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US 5,059,204 AGranted
Ocular cutter with enhanced cutting action
AssigneeSite Microsurgical Systems, Inc.
InventorsWilliam C. Lawson, Jude V. Paganelli, Perry Sepielli
Life of this patent
Estimating the term…
Abstract
The inner needle in a guillotine type ocular cutter is ground and placed within the swaged outer needle in an interference fit, so that a radial force is exerted by said inner needle on said outer needle to better shear the ocular tissue. Further, a positive stop is effected on the drive shaft controlling the inner needle so that the distance from the end of the outer needle port to the tissue is minimized. Alternately, the drive shaft has a dwell exerted on it.
Claims8
A tissue cutter comprising:
- a hollow inner needle with an elongated end and circular cross-section;
- and
- an outer needle with circular cross-section enclosing an open inner portion, said outer needle closed at one end, and said outer needle circular cross-section containing an opening near said one end for the insertion of tissue;
- said inner needle reciprocable within the inner portion of said outer needle;
- and
- a rotary can means wherein said inner needle reciprocates by motion against said cam means having a dwell at the end of the stroke of said inner needle within said outer needle, said dwell extending at least 15 degrees of angular rotation of said rotary cam means;
- wherein the outer circumference of said inner needle is generally smaller than the inner circumference of said outer needle;
- and wherein the outer circumference of said elongated end gradually increases distally along said inner needle length;
- such that at said elongated end, the outer circumference of said inner needle:
- (a) fits within the inner circumference of said outer needle in an interference fit;
- and (b) has an arc greater than 120.degree. along it circular cross-section removed.
8 more elements
Dependencies are inferred from the claim text.