Bone rasp for a femur head prosthesis
AssigneeSulzer Orthopedics Inc.
InventorsLorenzo Spotorno, Markus Lechner
Life of this patent
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Abstract
A bone rasp has an elongate body which tapers in the distal direction with first cutting ribs which extend transversely to the longitudinal axis of the body and are arranged in parallel graduations at a first spacing along the longitudinal axis and with second cutting ribs which are formed in parallel graduations at a second spacing at the body. The first and second cutting ribs have a different depth of cut in order to ablate different amounts.
Claims14
A bone rasp for a femur head prosthesis comprising an elongate body which tapers in a distal direction, side surfaces of which form a substantially rectangular cross-section, and comprising a plurality of first cutting ribs which extend transversely to the longitudinal axis of the body and are arranged in parallel graduations at a first spacing along the longitudinal axis, wherein second cutting ribs are formed in parallel graduations at a second spacing at most at three side surfaces of the body, with the first and second cutting ribs having a different depth of cut in order to ablate different amounts.
A prosthesis system consisting of a bone rasp, the bone rasp comprising an elongate body which tapers in a distal direction, side surfaces of which form a substantially rectangular cross-section, the system further comprising a femur head prosthesis with longitudinal ribs, which is provided for an insertion after the rasping of a bone bed, whereby the rasp is provided with an under-dimensioning of 20% to 70% of the rib height in regions in which the prosthesis has longitudinal ribs.
A bone rasp for a femur head prosthesis comprising an elongate body which at all sides tapers continuously in a distal direction, side surfaces of which form a substantially rectangular cross-section, and comprising a plurality of first cutting ribs which extend transversely to the longitudinal axis of the body and are arranged in parallel graduations at a first spacing along the longitudinal axis, comprising a section at the distal end which has a smooth surface and which takes about one quarter or more of the length of the elongate body and comprising at a proximate end of the elongate body a posterior and anterior side each having a section with a smooth surface for compressing bone tissue.
Dependencies are inferred from the claim text.