Intraocular lens injector
Apparatuses, systems, and methods for implanting an intraocular lens into an eye are described. For example, an intraocular lens injector may include a passage formed in a distal end portion of the intraocular lens injector. The passage may define an interior surface, and a ramp may be formed on the interior surface so as to cause a leading haptic of an intraocular lens (IOL) being advanced through the passage to lift above a surface of an optic of the IOL to ensure proper folding of the IOL.
1. An intraocular lens (IOL) injector comprising:
an injector body comprising:
a bore defined by an interior wall;
a longitudinal axis extending centrally along the injector body;
a distal end portion comprising:
a first sidewall;
a second sidewall disposed opposite the first sidewall;
a third sidewall extending between the first sidewall and the second sidewall; and
a fourth sidewall opposite the third sidewall, the first sidewall, second sidewall, third sidewall, and fourth sidewall joined to define a passage forming a portion of the bore;
a first ramp formed on an interior surface of the passage along the first sidewall and laterally offset from the longitudinal axis, the first ramp disposed at a position within the passage to contact a leading haptic of an intraocular lens, the first ramp comprising:
a first distal leading surface being sloped and inwardly extending from the interior surface into the passage; and
a first peak disposed at a distal end of the first ramp disposed at a distal end of the distal first leading surface;
a plunger slideable in the bore;
a compartment configured to receive the IOL, wherein the IOL comprises a center optic portion and a first haptic arm and a second haptic arm on substantially opposing sides of the center optic, wherein the compartment adjoins the passage, and wherein the compartment is configured to house the IOL such that the first haptic arm is in a distal leading position with respect to the longitudinal axis followed by the center optic and the second haptic arm in a trailing position,
wherein the passage is varied in size such that the center optic of the IOL is folded when advanced through the passage by the plunger, and wherein the ramp is configured such that the first haptic arm in the distal leading position is sufficiently raised over the center optic by the ramp prior to the center beginning to fold due to the varied size of the passage.
2. The intraocular lens injector of claim 1 , wherein the first leading surface comprises a first plurality of steps therealong.
3. The intraocular lens injector of claim 2 , wherein each of the first plurality of steps comprises a rise and a run.
4. The intraocular lens injector of claim 3 , wherein the rise and run of each of the steps is uniform.
5. The intraocular lens injector of claim 3 , wherein at least one of the rise and run of at least one step of the first plurality of steps is different from the rise and the run of another of the steps of the first plurality of steps.
6. The intraocular lens injector of claim 1 further comprising a second ramp formed on the interior surface of the passage along the second sidewall and adjacent to the first ramp.
7. The intraocular lens injector of claim 6 , wherein the first ramp and the second ramp are integrally formed.
8. The intraocular lens injector of claim 6 , wherein the second ramp comprises a second leading surface, wherein the second leading surface is sloped and extends inwardly from the interior surface of the passage.
9. The intraocular lens injector of claim 8 , wherein the second ramp further comprises a second peak disposed at a distal end of the second leading surface.
10. The intraocular lens injector of 8 , wherein the second leading surface comprises a second plurality of steps.
11. The intraocular lens injector of claim 10 , wherein each of the second plurality of steps comprises a rise and a run.
12. The intraocular lens injector of claim 11 , wherein the rise and run of each of the steps is uniform.
13. The intraocular lens injector of claim 11 , wherein at least one of the rise and run of at least one step of the second plurality of steps is different from the rise and the run of another of the steps of the second plurality of steps.
14. The intraocular lens injector of claim 8 , wherein the first leading surface and the second leading surface are integrally formed.
15. The intraocular lens injector of claim 1 , wherein the first ramp further comprises a first trailing surface disposed distally of the first peak.
16. The intraocular lens injector of claim 15 , wherein further comprising a second ramp formed on the interior surface of the passage along the second sidewall and adjacent to the first ramp, wherein the second ramp comprises:
a second leading surface that is sloped and that extends inwardly from the interior surface of the passage;
a second peak disposed at a distal end of the second leading surface; and
a second trailing surface,
wherein the second trailing surface has a positive slope.
17. The intraocular lens injector of claim 16 , wherein the first trailing surface and the second trailing surface are integrally formed.
18. The intraocular lens injector of claim 1 , wherein the first trailing surface has a positive slope.