Clamping patella drill guide
AssigneeDepuy (Ireland)
InventorsRichard Spencer Jones, Martin W. Roche, Abraham P. Wright
Life of this patent
Estimating the term…
Abstract
A patella drill guide includes a base with a flat patella bone-facing surface, a drill guide bore extending through the base, a cantilever spring member and a bone-gripping member. The cantilever spring member biases the bone-gripping member and the flat patella bone-facing surface toward each other. Flexing the cantilever spring member moves the bone-gripping member away from the flat patella bone-facing surface so that the drill guide can be placed on the patella. When the cantilever spring member is released, the patella is clamped between the bone-gripping member and the flat patella bone-facing surface. The drill guide may have sizing indicia and may be part of a kit including trial components to be mounted to the drill guide.
Claims10
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.
Dependencies are inferred from the claim text.