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Leaf-shaped shaft of a hip joint prosthesis for anchoring in the femur
| Details |
Inventors: Zweymuller, Karl;
Assignee: Plus Endoprothetik AG (Rotkreuz, CH)
Primary Examiner: Snow; Bruce
Assistant Examiner:
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear, LLP
Leaflike shaft (1) of a hip-joint prosthesis for anchoring in the femur, according to a towards a distal end (5) [sic], with a femur-anchoring section (1a, . . . 1i) having a long axis (A) and with a prosthesis neck (2), wherein the femur-anchoring section 1a, . . . 1i) has a substantially rectangular external contour in a plane perpendicular to the long axis (A), optionally with recesses in the side edges and/or at the corners. |
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DETAILED DESCRIPTION The invention includes the fundamental idea that the femur-anchoring section of the shaft is substantially rectangular in cross section, so that in simplified (ignoring the tapering toward the tip) terms it is constructed as a "four-edged" profile, in particular as oblique-cross profile H profile double-H or -comb profile rectangular hollow profile rectangular facet profile rectangular notch profile approximately trapezoidal profile (with or without recesses at the sides or in the interior) or the like.
These profiles all exhibit, to a greater or lesser extent, the property that in the space between the anchoring section of the shaft and the wall of the surgically created cavity spongy bone tissue forms, so that revascularization of the bone occurs.
The alternatives in accordance with the invention have the advantage that their periphery comprises substantially four edges, situated at the corners of a rectangle or trapezoid that extends perpendicular to the central axis of the shaft.
This basic shape of a shaft has been found in practice to be particularly advantageous for the revascularization of the bone tissue.
It has further been found that a predetermined overdimensioning of the side surfaces of the shaft in comparison to the "rasped" dimension ("null dimension")--with the exception of the edge regions, which should fit precisely--is advantageous in this respect, especially in the proximal section of the shaft.
With the further development in accordance with the invention the revascularization of the bone tissue is additionally promoted, while on one hand the necessary stability or solidity of the shaft is preserved, but on the other hand the intervening space between shaft and operation-cavity wall is enlarged, with the result that a greater amount of new spongiosa is formed.
Advantageous details of the prosthesis shaft in accordance with the invention are presented in the subordinate claims and explained in detail in the following description of exemplary embodiments with reference to the attached drawings, wherein
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