A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
3/100
A61F 2/00 (2006.01) A61C 8/00 (2006.01) A61F 2/30 (2006.01) A61F 2/32 (2006.01) A61F 2/46 (2006.01) A61B 17/16 (2006.01) A61F 2/34 (2006.01) A61F 2/36 (2006.01) A61F 2/38 (2006.01)
Patent
CA 1237553
Prosthesis Fixation To Bone Abstract A two-part system for fastening an artifical joint component to bone with high early strength. The first part is a sleeve defining an external geometric pattern of projections which engage the bone when implanted. The sleeve performs none of the motion functions of the joint. In one embodiment the projec- tions are elongated and act in a self-broaching manner. In another embodiment the projections are threads which have an outside diameter which may vary in one or more tapers, to best achieve anchorage in cancellous bone in a prepared bony canal or cavity. The inner bore of the sleeve is a cone of a mechanically self-locking taper. The second part, which performs at least part of the motion function of the joint, has a mating external taper which is driven into the taper within the sleeve to be locked therein. The second part may of itself extend through the sleeve and into the prepared bony canal for additional stabilization and fastening. There is also provided a two-part system for fastening a dental prosthesis to the jawbone having as a first part, an externally threaded thin wall sleeve which resides entirely within the jawbone. The threads or other surface features are confined to the area near the point where the prosthesis enters the jawbone. The sleeve has integrally, or accommodates, a non- threaded stem which extends relatively deeply into the jawbone. The inner bore of the sleeve is a cone of a mechanically self-locking taper. The present invention is applicable to a prosthetic device for any body joint.
419882
Mccarthy Tetrault Llp
United States Medical Corporation
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