JP2002177306A - Intraocular lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the contact area of an intraocular lens with the crystalline lens when it is intraocularly implanted. SOLUTION: An intermediate portion 2 is provided in the periphery of an optical lens 1, and four fin-shaped supporting portions 3 are annexed to the periphery of the intermediate portion, and made foldable by a transparent synthetic resin material. The optical lens 1 is formed so as to have refractive power, and four through holes 2a as conduits for improving the flow of the aqueous humor, and a plurality of circular recesses 2b for reducing the contact area of the lens with the crystalline lens in the eye are formed on the side facing the crystalline lens as if to surround the optical lens 1 in the intermediate portion 2 when it is intraocularly implanted.

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 used in place of spectacles or contact lenses and is implanted in an eye in which a crystalline lens remains for correcting refractive effects of myopia and hyperopia.

[0002]

2. Description of the Related Art Glasses and contact lenses are used for correcting myopia and hyperopia. Glasses are inconvenient during intense exercise, and have the inconvenience of changing the size of the field of view. Although contact lenses eliminate the inconvenience of glasses, they are inconvenient in terms of disinfection and the like.

On the other hand, in order to solve these inconveniences, surgery to change the refractive power of the cornea by making an incision in the cornea or shaving the cornea with a laser beam has been performed. However, since surgery is performed directly on the cornea, the influence on the corneal endothelium cannot be avoided. Moreover, even if the eyesight as expected is not obtained as a result of the operation, it is practically impossible to restore the eyesight.

On the other hand, an intraocular lens of a type in which the lens in the patient's eye is removed by surgery and implanted as a substitute, or an intraocular lens of the type in which the lens is not removed and implanted as an auxiliary lens in front of the lens (eye) Inner contact lens). These intraocular lenses have the advantage that they can be removed and replaced by another operation or replaced with another lens.

[0005]

However, intraocular lenses have several problems to be solved. One is that the intraocular lens, particularly in the latter type of intraocular lens, tends to come into contact with the crystalline lens. Contact may damage the lens or cause secondary cataract in the contacting part of the lens, and one of the issues is how to prevent it.

[0006] Also, if the latter type of intraocular lens is to be held between the iris and the crystalline lens, the flow of aqueous humor tends to deteriorate. Aqueous humor is water that replenishes nutrients to the avascular cornea, lens, and the like. If the flow deteriorates, the transparency of the eye cannot be maintained, which causes a phenomenon called ocular opacity. Therefore, a second object is to devise a technique for preventing the flow of aqueous humor even after the intraocular lens is attached.

[0007] In addition, during an operation for mounting an intraocular lens, a part of the patient's eye is incised to form an insertion opening for inserting the intraocular lens. The smaller the better, the better. In order to minimize the incision size, it is preferred that the intraocular lens be bendable so that it can be folded to the smallest possible size. How
A third problem is how to easily bend the intraocular lens.

SUMMARY OF THE INVENTION It is an object of the present invention to solve at least one or two, and preferably all, of the above-mentioned problems, and one of the specific objects is to provide a contact area with a crystalline lens in an eye. It is an object of the present invention to provide an intraocular lens which can be reduced in size.

Another object of the present invention is to provide an intraocular lens capable of reducing the obstruction of the flow of aqueous humor.

Yet another object of the present invention is to provide an intraocular lens which can be easily folded and can be inserted into the eye through a small incision during surgery.

[0011]

In order to achieve the above object, an intraocular lens according to the present invention is an intraocular lens which is used by being mounted between an iris and a crystalline lens in an eye, and has an optical lens having a refractive power. And a support portion for holding the optical lens portion in the eye, wherein a concave portion is formed on a surface of the lens side outside the optical lens portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiment. 1 is a sectional view of an intraocular lens, FIG.
Is a plan view. A ring-shaped intermediate portion 2 having a diameter b is provided around a circular optical lens portion 1 having a diameter a, and four fin-shaped support portions 3 are provided around the intermediate portion 2 symmetrically with respect to the center. I have. The optical lens portion 1, the intermediate portion 2, and the support portion 3 are made of a transparent organic compound having flexibility, and are foldable according to the material and shape.

The optical lens unit 1 has a shape having a refractive power (lens power) on the front and rear surfaces. The intermediate portion 2 is formed with four through holes 2a (holes penetrating the front and rear surfaces of the lens) that serve as water conduits for improving the flow of aqueous humor when implanted in the eye. That is, in a state where the intraocular lens is mounted, each through-hole 2a serves as a water conduit, so that the flow of aqueous humor between the anterior chamber and the posterior chamber of the eye is not hindered. Further, the intermediate portion 2 is made thin so as to make the contact area with the crystalline lens as small as possible, and a plurality of circular depressions 2b are formed so as to surround the optical lens portion 1 in an annular shape. During surgery to insert an intraocular lens into the eye,
In order to enable insertion through a small incision, it is necessary to fold the intraocular lens small, but in the present embodiment, the rigidity of the intermediate portion is reduced by the recess formed by the through hole 2a and the recess 2b formed in the intermediate portion 2. Since it is relatively small, folding at this portion is easy.

Each of the four support portions 3 has a hole 3a at its center, and its periphery is formed in a rounded loop shape avoiding a sharp shape. Note that the number of the support portions 3 and the number of the through holes 2a are not limited to four, and can be arbitrary.

Considering the mydriatic situation in daily life, the diameter a of the circle of the optical lens unit 1 is 4 mm.
It is preferable that the diameter b of the intermediate portion 2 is in the range of 6 mm to 8 mm. In addition, it is preferable that a part or all of the optical lens unit 1 that may come into contact with the iris is coated with a substance having high biocompatibility such as heparin. It is more preferable that the support 3 is coated with the same substance. By doing so, adhesion with the iris can be effectively prevented. This is the same even in another embodiment described later.

FIG. 3 shows this intraocular lens inserted into the eye,
It is sectional drawing of the eyeball which shows the state mounted in the posterior chamber. There is a cornea C, a lens CL, an iris I, and a posterior chamber B, and an intraocular lens is located between the iris I and the lens CL. Then, the four support portions 3 enter between the lens CL and the iris I, and the tips are supported by the posterior chamber ciliary sulcus in the eye. In a state where the intraocular lens is mounted, it is preferable that the contact area between the intraocular lens and the crystalline lens CL is as small as possible. In order to realize this, the contact with the crystalline lens CL is made mainly at the intermediate portion 2 of the intraocular lens, and the surface of the optical lens portion 1 on the crystalline lens side has a curved shape such that the contact with the crystalline lens CL is reduced at the central portion. Have. This intermediate portion 2 has a through hole 2a,
A concave portion of the depression 2b, which is a thin portion, is formed to reduce the contact area at the intermediate portion 2.

According to the present embodiment, the provision of the recesses such as the through-holes 2a and the recesses 2b facilitates bending at that portion, that is, ease of insertion at the time of surgery, and reduction of the lens CL after mounting. And the combined effect of reducing the contact area and promoting the flow of aqueous humor.

FIG. 4 shows another embodiment of an intraocular lens. It comprises an optical lens unit 11, an intermediate unit 12, and a support unit 13. The provision of the four support portions 13 is the same as that of the above-mentioned intraocular lens, but each support portion 13 is provided with a central hole as in the above example in order to obtain further holding strength. Absent. The through-hole 12a formed in the intermediate part 12 and the dent 12b in the thin part are the same as those of the above-mentioned intraocular lens.

The optical lens portion 11 is provided with a plurality of through holes 11a around it for the purpose of improving the flow of aqueous humor. By providing recesses such as the through-holes 12a and the dents 12b, as in the previous embodiment, it is easy to bend at that portion, that is, easy to insert during surgery,
Multiple effects such as reduction of the contact area with the lens after wearing and promotion of aqueous humor flow can be obtained.

FIG. 5 shows another embodiment of the intraocular lens. It comprises an optical lens section 21 and a support section 23. The support portion 23 is provided in two directions outside the optical lens portion 21 without an intermediate portion, and a plurality of through holes 23a are provided near the optical lens portion 21 of the support portion 23.
Each through hole 23a has an elliptical shape, and a portion without a hole contacts the lens CL. By providing the concave portion by the through hole 23a, it is possible to obtain a combined effect of reducing the contact area with the crystalline lens after mounting and promoting the flow of aqueous humor.

[0021]

According to the intraocular lens of the present invention, since the concave portion is formed on the lens-side surface, the contact area with the lens in the eye is reduced. In addition, because it can reduce the obstruction of the flow of aqueous humor and is easy to bend,
It can be inserted into the eye during surgery with minimal damage to the cornea.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an intraocular lens according to an embodiment.

FIG. 2 is a plan view of the intraocular lens of FIG.

FIG. 3 is a sectional view of an eyeball in a state where an intraocular lens is mounted in the eye.

FIG. 4 is a plan view of an intraocular lens according to another embodiment.

FIG. 5 is a plan view of an intraocular lens according to still another embodiment.

[Explanation of symbols]

 1, 11, 21 Optical lens portion 2, 12 Intermediate portion 2, 13, 23 Support portion 2a, 12a, 13a, 23a Through hole 2b, 12b Depression

Claims (10)

[Claims] 1. An intraocular lens used by being mounted between an iris and a crystalline lens in an eye, comprising: an optical lens portion having a refractive power; and a support portion for holding the optical lens portion in the eye. An intraocular lens comprising: a concave portion formed on a surface of a lens body outside the optical lens portion. 2. The intraocular lens according to claim 1, wherein a plurality of the concave portions are arranged circumferentially. 3. The intraocular lens according to claim 1, wherein the recess has a through hole or a depression for reducing a contact area with a lens. 4. The intraocular lens according to claim 1, wherein the recess has a through hole for promoting the flow of aqueous humor. 5. The device according to claim 1, wherein the optical lens portion and the support portion are made of a flexible material, and are foldable near the concave portion. Intraocular lens 6. The intraocular lens according to claim 1, wherein the intraocular lens has a plurality of the support portions. 7. The intraocular lens according to claim 6, wherein the supporting portion has a hole in the center and has a loop shape. 8. The intraocular lens according to claim 1, wherein the intraocular lens is coated with a substance having high biocompatibility. 9. The intraocular lens according to claim 8, wherein the substance having high biocompatibility includes heparin. 10. The diameter a of the circle of the optical lens portion is 4 m.
10. The range of m to 6 mm.
The intraocular lens according to claim 1.