Hip joint prosthesis
AssigneesPaulo Gallinaro, Giacomo Masse
InventorsMartin Elloy, Paulo Gallinaro, Giacomo Masse
Life of this patent
Estimating the term…
Abstract
A hip prosthesis having a stem (1) for introduction into the medullary cavity of a femur (13) and a head (2) which replaces a natural femoral head is characterized in that a plate-like anchoring member (3) is movably mounted at or near to the proximal end. The anchoring member is movable from an inoperative position in which it is housed within the general confines of the stem for the purpose of introducing the stem into the medullary cavity, to an operative position in which the member projects laterally of the stem to engage and anchor itself in adjacent cancellous bone.
Claims10
A hip prosthesis comprising a stem having a distal end for introduction into a medullary cavity of a femur and a proximal end, a head connected to the proximal end at a first point on the stem in a direction generally perpendicular to the anterior/posterior plane of the stem, and serving to replace a natural femoral head, said stem having a slot formed therein at the proximal end thereof at a second point generally diametrically opposite said first point;
- an anchoring plate, said plate being substantially flat and broad and dimensioned to be movably mounted in said slot;
- and
- positioning means formed in the stem adjacent the proximal end and operatively connected to said slot,
- whereby said plate may be moved from an inoperative position, a position where the plate is housed in the slot substantially within the general confines of the stem for introducing the stem into the medullary cavity, to an operative position by coupling a positioning drive means to said positioning means thereby operatively displacing the plate generally radially in a unidirectional outward operative position in which it projects laterally from the stem to engage and anchor itself in an adjacent cancellous bone of the trochanter.
Dependencies are inferred from the claim text.