System for cutting the cornea of an eye
A system for cutting the cornea of an eye, includes a moveable member with a cutting blade at one end, a pivot element and a cutting guide restraint. A mechanism for oscillating the moveable member around the pivot element and a cutting guide are configured to engage the cutting guide restraint on the moveable member and thereby limit the degree of angular movement of the cutting blade as the moveable member oscillates about the pivot element. A positioning system is configured to advance the moveable member with respect to the cutting guide such that the shape of the cutting guide determines the shape of a cut made by the cutting blade. A suction ring for stabilizing the cornea and an applanating plate for flattening the cornea usually complete the system.
1. A system for cutting the cornea of an eye, said system comprising:
a frame defining an X axis and a Y axis, which frame can be immobilized outside of the cornea;
a moveable member having a cutting element at a distal end thereof; said moveable member being mounted on a pivot which is movably mounted relative to the frame; and
a first programmable driver comprising a wheel-coupled to the pivot, said driver adapted to rotate the wheel to move the pivot over a path;
a second programmable driver comprising a gear which is coupled to rotate the movable member over the pivot so that driving the wheel and gear advance the cutting element into an uncut cornea through a small initial incision in the cornea and cut a circular boundary of a pocket inside the cornea without enlarging the small initial incision.
2. A system as in claim 1 , wherein the frame comprises a suction ring.
3. A system as in claim 1 , wherein the system further comprises a corneal applanator.
4. A system as in claim 1 , wherein the moveable member is linear.
5. A system as in claim 1 , wherein the cutting element is deformable.
6. A system as in claim 1 , wherein the wheel carries the pivot over a circular path.
7. A system as in claim 6 , wherein the wheel is rotatably mounted within the gear.
8. A system as in claim 7 , wherein the movable member is coupled to the gear by a protrusion on the gear which translates in a slot in the movable member.
9. A system as in claim 1 , wherein the wheel engages a platform which carries the pivot over a lateral path.