Joint surface replacement system
First Claim
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1. An articular surface replacement system comprising:
- a first component implanted into a first bone;
said first component having a partially spherical head piece dimensioned to cover an end of said first bone;
said first component having an integral, centrally located screw means for joining said first component to said bone, said screw means being affixed to an interior surface of said head piece and having a tapered threaded portion for allowing said first component to be anchored to the first bone;
said first component further having means for gripping said end of said bone and for allowing solid fixation by a compression press fit, said bone gripping means being integrally formed with said head piece and being radially spaced from the center of said head piece.
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Abstract
The present invention relates to an articular joint replacement system. The system has first and second components. Each component has a tapered head piece for covering the end of a bone and for acting as an articular surface, an integrally formed screw stem having a length sufficient to extend into the medullary canal, and inwardly angled bone grips affixed to the underside of the head piece to allow solid fixation to the bone by compression press fit. The head piece of the first component is provided with a shaped exterior surface which complements the shaped exterior surface of the head piece of the second component and which allows motion in three planes.
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Citations
24 Claims
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1. An articular surface replacement system comprising:
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a first component implanted into a first bone; said first component having a partially spherical head piece dimensioned to cover an end of said first bone; said first component having an integral, centrally located screw means for joining said first component to said bone, said screw means being affixed to an interior surface of said head piece and having a tapered threaded portion for allowing said first component to be anchored to the first bone; said first component further having means for gripping said end of said bone and for allowing solid fixation by a compression press fit, said bone gripping means being integrally formed with said head piece and being radially spaced from the center of said head piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23)
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22. An articular surface replacement system comprising:
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a first component to be inserted into a pre-drilled hole in a first bone; a second component to be inserted into a pre-drilled hole in a second bone; each of said first and second components comprising a uni-body construction having a head piece dimensioned to cover only an end of one of said first and second bones, an integrally formed centrally located screw having a tapered threaded portion for insertion into one of said pre-drilled holes in said first and second bones, and integrally formed inwardly angled, radially spaced, pin-shaped bone grips which penetrate into said end of one of first and second bones to anchor said respective one of said first and second components thereto; and said head piece of said first component having an arcuate shape and said head piece of said second component having a mating arcuate shape so that said components form a joint and permit motion in three planes. - View Dependent Claims (24)
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Specification