JPH069582B2 - Intraocular ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention attaches to the inside of the equator of the lens capsule that has undergone extracapsular lens extraction surgery to treat a cataract, and keeps the lens capsule in a circular shape. The present invention relates to an intraocular ring that prevents the intraocular lens from being displaced or deformed by the lens capsule when the intraocular lens is implanted.

[Prior Art and Problems Thereof] In recent years, a patient with a cataract is subjected to extracapsular lens extraction surgery, and then an intraocular lens is implanted into the lens capsule.

Extracapsular surgery is an operation in which the central part of the anterior capsule of the lens is incised in a substantially circular shape to remove the lens nucleus and cortex, leaving the anterior capsule and posterior capsule.

Implantation of an intraocular lens into the capsular bag is generally performed by inserting the lens into the capsular bag through an incision and anterior capsulotomy of the limbus.

After surgery, the lens capsule undergoes fibrosis, but due to the shape of the anterior capsule incision and extension of the lens capsule due to the intraocular lens, etc.,
Non-uniform fibrosis is formed. Then, along with this fibrosis, the lens capsule contracts non-uniformly after the operation, and the intraocular lens contained therein tends to deviate from the central position. Therefore, it is preferable that the lens capsule is uniformly stretched against postoperative fibrosis.

In addition to changes in the lens capsule after surgery, lens epithelial cells remaining in the periphery of the anterior capsule (there is no main body behind the posterior capsule) in addition to fibrosis, and the posterior capsule side Proliferates and moves toward the inside of the posterior capsule, proliferates unevenly on the inner surface of the posterior capsule, forms a secondary cataract, scatters light passing through the posterior capsule, and may cause a decrease in visual acuity after the operation along with fibrosis. Therefore,
It is desirable to suppress the migration and growth of lens epithelial cells to the posterior capsule side after surgery.

Next, the current state of the intraocular lens will be described. At present, various intraocular lenses have been devised and used, but some of them are shown in FIGS. 6 to 15.

The intraocular lens 10 shown in FIG. 6 is an example of a commonly used lens. The structure includes an optical section 12 and J-shaped support sections 14 and 14 that support the optical section 12.

The optical portion 12 is made of a hard and circular transparent convex lens, and the supporting portions 14 and 14 are made of soft and elastic curled mustache.

The intraocular lens 10 can be reduced in size by deforming the support portions 14 and 14, and the insertion of the lens capsule 16 from a relatively small incision (6 to 7 mm) while deforming the support portion during insertion.
Can be inserted inside.

However, this intraocular lens 10 has two J-shaped support parts 1
In order to fix the optical part 12 in the lens capsule 16 by compressing and extending the equator of the lens capsule 16 with 4, 14, as shown in FIG. The equatorial part of 16 is locally deformed so as to protrude, and is considerably wider than its diameter.

Further, since the extension force of the intraocular lens 10 to the lens capsule 16 is point-concentrated, it is easy for the supporting portions 14 and 14 to come out of the lens capsule 16.

Therefore, in order to improve these points, as shown in FIG. 8, an intraocular lens having C-shaped supporting portions 14 and 14 has been devised, and this is also commonly used.

According to the intraocular lens 10, the capsular bag 16 and the support portion 1
Since 4 and 14 are in linear contact with each other, extreme deformation and concentration of force are relieved, but as shown in FIG. 9, they still cause some deformation and concentration of linear force.

Deformation of the lens capsule 16 and the supporting portions 14, 14 are
The disk-shaped intraocular lens 10 shown in FIGS. 10 and 11 has been devised for the purpose of completely suppressing the concentration of force exerted on the lens.

However, the disk-shaped intraocular lens 10 is attached to the lens capsule 1.
When the size is the same as 6, the insertion is impossible and the size is slightly smaller than the capsular bag 16, but the insertion is still difficult and a large incision is required.

In addition, since it is smaller than the lens capsule 16, it is 3
Since there is no contact over 60 degrees and the anterior capsule incision is large, it is easy to cause deviation.

The intraocular lens 10 shown in FIG. 12 comprises an optical section 12 and a pair of ear-shaped support sections 14 and 14 attached to both sides of the optical section 12.

This intraocular lens 10 is a disc type intraocular lens (10th
It can be inserted into the capsular bag through a relatively small incision compared to the figure).

However, when it is inserted into the lens capsule 16, the support portion 14,
Since it has to be inserted into the lens capsule 16 while maintaining the deformed state of 14, the anterior capsule incision may be cut off, and insertion is extremely difficult.

Further, although the supporting portions 14 and 14 that are in contact with the lens capsule 16 are wide, they are not 360 degrees.

The intraocular lens 10 shown in FIG. 13 has an integral structure in which the ring portion 20 is connected to the outside of the optical portion 12 by a pair of bridges 22 and 22.

The intraocular lens 10 can be inserted into the lens capsule by deforming the ring portion 20.

However, although not so much as in the case of the disc type intraocular lens (FIG. 10), it is difficult to insert it into the lens capsule 16 like the intraocular lens 10 shown in FIG. A single letter long incision is required.

The intraocular lens 10 shown in FIG. 14 and FIG.
2 and the support portion 24 are integrally formed of a soft material.

Since the optical part 12 and the support part 24 of the intraocular lens 10 are made of a soft material, they can be folded into a small size, and therefore the incision can be made small.

However, when the lens capsule 16 contracts, the intraocular lens 10 may be displaced or deformed due to the contraction pressure.

[Means for Solving the Problems] An intraocular lens according to the present invention is to be attached to the inner side of the equator of the lens capsule subjected to extracapsular lens removal surgery, and at least inside the equator of the lens capsule. When it is attached, it forms a substantially ring shape, and the diameter when attached inside the equator of the lens capsule is close to the diameter of the equator of the lens capsule.

Here, the intraocular lens is made of a material having elasticity and has a partially cut shape. It is formed to be larger than the equator of the lens capsule in a free state in which the lens capsule is not mounted.

[Function] The equatorial part of the lens capsule is evenly spread over the entire circumference by the intraocular ring and maintains its shape in a circular shape, while suppressing uneven contraction of the lens capsule due to fibrosis of the lens capsule, Deflection and deformation of the intraocular lens are suppressed.

The inner circumference of the equator of the lens capsule where the proliferation of lens epithelial cells is active is pressed by the intraocular ring over the entire circumference, whereby the proliferation of lens epithelial cells on the posterior capsule is suppressed.

With the contraction of the lens capsule, the ends of the intraocular ring abut and stop the contraction, preventing further contraction of the lens capsule.

[Embodiment] FIG. 1 is a plan view of an intraocular ring according to the present invention in a free state, and FIG. 2 is a plan view of the intraocular ring according to the present invention inserted into a lens capsule.

As shown in FIG. 1, the intraocular ring 30 has a shape in which a ring-shaped one is partially cut and the cut side is slightly widened.

The cut ends 32, 32 of the intraocular ring 30
Is slightly inflated, and the opposite end faces of the ends 32, 32 are flat.

The diameter R ₁ of the intraocular ring 30 in the free state is larger than the diameter R of the equator of the lens capsule 16 as shown in FIG. ₁ , and the diameter R ₂ in the state of being compressed and inserted into the lens capsule 16 is As shown in FIG. 2, the diameter is equal to the diameter R of the equator of the lens capsule 16.

The intraocular ring 30 has elasticity so as to extend the equator of the lens capsule 16 to the outside over the entire circumference with appropriate tension when the intraocular lens 10 is inserted inside the lens capsule 16.

This intraocular ring 30 is a material that is safe and familiar to the living body, such as PMMA (polymethylmethacrylate), P
It is made of P (polypropylene), PVDF (polyvinylidene fluoride), or the like.

Next, a case where the intraocular ring 30 is inserted into the lens capsule 16 will be described.

FIG. 3 is a process drawing showing the procedure for inserting the intraocular ring into the lens capsule.

First, the intraocular ring 30 is placed in a crossed state, the crossed portion 30a is sandwiched with tweezers, and the ring-shaped portion 30b is inserted into the lens capsule 16 through the incision and anterior capsular incision (FIG. 1 (a)).

Next, only one end 30c on one side of the intraocular ring 30 is pinched with tweezers, and this end is turned to the anterior capsule incision side and inserted into the lens capsule 16 ((b) to (d) in the same figure).

Next, the other end 30d of the intraocular ring 30 is sandwiched with tweezers so that the entire intraocular ring 30 is rotated and this portion is inserted into the lens capsule 16 ((e) and (f) in the figure). ).

The equatorial part of the lens capsule 16 is evenly extended from the inside to the entire circumference by the intraocular ring 30 to form a flat disc shape.

As shown in FIG. 4, the equator of the lens capsule 16 is pressed against the intraocular ring 30, and the proliferation of the lens epithelial cells 34 remaining on the anterior capsule side to the posterior capsule side is blocked.

When the intraocular lens 10 as shown in FIG. 6 or FIG. 8 is inserted into the lens capsule 16 in this state, the supporting portions 14, 14 of the intraocular lens 10 as shown in FIG. Abutment on the ring 30 prevents the capsular bag 16 from being pulled outwards unevenly by the supports 14,14.

Further, since the intraocular ring 30 does not contract further when the end parts 32, 32 come into contact with each other, the intraocular ring 30 contracts.
Will be blocked here, and the intraocular lens 10 will not be displaced or deformed.

Further, even when a soft intraocular lens as shown in FIG. 14 is inserted, the intraocular lens is not displaced or deformed due to the contraction of the lens capsule.

In addition, although the intraocular ring 30 in which a part is cut is described in the above embodiment, the present invention is not limited to this example, and may be a complete ring shape.

Further, in the above-described embodiment, the intraocular ring 30 in which the end portions are in contact with each other and is not further contracted has been described, but the present invention is not limited to this example, and the end portions are staggered to contract. It may be one.

[Effect of the Invention] According to the invention described in claim 1, the supporting portion of the intraocular lens does not come into direct contact with the equator of the lens capsule and the equator of the lens capsule is projected by the supporting portion of the intraocular lens. It will not deform locally.

According to the invention described in claim 1, contraction of the lens capsule is prevented, and the intraocular lens is always held near the center of the lens capsule.

Further, according to the invention described in claim 1, contraction of the lens capsule is prevented, and fibrosis is accompanied by the contraction of the lens capsule, thereby suppressing a decrease in visual acuity due to displacement of the clouded anterior capsule incision edge toward the center. To be done.

According to the invention described in claim 2, the equatorial portion of the lens capsule is uniformly spread, the generation of wrinkles in the lens capsule is suppressed, the fibrosis of the wrinkle portion is suppressed, and the fibrosis of the wrinkle portion is suppressed. The decrease in visual acuity due to is suppressed.

Further, according to the invention described in claim 2, the inner side of the equatorial part of the lens capsule is compressed from the beginning to the entire circumference, and the proliferation of the anterior capsule of the lens capsule to the posterior capsule side of the epithelial cells is suppressed. The decrease in visual acuity due to the proliferation of lens epithelial cells on the sac is suppressed.

[Brief description of drawings]

1 is a plan view of the intraocular ring according to the present invention in a free state, FIG. 2 is a plan view of the intraocular ring in a contracted state after being inserted into the capsular bag, and FIG. 3 is an intraocular ring in the capsular bag. Fig. 4 is a process diagram showing the procedure for inserting the lens into the lens capsule, Fig. 4 is an explanatory view showing a state in which the intraocular ring is compressing the equator of the lens capsule from the inside, and Fig. 5 shows the intraocular ring and the intraocular lens in the lens capsule. Fig. 6 is a plan view showing the inserted state, Fig. 6 is a plan view of an example of a commonly used intraocular lens, and Fig. 7 is a lens capsule obtained by inserting the intraocular lens shown in Fig. 6 into the lens capsule. FIG. 8 is a plan view showing a state in which the equatorial part of the lens is projectingly deformed. FIG. 8 is a plan view of an intraocular lens of another example that is commonly used.
FIG. 10 is a plan view showing a state in which the intraocular lens shown in FIG. 8 is inserted into the lens capsule, FIG. 10 is a plan view of an example of a disc type intraocular lens, and FIG. 11 is shown in FIG. FIG. 12 is a side view of the intraocular lens shown in FIG. 12, FIG. 12 is a plan view of an anise type intraocular lens, FIG. 13 is a plan view of a complex disk type intraocular lens, and FIG. 14 is a plan view of a soft lens. 1
FIG. 5 is a side view of the soft lens shown in FIG. 10 ... intraocular lens, 12 ... optical part 14 ... support part, 16 ... lens capsule 18 ... edge part, 20 ... ring part 22 ... bridge, 24 ... support part 30 ... intraocular ring , 32 …… Edge

Claims (2)

[Claims] 1. A lens to be attached to the inner side of the equator of a lens capsule subjected to extracapsular resection surgery, which is ring-shaped or substantially ring-shaped when attached at least to the inner side of the equator of the lens capsule. An intraocular ring comprising a member whose diameter when fitted inside the equatorial part of the capsule is similar to the diameter of the equatorial part of the lens capsule. 2. An elastic material, a part of which is cut, and is formed larger than the equator of the lens capsule in a free state in which it is not mounted inside the equator of the lens capsule. Intraocular ring as described.