WO2016017772A1

WO2016017772A1 - Intraocular lens insertion instrument

Info

Publication number: WO2016017772A1
Application number: PCT/JP2015/071686
Authority: WO
Inventors: 佐藤　隆史
Original assignee: 興和株式会社
Priority date: 2014-07-30
Filing date: 2015-07-30
Publication date: 2016-02-04
Also published as: JPWO2016017772A1; JP7066320B2

Abstract

Provided is an intraocular lens insertion instrument that can make the posture of an intraocular lens, which is ejected from the insertion instrument, more stable. An intraocular lens insertion instrument comprises: an instrument body having an insertion tube through which an intraocular lens moves, the intraocular lens having a lens body and a support section connected to the lens body via a connection section; and an intraocular lens storage section. A slit is provided that extends from an opening in a leading end of the insertion tube to a rear end thereof. The connection section of the support section is arranged so as to deviate from a central axis of the instrument body in a prescribed direction in a projection view of the body of the insertion instrument from an optical axis direction of the intraocular lens in a state where the intraocular lens is stored in the storage section. In a front view of the instrument body, when seen along the central axis of the instrument body, a width-direction position of the center of the slit is arranged tilted at a prescribed angle in the same direction as the connection section of the support section of the intraocular lens stored in the storage section with respect to a rearward direction along the optical axis of the intraocular lens in the instrument body.

Description

Intraocular lens insertion device

The present invention relates to an intraocular lens insertion device.

Intraocular lenses that are inserted as a substitute for the lens for the replacement of the human turbid lens and the correction of refraction in the treatment of cataract are being put to practical use. In intraocular lens insertion surgery for cataract treatment, for example, a few millimeter incision wound (incision) is provided at the edge of the cornea, and the lens is crushed and removed from the incision by ultrasonic phacoemulsification The intraocular lens is inserted and fixed.

In recent years, when an intraocular lens is inserted into an eyeball through an incision, an insertion device in which the intraocular lens is previously loaded in a cartridge is often used. The user inserts the distal end opening of the insertion tube portion provided at the distal end portion of the instrument body into the eyeball through the above-mentioned incision, and in the state where the intraocular lens is slightly deformed in the instrument body, The intraocular lens is ejected and inserted into the eyeball by pushing it out from the tip opening with a rod-like plunger. By using such an insertion device, the size of the incision can be reduced, and the intraocular lens can be easily inserted into the eyeball, so that the burden on the operation can be reduced.

Generally, an intraocular lens has a lens body and a support portion connected to the lens body. When the intraocular lens is inserted into the eyeball using the above-described insertion device, the intraocular lens is folded in accordance with the inner wall shape of the insertion tube portion as the plunger moves the intraocular lens toward the distal opening side. It becomes a state. At this time, in order to stabilize the posture of the intraocular lens when the intraocular lens once folded is emitted from the distal end of the insertion instrument, the distal end portion of the insertion instrument is inclined with respect to the central axis. The structure which provides what is called a bevel is proposed (for example, patent document 1).

JP 2012-249678 A

However, in the conventional intraocular lens insertion device, since the tip of the insertion device is only provided with a bevel, the posture of the intraocular lens emitted from the distal end of the insertion device may still not be determined. . For this reason, the user performs an operation such as changing the posture of the insertion instrument itself so that the intraocular lens is ejected in a suitable posture, or adjusting the position of the intraocular lens ejected into the eye. Take measures.

The technology of the present disclosure has been made in view of the above circumstances, and an object thereof is to provide an intraocular lens insertion device that can further stabilize the posture of the intraocular lens emitted from the insertion device. Is to provide.

The intraocular lens insertion device of the present disclosure includes a lens body and an instrument body having an insertion tube portion at the tip end of which an intraocular lens having a support portion having one end connected to the lens body via a connection portion, An insertion device for an intraocular lens including a storage unit for storing an intraocular lens, provided with a slit extending in the longitudinal direction of the insertion tube portion from the opening at the front end of the insertion tube portion toward the rear end, In the projection view from the optical axis direction of the intraocular lens of the main body of the insertion instrument in a state where the intraocular lens is accommodated in the accommodating part, the connection part of at least one support part is relative to the central axis of the instrument main body The center position in the width direction of the slit is the rear side of the optical axis of the intraocular lens in the instrument body when viewed from the center axis of the instrument body in the front view of the instrument body. In contrast, the intraocular lens stored in the storage unit It is arranged to be inclined at a predetermined angle in the same direction as the connection portion of the at least one support. Thereby, since the support part of an intraocular lens is extruded from a slit, possibility that the attitude | position of a lens main body and by extension, an intraocular lens will be changed by a support part can be suppressed. Here, the predetermined angle coincides with the position of the connection part when the intraocular lens passes through the insertion tube part when the center position in the width direction of the slit is viewed from the central axis of the instrument body in a front view of the instrument body. It is an angle to do.

Preferably, the intraocular lens insertion device is configured such that the predetermined angle is about 30 °. Accordingly, when a general intraocular lens is ejected into the eye using the intraocular lens insertion device disclosed herein, the intraocular lens support can be more reliably ejected from the slit, and thus the eye The posture at the time of injection of the inner lens is preferably maintained.

According to the technology disclosed herein, it is possible to provide an intraocular lens insertion device that can further stabilize the posture of the intraocular lens emitted from the insertion device.

It is a figure which shows schematic structure of the insertion instrument of the intraocular lens in one Embodiment. It is a figure which shows schematic structure of the intraocular lens in one Embodiment. It is a figure which shows schematic structure of the nozzle main body in one Embodiment. It is a figure which shows schematic structure of the positioning member in one Embodiment. It is a figure which shows schematic structure of the plunger in one Embodiment. It is a figure which shows schematic structure of the front-end | tip of the nozzle main body in one Embodiment. It is a figure which shows the front-end | tip of the nozzle main body and intraocular lens in one Embodiment. It is a schematic diagram which shows the attitude | position of the intraocular lens in the case of inject | emitting the intraocular lens in one Embodiment from a nozzle main body. It is a figure which shows schematic structure of the insertion instrument of the intraocular lens in one modification. It is a figure which shows schematic structure of the plunger in one modification. It is a figure which shows the insertion instrument and intraocular lens of the intraocular lens in one modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

〔Example〕
In FIG. 1, schematic structure of the insertion instrument 1 of this embodiment is shown. 1A is a plan view of the insertion instrument 1 when the stage lid 13 is opened, and FIG. 1B is a side view of the insertion instrument 1 when the stage lid 13 is closed. The insertion instrument 1 has a nozzle body 10 as an instrument body, a plunger 30 as an intraocular lens pushing member, a stage part 12 and a stage lid part 13 as a storage part for an intraocular lens. The stage unit 12 is provided integrally with the nozzle body 10 or separately. A plunger 30 is inserted into the nozzle body 10. The intraocular lens 2 is set on the stage unit 12. The stage unit 12 is formed integrally with the stage lid unit 13. FIG. 1 shows a state in which the stage lid 13 is opened.

The nozzle body 10 of the insertion instrument 1 is formed in a cylindrical shape having a substantially rectangular cross section, and one end of the insertion tool 1 is greatly open (hereinafter, the side having the large opening is referred to as a rear end 10b), and the end on the other side. Includes a nozzle portion 15 and a tip portion 10a which are narrowed down. As shown in FIG.1 (b), the front-end | tip part 10a is opening diagonally. The plunger 30 is inserted into the nozzle body 10 and can reciprocate. In addition, a slit 15 b is formed in the nozzle portion 15. Details of the slit 15b will be described later.

In the following description, the direction from the rear end 10b of the nozzle body 10 to the front end 10a is the front direction, the opposite direction is the rear direction, the front side of the page in FIG. 1A is the upper direction, and the reverse direction is the lower direction. In FIG. 1B, the front side of the page is the left direction, and the opposite direction is the right direction. In this case, the upper side is the front side of the optical axis of the lens body 2a, which will be described later, the lower side is the rear side of the optical axis of the lens body 2a, the front side is the front side in the pressing direction by the plunger 30, and the rear side is pressed by the plunger 30 Corresponds to the rear side.

In the vicinity of the rear end portion 10b of the nozzle body 10, there is integrally provided a holding portion 11 that protrudes in a plate shape and hooks a finger when the user pushes the plunger 30 into the front end side of the nozzle body 10. A stage portion 12 for setting the intraocular lens 2 is provided on the rear side of the nozzle portion 15 in the nozzle body 10. The stage portion 12 is configured such that the upper side of the nozzle body 10 is opened by opening the stage lid portion 13. Further, a positioning member 50 is attached to the stage portion 12 from the lower side of the nozzle body 10. By this positioning member 50, the intraocular lens 2 is stably held in the stage portion 12 even before use (during transportation).

That is, in the insertion instrument 1, the intraocular lens 2 is on the stage unit 12 and the front side of the optical axis is on the upper side in a state where the stage lid unit 13 is opened and the positioning member 50 is attached to the stage unit 12. Is set as Then, after the stage lid 13 is closed, it is shipped and sold. Then, the user removes the positioning member 50 with the stage lid portion 13 closed, and then pushes the plunger 30 into the distal end side of the nozzle body 10. As a result, the intraocular lens 2 is pressed by the plunger 30 and moved to the nozzle unit 15, and then the intraocular lens 2 is injected into the eyeball from the distal end portion 10 a. In addition, the nozzle body 10, the plunger 30, and the positioning member 50 in the insertion instrument 1 are formed of a resin material such as polypropylene. Polypropylene is a material with a proven track record in medical equipment and high reliability such as chemical resistance.

FIG. 2 is a diagram showing a schematic configuration of the intraocular lens 2. 2A is a plan view and FIG. 2B is a side view. The intraocular lens 2 is a so-called one-piece type. The intraocular lens 2 is formed of a lens body 2a having a predetermined refractive power and two flat plate-like support portions 2b connected to the lens body 2a for holding the lens body 2a in the eyeball. Yes. Some intraocular lenses have not only refractive correction but also optical functions such as astigmatism correction, bifocal (multifocal) and identity with the visual axis. In the case of an intraocular lens for correcting astigmatism, as shown in FIG. 2C, a marking 2d indicating the position of the main meridian is applied to the lens. In the case of a multifocal lens, a diffraction grating shape 2e appears on the lens surface. Furthermore, by shifting the center of the lens body 2a and the center of the shape 2e of the diffraction grating, it is possible to cope with the deviation of the visual axis of the individual into which the intraocular lens is inserted. On the other hand, the support part 2b has a junction part 2c that contacts the outer edge of the lens body 2, and the junction part 2c and the lens body 2a are connected by an adhesive or the like. The junction part corresponds to an example of a connection part. The lens body 2a and the support portion 2b are made of a flexible resin material. In the insertion instrument 1 in the present embodiment, the intraocular lens 2 is set so that one of the two support portions 2b is disposed on the rear side of the lens body 2a and the other is disposed on the front side of the lens body. .

FIG. 3 shows a plan view of only the nozzle body 10. As shown in FIG. 1 described above, in the nozzle body 10, the intraocular lens 2 is set on the stage unit 12. In this state, the intraocular lens 2 is pressed by the plunger 30 and ejected from the distal end portion 10a. The nozzle body 10 is provided with a through-hole 10c having a cross-sectional shape that becomes smaller toward the tip according to the shape that the outer shape of the nozzle body 10 becomes thinner toward the tip. In addition, although the cross-sectional shape of the through hole is an oval shape (egg shape) in the embodiment diagram, it may be a circular shape or an oval shape for the convenience of the lens used or specifications. And when the intraocular lens 2 is inject | emitted, the intraocular lens 2 will be in the state which deform | transformed and folded according to the change of the cross-sectional shape of the through-hole 10c in the nozzle main body 10, and is formed in a patient's eyeball. After being transformed into a shape that makes it easy to enter an incision, it is injected.

Further, the tip portion 10a has a shape cut obliquely so that the upper region of the nozzle portion 15 is in front of the lower region. Note that the shape of the tip portion 10a that is obliquely cut may be linearly obliquely cut when viewed from the left-right direction, or may have a bulge outward, that is, a curved shape. It may be cut into

A stage groove 12 a having a width slightly larger than the diameter of the lens body 2 a of the intraocular lens 2 is formed in the stage portion 12. The dimension in the front-rear direction of the stage groove 12 a is set to be larger than the maximum width dimension including the support portions 2 b extending on both sides of the intraocular lens 2. A set surface 12b is formed by the bottom surface of the stage groove 12a. The vertical position of the set surface 12b is set higher than the height position of the bottom surface of the through hole 10c of the nozzle body 10, and the set surface 12b and the bottom surface of the through hole 10c are connected by a bottom slope 10d. .

The stage portion 12 and the stage lid portion 13 are integrally formed. The stage lid portion 13 has the same size in the front-rear direction as the stage portion 12. The stage lid portion 13 is connected by a thin plate-like connecting portion 14 formed by extending the side surface of the stage portion 12 to the stage lid portion 13 side. The connecting portion 14 is formed to be bendable at the center portion, and the stage lid portion 13 can be closed by overlapping the stage portion 12 from above by bending the connecting portion 14.

In the stage lid 13,

ribs

13 a and 13 b are provided on the surface facing the set surface 12 b when the lid is closed in order to reinforce the stage lid 13 and stabilize the position of the intraocular lens 2. Further, a guide protrusion 13 c is provided as a guide on the upper side of the plunger 30.

A positioning member 50 is detachably provided below the set surface 12b of the stage portion 12. FIG. 4 shows a schematic configuration of the positioning member 50. FIG. 4A shows a plan view of the positioning member 50, and FIG. 4B shows a left side view of the positioning member 50. The positioning member 50 is configured as a separate body from the nozzle body 10, and has a structure in which a pair of side wall portions 51 are connected by a connecting portion 52. A holding portion 53 is formed at the lower end of each side wall portion 51 so as to extend outward.

Further, a pair of first mounting portions 54 are formed on the upper end portions of the respective side wall portions 51. The pair of first mounting portions 54 are formed in an arc shape when viewed from above and project upward. Further, a first positioning portion 55 is formed on the outer peripheral side of the upper end surface of the first placement portion 54 so as to protrude. The distance between the inner diameters of the first positioning portion 55 is set to be slightly larger than the diameter dimension of the lens body 2 a of the intraocular lens 2.

Further, a pair of second placement portions 56 are formed at both ends in the front-rear direction of the connecting portion 52, and the shape viewed from above is a rectangular shape and protrudes upward. The height of the upper surface of the second placement unit 56 is equal to the height of the upper surface of the first placement unit 54. Further, a second positioning portion 57 that further protrudes upward over the entire left and right direction of the second placement portion 56 is formed on the outer portion of the upper surface of the second placement portion 56. The distance between the inner sides of the second positioning portion 57 is set slightly larger than the diameter of the lens body 2a of the intraocular lens 2. In addition, a locking claw 58 that slightly protrudes in the front-rear direction is formed on the upper end portion of the second placement portion 56 over the entire left-right direction.

The positioning member 50 is assembled from below the set surface 12b of the nozzle body 10. The set surface 12b of the nozzle body 10 is formed with a set surface through hole 12c that penetrates the set surface 12b in the thickness direction. The outer shape of the set surface through hole 12c is substantially similar to the shape of the first mounting portion 54 and the second mounting portion 56 of the positioning member 50 as viewed from above. When the positioning member 50 is attached to the nozzle body 10, the first placement portion 54 and the second placement portion 56 are inserted into the set surface through hole 12c from the lower side of the set surface 12b, and the set surface 12b. Protrudes above.

At that time, the locking claw 58 provided in the second positioning portion 57 protrudes to the set surface 12b through the set surface through hole 12c and is locked to the upper surface of the set surface 12b. As a result, the positioning member 50 is assembled from the lower side of the nozzle body 10, and the first placement portion 54 and the second placement portion 56 are fixed in a state of protruding from the set surface 12b. When the intraocular lens 2 is set on the setting surface 12b, the bottom surface of the outer periphery of the lens body 2a is placed on the upper surfaces of the first placement unit 54 and the second placement unit 56. Further, the position of the lens body 2a is restricted with respect to the horizontal direction (direction horizontal to the set surface 12b) by the first positioning portion 55 and the second positioning portion 57.

When inserting the intraocular lens 2 into the eyeball, the positioning member 50 is removed from the nozzle body 10. Thereby, the 1st mounting part 54 and the 2nd mounting part 56 which were supporting the lens main body 2a of the intraocular lens 2 retreat from the set surface 12b, and the intraocular lens 2 can move on the set surface 12b. Placed. Then, the intraocular lens 2 is pushed forward to a predetermined position by the plunger 30.

Subsequently, the distal end portion 10a of the nozzle portion 15 of the nozzle body 10 is inserted into the incision provided in the eye tissue. Since the distal end portion 10a has an oblique opening shape, it can be easily inserted into the incision. Then, after inserting the nozzle portion 15 into the incision, the pressing plate portion 33 of the plunger 30 is again pushed into the distal end side of the nozzle body 10. As a result, the distal end of the action portion 31 of the plunger 30 comes into contact with the outer periphery of the lens body 2a of the intraocular lens 2 set on the set surface 12a, and the intraocular lens 2 is guided toward the distal end portion 10a by the plunger 30. The

Next, FIG. 5 shows a schematic configuration of the plunger 30. The plunger 30 has a slightly larger longitudinal length than the nozzle body 10. And it forms from the action part 31 of the front end side based on a column shape, and the insertion part 32 of the rear end side based on a rectangular rod shape. And the action part 31 is comprised including the cylindrical part 31a made into the column shape, and the thin plate-shaped flat part 31b extended in the left-right direction of the cylindrical part 31a.

A notch 31 c is formed at the tip of the action part 31. As shown in FIG. 5A, the notch 31c is formed in a groove shape that opens upward in the action portion 31 and penetrates in the left-right direction. Further, as shown in FIG. 5B, the groove wall on the distal end side of the notch 31 c is formed with an inclined surface that goes upward as it goes to the distal end side of the action portion 31. On the other hand, the insertion part 32 has a substantially H-shaped cross section as a whole, and the horizontal and vertical dimensions thereof are set slightly smaller than the through hole 10 c of the nozzle body 10. In addition, a disc-shaped pressing plate portion 33 is formed at the rear end of the insertion portion 32 so as to spread in the vertical and horizontal directions.

A claw portion 32 a that protrudes upward from the insertion portion 32 and that can move up and down by the elasticity of the material of the plunger 30 is formed at a portion of the insertion portion 32 that is ahead of the center in the front-rear direction. When the plunger 30 is inserted into the nozzle body 10, the locking hole 10e shown in FIG. 3 provided in the thickness direction on the upper surface of the nozzle body 10 and the claw portion 32a are engaged. The relative position between the nozzle body 10 and the plunger 30 in the initial state is determined. It should be noted that the claw portion 32a and the locking hole 10e are formed at the positions where the distal end of the action portion 31 is located on the rear side of the lens body 2a of the intraocular lens 2 set on the stage portion 12 in the engaged state. The support portion 2b on the rear side of the main body 2a is set so that the cutout portion 31c can be supported from below.

Before the intraocular lens 2 of the insertion instrument 1 configured as described above is stored, the plunger 30 is inserted into the nozzle body 10 and disposed at the initial position. Further, as described above, the positioning member 50 is attached to the nozzle body 10 from below the set surface 12b. Thereby, the 1st mounting part 54 and the 2nd mounting part 56 of the positioning member 50 are hold | maintained in the state protruded to the set surface 12b.

Next, the lens body 2 a of the intraocular lens 2 is placed and positioned on the upper surfaces of the first placement part 54 and the second placement part 56 in a state where the support part 2 b is directed in the front-rear direction of the nozzle body 10. In this state, a part of the support portion 2b on the rear side of the intraocular lens 2 is sandwiched between the notches 31c of the plunger 30 and is supported by the bottom surface thereof.

FIG. 6 is a side view schematically showing the tip of the nozzle body 10 of the insertion instrument 1 in the present embodiment. As shown in the front view of the nozzle body 10 in FIG. 7, the central axis of the cylindrical nozzle portion 15 extending in the front-rear direction of the nozzle body 10 is AX (two-dot chain line in FIG. 6). As shown in FIG. 6, so-called bevel processing is performed in which the tip of the nozzle portion 15 of the nozzle body 10 is cut by a surface inclined so as to face the lower side of the nozzle portion 15 with respect to the central axis AX. Thereby, the opening 15a at the tip of the nozzle portion 15 is formed so as to be a so-called bevel down.

In the present embodiment, as shown in FIG. 6, a slit 15b connected to the opening 15a of the nozzle portion 15 is provided. The slit 15 b is a substantially V-shaped cut extending from the rear end side of the opening 15 a of the nozzle portion 15 to the rear end side of the nozzle portion 15. As will be described later with reference to FIG. 7, the edge of the slit 15b has a tapered shape, and the tapered shape continues to the rear end 15c of the slit 15b. Since the edge of the slit 15b is formed in this way, the insertion property when the opening 15a and the slit 15b of the nozzle portion 15 are inserted from an incision of an eye tissue is improved.

Therefore, in the present embodiment, the positional relationship between the intraocular lens 2 and the slit 15b when the intraocular lens 2 is set on the stage unit 12 is below the nozzle unit 15 when viewed from the central axis AX of the nozzle unit 15. With respect to the direction, the slit 15b and the junction part 2c of the support part 2b on the rear end side of the nozzle body 10 are in the positional relationship on the same side. Details of the movement of the intraocular lens 2 emitted from the slit 15b will be described later.

FIG. 7 shows a cross section taken along line AA of FIG. 6 as viewed from the front of the nozzle body 10. FIG. 7 also shows a part of the nozzle body 10 when the nozzle body 10 is viewed from the front. FIG. 7 also shows an example of the lens body 2 a of the intraocular lens 2 moved to the nozzle unit 15. In FIG. 7, a gap is provided between the lens body 2a of the intraocular lens 2 and the nozzle portion 15 for ease of viewing, but the lens body 2a and the inner wall of the nozzle portion 15 are actually in contact with each other.

As shown in FIG. 7, the slit 15b of the nozzle portion 15 is provided so as to open by a predetermined width around a direction D2 inclined by a predetermined angle θ (≠ 0 °) from the lower direction D1 when viewed from the central axis AX. It has been. Here, the downward direction D1 corresponds to the rear direction of the optical axis of the lens body 2a of the intraocular lens 2 set on the stage unit 12. Further, as shown in FIG. 7, in the cross section perpendicular to the central axis AX of the nozzle portion 15, the edge 15c of the nozzle portion 15 forming the slit 15b is formed in a tapered shape.

When the intraocular lens 2 is ejected into the eye from the tip of the nozzle body 10, when the intraocular lens 2 is pushed forward by the plunger 30 toward the tip side of the nozzle body 10, of the support portion 2 b of the intraocular lens 2. The positional relationship that the junction 2c and the slit 15b of the support 2b on the rear end side of the nozzle body 10 are on the same side with respect to the downward direction of the nozzle 15 as viewed from the central axis AX of the nozzle 15 is maintained. Is done. The relative positional relationship between the lens body 2 a and the support portion 2 b of the intraocular lens 2, the position of the junction portion 2 c when the intraocular lens 2 is set on the stage portion 12, and the intraocular lens 2 in the nozzle portion 15. By setting the angle θ in consideration of the folded state or the like, the support portion 2b of the intraocular lens 2 can be suitably emitted from the slit 15b.

When a general intraocular lens is injected into the eye using the insertion instrument 1 of the present embodiment, if the angle θ is about 30 °, the orientation of the intraocular lens is adjusted by rotating the insertion instrument 1 or the like. It is not necessary, and an effect that the intraocular lens can be emitted in the eye while maintaining a suitable posture is expected. The opening width of the slit 15b can be set as appropriate. Here, the angle θ corresponds to a predetermined angle in the present embodiment.

FIG. 8 is a top view schematically showing the posture of the intraocular lens 2 when the intraocular lens 2 moves in the nozzle body 10 by the operation of the plunger 30 in the present embodiment. In FIG. 8, the user pushes the plunger 30 toward the distal end side of the nozzle body 10, and the intraocular lens 2 is sequentially moved from FIG. 8A to FIG. 8B, FIG. 8C, FIG. Move. In FIG. 8, the nozzle body 10 is indicated by a dotted line, and the intraocular lens 2 and the plunger 30 are indicated by a solid line for ease of viewing.

First, the user operates the plunger 30 to move the intraocular lens 2 placed on the stage unit 12 to the tip side of the nozzle body 10. As shown in FIG. 8A, the intraocular lens 2 is pushed by the plunger 30, and the outer edge of the lens body 2 a is in contact with the inner wall of the nozzle body 10. When the intraocular lens 2 is pushed by the plunger 30 and further moves to the tip side of the nozzle body 10, the outer edge portion of the lens body 2 a is the through hole of the nozzle body 10 as shown in FIG. The lens body 2a is folded toward the center (optical axis) according to the cross-sectional shape of 10c. Of the two support portions 2b of the intraocular lens 2, the support portion 2b on the distal end side of the nozzle body 10 abuts against the inner wall of the nozzle body 10, and then the lens body 2a moves and folds over the lens body 2a. In a so-called tucked state.

Then, when the intraocular lens 2 is pushed by the plunger 30 and moves to the tip side of the nozzle body 10, the tacked support portion 2b is pushed out of the nozzle body 10 from the slit 15b, and FIG. It returns to the natural state where it cannot be bent as shown in FIG.

From the state shown in FIG. 8C, the user operates the plunger 30 to move the intraocular lens 2 in the forward direction of the nozzle body 10. At this time, as shown in FIG. 8 (d), the lens body 2a of the intraocular lens 2 was gradually pushed out through the opening 15a or slit 15b of the nozzle portion 15 to the outside of the nozzle body 10. The part is restored from the folded state to the original state.

In the present embodiment, of the two support portions 2b of the intraocular lens 2, the junction portion 2c of the support portion 2b on the rear end side of the nozzle body 10 is leftward from the central axis AX in a top view inside the nozzle body 10. Move out of position. In this case, the predetermined direction means the left direction. Further, as shown in FIG. 7, the center position O in the width direction of the slit 15 b of the nozzle portion 15, that is, the position where the dotted lines D <b> 2 and D <b> 3 intersect, Is located in a direction inclined leftward by an angle θ. Further, as shown in FIG. 8, when the nozzle body 10 is viewed from the top, the slit 15b of the nozzle portion 15 is the same as the junction portion 2c of the support portion 2b on the rear end side of the nozzle body 10 when viewed from the central axis AX. The left side is deviated from the central axis AX.

For this reason, in this embodiment, when the intraocular lens 2 is pushed by the plunger 30 and the support part 2b on the rear end side of the nozzle body 10 moves to the tip of the nozzle body 10, the junction part of the support part 2b 2c moves to a position overlapping the slit 15b when viewed from above. And while the plunger 30 is pushed in the front direction of the nozzle main body 10, the said junction part 2c is extruded to the outer side of the nozzle main body 10 from the slit 15b. When the plunger 30 is further pushed forward of the nozzle body 10 and protrudes from the tip of the nozzle body 10, the intraocular lens 2 is positioned on the rear end side of the nozzle body 10 as shown in FIG. In a state where a part of the support portion 2b is engaged with the plunger 30, the original state is restored.

Here, if the slit 15b is provided on the side (in this case, the right side) different from the junction part 2c of the support part 2b on the rear end side of the nozzle body 10 when viewed from the central axis AX, the above description is given. In the case where the angle θ is approximately 0 °, the support portion 2b and the junction portion 2c on the rear end side of the nozzle body 10 may not be pushed out of the nozzle body 10 through the slit 15b. There is. As shown in FIG. 8, the support portion 2 b on the rear end side of the nozzle body 10 of the intraocular lens 2 is supported by a notch portion 31 c at the distal end of the plunger 30 while being curved by a predetermined amount in the nozzle body 10.

Therefore, the support portion 2b tries to return to a natural state by the elastic restoring force until it is pushed out of the nozzle body 10. For this reason, when the support part 2b moves to the tip side of the nozzle body 10 without passing through the slit 15b, the restorative force causes the intraocular portion when the part other than the support part 2 is pushed outside the nozzle body 10. There is a possibility that the lens 2 takes an unexpected posture. As a result, the user must adjust the posture of the intraocular lens 2 by rotating the insertion instrument 1 around the central axis AX. On the other hand, in this embodiment, the support part 2b on the rear end side of the nozzle body 10 of the intraocular lens 2 is pushed out of the nozzle body 10 through the slit 15b, so that the intraocular lens 2 is emitted from the nozzle body 10. It is possible to suppress the above-described restoring force that is unnecessary when acting on the intraocular lens 2. As a result, a suitable posture of the intraocular lens 2 can be maintained, and the trouble of adjusting the posture of the intraocular lens 2 as described above can be saved.

The above is the description of the present embodiment, but the configuration of the insertion portion and the like is not limited to the above-described embodiment, and various modifications can be made within the scope that does not lose the technical idea of the present invention. Is possible. For example, in the above description, the slit 15b of the nozzle portion 15 is formed as a substantially V-shaped cut, but the shape of the slit 15b is not limited to this, and an arbitrary shape can be adopted.

In the above description, when the nozzle body 10 is viewed from the top, the slit 15b of the nozzle portion 15 is the same side as the junction portion 2c of the support portion 2b on the “rear end side” of the nozzle body 10 when viewed from the central axis AX. In addition, the configuration is formed so as to deviate from the central axis AX. However, instead of this configuration, when the nozzle body 10 is viewed from the top, the slit 15b of the nozzle portion 15 is the same side as the junction portion 2c of the support portion 2b of the “tip side” of the nozzle body 10 when viewed from the central axis AX. In addition, it may be configured to be formed away from the central axis AX. As described above, since the support portion 2b on the front end side of the nozzle body 10 is in a state of being tucked in the nozzle body 10, in the nozzle body 10, similarly to the support portion 2b on the rear end side of the nozzle body 10, It is trying to return to a natural state by elastic restoring force. For this reason, when parts other than the support part 2 are inject | emitted, the restoring force of the support part 2 may cause the intraocular lens 2 to be in an unexpected posture. Therefore, when the intraocular lens 2 is emitted from the nozzle body 10 by forming the slit 15b so as to be emitted from the nozzle body 10 first from the junction portion 2c of the support portion 2b on the distal end side of the nozzle body 10. Therefore, it is possible to save the trouble of adjusting the posture of the intraocular lens 2 as described above.

Further, with respect to the intraocular lens 2 set on the stage unit 12, when the nozzle body 10 is viewed from above, the support portions 2 b on the front end side and the rear end side of the nozzle body 10 are centered on the same side as viewed from the center axis AX. When it is off the AX, the slit 15b is formed on the same side as the support portion 2b, so that a suitable posture is maintained when the intraocular lens 2 is ejected from the nozzle body 10 as described above. Can do.

The following is a modification of the above embodiment. In the following description, components corresponding to the components in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted unless otherwise specified.

FIG. 9 shows a modification of the intraocular lens insertion device 1 in the above embodiment. FIG. 10 shows the plunger 300 of the insertion instrument 100 of this modification. 10C and 10D are views showing the relationship between the plunger 300 and the insertion portion 32 when the plunger 300 is viewed from the front side or the rear side of the insertion instrument 100. FIG. As shown in FIGS. 10 (c) and 10 (d), in the insertion instrument 100 of this modification, the pressing plate portion 330 of the plunger 300 is viewed when the plunger 300 is viewed from the front side or the rear side of the insertion instrument 100. It is formed to be a substantially regular hexagon. In addition, the shape of the press plate part 330 can be made into a free shape as long as the operation feeling of the plunger 300 for the user is not impaired. Therefore, in consideration of the design of the insertion instrument 100, the shape of the pressing plate portion 330 can be selected as appropriate, such as a circle, a square, and other polygons.

FIG. 11 schematically shows a front view of the insertion instrument 100 of this modification as viewed from the front side of the insertion instrument 100. In FIG. 11, for ease of viewing, the size ratio between the parts of the insertion instrument 100 is different from that of the actual insertion instrument. As shown in FIG. 11, the hold unit 11 has a shape in which so-called “brims” extend in the vertical direction so that the user can easily put his / her finger on the corner, and the four corners of the brim have an angle of about 5 ° to 15 °. Chamfered. Thereby, the hold part 11 has a vertically long octagonal shape in a front view. Furthermore, as shown in FIG. 11, the pressing plate portion 330 has a substantially regular hexagonal shape.

DESCRIPTION OF SYMBOLS 1 Insertion tool 2 Intraocular lens 2a Lens main body

2b Support part

2c Junction part 10 Nozzle main body 15 Nozzle part 15a Nozzle part opening 15b Nozzle part slit 30 Plunger

Claims

An instrument main body having an insertion tube part at the tip of which an intraocular lens moves, the lens main body and a support part having one end connected to the lens main body via a connection part;
An intraocular lens insertion device comprising a storage unit for storing the intraocular lens,
A slit extending in the longitudinal direction of the insertion cylinder part from the opening at the front end of the insertion cylinder part toward the rear end is provided,
In a projection view from the optical axis direction of the intraocular lens of the body of the insertion instrument in a state where the intraocular lens is housed in the housing part, at least one connecting part of the support part is provided on the body of the instrument. Disposed in a predetermined direction with respect to the central axis,
In the front view of the instrument main body, the center position in the width direction of the slit is stored in the rear direction of the optical axis of the intraocular lens in the instrument main body when viewed from the central axis of the instrument main body. An intraocular lens insertion device disposed at a predetermined angle in the same direction as the connection portion of the at least one support portion of the intraocular lens housed in a portion.
The intraocular lens insertion device according to claim 1, wherein the predetermined angle is about 30 °.
The intraocular lens insertion device according to claim 1 or 2, wherein the intraocular lens is housed in the housing portion before the insertion device is distributed.