Metal-ceramic composite articulation
First Claim
1. A joint prosthesis for articulation, comprising:
- a first component shaped as a cup prosthesis and having a generally concave articulation surface formed from a biocompatible doped silicon nitride ceramic having a flexural strength greater than about 700 Mega-Pascal (MPa) and a toughness greater than about 7 Mega-Pascal root meter (MPam0.5); and
a second component shaped as a head prosthesis and having a generally convex articulation surface formed from a biocompatible cobalt chromium metal alloy.
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Accused Products
Abstract
A ceramic-metal composite articulation is provided with substantial elimination of wear debris, wherein a ceramic material is provided with superior mechanical properties tailored for articulating with ceramic articulations having high flexural strength (greater than about 700 MPa), high fracture toughness (greater than about 7 MPa1/2) and a high Weibull modulus (greater than about 20), in comparison with presently available bio-ceramics such as alumina or zirconia. The mechanical property enhancement enables ceramic materials with greater reliability and significantly reduced in-vivo fracture risk to be obtained. Preliminary in-vitro wear performance, to several million cycles using established test protocols, of head/cup components in a prosthetic hip joint made from these ceramics also demonstrates the ultra low wear characteristics. These material properties substantially eliminate polyethylene (PE) wear debris mediated implant failures by offering an optimal combination of bio-mechanical safety and reliability with ultra low wear performance.
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Citations
28 Claims
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1. A joint prosthesis for articulation, comprising:
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a first component shaped as a cup prosthesis and having a generally concave articulation surface formed from a biocompatible doped silicon nitride ceramic having a flexural strength greater than about 700 Mega-Pascal (MPa) and a toughness greater than about 7 Mega-Pascal root meter (MPam0.5); and
a second component shaped as a head prosthesis and having a generally convex articulation surface formed from a biocompatible cobalt chromium metal alloy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A hip joint prosthesis, comprising:
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an acetabular cup having an articulation surface formed from a biocompatible doped silicon nitride ceramic having a flexural strength greater than about 700 Mega-Pascal (MPa) and a toughness greater than about 7 Mega-Pascal root meter (MPam0.5); and
a femoral head having an articulation surface formed from a biocompatible cobalt chromium metal alloy. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A joint prosthesis for articulation, comprising:
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a first component including an articulation surface formed from a biocompatible and high compressive strength doped silicon nitride ceramic, said articulation surface having a flexural strength greater than about 700 Mega-Pascal (MPa) and a toughness greater than about 7 Mega-Pascal root meter (MPam0.5); and
a second component having an articulation surface formed from a biocompatible and high tensile strength cobalt chromium metal alloy;
said first component comprising a cup component and said second component comprising a head component for substantially mated articulation with said cup component. - View Dependent Claims (26, 27, 28)
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Specification