Expandable proximal reamer

Abstract

A kit for reaming a portion of a cavity for use in implanting a prosthesis. The kit includes a distal reamer for reaming a distal portion of the long bone and a proximal reamer for reaming a proximal portion of the long bone. The kit further includes a pilot shaft for insertion into a reamed distal portion and attachment to the proximal reamer during the reaming of the proximal portion. At least one of the distal reamer, proximal reamer, and pilot shaft is expandable, such that at least one of the distal reamer, proximal reamer, and pilot shaft includes a body having a plurality of slots, a plurality of cutting edges extending through the slots, and an actuator rod including a gear for engaging the plurality of cutting edges such that when the actuator rod is turned in one direction, the plurality of cutting edges expands outwardly through the slots.

1 . A kit for reaming a portion of a long bone cavity for use in implanting a joint prosthesis, the reamers for cooperation with portions of an orthopaedic implant component, the kit comprising:
 a distal reamer for reaming a distal portion of the long bone;   a proximal reamer for reaming a proximal portion of the long bone; and   a pilot shaft for insertion into a reamed distal portion and attachment to the proximal reamer during the reaming of the proximal portion;   wherein at least one of the distal reamer, proximal reamer, and pilot shaft is expandable, such that the at least one of the distal reamer, proximal reamer, and pilot shaft includes a body having a plurality of slots, a plurality of cutting edges extending through the slots, and an actuator rod including a gear for engaging the plurality of cutting edges such that when the actuator rod is turned in one direction, the plurality of cutting edges expands outwardly through the slots.   
     
     
         2 . The kit of  claim 1 , wherein the expandable body is cone-shaped including a proximal region and a distal region and the diameter of the proximal region of the reamer is expanded more relative to the distal region. 
     
     
         3 . The kit of  claim 1 , wherein the gear of the actuator rod engages the cutting edges such that when the actuator rod is turned in an opposite direction the cutting edges retract into the slots. 
     
     
         4 . The kit of  claim 1 , wherein the gear of the actuator rod is a long gear that extends the length of each of the plurality of cutting edges and engages a plurality of ridges on the plurality of cutting edges. 
     
     
         5 . The kit of  claim 4 , wherein the plurality of cutting edges include a cutting side and a ridge side such that the ridge side includes the ridges. 
     
     
         6 . The kit of  claim 1  wherein each of the distal reamer, proximal reamer, and pilot shaft is expandable.