CN113545887A

CN113545887A - Intraocular lens

Info

Publication number: CN113545887A
Application number: CN202110369208.0A
Authority: CN
Inventors: 甲斐元虎
Original assignee: Fuluo Shanghai Medical Equipment Co ltd
Current assignee: Fuluo Shanghai Medical Equipment Co ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-10-26

Abstract

The present invention relates to an intraocular lens, comprising: an inner lens having a first refractive index and composed of a first polymer; and an outer lens formed in a manner of coating the inner lens, having a second refractive index and composed of a second polymer. The multifocal intraocular lens is manufactured by forming the inner package structure by using two polymer materials with different refractive indexes, and the multifocal intraocular lens with various different refractive indexes can be easily realized by using a simple mold design structure.

Description

Intraocular lens

Technical Field

The present invention relates to an intraocular lens, and more particularly, to a multifocal intraocular lens made of a plurality of materials having different refractive indices.

Background

An intraocular lens (IOL) is an artificial lens that can be implanted in the eye to replace the natural lens in a human eye that has become clouded due to cataract disease, or for refractive surgery to correct the vision of the human eye. Since the lens in a human eye has some flexibility, it allows the eye to accommodate far or near vision through the action of the ciliary muscles. If a monofocal intraocular lens is used to replace the natural lens, the patient's focal distance is fixed and improved results cannot be achieved at both near and far distances, i.e., the range of clear vision will become narrower. To solve this problem, multifocal intraocular lenses have been proposed.

Conventionally, methods for producing multifocal intraocular lenses include a method for producing an intraocular lens by a machine cutting and a method for producing an intraocular lens by a mold.

As a method for manufacturing an intraocular lens by using a workshop cutting, there is known a cutting method generally called zone (zone) type, in which a plurality of cutting curves having different curvatures are previously set in a cutting procedure, and a desired multifocal intraocular lens is finally obtained by cutting a block of a lens material layer by layer in accordance with all the cutting curves.

Yet another method of forming an intraocular lens from a mold is by using the principles of cast molding. By designing a mold to match the desired power of the intraocular lens, a polymer monomer mixture, which is the starting material for the intraocular lens, is injected into the mold and the liquid mixture is allowed to complete polymerization in the mold to form an intraocular lens material having a particular curvature. Finally, cutting the artificial lens with a specific size by using a mechanical cutting tool.

Disclosure of Invention

Technical problem to be solved by the invention

In the above-described method of the workshop cutting, in order to cut out an intraocular lens having multiple focal points, it is necessary to design cutting curves having different curvatures for different refractive indexes of different parts, respectively, and obtain a complete cutting procedure by combining the cutting curves and performing a cutting process to obtain a final basic power and an additional power. Since a cutting program needs to be designed as a whole by taking the basic power and the supplementary power of the multifocal intraocular lens into consideration, very precise calculation and advanced cutting technology are required.

Yet another method of using the mold is used primarily in the manufacture of diffractive multifocal intraocular lenses. Similar to the cutting method, in order to fabricate a mold having a complex diffraction pattern in a zigzag shape, it is also necessary to take a comprehensive consideration of the basic power and the add power of the multifocal intraocular lens for a general design, and thus complicated operations and relatively advanced techniques are also required in the design process of the mold.

Accordingly, an object of the present invention is to provide an intraocular lens capable of easily manufacturing multifocal intraocular lenses having a plurality of different refractive indexes by a simple design structure and a simple manufacturing process.

Solution for solving the above technical problem

A first aspect of the present invention relates to an intraocular lens comprising: an inner lens having a first refractive index and composed of a first polymer; and an outer lens formed in a manner of coating the inner lens, having a second refractive index and composed of a second polymer.

In the intraocular lens according to the second aspect of the present invention, in the first aspect, the first refractive index is greater than the second refractive index or less than the second refractive index.

In the intraocular lens according to the third aspect of the present invention, in the first aspect, the first polymer and/or the second polymer is polymerized from a monomer mixture containing at least a (meth) acrylate monomer having an aryl group and a (meth) acrylate having a fluorine-substituted alkyl group.

An intraocular lens according to a fourth aspect of the present invention is the intraocular lens according to the first or second aspect, wherein the inner lens and the outer lens are both circular and have respective centers of circles disposed on the same optical axis.

An intraocular lens according to a fifth aspect of the present invention is the intraocular lens according to the first or second aspect, wherein the inner lens and the outer lens are both circular and have respective centers of circles disposed on different optical axes.

In the intraocular lens according to the sixth aspect of the present invention, in the first aspect, the inner lens is formed in a fan shape.

A seventh aspect of the present invention is directed to the intraocular lens according to the first aspect, wherein the inner lens is formed of at least two polymers into a concentric structure.

An intraocular lens according to an eighth aspect of the present invention is the intraocular lens according to the first aspect, wherein the outer lens includes an non-optical portion and an optical portion, and the optical portion is in contact with an outer edge of the inner lens.

Technical effects

According to the technical scheme of the invention, the artificial lens is manufactured by forming the inner package structure by using two polymer materials with different refractive indexes, and the multifocal artificial lens with various different refractive indexes can be easily realized by using a simple mold design structure. Further, a multifocal intraocular lens having two refractive indexes with a base refractive power and an add refractive power can be manufactured by changing the curvature of one surface of the outer lens without changing the size of the inner lens, or a multifocal intraocular lens having two refractive indexes with a base refractive power and an add refractive power can be manufactured by changing the curvature of one surface of the inner lens without changing the size of the outer lens. The manufacturing process of the multifocal intraocular lens is simplified into the manufacturing process of the single-focus intraocular lens, the requirements on the operation difficulty and the manufacturing technology are greatly reduced, and the customized requirements are easily met.

Drawings

Fig. 1 is a perspective view of an intraocular lens according to the present invention.

Figure 2 is a top view of an intraocular lens according to the present invention.

Figure 3 is a cross-sectional view in the direction a-a of the intraocular lens of figure 2.

Fig. 4 is a sectional view of a molding die for producing an inner lens according to the present invention.

Fig. 5 is a sectional view of a molding die for producing an outer lens according to the present invention.

FIG. 6 is a flow chart of the manufacture of an intraocular lens according to the present invention.

Description of the reference numerals

100 intraocular lens

1 lens unit

2 part

11 inner lens part

12 outer lens portion.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

< multifocal intraocular lens >

Figure 1 shows a perspective view of a multifocal intraocular lens 100 according to the present invention. Figure 2 shows a top view of a multifocal intraocular lens 100 according to the present invention. Fig. 3 is a cross-sectional view in the direction a-a of intraocular lens 100 of fig. 2.

As shown in fig. 1, the intraocular lens 100 is composed of a lens portion 1 and portions 2 connected to the outer edge of the lens portion 1. The lens portion 1 is substantially disk-shaped and has a thick central portion and slightly convex on both sides. The lens unit 1 is a member having a function of correcting the visual function of the eyeball, and is composed of an inner lens 11 inside and an outer lens 12 outside. the part 2 serves as a connecting and fixing member for supporting and fixing the lens part 1 by adhering the hook-shaped part 2 to the eyeball when the intraocular lens 100 is implanted into the eyeball.

The lens unit 1 is formed by combining an inner lens 11 and an outer lens, and the inner lens 11 and the outer lens 12 are respectively formed by polymer materials having different refractive indexes. The composition and method of formation of the polymeric material will be described later. As can be seen from fig. 3, the inner lens 11 is completely enclosed in the outer lens 12, and the centers of the outer lens 12 and the inner lens 11 are superposed on the same optical axis, and the optical characteristics of the two lenses are superimposed on each other, thereby providing the optical performance which the multifocal intraocular lens finally has.

The optical performance of the multifocal intraocular lens can have special optical performance such as a specific ultraviolet visible transmittance and photochromism, in addition to a specific vision correction power, which enables simultaneous correction of far vision and near vision by having a plurality of focuses, as in a common vision function correction tool.

In the entire lens unit 1, a plurality of focal points are formed at positions in the overlapping region and the vicinity of the overlapping region of the outer lens 12 and the inner lens 11 for correcting the eyesight of the human eye. This portion is also commonly referred to as the optic. The peripheral portion of the outer lens 12 has no such vision correction function, and hence this portion is referred to as an non-optical portion (not shown). However, in the intraocular lens of the present invention, optical properties such as photochromism can be imparted to the non-optical portion, and the details will be described later.

As described above, the lens portion 1 of the intraocular lens 100 according to the present invention is formed in a shape having a thick central portion and a thin peripheral portion. Correspondingly, the inner lens 11 and the outer lens 12 are both in a disk shape with a thick center and thin edges, and form an inner wrap structure in a concentric circle state. In an intraocular lens obtained by the manufacturing method described later, the thickness of the central portion of the inner lens 11 was about 0.1mm, and the thickness of the central portion of the outer lens 12 was 0.75 mm.

But the shapes and the arrangement positions of the inner lens 11 and the outer lens 12 are not limited thereto. For example, the center positions of the inner lens 11 and the outer lens 12 may not coincide with each other. Alternatively, the inner lens 11 may be formed in a fan shape. Further, the inner package structure of the multiple lens materials may have more than one layer, or the multi-focal intraocular lens may be formed by forming two inner packages of three lens materials or multiple inner packages of more lens materials.

Next, the polymer used for producing the intraocular lens material will be described.

< polymers for producing multifocal intraocular lenses >

In the polymer for the preparation of multifocal intraocular lenses employed in the present invention, a combination of a (meth) acrylate monomer having an aryl group and a (meth) acrylate having a fluorine substituted alkyl group, which have high refractive indexes, and a low refractive index, is contained for the purpose of adjusting the refractive index.

As the (meth) acrylate monomer having an aryl group used in the present invention, any one or a combination of more of 2-Phenylethyl methacrylate (Ph-MA, 2-Phenylethyl methacrylate), 2-Phenylethyl acrylate (Ph-a, 2-Phenylethyl acrylate), 2-Phenoxyethyl methacrylate (2-Phenoxy methacrylate), 2-Phenoxyethyl acrylate (2-Phenoxyethyl acrylate), n-Butyl acrylate (n-Butyl acrylate), n-Butyl methacrylate (n-Butyl methacrylate), Ethyl acrylate (Ethyl acrylate), and Ethyl methacrylate (Ethyl methacrylate) can be exemplified.

As the (meth) acrylate having a fluorine-substituted alkyl group used in the present invention, Trifluoroethyl methacrylate (TFE-MA) and/or Trifluoroethyl acrylate (TFE-a) can be exemplified.

On the basis, in order to satisfy the hardness of the polymer obtained by polymerization so that the manufactured intraocular lens can meet the requirement of being foldable, a polymer having a lower glass transition temperature (Tg) can be obtained by appropriately adjusting the mixing ratio of the (meth) acrylate monomer having an aryl group to the (meth) acrylate having a fluorine-substituted alkyl group, or further adding an appropriate amount of an alkyl (meth) acrylate-free compound. As the (meth) acrylate monomer having no aromatic group, n-Butyl acrylate (n-BuA, n-Butyl acrylate) may be exemplified. Examples of the polymer composition ratio and the addition amount and the expected glass transition temperature are shown in table 1 below.

[ TABLE 1 ]

In addition to the (meth) acrylate monomer having an aryl group and the (meth) acrylate having a fluorine-substituted alkyl group as main components, the following other additional components are contained in the polymer.

For example, in order to improve the safety of the polymer to be produced, it is desirable to add a proper amount of a di (meth) acrylate component as a crosslinkable monomer. Examples of the crosslinking monomer to be added for improving the crosslinking property of the polymer include Ethylene Glycol Dimethacrylate (EGDMA) and Butanediol diacrylate (BDDA). In addition, 2,2'-azobis (isobutyronitrile), (AIBN, 2,2' -azobis (isobutonitrile)) was added as a polymerization initiator.

As will be described later, the multifocal intraocular lens of the present invention can be produced as an intraocular lens having different refractive indexes, an intraocular lens having different ultraviolet visible transmittances, an intraocular lens having a photochromic function, or the like. In response to such a production demand, it is also considered to add a polymerizable monomer having ultraviolet absorbability, for example, 2- (2'-Hydroxy-5' -methacryloyloxyethylphenyl) -2H-Benzotriazole (Norbloc7966, 2- (2'-Hydroxy-5' -methacryloyloxyphenyl) -2H-Benzotriazole) as needed; polymerizable monomers having coloring properties, such as 4- (Phenyldiazenyl) phenyl-2-methacrylate (BL01, 4- (Phenyldiazenyl) phenyl-2-methacrylate); and 1-acryloyloxyethyl-3, 3-dimethylspiro [ indoline-2,3'- [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (ADINO, 1-Acryloxyethyl-3, 3' - [3H ] -naptho [2,1-b ] (1,4) oxazine) having a photochromic polymerizable monomer.

Here, it is particularly noted that the specific structural formula of the photochromic polymerizable monomer ADINO is shown below (compound 1).

[ CHEM 1 ]

The photochromic material for intraocular lens is selected from triarylmethane, stilbene, azastilbene, nitrone, fulgide, spiropyran, naphthopyran, spirooxazine, etc. Typical examples thereof include 1',3' -Dihydro-1',3',3'-trimethyl-6-nitro spiro [2H-1-benzopyran-2,2' - (2H) -indole ] (1',3' -Dihydro-1',3',3 '-trimethy-6-nitro spiro [2H-1-benzopyran-2,2' - (2H) -indole ], compound 2), 1,3-Dihydro-1,3,3-trimethyl-spiro [2H-indole-2,3'- [3H ] phenanthro [9,10-b ] (1,4) oxazine (1,3-Dihydro-1,3, 3-trimethy-spiro [2H-indole-2,3' - [3H ] phenanthro [9,10-b ] (1,4) oxazine as a spirooxazine, 3' - [3H ] phenonthro [9,10-b ] (1,4) oxazine, compound 3). Also, a method of manufacturing a photochromic intraocular lens by including these compounds in an intraocular lens material at a concentration of 0.01 to 0.4% by weight is known (see US 8,133,274).

[ CHEM 2 ]

[ CHEM 3 ]

In addition, the use of a polymerizable photochromic material is very important for suppressing elution of the material and improving safety, and specific examples of the compound shown in U.S. Pat. No. 5,166,345 are: 1-acryloyloxyethyl-3, 3-dimethylspiro [ indoline-2,3'- [3H ] naphtho [2,1-b ] (1,4) oxazine ] (1-acryloyloxyethyl-3, 3-dimethylspiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ]), 1-methacryloyloxyethyl-3, 3-dimethylspiro [ indoline-2,3'- [3H ] naphtho [2,1-b ] (1,4) oxazine ] (1-methacryloyloxyethyl-3, 3-dimethylspiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ]), 1-methacryloyloxypropyl-3, 3-dimethylspiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ] (1-methacryloxypropyl-3,3-dimethylspiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ]), 1-methacryloylethyl-3, 3-dimethyl-5-chlorospiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ] (1-methacryloylamidoethyl-3, 3-dimethylspirol-5-chlorospiro [ indoline-2,3' - [3H ] naphtho [2,1-b ] (1,4) oxazine ]), 1-methacryloyloxyethyl-3, 3-dimethyl-8' -methoxyspiro (p-vinylphenethyl) -3,3-dimethyl-5, 6-dichlorospiro [ indoline-2,3'- [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1-methacryloxyeth-3, 3-dimethyl-8' -methoxylphiro (p-vinylphenylethy) -3, 3-dimethyll-5, 6-dhichlorospiro [ indoline-2,3'- [3H ] -naphtho [2,1-b ] (1,4) oxazine ]), 1,3,3-trimethyl-9' -methacryloxyspiro [ indoline-2,3'- [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,3, 3-trimethylloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,3, 3-trimethyloxy-9 '-methacryloxyspirol [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ], 1,3,3-trimethyl-5 '-methacryloyloxymethyl spiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,3,3-trimethyl-5 '-methacryloyloxymethyl spiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ]), 1,3,3-trimethyl-9'-methacrylamide spiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,3,3-trimethyl-9 '-methacrylamido [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine), 1,3,3-trimethyl-5-chloro-8'-acryloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,3,3-trimethyl-5-chloro-8'-acryloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ]), 1-benzyl-3,3-dimethyl-9'-vinylbenzoyloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1-benzyl-3,3-dimethyl-9'-vinylbenzoyloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine), 3-trimethyl-9 '-methacryloyloxyspiro [ indoline-2,3' - [3H ] -pyrido [2,1-b ] (1,4) benzoxazine (3-trimethyl-9 '-methacryloyloxyspiro [ indoline-2,3' - [3H ] -pyrido [2,1-b ] (1,4) benzoxazine), 1 '- (1, 5-pentadiyl) bis [3,3-dimethyl-9' -methacryloyloxyspiro [ indoline-2,3'- [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1, 1' - (1, 5-pentanyl) bis [3,3-dimethyl-9 '-methacryloyloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] ] (1,1 '- (1, 5-pentanyl) bis [3,3-dimethyl-9' -methacryloyloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] ]), 1' - [1,4-phenylenebis (methylene) bis [3,3-dimethyl-5' - (meth) acryloyloxymethyl spiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] ] (1, 1' - [1,4-phenylenebis (methyl) bis [3,3-dimethyl-5' - (meta) acryloyloxymethyl piro [ indole-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] ]), 1' - (1,4-butanediyl) bis [5,6-dichloro-3,3-dimethyl-8' - (meth) acryloyloxy spiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] (1,1"- (1, 4-butandediyl) bis [5, 6-dichoro-3, 3-dimethyl-8' - (meta) acryloxyspiro [ indoline-2,3' - [3H ] -naphtho [2,1-b ] (1,4) oxazine ] ]) or a compound represented by the following chemical formula 4, chemical formula 5 or chemical formula 6.

[ CHEM 4 ]

[ CHEM 5 ]

[ CHEM 6 ]

The method for producing the multifocal intraocular lens of the present invention will be specifically described below with reference to fig. 6.

< method for producing multifocal intraocular lens >

Example 1

The multifocal intraocular lenses of the invention are polymerized from two polymeric materials each having a different refractive index.

The inner lens polymer material is first prepared. Ph-A, n-BuA, TFE-MA, TFE-A, EGDMA, Norbloc7966 and AIBN were added to a 10mL glass bottle in the following amounts, and the mixture was stirred at room temperature for 20 hours to obtain a polymer mixture for an inner lens.

Ph-A: 15g (15 mass%, 13 mol%)

n-BuA: 28g (28 mass%, 33.4 mol%)

TFE-MA: 35g (35 mass%, 31.8 mol%)

TFE-A: 22g (22 mass%, 21.8 mol%)

EGDMA: 2g (2% by mass based on the total amount of Ph-A, n-BuA, TFE-MA and TFE-A)

Norbloc 7966: 0.4g (0.4 mass% based on the total amount of Ph-A, n-BuA, TFE-MA, and TFE-A)

AIBN: 0.3g (0.3% by mass based on the total amount of Ph-A, n-BuA, TFE-MA and TFE-A)

Fig. 4 shows a mold for an inner lens. The mold is made of a resin material and has a pair of upper and lower hollow shapes. The overall diameter length l of the die was 12 mm. A biconvex lens having a diameter r of 2mm was formed in the central portion as an optical portion-forming portion of the inner lens, and the peripheral portion was formed in a uniform flat plate shape having a thickness h of 0.2mm as a non-optical portion-forming portion. The curvature of the inner lens of the two convex shapes is designed to be 40.00mm on the front and 50.00mm on the back.

The polymer mixture for the inner lens is slowly injected into the mold for the inner lens so that no air bubbles are mixed in the polymer mixture injected into the mold. Thereafter, the resin mold filled with the polymer mixture is placed in a polymerization apparatus. The polymerization apparatus was kept in a nitrogen atmosphere and the inside of the apparatus was keptThe pressure of (3) was set to 0.2kgf/cm²(0.0196MPa)。

As a specific procedure of the polymerization, first, the polymerization apparatus was heated from 20 ℃ to 50 ℃ over a period of 30 minutes, and maintained at the 50 ℃ temperature for 8 hours. Then, the temperature was again slowly raised to 120 ℃ over a period of 6 hours, maintained at 120 ℃ for 2 hours, and finally lowered to 40 ℃ over a period of 4 hours.

After completion of the polymerization, the mold is taken out of the polymerization apparatus, opened and the polymer material of the polymerized inner lens is taken out. The polymer material of the inner lens is prepared to have a refractive index n_D ²⁰1.450 polymer material.

The polymer material of the outer lens is next prepared. Ph-MA, Ph-A, n-BuA, EGDMA, Norbloc7966 and AIBN were added to a glass bottle having a capacity of 10mL in the following amounts, respectively, and the mixture was stirred at room temperature for 20 hours to prepare a polymer mixture for an outer lens.

Ph-MA: 56g (56 mass%, 52.1 mol%)

Ph-A: 34g (34% by mass, 34.1 mol%)

n-BuA: 10g (10 mass%, 13.8 mol%)

EGDMA: 2g (2% by mass based on the total amount of Ph-MA and Ph-A, n-BuA)

Norbloc 7966: 0.4g (0.4% by mass based on the total amount of Ph-MA and Ph-A, n-BuA)

AIBN: 0.3g (0.3% by mass based on the total amount of Ph-MA and Ph-A, n-BuA)

Fig. 5 shows a mold for the outer lens. The mold is a pair of upper and lower hollow molds made of a resin material in the same manner. The overall diameter length L of the die is 13-14 mm. A biconvex lens shape with a diameter R of 6mm was formed in the central portion as an optical portion of the outer lens, and the peripheral portion was formed in a uniform flat plate shape with a thickness H of 0.32mm as a non-optical portion. The curvature of the two convex outer lenses is designed to be 25.00mm on the front surface and-19.00 mm on the back surface, and the overall thickness of the two convex lenses can reach 0.70 mm.

Then, the previously prepared inner side is putThe lens polymer material is first put in the center of the optical part of the mold for the outer lens, and the polymer mixture for the outer lens is slowly injected into the mold for the outer lens so that no air bubbles are mixed in the polymer mixture injected into the mold. Then, the resin mold filled with the polymer mixture and having the polymer material of the inner lens immersed in the center thereof is placed in a polymerization apparatus. The inside of the polymerization apparatus was kept in a nitrogen atmosphere, and the pressure in the apparatus was set to 0.2kgf/cm ²(0.0196MPa)。

The polymerization process of the outer lens is substantially the same as the polymerization process of the inner lens. First, the polymerization apparatus was heated from 20 ℃ to 50 ℃ over 30 minutes, and maintained at the 50 ℃ temperature for 8 hours. Then, the temperature was again slowly raised to 120 ℃ over a period of 6 hours, maintained at 120 ℃ for 2 hours, and finally lowered to 40 ℃ over a period of 4 hours.

The refractive index of the polymer material of the outer lens taken out of the mold after completion of the polymerization is n_D ²⁰1.550. And the outer lens polymer material is in a state of containing the inner lens polymer material therein.

The intraocular lens material having the inner coating structure was placed in a desiccator set at 120 ℃ in advance, and heat treatment was performed for 8 hours. Unreacted polymer monomer in the intraocular lens material is removed by the heating process.

This gives an intraocular lens material composed of polymers with two different refractive indices. Then, a machine tool is used to cut a predetermined shape into the material, and finally, a bifocal intraocular lens having two different refractive indices is manufactured.

The intraocular lens thus produced was analyzed by an optical measurement machine, and it was found that the focal power of the central 2mm diameter portion of the intraocular lens was 15.3D, the focal power of the peripheral portion was 19.8D, the entire intraocular lens was formed as a bifocal intraocular lens, and the add power was 4.5D.

In this embodiment 1, the refractive index of the polymer material for the outer lens is formed to be greater than the refractive index of the polymer material for the inner lens. Of course, the refractive index of the polymer material of the outer lens element can be made smaller than that of the polymer material of the inner lens element according to actual needs. The technical solution of the present application can be realized by stacking the inner lens polymer material and the outer lens polymer material having different refractive indexes.

By adopting the manufacturing method, the design process of the bifocal intraocular lens is decomposed into the design of two monofocal intraocular lenses, so that the design difficulty is greatly reduced, and the operation is easy.

It is particularly worth mentioning that during the polymerization of the outer lens polymer material, the outer lens polymer monomer mixture is contacted with the inner lens polymer material immersed therein, and an interpenetrating polymer is formed at the contact interface during the polymerization. The interpenetrating polymers are formed on the interface of the two polymer materials, and the molecular chains penetrate through each other, so that the two polymer materials are mutually embedded, no obvious boundary interface exists, and natural connection is realized. Therefore, the artificial lens material forms a unified whole, the optical performances of different diopters, focuses and the like in different areas are naturally and transitionally changed, and the use feeling of a patient can be improved.

Example 2

The following is a description of the process for making a multifocal intraocular lens formed of two polymers having different visible ultraviolet transmittances.

First, an inner lens polymer material was prepared in the same manner as in example 1. Ph-MA, Ph-A, n-BuA, TFE-MA, BL01, EGDMA, Norbloc7966 and AIBN were added to a 10mL glass bottle and stirred at room temperature for 20 hours to prepare a polymer mixture for an inner lens.

Ph-MA: 24g (24 mass%, 22.1 mol%)

Ph-A: 64g (64 mass%, 63.7 mol%)

n-BuA: 5g (5 mass%, 6.8 mol%)

TFE-MA: 7g (7 mass%, 7.3 mol%)

BL 01: 0.02g (0.02 mass% based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

EGDMA: 2g (2% by mass based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

Norbloc 7966: 1.5g (0.4% by mass based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

AIBN: 0.3g (0.3% by mass based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

Similarly to example 1, the polymer mixture liquid for an inner lens was gradually injected into a mold for an inner lens so that no air bubbles were mixed in the polymer mixture liquid injected into the mold. Thereafter, the resin mold filled with the polymer mixture is placed in a polymerization apparatus. The inside of the polymerization apparatus was kept in a nitrogen atmosphere, and the pressure in the apparatus was set to 0.2kgf/cm ²(0.0196MPa)。

After completion of the polymerization, the mold is taken out of the polymerization apparatus, opened and the polymerized inner lens polymer material is taken out. The polymer material of the inner lens is prepared to have the refractive index of n_D ²⁰1.450 polymer material.

After the inner lens is manufactured, the manufactured inner lens may be subjected to a surface treatment such as a plasma treatment in order to improve the affinity with the polymerization of the outer lens. The process is equally applicable to other embodiments.

The outer lens polymer material is next fabricated. Ph-MA, Ph-A, n-BuA, TFE-MA, EGDMA, Norbloc7966 and AIBN were added to a 10mL glass bottle and stirred at room temperature for 20 hours to prepare a polymer mixture for an outer lens. The composition ratio in the polymer mixture for the outer lens was completely the same as that in the polymer mixture for the inner lens except that no BL01 was included.

Then, it is processedThe polymer material for the inner lens prepared previously is put in the center of the optical portion of the mold for the outer lens, and the polymer mixture for the outer lens is slowly injected into the mold for the outer lens so that no air bubbles are mixed in the polymer mixture injected into the mold. Thereafter, the resin mold filled with the polymer mixture is placed in a polymerization apparatus. The inside of the polymerization apparatus was kept in a nitrogen atmosphere, and the pressure in the apparatus was set to 0.2kgf/cm²(0.0196MPa)。

Following completion of polymerization, the intraocular lens material with the outer lens polymer material encapsulating the inner lens polymer material is removed from the mold. The intraocular lens material was placed in a desiccator set at 120 ℃ in advance, and heat treatment was performed for 8 hours. Unreacted polymer in the intraocular lens material is removed by the heating process.

The intraocular lens material thus obtained was a central lens yellow intraocular lens material composed of polymers having two different visible transmittances of ultraviolet rays. And is formed such that the ultraviolet visible transmittance of the inner lens polymer material is less than the ultraviolet visible transmittance of the outer lens polymer material. Next, a predetermined shape was cut out of this material by a machine tool, and finally, a multifocal intraocular lens having a yellow central lens was produced.

Tinted lenses are also currently known, which are made by adding specific pigments to the inner side of the intraocular lens to reduce post-operative glare, reduce retinal light damage, and reduce post-operative color vision abnormalities. However, conventional colored intraocular lenses are made of a single material, and the lens color varies depending on the refractive power and the thickness of the lens. The multifocal intraocular lens produced in example 2 of the present invention has the advantage that the intraocular lens itself always has a constant visible transmittance of ultraviolet light regardless of whether the focal power is high or low.

Example 3

The following is a description of the process for making a multifocal intraocular lens formed of two polymers having photochromic properties.

The photochromic material is discolored by irradiation of light and becomes transparent in a dark place. Thus, if it is used in an intraocular lens material, it can function like an iris. Its optical performance is similar to that of a camera diaphragm, which controls the amount of light by changing the aperture. And the photochromic material can control the brightness by changing the transmittance of the lens. The two principles are different, but the technical effects can be realized by the two principles are the same.

Conventional photochromic intraocular lenses are made of a homogeneous material, and therefore, the color density is different in lenses of different powers and thicknesses. By using the method of the present invention, however, the color density of the intraocular lens can be maintained consistently across all sizes and all ranges of optical properties.

In the same manner as in example 2, first, an inner lens polymer material was produced. Ph-MA, Ph-A, n-BuA, TFE-MA, ADINO, EGDMA, Norbloc7966 and AIBN were added to a 10mL glass bottle and stirred at room temperature for 20 hours to prepare a polymer mixture for an inner lens.

Ph-MA: 24g (24 mass%, 22.1 mol%)

Ph-A: 64g (64 mass%, 63.7 mol%)

n-BuA: 5g (5 mass%, 6.8 mol%)

TFE-MA: 7g (7 mass%, 7.3 mol%)

ADINO: 0.1g (0.1% by mass based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

Norbloc 7966: 1.5g (1.5% by mass based on the total amount of Ph-MA, Ph-A, n-BuA, and TFE-MA)

Next, the polymer mixture liquid for the inner lens is slowly poured into the mold for the inner lens so that no air bubbles are mixed in the polymer mixture liquid poured into the mold. Then, the resin mold filled with the polymer mixture liquid for the inner lens is set in a polymerization apparatus. The inside of the polymerization apparatus was kept in a nitrogen atmosphere, and the pressure in the apparatus was set to 0.2kgf/cm²(0.0196MPa)。

Next, an outer lens polymer material is prepared. Ph-MA, Ph-A, n-BuA, TFE-MA, EGDMA, Norbloc7966 and AIBN were added to a 10mL glass bottle and stirred at room temperature for 20 hours to prepare a polymer mixture for an outer lens. The composition ratio in the polymer mixture for the outer lens is completely the same as that in the polymer mixture for the inner lens except that ADINO is not contained.

Then, the polymer material for the inner lens prepared previously is put into the center of the optical portion of the mold for the outer lens, and the polymer mixture for the outer lens is slowly injected into the mold for the outer lens so that the polymer mixture injected into the mold is free from air bubbles. Thereafter, the resin mold filled with the polymer mixture is placed in a polymerization apparatus. The inside of the polymerization apparatus was kept in a nitrogen atmosphere, and the pressure in the apparatus was set to 0.2kgf/cm²(0.0196MPa)。

The polymerization process of the outer lens is substantially the same as that of the inner lens. First, the polymerization apparatus was heated from 20 ℃ to 50 ℃ over 30 minutes, and maintained at the 50 ℃ temperature for 8 hours. Then, the temperature was again slowly raised to 120 ℃ over a period of 6 hours, maintained at 120 ℃ for 2 hours, and finally lowered to 40 ℃ over a period of 4 hours.

The outer lens polymer material with the inner lens polymer material encapsulated therein is removed from the mold after polymerization is complete. The intraocular lens material was placed in a desiccator set at 120 ℃ in advance, and heat treatment was performed for 8 hours. Unreacted polymer in the intraocular lens material is removed by the heating process.

Thus, an intraocular lens material having photochromic material encapsulated therein is obtained. Next, the material was cut into a predetermined shape by a machine tool, and finally, an intraocular lens made of a photochromic material was produced. The intraocular lens is provided with a photochromic region for adjusting the amount of light entering the lens at the edge of the outer lens.

The color of the conventional photochromic artificial lens varies with the focal power. In contrast, the intraocular lens produced according to example 3 of the present invention has a constant ultraviolet visible transmittance regardless of whether the focal power of the intraocular lens is high or low.

Further, by applying to examples 1 to 3 above, it is possible to more easily produce a plurality of types of bifocal lenses having a specific add power to the base power by changing only the shape of the outer lens to be produced to have various curvatures while keeping the shape and size of the polymer material of the inner lens placed in the center unchanged.

For example, the inner lens polymer material is formed into a biconvex lens having a front surface with a curvature of 40.00mm and a back surface with a curvature of-50.00 mm, and then the outer lens polymer material is formed to enclose the inner lens polymer material therein, and the outer lens polymer material is formed such that the curvature of the back surface is fixed to-19.00 mm. In this state, a bifocal lens having a specific basic power and a plurality of additional powers can be easily produced simply by freely changing the curvature of the front surface of the outer lens polymer material within the range of 25.00mm to 10.00 mm.

The changes in the base power and the add power of the intraocular lens obtained using the method for manufacturing a multifocal lens of the present invention when the curvature of the inner lens is constant and the curvature of the outer lens is changed only in the front surface are shown in table 2 below.

[ TABLE 2 ]

In general, in order to fabricate a multifocal intraocular lens, a separate design is required according to the entire combination of the base power and the add power even if the add power is constant. In contrast, according to the present method, it is possible to easily produce a variety of bifocal lenses by changing only the refractive power of the outer lens without changing the design of the inner lens, or by changing only the refractive power of the inner lens while keeping the design of the outer lens constant. In addition, the design of each bifocal lens is disassembled into a pure single-focal lens design, so that the complexity of designing the artificial lens is avoided, and the number of the molds which need to be opened again in the manufacturing process can be reduced.

In addition to the above examples, the composition of the polymer mixed liquid for the inner lens and the composition of the polymer mixed liquid for the outer lens can be freely combined. For example, as shown in table 3 below, polymers having various refractive indexes can be obtained by freely selecting the polymer mixture for the inner lens and the polymer mixture for the outer lens from composition examples 1 to 5 shown below. In example 1 above, a combination of composition example 1 as the outer lens and composition example 5 as the inner lens was used, but it is needless to say that other combinations may be used to obtain multifocal intraocular lenses having various optical designs.

[ TABLE 3 ]

It should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects may lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Furthermore, although some embodiments described herein include some but not other features included in other embodiments, combinations of features of different embodiments are intended to fall within the scope of the invention and form different embodiments as would be understood by those of skill in the art. For example, in the appended claims, any of the claimed embodiments may be used in any combination.

It should be noted that the use of particular terminology when describing certain features or aspects of the invention should not be taken to imply that the terminology is being redefined herein to be restricted to including any specific characteristics of the features or aspects of the invention with which that terminology is associated.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Claims

1. An intraocular lens, comprising:

an inner lens having a first refractive index and composed of a first polymer;

and an outer lens formed in a manner of coating the inner lens, having a second refractive index and composed of a second polymer.

2. The intraocular lens of claim 1,

the first refractive index is larger than the second refractive index or smaller than the second refractive index.

3. The intraocular lens of claim 1,

the first polymer and/or the second polymer is polymerized from a monomer mixture containing at least a (meth) acrylate monomer having an aryl group and a (meth) acrylate having a fluorine-substituted alkyl group.

4. The intraocular lens of claim 1 or 2,

the inner lens and the outer lens are both circular and have respective centers of circles arranged on the same optical axis.

5. The intraocular lens of claim 1 or 2,

the inner lens and the outer lens are both circular and have respective centers of circles arranged on different optical axes.

6. The intraocular lens of claim 1,

the inner lens is formed in a fan shape.

7. The intraocular lens of claim 1,

the inner lens is formed of at least two polymers in a concentric circular configuration.

8. The intraocular lens of claim 1,

the outer lens includes a non-optical portion and an optical portion, and the optical portion is in contact with an outer edge of the inner lens.