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US 8,894,664 B2Granted
Lens delivery system cartridge
AssigneeNovartis AG
InventorDavid Downer
Life of this patent
Estimating the term…
Abstract
A cartridge for an IOL delivery system that has an injector tip geometry designed to reduce stresses at the incision wound edges generated during insertion of an IOL into an eye is disclosed. The injector tip geometry includes a tubular nozzle having a modified elliptical cross section. The injector tip geometry reduces stresses generated reduce the likelihood of tearing or overstretching the wound during cartridge tip insertion and residence time in the wound while the lens is being delivered into the eye.
Claims3
An intraocular lens delivery system cartridge, comprising:
- a body, and
- a tubular nozzle connected to the body and projecting distally from the body, the nozzle having a cross-section, the cross-section having a shape defined by:
- a portion of an ellipse disposed in a first quadrant and a second quadrant of a Cartesian coordinate system, the ellipse having a center that is offset from the origin of the Cartesian coordinate system in a direction along a negative portion of an ordinate axis of the Cartesian coordinate system, the portion of the ellipse defined as a first curve;
- and
- a second curve defined as a mirror image of the first curve mirrored about an abscissa axis of the Cartesian coordinate system, the first curve and the second curve forming first and second points at locations where the first curve and the second curve intersect the abscissa axis of the Cartesian coordinate system;
- and
- circular arcs formed at opposing ends of the cross-section proximate the first and second points, each circular arc defined as a portion of a circle joining the first curve and the second curve that is tangent to both the first curve and the second curve and that has a 90 degree tangent line at a point along the abscissa axis crossed by the circular arc.
4 more elements
Dependencies are inferred from the claim text.