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US 6,149,661 AGranted
Step knife
OwnerPaul M. Graczykinventor
Life of this patent
Estimating the term…
Abstract
A step knife for use in eye surgery has a blade which extends a predetermined length beyond a footplate. The blade has a sharpened lower edge and each of the sides have a sharpened portion near the lower edge and an unsharpened portion near the footplate.
Claims6
A step knife comprising
- a blade having opposing faces, opposing sides, and a sharpened bottom,
- a footplate fixing the extension of said blade from said footplate to said bottom,
- said opposing sides each having a sharpened portion adjacent to said bottom and an unsharpened portion between said sharpened portion and said footplate, said unsharpened portions preventing an unintentional lengthening of a cut made by said blade wherein said cut is made by plunging said blade into tissue until said footplate contacts a surface of said tissue.
Dependencies are inferred from the claim text.