JP2000237218A - Intraocular ring - Google Patents

Abstract

(57) [Summary] [PROBLEMS] An intraocular ring having an open ring shape at the time of insertion, which can be inserted through a small incision opening, and after insertion into a capsule, provided at the distal end of the intraocular ring. To provide an intraocular ring capable of obtaining a compressive load equivalent to that of a closing ring by engaging an engaging mechanism having complementary male and female structures. SOLUTION: This is an intraocular ring which is made of an elastic material and is inserted into the capsular bag so as to be inscribed all around the equator of the capsular bag, and a part of the intraocular ring is cut off. In this state, an engagement mechanism is provided at the distal end portions at both ends, and a continuous ring shape having no portion cut by the engagement of the engagement mechanism is characterized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an intraocular ring. More specifically, it is attached inside the equator of the capsular bag that has undergone extracapsular extraction surgery to treat cataracts,
An intraocular ring for holding the capsular bag in a circular shape.

[0002]

2. Description of the Related Art An intraocular ring for maintaining the shape of a capsular sac (hereinafter simply referred to as a "capsule") after an operation for extracapsular extraction of the lens is disclosed in Japanese Patent Application Publication No. Hei.
An open ring disclosed in Japanese Patent Publication No. 51302 (see FIGS. 33 and 34) and a close ring disclosed in Japanese Patent Publication No. 6-9582 and Japanese Patent Application Laid-Open No. 4-364840 (FIGS. 35 and 36). And 37).

(1) The open ring has the advantage that the intraocular ring can be easily inserted into the capsule, but since the cut portion of the ring becomes a movable part at the same time, the cap of the capsule after the external extraction of the lens capsule is removed. There is a disadvantage that shape retention is poor.

(2) In the case of a close ring, after extracorporeal extraction of the capsular bag, as shown in FIGS. 36 and 37, a sufficient amount of mucus is injected into the capsular bag, and then tweezers P (or an injector for soft lens) is used. (Not shown)), the intraocular ring 100 is pinched and bent into a substantially rectangular shape, and the incision S is formed.
Then, the intraocular ring 100 is gradually inserted into the capsule through the incision H. When inserted into the capsule, the intraocular ring 100 returns to its original annular shape due to its own elasticity and abuts the entire circumference of the equator of the capsule. Therefore, the closed ring is excellent in shape retention of the capsule after lens extraction.

[0005] However, the operation of pinching the intraocular ring 100 with the tweezers P, bending it into a substantially rectangular shape, and gradually inserting the intraocular ring 100 into the capsule through the incision S and the incision H requires a highly skilled technique. Therefore, there is a problem that it is difficult to insert the intraocular ring into the capsule. In addition, the incision becomes larger than that of the open ring, and there is a possibility that an obstacle (for example, postoperative astigmatism) may occur after eye surgery.

On the other hand, EP-A-47892.
No. 9 discloses a lock mechanism that is divided and has a plurality of steps (lock is achieved by insertion engagement).
An intraocular ring 100 having a 102 is disclosed (see FIGS. 31 and 32). In the case of this intraocular ring 100, after the diameter of the intraocular ring 100 is adjusted by the lock mechanism 102, the intraocular ring 100 must be inserted into the capsule, and the divided state like the open ring of the above (1). And cannot be inserted into the capsule, and the drawback of the above-mentioned (2) closing is not solved.

Further, European Patent Application Publication No. 478
In the case of the intraocular ring described in Japanese Patent No. 929, the contraction direction of the capsular bag is the same as the direction in which the size of the ring changes. Therefore, when strong capsular contraction occurs, the ring also undergoes size deformation. For this reason, when a part of the ring adheres to the tissue, there is a problem that the original circular shape cannot be maintained and the ring is deformed, which may cause the displacement of the intraocular lens.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide an intraocular ring having an open ring shape at the time of insertion, which can be inserted through a small incision opening, and after insertion into a capsule. It is an object of the present invention to provide an intraocular ring capable of obtaining a compressive load equivalent to that of a close ring by engaging an engaging mechanism having complementary male and female structures provided at the distal end of the intraocular ring.

[0009]

SUMMARY OF THE INVENTION In one aspect of the present invention, an intraocular ring is made of an elastic material and is inserted into the capsular bag and is configured to inscribe all around the equator of the capsular bag. In a state where a part of the intraocular ring is cut, an engagement mechanism is provided at the distal end portions of both ends, and a continuous ring shape without a portion cut by the engagement of the engagement mechanism. It is characterized by becoming.

It is preferable that the ring engaging mechanism has a male and female structure complementary to each other.

In another aspect of the invention, the intraocular ring comprises:
A partially cut intraocular ring made of an elastic material and configured to be inserted into the lens capsule and inscribed all around the equator of the capsule, wherein the intraocular ring is inserted into the capsule. It is characterized in that when cut, the distal ends of both ends of the cut intraocular ring contact each other to form a continuous shape.

[0012] It is preferable that tapered surfaces are formed at the distal ends of both ends of the intraocular ring.

In yet another aspect of the invention, the intraocular ring is made of an elastic material and is configured to be inserted into the capsular bag and inscribed all around the equator of the capsular bag. An intraocular ring consisting of two or more parts, wherein the two or more parts are provided with engagement mechanisms at both ends so that any adjacent parts can be engaged with each other in a male-female manner. When three or more portions are engaged with each other, they have a continuous ring shape without any cut portions.

Further, it is preferable that a predetermined compressive load is applied when the cut portion of the ring is engaged.

It is preferable that the compressive load is about 250 mgf or more.

Further, it is preferable that at least one end of the intraocular ring is provided with a collar portion, because deviation of both ends of the intraocular ring in the circumferential direction or the axial direction of the intraocular ring can be prevented.

According to the intraocular ring according to the first to tenth aspects of the present invention, the intraocular ring has an open ring shape at the time of insertion, and can be inserted from a small incision opening. By engaging an engagement mechanism having male and female structures complementary to each other provided at the distal end of the intraocular ring, an intraocular ring having a compressive load equivalent to that of the closed ring is obtained.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An intraocular ring (hereinafter simply referred to as "ring") of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory plan view showing an example of a ring according to an embodiment of the present invention and a cross-sectional explanatory view in an engaged state. FIG. 2 is another explanatory view of the ring according to an embodiment of the present invention. FIG. 3 is an explanatory plan view showing an example, FIG. 3 is an explanatory plan view showing still another example of the ring according to one embodiment of the present invention, FIG. 4 is an explanatory plan view showing an engaged state of the ring of FIG. FIG. 5 shows another embodiment 2 of the present invention.
Plane explanatory view showing an example of a two-part ring, FIG.
5 is a plan view showing a state in which two parts are pivotably connected to each other in the ring of FIG. 5, FIG. 7 is a plan view showing a state in which the ring of FIG. 5 is an open ring, and FIGS. 16 to 23 are side views showing the engaged and joined state of the ring of the present invention, and FIGS. 24 to 26 are other embodiments of the present invention. FIG. 2 is a perspective view showing an example of a ring related to FIG.
FIGS. 7 to 30 are partial side views showing other examples of the ring of FIGS.

Embodiment 1 Referring to FIGS. 1A and 1B, a ring 1 according to the present embodiment is made of polymethyl methacrylate (P
MMA), polypropylene (PP), hydrogel, fibronectin, polysulfone, chondroitane sulfate, hyaluronic acid compounds and other biologically compatible substances, such as hydroxyethyl methacrylate, N-vinylpyrrolidone, vinyl alcohol,
Biopolymers such as collagen, elastomers such as silicone rubber and acrylic rubber and mixtures or copolymers thereof, polyethylene, vinyl chloride, polyvinylidene fluoride, polyurethane, ethylene-vinyl acetate polymer,
In addition to materials such as siloxanyl styrene, polymers such as polyurea, polyether, polyester, and copolysiloxane; polymers such as polyacrylate and polymethacrylate; methyl methacrylate, styrene, methyl styrene, vinyl pyridine and similar copolymers;
Consisting of shape memory materials such as alkyl and copolymers such as N, N-dialkylacrylamide and methacrylamide.

The ring 1 is a so-called open ring with a part cut off. A male part M having a protrusion 5 is formed at one end of the cut part, and a protrusion 5 is formed at the other end. And a female part F having a recess 10 complementary to the female part F is formed. The male part M and the female part F constitute the engagement mechanism 2.

When the male part M and the female part F are engaged,
A continuous ring shape without a cut portion is obtained.

Further, in the case of the present embodiment, since the support projection 5 is formed on the male portion M, after the male portion M and the female portion F are engaged, the support projection 5 is formed on the female portion F. Contact the root. As a result, a uniform tension (compression load) is applied to the entire ring 1. In the case of the ring according to the present embodiment, after the male part M and the female part F are engaged and the ring diameter is contracted by 2 mm, a compression load of about 250 mgf or more is obtained.

Embodiment 2 A ring 1 according to this embodiment is shown in FIGS.
An intraocular ring having a structure as shown by the partial plan view of any one of (c) and (d) and the side view of FIG. 17 (d), which is cut when inserted into the capsule. The two ends of the ring come into contact with each other to form a continuous shape.

The material of the ring 1 of the present embodiment is the same as that of the ring of the first embodiment. Also, in the case of the ring according to the present embodiment, when the ends of both ends of the cut ring are brought into contact and the ring diameter is reduced by 2 mm, a compression load of about 250 mgf or more is obtained.

Embodiment 3 The ring 1 of this embodiment is shown in FIGS. 9 (b) and 9 (c).
As shown in FIG. 17C and FIG. 17C, tapered surfaces T1 and T2 are formed at the distal ends of both ends of the ring 1, respectively. This is preferable because the displacement of the contact position between the tapered surfaces T1 and T2 is prevented. The material of the ring 1 of the present embodiment is the same as that of the ring of the first embodiment. Also, in the case of the ring according to the present embodiment, when the diameter of the ring is reduced by 2 mm after the tapered surfaces T1 and T2 are brought into contact with each other, a compression load of about 250 mgf or more can be obtained.

Embodiment 4 A ring 1 according to this embodiment is composed of a part 1a and a part 1b (see FIG. 5).

The portion 1a and the portion 1b are provided with a first projection 5a at one end of the portion 1a and a first projection 5a located at the root of the first projection 5a so that any adjacent portions can be engaged with each other in a male-female manner. One recess 10a is formed, and a second protrusion 5b is formed at the other end. Further, at one end of the portion 1b, a third protrusion 5c fitted into the first recess 10a,
A second recess 10b is formed at the base of c, and a third recess 10c into which the second protrusion 5b is fitted is formed at the other end.

In the ring 1 of the present embodiment, first, the first projection 5a is fitted into the second recess 10b with a jig such as tweezers, and then inserted into the capsule (see FIG. 6). When the third projection 5c is fitted into the first recess 10a, tension is applied to the ring 1. When the mounting position in the capsule is determined in this state, the second protrusion 5b is fitted into the third recess 10c. The material of the ring 1 of the present embodiment is the same as that of the ring of the first embodiment. Also, in the case of the ring according to the present embodiment, the first projection 5a is fitted into the second recess 10b, the third projection 5c is fitted into the first recess 10a, and the second projection 5a is further fitted.
After fitting b into the third recess 10c, the ring diameter is set to 2 m.
When contracted by m, a compression load of about 250 mgf or more is obtained.

The ring of the present invention is a so-called open ring having one or more cut portions. In the embodiments described above, the engagement or contact mechanism at the cut portion has been described with reference to the drawings, but is not limited to these engagement and contact mechanisms.

Also, intraocular pressure-lowering agents such as distigmine bromide, cartelolol chloride and timolol maleate, therapeutic agents for cataract such as pirenoxine and glutathione, acyclovir, idoxuridine, oxytetracycline hydrochloride, ofloxacin, sodium sulbenicillin, hydrochloride Ophthalmic treatments such as cefmenoxime, tobramycin, micronomycin sulfate, pimaricin, or anti-inflammatory agents such as dexamethasone sodium phosphate, fluorometholone, betamethasone sodium phosphate, indomethacin, and pranoprofen; An antifungal agent such as griseofulvin, an antibacterial agent such as gentamicin sulfate, an antiviral agent such as vidarabine, acyclovir, didanosine, and a diagnostic agent such as sodium fluorescein are used on the surface (ring and water) of the ring of the present invention. When either coating on the contact surface) of the body sac, or those mixed in the ring of material attached to the capsular bag achieves a drug sustained release effect.

Fifth Embodiment As shown in FIGS. 24 to 26, a ring 1 according to the present embodiment is different from the ring 1 except that a flange portion FL is provided at a portion where both ends of the ring 1 abut. Embodiment 2
Is the same as the ring 1.

As the shape of the flange portion FL, in addition to the shapes shown in FIGS. 24 to 26, those having the shapes shown in FIGS.

[0034]

According to the present invention, an intraocular ring having an open ring shape at the time of insertion can be inserted through a small incision opening, and is provided at the distal end of the intraocular ring after insertion into the capsule. By engaging engagement mechanisms having complementary male and female structures, an intraocular ring having a compressive load equivalent to that of a close ring is provided.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing an example of a ring according to an embodiment of the present invention and an explanatory sectional view in an engaged state.

FIG. 2 is an explanatory plan view showing another example of the ring according to the embodiment of the present invention.

FIG. 3 is an explanatory plan view showing still another example of the ring according to the embodiment of the present invention.

FIG. 4 is an explanatory plan view showing an engaged state of the ring of FIG. 3;

FIG. 5 is an explanatory plan view showing an example of a two-part ring according to another embodiment of the present invention.

FIG. 6 is a plan view showing a state in which two parts of the ring in FIG. 5 are pivotably connected.

FIG. 7 is a plan view showing a state when the ring in FIG. 5 is an open ring.

FIG. 8 is a partial plan view showing an engaged state of the ring of the present invention.

FIG. 9 is a partial plan view showing another example of FIG. 8;

FIG. 10 is a partial plan view showing still another example of FIG. 8;

FIG. 11 is a partial plan view showing still another example of the ring of FIG. 8;

FIG. 12 is a partial plan view showing still another example of the ring of FIG. 8;

FIG. 13 is a partial plan view showing still another example of the ring of FIG. 8;

FIG. 14 is a partial plan view showing still another example of the ring of FIG. 8;

FIG. 15 is a partial plan view showing still another example of the ring of FIG. 8;

FIG. 16 is a side view showing an engaged state of the ring of the present invention.

FIG. 17 is a side view showing another example of FIG. 16;

FIG. 18 is a side view showing still another example of FIG.

FIG. 19 is a side view showing still another example of FIG. 16;

FIG. 20 is a side view showing still another example of FIG. 16;

FIG. 21 is a side view showing still another example of FIG. 16;

FIG. 22 is a side view showing still another example of FIG. 16;

FIG. 23 is a side view showing still another example of FIG. 16;

FIG. 24 is a perspective view showing an example of a ring according to another embodiment of the present invention.

FIG. 25 is a perspective view showing an example of a ring according to another embodiment of the present invention.

FIG. 26 is a perspective view showing an example of a ring according to another embodiment of the present invention.

FIG. 27 is a partial side view showing still another example of the ring of FIGS.

FIG. 28 is a partial side view showing still another example of the ring of FIGS.

FIG. 29 is a partial side view showing still another example of the ring of FIGS.

FIG. 30 is an explanatory partial side view showing still another example of the ring of FIGS.

FIG. 31 is a plan view showing an example of a conventional ring.

FIG. 32 is a partially enlarged view of FIG. 31.

FIG. 33 is a plan view showing another example of the conventional ring.

34 is a plan view showing a state at the time of insertion into the capsule in FIG. 33. FIG.

FIG. 35 is a perspective view showing still another example of the conventional ring.

FIG. 36 is an explanatory view showing a conventional method of inserting a ring into a capsule.

FIG. 37 is an explanatory view showing a conventional method of inserting a ring into a capsule.

[Explanation of symbols]

 1 ring 2 engagement mechanism M male part F female part FL collar

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C081 AB21 BB07 CA021 CA041 CA051 CA081 CA101 CA131 CA161 CA191 CA211 CA271 CA281 CD071 CD081 CD171 DA16 4C097 AA24 BB01 CC01 DD01 EE02 EE03 EE04 EE13 EE16 EE19 FF01 SA05

Claims (10)

[Claims] 1. An intraocular ring made of an elastic material, which is inserted into a capsular bag and is inscribed all around the equator of the capsular bag, wherein a part of the intraocular ring is cut. The intraocular ring is characterized in that an engagement mechanism is provided at the distal end portions at both ends in a state where the end portion is in a closed state, and the ring has a continuous ring shape with no portion cut by the engagement of the engagement mechanism. 2. The intraocular ring according to claim 1, wherein the engagement mechanism of the ring has a male and female structure complementary to each other. 3. A partially cut intraocular ring made of an elastic material and inserted into the capsular bag and configured to inscribe over the equator of the capsular perimeter. An intraocular ring characterized in that, when the ring is inserted into the capsule, the distal ends of both ends of the cut intraocular ring come into contact with each other to form a continuous shape. 4. The intraocular ring according to claim 3, wherein tapered surfaces are formed at both ends of the intraocular ring. 5. An intraocular ring comprising two or more parts, which is made of an elastic material and is inserted into the capsular bag and is inscribed all around the equator of the capsular bag. Two or more parts are provided with engagement mechanisms at both ends so that any adjacent parts can be engaged with each other in a male-female manner. When the two or more parts are engaged with each other, An intraocular ring characterized in that it has a continuous ring shape without any cut portions. 6. The intraocular ring according to claim 1, wherein a predetermined compressive load is applied when the cut portion of the ring is engaged. 7. The intraocular ring according to claim 6, wherein said compressive load is about 250 mgf or more. 8. The intraocular ring according to claim 3, wherein a predetermined compressive load is applied when the cut portion of the ring is in contact with the intraocular ring. 9. The intraocular ring according to claim 8, wherein said compressive load is about 250 mgf or more. 10. The intraocular ring according to claim 3, wherein a collar portion is provided on at least one end of the intraocular ring.