Patent ID: 8998912
Filing Date: 2015-04-07
Classification: A61B,A61F,F04C

Abstract:
1. A patella drill guide for use in preparing a resected patellar bone surface to receive a prosthetic patellar implant, the patella drill guide comprising: a handle having a proximal end, a distal end, a longitudinal axis extending between the proximal and distal ends, a top surface, a bottom surface and an aperture extending between the top and bottom surfaces; a base portion extending from the handle to a free distal end having a flat patella bone-facing surface, and a trial articulation surface opposite and spaced from the flat patella bone-facing surface, the trial articulation surface having a curved contour; an independent bone-gripping portion assembled with the base portion at the free distal end; a plurality of spaced drill guide bores extending from the trial articulation surface through the base portion to and through the flat patella bone-facing surface; a cantilever spring member having one end fixed to the handle and an opposite free distal end aligned with the flat patella bone-facing surface; a bone-gripping member at the free distal end of the cantilever spring member and having a portion extending outward from the cantilever spring member toward the flat patella bone-facing surface of the base portion; and a deflector engaging a portion of the cantilever spring member between the two ends of the cantilever spring and extending through the aperture in the handle; wherein: the cantilever spring member has a relaxed position wherein there is a first distance between the bone-gripping member of the cantilever spring member and the flat patella bone-facing surface of the base portion; the cantilever spring member has a deflected position wherein the bone-gripping member of the cantilever spring member is spaced a second distance away from the flat patella bone-facing surface of the base portion; the second distance is greater than the first distance; and activation of the deflector moves the bone-gripping member of the cantilever spring member from the relaxed position to the deflected position.