JPH01300948A - Intraocular lens - Google Patents

Abstract

PURPOSE:To enhance intraocular retentivity and to provide bio-compatibility, by constituting a support part or both of an optical part and the support part of a core material and an outer layer material. CONSTITUTION:For example, an optical part 1 is formed from silicone rubber and, for example, a core material 4 composed of a plastic material such as polypropylene is embedded in a support 2 having an outer layer material 3 made of the same silicone rubber. This intraocular lens is formed, for example, by a method wherein a wire material composed of a plastic material, for example, polypropylene is used as the core material to be inserted in a mold at a predetermined place and silicone rubber becoming the outer layer material 3 is subsequently poured in the mold to form the optical part 1 and, at the same time, all of the elements are unified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intraocular lens that is inserted after removing the crystalline lens during cataract surgery or the like and is used for refractive correction of the eye.

[Prior art] In recent years, an intraocular lens is often inserted in place of the legitimate lens after cataract surgery.This surgery consists of crushing the crystalline lens tissue using ultrasound, suction, and inserting the intraocular lens. It will be done. It is safer to keep the incision and suture of the ocular tissues as small as possible when removing the crystalline lens and inserting the intraocular lens, and the results after surgery are also better. Therefore, as an intraocular lens to be inserted, an intraocular lens made of a foldable and flexible material, such as silicone rubber, has been proposed in place of the conventional plastic lens such as acrylic.

In addition, unlike plastic materials such as acrylic, silicone rubber can be sterilized in an autoclave, so there is no problem with residual ethylene oxide gas, which is harmful to the human body, and it is also effective against iris, lens capsule, and residual substances in the lens. Recently, its superiority has been attracting attention because it does not cause adhesions.

[Problems to be Solved by the Invention] However, the material strength of silicone rubber itself is only about 1/10 that of plastic materials such as acrylic and polypropylene, so the shape of the support part as shown in FIG. Intraocular lenses that are integrated with silicone rubber, that is, both the optical part l and the support gB2 are made of silicone rubber, have been proposed in the past. Compared to an intraocular lens in which the portion 1 is made of acrylic and the strip-shaped support 12 is made of a plastic material such as polypropylene,
Since the support part 2 has little springiness, it has poor intraocular retention, and there are problems in that it may pop out of the eyeball or become misaligned after surgery.

To solve this problem, an intraocular lens can be considered, for example, consisting of an optical part made of silicone rubber and a support part made of a plastic material such as polypropylene, but as mentioned above, the support part is made of a material other than silicone rubber. The problem of adhesion between the eyelid and intraocular tissue remains, and no satisfactory solution has been found.

[Objective of the Invention] The object of the present invention is to solve the above-mentioned problems, to provide the supporting portion with appropriate springiness by inserting a core material, to improve intraocular retention, and to achieve biocompatibility. Our objective is to provide an intraocular lens that has both of these features.

[Summary of the Invention] The gist of the present invention to achieve the above object is to provide an intraocular lens comprising an optical part and a support part for holding the optical part, in which at least the support part has a core having spring properties. This intraocular lens is characterized by having a two-layer structure consisting of a material and an outer layer.

[Embodiments of the Invention] The present invention will be described in detail based on embodiments illustrated in FIGS. 1 to 3.

FIG. 1 is a plan view of the intraocular lens according to the first embodiment, where l is an optical part and 2 is a support part. The optical part 1 is made of silicone rubber, for example, and a core material 4 made of a plastic material such as polypropylene is embedded inside a support part 2 having an outer layer 3 made of the same silicone rubber.

The intraocular lens shown in FIG. 1 is produced, for example, by the method described below. That is, a wire rod made of a plastic material such as polypropylene, which has been formed into a loop shape in advance, is inserted into a predetermined position in a mold as a core material 4, and then silicone rubber, which will become an outer layer material 3, is poured into the mold. Firstly, there is a method of forming the optical part 1 and simultaneously making it into an integrated object. By pre-preparing a groove in the mold that is larger than the thickness of the wire, the silicone rubber flows to the support part 2, and as shown in Figure 1, the core material 4 is made of plastic such as polypropylene. So, outer layer material 3
However, the support part 2 made of silicone rubber is manufactured.

Another manufacturing method is to apply silicone coating to the core material 4 of a plastic wire such as polypropylene molded into a loop shape in advance, and then insert the coated support part 2 into a predetermined position in the mold. Ok,
There is a method of forming the optical part 1 by pouring silicone rubber and integrating it.

The intraocular lens constructed in this way has a supporting part 2 having a core material 4 made of a plastic material such as polypropylene, so it has appropriate springiness and excellent intraocular retention. 3, no E@ adhesion with intraocular tissue occurs.

FIG. 2(b) is a plan view of the intraocular lens according to the second embodiment, and FIG. 2(b) is a sectional view of the intraocular lens according to the second embodiment. A core material 4 made of a transparent plastic material such as acrylic is embedded.

The intraocular lens with this configuration can ensure more sufficient springiness of the support portion 2 than the intraocular lens shown in FIG. 1, and is even more excellent in intraocular retention.

FIG. 3(a) is a plan view of an intraocular lens according to the third embodiment, and FIG. 3(b) is a cross-sectional view thereof. As in the second embodiment, the inside of the optical part 1 is also made of plastic such as polypropylene. Although a core material 4 made of a material is embedded, this core material 4 is different from the second embodiment in that the core material 4 is present only at the peripheral portion of the optical section 1. In this configuration, unlike the second embodiment, the core material 4 to be embedded inside does not need to be particularly transparent; The core material 4 may be embedded in the peripheral portion.

In addition, in the above-mentioned embodiment, all of the support parts 2 were formed into a so-called open loop shape, but it goes without saying that the support part 2 may have a closed loop shape.In that case, the core material may be 4 is located only inside the support part 2 from the vicinity of the connection between the optical part 1 and the support part 2, the core material 4 is located on almost the entire projected area of the optical part 1, and the peripheral part of the optical part 1. The core material 4 may be located in a variety of ways, or the core material 4 may be embedded in a peripheral area provided independently around the optical part 1 as described above. It may be partially arranged inside the optical part 1 and the support part 2 of the intraocular lens, and it is not necessary that they are all made of the same material.

As the material of the core material 4, polypropylene, acrylic, etc. were given as examples in the above-mentioned embodiments, but it may also be a plastic material such as polyvinylidene fluoride, polyimide, or a metal such as a shape memory alloy. In addition, in the embodiment, the optical part 1 is biconvex, but it goes without saying that an intraocular lens having a plano-convex or meniscus shape may also be used.

Furthermore, even if the material to be the outer layer material 3 is not the generally well-known silicone rubber called dimethylsiloxane, as long as it is a silicone rubber with excellent biocompatibility, it can be a silicone rubber with a high refractive index having an aromatic derivative substituent. In addition, if the outer layer material 3 is subjected to a film forming treatment such as a plasma polymerized film for the purpose of imparting hydrophilicity, ultraviolet blocking property, etc., or for the purpose of preventing elution of the composition from the outer layer material 3. , it has better biocompatibility and is safe for living organisms.

[Effects of the Invention] As explained above, the intraocular lens according to the present invention has both the supporting part or the optical part and the supporting part composed of a core material and an outer layer material, so that the core material can provide a suitable amount of support to the supporting part. By providing springiness and improving intraocular retention, we have solved the problem of the eyeball popping out of the eyeball after surgery or being misaligned. By forming this, it has the effect of also having biocompatibility.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 to 3 show an embodiment of the intraocular lens according to the present invention, and FIG. 1 is a plan view of the first embodiment, and FIG.
) is a plan view of the second embodiment, (b) is a sectional view taken along the line AA', @3 (a) is a plan view of the third embodiment, and (b) is a sectional view taken along the line BB'. 4 and 5 are plan views of conventional intraocular lenses. Reference numeral 1 is an optical part, 2 is a support part, 3 is an outer layer material, and 4 is a core material. Patent applicant Canon Co., Ltd. Figure 1 Figure 2 Figure 3 CG)

Claims (1)

[Claims] 1. An intraocular lens comprising an optical part and a support part for holding the optical part, characterized in that at least the support part has a two-layer structure of a core material having spring properties and an outer layer material. .