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US 9,750,613 B2Granted
Stabilized total ankle prosthesis
AssigneeWright Medical Technology, Inc.
InventorChristine M. Petteys
Life of this patent
Estimating the term…
Abstract
The present invention relates to a stabilized ankle prosthesis configured for use in patients with compromised soft tissue in the ankle. The prosthesis of the present invention is a two-component design comprising a stabilizing lip configured to constrain movement in the general direction of compromised soft tissue.
Claims16
An ankle prosthesis comprising:
- an attachment surface on a proximal portion adapted to fit into a recess in a resected tibia, and an articulation surface on a distal portion, the body having two side surfaces which angle toward each other such that the articulation surface is wider than the attachment surface;
- a talar component configured for attachment to a talus, comprising a flat attachment surface on a distal portion and an articulation surface on a proximal portion;
- wherein the articulation surface of the tibial component comprises a medial portion and a lateral portion, the medial portion having a first convex contour, the lateral portion having a second convex contour, wherein a first concave contour is located between the first and second convex contours;
- wherein the articulation surface of the talar component comprises a medial portion and a lateral portion, the medial portion having a second concave contour, the lateral portion having a third concave contour, wherein a third convex contour is located between the second and third concave contours, and the articulation surface of the talar component is configured to complement the articulation surface of the tibial component;
- and
- wherein the articulation surface of the talar component comprises a lip configured to maintain congruence of the articulation surface of the tibial component with the articulation surface of the talar component, wherein the lip comprises raised surfaces curving around each of the medial portion of the articulation surface of the talar component, the lateral portion of the articulation surface of the talar component, a posterior edge of the articulation surface of the talar component and an anterior edge of the articulation surface of the talar component, forming a cup-like contour.
3 more elements
An ankle prosthesis comprising:
- a tibial component configured for attachment to a tibia, comprising an attachment surface on a proximal portion of the tibial component and an articulation surface on a distal portion of the tibial component, wherein the articulation surface of the tibial component has a bicondylar contour comprising a medial portion and a lateral portion, the medial portion having a first convex contour, the lateral portion having a second convex contour, wherein a first concave contour is located between the first and second convex contours;
- a talar component comprising a proximal portion and a distal portion, wherein:
- the proximal portion of the talar component has an articulation surface and a trapezoid-shaped projection opposite the articulation surface,
- the distal portion of the talar component has an attachment surface configured for attachment to a talus, the distal portion of the talar component having a trapezoid-shaped groove opposite the attachment surface, the trapezoid-shaped groove configured to slidably receive the trapezoid-shaped projection of the proximal portion of the talar component,
- the articulation surface of the talar component is configured to complement the bicondylar contour of the tibial component and comprises a medial portion and a lateral portion, the medial portion having a second concave contour, the lateral portion having a third concave contour, wherein a third convex contour is located between the second and third concave contours, and
- the articulation surface of the talar component comprises a lip having raised surfaces curving around each of the medial portion of the articulation surface of the talar component, the lateral portion of the articulation surface of the talar component, a posterior edge of the articulation surface of the talar component and an anterior edge of the articulation surface of the talar component, forming a cup-like contour.
3 more elements
Dependencies are inferred from the claim text.