Joint prothesis
OwnerPer-Ingvar Branemark, Bjorn Albrektssoninventors
Life of this patent
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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.
Claims10
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 during a healing phase, said anchorage device remaining in an unloaded condition during said healing to allow functioning of the joint;
- 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 internally threaded tubular members forming said leg fixtures insertable from the femur joint surface and said articulation device for the femoral component further comprises an articulatory surface rail part and a separate interconnecting L-shape part connected to said tubular members by two locking screws screwed into threaded interior of said tubular members.
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 screwable in the bone tissue and said articulation device for the femoral compnent further comprises an articulatory surface part and a separate L-shaped interconnecting part connected to said tubular members.
Dependencies are inferred from the claim text.