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. 05, 1996
Filed:
Jun. 20, 1994
Milton F Barnes, Warsaw, IN (US);
Zimmer, Inc., Warsaw, IN (US);
Abstract
A milling apparatus 2 including an articulated cutter 20 and an inverted L-shaped frame 10 for removing a unique geometric volume of bone to receive a prosthetic implant stem. Cutter 20 is housed within frame 10 for rotational movement about its longitudinal axis and lateral movement along a guide 16, which extends laterally from frame 10. Cutter 20 includes a pair of articulated arms 30, 32 each carrying a plurality of cutting blades 40. The proximal end 22 of cutter 20 is seated in an elongated non-radial race 17 formed in guide 16. Articulated arms 30, 32 provide a 'scissoring' action which allows cutter 20 to be compressed longitudinally when shifted to one end of race 17 and extended longitudinally when shifted to the opposite end of race 17. The scissoring action of arms 30, 32 also changes the angle of the cutting face of blades 40 carried by arms 30, 32. Consequently, milling apparatus 2 creates a receiving cavity having an egg-shaped cross section.