Patent ID: 9078758
Filing Date: 2015-07-14
Classification: A61B,A61F

Abstract:
1. An implant for carpal hemiarthroplasty comprising: an articular component having a convex articular surface having a first curvature in a first direction defined by a major radius of curvature and a second curvature in a second direction perpendicular to the first direction defined by a minor radius of curvature, the major radius of curvature being larger than the minor radius of curvature, wherein the convex articular surface is shaped to conform to an unresected distal end of a radius bone such that the first direction corresponds to a ulnar-radial direction and the second direction corresponds to a dorsal-palmar direction, wherein the first curvature is selected to emulate a curve traced by a proximal portion of a scaphoid-lunate complex during normal articulation of a human wrist in radial and ulnar deviation and the second curvature is selected to emulate a curve traced by the proximal portion of the scaphoid-lunate complex during normal articulation of the human wrist in flexion and extension; a bearing component rigidly fixed to the articular component opposite the convex articular surface and having a bearing surface; and a carpal plate rotatably coupleable to the bearing component having a proximal surface and a distal surface, the proximal surface having a contour substantially conforming to the bearing surface, wherein the articular component defines a concavity opposite the convex articular surface, and wherein the articular component further includes a lip surrounding the concavity; wherein a proximal portion of the bearing component is received in the concavity, and wherein the bearing component includes a flange abutting the lip; and wherein no component of the implant is configured to be fixed to or inserted into the radius bone and/or an ulna bone.