Accommodating intraocular lens system and method
View Patent ↗An accommodating intraocular lens is provided having optical parameters that are altered in-situ, wherein an optic portion of the lens includes an actuator that deflects a lens element to alter the optical power of the lens, responsive to forces applied to a haptic portion to the lens by contraction of the ciliary muscles. Forces applied to the haptic portion may result in fluid displacements from or to the haptic portion from the actuator. Displacement of fluid to the actuator may either increase or reduce the degree of deflection imposed on the lens element by the actuator.
1. An intraocular lens configured for implantation in a capsule following extraction of a lens, the intraocular lens being configured and adapted to accommodate in response to contraction of a patient's ciliary muscles, the intraocular lens comprising:
a substrate having a portion defining a fluid channel;
a lens element;
an actuator interposed between the lens element and the substrate and in fluid communication with the fluid channel, the actuator disposed in contact with the lens element;
a haptic having an interior volume coupled in fluid communication with the fluid channel; and
a fluid disposed in the actuator, fluid channel and the interior volume of the haptic,
wherein fluid is displaced between the interior volume of the haptic and the actuator to change a deflection of the lens element responsive to movement of the patient's ciliary muscles, and
wherein a fluid-filled space is at least partially defined by an exterior surface of the actuator and the lens element.
2. The intraocular lens of claim 1 wherein the actuator is disposed along the optical axis of the intraocular lens.
3. The intraocular lens of claim 1 wherein the fluid has a refractive index substantially the same as a refractive index of the lens element, substrate and actuator.
4. The intraocular lens of claim 1 wherein, the haptic comprises a support element that provides a predetermined arc to the haptic.
5. The intraocular lens of claim 1 further comprising a ring-shaped fulcrum disposed in contact with the lens element to enhance deflection of the lens element caused by movement of the actuator.
6. The intraocular lens of claim 1 further comprising an expansion reservoir disposed at the periphery of the intraocular lens to equalize pressure differentials within the intraocular lens arising from movement of the actuator.
7. The intraocular lens of claim 1 wherein a volume of the space fluctuates during transitioning of the intraocular lens between an accommodated state and an unaccommodated state.
8. The intraocular lens of claim 1 wherein haptic has an undeformed state and a deformed state and the interior volume of the haptic is greater in the deformed state than in the undeformed state.
9. The intraocular lens of claim 8 wherein, during transitioning to the deformed state, the haptic causes fluid to be displaced from the actuator to reduce a deflection of the lens element.
10. The intraocular lens of claim 1 wherein the haptic has an undeformed state and a deformed state and the interior volume of the haptic is smaller in the deformed state than in the undeformed state.
11. The intraocular lens of claim 10 wherein, during transitioning to the deformed state, the haptic causes fluid to be displaced to the actuator to reduce a deflection of the lens element.
12. The intraocular lens of claim 11 wherein the actuator comprises a primary actuator coupled to move in unison with a secondary actuator, the secondary actuator disposed in fluid communication with the fluid channel.
13. The intraocular lens of claim 12 wherein the haptic is coupled in fluid communication to a first reservoir, the fluid channel is coupled in fluid communication to a second reservoir, and fluid displacements in the first reservoir induce corresponding fluid displacements in the second reservoir.
14. The intraocular lens of claim 13 wherein the first and second reservoirs are disposed in a haptic portion of the intraocular lens.
15. The intraocular lens of claim 11 wherein the actuator shortens when fluid is displaced from the interior volume of the haptic to the actuator.
16. The intraocular lens of claim 1 wherein a volume of the space remains constant during transitioning of the intraocular lens between an accommodated state and an unaccommodated state.
17. The intraocular lens of claim 16 wherein a peripheral zone of the lens element deflects inward during accommodation of the intraocular lens.
18. The intraocular lens of claim 1 wherein the substrate further comprises a convex anterior surface that supports the lens element with a predetermined deflection in an unaccommodated state.
19. The intraocular lens of claim 1 further comprising a barrier coating disposed within fluid channels within the intraocular lens to reduce diffusion of the fluid into the lens element or substrate.
20. The intraocular lens of claim 1 further comprising a barrier coating disposed on the exterior of the intraocular lens to reduce diffusion of body fluids into the intraocular lens.
21. An intraocular lens comprising:
an optic portion having a lens element;
a haptic portion coupled to the optic portion;
an actuator disposed in contact with the lens element to selectively deflect the lens element and change an optical power of the intraocular lens;
a haptic having an interior volume disposed in the haptic portion, displacements of fluid within the interior volume causing corresponding displacement of fluid in the actuator;
a fluid disposed in the actuator and in the interior volume of the haptic,
wherein forces applied to the haptic displace fluid between the interior volume and the actuator to control deflection of the lens element, and
wherein a fluid-filled space is at least partially defined by an exterior surface of the actuator and the lens element.
22. The intraocular lens of claim 21 wherein the optic portion comprises optically transparent materials.
23. The intraocular lens of claim 21 wherein the lens element is an anterior lens element and the optic portion further comprises a posterior lens element.
24. The intraocular lens of claim 21 wherein the fluid has a refractive index substantially the same as a refractive index of the lens element and actuator.
25. The intraocular lens of claim 21 further comprising an expansion reservoir disposed at the periphery of the optic portion to equalize pressure differentials arising from movement of the actuator.
26. The intraocular lens of claim 21 wherein a volume of the space fluctuates during transitioning of the intraocular lens between an accommodated state and an unaccommodated state.
27. The intraocular lens of claim 21 wherein, further comprising a ring-shaped fulcrum disposed in contact with the lens element to enhance deflection of the lens element caused by movement of the actuator.
28. The intraocular lens of claim 21 wherein haptic has an undeformed state and a deformed state and the interior volume of the haptic is greater in the deformed state than in the undeformed state.
29. The intraocular lens of claim 28 wherein, during transitioning to the deformed state, the haptic causes fluid to be displaced from the actuator to reduce a deflection of the lens element.
30. The intraocular lens of claim 21 wherein haptic has an undeformed state and a deformed state and the interior volume of the haptic is smaller in the deformed state than in the undeformed state.
31. The intraocular lens of claim 30 wherein, during transitioning to the deformed state, the haptic causes fluid to be displaced to the actuator to reduce a deflection of the lens element.
32. The intraocular lens of claim 31 wherein the actuator comprises a primary actuator coupled to move in unison with a secondary actuator, the secondary actuator disposed in fluid communication with the fluid channel.
33. The intraocular lens of claim 31 wherein the haptic is coupled in fluid communication to a first reservoir, the fluid channel is coupled in fluid communication to a second reservoir, and fluid displacements in the first reservoir induce corresponding displacements in the second reservoir.
34. The intraocular lens of claim 33 wherein the first and second reservoirs are disposed in a haptic portion of the intraocular lens.
35. The intraocular lens of claim 31 , wherein the actuator shortens when fluid is displaced from the interior volume of the haptic to the actuator.
36. The intraocular lens of claim 21 wherein a volume of the space remains constant during transitioning of the intraocular lens between an accommodated state and an unaccommodated state.
37. The intraocular lens of claim 21 wherein a peripheral zone of the lens element deflects inward during accommodation of the intraocular lens.
38. The intraocular lens of claim 21 wherein the optic portion comprises a convex surface that supports the lens element with a predetermined deflection in an unaccommodated state.
39. The intraocular lens of claim 21 further comprising a barrier coating disposed within fluid channels within the intraocular lens to reduce diffusion of the fluid into the lens element or substrate.
40. The intraocular lens of claim 21 further comprising a barrier coating disposed on the exterior of the intraocular lens to reduce diffusion of body fluids into the intraocular lens.