Intraocular lens insertion device and method for controlling movement of the intraocular lens
Provided is an intraocular lens insertion device capable of omitting a repeated operation after the intraocular lens is inserted into the eye. The intraocular lens insertion device ( 1 ) comprises a lens setting part ( 11 ) for mounting an intraocular lens ( 5 ) having an optic ( 6 ) and one or two or more supporting portions ( 7 a and 7 b ) disposed at the outer edge of the optic ( 6 ), a plunger ( 4 ) for pushing out the intraocular lens ( 5 ) mounted in the lens setting part ( 11 ), and a nozzle ( 13 ) for releasing the intraocular lens ( 5 ) pushed out by the plunger ( 4 ). This plunger ( 4 ) includes a lens contact portion ( 32 ) for abutting against the outer edge of the optic ( 6 ), and a pushing portion ( 33 ) for pushing out the supporting portion ( 7 b ) arranged in the backward direction of a lens advancing axis (A).
1. A method of operating an insertion device including a main body, a nozzle, and a tapered transition portion proximal of the nozzle, the method comprising the steps of:
applying force to an intraocular lens, located within the main body and having an optic, a leading loop haptic with a fixed end at the optic and a free end, and a trailing loop haptic with a fixed end at the optic and a free end, with a plunger, including a distal portion with a lens contact surface and a slot that extends proximally from the lens contact surface, in such a manner that a portion of the trailing loop haptic is located within the slot while being bent toward the nozzle by the distal portion and the free end of the trailing loop haptic points toward the nozzle; and
pushing the intraocular lens into the nozzle with the plunger.
2. A method as claimed in claim 1 , wherein
the trailing loop haptic is in an unbent state prior to force being applied with the plunger.
3. A method as claimed in claim 1 , wherein
the main body and nozzle of the insertion device define a lens advancing axis; and
the free end of the trailing loop haptic is located on the lens advancing axis when pointing toward the nozzle.
4. A method as claimed in claim 1 , wherein
the main body and nozzle of the insertion device define a lens advancing axis; and
the distal portion with the lens contact surface and the slot has an outer surface that defines a non-circular shape in a cross-section that is perpendicular to the lens advancing axis.
5. A method as claimed in claim 1 , wherein
the trailing and leading loop haptics comprise filament shaped loop haptics.
6. A method as claimed in claim 1 , wherein
the trailing and leading loop haptics comprise thin plate loop haptics.
7. A method as claimed in claim 1 , wherein
the distal portion of the plunger includes a scoop projecting from the lens contact surface.
8. A method as claimed in claim 1 , further comprising the step of:
folding the optic prior to applying force to the intraocular lens with a plunger.
9. A method as claimed in claim 8 , wherein
the main body and nozzle of the insertion device are part of a cartridge;
the method further comprises the step of placing the intraocular lens with the folded optic into the cartridge prior to applying force to the intraocular lens with a plunger.
10. A method as claimed in claim 1 , wherein
the main body and nozzle of the insertion device define a lens advancing axis; and
the slot comprises an elongate slot that is located on the lens advancing axis.
11. A method as claimed in claim 1 , wherein
at least a portion of the trailing haptic is bent into a U-shape when the trailing loop haptic is located within the slot and the free end of the trailing loop haptic points toward the nozzle.
12. A method of operating an insertion device including a main body and a nozzle, the method comprising the step of:
applying force to an intraocular lens, located within the main body and having an optic, a leading loop haptic with a fixed end at the optic and a free end, and a trailing loop haptic with a fixed end at the optic and a free end, with a plunger, including a distal portion with a lens contact surface and an elongate slot that extends proximally from the lens contact surface, in such a manner that a portion of the trailing loop haptic is located within the elongate slot while being bent toward the nozzle by the distal portion and the free end of the trailing loop haptic points toward the nozzle prior to the lens contact surface contacting the optic.
13. A method as claimed in claim 12 , further comprising the step of:
engaging the optic with the lens contact surface after the trailing loop haptic is located within the elongate slot and the free end of the trailing loop haptic points toward the nozzle.