Tibial insert reinforcement pin
AssigneeJohnson & Johnson Professional, Inc.
InventorRobert C. Hurlburt
Life of this patent
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Abstract
A knee prosthesis includes a femoral component, a patella insert, a tibial bearing insert, a tibial tray and a reinforcement pin. The reinforcement pin is constructed such that it includes a ribbed region comprised of one or more circumferentially oriented ribs. The diameter of the ribbed region of the pin exceeds that of the non-ribbed region of the pin. The reinforcement pin is adapted to seat within a bore formed in the tibial bearing insert in an interference fit. A distal portion of the pin protrudes from the inferior surface of the tibial bearing insert and is adapted to fit, in a clearance fit, within a bore formed in a superior surface of the tibial tray.
Claims15
A knee joint prosthesis, comprising:
- a tibial tray component having an inferior surface adapted to mount within the tibia of a patient and an opposed superior surface including a first mating means for mechanically joining the tibial tray to a tibial bearing insert;
- a tibial bearing insert having a superior bearing surface with condylar portions adapted to seat condyle elements of a femoral component of a knee prosthesis, and an opposed inferior surface having second mating means for mechanically joining the tibial bearing insert within the superior surface of the tibial tray component;
- a first bore extending partially into the tibial bearing insert from the inferior surface of the bearing insert;
- an elongate reinforcement pin having a first, proximal end that is spherically shaped and a second, distal end, the pin including a ribbed region having at least one circumferentially oriented rib disposed distally of the first end, and an axial break in the ribbed region forming a discontinuity in each rib, the pin being configured to mount at least partially within the bore such that the ribbed region interferingly engages the tibial insert.
Dependencies are inferred from the claim text.