Abstract
Surface Functional Electrical Stimulation (FES) requires high stimulation voltages. A step-up transformer in the output stage of the stimulation circuit is often used. In the present technical paper a voltage controlled current source (VCCS) is presented as an alternative to the transformer coupling. Two (master-slave) coupled transconductance amplifiers (TAs)-in series with pre-charged capacitors-are used to drive the output current. After each stimulation pulse the capacitors are recharged to a high voltage by a switch mode power supply (SMPS). A multiplexer in the output stage is used to provide biphasic output. Output rise-time (10-90%) was less than 2 μs at 100 mA output. Biphasic charge balanced stimulation current can be produced with a net current to ground of less than 20 nA, thus virtually separated from ground. The circuit permits recording of the volitional myoelectric signal from the stimulated muscle. It is part of a portable myoelectrically controlled FES system powered by 2 AA batteries and currently used in clinical trials.
| Original language | English |
|---|---|
| Pages (from-to) | 1032-1037 |
| Number of pages | 6 |
| Journal | Medical Engineering and Physics |
| Volume | 31 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Oct 2009 |
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Keywords
- Battery powered
- Biphasic stimulation
- Functional Electrical Stimulation
- Myoelectric signals
- Portable
- Stimulation artifacts
- Stimulation circuit
ASJC Scopus subject areas
- Biomedical Engineering
- Biophysics
Cite this
Battery powered neuromuscular stimulator circuit for use during simultaneous recording of myoelectric signals. / Thorsen, Rune; Ferrarin, Maurizio.
In: Medical Engineering and Physics, Vol. 31, No. 8, 10.2009, p. 1032-1037.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Battery powered neuromuscular stimulator circuit for use during simultaneous recording of myoelectric signals
AU - Thorsen, Rune
AU - Ferrarin, Maurizio
PY - 2009/10
Y1 - 2009/10
N2 - Surface Functional Electrical Stimulation (FES) requires high stimulation voltages. A step-up transformer in the output stage of the stimulation circuit is often used. In the present technical paper a voltage controlled current source (VCCS) is presented as an alternative to the transformer coupling. Two (master-slave) coupled transconductance amplifiers (TAs)-in series with pre-charged capacitors-are used to drive the output current. After each stimulation pulse the capacitors are recharged to a high voltage by a switch mode power supply (SMPS). A multiplexer in the output stage is used to provide biphasic output. Output rise-time (10-90%) was less than 2 μs at 100 mA output. Biphasic charge balanced stimulation current can be produced with a net current to ground of less than 20 nA, thus virtually separated from ground. The circuit permits recording of the volitional myoelectric signal from the stimulated muscle. It is part of a portable myoelectrically controlled FES system powered by 2 AA batteries and currently used in clinical trials.
AB - Surface Functional Electrical Stimulation (FES) requires high stimulation voltages. A step-up transformer in the output stage of the stimulation circuit is often used. In the present technical paper a voltage controlled current source (VCCS) is presented as an alternative to the transformer coupling. Two (master-slave) coupled transconductance amplifiers (TAs)-in series with pre-charged capacitors-are used to drive the output current. After each stimulation pulse the capacitors are recharged to a high voltage by a switch mode power supply (SMPS). A multiplexer in the output stage is used to provide biphasic output. Output rise-time (10-90%) was less than 2 μs at 100 mA output. Biphasic charge balanced stimulation current can be produced with a net current to ground of less than 20 nA, thus virtually separated from ground. The circuit permits recording of the volitional myoelectric signal from the stimulated muscle. It is part of a portable myoelectrically controlled FES system powered by 2 AA batteries and currently used in clinical trials.
KW - Battery powered
KW - Biphasic stimulation
KW - Functional Electrical Stimulation
KW - Myoelectric signals
KW - Portable
KW - Stimulation artifacts
KW - Stimulation circuit
UR - http://www.scopus.com/inward/record.url?scp=70349446580&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349446580&partnerID=8YFLogxK
U2 - 10.1016/j.medengphy.2009.06.006
DO - 10.1016/j.medengphy.2009.06.006
M3 - Article
C2 - 19620017
AN - SCOPUS:70349446580
VL - 31
SP - 1032
EP - 1037
JO - Medical Engineering and Physics
JF - Medical Engineering and Physics
SN - 1350-4533
IS - 8
ER -