Surgical cutting instrument

Details Surgical cutting instrument Surgical cutting instrument

1991-02-14

1993-06-08

Rosenbaum, C. Fred

Surgery

Instruments

Cutting, puncturing or piercing

128751, A61B 1700

Patent

active

052174794

ABSTRACT:
The cutting strength of a rotary surgical cutting instrument is increased by an on-axis bearing contact between the distal end of its rotatable inner member and the interior surface of its outer member. The outer member is provided with a distal cutting aperture angularly oriented to the rotation axis and circumscribed by an oval outer cutting edge. The inner member has two symmetrical rows of straight-sided triangular cutting teeth positioned to cooperate with the outer cutting edge to shear tissue, including bone, disposed in the cutting aperture. A clearance gap between the inner and outer members narrows in width in the region between the teeth and the aperture to prevent severed tissue from lodging between the inner and outer members. The height of the cutting teeth is at least 50% of their width, and 15% to 22% of the outer diameter of the inner member. The straight sides of the teeth converge to crests disposed in a first common longitudinal plane. The teeth are separated by roots disposed in a second plane parallel to the first plane but disposed closer than the first plane to the rotation axis.

REFERENCES:
patent: 2574066 (1951-11-01), See
patent: 2721555 (1952-12-01), Jenney
patent: 3618611 (1971-11-01), Urban
patent: 3732858 (1973-05-01), Banko
patent: 4167943 (1979-09-01), Banko
patent: 4368734 (1983-01-01), Banko
Biomed. Eng. (USA), vol. 13, No. 4, (Jul.-Aug. 1979) (Publ. Mar. 1980) "New Biopsy Instruments"-E. I. Aksenova et al.

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