Joint resurfacing prosthetic implant system

摘要

A joint resurfacing prosthetic implant system is disclosed having an anatomically-shaped implant to replace a joint at a pedal digit or finger, including a head having an elliptical bearing surface disposed for engaging the end of an adjacent bone and a seating surface opposite the bearing surface, an elongated stem extending distally from the seating surface, and a flange on the circumference of the device and extending distally from the seating surface. The flange includes one or more portals and a removed section configured to avoid impinging upon a tendon during and after implantation of the prosthetic. A specialized tool is also provided to facilitate the resection of the bone for implantation. The specialized tool includes an elliptical template having a cutting edge and a center insert that is sized and configured to match a reamer used to bore into the bone for insertion of the implant.

主权项

1. A prosthetic implant system comprising:
a joint resurfacing prosthetic comprising
an elliptical head having an upper surface and a planar lower surface, and an outer edge extending around a circumference of the upper and planar lower surfaces, said elliptical head having a major ellipse axis and a minor ellipse axis;a flange extending distally from said planar lower surface, said flange having a proximal edge affixed to said planar lower surface and a distal edge opposite said proximal edge and having a uniform width from said proximal edge to said distal edge throughout a full length of said flange, said flange defining an exterior, circumferential sidewall of said elliptical head extending circumferentially around said planar lower surface of said elliptical head from a first end on a first side of said minor ellipse axis and terminating at a second end on a second side of said minor ellipse axis opposite said first side, such that an open portion extends along said planar lower surface between said first end and said second end, and said flange having at least one portal extending through said sidewall, wherein said portal is positioned along said sidewall to allow viewing through said portal of contact between said planar lower surface of said elliptical head and a bone in which said prosthetic is implanted after said prosthetic is fully seated in said bone; andan elongated stem extending distally from said planar lower surface of said head.