Accommodating intraocular lens
An intraocular lens includes a lens capsule expanding device and an optical portion. A front supporting portion makes contact with an inner surface of an anterior capsule. A rear supporting portion makes contact with an inner surface of a posterior capsule while facing the front supporting portion. A connecting portion connects the front supporting portion and the rear supporting portion so as to have a biasing force to separate the front supporting portion and the rear supporting portion. Due to the biasing force, the front supporting portion presses the inner surface of the anterior capsule and the rear supporting portion presses the inner surface of the posterior capsule. The optical portion changes the curvature of a central portion according to movement of the connecting portion that moves the front supporting portion and the rear supporting portion closer to or away from each other with movement of the lens capsule.
1. An accommodating intraocular lens (IOL) inserted into a lens capsule from which contents are removed during an ophthalmic surgery, comprising:
a lens capsule expanding device ( 10 ); and
an optical portion ( 20 ) arranged within the lens capsule expanding device, the optical portion comprising an anterior convex surface, a posterior convex surface, a central portion ( 21 ), and a circumferential portion ( 22 ), the optical portion being elastically deformable, the lens capsule expanding device comprising:
a front ring-shaped supporting portion ( 11 ) comprising an anterior capsular-engaging circumferential surface provided in such a manner as to make contact with an inner surface of an anterior capsule so as to pass light toward a rear side;
a rear ring-shaped supporting portion ( 12 ) comprising a posterior capsular-engaging circumferential surface provided in such a manner as to make contact with an inner surface of a posterior capsule while facing the front supporting portion so as to pass light from a front side toward a rear side; and
a circumferential connecting portion ( 13 ) placed between the front supporting portion and the rear supporting portion, the connecting portion comprising a plurality of connecting pieces ( 131 ) provided at equal intervals in the circumferential direction of the front supporting portion and the rear supporting portion and connecting an inner circumferential portion of the front supporting portion and an inner circumferential portion of the rear supporting portion in such a manner as to have biasing force in a direction of separating the front supporting portion and the rear supporting portion from each other, wherein
due to the biasing force of the connecting portion, the front supporting portion is adapted to press the inner surface of the anterior capsule and the rear supporting portion is adapted to press the inner surface of the posterior capsule,
the optical portion has a front ring member ( 30 ) provided on the anterior convex surface of the optical portion and a rear ring member ( 31 ) provided on the posterior convex surface of the optical portion in such a manner of being substantial parallel to the circumferential portion of the optical portion,
the front ring member is connected to an upper portion ( 131 a ) of the connecting portion of the lens capsule expanding device via a lateral branch ( 30 a ) and the rear ring member is connected to a lower portion ( 131 b ) of the connecting portion of the lens capsule expanding device via a lateral branch ( 31 a ), and
force is applied to the optical portion in a backward direction from the connecting portion via the front ring member and force is applied to the optical portion in a forward direction from the connecting portion via the rear ring member according to movement of the connecting portion when the front supporting portion and the rear supporting portion move in a direction away from each other with movement of the lens capsule whereby the optical portion is compressed between the front ring member and the rear ring member and the curvature of the optical portion is changed,
wherein the circumferential portion ( 22 ) of the optical portion ( 2 ) is constricted when the optical portion is compressed between the front ring member and the rear ring member,
wherein the optical portion is formed of an elastic film which can be expanded and contracted and has a predetermined thickness, and a flowable optical substance is filled in the elastic film,
wherein the elastic film of the circumferential portion ( 22 ) of the optical portion is thicker than the elastic film of the central portion ( 21 ) of the optical portion,
wherein the optical portion is formed so that the thickness of the elastic film gradually increases as it advances from the central portion toward the circumferential portion,
wherein the optical portion is formed so that a refractive index of the flowable optical substance gradually increases toward a center of the optical portion.
2. The accommodating intraocular lens according to claim 1 , wherein the elastic film of the circumferential portion of the optical portion has a thickness of 20 μm to 100 μm, the elastic film of the central portion of the optical portion has a thickness of 5 μm to 20 μm.
3. The accommodating intraocular lens according to claim 1 , wherein the optical portion has an injector for injecting the flowable substance into the optical portion.