This paper describes the design of a compact, lightweight CT-compatible, drill-press that is designed to be used in either a hand-held or stand-alone mode to assist with percutaneous bone based interventions. Previous medical drilling tools that have been developed have a metal structure and typically have one actuator for advancing the drill (feed) and another for rotating it (speed). After defining the device functional requirements and specifications, a deterministic design process was followed to generate several design concepts that were then evaluated based on their ability to satisfy the functional requirements. A final concept that uses a custom screw-spline to achieve helical motion of a shaft that is attached to a standard orthopedic drill was selected for prototyping. The design uses a single actuator to drive both the screw and spline nuts through two different gear ratios, resulting in a fixed ratio between the feed and speed. Apart from the motor which is placed away from the central drill axis, the device is largely made from plastic materials. A custom experimental setup was developed that enabled drilling into bone inside a CT scanner to be examined. Results showed that the device was successfully able to penetrate thick cortical bone and that its structure did not appreciably distort the medical images.
CT-Compatible Medical Drilling Stylet
Manuscript received March 8, 2010; final manuscript received April 10, 2011; published online October 11, 2012. Assoc. Editor: Paul A. Iaizzo.
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Walsh, C. J., Meskers, A. J. H., Slocum, A. H., and Gupta, R. (October 11, 2012). "CT-Compatible Medical Drilling Stylet." ASME. J. Med. Devices. December 2012; 6(4): 041001. https://doi.org/10.1115/1.4007280
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