Patent ID: 6409762
Filing Date: 2002-06-25
Classification: A61F

Abstract:
A monobloc intraocular lens made of a flexible material which can be folded or rolled, but which is sufficiently elastic so that the lens regains, after being implanted in an ocular housing with a mean diameter equal to &phgr;m, a functional shape corresponding to its initial shape, comprising a central optic part (1) in the shape of a disc having an optical axis (2) and defining a principal plane of the lens (3) perpendicular to the optical axis (2), and a haptic part (4) comprisingtwo loops (5) adapted to contact with an inner wall of the eye, each of these contact loops (5) having an external surface (9) with a generally convex-shaped curve with a convexity directed outwards radially with respect to the optic part (1), for each contact loop (5), two linking elements (10, 10â€²) extending between the optic part (1) and the contact loop (5), the lens having, seen in plan, and before implantation, an initially overall symmetrical shape with respect to two perpendicular axes of symmetry contained within the principal plane (3), the so-called horizontal principal axis (8) and vertical principal axis (6), the external surface (9) of each contact loop (5) having a trace in the principal plane (3) which has a generally convex-shaped curve defining an apex (S) of intersection with the horizontal principal axis (8), and two points, referred to as end points (E, Eâ€²), equidistant from the horizontal principal axis (8) between which the radius of curvature is always greater than 2.5 mm, wherein:the circle (Ca) passing through the apex (S) and the two end points (E, Eâ€²) of each contact loop (5) has a diameter &phgr;a greater than or equal to &phgr;m and less than &phgr;m+1.5 mm, the apices (S) of the two contact loops (5) are separated from each other by a distance D different from &phgr;a and greater than &phgr;a, the linking elements (10, 10â€²) are adapted so that they can be deformed in flexion in the principal plane (3) in the direction of a reduction in the radial dimensions of the lens by bringing the contact loops (5) towards each other and the optic part (1), while preserving the symmetry of the lens with respect to the two horizontal (8) and vertical (6) principal axes, and at least substantially without deformation or displacement of the optic part (1), so that the lens can be adapted to a radial retraction of the ocular housing.