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DESIGN INNOVATION PAPER

Self-Cooling Cavity Burs for Surgical Drills

[+] Author and Article Information
Calvin C. Silverstein

 CCS Associates, 1313 Chartwell Drive, Pittsburgh, PA 15241

J. Med. Devices 1(4), 293-296 (Oct 26, 2007) (4 pages) doi:10.1115/1.2815330 History: Received February 04, 2007; Revised October 26, 2007

In a self-cooled drill, an especially designed bur is used to transport heat generated at the cutting edge into the handpiece, where it is dissipated into an air heat sink. The bur contains a sealed cavity partially filled with water, which transports heat via the principle of rotating heat pipe technology. The heat transport capability of burs fitted out as rotating heat pipes was established. A conceptual design for a representative bur was prepared, based on surgical drill sculpting criteria. It appears that a self-cooled surgical drill for sculpting can limit bone temperatures below levels for the initiation of thermal damage in bone, nerve, and brain tissue, without the need to employ an externally applied coolant.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of rotating heat pipe cavity bur

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Figure 2

Effect of heat transport rate on distribution of water film thickness

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Figure 3

Influence of cavity water content on idealized heat generation rate is centrifugal pumping limit and minimum rotational speed also plotted as a function of speed for peak heating rates of 4W and 8W

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Figure 4

Heat sink section of self-cooled drill

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Figure 5

Conceptual design of cavity bur for self-cooled drill

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