Accommodating intraocular lens and method of manufacture thereof
View Patent ↗An accommodating IOL comprises an optic adapted to focus light toward a retina of an eye, and a movement assembly coupled to the eye to provide effective accommodating movement, preferably axial movement, of the optic. At least a portion of the movement assembly is made from a material that is less stiff and/or more resilient than the material used to make the optic. Optionally, an outer ring or support portion made at least partially from either a relatively stiff material such as the material used in the optic or a relatively resilient material such as the material used in the movement assembly is also provided.
1. An intraocular lens comprising:
an optic adapted to focus light toward a retina of an eye; and
a movement assembly coupled to the optic, at least a portion of the optic and at least a first portion of the movement assembly both being made of a first material having a first stiffness, at least a second portion of the movement assembly being made of a second material having a second stiffness, wherein the first stiffness is greater than the second stiffness;
wherein the movement assembly comprises a plurality of spaced apart plate members, each plate member including a proximal end region coupled to the optic and a distal end region extending away from the optic;
wherein the distal end regions are made at least partially of a third material which has an increased stiffness relative to the second material;
wherein the first material comprises a crosslinked acrylic polymer, and the second material comprises an acrylic hydrogel-forming polymer;
wherein the third material is a different material than the first material.
2. The intraocular lens of claim 1 which is deformable to allow passage of the intraocular lens through a small incision into an eye.
3. The intraocular lens of claim 1 which provides an increased amount of accommodating movement of the optic relative to a substantially identical intraocular lens including a movement assembly made entirely of a stiffer material than the second material.
4. The intraocular lens of claim 3 , wherein the movement assembly is configured to provide axial movement.
5. The intraocular lens of claim 4 , wherein the movement assembly is configured to provide at least about 0.5 mm of axial movement.
6. The intraocular lens of claim 1 , wherein the first polymeric material is chemically bonded to the second polymeric material.
7. The intraocular lens of claim 1 , wherein the second material has an increased water content relative to the first material.
8. The intraocular lens of claim 7 , wherein the second material comprises a polymer selected from the group consisting of poly hydroxyalkyl methacrylates, methyl methacrylate/N-vinyl pyrrolidone-containing copolymers and mixtures thereof.
9. The intraocular lens of claim 1 , wherein:
each plate member includes a hinge assembly positioned between the proximal end region and the distal end region; and
the hinge assembly is made of the second material.
10. The intraocular lens of claim 1 , wherein the third material is stiffer than the first material.
11. The intraocular lens of claim 1 , wherein the distal end region and the optic are formed partially from a same cross-linked acrylic polymeric material.
12. An intraocular lens comprising:
an optic adapted to focus light toward a retina of an eye; and
a movement assembly coupled to the optic, at least a portion of the optic and at least a first portion of the movement assembly both being made of a first material having a first stiffness, at least a second portion of the movement assembly being made of a second material having a second stiffness, wherein the first stiffness is greater than the second stiffness;
wherein the movement assembly comprises a plurality of spaced apart plate members, each plate member including a proximal end region coupled to the optic and a distal end region extending away from the optic, the movement assembly further includes an outer ring surrounding the optic and joined to the distal end regions of plate members, the outer ring being adapted to contact a capsular bag of the eye;
wherein the outer ring is made at least partially of a third material which has an increased stiffness relative to the second material.
13. The intraocular lens of claim 12 which is deformable to allow passage of the intraocular lens through a small incision into an eye.
14. The intraocular lens of claim 12 which provides an increased amount of accommodating movement of a foldable optic relative to a substantially identical intraocular lens including a movement assembly made entirely of a stiffer material than the second material.
15. The intraocular lens of claim 14 , wherein the movement assembly is configured to provide axial movement.
16. The intraocular lens of claim 15 , wherein the movement assembly is configured to provide at least about 0.5 mm of axial movement.
17. The intraocular lens of claim 12 , wherein the first material and the second material include a first polymeric material and a second polymeric material, respectively.
18. The intraocular lens of claim 17 , wherein the first and second polymeric materials are derived from monomers which are mutually compatible.
19. The intraocular lens of claim 18 , wherein the first polymeric material is chemically bonded to the second polymeric material.
20. The intraocular lens of claim 17 , wherein the first and second polymeric materials are both acrylic polymeric materials or both silicon-containing polymeric materials.
21. The intraocular lens of claim 20 , wherein:
both the first and second materials comprise silicon-containing polymeric materials; and
the first material includes more of a reinforcing component than the second material.
22. The intraocular lens of claim 12 , wherein the second material has an increased water content relative to the first material.
23. The intraocular lens of claim 22 , wherein the first material comprises a crosslinked acrylic polymer, and the second material comprises an acrylic hydrogel-forming polymer.
24. The intraocular lens of claim 22 , wherein the second material comprises a polymer selected from the group consisting of poly hydroxyalkyl methacrylates, methyl methacrylate/N-vinyl pyrrolidone-containing copolymers and mixtures thereof.
25. The intraocular lens of claim 12 , wherein:
each plate member includes a hinge assembly positioned between the proximal end region and the distal end region; and
the hinge assembly is made of the second material.
26. The intraocular lens of claim 12 , wherein the third material is at least as stiff as the first material.
27. The intraocular lens of claim 12 , wherein the distal end regions and the optic are formed at least partially from a same cross-linked acrylic polymeric material.