Patent attributes
The present invention provides a compression and distraction shaft assembly used to apply compression and distraction to bones including vertebrae. Shaft A assembly and shaft B assembly are attached together via a polyaxial fulcrum. The polyaxial fulcrum allows all rotational degrees of freedom between shaft A assembly and shaft B assembly. Such fulcrum, during compression and distraction, does not impart ancillary stresses or motion to vertebrae. A hour glass shaped bore for engaging pliers is formed in approximately middle of both the shaft A assembly and the shaft B assembly. A distraction pliers having cylindrical tips is used to apply distraction to vertebrae. Once handles are pressed to impart appropriate amount of distraction to the vertebrae they are locked in this position. A compression pliers having cylindrical tips is used to apply compression to vertebrae. Once handles are pressed to impart appropriate amount of compression to the vertebrae they are locked in this position.
