Femoral prosthesis
First Claim
1. A femoral prosthesis (1) for implantation by cementation in a bone bed (6), the prosthesis having a prosthesis stem (2) thereof with a longitudinal borehole (3) extending from a proximate end to a distal end for transprosthetic application of bone cement, the improvement comprising:
- spaces (7) for centering and aligning the prosthesis in the proximal region;
a medullary space blocker (8) for fastening the sheath (4) in the distal region;
an elastic sheath (4) of a biocompatible polymeric material, the sheath (4) having pores therein and surrounding the prosthesis stem in such a way that, on application of the cement through the bore hole, the sheath is filled starting at the distal end and advancing to the proximate end of the prosthesis, wherein when a space (5) between stem (2) and the bone bed (6) is completely filled, the elastic sheath (4) is pressed flush against the bone bed (6) and the pores widen so that the bone cement comes into contact with the bone bed (6).
2 Assignments
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Accused Products
Abstract
A femoral prosthesis for implantation by cementation, has the stem with a longitudinal borehole extending proximally to distally for the transprosthetic application of the bone cement. The prosthesis stem is surrounded by an elastic sheath of a biocompatible polymeric material in such a way that, on application of the cement, the sheath is filled advancing distally to proximally and, when the space between stem and bone bed is completely filled, pressed flush against the bone bed.
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Citations
11 Claims
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1. A femoral prosthesis (1) for implantation by cementation in a bone bed (6), the prosthesis having a prosthesis stem (2) thereof with a longitudinal borehole (3) extending from a proximate end to a distal end for transprosthetic application of bone cement, the improvement comprising:
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spaces (7) for centering and aligning the prosthesis in the proximal region; a medullary space blocker (8) for fastening the sheath (4) in the distal region; an elastic sheath (4) of a biocompatible polymeric material, the sheath (4) having pores therein and surrounding the prosthesis stem in such a way that, on application of the cement through the bore hole, the sheath is filled starting at the distal end and advancing to the proximate end of the prosthesis, wherein when a space (5) between stem (2) and the bone bed (6) is completely filled, the elastic sheath (4) is pressed flush against the bone bed (6) and the pores widen so that the bone cement comes into contact with the bone bed (6). - View Dependent Claims (2, 3, 4)
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5. A femoral prosthesis (1) for implantation by cementation in a bone bed (6), the prosthesis having the prosthesis stem (2) thereof with a longitudinal borehole (3) extending from a proximate end to a distal end for transprosthetic application of bone cement, the improvement comprising:
an elastic sheath (4) of a biocompatible polymeric material, the sheath (4) having pores therein and surrounding the prosthesis stem in such a way that, on application of the cement through the bore hole, the sheath is filled starting at the distal end and advancing to the proximate end of the prosthesis, wherein when a space (5) between stem (2) and the bone bed (6) is completely filled, the elastic sheath (4) is pressed flush against the bone bed (6) and the pores widen so that the bore cement comes into contact with the bone bed (6). - View Dependent Claims (6, 7, 8, 9)
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10. An implantation kit for implanting a prosthesis in a bone bed comprising:
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(a) a bone cement which is ready for use and is prepared for application; (b) a femoral prosthesis for implantation by cementation, wherein the prosthesis stem has a selected shape and a longitudinal borehole extending from a proximate end to a distal end for the transprosthetic application of the bone cement; and (c) a sheath comprising an elastic biocompatible polymeric material, which sheath is adapted in initial shape and dimensions to conform to the shape of the prosthesis stem, the sheath having pores which widen as the sheath is filed with bone cement introduced into the longitudinal bore hole of the prosthesis stem to expand the sheath outwardly to conform in shape and size to the inner surface of the bone bed. - View Dependent Claims (11)
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Specification