CN117898858A - Intraocular lens - Google Patents

Abstract

The invention discloses an intraocular lens, comprising: the body, the body forms nearly ellipsoid structure, and the rear side middle part of body is provided with the recess, and the recess is towards the sunken setting in the middle of the body to dodge eye lens capsule back wall. Thus, tissue contact of the intraocular lens with the posterior wall of the lens capsule can be reduced, and thus the effects of allograft tissue proliferation can be avoided.

Description

Intraocular lens

Technical Field

The invention relates to the technical field of ophthalmic medical equipment, in particular to an intraocular lens.

Background

Cataract extraction in combination with intraocular lens implantation remains the only effective means of treating cataract for some time now and in the future. Although the traditional single-focus intraocular lens implanted after cataract surgery can obtain good far vision, the single-focus intraocular lens does not have focusing capability, so that patients generally have presbyopia after surgery, and the requirements of different short-distance work are met by relying on glasses.

The multifocal intraocular lens adopts a unique optical design, can form two or more focuses in the eye simultaneously, and can select different focuses by adjusting the size of pupil after the operation of a patient, thereby meeting the requirements of far vision and near vision, reducing the lens wearing rate of the cataract patient after the operation, but simultaneously having the defects that a plurality of focuses can generate halation and glare for the patient, and the like.

In recent years, many students have attempted to design accommodating intraocular lenses by changing the filling amount of an optical fluid medium (e.g., silicone oil) in the capsular bag or changing the type of optical fluid medium, and thus the shape or optical path of the accommodating intraocular lens itself, to accommodate the refractive power of the intraocular lens.

In the related art, accommodating intraocular lenses are asymmetrically ellipsoidal, and there is also the problem of contact with the lens capsule posterior wall tissue.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, it is an object of the present invention to provide an intraocular lens that reduces tissue contact between the intraocular lens and the posterior wall of the lens capsule, thereby avoiding the effects of proliferation of foreign tissues.

An intraocular lens according to an embodiment of the present invention includes: the body, the body forms nearly ellipsoid structure, the rear side middle part of body is provided with the recess, the recess orientation the body is middle sunken to set up, in order to dodge the ocular lens capsule back wall.

Thus, the intraocular lens can reduce tissue contact between the intraocular lens and the posterior wall of the lens capsule, thereby avoiding the effects of proliferation of foreign tissues.

According to an embodiment of the invention, the body comprises: the front bag body is connected with the rear bag body to form a cavity, and the groove is formed in the middle of the rear bag body.

According to the intraocular lens of the embodiment of the present invention, the groove is also provided in the middle of the anterior capsule.

According to an embodiment of the invention, the bottom of the groove of the anterior capsule and/or the posterior capsule is configured as an optical convex lens.

According to the intraocular lens provided by the embodiment of the invention, the optical convex lens is a PMMA film layer, and the hardness of the optical convex lens is between 80A and 90A on the Shore scale.

According to the intraocular lens of the embodiment of the present invention, the outer radius of curvature of the optical convex lens on the anterior capsule is ρ1, ρ1 satisfying the relation: ρ1 is more than or equal to 9mm and less than or equal to 11mm; the outer curvature radius of the optical convex lens on the rear capsule body is ρ2, and ρ2 satisfies the relation: ρ2 is less than or equal to 5mm and less than or equal to 7mm.

According to an embodiment of the present invention, the intraocular lens further comprises: the two sealing valves are symmetrically arranged relative to the central axis of the body.

An intraocular lens according to an embodiment of the present invention, the intraocular lens further comprising: a haptic body, the haptic body comprising: the front connecting arm is connected to the outer surface of the front bag body, the rear connecting arm is connected to the outer surface of the rear bag body, the free ends are formed at the end parts of the front connecting arm and the rear connecting arm, and an included angle is formed between the front connecting arm and the rear connecting arm.

According to an embodiment of the invention, the body has an equator, and the junction of the anterior capsule and the posterior capsule is spaced from the equator.

According to an embodiment of the invention, the junction of the anterior connecting arm and the anterior capsule is located at one half the thickness of the anterior capsule; the connection of the rear connecting arm and the rear bag body is positioned at one half of the thickness of the rear bag body.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of a body having a recess in a central portion of a rear side thereof in accordance with an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a front bladder having a groove in the middle thereof in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a front bladder having two sealing valves according to an embodiment of the present invention;

FIG. 4 is a schematic view of the structure of an intraocular lens according to an embodiment of the present invention with haptics attached to the equator;

FIG. 5 is a schematic illustration of the separation of the front and rear bladders according to an embodiment of the invention;

FIG. 6 is a schematic view of the configuration of the cooperation of the front and rear bladders in accordance with an embodiment of the invention;

FIG. 7 is a schematic cross-sectional view of a junction of a front bladder and a rear bladder containing a seam line in accordance with an embodiment of the invention;

fig. 8 is a schematic view of the intraocular lens according to an embodiment of the present invention in an eye.

Reference numerals:

100. An intraocular lens;

10. A body; 11. a front balloon; 12. a rear bladder; 13. a groove; 14. an equator; 15. a chamber;

20. A sealing valve;

30. A haptic body; 31. a front connecting arm; 32. a rear connecting arm; 33. a free end;

40. a seam line;

50. An optical convex lens.

Detailed Description

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

An intraocular lens 100 according to an embodiment of the present invention is described below with reference to fig. 1-8, comprising: the body 10, body 10 form nearly ellipsoid structure, and the rear side middle part of body 10 is provided with recess 13, and recess 13 is towards the sunken setting in the middle of the body 10 to can dodge the eye lens capsule back wall.

Specifically, as shown in fig. 1, the body 10 integrally forms a near-ellipsoidal structure imitating a human lens, so that imaging can be performed by a convex lens imaging principle, thereby forming a clear image on the retina. Also, the concave recess 13 is formed toward the center of the body 10 to reduce tissue contact between the intraocular lens 100 and the posterior wall of the lens capsule, thereby avoiding the effects of proliferation of foreign tissues.

As shown in fig. 1 and 5, the body 10 includes: the anterior capsule 11 and the posterior capsule 12, the anterior capsule 11 and the posterior capsule 12 are connected and form a chamber 15, an optical fluid medium can be filled in the chamber 15, and the chamber 15 can be slightly deformed by the filled optical fluid medium, so that the degree of the intraocular lens 100 can be adjusted.

Further, as the filling optical fluid medium, silicone oil, methyl silane, sterile heavy water for ophthalmic use (perfluorodecalin C10F 18), sodium hyaluronate (healon GV) and the like can be selected, and silicone oil is preferable. In the operation, the cavity 15 of the body 10 may be filled with a filler until the predetermined shape or optical path is satisfied, and the state shown in fig. 8 is formed after the operation is completed.

As shown in fig. 2, the middle part of the front capsule 11 is also provided with a groove 13. The inwardly concave spatial region of the groove 13 reduces tissue contact with the anterior wall of the lens capsule, thereby avoiding affecting the optical path. The recess 13 may be formed with an initial degree of silicone membrane which is slightly deformed by the optical fluid medium filled in the body 10, so that the degree of the entire intraocular lens 100 can be adjusted.

As shown in fig. 5, the bottom of the groove 13 of the front capsule 11 and/or the rear capsule 12 is configured as an optical convex mirror 50. The optical lens can help to adjust the light path, and can be arranged to have a convex or concave structure according to actual needs.

The optical convex mirror 50 is a PMMA film layer, and the PMMA film layer has strong light transmittance, heat resistance, and good scratch resistance, and can provide a clear light path due to the characteristics of high transparency and low refractive index of the PMMA film layer, so that the focal point can be changed by the optical characteristics of the optical convex mirror 50 and micro deformation generated by the body 10. In addition, the hardness of the optical convex lens 50 is between the shore 80A and 90A, so that the optical convex lens 50 can be prevented from being deformed in terms of mechanical properties, and the optical convex lens 50 can be ensured to have enough hardness, thereby avoiding the damage of the optical convex lens 50.

The optical lenses of the present invention may include a double convex lens and a double concave lens, or may have a structure in which one surface is a plane or concave surface and the other surface is a convex surface, or may be other structures. In addition, the present invention is not limited to a specific curvature of each lens, and an optimal design can be confirmed by optical simulation analysis.

Further, the outer radius of curvature of the optical convex mirror 50 on the front capsule 11 is ρ1, ρ1 satisfies the relation: the outer curvature radius of the optical convex mirror 50 on the rear capsule body 12 is ρ2, and ρ2 satisfies the relation: ρ2 is less than or equal to 5mm and less than or equal to 7mm.

Specifically, since the shape and characteristics of the optical convex lens 50 are affected when the outer radius of curvature of the optical convex lens 50 is changed, it is necessary to ensure that the outer radius of curvature of the optical convex lens 50 on the front capsule 11 ranges from 9mm to 11mm and the outer radius of curvature of the optical convex lens 50 on the rear capsule 12 ranges from 5mm to 7mm. Wherein the PMMA film layer of the optical convex mirror 50 at the grooves 13 of the front and rear capsules 11 and 12 is hardly deformed during filling of the optical fluid medium into the chamber 15 of the body 10. By filling different amounts of optical fluid medium into the body 10, the deformation of the body 10 can be regulated, and only by regulating the deformation of the body 10, the distance between the PMMA film layer at the groove 13 of the front capsule 11 and the PMMA film layer at the groove 13 of the rear capsule 12 can be changed, so that the optical path of the intraocular lens 100 can be regulated, and the focus change can be realized.

As shown in fig. 3, the intraocular lens 100 further includes: the two sealing valves 20 are symmetrically arranged with respect to the central axis of the body 10.

The sealing valve 20 is disposed on the front capsule 11, a valve hole is disposed on the front capsule 11, the sealing valve 20 is disposed in the valve hole, the sealing valve 20 is disposed to facilitate injection of optical fluid medium into the capsule, and the sealing valve 20 has sealing and leakage preventing capabilities.

Further, the sealing valve 20 includes: the device comprises a ring body and an injection body, wherein the ring body is arranged on the front bag body 11, the injection body is arranged in the ring body, and the hardness of the injection body is smaller than that of the ring body. In particular, the injection body is preferably circular, and the ring body is preferably a circular ring. When it is necessary to inject the optical fluid medium from the inside of the sealing valve 20, the hardness of the injection body is small, so that the injection needle can be conveniently introduced into the injection body, and sealing is more easily achieved after the injection needle is withdrawn, thereby preventing the optical fluid medium from leaking. The hardness of the ring body is high, so that deformation and stress concentration on an injection body during injection can be avoided, and the injection is simpler and more reliable.

The ring body is hard silica gel, and the injection body is soft silica gel. The soft and hard silica gel bodies can be organically combined to form a closed whole. Specifically, the hardness of the ring body is between 80A and 90A, and the hardness of the injection body is between 20A and 40A, so that the injection body can be prevented from being deformed. Further, the hardness of the injection body may be equal to or less than the hardness of the body 10. Preferably, the injection body and the body 10 are made of the same material, so that the injection body and the body are convenient to process and manufacture.

The number of the sealing valves 20 is two, and the two sealing valves 20 are symmetrically arranged with respect to the central axis of the body 10. One of the sealing valves 20 may be used for injection and the other mechanically compensating and balancing, and may also serve as a redundant valve body. Moreover, the two sealing valves 20 can form different injection paths, so that the injection can be performed in different directions, and flexible operation is facilitated. The two sealing valves 20 are symmetrically disposed with respect to the central axis of the body 10, and can uniformly deform the optical area of the upper surface of the body 10.

In addition, the intraocular lens 100 further includes: the parylene layer (not shown in the figure), the parylene layer (preferably parylene C, and may be vapor deposited) is disposed on the outer surface of the sealing valve 20, the young's modulus and hardness of the parylene layer are significantly higher than those of the sealing valve 20, and the adhesion between the parylene layer and the sealing valve 20 is better, which is equivalent to providing a reinforcing baffle outside the sealing valve 20. Therefore, after the injection needle is withdrawn, the optical fluid medium (such as silicone oil) in the sealing valve 20 can generate an outward pressure on the sealing valve 20, and the outward pressure can enable the sealing valve 20 to be self-closed under the protection of the rigid parylene layer, so that the sealing and leakage-preventing effects can be realized for a long time.

Further, the parylene layer covers the outer surface of the sealing valve 20, and the parylene layer also partially covers the outer surface of the body 10, which increases the contact area between the parylene layer and the sealing valve 20 and can avoid stress concentration at the joint of the sealing valve 20 and the body 10.

As shown in fig. 4-6, the intraocular lens 100 further includes: the haptic body 30, the haptic body 30 includes: front connecting arm 31, back connecting arm 32 and free end 33, front connecting arm 31 connects on the surface of preceding bag body 11, back connecting arm 32 connects on the surface of back bag body 12, the tip of front connecting arm 31 and back connecting arm 32 forms free end 33, and the contained angle has between front connecting arm 31 and the back connecting arm 32.

Wherein, the whole haptic body 30 is Y-shaped, and the specific connection position can be verified by mechanical simulation analysis and experiments, and the optimal stress position can be found out as the connection position of the haptic body 30. The structural design that the front connecting arm 31 and the rear connecting arm 32 have included angles can be beneficial to the balance of stress of the body 10 in refractive adjustment, and deformation controllability can also be realized, so that the accuracy and the effectiveness of refractive adjustment can be increased. Further, the haptic body 30 may be formed separately into anterior and posterior connecting arms 31 and 32, i.e., the free ends 33 are respectively anterior and posterior free ends, the anterior free ends being formed on the anterior connecting arm 31 and the posterior free ends being formed on the posterior connecting arm 32, and then the free ends 33 of the anterior and posterior connecting arms 31 and 32 are bonded with silicone or the like.

The haptic body 30 is used to support the body 10 within the lens capsule, the haptic body 30 being associated with the action of the ciliary muscle, adjusting the shape of the body 10, performing a zooming action. In addition, the haptics 30 may also be directly sutured into the wall of the eye in which the ciliary body is located for use without the lens capsule or with the lens capsule damaged. The haptics 30 may be made of polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyimide, acrylate, etc.

As shown in FIG. 4, the haptic body 30 is integrally attached to the equator 14 to facilitate shape adjustment of the body 10. The present invention may also incorporate haptic body 30 integrally formed from stainless steel molding such that anterior connecting arm 31 and posterior connecting arm 32 are integrally formed and form free end 33. The manufacturing efficiency of the intraocular lens 100 can be improved by bonding the anterior connecting arm 31 and the posterior connecting arm 32 to the anterior capsule 11 and the posterior capsule 12, respectively, using silicone rubber or the like.

The number of haptic bodies 30 is at least two, with at least two haptic bodies 30 being disposed uniformly about the center of body 10. In this way, the body 10 can be further forced uniformly, and deformation controllability can be achieved, so that accuracy and effectiveness of refractive adjustment can be increased.

As shown in fig. 6, the body 10 has an equator 14, and the junction of the front capsule 11 and the rear capsule 12 is relieved from the equator 14, i.e., the junction of the front capsule 11 and the rear capsule 12 has an area smaller than that of the equator 14. The whole body 10 is in an asymmetric ellipsoidal shape, the radial line from front to back is continuously increased, the radial line is reduced after reaching the maximum value, the middle maximum value is the equator 14, and the equator 14 is easy to generate stress concentration or slight deformation so as to influence the refraction effect, so that the connection part of the front capsule 11 and the rear capsule 12 is arranged by avoiding the equator 14, and the deformation of the body 10 can be avoided.

Further, the junction of the anterior capsule 11 and the posterior capsule 12 is disposed parallel to the equator 14. The joint of the front capsule 11 and the rear capsule 12 in the body 10 may form a seam line 40, the seam line 40 is formed into an integral ring shape, and the seam line 40 is parallel to the equator 14, so that the stress at the joint of the front capsule 11 and the rear capsule 12 is more uniform.

As shown in fig. 6, the junction of the front connecting arm 31 and the front capsule 11 is located at one half thickness of the front capsule 11; the junction of the rear attachment arm 32 and the rear bladder 12 is located one half the thickness of the rear bladder 12. Thus, the optimal stress position can be found out as the connecting position of the loop body 30 through mechanical simulation analysis and test verification.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An intraocular lens, comprising:

The body, the body forms nearly ellipsoid structure, the rear side middle part of body is provided with the recess, the recess orientation the body is middle sunken to set up, in order to dodge the ocular lens capsule back wall.

2. The intraocular lens of claim 1, wherein the body comprises: the front bag body is connected with the rear bag body to form a cavity, and the groove is formed in the middle of the rear bag body.

3. The intraocular lens of claim 2, wherein a central portion of the anterior capsule is also provided with the groove.

4. An intraocular lens according to claim 3, wherein the bottom of the groove of the anterior capsule and/or the posterior capsule is configured as an optical convex lens.

5. The intraocular lens of claim 4, wherein the optic is a PMMA film and the optic has a hardness between about 80 shore a and about 90 shore a.

6. The intraocular lens of claim 4, wherein the optical convex lens on the anterior capsule has an outer radius of curvature ρ1, ρ1 satisfying the relationship: ρ1 is more than or equal to 9mm and less than or equal to 11mm;

the outer curvature radius of the optical convex lens on the rear capsule body is ρ2, and ρ2 satisfies the relation: ρ2 is less than or equal to 5mm and less than or equal to 7mm.

7. The intraocular lens of any one of claims 2-6, further comprising: the two sealing valves are symmetrically arranged relative to the central axis of the body.

8. The intraocular lens of any one of claims 2-6, wherein the intraocular lens further comprises: a haptic body, the haptic body comprising: the front connecting arm is connected to the outer surface of the front bag body, the rear connecting arm is connected to the outer surface of the rear bag body, the free ends are formed at the end parts of the front connecting arm and the rear connecting arm, and an included angle is formed between the front connecting arm and the rear connecting arm.

9. The intraocular lens of claim 8 wherein said body has an equator, and wherein the junction of said anterior capsule and said posterior capsule is spaced from said equator.

10. The intraocular lens of claim 8, wherein the junction of the anterior connecting arm and the anterior capsule is located at one-half the thickness of the anterior capsule; the connection of the rear connecting arm and the rear bag body is positioned at one half of the thickness of the rear bag body.