Patent ID: 11883298
Assignee: DEPUY IRELAND UNLIMITED COMPANY
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 12:
13. The orthopaedic knee prosthesis of claim 10, wherein a distal-most point of the femoral articular surface when the femoral component is in extension defines zero degrees of flexion, and
wherein the first curved femoral surface section extends from a first degree of flexion of about 5 degrees to a second degree of flexion of about 65 degrees and is defined by a plurality of rays extending from a common origin to a corresponding point on the second curved femoral surface section, and wherein each ray has a length defined by the following polynomial equation:

rθ=(a+(b*θ)+(c*θ2)+(d*θ3)),

wherein rθ is the length of the ray defining a point on the second curved femoral surface section at θ degrees of flexion, a is a coefficient value between 20 and 50, and b is a coefficient value in a range selected from the group consisting of: −0.30<b<0.00, 0.00<b<0.30, and b=0,
wherein when b is in the range of −0.30<b<0.00, (i) c is a coefficient value between 0.00 and 0.012 and (ii) d is a coefficient value between −0.00015 and 0.00,
wherein when b is in the range of 0<b<0.30, (i) c is a coefficient value between −0.010 and 0.00 and (ii) d is a coefficient value between −0.00015 and 0.00, and
wherein when b is equal to 0, (i) c is a coefficient value in a range selected from the group consisting of: −0.0020<c<0.00 and 0.00<c<0.0025 and (ii) d is a coefficient value between −0.00015 and 0.00.