Intraocular lens insertion instrument

Abstract

To improve operability in an intraocular lens insertion instrument that can be used both by a rotation operation method and a pressure operation method.SOLUTION: An intraocular lens insertion instrument includes a cylindrical body 12, an extrusion member 50 for extruding an intraocular lens from a lens installation part 26 by moving the inside of the cylindrical body 12 in an axial direction, a pressing member 60 for pressing the extrusion member 50 along an axial direction, and a mechanical transmission mechanism for converting the drive by rotation operation R of a rotation member 70 into a linear movement. The intraocular lens insertion instrument can achieve both first operation for extruding the intraocular lens by moving the extrusion member 50 forward by rotation operation of the rotation member 70 in the mechanical transmission mechanism and second operation for extruding the intraocular lens by moving the extrusion member 50 forward by pressing operation of the pressing member 60. The rotation member 70 in the mechanical transmission mechanism is disposed more on a tip end side than a flange part 16 that protrudes from the external surface of the cylindrical body 12 to hook the fingers of a user.SELECTED DRAWING: Figure 2

Claims

1. A cylindrical body having a lens mounting portion in which an intraocular lens is mounted; a push-out member that moves inside the cylindrical body in an axial direction of the cylindrical body to push out the intraocular lens from the lens placement portion; a pressing member that presses the push-out member along an axial direction to allow the push-out member to move in the axial direction; a mechanical transmission mechanism for converting a drive force generated by a rotation operation of the rotating member into a linear movement; a first operation in which the push-out member is moved forward by a rotation operation of the rotating member in the mechanical transmission mechanism, thereby being capable of pushing out the intraocular lens; a first operation in which the pushing member is pushed forward by a pressing operation of the pressing member, and a second operation in which the intraocular lens can be pushed out by the pushing member being moved forward; The rotating member in the mechanical transmission mechanism is disposed distal to a flange portion that protrudes from the outer surface of the cylindrical body and is adapted to hook the fingers of a user.

2. 2. The intraocular lens insertion device according to claim 1, The pushing member and the pressing member are separate, During the first operation, the pusher member is moved forward independently of the pressing member by the driving force of the mechanical transmission mechanism.

3. 2. The intraocular lens insertion device according to claim 1, The intraocular lens insertion device, wherein the rotating member is disposed between the lens setting portion and the flange portion and at a position spaced apart from the flange portion.

4. The intraocular lens insertion device according to any one of claims 1 to 3, The mechanical transmission mechanism includes: The rotating member rotates about a rotation axis perpendicular to the axial movement of the pushing member, a gear mechanism that is rotated by being driven by a rotation operation of the rotating member; a rack portion having teeth cut on a flat rod, the rack portion being integral with the extrusion member; The intraocular lens insertion device is configured such that the drive force generated by the rotational operation of the rotating member is transmitted to the rack portion via the gear mechanism, thereby converting the movement of the pusher member into linear motion.

5. 5. The intraocular lens insertion device according to claim 4, the mechanical transmission mechanism is configured with a gear having a missing tooth region where some teeth are not formed, The operation of the mechanical transmission mechanism is disabled by the missing tooth area of ​​the missing tooth gear, and the pushing member is pressed by the pressing member, thereby enabling the pushing member to move axially to a surgery waiting position immediately before pushing out the intraocular lens from the lens setting portion.

6. 6. The intraocular lens insertion device according to claim 5, The mechanical transmission mechanism includes a rotation restricting mechanism that restricts the rotation of the rotating member up to the surgery standby position.

7. 7. The intraocular lens insertion device according to claim 6, An intraocular lens insertion device, wherein at least one of the gear mechanisms is configured as a two-stage gear, and the gear ratio of the two-stage gear is set so that the linear movement of the push-out member is greater than the rotational movement of the rotating member.

8. 2. The intraocular lens insertion device according to claim 1, The mechanical transmission mechanism includes: the rotating member is formed with a first thread portion and is attached to the cylindrical body so as to be rotatable about an axis of the cylindrical body; The extrusion member is formed with a second screw portion that screws into the first screw portion, An intraocular lens insertion device configured to convert drive generated by rotation of the rotating member into linear movement.

9. The intraocular lens insertion device according to any one of claims 1 to 3 or 8, an intraocular lens insertion device having an idling release mechanism that prevents the rotating member in the mechanical transmission mechanism from idling due to the operating force of the pressing operation of the pressing member during the second operation;

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