Safety System Design Simulation for Transcutaneous Electrical Nerve Stimulator using Electrode Contact Test

Safety System Design Simulation for Transcutaneous Electrical Nerve Stimulator using Electrode Contact Test

Mervin T. Hutabarat (Institut Teknologi Bandung, Indonesia) and Subaryani D. H. Soedirdjo (Institut Teknologi Bandung, Indonesia)
Copyright: © 2010 |Pages: 11
DOI: 10.4018/jehmc.2010070108

Abstract

TENS (Transcutaneous Electrical Nerve Stimulator) is a therapeutic device used to deliver electric current through one’s skin. As the device is used on the human body, safety concern becomes a matter that needs special attention. One option for electrical safety is testing whether the electrode has attached properly to the skin. The test is done in the interval of the simulator pulse. This option is used to protect users from electrical shock that can be caused from this device. Using 74HC4066 as the analog switch, this design can support the TENS specification.
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The Circuit

This instrument can be divided to three main units (Soedirdjo & Hutabarat, 2009). There are signal generator unit, voltage to current converter unit, and protection unit (Figure 1). The specifications are provided in Table 1.

Figure 1.

Systems block diagram (Soedirdjo, 2009)

jehmc.2010070108.f01
Table 1.
Specification of the system
Pulse Shapemonophasic, symmetric biphasic, asymmetric biphasic, spike-like biphasic
Output patterncontinuous, burst, amplitude modulation
Amplitude-50mA to 50mA
Frequency10 – 250 Hz
Active pulse duration10 -1000µs
Maximum load500Ω

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