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Safety of multi-channel stimulation implants: a single blocking capacitor per channel is not sufficient after single-fault failure.

Nonclercq, A; Lonys, L; Vanhoestenberghe, A; Demosthenous, A; Donaldson, N; (2012) Safety of multi-channel stimulation implants: a single blocking capacitor per channel is not sufficient after single-fault failure. Med Biol Eng Comput , 50 (4) pp. 403-410. 10.1007/s11517-012-0889-5.

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Abstract

One reason given for placing capacitors in series with stimulation electrodes is that they prevent direct current flow and therefore tissue damage under fault conditions. We show that this is not true for multiplexed multi-channel stimulators with one capacitor per channel. A test bench of two stimulation channels, two stimulation tripoles and a saline bath was used to measure the direct current flowing through the electrodes under two different single fault conditions. The electrodes were passively discharged between stimulation pulses. For the particular condition used (16 mA, 1 ms stimulation pulse at 20 Hz with electrodes placed 5 cm apart), the current ranged from 38 to 326 μA depending on the type of fault. The variation of the fault current with time, stimulation amplitude, stimulation frequency and distance between the electrodes is given. Possible additional methods to improve safety are discussed.

Type: Article
Title: Safety of multi-channel stimulation implants: a single blocking capacitor per channel is not sufficient after single-fault failure.
Location: United States
DOI: 10.1007/s11517-012-0889-5
Keywords: Electric Stimulation, Electrodes, Implanted, Electronics, Medical, Equipment Design, Equipment Failure, Equipment Safety, Humans, Prostheses and Implants
UCL classification: UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Surgery and Interventional Science (Division of)
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Surgery and Interventional Science (Division of) > Institute of Orthopaedics and Musculoskeletal Science
UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering
URI: http://discovery.ucl.ac.uk/id/eprint/1343049
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