Accommodating intraocular lens device
An accommodating intraocular lens (IOL) can be implanted either alone or as part of a two-part lens assembly. The IOL comprises an optic, a flexible membrane and a peripheral edge coupling the optic and the flexible membrane. The peripheral edge comprises an external circumferential surface having a height and a force transmitting area defined along a portion of the height of the external circumferential surface. A closed volume spaces apart the optic and the flexible membrane. The optic is axially displaced and the flexible membrane changes in curvature about a central axis when a radial compressive force is applied to the force transmitting area. A volume defined by the closed volume remains fixed when the optic is axially displaced and the flexible membrane changes in curvature and/or when the radial compressive force is applied to the force transmitting area.
1. A two-piece accommodating intraocular lens assembly comprising:
an accommodating intraocular lens (IOL) comprising:
an optic;
a flexible membrane;
a peripheral edge coupled to the optic and the flexible membrane, the peripheral edge being an outer periphery of the accommodating IOL and comprising an external circumferential surface having a force transmitting area having an annular shape along the external circumferential surface; and
a closed volume spacing apart the optic and the flexible membrane and configured to contain a fluid; and
a base lens assembly comprising a base power optic and a haptic system circumferentially around the base power optic, the haptic system having a radially-compressible outer circumference configured to engage a capsular bag of a patient's eye, and an internal surface in engaging contact with the force transmitting area of the accommodating IOL,
wherein the radially-compressible outer circumference completely surrounds the accommodating IOL and is uniformly compressible when engaged with the capsular bag;
wherein the optic of the accommodating IOL is disposed between the flexible membrane and the base power optic along a central axis,
wherein the engaging contact enables external forces exerted on the outer circumference of the haptic system to be radially transmitted to the force transmitting area of the accommodating IOL, causing the force transmitting area to be radially compressed resulting in a change in curvature of the flexible membrane, without contact between the flexible membrane and the optic, and
wherein, by virtue of pressure of the closed volume, the change in curvature of the flexible membrane causes an axial displacement of the optic further away from the base power optic.
2. The two-piece accommodating intraocular lens assembly of claim 1 , wherein only the force transmitting area of the external circumferential surface is in contact with the internal surface of the haptic system.
3. The two-piece accommodating intraocular lens assembly of claim 1 , wherein the base lens assembly further comprises supporting flanges extending radially inwardly from the internal surface to contact an anterior side of the accommodating IOL that comprises the flexible membrane.
4. The two-piece accommodating intraocular lens assembly of claim 1 , further comprising a plurality of spaced notches disposed around an external surface of the haptic system.
5. The two-piece accommodating intraocular lens assembly of claim 1 , wherein the base lens assembly further comprises a plurality of undulations in the circumferential direction between the outer circumference of the haptic system and the peripheral edge of the accommodating IOL.
6. The two-piece accommodating intraocular lens assembly of claim 1 , wherein the inner surface of the haptic system comprises a plurality of spaced-apart surfaces, and wherein the force transmitting area of the accommodating IOL is in engaging contact with the inner surface at the plurality of spaced apart surfaces and is not in contact with the inner surface between the plurality of spaced-apart surfaces.
7. The two-piece accommodating intraocular lens assembly of claim 1 , wherein the base lens assembly further comprises at least three spaced apart arms, each arm having an outer end adjacent to the internal surface and an inner end coupled with a periphery of the base power optic at spaced part locations, the inner ends of the arms being spaced apart from each other.
8. The two-piece accommodating intraocular lens assembly of claim 1 , wherein the base lens assembly further comprises a plurality of spaced apart notches disposed along the outer circumference.