Cylindrical hemi-lunar parallel array threaded disc prosthesis

Details Cylindrical hemi-lunar parallel array threaded disc prosthesis Cylindrical hemi-lunar parallel array threaded disc prosthesis

A - Human Necessities

61

F

A61F 2/44 (2006.01) A61F 2/30 (2006.01) A61F 2/00 (2006.01) A61F 2/46 (2006.01)

Patent

CA 2342629

A small profile, cylindrically or conically shaped prosthetic disc device (20) is provided. The device housing is comprised of two longitudinally split hollow halves (22, 24), between which is contained a hemi-lunar shaped resilient body (41) which may be of a polymeric type, or it may contain hydrogel. This hemi-lunar disc lies in concave surfaces (51) located on the interior of each side of the split cylindrical housing. The housing halves (22, 24), even under maximum physiological loads, do not contact one another directly. Threads (31) on the exterior surface (30) of the cylindrical housing (20) facilitates insertion, and retention in theprepared bone opening.

Cette prothèse discale (20), de forme cylindrique ou conique, à profil mince, comprend un logement fendu longitudinalement et présentant deux moitiés creuses (22, 24) entre lesquelles on a disposé un corps souple (41), de forme hémisphérique, lequel peut être du type polymère ou peut contenir un hydrogel. Ce corps hémisphérique repose sur des surfaces concaves (51) situées à l'intérieur de chaque côté du logement cylindrique divisé en deux moitiés (22, 24), lesquelles, même sous des charges physiologiques maximales, n'entrent pas en contact direct l'une avec l'autre. Des filetages (31) sont ménagés sur la surface extérieure (30) du logement cylindrique (20) et facilitent l'insertion de la prothèse et sa rétention dans l'ouverture préparée dans l'os.

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