JP2572585Y2 - Late cataract prevention device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing late cataract (hereinafter simply referred to as a preventive device). More specifically, the present invention relates to a preventive device for maintaining the shape of the capsular bag after removing the lens substantially substantially circular and preventing the production of collagen and the like in the capsular bag.

[0002]

2. Description of the Related Art Conventionally, as a method for cataract surgery, a method has been adopted in which an opening is provided in an anterior capsule and a lens is removed through the opening. Thereafter, the refractive power of the eye is corrected by inserting an intraocular lens into the capsule in place of the removed lens, wearing a contact lens on the cornea, or wearing glasses.

[0003]

[Problems to be solved by the invention] However, if the capsule is left as it is after removal of the lens, epithelial cells remaining in the equator of the capsule will proliferate and degenerate, or part of it will become metaplasia. May cause clouding of the capsule. This phenomenon is commonly called late cataract and requires surgery again. When inserting and fixing the intraocular lens in the capsule after removing the lens, the shape of the capsule is maintained depending on the shape of the support of the intraocular lens,
Some epithelial cells remaining in the equatorial region are confined by the supporting portion, and the occurrence of late cataract can be prevented to some extent. However, since the supporting portion does not cover the entire circumference of the equatorial portion, it is not complete.

Further, when an intraocular lens is not inserted, that is, when a vision is corrected by wearing a contact lens or using eyeglasses in combination, most of the sac left untouched after a long time elapses. Inconveniences such as late cataract occur. In addition, if the capsule is removed, various complications are likely to occur, such as the vitreous body behind the capsule moving forward. Therefore, the capsule is not removed unless an intraocular lens is inserted.

The present invention has been made in order to solve the above-mentioned problem, and it is an object of the present invention to provide a preventive device capable of preventing the occurrence of a secondary cataract and enabling a stable circular holding of the equator of the capsule. I have.

[0006]

The late cataract preventive device of the present invention is made of an elastic material and has a substantially annular shape. The device is inserted into the capsular bag and extends all around the equator of the capsular bag. Sac around the entire circumference so that it touches
At least two substantially protruding ridges inscribed in the equatorial portion of the camera .

[0007] The "substantially annular shape" referred to in the claims of the utility model registration means that the annular shape is not only a perfect circle but also, for example, such that its outer periphery can be inscribed all around the equatorial portion of the capsule. This is a concept including the polygonal shape.

[0008]

The protective device of the present invention can be easily bent into a desired shape by lightly picking it with tweezers or the like, so that a special insertion technique is not required and the CCC (Continuous Circular Capsulorhexi) is not required.
s) It can be easily inserted into the capsule even through a small incision by the method. After insertion, the protective device returns to its original circular shape due to its elasticity, so that the outer surface of the protective device is inscribed all around the equatorial portion of the sac and the epithelial cells remaining in the equatorial portion of the sac are removed. It can be confined between the equator and the outside of the protective device, and the proliferation of residual epithelial cells can be prevented well. On the other hand, since the equatorial portion of the capsule can be held almost completely in a circular shape, tension is given to the capsule itself and contraction of the capsule can be effectively prevented. With the above operation, the occurrence of secondary cataract can be prevented.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a protection device according to the present invention.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the protection device of the present invention, FIG. 2 is a partially omitted sectional view taken along the line II-II of FIG.
FIG. 3 is a partially omitted cross-sectional view showing another embodiment of the protection device of the present invention, FIGS. 4 to 7 are explanatory views showing how to use the protection device of FIG. 1, and FIG. 8 is another embodiment of the protection device of the present invention. FIG. 9 is a perspective view showing an example, and FIG. 9 is an explanatory view showing how to use the protection device of FIG.

In FIG. 1, reference numeral 1 denotes a preventive device 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 typical capsule. Therefore, the outer diameter and thickness are not limited to the above 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 assisting tool, there may be a case where the size is out of the above-mentioned range.

As shown in FIG. 2, the cross-sectional shape of the wire portion is substantially square, and the length of one side is about 1
mm. In the present invention, the outer side of the preventive device 1 forms a substantial ridge for containing epithelial cells remaining in the equatorial portion of the capsule.
The cross-sectional shape is not limited to a square cross-section, and may be a cross-sectional shape as shown in FIG. 3, for example.

In the protective device 1 having a square cross section as shown in FIG. 2, a corner 1a forming a ridge over the entire outer periphery is formed, and the outer corner 1a is substantially formed with the capsule. Because of the line contact, the remaining epithelial cells can be well encapsulated in the equator of the sac, and the remaining epithelial cells can proliferate and degenerate, or a part of the sac can be formed by metaplasia. Since cloudiness can be suppressed, it is preferable because secondary cataract, which is a postoperative problem, can be effectively prevented. The corner 2a of the preventive device 2 shown in FIG. 3 also has a ridge over the entire circumference, and produces the same effect as 1a. In addition, since the preventive device 2 has a concave shape in the center of the outer periphery, when the preventive device 2 is inserted into the eye as described later, tweezers and the like easily fit along the concave portion when the preventive device 2 is inserted. 2 can be deflected.

As the material of the preventive device 1, a material having elasticity is selected for insertion into the capsule and stable fixing in the capsule. In this embodiment, silicone rubber is used as such a material. However, the present invention is not particularly limited as long as it is suitable for ophthalmic medical use, such as biocompatibility and shape stability. Examples thereof include water-absorbing polymers such as hydroxyethyl methacrylate, N-vinylpyrrolidone, and vinyl alcohol; biopolymers such as collagen; and elastomers such as silicone rubber and acrylic rubber, and mixtures or copolymers thereof.

Further, synthetic resins having poor transparency such as polyethylene, polypropylene vinyl chloride and polyvinylidene fluoride used as ordinary medical materials, and hard synthetic resins such as polymethyl methacrylate may be used. Elasticity can be imparted by suitably selecting the shape, thickness, and the like, so that the material can be used as a preventive material.

Further, the preventive devices 1 and 2 of the present embodiment are integrally formed of a single material for ease of manufacture, and are easily manufactured by molding or the like.

Next, the use of the protective device 1 constructed as described above will be described with reference to FIGS. 4 to 7, K indicates an iris having a dilated pupil, H indicates an incision provided in front of the capsule (anterior capsule), S indicates an incision provided in the sclera, and P indicates tweezers. Is shown. First, the cataractous lens is removed from the incision H through the incision S, and the mucus is sufficiently injected into the capsule. Then, using Tweezers P, preventive device 1
And bend it into an almost elliptical shape, and gradually insert it into the capsule through the incision S and the incision H (FIGS. 4 and 6).
reference). In order to insert the preventive device 1 into the capsule, a tool other than tweezers, that is, a commercially available soft IOL injector or the like can be used. When inserted, the preventive device 1 restores its original circular shape by its own elasticity, so that it comes in contact with the entire equatorial portion of the capsule (see FIGS. 5 and 7). As a result, epithelial cells remaining in the equatorial region are sealed in the equatorial region, and the sac is given tension, so that shrinkage of the sac can be effectively prevented, and the occurrence of secondary cataract can be favorably prevented.

FIG. 8 shows another embodiment of the protection device.

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

With this configuration, the prevention device 3
As shown in FIG. 9, one end 3a can be inserted from the other end 3b into the groove 3c to reduce its outer diameter, so that it can be more easily inserted into the eye.

[0021]

[Effect of the Invention] By inserting the preventive device of the present invention into the sac, the preventive device is inscribed all around the equator of the sac, and the epithelial cells remaining in the equatorial portion of the sac can be sealed in the equator. In addition, clouding of the capsule due to cell proliferation can be prevented well. Further, since the prevention device can maintain the shape of the capsule in a circular shape, it is possible to prevent contraction of the capsule and to better prevent the occurrence of secondary cataract.

On the other hand, since the protective device maintains the shape of the capsule in a circular shape, the shape of the incision in the capsule can be well maintained. Can be easily adjusted, and the inserted intraocular lens can be fixed well.

[Brief description of the drawings]

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

FIG. 2 is a partially omitted sectional view taken along the line II-II of FIG.

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

FIG. 4 is an explanatory view showing how to use the protection device of FIG. 1;

FIG. 5 is an explanatory view showing how to use the protection device of FIG. 1;

FIG. 6 is an explanatory view showing how to use the protection device of FIG. 1;

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

FIG. 8 is a perspective view showing another embodiment of the protection device of the present invention.

FIG. 9 is an explanatory view showing how to use the prevention device of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prevention tool 2 Prevention tool 3 Prevention tool

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidenobu Nagai 2-18-15 Noritakeshinmachi, Nishi-ku, Nagoya City, Aichi Prefecture Menicon Corporation Noritake Plant (56) References JP-A-4-364840 (JP, A) JP-A-4-183465 (JP, A) JP-A-61-165727 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61F 2/14, 2/16 A61F 9/00 580 A61M 29/00

Claims (1)

(57) [Scope of request for utility model registration] 1. It is made of an elastic material and has a substantially annular shape. It is inserted into the capsular bag and inscribes the equatorial portion of the capsular body over the entire circumference.
At least two substantial protrusions inscribed in the equator of the capsule
A device for preventing late cataract having a corner that forms a ridge.