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:
Mar. 30, 1993
Filed:
Apr. 02, 1991
Applicant:
Inventor:
Frank Wilson, Prospect Park, PA (US);
Assignee:
Synthes (U.S.A.), Paoli, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61F / ;
U.S. Cl.
CPC ...
606 79 ; 606 80 ;
Abstract
An improved trephine instrument for use in bone surgery comprises a tubular casing, an annular cutting face disposed on one end of the casing, and a cannulated piston mounted on a spring in the housing. The cutting face comprises a plurality of prongs spaced from each other, with thickened cutting edges at their tips. The head of the piston exends beyond the cutting face in the forward position. A flange is formed at the head of the piston. In use, a Kirschner wire is attached to the bone and inserted into the cannulation in the piston. The trephine instrument is then rotated and pressed foward to cut a bone plug.