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:
Jun. 26, 1990
Filed:
Apr. 29, 1988
Peter S Walker, Northwood N.W. London, GB;
Frederick C Ewald, Weston, MA (US);
Other;
Abstract
A customized human joint prosthesis replicating the primary contours and dimensions of a patient's bone is designed and manufactured utilizing an average anatomical bone shape. The average anatomical bone shape is generated by digitizing and storing in a computer memory the average three dimensional shape of a significant number of actual bone portions corresponding to the bone portion to be replaced by the prosthesis. Thereafter, the scale of the patient's bone is determined by measuring the outside dimensions of the patient's bone in at least one plane parallel to the longitudinal axis of that bone. The average anatomical shape then is adjusted to form a first synthesized shape which conforms to that scale. Subsequently, the actual shape of the bone of the patient is measured along a plurality of longitudinally spaced lines in at least one plane normal to the longitudinal axis of the patient's bone. The first synthesized shape is then adjusted to form a second synthesized shape conforming to the measured shape of the patient's bone. The second synthesized shape is manufactured by CAD/CAM or other suitable means.