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US 12,575,943 B1Granted
Locking swivel patella clamp
AssigneeGlobus Medical, Inc.
InventorsRyan Frasca, Jason Zappacosta
Life of this patent
Estimating the term…
Abstract
A patella clamp includes a lockable swivel that is able to freely tilt from 1° to 30° in any direction and then be locked in that orientation. This ability to freely swivel will allow a user to align a resected surface of a patella parallel to the other end of the patella clamp to make the operative surfaces of the implant and the patella substantially parallel to each other.
Claims17
A patella clamp, comprising:
- first and second jaws, the first jaw adapted to engage a non-resected surface of a patella, the second jaw located opposite the first jaw and moveable relative thereto, the second jaw adapted to engage a patella implant configured to be clamped to a resected surface of the patella at a corresponding orientation relative to a reference plane;
- a lockable swivel connected to the first jaw of the clamp;
- a dish into which the lockable swivel is received;
- a spiked plate connected to the lockable swivel;
- a locking pin selectively actuatable to lock the lockable swivel relative to the dish;
- a retaining ring rotatably interconnected between the lockable swivel and the spiked plate to permit selective rotation of the spiked plate relative to the lockable swivel;
- wherein the locking pin is moveable between an unlocked position and a locked position, the unlocked position slidably retaining the lockable swivel relative to the dish and the locked position fixing the lockable swivel relative to the dish;
- wherein the lockable swivel comprises a star-shaped cut-out, the star-shaped cut-out having a center and arms dimensioned to slidably receive the locking pin therein, the arms extend radially outwardly from the center through predetermined arcs to define a locus of user-selectable fixation points on the lockable swivel, at least one of the fixation points orienting the lockable swivel and the spiked plate at a desired orientation relative to the reference plane, whereby when the patella is received on the spiked plate, the resected surface of the patella is configured to be aligned parallel to an opposing surface of the patella implant when received on the second jaw.
5 more elements
In a patella clamp having a patella side adapted to engage a non-resected surface of a patella and having a patella implant side opposite the patella side and moveable relative thereto, the patella implant side adapted to engage a patella implant configured to be clamped to a resected surface of the patella, at a corresponding orientation relative to a reference plane, the improvement to the patella clamp comprising:
- a lockable swivel connected to the patella side of the clamp;
- a dish into which the lockable swivel is received;
- a spiked plate connected to the lockable swivel;
- a locking pin selectively actuatable to lock the lockable swivel relative to the dish;
- a retaining ring rotatably interconnected between the lockable swivel and the spiked plate to permit selective rotation of the spiked plate relative to the lockable swivel;
- wherein the dish has a concave surface;
- wherein the lockable swivel has a corresponding convex, pivoting surface opposing the concave surface;
- wherein the locking pin is moveable between an unlocked position and a locked position, the unlocked position slidably retaining the lockable swivel relative to the dish and the locked position fixing the lockable swivel relative to the dish;
- wherein the lockable swivel extends to a circumferential edge;
- wherein the spiked plate is rotatably mounted to, and oriented outwardly from, the circumferential edge of the lockable swivel and is configured to be selectively engageable with the non-resected surface of the patella;
- wherein the dish has a bore defined in the concave surface and the pivoting surface has a swivel aperture aligned with the bore;
- wherein the locking pin has a locking pin shaft extending through the bore and the swivel aperture and terminating in a locking pin head, the locking pin head having a portion extending transversely relative to the locking pin shaft to define a flange;
- wherein the swivel aperture is defined by edges, the edges extending in at least one direction over a distance greater than a diameter of the locking pin shaft and less than at least one dimension of the flange, so that the edges of the swivel aperture are engageable by the flange;
- wherein the locking pin is further adapted so that, when in the unlocked position, the lockable swivel is slidable to a user-selectable orientation corresponding to an orientation of the patella implant by moving the swivel aperture relative to the locking pin shaft received therethrough;
- and
- wherein, the locking pin is further adapted so that when in the locked position, the lockable swivel is configured to be fixed in the user-selectable orientation.
13 more elements
Dependencies are inferred from the claim text.