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US 2026/0102256 A1Published application
Multiaxial modular tibia stems
AssigneeWright Medical Technology, Inc.
InventorsSteven L. HADDAD, Gary W. LOWERY, Jesse G. MOORE
Life of this patent
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Abstract
Provided are tibia stem components of ankle replacement prosthesis that are designed to engage dense tibia bone to reduce implant migration over long term.
Claims24
A prosthesis, comprising:
- a tibia stem component comprising a leading end, a trailing end, and a longitudinal axis defined therethrough;
- and
- a tibia tray component configured to be attached to a prosthetic joint articulating surface,
- wherein the tibia tray component extends from the trailing end of the tibia stem component,
- wherein the tibia stem component is sized and configured to be disposed in an intramedullary canal formed in a tibia,
- wherein the tibia stem component is divided into two or more retractable members by longitudinal slits, extending from the leading end of the tibia stem component and partially toward the trailing end, formed in the tibia stem, whereby each of the two or more retractable members comprise a proximal end and a distal end, wherein their proximal ends are joined at the trailing end of the tibia stem component and their distal ends are freely moveable,
- wherein the two or more retractable members are configured to be controllably movable from a retracted position and be extended outward and away from the longitudinal axis, wherein in the retracted position, the two or more retractable members are parallel to the longitudinal axis and do not extend outward, and
- wherein when the tibia stem component is disposed in the intramedullary canal and the two or more retractable members are extended outward, the two or more retractable members engage the intramedullary canal's surrounding bone and enhance anchoring the tibia stem within the intramedullary canal.
5 more elements
An ankle prosthesis, comprising:
- a tibia stem component comprising a leading end, a trailing end, and a longitudinal axis defined therethrough;
- and
- a tibia tray component comprising a surface defining a reference plane,
- wherein the tibia stem component and the tibia tray component are modular and the tibia tray component and the trailing end of the tibia stem component are configured to form a joint wherein the tibia stem component's relative angle with respect to the reference plane can be adjusted so that the longitudinal axis forms an angle θ with an orthogonal of the reference plane, wherein the angle can be between 0 degrees up to and including 40 degrees,
- wherein the tibia stem component is sized and configured to be disposed in an intramedullary canal formed in a tibia,
- wherein the tibia stem component comprises:
- two or more retractable members configured to be controllably movable from a retracted position and be extended outward and away from the longitudinal axis,
- wherein in the retracted position, the one or more retractable members are contained substantially within the tibia stem component, and
- wherein when the tibia stem component is disposed in the intramedullary canal and the two or more retractable members are extended outward, the one or more retractable members engage the intramedullary canal's surrounding bone and enhance anchoring the tibia stem within the intramedullary canal.
6 more elements
An ankle prosthesis, comprising:
- a tibia stem component comprising a leading end, a trailing end, and a longitudinal axis defined therethrough;
- and
- a tibia tray component comprising a surface defining a reference plane,
- wherein the tibia stem component and the tibia tray component are modular and the tibia tray component and the trailing end of the tibia stem component are configured to form a joint wherein the tibia stem component's relative angle with respect to the reference plane can be adjusted so that the longitudinal axis forms an angle θ with an orthogonal of the reference plane, wherein the angle can be between 0 degrees up to and including 40 degrees,
- wherein the tibia stem component is sized and configured to be disposed in an intramedullary canal formed in a tibia,
- wherein the tibia stem component comprises two or more modular components that are stacked together.
3 more elements
Dependencies are inferred from the claim text.