JPH07222760A - Intraocular lens - Google Patents

Abstract

PURPOSE:To provide an intraocular lens which is adjustable in focus by the effect of the ciliary muscles in the eye. CONSTITUTION:This intraocular lens has a lens part 1 and a supporting member 2 for intraocularly holding this lens part 1 and is arranged in a position where this supporting member 2 comes into direct or indirect contact with the intraocular ciliary muscles. The loop part 21 constituting the supporting member 2 moves the lens part 1 in its optical axis direction when external force is applied thereon from the part A of the loop part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intraocular lens which is implanted in the eye instead of the crystalline lens whose function is impaired due to cataract or the like.

[0002]

2. Description of the Related Art An intraocular lens to be implanted in the eye instead of a crystalline lens whose function has been impaired due to cataract or the like is usually a substantially circular lens part and is attached to this lens part so that the lens part is placed in the eye. It is composed of a supporting member to support,
A variety of different support members have been developed.

For example, as a supporting member, a plurality of thin arm-shaped members are attached to the outer peripheral portion of the lens portion, and the arm-shaped members are curved in such a manner as to surround a part of the circular outer periphery of the lens portion in the order. There are known ones, such as a so-called disc type in which a loop-shaped body surrounding the outer periphery of the lens portion is attached to the lens portion by an arm-shaped body.

Further, the one in which the lens portion and the supporting member are integrally made of the same material is called a so-called one-piece type,
Those made of different materials are called a two-piece type or a three-piece type (for example, JP-A-57-170).
250, U.S. Pat. No. 4,370,760, U.S. Pat. No. 4,435,855, Patent Application Publication No. Hei 3-503253, European Patent Publication No. 028.
No. 9449 (1988), International Publication No. 91/15166
Pamphlet (1991), Japanese Patent Application No. 5-14205, Japanese Patent Application No. 5-20299, etc.). In addition, as the lens unit, if necessary, single focus, multi focus,
A spherical configuration, an aspherical configuration, etc. are adopted.

[0005]

By the way, the refractive power and / or the position of the crystalline lens of a normal eye can be changed by tensioning or relaxing the ciliary muscle. , You can focus on various objects at different distances from your eyes.

However, the conventional intraocular lens is firmly fixed at a predetermined position in the eye, and the position of the lens is fixed so that the distance from the eye is focused only on a specific object. ing. Therefore, it has been considered that the conventional intraocular lens cannot obtain the focus adjusting action like the crystalline lens of a normal eye.

The present invention has been made to solve the above problems, and an object thereof is to provide an intraocular lens capable of adjusting the focus by the action of the ciliary muscle in the eye.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] An intraocular lens according to the present invention for solving the above-mentioned problems comprises (Constitution 1) a lens portion and a support member for holding the lens portion in the eye. An intraocular lens disposed at a position where the support member directly or indirectly contacts the ciliary muscle in the eye, wherein the support member has the lens portion when an external force is applied to the support member. Is configured to be coupled to the lens portion with a structure for exerting a force to move the lens in the optical axis direction. As an aspect of this configuration 1, (configuration 2) In the intraocular lens of configuration 1, , The support member is
When the support member is arranged at a position in direct or indirect contact with the ciliary muscle in the eye, the lens portion is moved to the cornea side when there is a tension action of the ciliary muscle, When the skeletal muscle has a relaxing action, the structure is such that the lens part is coupled to the lens part with a structure that exerts a force to move the lens part to the retina side. As an aspect, (Structure 3) In the intraocular lens according to Structure 1 or 2, the support member has a loop portion having a diameter larger than an outer diameter of the lens portion, and a support arm portion for fixing the loop portion to the lens portion. And the lens portion is disposed on a surface having a distance from the surface including the loop portion, and as an aspect of the configuration 3, (configuration 4) In the intraocular lens, the loop portion The configuration is characterized in that the loop portion is formed so that the surface including the surface is a surface that is convex in the direction of the optical axis of the lens portion and opposite to the side where the lens portion is arranged. Further, as an aspect of any one of the configurations 3 and 4, (configuration 5), in the intraocular lens of the configurations 3 or 4, the loop portion has a substantially oval shape. It is a thing.

[0009]

According to the above-mentioned structure 1, the supporting member for holding the lens portion in the eye is arranged at a position in direct or indirect contact with the ciliary muscle in the eye, and the supporting member is When an external force is applied, the lens portion is coupled to the lens portion with a structure that exerts a force that moves the lens portion in the optical axis direction. Move along the optical axis. This makes it possible to obtain a regulatory action similar to the function of the lens of a normal eye.

Further, according to the configuration 2, the support member has a tension effect on the ciliary muscle when the support member is arranged at a position where it directly or indirectly contacts the ciliary muscle in the eye. When the lens portion is moved to the cornea side, and when there is a relaxing action of the ciliary muscle, it is coupled to the lens portion with a structure that exerts a force to move the lens portion to the retina side. Since the configuration is characterized by the above, it is possible to obtain a regulatory action closer to the function of the crystalline lens of the normal eye without a sense of discomfort.

According to the structure 3, since the lens portion of the intraocular lens is arranged on the surface having a distance from the surface including the loop portion, the loop portion is pushed by applying the ciliary muscle. When contracted or expanded, the lens portion moves in the optical axis direction, and an adjusting effect can be obtained.

According to the configuration 4, the loop portion is formed so that the surface including the loop portion is a surface which is convex in the optical axis direction of the lens portion and in the direction opposite to the side where the lens portion is arranged. By forming it, when inserting the intraocular lens into the lens capsule from which the lens has been removed, the lens part can be housed so as to be in contact with the posterior capsule, thereby reducing the possibility of injury after transplantation. It becomes possible.

According to the configuration 5, the loop portion is formed into a substantially oval shape, so that the action of the ciliary muscle can be effectively transmitted to the support member.

[0014]

First Embodiment FIG. 1 is a perspective view of an intraocular lens according to the first embodiment of the present invention, FIG. 2 is a plan view of the intraocular lens according to the first embodiment, and FIG. 3 is a first embodiment. It is a side view of the intraocular lens concerning. The first embodiment will be described below with reference to these drawings. This embodiment is an example in which the present invention is applied to a so-called disc type intraocular lens.

In FIG. 1, reference numeral 1 is a lens portion, and reference numeral 2
Is a support member. This disc-type intraocular lens includes a loop portion 21 formed around the lens portion 1 along an oval curve surrounding the lens portion 1, and the lens portion 1 for fixing the loop portion 21 to the lens portion 1. The support member 2 is formed of two support arm portions 22 in which the outer peripheral portion of 1 and the loop portion 21 are joined. It should be noted that two support arm portions 22 having the same shape are symmetrically provided with the center of the lens portion 1 as the center of symmetry.

Further, as apparent from FIGS. 1 and 3,
The lens portion 1 is arranged on a surface having a distance from the surface including the loop portion 21, and the surface including the loop portion 21 is
The loop portion 21 is formed so as to have a curved surface that is convex in the optical axis direction of the lens portion 1 and in the direction opposite to the side where the lens portion 1 is arranged.

The lens portion 1 and the supporting member 2 are both made of polymethylmethacrylate (PMMA). Here, the lens portion 1 is a convex lens having a substantially circular shape in a plan view, and the diameter of the lens is about 5 mm. The lens unit 1 is not limited to a convex lens, and a concave lens, a plano-convex lens, a plano-concave lens, a meniscus lens, an aspherical lens, a bifocal lens, or the like can be used as necessary.

The loop portion 21 has a major axis Dl of about 13 mm and a minor axis Ds of about 8.9 m centered on the center O of the lens section 1.
In addition, as shown in FIG. 3, the protrusion amount d1 in the direction opposite to the side where the lens portion 1 is arranged is about 0.5 mm, and the lens portion 1 and the loop are Part 21
The distance d2 to the surface including is 1.2 mm, and the length d of the supporting arm is
3 is about 1.0 mm, and the angle α formed by the support arm portion 22 with respect to the plane orthogonal to the optical axis of the lens portion 1 is about 38.11 °.

The intraocular lens having the above-mentioned structure is grasped by a grasping tool such as tweezers or a dedicated tool, and is inserted into the eye through an incision formed by incising a part of the cornea of the eyeball to remove the crystalline lens. It is inserted and fixed in the lenticule. FIG. 4 is a view showing a state in which the intraocular lens is inserted into the lens capsule, and as shown in the figure, the loop portion 21
Is disposed on the cornea 6 side, and the rear surface of the lens portion 1 is arranged so as to contact the inner surface (rear sac) of the lens capsule 3 on the retina side. Further, the outer peripheral portion of the loop portion 1, particularly, the outer peripheral portion in the major axis direction (A portion in the figure) is in contact with the ciliary muscle 4 indirectly through the lens capsule 3, and The tension or relaxation action of No. 4 is transmitted to the loop portion 21. Further, by inserting and arranging in this manner, as will be described later, it is possible to obtain a more natural regulatory action and at the same time reduce the risk of the occurrence of aftereffects.

In the intraocular lens 10 of this embodiment, as shown in FIGS. 1 to 3, when a pressing force is applied to the portion A (both sides in the major axis direction of the ellipse) to compress the loop portion 21,
The lens 1 moves in the p direction (the optical axis direction of the lens unit 1) in the figure corresponding to the contraction of the loop unit 1. The results of actually measuring the amount of movement of the lens unit 1 with respect to the amount of contraction of the loop unit 21 are as follows.

Shrinkage amount of the loop portion 21 (mm) Movement amount of the lens portion 1 (mm) 0.05 0.07 0.10 0.19 0.15 0.36 0.20 0.56 0.25 0. 76 0.30 0.96 0.35 1.13 FIG. 5 is a graph showing the result of actually measuring the amount of movement of the lens unit 1 with respect to the amount of contraction of the loop unit 21. Figure 5
The horizontal axis represents the amount of contraction of the loop portion 21 (unit mm), and the vertical axis represents the amount of movement of the lens unit 1 (unit mm). As is clear from FIG. 5, the amount of movement of the lens unit 1 and the amount of contraction of the loop unit 1 are in a substantially linear relationship.

Next, consider a case where the intraocular lens 10 of this embodiment is implanted in the lens capsule 3. Then, when the ciliary muscle 4 is tense, the loop portion 21 is compressed and the lens portion 1 moves to the cornea 6 side (p side), and when it relaxes, the lens portion 1 moves to the retina (not shown) side, As a result, the distance (near point distance) to the object in focus changes. Now, as for the lens unit 1, a lens having a refractive power of +20 diopter in the eye, which is in focus at a distance when the amount of movement of the lens unit 1 in the eye is 0, is used. The following is the result of calculating the near point distance with respect to the movement amount of the lens unit 1 using the model eye.

Movement amount of lens part 1 (mm) Total refractive power Near point distance (movement amount to cornea side) 0.0 +58.64 Infinity 1.0 +59.27 90 cm 1.5 +59.57 60 cm The above result Therefore, in the intraocular lens 10 of this embodiment, the lens portion 1 moves to the side of the cornea of 1.5 mm due to the tension action of the ciliary muscle in the eye, thereby focusing from infinity to about 60 cm in front of the eye. It turns out that it is possible. Moreover, in this case, the tension action of the ciliary muscles is performed even when looking close even in the case of a normal eye. Therefore, the adjustment action of the intraocular lens of this example is similar to that of the normal eye. You can get a matched natural adjustment feeling.

Second Embodiment FIG. 6 is a perspective view of an intraocular lens according to the second embodiment, FIG. 7 is a plan view of the intraocular lens according to the second embodiment, and FIG. 8 is an intraocular lens according to the second embodiment. It is a side view of a lens. The second embodiment will be described below with reference to these drawings. In addition,
This embodiment has the same basic configuration as that of the above-described first embodiment except that the surface including the loop portion is substantially flat. Therefore, corresponding parts are designated by the same reference numerals and their description is omitted. .

The loop portion 21 in this embodiment is an elliptical shape having a major axis Dl of about 13 mm and a minor axis Ds of about 10.9 mm centered on the center O of the lens section 1.
Further, the distance d2 between the lens portion 1 and the surface including the loop portion 21
Is 0.87 mm, the length d3 of the supporting arm is about 2.2 mm,
An angle α formed by the support arm portion 22 with respect to a plane orthogonal to the optical axis of the lens portion 1 is about 14 °.

In the intraocular lens of this embodiment, as shown in FIGS. 6 to 8, when a pressing force is applied to the B portion (both sides in the major axis direction of the ellipse) to compress the loop portion 21, the lens The portion 1 moves in the p direction (the optical axis direction of the lens portion 1) in the figure corresponding to the contraction of the loop portion 1. It has been confirmed that the same effects as those of the first embodiment can be obtained by this embodiment as well.

Third Embodiment FIG. 9 is a plan view of an intraocular lens according to a third embodiment, FIG.
[Fig. 8] is a side view of the intraocular lens according to the third example. This embodiment is an example in which the present invention is applied to an intraocular lens of a type in which the lens portion is supported in the eye by two supporting arm portions, unlike each of the above-described embodiments.

As shown in FIGS. 9 and 10, two supporting arm portions 20 extending outward from two symmetrical starting points of the outer edge portion of the lens portion 1 surround the lens portion 1. Is formed along the outer periphery of the lens portion 1 up to the side opposite to the side having the starting point. In this case, only the vicinity of the starting point of the support arm portion 20 rises with an angle with respect to the surface including the lens portion 1, and the other portions are substantially parallel to the surface including the lens portion 1. Is formed. In this case, the maximum diameter portion Dl of the support arm portion 20 is about 1
3 mm, the minimum diameter portion Ds is about 9.54 mm, and
The distance d2 between the lens portion 1 and the surface including the supporting arm portion 20 is 0.
87 mm, the total length of the supporting arm portion 20 is d3 of about 26.4 m.
m, the angle α formed by the starting portion of the supporting arm portion 20 with respect to the plane orthogonal to the optical axis of the lens portion 1 is about 18.21 °.

The intraocular lens of this embodiment is shown in FIGS.
As indicated by 0, when a pressing force is applied to the D portion and this portion is pressed and contracted, the lens portion 1 correspondingly moves in the p direction (optical axis direction of the lens portion 1) in the drawing. It has been confirmed that substantially the same effects as those of the above-mentioned respective embodiments can be obtained also by this embodiment. In addition, this embodiment has an advantage that it can be inserted more easily than the disc type when it is inserted into the eye.

The material for forming the lens portion 1 and the supporting member 2 may be any material that can be used as a lens material and at the same time has appropriate elasticity.
In addition to A, for example, hydroxyethyl methacrylate, silicone, polysulfone, fluorine-based polymer, polycarbonate and the like can be used.

[0031]

As described in detail above, the intraocular lens of the present invention comprises a lens portion and a support member for holding the lens portion in the eye, and the support member is a ciliary muscle in the eye. Is an intraocular lens disposed at a position that directly or indirectly contacts the support member, the support member, when an external force is applied to the support member,
By having a structure characterized in that it is coupled to the lens part with a structure that exerts a force that moves the lens part in the optical axis direction, when implanted in the eye, the lens part is moved by the action of the ciliary muscle. An intraocular lens that moves in the optical axis direction and obtains an adjusting action similar to the function of the crystalline lens of a normal eye, that is, an adjusting action of the focal length of the entire eye is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an intraocular lens according to a first embodiment of the present invention.

FIG. 2 is a plan view of the intraocular lens according to the first example.

FIG. 3 is a side view of the intraocular lens according to the first example.

FIG. 4 is a cross-sectional view showing a state in which the intraocular lens according to the first example is inserted into the eye.

FIG. 5 is a graph showing the relationship between the amount of contraction of the loop of the intraocular lens and the movement distance of the lens unit according to the first example.

FIG. 6 is a perspective view of an intraocular lens according to a second example.

FIG. 7 is a plan view of an intraocular lens according to a second example.

FIG. 8 is a side view of the intraocular lens according to the second example.

FIG. 9 is a plan view of an intraocular lens according to a third example.

FIG. 10 is a side view of the intraocular lens according to the third example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lens part, 2 ... Support member, 3 ... Lens capsule, 4 ... Ciliary muscle, 20 ... Support arm member, 21 ... Loop part, 22 ... Support arm part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Norio Hirayama 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo Hoya Co., Ltd.

Claims (5)

[Claims] 1. An eye comprising a lens portion and a support member for holding the lens portion in the eye, wherein the support member is arranged at a position where it directly or indirectly contacts a ciliary muscle in the eye. An inner lens, wherein the support member is configured such that when an external force is applied to the support member,
An intraocular lens characterized in that the intraocular lens is connected to the lens portion with a structure that exerts a force to move the lens portion in the optical axis direction. 2. The intraocular lens according to claim 1, wherein the support member is arranged in a position where the support member directly or indirectly contacts a ciliary muscle in the eye. The lens unit has a structure in which a force acts to move the lens unit to the cornea side when there is a muscle tension action and to move the lens unit to the retina side when there is a relaxation action to the ciliary muscle. An intraocular lens characterized by being bonded to. 3. The intraocular lens according to claim 1, wherein the support member has a loop portion having a diameter larger than an outer diameter of the lens portion, and a support arm that fixes the loop portion to the lens portion. An intraocular lens, wherein the intraocular lens is disposed on a surface having a distance from a surface including the loop portion. 4. The intraocular lens according to claim 3, wherein a surface including the loop portion is convex in a direction of an optical axis of the lens portion and a side opposite to a side where the lens portion is arranged. An intraocular lens, wherein the loop portion is formed so as to have a certain surface. 5. The intraocular lens according to claim 3, wherein the loop portion has a substantially oval shape.