Elbow joint prostheses
AssigneeTornier SAS
InventorsMatthew Victor Kartholl, Brad Alan Parker, William Matthew Kuester, Jackson R. Heavener, Kevin Alika Farley
Life of this patent
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Abstract
A radial head assembly is provided that includes a stem, a collar, a locking ring, and an articular member. The stem has a convex articular head on one end thereof. The locking ring has a ring wall, which has a ring opening. The ring wall has an angular outer surface and a slot configured to permit the ring wall to radially expand. The angular outer surface engages an angular portion of an interior surface of the collar. The articular member and the locking ring define an articular space within the collar. The articular space is configured to receive the convex articular head.
Claims29
A radial head assembly comprising:
- a stem comprising a convex articular head on one end thereof;
- a collar comprising a collar wall defining a first collar opening, a second collar opening, and a passage therethrough, the collar wall having an interior collar surface comprising an angular portion proximate to the first collar opening;
- a locking ring comprising a ring wall defining a ring opening, the ring wall having an angular outer surface and a slot configured to permit the ring wall to radially expand, the angular outer surface engaging the angular portion of the interior collar surface;
- an articular member comprising:
- a base having an outer rim and a first concave surface;
- and
- a projection extending from the base, the projection comprising a second concave surface disposed between the first concave surface and an end of the articular member opposite the first concave surface, the projection having a peripheral surface configured to engage the interior collar surface;
- wherein the articular member and the locking ring define an articular space within the collar, the articular space configured to receive the convex articular head.
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An articular assembly comprising:
- an articular portion configured to couple with a stem coupled with a first bone, the articular portion comprising:
- a concave surface disposed on the articular portion to face a second bone opposite the first bone;
- a collar comprising a collar wall defining a collar opening opposite the concave surface and an interior trapping surface proximate to the collar opening;
- a space extending from the collar opening into the interior of the collar;
- and
- a trapping member comprising a trapping member opening and a mating surface configured to engage the interior trapping surface;
- wherein the articular assembly has a configuration in which the interior trapping surface engages the mating surface to prevent the trapping member from expanding such that a head of a stem disposed in the articular space can be retained in the articular space.
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A surgical method comprising:
- attaching a distal portion of a stem to a first bone, the stem comprising an articular head on a proximal end of the stem;
- placing an opening of an articular assembly on the articular head, the articular assembly comprising:
- a concave surface disposed on the articular assembly opposite the opening to face a second bone opposite the first bone, a collar defining the opening, a space extending from the opening into the interior of the articular assembly, and an interior trapping surface proximate to the opening;
- and
- a trapping member disposed in the opening;
- expanding the trapping member;
- and
- advancing the articular head through the trapping member such that the articular head is disposed between the trapping member and the concave surface and the trapping member is disposed between the articular head and the interior trapping surface.
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Dependencies are inferred from the claim text.