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. 20, 2007
Filed:
Jan. 29, 1999
David A. Mcqueen, Kechl, KS (US);
Christoph A. Roth, Wichita, KS (US);
David A. McQueen, Kechl, KS (US);
Christoph A. Roth, Wichita, KS (US);
Orthopaedic Research Institute, Inc., Wichita, KS (US);
Abstract
A hip prosthesis () having a shell (), liner (), and retainer ring () is utilized for hip arthroplasty. The liner () fits inside the shell (), which is attached to a patient's pelvis, and the retainer ring () engages a terminal liner margin () to inhibit expansion of and decrease the size of a restricted liner opening () defined by the liner margin (). By inhibiting expansion of the liner opening (), the ball () of a patient's femur () is securely held in the liner (). In one embodiment, the liner () is inhibited from rotation relative to the shell () by a plurality of protrusions () which mate with recesses () in the shell (). In that embodiment, the liner () is provided with catch lips () to hold the liner () in the shell () and a positioning flange () which operates to form a relief gap () between the shell () and the liner (). In another embodiment, the retainer ring comprises an attachment portion () and a retainer portion () with a threaded connection () between the attachment portion () and the retainer portion ().