Patent ID: 8398642
Filing Date: 2013-03-19
Classification: A61B,B23B,Y10T

Abstract:
1. A tool driver for driving multiple styles of surgical reamers, said driver comprising: a central shaft rotatable about a longitudinal axis and having a proximal end and a distal end; said central shaft comprises an axially facing pair of diametrical recesses perpendicular to one another at said distal end for receiving at least two different styles of surgical reamers only in an axial direction, said pair of diametrical recesses includes a first portion having a semicircular recess for receiving a cross-bar style reamer and a second portion having a recess base and shoulders connecting to sidewalls of said recesses for receiving a cross-bridge style reamer, wherein said semicircular recess and said recess base are in the same plane; a gripping device for releasably holding said surgical reamer assemblies in place in said pair of diametrical recesses, said gripping device comprising at least one pair of L-shape elements and a sleeve, said at least one pair of L-shape elements are pivotally mounted to adjacent opposite sides of said central shaft at said distal end and being pivotal between a retention position and an open position permitting direct axial removal and installation of the different styles of surgical reamers, each of said L-shaped gripping elements comprises a first section at a first end for pivotal mounting to said central shaft, a second opposing free end having an extension extending radially inward for capturing and holding different style reamers in said recesses, and an intermediate camming surface facing said longitudinal axis of said central shaft; and said sleeve is telescoped over said central shaft, wherein said sleeve being yieldably urged to hold said L-shape gripping elements in place; said central shaft further comprises an axial bore at said distal end and a plunger being axially received in said axial bore; said plunger interacting with said gripping device to urge said at least one pair of opposing L-shaped gripping elements from said retention position to said open position upon axial movement of said plunger in said bore, said plunger comprises a pair of cross semicircular recesses extending diametrically and perpendicular to one another at a distal end of said plunger and opens in an axial direction for abutting and stabilizing at least one reamer therein; wherein said plunger further comprises a shoulder that acts as a camming surface for interacting with said camming surface of said L-shape gripping elements and urges said at least one pair of L-shaped gripping elements from said retention position to said open position upon axial movement of said plunger in said bore; a spring being retained within said axial bore for yieldably urging said plunger in an axial direction relative to said central shaft and urging said L-shape gripping elements to said open position thereby releasing said at least two different styles of reamers, such that in said open position said two different styles of reamers are automatically released and ejected from said central shaft in an axial direction.