Apparatus and method for removing a prosthesis embedded in skeletal bone

Abstract

A drill assembly includes a handle carrying a mount for a pneumatic drill motor, and an elongated tubular support enclosing an extended motor shaft which carries a drill bit chuck projecting from the end of that support. The drill assembly coacts with a drill guide assembly including an elongated tubular guide for receiving the tubular support in sliding relation, and having a rotary bearing at its lower end for rotationally supporting the drill bit. The lower end face is concave to enable seating on the prosthesis tip to be drilled. The drill guide assembly includes an offset handle and a stop clamp and depth gauge for coaction with the drill assembly handle to control the depth of drilling. An extractor assembly, for coaction with an undercut drilled hole in the prosthesis, includes an extractor having an externally threaded body and a tubular internally threaded T handle for that body. The body includes an axial shaft to be received in the hole with a lateral toe at the distal end defining a ledge. The extractor further includes an elongated cam slot for guiding a follower wedge, which wedge is moved axially relative to the extractor by the end of the tubular holder to effect lateral displacement of the shaft to place the toe within the undercut recess of the hole. A slide hammer, coupled to the extractor holder, imparts axial blows to the assembly to extract the prosthesis tip.