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; and
a movement assembly coupled to the optic and adapted to cooperate with the eye to provide effective accommodating movement of the optic in response to action of the eye, at least a portion of the movement assembly being made of a second material that is more resilient than the first material,
wherein the movement assembly comprises a pair of opposing fixation members and a pair of opposing enlarged support portions at distal portions of the pair of opposing fixation members, the pair of opposing enlarged support portions adapted to contact a capsular bag of the eye,
wherein each fixation member of the pair of opposing fixation members decreases in width from a proximal end coupled to the optic to an intermediate portion, and increases in width from the intermediate portion to the distal portion, and
wherein, for each fixation member, a hinge having a thickness less than the proximal portion and the distal portion is provided at a narrowest section of the intermediate portion.
2. 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.
3. The intraocular lens of claim 2 , wherein the first and second polymeric materials are derived from monomers which are mutually compatible.
4. The intraocular lens of claim 3 , wherein the first polymeric material is chemically bonded to the second polymeric material.
5. The intraocular lens of claim 2 , wherein the first and second polymeric materials are both acrylic polymeric materials.
6. The intraocular lens of claim 1 , wherein the second material has an increased water content relative to the first material.
7. The intraocular lens of claim 6 , wherein the first material comprises a cross-linked acrylic polymer, and the second material comprises an acrylic hydrogel-forming polymer.
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 the movement assembly at least partially circumscribes the optic.
10. The intraocular lens of claim 1 , wherein at least one of the first and second materials is a silicon-containing polymeric material.
11. The intraocular lens of claim 1 , wherein each fixation member of the pair of opposing fixation members is hour-glass shaped.
12. The intraocular lens of claim 11 , wherein each enlarged support portion of the pair of enlarged support portions is crescent-shaped.
13. The intraocular lens of claim 12 , wherein each enlarged support portion of the pair of enlarged support portions tapers from a proximal end having a first width at the distal portion of the fixation member to a distal end having a second width less than the first width.
14. The intraocular lens of claim 1 , wherein the first material comprises a first silicon-containing polymeric material and the second material comprises a second silicon-containing polymeric material that is less stiff than the first silicon-containing polymeric material.