Joint prosthesis
OwnerAndergaten 3, Bjorn Albrektssoninventors
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Abstract
This invention relates to a joint prosthesis for permanent anchorage in the bone tissue of a joint in a human body, for instance a knee joint. The joint prosthesis comprises an anchorage device (3, 4; 7-10, 11) disposed to be implanted into the bone tissue at a first operation so that it remains in unloaded condition during a healing phase during which the function of the joint is not prevented and an articulation device (5, 6; 13, 12) which is arranged to be connected to the anchorage device only at a second operation after the said healing phase.
Claims2
A two-phase surgical procedure for permanent anchorage of a joint prosthesis in bone tissue of a joint in a human body, such as a knee joint, comprising the steps of:
- implanting at least two tubular anchorage devices made of a pure titanium and including at least two tubular fixture legs, which are screwed into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation,
- retaining said anchorage devices in an unloaded condition during a healing phase to allow functioning of the joint,
- connecting an articulation device for the tibial component into firmly anchored fixture legs of said anchorage device of the tibial component with connecting means during a second operation subsequent to said healing phase;
- connecting an interconnecting part of an articulation device for the femoral component to said fixture legs by two loading elements;
- and
- connecting an articulatory surface part of said articulation device to said interconnecting part.
A joint prosthesis for permanent anchorage in bone tissue of a joint in a human body, for example, a knee joint, comprising:
- at least two anchorage devices, at least one of them for implantation into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation, each of said anchorage devices including at least one fixture leg forming a healing surface towards surrounding bone tissue and adapted to be firmly anchored into said tissue during a healing phase, said anchorage device remaining in an unloaded condition during said healing phase to allow functioning of the joint, and
- at least two articulation devices, at least one of them for each of the femoral and tibial components, respectively, each articulation device including a corresponding articulatory surface and connecting means for interconnecting said articulation device to said firmly anchored fixture leg during a second operation subsequent to said healing phase, wherein at least said anchorage devices are made of pure titanium;
- and,
- wherein said anchorage device for the femoral component comprises at least two separate screw-shaped tubular members forming said leg fixtures and being screwable in the bone tissue, and wherein said articulation device for the femoral component further comprises:
- an articulatory surface part and a separate interconnecting part;
- means for connecting said interconnecting part to said tubular members;
- and
- means for connecting said articulatory surface part to said interconnecting part.
Dependencies are inferred from the claim text.