Cam-guided trephine
Patent 4423728 Issued on January 3, 1984. Estimated Expiration Date: 
February 26, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 26, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2249906 3537345 3628522 Twin template cam tracker Contact lens corneal cutter Servoelectric micromanipulator for movement on spherical coordinates Patent #: 4342951 InventorApplicationNo. 06/352523 filed on 02/26/1982US Classes:606/166, Corneal cutter or guide for corneal cutter33/27.01, Curved line33/27.12, Pattern follower606/180Rotary cutterExaminersPrimary: Rosenbaum, C. FredAssistant: Kruter, J. L. Attorney, Agent or FirmInternational ClassesA61F 9/007 (20060101)A61F 9/013 (20060101) AbstractA cam-guided trephine for selectively cutting a portion of an eye provides a first, vertically disposed blade to provide an annular cut of essentially any practical shape, diameter and depth, while concurrently allowing a second, angled blade, to simultaneously provide a circular cut of substantially any practical angle, diameter, and depth. Each of the blades may be individually controlled by the surgeon, alternately and progressively lowered onto the eye during series of rotations.Other References
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