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. Author manuscript; available in PMC: 2008 Jun 20.
Published in final edited form as: J Neurotrauma. 2007 Apr;24(4):657–673. doi: 10.1089/neu.2006.0011

FIG. 1.

FIG. 1

Design of an electromagnetic controlled cortical impact device for experimental traumatic brain injury. (A) Photograph of the impactor device mounted on the left arm of a stereotaxic device. Motorized drill with 5-mm trephine mounted on the right arm. (B) Schematic of the components of the impact system. Control signals from a Windows-based notebook computer running custom Matlab™ routines are fed through a digital-to-analog converter. The digital-to-analog converter output is sent to a servo amplifier. The servo amplifier transmits current from 72-V power supply to the impactor containing an electromagnetic voice coil. This voice coil drives the impactor. (C) Photograph of the impactor tip in the raised position. A laser-Doppler displacement sensor was used to measure velocity of the tip during the impact stroke.