Insertion device for an intraocular lens
View Patent ↗In an intraocular-lens insertion device for deforming a deformable intraocular lens to a smaller size and inserting the intraocular lens into an eye via an insertion tube, the insertion tube has such an inner wall shape as to cause the deformable intraocular lens to move rotationally about an insertion tube axis by a predetermined angle in the course of axial movement.
1. An intraocular-lens insertion device comprising an insertion tube and a lens pusher for ejecting a deformable intraocular lens from said insertion tube, said insertion tube having an inner wall shaped to cause the entire deformable intraocular lens to move rotationally about an insertion tube axis by a predetermined angle in the course of axial advancing movement of the lens.
2. An intraocular-lens insertion device according to claim 1 , wherein the inner wall has an elliptical transverse cross section having major and minor axes, and the directions of the major and minor axes of the ellipse gradually rotate about the insertion tube axis toward a tip end of the insertion tube, so that the deformable intraocular lens moves rotationally about the insertion tube axis by a predetermined angle in the course of axial advancing movement of the lens.
3. An intraocular-lens insertion device according to claim 1 , wherein the inner wall of the insertion tube has a guide portion extending along the insertion tube axis, and angular position of the guide portion with respect to the insertion tube axis gradually changes toward a tip end of the insertion tube, so that the deformable intraocular lens moves rotationally about the insertion tube axis by a predetermined angle in the course of axial advancing movement of the lens.
4. An intraocular-lens insertion device according to claim 3 , wherein the guide portion is a rail which protrudes inwardly from said inner wall, said rail having a rectangular transverse cross section.
5. An intraocular-lens insertion device according to claim 3 , wherein the guide portion is a groove formed on the inner wall.
6. An intraocular-lens insertion device according to claim 5 , wherein the groove extends to an outer surface of the insertion tube.