Patellar bearing implant

• US 20010037155A1
• Filed: 03/15/2001
• Published: 11/01/2001
• Est. Priority Date: 03/21/2000
• Status: Active Grant

• Current Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Original Assignee: Alan C. Merchant
• Inventors: Merchant, Alan C.
• Granted Patent: US 6,709,460 B2
• Time in Patent Office: Days
• US Class Current: 623/20.18
• CPC Class Codes: A61F 2/3877 Patellae or trochleae
• CPC Class Codes: A61F 2002/3881 with moving parts

Abstract

A patellar bearing having extended, rounded contours on the superior and inferior edges of its articulating surface.

Claims

1. A patellar implant comprising a base plate and an articular bearing surface for engaging the femoral component in a total knee replacement or a trochlear component in a total patellofemoral replacement, characterized in that:

said patellar implant having a superior articular surface which has a smooth rounded contour.

2. A patellar implant as in

claim 1

in which the base plate is made of chrom-cobalt-molybdenum alloy and the bearing surface is high-density polyethylene.

3. A patellar implant as in claims 1 or 2 in which the inferior articular surface also has a smooth rounded contour.

4. A patellar implant comprising an articular bearing surface for engaging the femoral component in a total knee replacement, or a trochlear component in a total patellofemoral replacement, characterized in that:

said patellar implant has an extended superior-to-inferior dimension with rounded contours on the superior and inferior edges of the surfaces which articulate with either the femoral prosthetic component or the trochlear prosthetic component.