JP3636850B2 - Intraocular lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intraocular lens that is inserted into an eye instead of a lens that has been removed by cataract or the like.
[0002]
[Prior art]
A treatment method is generally known in which an intraocular lens is inserted in place of the lens after the lens that has become cloudy due to cataracts is removed by surgical means. When removing the crystalline lens or inserting an intraocular lens, it is preferable to make an incision as small as possible in order to reduce postoperative astigmatism. The lens can be extracted by an ultrasonic emulsification and suction method using an ultrasonic emulsification and suction device, and an excision operation with a small incision of about 3 mm can be performed. On the other hand, insertion of a small incision has become possible with intraocular lenses due to the appearance of a foldable soft intraocular lens.
[0003]
Since soft intraocular lenses are inserted by bending the lens, generally, a flexible material such as silicone or an acrylic polymer is used for the optical part thereof. A so-called three-piece type using a material that is relatively easy to form a loop shape, such as polypropylene (PP) or polyimide, is known as a support for holding the optical part in the eye.
[0004]
Recently, for this 3-piece type soft intraocular lens, a one-piece type intraocular lens formed by manufacturing a synthetic member in which a support part made of a material different from that of the optical part is integrated and then cut. A lens has been proposed. The one-piece type intraocular lens is more productive than the three-piece type, and a rigid material such as polymethyl methacrylate (PMMA), which is difficult to process a loop shape, can be easily used as a support member. It has a feature that it is good and has good intraocular stability.
[0005]
By the way, after the intraocular lens is inserted into the eye, a positioning operation using a surgical instrument such as an insulator is involved in order to place the optical unit at an appropriate position. For this reason, there is one in which a positioning hole for operating a lever or the like is provided at a position that does not affect the visual field region of the eye by utilizing the large diameter of the optical part. For the purpose of inserting the soft intraocular lens from the incision as small as possible by folding, it is desirable that the diameter of the optical part is as small as possible so as not to affect the visual field region, and generally no positioning hole is provided. For this reason, positioning in a soft intraocular lens is performed by operating a support part.
[0006]
[Problems to be solved by the invention]
However, in the one-piece type soft intraocular lens, since the optical part and the support part are integrally formed of different materials, the connection at the boundary surface between the optical part and the support part is not strong. For this reason, if the support portion is operated with a surgical instrument during positioning in the eye, there is a problem that the interface may be broken. The broken support part and optical part had to be taken out of the eye and a new intraocular lens had to be reinserted, which was troublesome.
[0007]
In view of the above problems, the present invention further reduces the possibility of breakage at the interface between the optical part and the support part in a one-piece intraocular lens made of different materials. An object of the present invention is to provide an intraocular lens that can be used.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is characterized by having the following configuration.
[0009]
(1) In a one-piece type intraocular lens that integrally forms a foldable optical part made of a flexible material and a support part made of a material different from the optical part, the intraocular lens is formed of the same material as the optical part, A protrusion provided on the periphery of the protrusion for operating a surgical instrument such as an insulator to be used for positioning after insertion into the eye ; and the support extends from the protrusion It is characterized by being.
(2) In the intraocular lens of (1), the protrusion has a longer peripheral edge than the base of the support .
[0014]
【Example】
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic external view of a one-piece type soft intraocular lens according to an embodiment. 1A is a plan view and FIG. 1B is a side view.
[0015]
Reference numeral 1 denotes an optical unit having a refractive power, and the optical unit 1 is formed of a flexible material that has a memory characteristic and can be folded. As the material, various hydrophilic soft materials represented by hydroxyethyl methacrylate (HEMA), and these hydrophilic soft materials are copolymerized with a rigid methacrylate such as ethyl methacrylate (EMA) for strength. It is possible to use a copolymer or the like having an increased viscosity. The diameter of the optical unit 1 is 5.5 mm. In order to insert from a small incision by folding, it is preferably 6.0 mm or less.
[0016]
Reference numeral 2 denotes a support unit for fixing and holding the optical unit 1 at a predetermined position in the eye, which is formed of a material different from that of the optical unit 1 and has flexibility. The materials include rigid materials represented by PMMA, EMA, etc., and copolymers obtained by copolymerizing these rigid materials with flexible methacrylic acid esters such as 2-ethylhexyl methacrylate. Can be used.
[0017]
Reference numeral 3 denotes a protruding portion formed by protruding from the peripheral portion of the optical portion 1 with the same material as the optical portion 1, and further joined to the peripheral portion of the protruding portion 3 so that the base portion where the skirt of the support portion 2 is extended extends. Has been formed. The thickness of the protruding portion 3 is the same as the thickness (about 0.17 mm) of the support portion 2, but the thickness may be gradually changed from the peripheral portion of the optical portion 1 to be connected to the support portion 2. The protruding part 3 has a side part 3a for operating a surgical instrument such as a lever in contact with the connected support part 2 in the distal end direction. The side portion 3a has a shape in which a surgical instrument can be hooked by an angle formed with the peripheral portion of the optical portion 1 in order to rotate the intraocular lens in the direction of the arrow in the figure. The width of the protruding part 3 including the side part 3a to the support part 2 is about 0.5 mm. This width is preferably at least larger than the width with which the operation surface of a surgical instrument such as a lever comes into contact. Further, the size of the boundary surface where the base of the support portion 2 joins the protruding portion 3 is ensured to be equal to or higher than that of the conventional one so that the connection at the boundary surface is not weakened.
[0018]
In addition, although the protrusion part 3 shown in FIG. 1 is connected with the base of the support part 2 in series from the side part 3a so that a part of the support part 2 may be formed, as shown in FIG. The projecting portion 31 may be made longer in the length direction (the opposite side of the side portion 31a shown in FIG. 3 may be made longer, but in this case, the width is reduced when the optical portion 1 is bent, which is disadvantageous. Is).
[0019]
Next, the manufacturing method of the intraocular lens of an Example is demonstrated easily based on FIG. FIG. 2A is an explanatory view for explaining the formation of the composite member, and FIG. 2B is an explanatory view for turning the intraocular lens from the composite member.
[0020]
First, a hydrophilic flexible material for forming the optical part 1 and the protruding part 3 is polymerized to form a cylindrical optical member 21. The diameter of the optical member 21 is formed with a size in which the width of the protruding portion 3 is added to the size of the optical portion 1. After the optical member 21 formed by polymerization is placed in the center of the reaction vessel 23, a support member 22 for forming the support portion 2 is poured into the periphery of the reaction member 23 and polymerized to create an integrated synthetic member. The inner diameter of the reaction vessel 23 is longer than the total length of the intraocular lens.
[0021]
Subsequently, the created synthetic member is cut into an intraocular lens shape. For the cutting process, the same known cutting method as that for manufacturing a conventional one-piece type hard intraocular lens can be used. The dotted line portion shown in FIG. 2B shows the shape of the intraocular lens cut out by cutting. In order to form the optical part 1 having a diameter slightly smaller than the diameter part of the optical member 21, a part of the optical member 21 forms a part of the support part 2 as the protruding part 3. The intraocular lens produced by the cutting process is sufficiently hydrated by autoclave sterilization, so that the optical part 1 is softened so that it can be bent.
[0022]
Next, positioning in the eye using the above intraocular lens will be described.
[0023]
An incision of about 3 mm is provided in the sclera of the patient's eye, and after removing the cloudy crystalline lens nucleus by ultrasonic emulsification and suction using an ultrasonic emulsification and suction device, the optical unit 1 is attached using a surgical instrument such as an insulator. Insert the folded soft intraocular lens through the wound. The soft intraocular lens inserted into the eye returns to its original shape due to its memory characteristics.
[0024]
The operator performs positioning adjustment so that the inserted intraocular lens is held at an appropriate position in the eye. When the intraocular lens is rotated in positioning adjustment, the side 3a is brought into contact with the distal end of a surgical instrument such as a lever, and the side 3a is operated so as to apply a force. The intraocular lens is rotated by the force applied to the side portion 3a (rotated in the direction of the arrow in FIG. 1), and positioned in the eye. Since the side part 3a of the protrusion 3 is thus operated, the support part 2 does not have to be directly operated. The burden on the boundary surface can be reduced to prevent breakage.
[0025]
In addition, since the connecting portion between the protruding portion 3 and the support portion 2 extends from the side portion 3a so that the base of the support portion 2 is connected in series, the contact surface of the surgical instrument is guided to the side portion 3a. It's easy to do. Further, by adopting such a shape, when the surgeon pushes the support portion 2 and inserts it into the sac, the conventional one concentrates on the connection portion (boundary surface) and a force is applied, whereas the concentration is applied. Since the stress is also applied to the side portion 3a side, the breakage can be suppressed.
[0026]
The embodiment described above can be variously modified. FIG. 4 is a diagram showing a modification example. In FIG. 4, the protruding portion 30 is formed at a position independent of the support portion 2 so as to protrude from the peripheral portion of the optical portion 1. In the operation of the surgical instrument in the positioning adjustment, the lens is rotated by bringing the surgical instrument into contact with the side portion 30a of the protrusion 30. In the case of this intraocular lens, it is not necessary to directly operate the support part 2 with a surgical instrument, so that the possibility of breakage of the support part 2 at the interface with the optical part 1 can be further reduced. In addition, it is preferable to form the protrusion part 30 inside the support part 2a in order not to enlarge the intraocular lens width after folding.
[0027]
The present invention is not limited to the above-described modification examples, and various modifications are possible, and those having the same technical idea are also included in the present invention.
[0028]
【The invention's effect】
As described above, according to the present invention, in the one-piece type intraocular lens made of different materials for the optical part and the support part, it is possible to prevent breakage of the support part when the lens position is adjusted by a surgical instrument such as an insulator. it can.
[Brief description of the drawings]
FIG. 1 is an example of an intraocular lens according to the present embodiment.
FIG. 2 is an example of a method for manufacturing an intraocular lens according to the present embodiment.
FIG. 3 is an example of a modification example of the intraocular lens according to the present embodiment. FIG. 4 is another example of a modification example of the intraocular lens according to the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical part 2 Support part 3, 30, 31 Protrusion part

Claims (2)

In a one-piece type intraocular lens in which a foldable optical part made of a flexible material and a support part made of a material different from the optical part are integrally formed, it is formed of the same material as the optical part, and is provided at the periphery thereof Provided with a protrusion for operating a surgical instrument such as an insulator to be used for positioning after positioning in the eye, and the support portion extends from the protrusion. Characteristic intraocular lens. The intraocular lens according to claim 1, wherein the protrusion has a peripheral edge longer than a base of the support .

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