Expandable acetabular reaming system

An acetabular reaming system for use in hip replacement surgery, comprising:

• a reamer head having a convex forward end attached to a base plate defining an interior space therebetween, said forward end having a plurality of apertures extending therethrough;
• a bladder mounted to said base plate within said interior space, said bladder being concentric to and spaced from said forward end of said reamer head so as to form a reservoir adapted to collect surgical waste material;
• a plurality of cutter blades mounted to said bladder, each blade positioned thereon in correspondence with one of said apertures;
• and
• a tubular air cylinder depending from said base plate including an open top in communication with said bladder and a shaft movable within said cylinder adapted to incrementally inflate or deflate said bladder upon a movement of said shaft, whereby said blades are projected through said corresponding apertures when said bladder is incrementally inflated and said blades are retracted through said corresponding apertures when said bladder is incrementally deflated.

An acetabular reaming system for use in hip replacement surgery, comprising:

• a cutter head having a convex forward end attached to a base plate and defining an interior space therebetween, said forward end having a plurality of apertures extending therethrough;
• a framework having a pair of elongate support members depending from said base plate and having a socket extending between distal ends of said support members relative to said cutter head;
• a flexible bladder mounted within said interior space and spaced from said forward end of said cutter head so as to form a reservoir adapted to collect surgical waste material;
• a plurality of cutter blades attached to said bladder, each blade positioned to correspond with a respective one of said apertures;
• an air cylinder mounted to said base plate and extending within said framework, said base plate having a central aperture therethrough for communicating said air cylinder with said bladder;
• means for selectably actuating said air cylinder for incrementally inflating or deflating said bladder, whereby said blades extend incrementally through said respective apertures as said bladder is inflated and retract incrementally through said apertures as said bladder is deflated;
• and
• a drive shaft having a forward end adapted to be coupled to said socket and a rearward end adapted for rotation by a driver, whereby said cutter head is rotated upon a rotation by the driver when said forward end is coupled to said socket.