Biopsy needle construction

Details Biopsy needle construction Biopsy needle construction

1989-04-24

1991-04-09

Hindenburg, Max

Surgery

Truss

Pad

A61B 1000

Patent

active

050055852

ABSTRACT:
A biopsy needle assembly comprising an outer tubular cannula having an angular distal end. The inner surface of the cannula adjacent the distal end is cylindrical and an end of the inner cylindrical surface opposite the distal end of the cannula is undercut to provide a sharp annular interior edge. A solid stylus is disposed within the cannula and has an angular distal end. The stylus is in sliding contact with the inner cylindrical surface of the cannula. When the needle assembly is inserted into engagement with the tissue to be removed a specimen is collected internally of the cannula and the sharp undercut interior edge secures the specimen within the cannula. After removal of the cannula from the tissue, a rod-like probe is inserted in the distal end of the cannula to push the specimen through the entire length of the cannula to remove the specimen intact.

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patent: 4793363 (1988-12-01), Ausherman et al.
patent: 4867156 (1989-09-01), Stack et al.

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