Modular rotational device for torsionally stabilizing an endoprosthesis

A modular rotational device for torsionally stabilizing endoprosthesis devices, the device comprising:

• a first coupler (302) including an elongated stem (104) extending therefrom;
• a housing having a proximal end (110) and a distal end (112) with an axial bore therethrough;
• a proximal sleeve (108) positioned within the housing proximal end axial bore, the proximal sleeve having an axial bore therethrough for receiving the elongated stem, the proximal sleeve reducing the rotational friction of the elongated stem with respect to the housing proximal end;
• a distal sleeve (114) positioned within the housing distal end axial bore, the distal sleeve having an axial bore therethrough for receiving the elongated stem;
• the distal sleeve reducing the rotational friction of the elongated stem with respect to the housing distal end;
• wherein the distal sleeve is of a unitary construction and formed from a friction reducing biocompatible polymer extending coaxially along the elongated stem;
• a distal fastener (118) for positively engaging the elongated stem within a distal end cavity to retain the stem within the housing distal end;
• and
• a second coupler (304) on the distal housing end, further including a lobe ring (116) housed within a cavity in the second coupler to restrict the rotation of the first coupler relative to the second coupler, the lobe ring having ramps adjacent a lobe stop providing a gradual stop to rotation,
• the first coupler and the second coupler each adapted to accept one of the endoprosthesis devices, the first coupler rotatable with respect to the second coupler post-fixation within a patient.