Unicondylar knee implant
AssigneeAccin Corporation
InventorsJohn Kuczynski, Mikhail Kvitnitsky
Life of this patent
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Abstract
A unicondylar knee implant system according to one embodiment includes a unicondylar femoral knee component having a single sagittal radius, a tibial bearing component, and a tibial tray component having a self-locking keel. The unicondylar knee implant system also provides for a locking mechanism for securing the tibial bearing component onto the tibial tray component. The unicondylar knee system allows for a simplified surgical technique, complete interchangeability between sizes, and a more MIS compatible implant system.
Claims35
A unicondylar knee prosthesis comprising:
- a tibial bearing component including:
- a top portion having an articulating surface;
- and
- a bottom portion connected to the top portion;
- and
- a tibial tray component including:
- a tray member;
- and
- a self-locking keel connected to a distal surface of the tray member and including:
- a vertical keel section extending from the distal surface of the tray member;
- and
- a keel foot having a posterior slope and a posterior taper for securing the tibial tray component to a prepared tibia;
- and
- wherein the tibial tray component is constructed to be implanted into the prepared tibia and the tibial bearing component is attached to the tibial tray component.
A keel for a device comprising:
- a vertical keel section for extension from a surface of the device;
- and
- a keel foot connected to the end of the vertical keel section, wherein the keel foot is sloped and tapered.
A unicondylar femoral knee implant comprising:
- a bone engaging surface including:
- a distal surface;
- a posterior surface;
- a distal-to-posterior chamfer surface disposed between the distal surface and the posterior surface;
- and
- wherein the distal surface and the posterior surface are equiangular to the distal-to-posterior chamfer surface;
- and
- an articulating surface comprising a single sagittal radius of curvature from about 10 degrees of hyperextension to about 140 degrees of flexion.
A tibial knee prosthesis comprising:
- a tibial tray component including:
- a tray member including:
- a peripheral vertical rim on the tray member;
- a posterior lip extending from a posterior aspect of the peripheral vertical rim;
- and
- at least one latch extending from the peripheral vertical rim;
- a keel;
- and
- a tibial bearing component including:
- a top portion having an articulating surface;
- and
- a bottom portion connected to the top portion shaped to fit securely within the peripheral vertical rim of the tray member, including:
- a posterior wedge engaging the posterior lip;
- and
- at least one flexible catch engaging the at least one latch.
A unicondylar femoral knee implant system comprising:
- at least two unicondylar femoral knee implants each including:
- a distal bone engaging surface having an anterior end;
- a posterior bone engaging surface;
- a distal-to-posterior chamfer bone engaging surface disposed between the distal and the posterior bone engaging surface;
- and
- at least one peg extending from the distal bone engaging surface at a constant distance from the anterior end for the at least two unicondylar femoral knee implants.
Dependencies are inferred from the claim text.