Intraocular lens insertion device
There is provided an intraocular lens insertion device capable of appropriately regulating the motion of a rear supporting portion during a process of moving an intraocular lens, and reducing the possibility of reoperation being required after the intraocular lens is inserted into an eye. An intraocular lens insertion device 1 comprises a main body 2 , and a slider 3 and a plunger 4 that are attached to the main body 2 . Further, the intraocular lens insertion device 1 is of a preset type in which an intraocular lens 5 is placed inside the main body 2 in advance. The slider 3 includes a first abutting portion 21 for pushing up a supporting portion 7 (rear supporting portion 7 a ) arranged on a rear side of an optical part 6 with respect to a lens advancement axis A, and second abutting portions 22 a, 22 b abutting against an outer edge of a rear portion of the optical part 6.
1. A method performed by an intraocular lens insertion device on an intraocular lens, the intraocular lens including an optic, a forward haptic having an end and a rear haptic having an end, the insertion device including a nozzle, a transition section and a plunger having a forward region with a side wall and a bottom wall that together define an indentation and is configured to receive a portion of the rear haptic, the method comprising the steps of:
pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic;
pushing the rear haptic such that the end of the rear haptic passes over the optic, while the portion of the optic over which the rear haptic passes remains unfolded, with the forward region of the plunger in such a manner that the rear haptic is bent and a portion of the rear haptic is received in the indentation;
folding a portion of the optic such that there is a space between folded portions of the optic; and
pushing the intraocular lens through the nozzle with the forward region of the plunger while the end of the rear haptic is in the space between the folded portions of the optic.
2. A method as claimed in claim 1 , wherein
folding a portion of the optic comprises folding a portion of the optic with the transition section such that there is a space between folded portions of the optic.
3. A method as claimed in claim 1 , wherein
pushing the intraocular lens through the nozzle comprises pushing the intraocular lens through the nozzle with the forward region of the plunger while the end of the rear haptic is in the space between the folded portions of the optic and the end of the rear haptic faces in a lens travelling direction.
4. A method as claimed in claim 1 , further comprising the step of:
bending the forward haptic such that the end of the forward haptic moves into the space between the folded portions of the optic.
5. A method as claimed in claim 1 , wherein
the intraocular lens insertion device defines a lens travelling axis; and
the method further comprises the step of storing the lens in the insertion device with the optic parallel to the lens travelling axis and the rear haptic positioned at a different angle than the forward haptic relative to the lens travelling axis.
6. A method as claimed in claim 1 , wherein
the intraocular lens insertion device defines a lens travelling axis; and
pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic comprises pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic while the end of the rear haptic is on a surface that is not parallel to the lens travelling axis.
7. A method as claimed in claim 1 , wherein
the insertion device includes a slider that is movable relative to the plunger; and
pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic comprises pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic with the slider.
8. A method as claimed in claim 1 , wherein
the intraocular lens insertion device defines a lens travelling axis;
the insertion device includes a slider with an abutting portion that is slanted relative to the lens travelling axis and that is movable relative to the plunger; and
pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic comprises pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic with the abutting portion of the slider.
9. A method as claimed in claim 1 , wherein
the insertion device includes a slider that is movable relative to the plunger; and
folding a portion of the optic comprises pushing a portion of the optic into the transition section with the slider.
10. A method as claimed in claim 9 , wherein
the slider includes a pivotable lens pressing member; and
folding a portion of the optic comprises pushing a portion of the optic into the transition section while the pivotable lens pressing member engages the portion of the optic.
11. A method as claimed in claim 1 , wherein
the intraocular lens insertion device defines a lens travelling axis;
the insertion device includes a slider that is movable relative to the plunger, the slider having a first abutting portion that is slanted relative to the lens travelling axis and a pair of second abutting portions located on opposite sides of the lens travelling axis;
pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic comprises pushing the rear haptic such that the end of the rear haptic moves upwardly and forwardly relative to the optic with the first abutting portion of the slider before the second abutting portions contact the optic; and
folding a portion of the optic comprises pushing a portion of the optic into the transition section with the second abutting portions.
12. A method performed by an intraocular lens insertion device on an intraocular lens, the intraocular lens including an optic, a forward haptic having a free end and a rear haptic having a free end, the insertion device including a nozzle, a transition section and a plunger, the method comprising the steps of:
moving the free end of the rear haptic, from a position rearward of the optic, over the optic and into a space between folded portions of the optic with the plunger;
moving the free end of the forward haptic into the space between the folded portions of the optic with the transition section; and
pushing the intraocular lens with the plunger through the nozzle with the free ends of the forward and rear haptics in the space between the folded portions of the optic.
13. A method as claimed in claim 12 , wherein
the optic is folded with the transition section of the insertion device.
14. A method as claimed in claim 13 , further comprising the step of:
prior to folding the optic, pushing the rear haptic such that the free end of the rear haptic moves upwardly and forwardly relative to the optic.
15. A method as claimed in claim 14 , wherein
the insertion device includes a slider, and the plunger is movable relative to the slider; and
pushing the rear haptic such that the free end of the rear haptic moves upwardly and forwardly relative to the optic comprises pushing the rear haptic such that the free end of the rear haptic moves upwardly and forwardly relative to the optic with the slider.
16. A method as claimed in claim 13 , wherein
moving the free end of the forward haptic comprises bending the forward haptic into the space between the folded portions of the optic with an inner surface of the transition section as the intraocular lens moves toward the nozzle.