The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 1991
Filed:
Apr. 24, 1989
Joseph J Mazza, Marshfield, WI (US);
Marshfield Clinic, Marshfield, WI (US);
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.