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 for use with an intraocular lens, including an optic, a forward haptic having an end and a rear haptic having an end, that is located within an insertion device defining a lens travelling axis and including a nozzle, a transition section and a plunger that moves forwardly toward the nozzle and includes a forward region with a side wall and a bottom wall that together define a slot that extends rearwardly and is configured to receive a portion of the rear haptic, the method comprising the steps of:
pushing the end of the rear haptic upwardly and forwardly relative to the optic;
pushing the end of the rear haptic over the optic, while the portion of the optic over which the rear haptic passes remains unfolded, with the forward region of the plunger such that a portion of the rear haptic is bent and received in the slot that extends rearwardly;
folding 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
the insertion device includes a slider that is movable relative to the plunger; and
pushing the end of the rear haptic upwardly and forwardly comprises pushing the end of the rear haptic upwardly and forwardly relative to the optic with the slider.
3. A method as claimed in claim 1 , wherein
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 end of the rear haptic upwardly and forwardly comprises pushing the end of the rear haptic upwardly and forwardly relative to the optic with the abutting portion of the slider.
4. A method as claimed in claim 1 , wherein
folding the optic comprises folding the optic with the transition section.
5. A method as claimed in claim 1 , wherein
the insertion device includes a slider that is movable relative to the plunger; and
folding the optic comprises pushing the optic into the transition section with the slider to fold the optic.
6. A method as claimed in claim 5 , wherein
the slider includes a pivotable lens pressing member; and
folding the optic comprises pushing the optic into the transition section while the pivotable lens pressing member engages a portion of the optic to fold the optic.
7. A method as claimed in claim 1 , wherein
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 end of the rear haptic upwardly and forwardly comprises pushing the end of the rear haptic 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 the optic comprises pushing the optic into the transition section with the second abutting portions to fold the optic.
8. 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.
9. A method as claimed in claim 1 , further comprising the step of:
pushing the end of the forward haptic into the space between the folded portions of the optic.
10. A method as claimed in claim 1 , further comprising the step of:
prior to pushing the end of the rear haptic upwardly and forwardly relative to the optic, 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.
11. A method as claimed in claim 1 , wherein:
pushing the end of the rear haptic upwardly and forwardly comprises pushing the end of the rear haptic 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.
12. A method performed by an insertion device, including a nozzle, a plunger that moves forwardly toward the nozzle and a transition section and defining a lens travelling axis, on an intraocular lens including an optic, a forward haptic having an end and a rear haptic having an end, the method comprising the steps of:
folding the optic with the insertion device such that there is a space between folded portions of the optic;
moving the end of the rear haptic over the optic and into the space between the folded portions of the optic with the plunger;
moving the end of the forward haptic into the space between the folded portions of the optic with the insertion device; and
pushing the intraocular lens with the plunger through the nozzle with the 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
folding the optic comprises folding the optic with the transition section of the insertion device.
14. A method as claimed in claim 12 , wherein
the insertion device includes a slider and the plunger is movable relative to the slider; and
moving the end of the rear haptic further includes pushing the end of the rear haptic upwardly and forwardly relative to the optic with the slider.
15. A method as claimed in claim 12 , wherein
moving the end of the forward haptic comprises bending the end of 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.
16. A method as claimed in claim 12 , further comprising the step of:
prior to folding the optic such that there is a space is between folded portions of the optic, pushing the end of the rear haptic with the insertion device upwardly and forwardly relative to the optic.