Prosthetic wrist implant
AssigneeAvanta Orthopaedics, LLC
InventorsAmitava Gupta, David A. Leibel, William P. Cooney, III
Life of this patent
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Abstract
A wrist implant requires minimal resection of the distal radius and preserves the sigmoid notch and articulation with the head of the distal ulna. The wrist implant generally includes a radius portion, a carpal portion and a carpal ball. The wrist implant includes a primary articulation and a secondary rotational articulation. The primary articulation occurs between the radius portion and the carpal ball. The secondary articulation occurs between the carpal ball and the carpal portion.
Claims4
An implantable wrist prosthesis for implantation in a wrist, the wrist including a distal end of a radius presenting a substantially concave end surface contour and a carpus, the implantable wrist prosthesis comprising:
- a radius component comprising an articular receiver and an intramedullary stem extending from the articular receiver, the articular receiver having an inner receiver wall and further having an outer receiver wall that substantially conforms to the end surface at the distal end of the radius;
- a carpal plate having a bone interface surface;
- and a carpal piece articulated between the radius component and the carpal plate.
An implantable wrist prosthesis for implantation in a wrist, the wrist including a distal end of a radius presenting a substantially concave end surface contour and a carpus, the implantable wrist prosthesis comprising:
- a radius component comprising an articular cup and an intramedullary stem extending from the articular cup, the articular cup having an inner cup wall and further having an outer cup wall that is convexly curved such that the outer cup wall substantially conforms to the concave end surface contour at the distal end of the radius;
- a carpal plate having a bone interface surface;
- and a carpal ball articulated between the radius component and the carpal plate.
(canceled)
An implantable wrist prosthesis, comprising:
- a radius component, the radius component comprising an articular cup having an inner cup wall and further having an outer cup wall, and an intramedullary stem extending outwardly from the outer cup wall;
- a carpal component securable to a carpus;
- and
- a carpal ball articulated between the radius component and the carpal component, the carpal ball engaging into the inner cup wall and having at least two degrees of freedom relative to the articular cup, the carpal ball engaging the carpal component and having limited rotational freedom relative to the carpal component, the carpal ball engaging the carpal component via an interference fit between a generally spheroidal protrusion and a generally spheroidal socket.
Dependencies are inferred from the claim text.