Dual reamer driver
View Patent ↗The disclosure illustrates a dual driver for surgical reamers in which either of a crossbridge and crossbar style reamers are axially inserted in the distal end of a central shaft for the reamer driver. A pair of L shaped grips are adapted to connect and disconnect the different style of reamers by the movement of an external sleeve biased towards the connection position. Movement of the sleeve away from the distal end allows an internal plunger to cam the grips to an open position and urge the appropriate reamer from the tool driver directly in an axial direction.
1. A tool driver for a style of surgical reamer for driving at least two different styles of surgical reamers, said driver comprising;
a central shaft rotatable about a longitudinal axis and having a proximal driver end and a distal end;
a reamer receiver carried by the distal end of the said shaft, wherein rotation of said central shaft about said longitudinal axis rotates said reamer receiver about said longitudinal axis, said reamer receiver having an axially facing pair of diametrical recesses perpendicular to one another for receiving the at least two different styles of surgical reamer, at least one of said pair of diametrical recesses includes an elongated counterbore extending diametrically and interrupted with a central circular recess oriented at right angle to the longitudinal axis of said central shaft;
a gripping device in said recess for releasably and securely holding said at least two different styles of surgical reamers in place in said recess, 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 style of surgical reamer,
each of said L-shaped gripping elements comprising 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 said at least two different style reamers in said recesses of said reamer receiver, 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 comprising an axial bore coaxially aligned with said central circular bore of said reamer receiver 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 having a surface at a distal end of said plunger for abutting and stabilizing said style of 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 within said axial bore relative to said central shaft and urging said L-shape gripping elements to said open position thereby releasing said style of reamer, such that in said open position said style of surgical reamer is automatically released and ejected from said central shaft and said reamer receiver in an axial direction;
wherein said at least two different styles of surgical reamers includes a crossbridge style reamer having an interface including a central circular disc and opposed tabs extending radially outward from said central disk configured to be seated in the central circular bore and the at least one of said pair of diametrical recesses of said reamer receiver.
2. The tool driver as claimed in claim 1 , wherein said at least one of the pair of diametrical recesses has rectangular cross sectional shape.
3. The tool driver as claimed in claim 2 , wherein said L-shaped elements are positioned to grip the radially extending tabs of said crossbridge reamer.
4. The tool driver as claimed in claim 1 , wherein the other one of said two different styles of surgical reamers includes a crossbar style reamer having an interface including a pair of circular cross section bars intersecting at right angles and wherein said receiver is configured to receive said crossbar style reamer.
5. The tool driver as claimed in claim 4 , wherein said pair of diametrical recesses of said reamer receiver have semi-circular cross sectional shape and intersects at the longitudinal axis of said central shaft for receiving said crossbar interface.
6. The tool driver as claimed in claim 5 , wherein said L-shaped elements are positioned to grip one of said intersecting bars.