Geared instrument for tibial stem reaming or removal

Abstract

The present subject matter relates to a geared instrument. The geared instrument is configured to translate rotation about a first axis to rotation about a second axis. The geared instrument comprises a handle configured to rotate about the first axis. A translation gear is configured to couple to the handle. A stem is coupled to the translation gear and rotates in unison with the translation gear. The translation gear is configured to translate the rotation of the handle about the first axis to rotation of the stem about the second axis. The stem is configured to couple to a modular head.

1 - 20 . (canceled) 
     
     
         21 . An instrument, comprising:
 a housing defining a first opening and a second opening, and sized and configured to be received within a joint;   a handle configured to rotate about a first axis wherein the first opening is sized and configured to receive the handle therein;   a translation gear configured to be coupled to the handle and located within the housing, the translation gear configured to translate rotation of the handle about the first axis to rotation about a second axis; and   a stem coupled to the translation gear so as to extend longitudinally from the translation gear and through the second opening, the stem configured to receive a modular head, and wherein the stem is rotated about the second axis by the translation gear.   
     
     
         22 . The instrument of  claim 21 , wherein the handle comprises a handle gear configured to couple to the translation gear. 
     
     
         23 . The instrument of  claim 21 , wherein the translation gear comprises one of a bevel gear, a worm gear, a spiral bevel gear, or a hypoid gear. 
     
     
         24 . The instrument of  claim 21 , comprising an extender releasably coupled to the stem, the extender configured to receive the modular head. 
     
     
         25 . The instrument of  claim 21 , wherein the modular head comprises one of a reamer, a drill, or a stem remover. 
     
     
         26 . The instrument of  claim 21 , wherein the first axis is perpendicular to the second axis. 
     
     
         29 . A surgical system comprising:
 an instrument comprising
 a housing defining a vertical opening and a lateral opening, and sized and configured to be received within an joint; 
 a handle configured to rotate about a first axis wherein the vertical opening is sized and configured to receive the handle therein; 
 a translation gear configured to be coupled to the handle and located within the housing, the translation gear configured to translate rotation of the handle about the first axis to rotation about a second axis; 
 a stem coupled to the translation gear so as to extend longitudinally from the translation gear and through the lateral opening, the stem configured to receive a modular head, and wherein the stem is rotated about the second axis by the translation gear; and 
   a modular head coupled to the stem so as to allows the modular head to be switched without removing the geared instrument from within the joint.   
     
     
         30 . The instrument of  claim 29 , wherein the handle comprises a handle gear configured to couple to the translation gear. 
     
     
         31 . The instrument of  claim 29 , wherein the translation gear comprises one of a bevel gear, a worm gear, a spiral bevel gear, or a hypoid gear. 
     
     
         32 . The instrument of  claim 29 , comprising an extender releasably coupled between the stem and the modular head. 
     
     
         33 . The instrument of  claim 29 , wherein the modular head comprises one of a reamer, a drill, or a stem remover. 
     
     
         34 . The instrument of  claim 29 , wherein the first axis is perpendicular to the second axis.