Intraocular lens insertion tool

摘要

An intraocular lens insertion tool is presented. An introductory part in an insertion cylinder is provided, at a widthwise central portion of a bottom surface, with a central protrusion which extends in an axial direction of a tool body and protrudes toward an upper surface to get in contact with a center portion of a rear surface of an optical zone of an intraocular lens. The upper surface is provided, at its both widthwise ends, with a pair of lateral protrusions, which extend in the axial direction of the tool body and protrude toward the bottom surface to get in contact with both ends of a front surface of the optical zone of the intraocular lens. A lens pressing face of a plunging member is formed with a dimension spanning from the bottom surface to the upper surface at a tip end section of the insertion cylinder.

主权项

1. An intraocular lens insertion tool comprising:
an intraocular lens; a tool body in a form of a cylinder adapted to contain the intraocular lens; a plunging member to be assembled to the tool body by being inserted therein in an axial direction from a back; a stage on which the intraocular lens is adapted to be placed provided at a middle of the tool body in the axial direction; and an insertion cylinder of tapered shape on a tip side of the stage in the axial direction, the plunging member being adapted to be plunged in order to move forward the intraocular lens placed on the stage in the axial direction so that the intraocular lens is deformed compactly and pushed out through the insertion cylinder into an eye, wherein: the stage includes a lens platform that extends in an axis-perpendicular direction of the tool body, and the intraocular lens is placed on the lens platform with a rear surface of an optical zone thereof facing the lens platform while not being folded; the insertion cylinder includes a bottom surface continuous from the lens platform of the stage, and an upper surface placed opposite the bottom surface; a central protrusion is provided at a central portion in a width direction of the tool body in the bottom surface of an introductory part on a side of the stage of the insertion cylinder so as to extend in the axial direction of the tool body and be made to protrude toward the upper surface to get in contact with a center portion of the rear surface of the optical zone of the intraocular lens sent into the insertion cylinder; a pair of lateral protrusions are provided at both ends in the width direction of the tool body in the upper surface of the introductory part so as to extend in the axial direction of the tool body and be made to protrude toward the bottom surface to get in contact with both ends of a front surface of the optical zone of the intraocular lens sent into the insertion cylinder; the plunging member has a lens pressing surface formed at a tip face thereof in the axial direction with a dimension spanning from the bottom surface to the upper surface at a tip end section of the insertion cylinder; wherein when the intraocular lens is inserted into the insertion cylinder, the central protrusion comes into contact with the center portion of the rear surface of the optical zone of the intraocular lens, while the pair of lateral protrusions come into contact with the both ends of the front surface of the optical zone of the intraocular lens so that the optical zone of the intraocular lens is subject to initial deformation in a mountain shape where the front surface of the optical zone is made convex.