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Safety Notes
7
Isolated Stimulator Safety
Instructions
The Isolated Stimulator outputs of a front-end signal conditioner or PowerLab
with a built-in isolated stimulator are electrically isolated. However, they can
produce pulses of up to 100 V at up to 20 mA. Injury can still occur from
careless use of these devices. Several points must be observed for safe
operation of the Isolated Stimulator:
• The Isolated Stimulator output must only be used with the supplied bar
stimulus electrode.
• The Isolated Stimulator output must not be used with individual
(physically separate) stimulating electrodes.
• Stimulation must not be applied across the chest or head.
• Do not hold one electrode in each hand.
• Always use a suitable electrode cream or gel and proper skin preparation
to ensure a low-impedance electrode contact. Using electrodes without
electrode cream can result in burns to the skin or discomfort for the
subject.
• Subjects with implantable or external cardiac pacemakers, a cardiac
condition, or a history of epileptic episodes must not be subject to
electrical stimulation.
• Always commence stimulation at the lowest current setting and slowly
increase the current.
• Stop stimulation if the subject experiences pain or discomfort.
• Do not use faulty cables, or those that have exhibited intermittent faults.
• Do not attempt to measure or record the Isolated Stimulator waveform
while connected to a subject using a PowerLab input or any other piece of
equipment that does not carry the appropriate safety symbol (see Safety
Symbols above).
Always check the status indicator on the front panel. It will always flash green
each time the stimulator delivers a current pulse. A yellow flash indicates an
‘out-of-compliance’ (OOC) condition that may be due to the electrode contact
drying up. Always ensure that there is good electrode contact at all times.
Electrodes that are left on a subject for some time need to be checked for dry
contacts. An electrode impedance meter can be used for this task.
• Always be alert for any adverse physiological effects in the subject. At the
first sign of a problem, stimulation must be stopped, either from the
software or by flicking down the safety switch on the front panel of any
built-in Isolated Stimulator or the ML180 Stimulus Isolator.