Article (Scientific journals)
Controllable pulse parameter transcranial magnetic stimulator with enhanced circuit topology and pulse shaping
Peterchev, Angel; D'Ostilio, Kevin; Rothwell, John et al.
2014In Journal of Neural Engineering, 11 (5)
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Keywords :
TMS; Neuroscience; Motor system
Abstract :
[en] Abstract. Objective. This work aims at flexible and practical pulse parameter control in transcranial magnetic stimulation (TMS), which is currently very limited in commercial devices. Approach. We present a third generation controllable pulse parameter device (cTMS3) that uses a novel circuit topology with two energy-storage capacitors. It incorporates several implementation and functionality advantages over conventional TMS devices and other devices with advanced pulse shape control. cTMS3 generates lower internal voltage differences and is implemented with transistors with lower voltage rating than prior cTMS devices. Main results. cTMS3 provides more flexible pulse shaping since the circuit topology allows four coil-voltage levels during a pulse, including approximately zero voltage. The nearzero coil voltage enables snubbing of the ringing at the end of the pulse without the need for a separate active snubber circuit. cTMS3 can generate powerful rapid pulse sequences (< 10 ms inter pulse interval) by increasing the width of each subsequent pulse and utilizing the large capacitor energy storage, allowing the implementation of paradigms such as paired-pulse and quadripulse TMS with a single pulse generation circuit. cTMS3 can also generate theta (50 Hz) burst stimulation with predominantly unidirectional electric field pulses. The cTMS3 device functionality and output strength are illustrated with electrical output measurements as well as a study of the effect of pulse width and polarity on the active motor threshold in 10 healthy volunteers. Significance. The cTMS3 features could extend the utility of TMS as a research, diagnostic, and therapeutic tool.
Disciplines :
Neurology
Author, co-author :
Peterchev, Angel
D'Ostilio, Kevin ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Rothwell, John
Murphy, David
Language :
English
Title :
Controllable pulse parameter transcranial magnetic stimulator with enhanced circuit topology and pulse shaping
Publication date :
September 2014
Journal title :
Journal of Neural Engineering
ISSN :
1741-2560
eISSN :
1741-2552
Publisher :
Institute of Physics Publishing, United Kingdom
Volume :
11
Issue :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 August 2014

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