초록 ▼

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 tu

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.

대표청구항 ▼

Apparatus for removing a fragment of a prosthesis from embedment in a bone, comprising a drill assembly including an elongated tubular support, a drill motor mounted at one end of said tubular support having a drive shaft extending therethrough, and drill chuck means mounted at the end of said shaft

Apparatus for removing a fragment of a prosthesis from embedment in a bone, comprising a drill assembly including an elongated tubular support, a drill motor mounted at one end of said tubular support having a drive shaft extending therethrough, and drill chuck means mounted at the end of said shaft projecting from said support; a drill guide assembly including an elongated tubular drill guide dimensioned to receive said tubular support in sliding relation, one end of said drill guide having a recessed end face configured to overlie and engage an end of the prosthesis, and means for limiting movement of said drill assembly relative to said drill guide end face; drill bit means for drilling a hole with an undercut ledge in the prosthesis; an extractor assembly including an extractor having an externally threaded body and an internally threaded tubular holder for said body; said extractor having an axial shaft to be received in said hole, said shaft having laterally projecting means at its distal end defining a ledge; said extractor having a longitudinal cam slot for guiding a follower wedge, said follower wedge being movable axially by the end face of said tubular holder to effect lateral movement of said shaft within said hole to place said ledges in interference relation; and said extractor assembly further including means for coupling to said extractor holder for imparting axial impact blows to said extractor.