Design Innovation

Design and Construction of a Portable Transcranial Magnetic Stimulation (TMS) Apparatus for Migraine Treatment

[+] Author and Article Information
Renaud Charlet de Sauvage

 University of Bordeaux 1, IMS, Site ENSCPB, UMR CNRS 5218, 16, Avenue Pey Berland, 33607, Pessac Cedex, Francerenaud.charlet@ims-bordeaux.fr

Anne Beuter, Isabelle Lagroye, Bernard Veyret

 University of Bordeaux 1, IMS, Site ENSCPB, UMR CNRS 5218, 16, Avenue Pey Berland, 33607, Pessac Cedex, France

Department of ECT and rTMS (directed by J. Tignol), Psychiatric Hospital Charles Perrens, 121 rue de la Béchade, 33076 Bordeaux, France.

J. Med. Devices 4(1), 015002 (Feb 04, 2010) (6 pages) doi:10.1115/1.4000616 History: Received January 12, 2009; Revised April 10, 2009; Published February 04, 2010; Online February 04, 2010

A portable transcranial magnetic stimulation (TMS) prototype was designed and constructed for use in clinical trials to manage the pain associated with migraine with aura. In this system, a half-sinusoid (optionally a full-sine) TMS pulse is delivered into a circular coil. The pulse triggering is controlled by a switch in the coil handle. The pulse intensity and polarity are adjustable. Measured pulse parameters (period 202μs, maximum magnetic field at coil center 0.7T) corresponded to expected values and were in the range described for commercially available TMS apparatus. The maximum current density, computed 3 cm below the coil using a simple model of brain anatomy, was approximately 1.9 times the motor threshold, thus ensuring a sufficient margin for reaching the neuronal threshold in the target area.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Portable TMS module, general view with power supply

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Figure 2

Waveform of the coil current at 20% of maximum module output

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Figure 3

(a) Schematic implantation of TMS module parts (top view) and (b) schematic layout of TMS module parts (front view)

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Figure 4

A volunteer being tested for motor threshold with the portable TMS module



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