Intraocular lens

Abstract

An intraocular lens. The intraocular lens comprises a body. The body is of a near-ellipsoidal structure, a recess is formed in the middle of the rear side of the body, and the recess is recessed towards the middle of the body so as to avoid the posterior wall of the eye lens capsule.

Description

intraocular lenses

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled “Intraocular Lens” filed with the State Intellectual Property Office of China on January 3, 2024, with application number 202410008100.2, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of ophthalmic medical devices, and in particular to an artificial lens. Background Art

[0004] Cataract extraction combined with intraocular lens implantation remains the only effective treatment for cataracts, and will continue to be for some time to come. While implanting a traditional monofocal intraocular lens after cataract surgery can provide excellent distance vision, the lack of focusing capability often leaves patients with hyperopia and the need to rely on glasses for various near-distance tasks.

[0005] Multifocal intraocular lenses use a unique optical design that can form two or more focal points in the eye at the same time. After surgery, patients can adjust the size of their pupils and choose different focal points to meet the needs of far and near vision, reducing the rate of cataract patients wearing glasses after surgery. However, the existence of multiple focal points at the same time will cause disadvantages such as halo and glare to patients.

[0006] In recent years, many scholars have tried to design adjustable intraocular lenses by changing the filling amount of optical fluid medium (such as silicone oil) in the capsular bag or changing the type of optical fluid medium, thereby changing the shape or optical path of the adjustable intraocular lens itself and adjusting the refractive power of the intraocular lens.

[0007] In the related art, the adjustable intraocular lens is asymmetrically ellipsoidal, which causes the problem of contact with the posterior wall tissue of the lens capsule.

[0008] Public content

[0009] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide an intraocular lens that can reduce tissue contact between the intraocular lens and the posterior wall of the lens capsule, thereby avoiding the influence of foreign tissue proliferation.

[0010] The intraocular lens according to the embodiment of the present application includes: a body, which forms a nearly ellipsoidal structure, a groove is provided in the middle of the rear side of the body, and the groove is recessed toward the middle of the body to avoid the posterior wall of the lens capsule of the eye.

[0011] Therefore, the intraocular lens can reduce the tissue contact between the intraocular lens and the posterior wall of the lens capsule, thereby avoiding the influence of foreign tissue proliferation.

[0012] According to the intraocular lens of the embodiment of the present application, the body includes: an anterior capsule and a posterior capsule, the anterior capsule and the posterior capsule are connected to form a cavity, and the groove is provided in the middle of the posterior capsule.

[0013] According to the intraocular lens of the embodiment of the present application, the groove is also provided in the middle portion of the anterior capsule.

[0014] According to the intraocular lens of the embodiment of the present application, the bottom of the groove of the anterior capsule and / or the posterior capsule is constructed as an optical convex mirror.

[0015] According to the intraocular lens of the embodiment of the present application, the optical convex lens is a PMMA film layer, and the hardness of the optical convex lens is between Shore 80A and Shore 90A.

[0016] According to the intraocular lens of the embodiment of the present application, the outer curvature radius of the optical convex mirror on the anterior capsule is ρ1, and ρ1 satisfies the relationship: 9mm≤ρ1≤11mm; the outer curvature radius of the optical convex mirror on the posterior capsule is ρ2, and ρ2 satisfies the relationship: 5mm≤ρ2≤7mm.

[0017] According to the intraocular lens of the embodiment of the present application, the intraocular lens further includes: two sealing valves, and the two sealing valves are symmetrically arranged about the central axis of the body.

[0018] According to the intraocular lens of the embodiment of the present application, the sealing valve includes: a ring body, which is arranged on the anterior capsule; and an injection body, which is arranged in the ring body, and the hardness of the injection body is less than the hardness of the ring body.

[0019] According to the intraocular lens of the embodiment of the present application, the ring body is a hard silicone body, and the injection body is a soft silicone body.

[0020] According to the intraocular lens of the embodiment of the present application, the intraocular lens further includes: a parylene layer, and the parylene layer is provided on the outer surface of the sealing valve.

[0021] According to the intraocular lens of the embodiment of the present application, the intraocular lens also includes: a loop, the loop includes: a front connecting arm, a rear connecting arm and a free end, the front connecting arm is connected to the outer surface of the front capsule, the rear connecting arm is connected to the outer surface of the rear capsule, the ends of the front connecting arm and the rear connecting arm form the free end, and there is an angle between the front connecting arm and the rear connecting arm.

[0022] According to the intraocular lens of the embodiment of the present application, the number of the haptics is at least two, and the at least two haptics are evenly arranged about the center of the body.

[0023] According to the intraocular lens of the embodiment of the present application, the body has an equator, and the connection between the anterior capsule and the posterior capsule avoids the equator.

[0024] According to the intraocular lens of the embodiment of the present application, the connection between the anterior connecting arm and the anterior capsule is located at half the thickness of the anterior capsule; the connection between the posterior connecting arm and the posterior capsule is located at half the thickness of the posterior capsule.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] FIG1 is a schematic cross-sectional view of a body having a groove in the middle portion of the rear side according to an embodiment of the present application;

[0028] FIG2 is a cross-sectional schematic diagram of a front capsule having a groove in the middle portion according to an embodiment of the present application;

[0029] FIG3 is a cross-sectional schematic diagram of a front bladder body including two sealing valves according to an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of an intraocular lens haptic connected at the equator according to an embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of the separation of the front capsule and the rear capsule according to an embodiment of the present application;

[0032] FIG6 is a schematic diagram of the structure of the front capsule and the rear capsule according to an embodiment of the present application;

[0033] FIG7 is a cross-sectional view showing a seam line at the connection between the front bladder and the rear bladder according to an embodiment of the present application;

[0034] FIG8 is a schematic diagram of the structure of an intraocular lens in an eye according to an embodiment of the present application.

[0035] Figure numerals: 100, intraocular lens; 10, body; 11, anterior capsule; 12, posterior capsule; 13, groove; 14, equator; 15, chamber; 20, sealing valve; 21, ring body; 22, injection body; 30, haptic body; 31, anterior connecting arm; 32, posterior connecting arm; 33, free end; 40, suture line; 50, optical convex lens. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present application, and the embodiments described with reference to the accompanying drawings are exemplary.

[0037] The following describes an artificial lens 100 according to an embodiment of the present application with reference to Figures 1 to 8, which includes a main body 10. The main body 10 forms a nearly ellipsoidal structure, and a groove 13 is provided in the middle of the rear side of the main body 10. The groove 13 is set toward the middle of the main body 10, so as to avoid the posterior wall of the lens capsule of the eye.

[0038] Specifically, as shown in Figure 1, the entire body 10 forms a nearly ellipsoidal structure that mimics the human lens. This allows for imaging based on the principle of convex lens imaging, resulting in a clear image on the retina. Furthermore, the recess 13 is recessed toward the center of the body 10, minimizing contact between the intraocular lens 100 and the posterior wall of the lens capsule, thereby preventing the effects of foreign tissue proliferation.

[0039] As shown in Figures 1 and 5, the main body 10 includes a front capsule 11 and a posterior capsule 12. The front capsule 11 and the posterior capsule 12 are connected to form a chamber 15. The chamber 15 can be filled with an optical fluid medium. The filled optical fluid medium can cause the chamber 15 to produce micro-deformation, thereby adjusting the degree of the artificial lens 100.

[0040] Furthermore, the optical fluid medium can be silicone oil, silane, ophthalmic sterile heavy water (perfluorodecalin C10F18), sodium hyaluronate (healon GV), etc., preferably silicone oil. During surgery, the cavity 15 of the body 10 can be filled with fillers until the desired shape or optical path is achieved. After the surgery is completed, the state shown in FIG8 is formed.

[0041] As shown in Figures 2 and 4 , a groove 13 is provided in the middle of the posterior capsule 12, and a groove 13 is also provided in the middle of the anterior capsule 11. The inwardly recessed space of groove 13 reduces contact with the tissue of the anterior lens capsule, thereby preventing interference with the optical path. A silicone film with an initial diopter can be used to form groove 13. The optical fluid medium filled within body 10 causes this silicone film to slightly deform, thereby adjusting the diopter of the entire intraocular lens 100.

[0042] As shown in Figure 5, the bottom of the groove 13 of the front capsule 11 and / or the rear capsule 12 is configured as an optical convex lens 50. The optical lens can help adjust the light path and can be configured to have a convex or concave structure according to actual needs.

[0043] The optical convex mirror 50 is a PMMA film layer, which has high light transmittance, heat resistance, and good scratch resistance. Due to the high transparency and low refractive index of the PMMA film, it provides a clear light path. The optical properties of the optical convex mirror 50 and the micro-deformation of the body 10 can achieve focal changes. Furthermore, the hardness of the optical convex mirror 50 is between 80A and 90A on the Shore Scale. This prevents deformation and ensures sufficient hardness to prevent damage.

[0044] The optical lenses referred to in this application include biconvex and biconcave lenses, and may also have a structure with one side being flat or concave and the other side being convex, or other possibilities. Furthermore, this application does not limit the specific curvature of each lens, and the optimal design can be confirmed through optical simulation analysis.

[0045] Furthermore, the outer curvature radius of the optical convex mirror 50 on the front capsule 11 is ρ1, and ρ1 satisfies the relationship: 9mm≤ρ1≤11mm; the outer curvature radius of the optical convex mirror 50 on the rear capsule 12 is ρ2, and ρ2 satisfies the relationship: 5mm≤ρ2≤7mm.

[0046] Specifically, since the change in the outer radius of curvature of the optical convex mirror 50 will affect the shape and characteristics of the optical convex mirror 50, it is necessary to ensure that the outer radius of curvature of the optical convex mirror 50 on the anterior capsule 11 is in the range of 9 mm to 11 mm, and the outer radius of curvature of the optical convex mirror 50 on the posterior capsule 12 is in the range of 5 mm to 7 mm. In the process of filling the cavity 15 of the main body 10 with the optical fluid medium, the PMMA film layer of the optical convex mirror 50 at the groove 13 of the anterior capsule 11 and the posterior capsule 12 is hardly deformed. By filling different amounts of optical fluid medium into the main body 10, the deformation of the main body 10 can be adjusted. Only by adjusting the deformation of the main body 10, the distance between the PMMA film layer at the groove 13 of the anterior capsule 11 and the PMMA film layer at the groove 13 of the posterior capsule 12 can be changed, thereby adjusting the optical path of the intraocular lens 100 and achieving a change in focus.

[0047] As shown in FIG. 3 , the intraocular lens 100 further includes two sealing valves 20 , which are symmetrically arranged about the central axis of the body 10 .

[0048] Among them, the sealing valve 20 is arranged on the front capsule 11, and a valve hole is provided on the front capsule 11. The sealing valve 20 is arranged in the valve hole. The setting of the sealing valve 20 can facilitate the injection of optical fluid medium into the main body 10. The sealing valve 20 has the function of sealing and leak-proofing.

[0049] Furthermore, the sealing valve 20 includes a ring body 21 and an injection body 22. The ring body 21 is disposed on the front capsule 11, and the injection body 22 is disposed within the ring body 21. The hardness of the injection body 22 is less than that of the ring body 21. Specifically, the injection body 22 is preferably circular, and the ring body 21 is preferably a ring. When an optical fluid medium needs to be injected from the sealing valve 20, the low hardness of the injection body 22 facilitates the entry of the injection needle into the injection body 22. After the injection needle is withdrawn, sealing is more easily achieved to prevent leakage of the optical fluid medium. The high hardness of the ring body 21 can avoid deformation and stress concentration on the injection body 22 during injection, making injection simpler and more reliable.

[0050] Furthermore, the ring body 21 is made of hard silicone, while the injection body 22 is made of soft silicone. The organic combination of the soft and hard silicones forms a closed, integrated whole. Specifically, the hardness of the ring body 21 is between 80A and 90A on the Shore Scale, while the hardness of the injection body 22 is between 20A and 40A on the Shore Scale, which prevents deformation of the injection body 22. Furthermore, the hardness of the injection body 22 can be equal to or less than that of the main body 10. The injection body 22 and the main body 10 are preferably made of the same material for ease of processing and manufacturing.

[0051] There are two sealing valves 20, symmetrically arranged about the central axis of the main body 10. One of the sealing valves 20 can be used for injection, while the other serves a mechanical compensation and balancing function, and can also serve as a backup valve body. Furthermore, the two sealing valves 20 can form different injection paths, allowing injection in different directions for flexible operation. The symmetrical arrangement of the two sealing valves 20 about the central axis of the main body 10 can produce uniform deformation in the optical area of ​​the upper surface of the main body 10.

[0052] In addition, intraocular lens 100 includes a parylene layer (not shown). This parylene layer (preferably parylene C, which can be vapor-deposited) is deposited on the outer surface of sealing valve 20. The parylene layer has a significantly higher Young's modulus and hardness than sealing valve 20. Furthermore, the parylene layer adheres well to sealing valve 20, effectively creating a reinforcing barrier around the outer surface of sealing valve 20. Therefore, when the injection needle is withdrawn, the optical fluid (e.g., silicone oil) within sealing valve 20 exerts outward pressure on the sealing valve 20. This outward pressure causes the sealing valve 20 to self-seal under the protection of the rigid parylene layer, thereby providing a long-term leak-proof seal.

[0053] Furthermore, 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, thereby increasing the contact area between the parylene layer and the sealing valve 20 and avoiding stress concentration at the connection between the sealing valve 20 and the body 10.

[0054] As shown in Figures 4 to 6, the intraocular lens 100 also includes a loop 30, which includes a front connecting arm 31, a rear connecting arm 32 and a free end 33. The front connecting arm 31 is connected to the outer surface of the anterior capsule 11, and the rear connecting arm 32 is connected to the outer surface of the posterior capsule 12. The ends of the front connecting arm 31 and the rear connecting arm 32 form a free end 33, and there is an angle between the front connecting arm 31 and the rear connecting arm 32.

[0055] The haptic 30 is Y-shaped as a whole. The specific connection position can be verified through mechanical simulation analysis and experiments, and the optimal force-bearing position can be found as the connection position of the haptic 30. The front connecting arm 31 and the rear connecting arm 32 have an angled structural design, which can facilitate the balanced force on the main body 10 during refractive adjustment and can also achieve controllable deformation, thereby increasing the accuracy and effectiveness of refractive adjustment. Furthermore, the haptic 30 can be manufactured by dividing it into a front connecting arm 31 and a rear connecting arm 32, that is, the free ends 33 are respectively a front free end and a rear free end, the front free end is formed on the front connecting arm 31, and the rear free end is formed on the rear connecting arm 32. Then, the free ends 33 of the front connecting arm 31 and the rear connecting arm 32 are bonded together using silicone or the like.

[0056] Haptic 30 supports the main body 10 within the lens capsule. Linked to the movement of the ciliary muscles, haptic 30 adjusts the shape of the main body 10, enabling zooming. Alternatively, haptic 30 can be sutured directly into the eye wall where the ciliary body resides, for use in situations where the lens capsule is not present or is damaged. Haptic 30 can be made of polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyimide, or acrylate.

[0057] As shown in FIG5 , the haptic 30 is integrally formed and connected to the equator 14, facilitating adjustment of the shape of the main body 10. Alternatively, the haptic 30 may be integrally formed using a stainless steel mold, with the anterior connecting arm 31 and the posterior connecting arm 32 integrally formed to form a free end 33. By using silicone or the like to bond the anterior connecting arm 31 and the posterior connecting arm 32 to the anterior capsule 11 and the posterior capsule 12, respectively, the efficiency of manufacturing the intraocular lens 100 can be improved.

[0058] There are at least two haptics 30, and at least two haptics 30 are evenly arranged about the center of the body 10. In this way, the body 10 can be further subjected to uniform force and its deformation can be controlled, thereby increasing the accuracy and effectiveness of diopter adjustment.

[0059] As shown in Figure 6, the body 10 has an equator 14. The junction of the anterior capsule 11 and the posterior capsule 12 avoids the equator 14, that is, the area of ​​the junction of the anterior capsule 11 and the posterior capsule 12 is smaller than the area of ​​the equator 14. The body 10 has an asymmetric ellipsoidal shape, with the diameter increasing from front to back, reaching a maximum value, and then decreasing backward. This maximum value in the middle is the equator 14. Because the location of the equator 14 is prone to stress concentration or slight deformation, which can affect the refractive effect, the junction of the anterior capsule 11 and the posterior capsule 12 avoids the equator 14 to prevent deformation of the body 10.

[0060] Furthermore, the connection between the front and rear capsules 11 and 12 is arranged parallel to the equator 14. A seam line 40 can be formed at the connection between the front and rear capsules 11 and 12 in the body 10. The seam line 40 forms an integral ring. The seam line 40 is arranged parallel to the equator 14, which can make the force at the connection between the front and rear capsules 11 and 12 more uniform.

[0061] As shown in Figure 6, the connection between the front connecting arm 31 and the front capsule 11 is located at half the thickness of the front capsule 11, and the connection between the rear connecting arm 32 and the rear capsule 12 is located at half the thickness of the rear capsule 12. Thus, through mechanical simulation analysis and experimental verification, the optimal force-bearing position can be found as the connection position of the haptic 30.

[0062] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An intraocular lens (100), characterized in that, Comprising: A body (10), the body (10) forming a near-ellipsoidal structure, a groove (13) being provided in the middle of the rear side of the body (10), the groove (13) being recessed towards the middle of the body (10) to avoid the posterior wall of the eye lens capsule.

2. The intraocular lens (100) according to claim 1, characterized in that, The body (10) includes an anterior capsule (11) and a posterior capsule (12), the anterior capsule (11) and the posterior capsule (12) being connected to form a chamber (15), and the groove (13) being provided in the middle of the posterior capsule (12).

3. The intraocular lens (100) according to claim 2, characterized in that, The groove (13) is also provided in the middle of the anterior capsule (11).

4. The intraocular lens (100) according to claim 3, characterized in that, The bottom of the groove (13) of the anterior capsule (11) and / or the posterior capsule (12) is configured as an optical convex lens (50).

5. The intraocular lens (100) according to claim 4, characterized in that, The optical convex lens (50) is a PMMA film layer, and the hardness of the optical convex lens (50) is between Shore 80A - 90A.

6. The intraocular lens (100) according to claim 4 or 5, characterized in that, The outer curvature radius of the optical convex lens (50) on the anterior capsule (11) is ρ1, and ρ1 satisfies the relation: 9mm ≤ ρ1 ≤ 11mm; The outer curvature radius of the optical convex lens (50) on the posterior capsule (12) is ρ2, and ρ2 satisfies the relation: 5mm ≤ ρ2 ≤ 7mm.

7. The intraocular lens (100) according to any one of claims 2-6, characterized in that, Also comprising: Two sealing valves (20), the two sealing valves (20) being symmetrically arranged about the central axis of the body (10).

8. The intraocular lens (100) according to claim 7, characterized in that, The sealing valve (20) includes: A ring body (21), the ring body (21) being provided on the anterior capsule (11); and An injection body (22), the injection body (22) being provided in the ring body (21), and the hardness of the injection body (22) being less than the hardness of the ring body (21).

9. The intraocular lens (100) according to claim 8, wherein, The ring body (21) is a hard silicone body, and the injection body (22) is a soft silicone body.

10. The intraocular lens (100) according to any one of claims 7-9, characterized in that, The intraocular lens (100) further includes: a parylene layer, the parylene layer being provided on the outer surface of the sealing valve (20).

11. The intraocular lens (100) according to any one of claims 2-10, characterized in that, The intraocular lens (100) further includes: a haptic (30), the haptic (30) including a front connecting arm (31), a rear connecting arm (32) and a free end (33), the front connecting arm (31) being connected to the outer surface of the anterior capsule (11), the rear connecting arm (32) being connected to the outer surface of the posterior capsule (12), the ends of the front connecting arm (31) and the rear connecting arm (32) forming the free end (33), and there being an angle between the front connecting arm (31) and the rear connecting arm (32).

12. The intraocular lens (100) according to claim 11, characterized in that, The number of the haptics (30) is at least two, and at least two haptics (30) are evenly arranged about the center of the body (10).

13. The intraocular lens (100) according to claim 11 or 12, characterized in that, The body (10) has an equator (14), and the connection between the anterior capsule (11) and the posterior capsule (12) avoids the equator (14).

14. The intraocular lens (100) according to any one of claims 11-13, characterized in that, The connection between the front connecting arm (31) and the anterior capsule (11) is located at half the thickness of the anterior capsule (11); the connection between the rear connecting arm (32) and the posterior capsule (12) is located at half the thickness of the posterior capsule (12).

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