Prosthetic knee joint
OwnerW. E. Michael Mikhailinventor
Life of this patent
Estimating the term…
Abstract
A prosthetic knee joint including femoral and tibial component joined together with support means permitting flexing of the knee and rotational movement of the tibia during flexing approaching that of the matural knee. The support means include flexible synthetic ligaments and various configurations of hinge means.
Claims28
A prosthetic knee joint comprising:
- (a) a femoral component having a condylar portion defining a pair of spaced apart convex bearing surfaces, a housing having side walls between said bearing surfaces and pivot bar means extending from said side walls, said femoral component having a lateral collateral side and a medial collateral side;
- (b) a tibial component including fixation means for affixing to a tibia, said tibial component having a pair of spaced apart concavities engaged by said convex bearing surfaces and a column between said concavities extending toward said femoral component between said side walls;
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- (c) support means connected to said pivot bar means for connecting said femoral component to said tibial component, said support means permitting relative movement between said femoral component and said tibial component;
- said support means comprising synthetic prosthetic ligament means on at least one of said collateral sides having a first end and a second end and having means for joining said first end to said pivot bar and said second end to said tibial component.
A prosthetic knee joint according to claim 31, wherein said means for fixing said body relative to said strands comprises crimped walls tightly engaging said strands.
A prosthetic knee joint according to claim 31, wherein said means for fixing said body relative to said strands includes at least two passages in said body and wall means separating said passages, a first portion of said strands positioned in one passage and a second portion of said strands positioned in the other of said passages and means for joining together said first and second portions.
A prosthetic knee joint according to claim 19, wherein said support means comprises said column and a passageway extending transversely through said column from a first end to a second end and said pivot bar means extends through said passageway.
A prosthetic knee joint according to claim 19, wherein said support means comprises said column, said column being in the shape of a hook defining a passageway, said pivot bar means extending through said passageway, said passageway following a non-circular curved path in a direction transverse to said pivot bar means.
A prosthetic knee joint according to claim 19, wherein said tibial component includes a tibial plateau and said support means comprises said column extending from said tibial plateau and defining a hook having a passageway through which said pivot bar extends, said hook having a peripheral opening defining a peripheral entrance to said passageway for said pivot bar means, and means for at least partially closing said peripheral opening to prevent removal of said pivot bar through said peripheral entrance.
A prosthetic knee joint comprising
- (a) a femoral component having a condylar portion defining a pair of spaced apart convex bearing surfaces, a housing having a pair of spaced apart side walls extending upwardly from said bearing surfaces and pivot bar means extending from each of said side walls, said femoral component having a lateral collateral side and a medial collateral side;
- (b) a tibial component including fixation means for affixing to a tibia, said tibial component having a pair of spaced apart concavities engaged by said convex bearing surfaces and a column between said concavities extending toward said femoral component between said side walls;
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- (c) support means connected to said pivot bar means for connecting said femoral component to said tibial component, said support means permitting relative movement between said femoral component and said tibial component.
A prosthetic knee joint comprising
- (a) a femoral component having fixation means for affixing to a femur and a pair of spaced apart first and second condylar portions with convex bearing surfaces, said femoral component having a lateral collateral side and a medial collateral side, said first condylar portion adjoining one of said collateral sides and said second condylar portion adjoining the other of said collateral sides;
- (b) a tibial component including fixation means for fixing to a tibia, said tibial component having a lateral collateral side and a medial collateral side;
- (c) flexible synthetic prosthetic ligament means having a first end secured to at least one of the collateral sides of said femoral component and a second end secured to at least one of the collateral sides of said tibial component, said prosthetic ligament means permitting relative rotation between said femoral and tibial components;
- (d) means for securing said flexible synthetic prosthetic ligament means to said femoral component and to said tibial component, said means for securing comprising a hub member which includes a ring defining an aperture, a plurality of legs extending from said ring along said collateral side of said first condylar portion and tine members extending laterally from said legs inwardly toward said second condylar portion and joined to said first condylar portion, post means engaged to said hub member and means for fastening said flexible synthetic prosthetic ligament means to said post means.
A prosthetic knee joint comprising
- (a) a femoral component having fixation means for affixing to a femur and a pair of spaced apart first and second condylar portions with convex bearing surfaces, said femoral component having a lateral collateral side and a medial collateral side, said first condylar portion adjoining one of said collateral sides and said second condylar portion adjoining the other of said collateral sides;
- (b) a tibial component including fixation means for fixing to a tibia, said tibial component having a lateral collateral side and a medial collateral side;
- (c) flexible synthetic prosthetic ligament means with a plurality of strands having a first end secured to at least one of the collateral sides of said femoral component and a second end secured to at least one of the collateral sides of said tibial component, said prosthetic ligament means permitting relative rotation between said femoral and tibial components;
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- (d) means for adjusting the length of said strands, said means including a fastener having a body encircling said strands, said body being moveable relative to said strands and means for fixing said body relative to said strands.
Dependencies are inferred from the claim text.