Intraocular lens insertion device
An intraocular lens insertion device capable of folding an intraocular lens into a predetermined shape without giving a local stress to the intraocular lens. The intraocular lens insertion device 2 may include a lens disposing part 15 for disposing an intraocular lens 4 , a slider 7 for pushing out the intraocular lens 4 , a plunger 8 for further pushing out the intraocular lens pushed out by the slider 7 , a transition part 31 for deforming the intraocular lens 4 pushed out by the slider and the plunger, and a nozzle 32 for ejecting out the deformed intraocular lens 4.
1. An insertion method for use with an insertion device having a nozzle that is configured to be inserted into an eye, the method comprising the steps of:
pushing an unfolded intraocular lens, having a lens optic with a geometric center and a lens outer edge, in a first direction relative to the nozzle and toward the nozzle by initially abutting the lens outer edge without initially engaging the geometric center of the lens optic;
moving diametrically opposed portions of the lens outer edge in a second direction transverse to the first direction as the intraocular lens is being pushed in the first direction; and
during the moving step, folding the intraocular lens by preventing a portion of the lens optic located between the diametrically opposed portions of the lens outer edge from moving in the second direction by moving a lens holder into contact with the lens optic.
2. An insertion method as claimed in claim 1 , wherein the step of pushing an unfolded intraocular lens comprises pushing the unfolded intraocular lens along a lens travelling axis with a slider that is in direct contact with a point on the lens outer edge that is aligned with the lens traveling axis.
3. An insertion method as claimed in claim 2 , further comprising the steps of:
ending pushing of the intraocular lens with the slider; and
after ending pushing of the intraocular lens with the slider, pushing the folded intraocular lens away from the slider with a plunger that is movable relative to the slider.
4. An insertion method as claimed in claim 1 , wherein the step of moving diametrically opposed portions of the lens outer edge comprises:
positioning the diametrically opposed portions of the lens outer edge on first and second rails, with a gap therebetween, that extend in the second direction; and
pushing the intraocular lens along the first and second rails.
5. An insertion method as claimed in claim 1 , wherein the step of folding the intraocular lens comprises pivoting the lens holder about a hinge into contact with the portion of the lens optic located between the diametrically opposed portions of the lens outer edge.
6. An insertion method, comprising the step of:
folding an unfolded intraocular lens having a lens optic with diametrically opposed portions, as it is pushed in a first direction through an insertion device, by moving diametrically opposed portions of the lens optic in a second direction that is transverse to the first direction while pivoting a lens holder, that was out of contact with a portion of the lens optic located between the diametrically opposed portions, into contact with the portion of the lens located between the diametrically opposed portions while the lens is being pushed to prevent the portion of the lens located between the diametrically opposed portions from moving in the second direction.
7. An insertion method as claimed in claim 6 , wherein the lens optic includes a proximal edge, the method further comprising the step of:
pushing the unfolded intraocular lens in the first direction with a slider that includes the lens holder, a hinge about which the lens holder pivots, and a push-out part that is adjacent to the hinge and abuts the proximal edge of the lens optic.
8. An insertion method as claimed in claim 7 , further comprising the step of:
pushing the folded intraocular lens in the first direction with a plunger.
9. An insertion method as claimed in claim 7 , further comprising the step of:
pushing the folded intraocular lens in the first direction with a plunger that is movable relative to the slider.
10. An insertion method as claimed in claim 6 , further comprising the step of:
pushing the folded intraocular lens in the first direction with a plunger.
11. An insertion method as claimed in claim 6 , wherein
the diametrically opposed portions of the lens optic comprise diametrically opposed portions of an outer edge of the lens optic.
12. An insertion method as claimed in claim 6 , further comprising the step of:
pushing the unfolded intraocular lens out of a lens storage region and in the first direction prior to the folding step.
13. An insertion method as claimed in claim 6 , wherein
moving the diametrically opposed portions of the lens optic in a second direction that is transverse to the first direction comprises moving the intraocular lens while supporting the diametrically opposed portions of the lens optic on spaced first and second rails that extend in a direction generally transverse to the first direction.
14. An insertion method as claimed in claim 6 , wherein
pivoting a lens holder comprises pivoting the lens holder about a hinge with a tapered surface.
15. An insertion method as claimed in claim 6 , further comprising the step of:
additionally folding the folded intraocular lens with a tapered lumen.
16. An insertion method as claimed in claim 6 , wherein
the portion of the lens optic located between the diametrically opposed portions comprises the geometric center of the lens optic.