Accommodating intraocular lens system having circumferential haptic support and method
View Patent ↗An accommodating intraocular lens includes an optic portion a haptic portion and a backstop. The 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 the haptic portion of 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. The backstop provides support to the haptic so that bulk translation of the haptic is prevented in response to the forces applied by the capsular sac.
1. An intraocular lens comprising:
an optic portion including a lens element configured to be deflected between an accommodated configuration and an unaccommodated configuration, wherein the optic portion includes an optical axis extending in an anterior to posterior direction; and
a haptic having an interior volume filled with a fluid, wherein the haptic is in fluid communication with the optic portion,
wherein the haptic is configured such that movement of the capsular sac changes the interior volume of the haptic and wherein a first portion of the haptic is adapted to engage the capsular sac, wherein the haptic, at a location in the first portion, has a cross-sectional configuration in a non-stressed configuration in a plane extending in the anterior to posterior direction in which a maximum linear anterior-to-posterior dimension between any two points on an outer surface of the haptic is greater than a maximum linear radial dimension between any two points on an outer surface of the haptic, and
wherein the lens element is configured to change curvature in response to changes in the interior volume of the haptic such that it transitions between the accommodated state and the unaccommodated state.
2. The intraocular lens of claim 1 wherein the haptic is a first haptic, the intraocular lens further comprising a second haptic with an interior volume filled with the fluid, the second haptic is in fluid communication with the optic portion.
3. The intraocular lens of claim 1 wherein the fluid is adapted to be moved between the haptic and the optic portion in response to changes in the interior volume of the haptic.
4. The intraocular lens of claim 1 wherein the cross sectional configuration is an oval.
5. The intraocular lens of claim 1 wherein the volume of fluid in the haptic is larger when the optic is in an unaccommodated configuration than when the optic is in an accommodated configuration.
6. The intraocular lens of claim 1 wherein an anterior-most portion of the haptic extends further in the anterior direction than an anterior-most portion of the optic portion.
7. The intraocular lens of claim 1 wherein the optic portion includes an actuator layer in between an anterior layer and a posterior layer.
8. The intraocular lens of claim 1 wherein the haptic has a radially inner portion that is less flexible than a radially outer portion.
9. An intraocular lens comprising:
an optic portion including a lens element configured to be deflected to change the power of the intraocular lens, wherein the optic portion includes an optical axis extending in an anterior to posterior direction; and
a haptic having an interior volume with a fluid therein, wherein the interior volume is in fluid communication with the optic portion,
wherein the haptic is configured such that movement of the capsular sac changes the interior volume of the haptic and wherein a first portion of the haptic is adapted to engage the capsular sac, wherein the haptic, at a location in the first portion, has a cross-sectional configuration in a non-stressed configuration in a plane extending in the anterior to posterior direction in which a maximum linear anterior-to-posterior dimension between any two points on an outer surface on the haptic is greater than a maximum linear radial dimension between any two points on an outer surface of the haptic,
wherein the lens element is configured to change curvature in response to changes in the interior volume of the haptic such that it transitions between the accommodated state and the unaccommodated state, and
wherein the haptic has a radially inner portion that is less flexible than a radially outer portion.