JPH0558118U - Secondary cataract prevention tool - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a preventive agent for posterior cataract that effectively prevents the occurrence of posterior cataract and also enables the equatorial part of the lens capsule to be stably held in a circular shape. [Structure] The preventive tool 1 is made of an elastic material and has a substantially annular shape, and at its outer circumference, at least two ridges that are inscribed in the equator of the capsule are formed. Have a section. [Effect] Such a preventive device can contain epithelial cells between the outer periphery thereof and the equator of the sac, and can keep the equator in a substantially circular shape.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a secondary cataract preventive device (hereinafter simply referred to as preventive device). More specifically, the present invention relates to a preventive device for maintaining the shape of the lens capsule after removing the lens in a substantially circular shape and for preventing the production of collagen and the like in the capsule.

[0002]

[Prior Art]

 Conventionally, as a surgical method for cataract, a method of providing an opening in the anterior capsule of the lens and removing the lens through the opening has been adopted. Then, the refractive power of the eye is corrected by inserting an intraocular lens into the capsule instead of the removed lens, wearing a contact lens on the cornea, or wearing glasses.

[0003]

[Problems to be solved by the device]

 However, if the capsule after the removal of the lens is left as it is, the epithelial cells remaining in the equatorial part of the capsule proliferate and degenerate, or a part of the epithelium metastasizes, resulting in cloudiness of the capsule. It may occur. This phenomenon is commonly called posterior cataract and requires surgery again. When the intraocular lens is inserted and fixed in the capsule after removal of the lens, the shape of the capsule may be maintained depending on the shape of the support part of the intraocular lens, and the epithelial cells remaining in the equator part due to the support part may remain. There are some that can be contained and can prevent the occurrence of post-cataracts to some extent, but they are not perfect because the supporting part does not extend around the entire equator.

Further, when an intraocular lens is not inserted, that is, when a contact lens is worn or the eyesight is corrected by using eyeglasses, the sac that has been left as it is is almost the case when a long time passes. Inconvenience such as subsequent cataract occurs. However, if the sac is removed, various complications such as the posterior vitreous body advancing forward are likely to occur, so the sac should not be removed even without inserting the intraocular lens.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a preventive device capable of preventing the occurrence of subsequent cataract and capable of stably holding the equatorial part of the sac in a circular shape. There is.

[0006]

[Means for Solving the Problems]

 The posterior cataract preventive device of the present invention is made of an elastic material and has a substantially annular shape, and is configured to be inserted into the lens capsule and inscribed in the equator of the capsule over the entire circumference. It is preferable to have at least two substantial ridges which are inscribed in the equator of the sac over the entire circumference.

The term “substantially having an annular shape” as used in the claims for utility model registration means that the annular shape is not only a perfect circle but also the outer circumference is inscribed in the equator of the capsule over the entire circumference. This is a concept including polygonal shapes of some degree.

[0008]

[Action]

 The preventive device of the present invention can easily be inserted into the capsule even through a small incision by the CCC (Continuous Circular Capsulorhexis) method because it does not require a special insertion technique because it can be easily bent into a desired shape by lightly picking it with tweezers. You can After insertion, the protective device returns to the original circular shape due to its elasticity, so the outer side of the protective device is inscribed in the equator part of the sac over the entire circumference, and epithelial cells remaining in the equator part of the sac are It can be contained between the equator and the outside of the preventive device, and can effectively prevent the proliferation of residual epithelial cells. On the other hand, since the equatorial part of the sac can be maintained in a substantially circular shape, the sac itself is given tension, and contraction of the sac can be effectively prevented. With the above actions, it is possible to prevent the occurrence of subsequent cataracts.

[0009]

【Example】

 Next, the preventive device of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the preventive device of the present invention, FIG. 2 is a partially omitted sectional view taken along the line II-II of FIG. 1, and FIG. 3 is another embodiment of the preventive device of the present invention. 4 to 7 are explanatory views showing how to use the preventive tool of FIG. 1, FIG. 8 is a perspective view showing another embodiment of the preventive tool of the present invention, and FIG. 9 is FIG. It is explanatory drawing which shows the usage of the preventive tool.

In FIG. 1, 1 is a preventive tool having an outer shape of about 10 mm, an inner diameter of about 8 mm, and a width (W in FIG. 2) and a thickness (T in FIG. 2) of about 1 mm. These dimensions are values determined from the size of a general capsule. Therefore, the outer diameter and the thickness are not limited to the above-mentioned dimensions. For example, the outer diameter is generally in the range of 8 to 12 mm and the thickness is generally in the range of 0.4 to 2.0 mm. Further, depending on the material forming the auxiliary tool, the size may be out of the above range.

Further, as shown in FIG. 2, the cross-sectional shape of the wire portion is substantially square, and the length of one side thereof is about 1 mm. In the present invention, the outer shape of the preventive tool 1 may be any cross-sectional shape capable of enclosing epithelial cells remaining in the equator of the sac, and is not limited to a square cross-section, as shown in FIG. 3, for example. It may have a cross-sectional shape.

In the preventive tool 1 having a square cross section as shown in FIG. 2, a corner portion 1a forming a ridge extending over the entire outer circumference is formed, and the corner portion 1a on the outer circumference substantially corresponds to the capsule. Because of the linear contact, residual epithelial cells can be well encapsulated in the equator of the sac, and the residual epithelial cells proliferate and degenerate, or some of them metastasize. Since it is possible to suppress the white turbidity of the sac that occurs, it is possible to effectively prevent the post-cataract that becomes a post-operative problem, which is preferable. The corner portion 2a of the preventive tool 2 shown in FIG. 3 also exhibits a ridge over the entire circumference, and produces the same effect as the above-mentioned 1a. Further, since the center part of the outer periphery of the preventive tool 2 is concave inward, when the preventive tool 2 is inserted into the eye as will be described later, it is easy to prevent the preventive tool by the tweezers or the like along the recessed part. You can bend two.

As a material of the preventive tool 1, a material having elasticity is selected for insertion into the capsule and stable fixation in the capsule. In this embodiment, silicone rubber is used as such a material, but there is no particular limitation in the present invention as long as it is suitable for ophthalmology such as biocompatibility and shape stability. As the resin, water-absorbing polymers such as hydroxyethylmethacrylate, N-vinylpyrrolidone and vinyl alcohol, biopolymers such as collagen, elastomers such as silicone rubber and acrylic rubber, and mixtures or copolymers thereof are used.

Further, it may be a synthetic resin such as polyethylene, polypropylene vinyl chloride, or polyvinylidene fluoride, which has poor transparency and is used as a general medical material, or a hard synthetic resin such as polymethylmethacrylate. By appropriately selecting the shape, thickness and the like, elasticity can be imparted and the material can be used as a preventive material.

In addition, the preventive tools 1 and 2 of the present embodiment are integrally formed of a single material for ease of manufacturing, and can be easily manufactured by molding or the like.

Next, the usage of the preventive tool 1 configured as described above will be described with reference to FIGS. In FIGS. 4 to 7, K represents an iris with mydriasis, H represents an incision in front of the capsule (anterior capsule), S represents an incision in the sclera, and P represents tweezers. Indicates the First, the cataractous lens is removed from the incision H through the incision S, and the mucus agent is sufficiently injected into the capsule. Then, the preventive tool 1 is pinched with tweezers P to bend it into a substantially oval shape and gradually inserted into the capsule through the incision S and the incision H (see FIGS. 4 and 6). Further, in order to insert the preventive tool 1 into the capsule, tools other than tweezers, that is, a commercially available injector for a soft IOL or the like can be used. When inserted, the preventive tool 1 is restored to its original circular shape by its own elasticity, so that it is inscribed in the entire equatorial part of the capsule (see FIGS. 5 and 7). As a result, the epithelial cells remaining in the equator are contained in the equator, and the sac is given tension, which effectively prevents the sac from contracting and prevents the occurrence of post-cataract. ..

Next, FIG. 8 shows another embodiment of the preventive tool.

The preventive tool 3 is a modification of the preventive tool 1 shown in FIG. 1 and has a structure in which one end 3a of the preventive tool is inserted into a groove 3c formed from the other end 3b (see FIG. 8). ..

With such a configuration, the preventive tool 3 can insert the one end 3a from the other end 3b into the groove 3c to reduce the outer diameter thereof, as shown in FIG. Can be inserted more easily.

[0021]

[Effect of the device]

 By inserting the preventive device of the present invention into the sac, the preventive device is inscribed in the entire circumference of the equator of the sac, and the epithelial cells remaining in the equator of the sac can be confined to the equator, which causes cell proliferation. The cloudiness of the sac can be effectively prevented. Further, since the preventive device can maintain the shape of the sac in a circular shape, it can prevent the sac from contracting and better prevent the occurrence of subsequent cataract.

On the other hand, since the preventive device maintains the shape of the capsule in a circular shape, the shape of the incision of the capsule can be maintained well. Therefore, for example, even when the intraocular lens is inserted after the removal of the crystalline lens, It can be inserted easily and the intraocular lens after insertion can be well fixed.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a preventive tool of the present invention.

FIG. 2 is a sectional view with a part of line II-II in FIG. 1 omitted.

FIG. 3 is a partially omitted sectional view showing another embodiment of the preventive tool of the present invention.

FIG. 4 is an explanatory view showing how to use the preventive tool of FIG. 1.

FIG. 5 is an explanatory view showing how to use the preventive tool of FIG. 1.

FIG. 6 is an explanatory view showing how to use the preventive tool of FIG. 1.

FIG. 7 is an explanatory view showing how to use the preventive tool of FIG. 1.

FIG. 8 is a perspective view showing another embodiment of the preventive tool of the present invention.

FIG. 9 is an explanatory view showing how to use the preventive tool of FIG.

[Explanation of symbols]

 1 preventive tool 2 preventive tool 3 preventive tool

Front page continued (72) Inventor Yuriko Mizumoto 2-18-15, Noritake Shinmachi, Nishi-ku, Nagoya, Aichi Prefecture Menicon Noritake Factory, No. 18 (72) Inventor Hidenobu Nagai 2-18, Noritake Shincho, Nishi-ku, Nagoya, Aichi Prefecture No.15 Menikon Noritake Factory

Claims (2)

[Scope of utility model registration request] 1. A preventive tool for posterior cataract, which is made of an elastic material and has a substantially annular shape, and is inserted into the lens capsule and inscribed in the equator of the lens capsule over the entire circumference. 2. The posterior cataract preventive device according to claim 1, wherein the outer periphery thereof has at least two corner portions forming substantially at least two ridges that are inscribed in the equator portion of the capsule over the entire circumference.