JP2023157127A - Intraocular lens and manufacturing method of intraocular lens support part - Google Patents

Abstract

To provide an intraocular lens in which a distal end side of a support part can be easily removed from the inside to the outside of the eye even though a folding part is not formed in the distal end side.SOLUTION: A distal end 31 of a support part 3 of an intraocular lens 1 is a large-width part having a width larger than a width of another portion 32. The large-width part 31 is a portion that hooks to a tool of removing a distal end side of the support part 3 from the inside to the outside of the eye. The large-width part 31 is formed in a shape protruding to both region sides when being divided into two regions with an axial line L1 of the support part 3 as a boundary in a cross section including the axial line L1 in a surface. In other words, the large-width part 31 is formed in a shape protruding in a direction of crossing an extension direction of the support part 3 over the entire periphery around the axial line L1. A width of the large-width part 31 in a direction at the right angle with respect to the extension direction of the support part 3 is 0.2 mm to 0.6 mm.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to intraocular lenses.

BACKGROUND ART Conventionally, intraocular lenses have been known that include a lens portion and a support portion that linearly extends from the lens portion and is supported by a portion of the eyeball (for example, see Patent Document 1). In the intraocular lens described in Patent Document 1, a part of the haptic serving as the support part from the tip is folded back in the opposite direction to form a folded part. Moreover, Patent Document 1 proposes a medical instrument that is hooked on the folded part of the support part and taken out from the inside of the eye to the outside of the eye.

Patent No. 6045659

If a folded portion is not formed on the distal end side of the support portion, the distal end cannot be easily brought out from the inside of the eye to the outside of the eye.

The present disclosure provides an intraocular lens whose distal end can be easily taken out of the eye from the inside of the eye without forming a folded part on the distal end of the support, and a method for manufacturing the intraocular lens support. The task is to do so.

The intraocular lens of the present disclosure includes:
a lens section;
a support part extending linearly from the lens part and supported by the eyeball part,
The tip of the support part is a wide part that is wider than other parts,
The wide portion is a portion on which the distal end side of the support portion is hooked to an instrument that takes the support portion out of the eye from within the eye.

According to this, since the wide portion is provided at the distal end of the support portion, the wide portion can be hooked onto an instrument that brings the distal end side of the support portion out of the eye. This allows the distal end of the support portion to be easily brought out of the eye from within the eye without forming a folded portion on the distal end thereof.

Further, the method for manufacturing the intraocular lens support part of the present disclosure includes:
A linearly extending support part is prepared, one end of which is connected to the lens part to be inserted into the eye, and the other end is supported by the part of the eyeball, and the support part is used before being inserted into the eye. The tip of the support part is heated to form a thermally deformed part that protrudes in a direction intersecting the extending direction of the support part.

According to this, it is possible to obtain an intraocular lens support part having a thermally deformable part having a shape protruding in a direction intersecting the extending direction of the support part at the distal end. This thermally deformed portion can then be hooked onto an instrument that brings the distal end side of the support portion out of the eye. This allows the distal end of the support portion to be easily brought out of the eye from within the eye without forming a folded portion on the distal end thereof.

FIG. 2 is a front view of an intraocular lens. FIG. 3 is a sectional view of the distal end side of the support portion. FIG. 3 is a plan view of the tip of the support portion. FIG. 3 is a front view of a basic intraocular lens in which the distal end of the support portion does not have a wide shape. FIG. 2 is a front view of an intraocular lens having a thermally deformable portion at the tip of the support portion. FIG. 2 is a diagram showing a state in which an intraocular lens is inserted into the eye, and a state in which an instrument such as forceps is inserted into the eye in order to bring the distal end side of the support portion of the intraocular lens out of the eye. . FIG. 7 is an enlarged view of section A in FIG. 6, showing a state in which the tip of the support portion is hooked on a tool such as forceps. FIG. 3 is a diagram showing a state in which the distal end side of the support portion of the intraocular lens is taken out of the eye. FIG. 6 is a diagram showing a state in which a thermally deformable part for fixing the eyeball is formed at the tip of the support part taken out of the eye. FIG. 6 is a diagram showing a state in which the thermally deformed portion at the tip of the support portion is embedded in the sclera, and a state in which the intraocular lens is attached to the eyeball. FIG. 7 is a plan view of the tip of the support portion according to Modification Example 1, and is a diagram showing the tip of the support portion having a shape that protrudes in two directions. FIG. 7 is a plan view of the tip of the support portion according to Modification Example 2, and is a diagram showing the tip of the support portion having a shape that protrudes in four directions. FIG. 2 is a front view of an intraocular lens in which the distal end of the support portion is formed into a bead shape. FIG. 14 is a sectional view of the distal end side of the support portion in FIG. 13;

Embodiments of the present disclosure will be described below with reference to the drawings. FIG. 1 shows an intraocular lens 1 (Intraocular Lens: IOL) of this embodiment. The intraocular lens 1 includes a lens portion 2 and two support portions 3 as main components. The intraocular lens 1 is configured as a three-piece intraocular lens in which the lens part 2 and the support part 3 are made of different materials. In addition to the three-piece type intraocular lens, there is also a one-piece type intraocular lens in which the lens part and the support part are integrally molded from the same material.

The lens 2 portion is formed, for example, in a disc shape. For example, the lens part 2 is removed after a crystalline lens that has become cloudy due to a cataract is removed from the patient's eye (total or partial removal), and then placed in the posterior chamber of the eye (or the posterior chamber of the eye, that is, the area behind the iris). It takes over the lens function of the crystalline lens. The lens portion 2 is made of a resin material such as acrylic or silicone. Further, the lens portion 2 is formed of a material having flexibility (in other words, elasticity or flexibility) so that it can be rolled into a rod shape and inserted into the eye using an injector or the like.

The support portion 3 is a portion that supports the lens portion 2 within the posterior chamber. The support portion 3 is provided so as to extend linearly from the outer peripheral edge of the lens portion 2 . Specifically, the support portion 3 extends from two locations on the outer peripheral edge of the lens portion 2 in a pair of loop shapes (in other words, an arc shape, a leg shape, or a haptic shape), as shown in FIG. When viewed from the front direction, the lens portion 2 has a point-symmetrical shape with respect to the center O of the lens portion 2 . In other words, the support portion 3 has a shape that is line symmetrical with respect to the optical axis of the lens portion 2 . Note that the optical axis of the lens portion 2 is, for example, a straight line passing through the center O of the lens portion 2 and extending in a direction perpendicular to the paper surface of FIG. Specifically, the loop shape of the support portion 3 is a curved shape that extends outward in the radial direction with respect to the optical axis, and also extends in the circumferential direction (particularly on the tip side). In other words, the shape of the support portion 3 is such that it extends radially outward and curves toward the lens portion 2 (inward). In the example of FIG. 1, the support portion 3 is gradually displaced in the counterclockwise direction in the circumferential direction of the lens portion 2 as the distance from the lens portion 2 increases.

The shape of the support portion 3 when viewed from the side may be, for example, a shape that fits within substantially the same plane as the lens portion 2 . Alternatively, when viewed from the side, the support portion 3 may be formed to extend obliquely from the outer peripheral edge of the lens portion 2 toward the front or back of the eye.

The base end 33 of the support part 3 is connected to the outer peripheral edge of the lens part 2, for example. The tip 31 of the support part 3 is a free end when it is not attached to the eyeball. The tip 31 is formed as a wide part that is wider than the other part 32. Note that there is no portion of the support portion 3 beyond the tip 31 (wide portion). The tip 31 and the other portion 32 are integrally formed of the same material. The other portion 32 is a portion between the distal end 31 and the proximal end 33 of the support portion 3, and more specifically, a portion immediately adjacent to the distal end 31. The proximal portion 32 of the tip is a portion that is passed from the inside through a needle hole formed in the sclera together with the tip 31 (wide portion) and is brought out to the outside of the sclera when the intraocular lens 1 is attached to the eyeball. This is the part that stays within the needle hole. Further, the portion 32 closest to the tip has a boundary portion 31d with the back surface 31c of the tip 31, as shown in FIG.

The tip 31 serving as the wide portion is formed in a shape that protrudes in a direction intersecting the central axis L1 of the support portion 3. Specifically, as shown in FIG. 2, when the tip 31 is divided into two regions with the axis L1 as a boundary in a cross section including the axis L1 of the support portion 3 in the plane, the tip 31 is located on the side of both regions. It is formed into a protruding shape. That is, the tip 31 has a portion 31a that protrudes toward one region (right side) from the axis L1 and a portion 31b that protrudes toward the other region (left side) when viewed in the cross section of FIG. These portions 31a and 31b protrude from the portion 32 closest to the tip in opposite directions.

More specifically, the tip 31 is formed in a shape that protrudes, for example, over the entire circumference around the axis L1 in a direction intersecting the axis L1 (the direction in which the support portion 3 extends). FIG. 3 is a plan view of the tip 31, in other words, a view of the tip 31 viewed from the direction of the axis L1. An intersection point P between the axis L1 of the support portion 3 and the tip 31 is set as the center of the tip. As shown in FIG. 3, the tip 31 protrudes radially outward from a portion 32 proximate to the tip over the entire circumference around the center P of the tip. Further, the tip 31 may be formed, for example, in a circular shape centered on the tip center P when viewed from the direction of FIG. Note that the tip 31 may be formed in a shape other than a circle, such as an ellipse or a polygon (square, rectangle, etc.) when viewed from the direction of FIG.

Further, as shown in FIG. 3, a reference line L0 passing through the tip center P and perpendicular to the axis L1 of the support part 3 is defined, and a direction R (radial direction) perpendicular to the axis L1 from the tip center P is defined as the reference line L0. Let it be expressed as an angle θ with respect to θ. The tip 31 is formed to protrude over the entire angle θ range of 0° to 360°. That is, the tip 31 protrudes both in the direction where the angle θ is 0° and in the direction where the angle θ is 180°. In addition, the tip 31 also protrudes in the direction of the angle θ of 90° and the direction of 270°.

As shown in FIG. 2, the width A of the tip 31 in the direction perpendicular to the axis L1 (the extending direction of the support portion 3) is larger than the width B of the portion 32 immediately adjacent to the tip in the direction perpendicular to the axis L1. Specifically, the width A is, for example, 0.2 mm to 0.6 mm. Within this range, the needle hole formed in the sclera can be made smaller when the distal end side of the support portion 3 is brought out of the eye from within the eye. Further, when the tip 31 is brought out from the inside of the eye to the outside of the eye using an instrument such as forceps (an instrument that controls the position of the support part 3), the tip 31 can be easily hooked onto the instrument. It is possible to prevent the support part 3 (tip 31) from coming off from the instrument while it is hooked on the instrument and taken out of the eye. If the width A is smaller than 0.2 mm, it will be difficult to hook the tip 31 onto a tool such as forceps. Moreover, if the width A is larger than 0.6 mm, the needle hole formed in the sclera in order to bring the tip 31 out of the eye from within the eye will become large.

The width B of the portion 32 closest to the tip is smaller than the width A of the tip 31. Specifically, the width B is smaller than 0.2 mm, for example.

Further, the amount of protrusion C (see FIG. 2) of the tip 31 from the portion 32 closest to the tip in the direction perpendicular to the axis L1 is set to, for example, 0.1 mm or more. If it is 0.1 mm or more, the tip 31 can easily be caught on a tool such as forceps. Furthermore, in FIG. 2, when the tip 31 is divided into two parts 31a and 31b with the axis L1 as a boundary, the protrusion amount C of one part 31a and the protrusion amount C of the other part 31b may be the same. However, they may be different. Furthermore, the amount of protrusion C may be the same over the entire circumference around the axis L1, or the amount of protrusion C may vary depending on the position around the axis L1.

Further, the width D (see FIG. 2) of the tip 31 (wide portion) in the direction of the axis L1 may be, for example, 2 mm or less. According to this, when the distal end 31 is hooked on an instrument such as forceps and brought out from the inside of the eye to the outside of the eye, the distal end 31 can be easily inserted into the needle hole formed in the sclera. Further, the width D may be, for example, 0.1 mm or more. According to this, when the tip 31 is hooked on a tool such as forceps, the tip 31 is prevented from deforming in a direction in which the angle φ (see FIG. 2), which will be described later, becomes larger, and the tip 31 comes off from the tool. can.

Further, as shown in FIG. 2, the tip 31 has a back surface 31c facing toward the portion 32 closest to the tip. The back surface 31c is a hook surface that is intended to be hooked on a tool such as forceps. The back surface 31c may be formed into a flat surface or a curved surface. As seen in the cross section of FIG. 2, the angle φ formed by the back surface 31c and the portion 32 closest to the tip is set to, for example, 15° or more and 160° or less. Within this range, tools such as forceps can be easily hooked onto the back surface 31c. If the angle φ is less than 15° or larger than 160°, it will be difficult for the instrument to catch on the back surface 31c. The angle φ is preferably set to 45° or more and 135° or less, and more preferably 60° or more and 120° or less. The example in FIG. 2 shows an example in which the angle φ is set to 90°. Note that the angle φ represents the tangent line indicating the inclination of the back surface 31 at the boundary 31d between the back surface 31c and the portion 32 closest to the tip, and the inclination of the portion 32 closest to the tip at the boundary 31d, when viewed in the cross section of FIG. It may be an angle formed with a tangent line.

Further, in FIG. 2, when the tip 31 is divided into two parts 31a and 31b with the axis L1 as a boundary, the angle φ of one part 31a and the angle φ of the other part 31b may be the same, or May be different. Furthermore, the angle φ may be the same over the entire circumference around the axis L1, or the angle φ may change depending on the position around the axis L1.

In addition, the shape of the tip 31 of one support part 3 and the shape of the tip 31 of the other support part 3 may be mutually the same shape. Although FIG. 2 shows a rectangular cross-sectional shape as an example of the cross-sectional shape of the tip 31, other cross-sectional shapes may be used, such as a polygonal shape other than a quadrilateral, a shape including a curved line, etc.

The support portion 3 is formed of a flexible material (in other words, elasticity or flexibility) so that it can be rolled into a rod shape and inserted into the eye using an injector or the like. The support part 3 is made of a material that melts (thermally deforms) when heated and forms a ball (thermally deformed part) that protrudes in a direction intersecting the extending direction (axis L1) of the support part 3. is formed. Specifically, the support portion 3 is made of a resin material such as PVDF (polyvinylidene fluoride). Moreover, the support part 3 may be formed of a different material from that of the lens part 2. In this case, the lens portion 2 and the support portion 3 may be formed separately and then joined using an adhesive or the like.

The support portion 3 and its tip 31 (wide portion) may be formed, for example, by molding. Alternatively, the tip 31 of the support portion 3 may be formed by heat treatment as described below. In this case, first, a pair of basic support parts 11 (see FIG. 4) that will become the basis of the support part 3 are prepared. At this time, a basic intraocular lens 10 (see FIG. 4) in which each base end of a pair of basic support parts 11 is connected to the lens part 2 may be prepared, or a basic support part 11 separated from the lens part 2 may be prepared. may be prepared. When preparing the basic support part 11 separated from the lens part 2, after forming a thermally deformed part 13 (see FIG. 5) at the tip of the support part 11 by heat treatment described later, the lens part 2 and the support part 11 are separated. (corresponding to the support part 3 in FIG. 1).

The tip 12 of the basic support part 11 is formed to have the same width as the other parts, in other words, the tip 12 does not have a wide shape or a protruding shape. The basic support part 11 has the same shape as the support part 3 of FIG. 1 except for the tip 12, that is, it has a shape extending in a curved shape (specifically, an arc shape or a haptic shape).

The basic support part 11 is made of a material that melts (is thermally deformed) when heated to form a thermally deformed part that protrudes in a direction intersecting the direction in which the basic support part 11 extends. Specifically, for example, the basic support portion 11 is formed of a resin material such as PVDF (polyvinylidene fluoride).

Next, before inserting the basic intraocular lens 10 or the basic support part 11 into the eye, the tip 12 of each basic support part 11 is melted by heating using a heating device (such as a medical cauterization device (Accutem)). (Heat deforms). As the basic support part 11 melts, it gradually shrinks while forming a thermally deformed part 13 (see FIG. 5) that protrudes in a direction intersecting the extending direction of the support part 11 at its tip. Further, as the shrinkage progresses, the thermally deformed portion 13 gradually becomes larger. Then, when the thermally deformable portion 13 reaches the target size or shape, the heating is finished. In FIG. 5, the thermally deformed portion 13 at the end of heating corresponds to the tip 31 (wide portion) in FIG. The support portion 11 at the end of heating corresponds to the support portion 3 in FIG. 1 . The intraocular lens 10 after heating corresponds to the intraocular lens 1 in FIG. 1 . Through the above steps, it is possible to obtain the intraocular lens support portion 3 having the wide-shaped distal end 31.

The intraocular lens 1 shown in Fig. 1 is fixed by intrascleral fixation (without sutures) in the posterior chamber of the eye after the entire or partial removal of the crystalline lens, which has become cloudy due to cataract, for example. be done. An example of a procedure for mounting (fixing) the intraocular lens 1 in the eye will be described below with reference to FIGS. 6 to 10. As a premise for wearing the intraocular lens 1, it is assumed that the crystalline lens has been completely or partially removed. First, for example, an incision is formed in the limbus (in other words, the edge or outer periphery) of the cornea 100 (see FIG. 6), and the intraocular lens 1 is inserted through the incision into a syringe shape with the intraocular lens 1 rolled into a rod shape. It is inserted into the eye using an injector (intraocular lens inserter). At this time, the intraocular lens 1 is inserted into a region behind the iris 102 (see FIG. 6) (that is, the posterior chamber).

Next, the distal end side of the support portion 3 of the intraocular lens 1 is pulled out to the outside of the sclera 101 (see FIG. 6). Specifically, as shown in FIG. 6, a hole (tunnel) 101a is formed in the sclera 101 with a needle so that the posterior chamber into which the intraocular lens 1 is inserted is electrically connected to the outside of the eyeball. The position where the needle hole 101a is formed is a position behind the iris 102, and specifically, for example, may be a position in the ciliary groove 104 in front of the ciliary body fold 103. In addition, a hole 101a for each support portion 3 is formed. At this time, holes 101a are formed at two locations on the sclera 101 that are symmetrical with respect to the visual axis.

Then, the distal end side of one support part 3 is pulled out from one hole 101a (hereinafter referred to as the first needle hole), and the distal end side of the other support part 3 is pulled out through the other hole 101a (hereinafter referred to as the second needle hole). pull it out from the hole (called a hole). Specifically, a rod-shaped instrument 200 for bringing the distal end of the support part 3 out of the eye from inside the eye is inserted into the posterior chamber from the first needle hole 101a. The instrument 200 is, for example, a hooked forceps having a hook at its tip, and has a hook portion 202 (see FIG. 7) at its tip, on which the tip 31 of the support portion 3 can be hooked. When the instrument 200 is a forceps, the distal end of the instrument 200 has a gripping part 201 (see FIG. 7) that pinches and grips the distal end 31. Then, the distal end side of one of the support parts 3 is grasped with the instrument 200. At this time, as shown in FIG. 7, the back surface 31c of the tip 31 (wide portion) of the support section 3 is hooked onto the hook 202 at the tip of the instrument 200. Thereafter, the instrument 200 is pulled out of the eye through the first needle hole 101a. Accordingly, a portion of the support portion 3 from the distal end 31 is pulled out of the eye from the first needle hole 101a.

Similarly, the instrument 200 is inserted into the posterior chamber through the second needle hole 101a, and a portion of the distal end 31 of the other support portion 3 is pulled out of the eye from the second needle hole 101a using the instrument 200. FIG. 8 shows a state in which the distal ends of both support parts 3 are pulled out to the outside of the sclera 101. In this state, the lens portion 2 remains in the posterior chamber.

Thereafter, the distal end 31 (wide part) of the support part 3 that is exposed outside the eye is cut with scissors. Thereafter, using a heating instrument (such as a medical cautery instrument (Accutemp)), the tip of the support section 3 after cutting the wide section 31 is melted (thermally deformed) by heating. As the support part 3 melts, it gradually shrinks while forming a thermally deformed part 34 (see FIG. 9) protruding in a direction intersecting the extending direction of the support part 11 at its tip. Further, as the shrinkage progresses, the thermally deformed portion 34 gradually becomes larger. Then, when the thermally deformable portion 34 reaches the target size or shape, the heating is finished. The size of the thermally deformed portion 34 may be larger than the original tip 31 (wide portion), for example. According to this, when the thermally deformable part 34 is embedded and supported in the sclera 101, it is possible to suppress the thermally deformable part 34 from coming off from the sclera 101.

Furthermore, until the thermally deformed portion 34 is formed at the tip of one support portion 3, the original tip 31 of the other support portion 3 may not be cut and heat treated. According to this, the tip 31 (wide part) of the other support part 3 serves as a stopper, so that while the thermally deformed part 34 is being formed in one support part 3, the tip of the other support part 3 This can prevent the side from being pulled back into the eye. After forming the thermal deformation part 34 at the tip of one support part 3, the tip 31 of the other support part 3 is cut with scissors, and the cut tip is thermally deformed by heating. A thermally deformable portion 34 is also formed at the tip of the portion 3.

Thereafter, as shown in FIG. 10, the thermally deformed portion 34 at the tip of each support portion 3 is embedded into the sclera 101 by being pushed into the needle hole 101a. Thereby, the support portion 3 is fixed (supported) by the sclera 101.

As described above, the intraocular lens 1 is installed in the eye. In this state, the lens section 2 is placed behind the iris 102.

The effects of this embodiment will be explained below. In this embodiment, since the distal end 31 of the support part 3 is configured as a wide part, when the distal end 31 is brought out from the inside of the eye to the outside of the eye, the distal end 31 is attached to an instrument 200 (see FIGS. 6 and 7) such as forceps. can be hooked. Thereby, a part of the support part 3 from the distal end 31 can be easily taken out of the eye. Further, it is possible to prevent the tip 31 from being pulled back into the eye after being pulled out of the eye.

Further, the tip 31 has a portion 31a that protrudes toward one region (right side) and a portion 31b that protrudes toward the other region (left side) from the axis L1 when viewed in cross section in FIG. The tip 31 can be gripped with the instrument 200. This can prevent the distal end 31 from coming off the instrument 200 while the distal end 31 is being pulled out of the eye.

Furthermore, since the tip 31 is formed in a shape that protrudes in the direction intersecting the axis L1 over the entire circumference around the axis L1 of the support part 3, the hooking part 202 (see FIG. 7) at the tip of the instrument 200 can be attached to the instrument 200. The tip 31 of the support portion 3 can be hooked onto the hook portion 202 in any direction around the axis of the support portion 200 .

Further, the width of the tip 31 in the direction perpendicular to the extending direction of the support portion 3 (direction of the axis L1) is 0.2. mm to 0.6 mm, the diameter of the needle hole 101a (see FIG. 6) formed in the sclera 101 can be reduced, and the tip 31 can be removed from the device 200 while being pulled out of the eye with the device 200. You can prevent it from coming off.

Moreover, since the angle φ formed by the back surface 31c of the tip 31 (projection) and the portion 32 closest to the tip is 15° or more and 160° or less when viewed in the cross section of FIG. 2, the back surface 31c can be easily hooked onto the instrument 200. .

Furthermore, since the support part 3 is made of a material that forms a thermally deformed part that protrudes in a direction crossing the extending direction of the support part 3 when heated, after cutting the distal end 31 that has been pulled out of the eye, A thermally deformable portion 34 (see FIGS. 9 and 10) for fixing to the sclera 101 can be formed, which is different in size and position on the support portion 3 from the tip 31.

Note that the present disclosure is not limited to the above embodiments, and various changes are possible. For example, FIG. 3 shows an example in which the tip 31 of the support portion 3 protrudes radially outward from the portion 32 closest to the tip over the entire circumference around the tip center P. However, the present invention is not limited thereto, and instead of the tip 31 in FIG. 3, tips 35 and 36 shown in FIG. 11 or 12 may be used, for example. 11 and 12 are plan views of the tips 35 and 36 of the support part 3 according to a modified example, and are views of the tips 35 and 36 viewed from the direction of the axis of the support part 3.

The tips 35 and 36 in FIGS. 11 and 12 have a plurality of protrusions 35a, 35b, 36a to 36d spaced apart in the circumferential direction around the tip center P. Specifically, the tip 35 in FIG. 11 has two protrusions 35a and 35b spaced equally apart (in other words, 180° apart) in the circumferential direction around the center P of the tip. These two protrusions 35a and 35b protrude radially outward from the portion 32 closest to the tip when viewed from the direction of FIG. 11 and in mutually opposite directions. In other words, the tip 35 composed of the two protrusions 35a and 35b is aligned with the axis in a cross section including the axis of the support portion 3 in the plane (a cross section where the tip 35 is cut along the broken line L2 in FIG. 11, not shown). It is formed in a shape that protrudes to the side of both regions when it is divided into two regions at the border.

Since the distal end 35 has two protrusions 35a and 35b in opposite directions, as in the above embodiment, the distal end 35 is pulled out of the eye while hooking the two protrusions 35a and 35b with an instrument such as forceps. I can put it out.

Further, the tip 36 in FIG. 12 has four protrusions 36a to 36d at equal intervals (in other words, at 90° intervals) in the circumferential direction around the center P of the tip. The first protruding portion 36a and the second protruding portion 36b protrude outward in the radial direction from the portion 32 closest to the tip when viewed from the direction of FIG. 12 and in mutually opposite directions. The first and second protrusions 36a and 36b are divided into two areas with the axis as a boundary in a cross section including the axis of the support part 3 in the plane (a cross section where the tip 36 is cut along the broken line L3 in FIG. 12, not shown). It is formed in a shape that protrudes on both sides when divided into two areas.

The third protruding portion 36c and the fourth protruding portion 36d protrude outward in the radial direction from the portion 32 closest to the tip when viewed from the direction of FIG. 12 and in mutually opposite directions. The third and fourth protrusions 36c and 36d are divided into two areas with the axis as a boundary in a cross section including the axis of the support part 3 in the plane (a cross section where the tip 36 is cut along the broken line L4 in FIG. 12, not shown). It is formed in a shape that protrudes on both sides when divided into two areas.

Since the distal end 36 is formed in a shape that protrudes in four different directions, similarly to the above embodiment, the distal end 36 is pulled out of the eye while hooking any one of the four protruding parts 36a to 36d with an instrument such as forceps. It can be sent to In particular, the tip 36 has two combinations of protrusions that protrude in opposite directions: a first combination consisting of first and second protrusions 36a and 36b, and a third combination consisting of third and fourth protrusions 36c and 36d. Since it has a combination of 2, it can be hooked even more easily with tools such as forceps. That is, the first combination can be hooked on the appliance, and the second combination can be hooked on the appliance.

Further, in the above embodiment, an example was shown in which the distal end 31 side of the support portion 3 was pulled out of the eye and then the distal end 31 was cut. However, the present invention is not limited to this, and the tip 31 (wide portion) that has been pulled out of the eye may be fixed to a portion of the eyeball (inside the sclera, etc.) without cutting the tip 31 (wide portion). That is, the distal end 31 (wide portion) may be configured as a portion that serves both as a portion to be hooked to an instrument such as forceps and a portion to be supported (fixed) on the eyeball.

Further, in the above embodiment, an example is shown in which the number of support parts is two, but the number of support parts may be three or more. The present disclosure may also be applied to phakic intraocular lenses (ICLs, intraocular contact lenses).

Moreover, like the intraocular lens 20 of FIG. 13, the tip 37 of the support part 3 may be bead-shaped (in other words, spherical). Note that in FIG. 13, the same components as those of the intraocular lens 1 in FIG. 1 are denoted by the same reference numerals. The entire tip 37 is formed into a curved shape. Further, the tip 37 may be formed into a true spherical shape, or may be formed into a spherical shape whose diameter changes depending on the direction (for example, an elliptical spherical shape in which the diameter in the direction perpendicular to the axis L1 is different from the diameter in the direction of the axis L1). Good too.

The ball-shaped tip 37 is formed to be wider than the other portion 32 of the support portion 3 in the direction intersecting the axis L1. In other words, the tip 37 is also configured as a wide portion. Similar to the tip 31 in FIGS. 1 to 3, the ball-shaped tip 37 is divided into two regions with the axis L1 as a border in a cross section (see FIG. 14) that includes the axis L1 of the support portion 3 in the plane. It is formed in a shape that protrudes from both sides. Moreover, the tip 37 is formed in a shape that protrudes in a direction intersecting the extending direction of the support part 3 over the entire circumference of the support part 3 around the axis L1. Further, the diameter of the bead-shaped tip 37 (in other words, the width of the tip 37 in the direction perpendicular to the axis L1) may be, for example, 0.2 mm to 0.6 mm, similar to the width A of the tip 31 in FIG. . Further, the width of the tip 37 in the direction of the axis L1 may be different from the width of the tip 37 in the direction perpendicular to the axis L1, for example, 0.1 mm like the width D of the tip 31 in FIG. It may be greater than or equal to 2 mm. Further, when viewed in the cross section of FIG. 14, the angle α (see FIG. 14) formed between the back surface 37a of the tip 37 (the surface near the boundary 37b with the other portion 32) and the other portion 32 is, for example, 15° or more. It is 160° or less. The angle α may be an angle formed by an inclination (tangential line) L5 of the tip 37 (back surface 37a) at the boundary portion 37b and an inclination (tangent line) L6 of the other portion 32 at the boundary portion 37b.

The tip 37 may be formed in the same manner as in FIGS. 4 and 5, for example. That is, a basic support part in which a ball as a wide part is not formed at the tip is prepared, and the tip of the basic support part is melted (thermally deformed) by heating to form the bead-shaped tip 37. The configurations shown in FIGS. 13 and 14 also provide the same effects as those of the above embodiment.

Moreover, in the embodiment described above, an example was shown in which the support part 3 of the intraocular lens 1 or 20 of FIG. 1 or 13 is fixed within the sclera. However, the present invention is not limited thereto, and the intraocular lenses 1 and 20 may be fixed within the capsule of the crystalline lens after, for example, the nucleus of the crystalline lens that has become cloudy due to a cataract is extracted. In this case, the support portion 3 is supported by the lens capsule along its loop shape so as to be in contact with the inner surface of the lens capsule. In this case, when the intraocular lenses 1 and 20 are installed in the capsule of the crystalline lens, the wide parts 31, 35, 36 at the tip of the support part 3, 37 (see FIGS. 1, 11, 12, and 13), the positions of the intraocular lenses 1 and 20 (lens part 2 and support part 3) within the capsule may be adjusted.

In this way, the intraocular lenses 1 and 20 shown in FIGS. 1 and 13 are configured as intraocular lenses that can be used for both intra-scleral fixation and intra-lens capsule fixation. The wide parts 31, 35, 36, and 37 (see Figures 1, 11, 12, and 13) are parts that are hooked onto instruments such as forceps when fixing the distal end of the support part 3 within the sclera. When the support part 3 is fixed within the lens capsule, it does not necessarily need to be hooked on a device such as forceps.

1, 20 Intraocular lens 2 Lens part 3 Support part 31, 35, 36, 37 Tip of support part (wide part)
13 Heat deformation part

Claims (8)

a lens section;
a support part extending linearly from the lens part and supported by the eyeball part,
The tip of the support part is a wide part that is wider than other parts,
The wide part is a part on which the distal end side of the support part is hooked to an instrument that takes it out of the eye from inside the eye.
Intraocular lens. 2. The wide portion is formed in a shape that protrudes to the sides of both regions when the wide portion is divided into two regions with the axis as a boundary in a cross section including the axis of the support portion in a plane. intraocular lens. The intraocular lens according to claim 1 or 2, wherein the wide portion is formed in a shape that protrudes in a direction intersecting an extending direction of the support portion over the entire circumference around the axis of the support portion. The intraocular lens according to claim 1, wherein the width of the wide portion in a direction perpendicular to the extending direction of the support portion is 0.2 mm to 0.6 mm. The intraocular lens according to claim 1, wherein the support part is formed of a material that forms a thermally deformable part that protrudes in a direction crossing the direction in which the support part extends when heated. The eye according to claim 1, wherein an angle between the back surface of the wide portion and the other portion of the support portion is 15° or more and 160° or less when viewed in a cross section that includes the axis of the support portion in the plane. inner lens. The intraocular lens according to claim 1, wherein the wide portion is bead-shaped. A linearly extending support part is prepared, one end of which is connected to the lens part to be inserted into the eye, and the other end is supported by the part of the eyeball, and the support part is used before being inserted into the eye. heating the tip of the supporting portion to form a thermally deformable portion protruding in a direction intersecting the extending direction of the supporting portion;
A method for manufacturing an intraocular lens support.

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