Humeral implant anchor system
AssigneeHowmedica Osteonics Corp.
InventorsBrian C. Hodorek, Kevin P. Knox, Thomas Bradley Edwards
Life of this patent
Estimating the term…
Abstract
A stemless humeral shoulder assembly having a base member and an anchor advanceable into the base member. The base member can include a distal end that can be embedded in bone and a proximal end that can be disposed at a bone surface. The base member can also have a plurality of spaced apart arms projecting from the proximal end to the distal end. The anchor can project circumferentially into the arms and into a space between the arms. When the anchor is advanced into the base member, the anchor can be exposed between the arms. A recess can project distally from a proximal end of the anchor to within the base member. The recess can receive a mounting member of an anatomical or reverse joint interface.
Claims17
A method for treating a shoulder joint, comprising:
- (a) accessing an end portion of a humerus;
- (b) preparing the end portion of the humerus with a recess;
- (c) inserting a base member of a stemless humeral implant into the recess at the end portion of the humerus, the base member including:
- a peripheral rim that encircles a first end of the base member,
- an inner member having an outside surface and an inside surface, the inside surface including an inner periphery of the base member,
- a second end that is disposed opposite the first end,
- a plurality of spaced apart arms projecting distally from the peripheral rim and joining together at the second end such that at least a portion of each arm of the plurality of spaced apart arms is separated from the inner member by a respective gap, each arm of the plurality of spaced apart arms including:
- an outer edge,
- first and second lateral surfaces extending from the outer edge toward the outside surface of the inner member, a plurality of openings extending through the first and second lateral surfaces and open toward the outside surface of the inner member, and
- an inner edge spaced apart from the outside surface of the inner member,
- wherein the first and second lateral surfaces of each of the plurality of spaced apart arms are separated by a thickness, extend from the second end of the base member toward the first end of the base member, and have a width measured in a radial direction that is greater than the thickness, and
- at least one flat surface extending between the peripheral rim and the inner member, the at least one flat surface disposed at an elevation distal of a proximal-most aspect of the peripheral rim;
- and
- (d) advancing a joint interface into a recess defined by the inner surface of the inner member of the base member.
A method, comprising:
- exposing an end portion of a humerus;
- preparing the end portion of the humerus for receipt of a stemless prosthesis;
- inserting a base member of the stemless prosthesis into the end portion of the humerus, the base member including:
- a first end and a second end, the first end including a peripheral rim that encircles the first end,
- a cylindrical member having an outside surface and an inside surface defining a recess disposed at a central portion of the base member,
- a plurality of spaced apart arms extending radially outward of the outside surface of the cylindrical member, each arm of the plurality of spaced apart arms including:
- an outer edge,
- first and second lateral surfaces extending from the outer edge toward the outside surface of the cylindrical member,
- a plurality of openings extending through the first and second lateral surfaces and open toward the outside surface of the cylindrical member, and
- an inner edge spaced apart from the outside surface of the inner member,
- wherein the first and second lateral surfaces of each of the plurality of spaced apart arms (i) are separated by a thickness, (ii) extend from the second end of the base member toward the first end of the base member, and (iii) have a width measured in a radial direction that is greater than the thickness, and
- at least one flat surface extending between the peripheral rim and the cylindrical member, the at least one flat surface disposed at an elevation distal of the proximal-most aspect of the peripheral rim;
- and
- coupling a joint interface to the base member.
Dependencies are inferred from the claim text.