Prosthesis system and method of implanting
First Claim
Patent Images
1. An implantable prosthesis system, comprising:
- a body having an inner surface and an outer, mounting surface with at least one aperture extending therebetween;
an inner member having a first surface matable against the inner surface of the body and a second, opposed bearing surface;
at least one sleeve having a substantially elongate shape and being matable with the at least one aperture of the body, the at least one sleeve having an outer surface with a proximal end, a distal end, and a cylindrically shaped intermediate region between the proximal end and distal end, the at least one sleeve further including a longitudinally oriented bore extending therethrough from a proximal opening to a distal opening, and being matable with the at least one aperture such that the distal opening of the at least one sleeve is spaced from the outer, mounting surface of the body; and
at least one elongate fixation element mountable within the at least one sleeve to secure the body to bone, the at least one fixation element having a proximal head portion seatable within the at least one sleeve adjacent the distal opening of the at least one sleeve and a shaft portion extending distally from the head portion.
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Abstract
A prosthetic joint system includes a body having at least one aperture into which an elongate sleeve component is engageable. A screw for securing the body to bone is insertable into the bone via a bore in the sleeve. The bore has a length that is sufficient to accommodate movement of the screw as the prosthesis subsides over time. More particularly, the sleeve allows the screw head to move longitudinally such that the screw is prevented from damaging an inner member of the prosthesis system that provides an articulation surface for a corresponding prosthetic joint component. In one embodiment, a prosthesis system includes an acetabular cup for a prosthetic hip joint.
188 Citations
17 Claims
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1. An implantable prosthesis system, comprising:
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a body having an inner surface and an outer, mounting surface with at least one aperture extending therebetween;
an inner member having a first surface matable against the inner surface of the body and a second, opposed bearing surface;
at least one sleeve having a substantially elongate shape and being matable with the at least one aperture of the body, the at least one sleeve having an outer surface with a proximal end, a distal end, and a cylindrically shaped intermediate region between the proximal end and distal end, the at least one sleeve further including a longitudinally oriented bore extending therethrough from a proximal opening to a distal opening, and being matable with the at least one aperture such that the distal opening of the at least one sleeve is spaced from the outer, mounting surface of the body; and
at least one elongate fixation element mountable within the at least one sleeve to secure the body to bone, the at least one fixation element having a proximal head portion seatable within the at least one sleeve adjacent the distal opening of the at least one sleeve and a shaft portion extending distally from the head portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An acetabular cup system, comprising:
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a first member having a convex outer surface and a concave inner surface with at least one aperture extending between the inner and outer surfaces of the first member;
a convex bearing member having an outer surface matable against the inner surface of the first member and an inner, bearing surface; and
at least one sleeve component having a substantially elongate shape and being matable within the at least one aperture of the first member, the at least one sleeve component having an outer surface with a flared proximal end adapted to seat within the at least one aperture of the first member, a distal end, a cylindrically shaped intermediate region between the proximal end and distal end, and a longitudinal bore extending through the at least one sleeve component from the proximal end to the distal end thereof, the longitudinal bore defining a screw head-seating surface at the distal end of the bore. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of implanting a prosthesis system, comprising:
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reaming a cavity in bone;
implanting a prosthetic component in the cavity, the prosthetic component having an aperture;
forming a hole in the bone via the aperture, the hole having a first diameter;
enlarging the diameter of a selected portion of the hole so as to form an enlarged portion and an unenlarged portion;
inserting a sleeve component into the enlarged portion of the hole;
inserting a fixation screw into the unenlarged portion of the hole; and
rotating the fixation screw to affix the prosthetic component to the bone. - View Dependent Claims (16, 17)
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Specification