Shoulder trial with flexure
AssigneeHowmedica Osteonics Corp.
InventorAndrew J. Nelson
Life of this patent
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Abstract
Disclosed herein is a humeral head trial, a system for humeral trialing, and a method for removing a humeral head trial from a humeral stem. The humeral head trial may include a first portion, a second portion, and a post extending from the second portion. The first portion may define a convex articular surface with a movable surface substantially flush with the convex articular surface. The post may define a first length in a first configuration and a second length in a second configuration. The first length may be greater than the second length. The post may change from the first configuration to the second configuration by moving the movable surface with respect to the convex articular surface.
Claims20
A humeral trial comprising:
- a first portion defining an articular surface, the articular surface including a movable surface substantially flush with the articular surface;
- a second portion defining a flat surface, and
- a post extending from the second portion, the post defining a first length in a first configuration and a second length in a second configuration, the first length being greater than the second length,
- wherein the post is configured to transition from the first configuration to the second configuration upon movement of the movable surface with respect to the articular surface.
A humeral trialing system comprising:
- a humeral trial including a first portion defining an articular surface, the articular surface including a movable surface substantially flush with the articular surface, a post extending from a second portion, the post defining a first length in a first configuration and a second length in a second configuration, the first length being larger than the second length, the post is configured to transition from the first configuration to the second configuration upon movement of the movable surface;
- and
- a prosthetic humeral stem having an opening,
- wherein the humeral trial is adapted to be secured to the humeral stem when the post is in the opening of the humeral stem in the first configuration, the first length being equal to or larger than an opening length such that the post forms an interference fit with the opening in the first configuration.
A method of removing a humeral trial from a prosthetic humeral stem, a post of the humeral trial being secured within an opening of the humeral stem, the method comprising:
- moving a movable surface of an articular surface of the humeral trial to transition a post from a first configuration to a second configuration, the movable surface being substantially flush with the articular surface in the first configuration, the post extending from a second portion of the humeral trial, the post defining a first length in the first configuration and a second length in the second configuration, the first length being larger than the second length, the second length being smaller than an opening length;
- and
- removing the humeral trial from the humeral stem while the post is in the second configuration.
Dependencies are inferred from the claim text.