Design Analysis

Extensive screw testing and research was conducted to source a motor that would provide sufficient torque to properly insert pedicle screws. The prototype nature of this project called for a 3D printed design execution, but the housing was designed with ease of CNC machining in mind for future manufacturing. Tolerance analysis was conducted on the top level assembly to ensure that parts would mate and function correctly. Screw engagement and wall thickness calculations were computed to ensure that the housing could handle the shear stresses the motor would create while seating pedicle screws.

Design Background

The pedicle screw drill is an externally powered hand piece to be used in spinal rod fixation surgeries. This hand piece was designed to alleviate surgeon fatigue during Pedicle screw insertion.

Design Concepts

The prototype was kept simple, designed without any sealing technology. After surgical research, including measuring torque needed to drive pedicle screws, a motor was sourced, the specifications of which drove the design of the hand piece housing, trigger, and power connector. An adapter at the front of the motor was created to interface with bits that drive standard pedicle screws.