Intraocular lens insertion device

Abstract

An intraocular lens insertion device having a novel configuration in such a manner that, with the displacement of a haptic toward the convex side of an optical portion, which can be deformed in a curved shape, restricted by an engaging part provided to the tip part of a plunger, the haptic is deformed in a curved shape in the direction in which the haptic approaches the optical portion. The configuration allows, when the intraocular lens is pushed out by the plunger, the haptic to enter a gap formed on the concave side of the optical portion which has been deformed in a curved shape.

1 . An intraocular lens insertion device comprising:
 a tube shaped device main unit arranged in which is set an intraocular lens having a pair of haptics projecting from an optical portion;   a plunger adapted to be inserted into the device main unit from a back side in an axial direction thereof and attached to the device main unit;   a stage arranged on which the intraocular lens is set being provided in an intermediate part of the axial direction of the device main unit; and   a tapered insertion tube part formed facing a front side in the axial direction from the stage so that the intraocular lens set on the stage is able to be inserted into an eye by being moved in an axial forward direction of the device main unit by the plunger and by being transformed to be smaller and extruded through the insertion tube part, wherein:   the intraocular lens is adapted to be set on the stage in a state with the pair of haptics in a state extending from the optical portion facing forward and backward in the axial direction of the device main unit, and by the plunger moving in the axial forward direction of the device main unit, the optical portion is deformed to a curved shape which becomes convex facing an outer peripheral side of the insertion tube part, and   a tip part of the plunger that presses the intraocular lens is provided with an optical portion pressing surface for pressing the optical portion, a haptic pressing surface for pressing the haptic extending from the optical portion in an axial backward direction of the device main unit, and an engaging part that is adapted to be engaged with the haptic pressed by the haptic pressing surface, suppressing displacement of the haptic to a side for which the optical portion is curved and deformed to be convex so as to enter the haptic into a concave side of the optical portion.   
     
     
         2 . The intraocular lens insertion device according to  claim 1 , wherein by the intraocular lens being moved forward by the plunger in the axial direction of the device main unit, the optical portion is deformed to be in a curved shape that is convex facing above or below the stage, and a pressing part is provided so that, with the intraocular lens in a state set on the stage, the pressing part pushes the haptic extending from the optical portion in the axial backward direction of the device main unit in an opposite direction from above or below the stage for which the optical portion is deformed and curved to become convex, and causes deformation and displacement in relation to the optical portion. 
     
     
         3 . The intraocular lens insertion device according to  claim 1 , wherein by the intraocular lens being moved forward by the plunger in the axial direction of the device main unit, the optical portion is deformed to a curved shape which is convex facing above or below the stage, and at the tip part of the plunger, a step surface is formed so as to project further in the axial direction at one side of above or below the stage for which the optical portion is curved and deformed to be convex than an other side, and by the haptic being engaged with the step surface, the engaging part that regulates the displacement of the haptic is constituted. 
     
     
         4 . The intraocular lens insertion device according to  claim 1 , wherein the intraocular lens set on the stage is constituted as one piece for which the pair of haptics are formed integrally with the optical portion. 
     
     
         5 . The intraocular lens insertion device according to  claim 1 , wherein provided on the device main unit is a deformation guide member that folds and deforms the optical portion in a mountain shape or valley shape for which one of above or below the stage becomes convex using a ridge line or valley line extending in a movement direction. 
     
     
         6 . The intraocular lens insertion device according to  claim 5 , wherein the deformation guide member is constituted by a deformation guide part that interferes with the intraocular lens moving within the insertion tube part and that gradually deforms the optical portion of the intraocular lens along with movement within the insertion tube part.