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US 6,126,690 AGranted
Anatomically correct prosthesis and method and apparatus for manufacturing prosthesis
AssigneeThe Trustees of Columbia University in the City of New York
InventorsGerard A. Ateshian, Van C. Mow, Robert J. Pawluk, Melvin P. Rosenwasser
Life of this patent
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Abstract
A joint prosthesis for attachment to a bone of a patient, comprising an anchor with a head surface and a stem for attachment to an end of the bone, the head surface having an anatomically accurate shape.
Claims20
A joint prosthesis for attachment to a bone of a patient, comprising:
- an anchor with a head surface and a stem for attachment to an end of the bone;
- the head surface having an anatomically accurate shape, where the anatomically accurate shape has a surface derived from examination of the actual shape of the joint surface of at least one subject, and replicating the actual shape of the joint surface of at least one subject, and wherein all the points on the surface of the head surface which replicate the actual shape of the joint surface of the subject are defined by ##EQU5## where x.sub.k represents a point on the surface of the actual share of the joint surface of the subject at the parametric coordinates (u,w), k=1,2,3 indicates the three coordinates directions and a.sub.ijk (i, j=0 to n) represents the polynomial coefficients of u and w for the actual anatomical shape of the joint surface of at least one subject, and wherein n is at least 3.
A total joint prosthesis for attachment to two bones of a patient, comprising:
- two unjoined anchors, each with a head surface and a stem for attachment to ends of respective ones of the two bones;
- each of the head surfaces having an anatomically accurate shape, where the anatomically accurate shape has a surface derived from examination of the actual shape of the joint surface of at least one subject, and replicate the actual share of the joint surface of at least one subject and wherein all the points on the surface which replicate the actual shape of the joint surface of the subject of the head surface are defined by ##EQU6## where x.sub.k represents a point on the surface of the actual shape of the joint surface of the subject at the parametric coordinates (u,w), k=1, 2, 3 indicates the three coordinates directions and a.sub.ijk (i, j=0 to n) represents the polynomial coefficients of u and w for the actual anatomical shape of the joint surface of at least one subject, and wherein n is at least 3.
A total joint prosthesis for attachment in the bones of a patient, comprising:
- two unjoined anchors, each with a head surface and a stem for attachment to end of respective ones of the two bones;
- each of the head surfaces having an anatomically accurate shape of the joint surface of a least one subject based upon a particular often of a plurality of articular joint surfaces within a database of mathematical descriptions of said plurality of articular joint surfaces, where the anatomically accurate shape has a surface derived from examination of the actual shape of the joint surface of at least one subject, and replicate the actual shape of the joint surface of at least one subject, and wherein all the points on the surface of the head surface which replicate the actual shpae of the joint surface of the subject are defined by ##EQU7## where x.sub.k represents a point on the surface of the actual share of the joint surface of the subject at the parametric coordinates (u,w), k=1, 2, 3 indicates the three coordinates directions and a.sub.ijk (i, j=0 to n) represents the polynomial coefficients of u and w for the actual anatomical shape of the joint surface of at least one subject, and wherein n is at least 3.
The prosthesis of claim 17, wherein the database comprises a plurality of articular joint surface archetypes.
Dependencies are inferred from the claim text.