Plunger needle for an intraocular lens injector
View Patent ↗A plunger needle ( 3 ) for an intraocular lens injector has a plunger tip ( 4 ) with a contact area for making contact with a lens (L), the contact area being arranged in a front face ( 40 ) of the plunger tip ( 4 ), which is curved cylindrically. The plunger needle ( 3 ) according to the invention, with its specially configured plunger tip ( 3 ), permits reliable guiding of the lens (L) upon injection into an eye and prevents the lens (L) becoming stuck in the injector. It is also easy to produce.
1. A plunger needle for use with an intraocular lens injector, the plunger needle comprising:
a plunger tip having a contact area for making contact with the lens and for pushing the intraocular lens through an opening in the intraocular lens injector for insertion into an eye, the contact area being arranged in a front face of the plunger tip,
wherein at least the contact area of the front face is inwardly curved, and
wherein the plunger needle has a longitudinal axis, and wherein the plunger tip is arranged axially offset relative to this longitudinal axis.
2. The plunger needle as claimed in claim 1 , wherein the plunger tip is wider than an adjacent area of the plunger needle.
3. The plunger needle as claimed in claim 1 , wherein said plunger needle is adapted for being releasably secured to a plunger rod.
4. The plunger needle as claimed in claim 1 , wherein said contact area is curved like the negative image of a jacket surface of a cylinder.
5. The plunger needle as claimed in claim 1 , wherein the plunger tip is arranged axially offset relative to the longitudinal axis along an offset direction, and wherein said contact area has an axis of curvature which is perpendicular both to said longitudinal axis and to the offset direction of the plunger tip.
6. The plunger needle as claimed in claim 5 , wherein said axis of curvature is offset relative to said longitudinal axis.
7. The plunger needle as claimed in claim 1 , wherein the front face of the plunger tip, in a first edge area, protrudes farther from the plunger needle than at a diametrically opposite second edge area.
8. The plunger needle as claimed in claim 7 , wherein the first edge area is the edge area which lies nearer the longitudinal axis than the second edge area, or wherein the first edge area is the edge area arranged farther away from the longitudinal axis than the second edge area.
9. The plunger needle as claimed in claim 1 , wherein the plunger tip has a jacket surface with an indentation for receiving at least one haptic of the lens.
10. The plunger needle as claimed in claim 9 , wherein the front face of the plunger tip, at a first edge area, protrudes farther from the plunger needle than at a diametrically opposite second edge area, and wherein the indentation is arranged at the first edge area.
11. The plunger needle as claimed in claim 9 , wherein the plunger tip is arranged axially offset relative to the longitudinal axis along an offset axis, said offset axis being perpendicular to said longitudinal axis, and wherein said indentation is arranged centrally with respect to said offset axis.
12. The plunger needle as claimed in claim 9 , wherein the plunger needle has a bearing surface in an area behind the plunger tip, and wherein the indentation in its deepest area is flush with the bearing surface.
13. An injector for inserting an intraocular lens into an eye, comprising:
a grip body; and
a plunger displaceable in said grip body in a guided manner, said plunger comprising a plunger needle including a plunger tip having a contact area for making contact with the lens, the contact area being arranged in a front face of the plunger tip,
wherein at least the contact area of the front face is inwardly curved, and
wherein the plunger needle has a longitudinal axis, and wherein the plunger tip is arranged axially offset relative to this longitudinal axis.
14. The injector as claimed in claim 13 , wherein said contact area is curved like the negative image of a jacket surface of a cylinder.
15. The injector as claimed in claim 13 , said plunger further comprising a plunger rod, and said plunger needle being releasably secured to said plunger rod.
16. The injector as claimed in claim 13 , further comprising a lens holder on said grip body and a cartridge disposed in said lens holder, said plunger needle passing through said cartridge for pushing said lens out of said cartridge.
17. The injector as claimed in claim 16 , wherein the plunger tip has a substantially circle-shaped circumference line, with deviations from the circle shape being adapted to the type of cartridge used.
18. A plunger needle for use with an intraocular lens injector, the plunger needle comprising:
a longitudinal axis, and
a plunger tip having a contact area for making contact with the lens and for pushing the intraocular lens through an opening in the intraocular lens injector for insertion into an eye, the contact area being arranged in a front face of the plunger tip,
wherein at least the contact area of the front face is inwardly curved,
wherein the contact area has an axis of curvature that is perpendicular to said longitudinal axis, and
wherein the contact area has an angle of opening, defined as the angle between normal vectors at opposing ends of the contact area, of 21° to 39°.
19. The plunger needle as claimed in claim 18 , wherein said contact area is curved like the negative image of a jacket surface of a cylinder.
20. The plunger needle as claimed in claim 18 , wherein the contact area has a radius of curvature of approximately 3 millimeters.
21. An injector for inserting an intraocular lens into an eye, comprising:
a grip body; and
a plunger displaceable in said grip body in a guided manner, said plunger comprising a plunger needle including a longitudinal axis and a plunger tip, the plunger tip having a contact area for making contact with the lens and for pushing the intraocular lens through an opening in the intraocular lens injector for insertion into an eye, the contact area being arranged in a front face of the plunger tip,
wherein at least the contact area of the front face is inwardly curved,
wherein the contact area has an axis of curvature that is perpendicular to said longitudinal axis, and
wherein the contact area has an angle of opening, defined as the angle between normal vectors at opposing ends of the contact area, of 21° to 39°.
22. The injector as claimed in claim 21 , wherein said contact area is curved like the negative image of a jacket surface of a cylinder.
23. The injector as claimed in claim 21 , wherein the contact area has a radius of curvature of approximately 3 millimeters.
24. The injector as claimed in claim 21 , in which the injector can be assigned at least one type of lens for use with this injector, and this type of lens has a radius of curvature, wherein the radius of curvature of the contact area of the plunger tip corresponds at least approximately to this radius of curvature of the lens.