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, at least a portion of the optic being made of a first material having a first stiffness; and
a movement assembly coupled to the optic and adapted to cooperate with the eye to provide accommodating movement of the optic, wherein the movement assembly is comprised of a capsular bag support ring with a plurality of members coupled to the capsular bag support ring, the members having substantial voids therebetween, wherein each member has a hinge portion that is located between the ring and the optic and that has a reduced thickness relative to a portion of the member located adjacent the hinge portion and between the hinge portion and the ring, and relative to a portion of the member located adjacent the hinge portion and between the hinge portion and the optic, wherein each member includes a proximal end region coupled to the optic and a distal end region coupled to the ring, wherein at least a portion of the movement assembly is made of a second material having a second stiffness; and
wherein the first stiffness is greater than the second stiffness,
wherein the ring is made at least partially of a third material, where the third material has a third stiffness that is greater than the first stiffness.
2. The intraocular lens of claim 1 which is deformable to allow passage of the intraocular lens through a small incision into the 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 accommodating movement is axial movement.
5. The intraocular lens of claim 1 , wherein the movement assembly is configured to provide at least 0.5 mm of axial movement.
6. The intraocular lens of claim 1 , wherein the first material and the second material include a first polymeric material and a second polymeric material, respectively.
7. The intraocular lens of claim 6 , wherein the first and second polymeric materials are derived from monomers which are mutually compatible.
8. The intraocular lens of claim 7 , wherein the first polymeric material is chemically bonded to the second polymeric material.
9. The intraocular lens of claim 6 , wherein the first and second polymeric materials are both acrylic polymeric materials or both silicon-containing polymeric materials.
10. The intraocular lens of claim 9 , 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.
11. The intraocular lens of claim 6 , wherein the first and second polymeric materials are both acrylic polymeric materials.
12. The intraocular lens of claim 6 , wherein the second material has an increased water content relative to the first material.
13. The intraocular lens of claim 12 , wherein the first material comprises a cross-linked acrylic polymer, and the second material comprises an acrylic hydrogel-forming polymer.
14. The intraocular lens of claim 13 , 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.
15. The intraocular lens of claim 1 , wherein the second material has an increased water content relative to the first material.
16. The intraocular lens of claim 15 , 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.
17. The intraocular lens of claim 1 , wherein the ring is made at least partially of the third material which has an increased stiffness relative to the second material.
18. The intraocular lens of claim 1 , wherein the hinge portion of each member is made of the second material.
19. The intraocular lens of claim 1 , wherein the first, second and third materials comprise first, second and third polymeric materials, respectively.
20. The intraocular lens of claim 19 , wherein the third material comprises an acrylic polymeric material.
21. The intraocular lens of claim 20 , wherein at least one of the first and second materials comprises an acrylic polymeric material.
22. The intraocular lens of claim 1 , wherein at least one of the first and second materials is a silicon-containing polymeric material.
23. The intraocular lens of claim 1 , wherein the first material comprises a cross-linked acrylic polymeric material and wherein the second material comprises a silicon containing polymeric material.
24. The intraocular lens of claim 1 , wherein each member extends radially outward from the optic.
25. The intraocular lens of claim 1 , wherein the hinge portion of each member has a reduced thickness relative to the remainder of the respective member.
26. The intraocular lens of claim 1 , wherein each member has a proximal end coupled to the optic, and a distal end coupled to the ring, the hinge portion being located between the proximal end and the distal end.
27. The intraocular lens of claim 1 , wherein the members are oriented in a tripod configuration.