridge 10, and the unintended behavior of the optical part 41 previously positioned in the eye. Can be prevented.

  Further, when the contact surface 35 is pushed out from the insertion portion distal end 11 a, the support portion 42 b is separated from the contact surface 35 by the restoring force. And it comes to be arrange | positioned along the sac by the stress applied from within the eye. Thereby, the optical part 41 is suitably held in the eye by the support part 42 (42a, 42b).

  As described above, by providing the push-out means 30 with the abutment surface 35 that abuts and pushes out the support portion located at the rear, before the stress due to the twist of the support portion 42 is applied to the optical portion 41, the eye The entire inner lens 40 is positioned in the sac, and the optical unit 41 is appropriately arranged in the sac. In addition, since the intraocular lens 40 can be pushed out by both the distal end portion 34 and the contact surface 35 disposed on the rear side, the operator can easily push the intraocular lens 40. The intraocular lens 40 can be positioned in the eye quickly (at a time).

  In the above description, the case where a three-piece intraocular lens is injected into the eye using the intraocular lens insertion instrument 1 has been described. However, the intraocular lens insertion instrument 1 having the above-described configuration includes an optical unit, a support unit, and an optical unit. Can be used for a one-piece type intraocular lens in which is integrally molded (for a one-piece type intraocular lens (see FIG. 8). In this case, the formation position of the contact surface 35 in the axial direction is in the optical part. At least the rear support portion is in contact with the tip portion 34 being in contact, and the base portion of the support portion is in a position that is unlikely to be bent (hard). Since 120 is formed of a flexible material, the contact surface 135 can be formed at a position closer to the distal end portion 131 than in the case of the three-piece type. To be able to put out It made.

  In addition, when injecting a 1-piece type intraocular lens, the intraocular lens insertion device of the structure shown in the following modifications other than said intraocular lens insertion device 1 can be used. FIG. 8 shows a schematic external view of a one-piece type intraocular lens. The intraocular lens 100 includes an optical unit 110 having a predetermined refractive power and a pair of support units 120 for supporting the optical unit 110 in the eye (a front support unit 120a and a rear support unit with respect to the pushing direction). Part 120b). The support portion 120 has a loop shape with one end being a free end.

  In addition, the optical unit 110 and the support unit 120 of the present embodiment can be bent such as a simple substance such as HEMA (hydroxyethyl methacrylate), a composite material of acrylic acid ester and methacrylic acid ester, and the intraocular lens 100 can be folded in the sac. It is made of a material for a soft intraocular lens having a repulsive force necessary to be fixed. The intraocular lens 100 uses the intraocular lens material described above, and the optical unit 110 and the support unit 120 are integrally formed by cutting, molding, or the like. One end of the support unit 120 is a free end, and the other end (base end) is connected to the optical unit 110. Further, the support part 120 is placed so as to face each other via the center (optical axis L) of the optical part 110, and is formed to extend radially by a predetermined length.

  Here, a modified example 1 of the intraocular lens insertion device for pushing out the one-piece type intraocular lens 100 will be described. In the intraocular lens insertion device of the present embodiment, the lens holding unit 10 and the tube unit 20 have the same configuration as the above-described intraocular lens insertion device 1, and detailed description thereof is omitted. FIG. 9 is an explanatory diagram of an extrusion operation using the extrusion means 130 of the intraocular lens insertion device of the first modification. FIG. 9A shows a state in which the intraocular lens 100 is positioned inside the insertion portion 11, and FIG. 9B shows a state in which the entire intraocular lens 100 is pushed out from the insertion portion 11. In addition, in description of FIG. 9, the structure same as the intraocular lens insertion instrument 1 is demonstrated using the same figure number.

  In FIG. 9, the push-out means 130 includes a distal end portion 131 that is in contact with the optical portion 110, a holding portion 132 that is a groove into which the rear support portion 120 b is fitted when the intraocular lens 100 is pushed out, A contact surface 135 for pushing out the support portion 120b from the cartridge 10 is formed. In this case, the contact surface 135 is formed at a position where the support portion 120b bent in the insertion portion 11 can be in contact with the distal end portion 131 in contact with the optical unit 110. It only has to be done. As shown in FIG. 9A, when such a one-piece type intraocular lens is used, it is formed between the inner wall w of the cartridge 10 and the wall surface connected to the contact surface 135 from the distal end portion 131. It is more preferable to form the contact surface 135 so that the vicinity of the base of the rear support portion 120b can be held in the predetermined space. In this manner, the optical unit 110 is extruded by pushing the support unit 120b in a predetermined space formed between the inner wall w of the cartridge 10 and the wall surface connected to the contact surface 135 from the front end portion 131. Since the opening of the optical unit 110 is performed with the supported support 120b as an axis after the optical fiber 110 is delivered from the tip, the opening behavior is stabilized. In addition, the size of the contact surface 135 in the radial direction may be a size inserted through the insertion portion distal end 11a and may be formed at a position corresponding to the space formed by the pushing means 130 and the inner wall surface w. .

  In the intraocular lens insertion device having the pushing means 130 configured as described above, the cartridge 10 with the intraocular lens 100 attached is attached to the mounting portion 21 and the pushing means 130 is moved forward (to the insertion portion 11 side). I will let you. At this time, a part of the front end side (the side not connected to the optical unit 110) of the support unit 120 b is fitted into the holding unit 132. As a result, the remaining support portion 120b is bent and positioned behind the position where the holding portion 132 is formed. If the support part 120b positioned on the rear side is left in the insertion part 11 for a long time, the optical part 110 may be inclined due to the stress due to the twist. In the first modification, the support portion 120b is pushed out from the insertion portion 11 quickly by the contact portion 135.

  When the optical part 110 is pushed into the eye by the distal end part 131, the optical part 110 is opened in one direction with the support part 120b held in the insertion part 11 as a base point. Further, the support portion 120b is pushed in the contact portion 135, and thus is positioned in the eye before the behavior that the twist is restored is started. Further, when the support portion 120b is pushed out from the insertion portion 11, the pressing of the support portion 120b by the inner wall surface w is released, and the support portion 120b is removed from the holding portion 132, so that the support portion 120b is arranged along the sac in the eye. .

  By using the one-piece type intraocular lens insertion instrument as described above, it is possible to suppress the optical unit 110 from being inclined due to the stress caused by the twist of the support unit 120b, and to move the intraocular lens 100 into the eye earlier. It can be moved. In addition, the opening direction of the optical unit 110 is stably determined in one direction with the support portion 120b positioned in the insertion portion 11 as a base point.

  Next, as a modified example 2 of the intraocular lens insertion device for extruding the one-piece type intraocular lens 100, an intraocular lens corresponding to a case where two sets of support portions 120 are placed in the lateral direction with respect to the extrusion direction. An example of an insertion tool will be described.

  FIG. 10 is an explanatory view of the push-out means 230 of the second modification example as viewed from above. FIG. 10 (a) shows a state in which the intraocular lens 100 is positioned in the insertion portion 11, and FIG. The state where the whole intraocular lens 100 was pushed out from the insertion part 11 is each shown. In FIG. 10, the same configuration as the intraocular lens insertion device 1 will be described using the same figure number.

  A tip portion 231 for extruding the optical unit 110 is formed at the tip of the push-out means 230, and is supported at a position behind the tip portion 231 by a predetermined distance and where the rear support portion 120b is placed. A contact surface 232 for contacting a part of the portion 120b is formed. Note that the contact surface 232 is in contact with the support unit 120 in a state in which the distal end portion 231 is in contact with the optical unit 110, and avoids a region where the vicinity of the base of the support unit 120b does not bend (hard). Should just be arranged.

  When the push-out means 230 is pushed, the tip 231 is brought into contact with the optical part 110, and a part of the support part 120 b whose root side is located on the rear side in the push-out direction is the inner wall surface of the push-out means 30 and the insertion part 11. It abuts against the abutment surface 232 while being held between w. In this state, when the optical unit 110 is pushed by the contact surface 232, the support unit 120b is twisted in the insertion unit 11 due to the behavior of the optical unit 110 being folded. When the optical part 110 is pushed out from the insertion part 11 by the contact surface 232, the optical part 110 is based on the rear support part 120 b held between the pushing means 230 and the inner wall surface w of the insertion part 11. , Open in one direction. When the push-out means 230 is further pushed, the rear support portion 120b pushed by the contact surface 232 is pushed out from the insertion portion 11.

  By using the intraocular lens insertion device having the above-described configuration, the optical unit 110 is not prevented from being tilted due to the stress caused by the twist of the rear support unit 120b, and the opening operation of the optical unit 110 is prevented. It is performed stably in a certain direction.

  Furthermore, in this embodiment, although the example which attaches an intraocular lens to an insertion instrument main body using a cartridge was given and demonstrated, it does not restrict to this. For example, the pushing means having the above-described configuration may be incorporated into an intraocular lens insertion device of a type that does not have a cartridge and is directly installed on the insertion device body.

It is the schematic external view which showed the external appearance of the intraocular lens insertion instrument. It is explanatory drawing of a structure of a 3 piece type intraocular lens. It is explanatory drawing of a structure of a cartridge. It is explanatory drawing of a structure of a cartridge. It is the perspective view which showed typically the external appearance structure of the cylinder part. It is explanatory drawing of the internal structure of a cylinder part. It is explanatory drawing of extrusion operation of the intraocular lens. It is explanatory drawing of a structure of 1 piece type intraocular lens. It is explanatory drawing of extrusion operation of the intraocular lens insertion instrument of the example 1 of a change. It is explanatory drawing of extrusion operation of the intraocular lens insertion instrument of the example 2 of a change.

DESCRIPTION OF SYMBOLS 1 Intraocular lens insertion instrument 11 Insertion part 30 Plunger 34, 131,231 Tip part 35,135,232 Contact surface 40,100 Intraocular lens 41,110 Optical part 42,120 Support part

Claims (4)

In an intraocular lens insertion device for folding an intraocular lens having an optical part and a support part for supporting the optical part in the eye and sending it into the eye,
An insertion section for inserting the intraocular lens from an incision placed on the eyeball, the intraocular lens being placed inside;
An insertion device body having a cylindrical structure provided with the insertion portion at the tip;
A plunger provided so as to be movable back and forth in the axial direction within the cylinder of the insertion portion main body in order to push out the intraocular lens from the insertion portion;
With
The intraocular characterized in that the plunger is formed with an abutment surface for abutting against the support portion of the intraocular lens on an axis separated by a predetermined distance from the distal end toward the proximal end. Lens insertion instrument. 2. The intraocular lens insertion device according to claim 1, wherein the abutment surface includes a part of a support portion on the rear side of the intraocular lens in a state where a tip of the plunger is abutted with the optical unit in the insertion portion. An intraocular lens insertion device characterized by being formed at a contact position. 3. The intraocular lens insertion device according to claim 2, wherein the contact surface is formed in a plane substantially perpendicular to the push-out axis of the plunger. 4. The intraocular lens insertion device according to claim 3, wherein the predetermined distance is applied with stress that causes permanent deformation of the rear support portion in a state where the tip of the plunger is in contact with the optical portion. On the axis positioned at the tip of the rear support portion when the rear support portion is extended by the pushing operation from the axis positioned at the maximum diameter including the support portion when not being An intraocular lens insertion device, characterized in that the range is up to.

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