Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1994-12-12
1998-10-20
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 238
Patent
active
058240969
ABSTRACT:
A femoral component with a femoral stabilizing implanted rod has condylar surfaces of different radii which mate with a thermoplastic bearing. A mating tibial platform is stabilized in the tibia with a rod, the bearing translating on the platform in the posterior-anterior directions in response to knee flexion and extension. The bearing bears the full extension load on congruent articulating contact regions with the condylar surfaces and lesser flexion loads via incongruent articulating contact. A hinge assembly is pinned to the femoral condylar component through a head having a depending shaft fixed to a thermoplastic tapered bearing axially floating and rotatably movable in a tibia platform component mating cavity. The head passes through the bearing and stops the bearing translations at extreme posterior and anterior positions. In a second embodiment, a projection on the tibial component mates in a recess in the bearing for controlling and limiting the amount of axial rotation of the femoral component relative to the tibial component as a function of the extent of flexion in a knee joint.
REFERENCES:
patent: 4092740 (1978-06-01), Eshiriqui
patent: 4206517 (1980-06-01), Pappas et al.
patent: 4219893 (1980-09-01), Noiles
patent: 4470158 (1984-09-01), Pappas et al.
patent: 4888021 (1989-12-01), Forte et al.
patent: 5139521 (1992-08-01), Schelhas
patent: 5314481 (1994-05-01), Bianco
patent: 5370701 (1994-12-01), Finn
Buechel, Frederick F., nj LCS Tricompartmental Knee System with Porocoat.
Buechel Frederick F.
Pappas Michael J.
Biomedical Engineering Trust I
Budzyn Ludomir A.
Casella Anthony J.
Hespos Gerald E.
Isabella David
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