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US 8,506,639 B2Granted
Sliding patellar prosthesis
AssigneeDePuy Synthes Products, Inc.
InventorsAdam Iredell Hayden, Luke Aram, Dan Auger, Jordan Soonja Lee
Life of this patent
Estimating the term…
Abstract
An improved sliding patellar replacement component is provided. Various combinations of translational and/or rotational degrees of freedom are provided by boss and channel configurations between the base subcomponent of the replacement component and the articulating subcomponent of the patellar replacement component. In one embodiment, spin about one axis is restricted by a spin stop that may be movable to allow for ease of assembly. Alternatively, the boss and channel are configured to function as a spin stop. Assembly of the patellar replacement component in one embodiment is simplified by the provision of a boss assembly region.
Claims21
A patellar prosthesis comprising:
- a first subcomponent;
- a boss operably connected to the first subcomponent;
- and
- a second subcomponent movably connected to the first subcomponent with the boss, the second subcomponent comprising,
- a first side in opposition to the first subcomponent, the first side having (i) a channel opening to and encompassed by the first side, (ii) a boss retaining region operable to retain the boss within the channel when the boss is inserted into the channel by contacting the boss, and (iii) a boss assembly region operable to facilitate the insertion of the boss into the channel, by allowing the boss to pass through the boss assembly region for insertion of the boss into the channel,
- wherein:
- the boss comprises a stem and a head having a width;
- the channel has a first side and a second side, the second side spaced apart from the first side by a first distance;
- and
- the boss retaining region comprises a lip, a first section having a width and a second section having a width, the first section of the lip located on the first side of the channel and the second section of the lip located on the second side of the channel, the width of the head being greater than the first distance of the channel minus the width of the first section of the lip and minus the width of the second section of the lip.
7 more elements
A patellar replacement component base comprising:
- a generally planar bone contacting surface defining a first plane;
- a dome shaped contact surface for contacting a patellar articulating component and located generally opposite the bone contacting surface;
- and
- a boss having a stem extending from the dome shaped articulating component contact surface along an axis, the axis of the stem intersecting the first plane at an angle of other than 90 degrees.
1 more element
A patellar prosthesis comprising:
- a first subcomponent;
- a boss operably connected to the first subcomponent;
- and
- a second subcomponent movably connected to the first subcomponent with the boss, the second subcomponent comprising,
- a first side, the first side in opposition to the first subcomponent and having (i) a channel extending inwardly therefrom, (ii) a boss retaining region having a first configuration operable to retain the boss within the channel when the boss is inserted into the channel by contacting the boss, and (iii) a boss assembly region encompassed by the first side and having a second configuration operable to facilitate the insertion of the boss into the channel, the first configuration and the second configuration being different, wherein:
- the boss comprises a stem and a head having a width;
- the channel has a first side and a second side, the second side spaced apart from the first side by a first distance;
- and
- the boss retaining region comprises a lip, a first section having a width and a second section having a width, the first section of the lip located on the first side of the channel and the second section of the lip located on the second side of the channel, the width of the head being greater than the first distance of the channel minus the width of the first section of the lip and minus the width of the second section of the lip.
6 more elements
A patellar replacement component base comprising:
- a body defining (i) a generally planar bone contacting surface defining a first plane, and (ii) a dome shaped articulating component contact surface generally opposite the bone contacting surface;
- a stem extending outwardly from the dome shaped articulating component contact surface of said body along a line, the line of the stem intersecting the first plane at an angle of other than 90 degrees;
- and
- a head extending from said stem.
1 more element
A patellar replacement component base comprising:
- an integral body defining generally planar bone contacting surface defining a first plane, the integral body including a dome shaped contact surface generally opposite the bone contacting surface;
- and
- a stem extending outwardly from the dome shaped contact surface of said body in a direction away from the generally planar bone contacting surface along an axis, the axis of the stem intersecting the first plane at an angle of other than 90 degrees, the stem being integral with said body.
Dependencies are inferred from the claim text.