Patent ID: 8267996
Filing Date: 2012-09-18
Classification: A61F

Abstract:
1. An intraocular lens of one-piece type comprising: an optical portion of generally circular shape in front view and including a lens zone having prescribed optical characteristics integrally formed with supporting portions that extend radially outwardly from the optical portion, the lens being configured to be inserted in an eye, and disposed to be in contact against an inside surface of an outer circumferential part of a capsule thereby holding the optical portion positioned pressed against the inside surface of the capsule on a retinal side thereof; an edge contour of edge shape extending smoothly along an entire circumference of the optical portion in a circumferential direction, the edge contour located on a posterior side of the intraocular lens, the edge contour configured to be pressed against the inside surface of the retinal side of the capsule, and the edge contour comprising an outer circumferential surface including a shoulder that constitutes an axial surface that is generally parallel to the center axis of the optical portion and extends continuously around the entire circumference of the optical portion so as to surround the optical portion; and a pair of coupling portions, which respectively spread outwardly in a diametrical direction from the outer circumferential part of the optical portion at locations situated in opposition along one direction across a diameter of the optical portion, are formed with circumferential length greater than the supporting portions, each coupling portion including an anterior surface and a posterior surface, wherein the supporting portions are formed projecting out from outer fringe parts of the coupling portions, with a thickness dimension at each outer fringe part of the coupling portion from which the supporting portion projects out being greater than a thickness dimension at an outer fringe part of the optical portion, wherein at the outer fringe part of the coupling portion in a coupling section thereof with the supporting portion, the coupling portion projects further in a posterior direction than the supporting portion so that the outer fringe parts of the optical portion and the posterior surfaces of the pair of coupling portions cooperate to form the edge contour, wherein a pair of supporting portion anterior surfaces, which constitute surfaces on an anterior side of the supporting portions in the direction of the optical axis, are positioned generally co-planar with an outer circumferential edge of the pair of coupling portion anterior surfaces, the supporting portion anterior surfaces extending further in an anterior direction of the intraocular lens than any other part of the intraocular lens, wherein a pair of supporting portion posterior surfaces, which constitute surfaces on a posterior side of the supporting portions in the direction of the optical axis, are positioned biased further towards the anterior surface side than are the pair of coupling portion posterior surfaces, wherein the shoulder is formed between the supporting portion posterior surfaces and the coupling portion posterior surfaces, wherein the supporting portions are formed so as to extend out from distal edges on outside circumferential surfaces of the coupling portions on the anterior surface side, which is biased towards an anterior surface of the optical portion, and wherein the anterior surfaces of the coupling portions are sloping surfaces which are sloped further anterior going outwardly away from the optical portion, the posterior surfaces of the coupling portions are sloping surfaces which are sloped further posterior going outwardly away from the optical portion, the anterior surfaces of the coupling portions have a larger slope angle than the posterior surfaces of the coupling portions, and the supporting portion anterior surfaces extend further in an anterior direction of the intraocular lens than any other part of the intraocular lens in an anterior region corresponding to the edge contour located on the posterior side of the intraocular lens.