Description
DESCRIPTION
DS7A & DS7AH HV Current Stimulators are suitable as general purpose electrical nerve or muscle stimulators for human stimulation and are medically CE marked in the UK/EU and 510(k) FDA cleared within the USA. The DS7A provides up to 100mA constant current high voltage pulses of brief duration for trans-cutaneous stimulation during investigation of the electrical activity of nerve and muscle tissue. The DS7A is also commonly used in psychology, cognitive neuroscience and pain research applications. The output current is continuously variable over the range 0 to 100mA from a maximum compliance voltage of 400V. For more demanding applications, the DS7AH allows currents up to 1A with a reduced maximum pulse duration limit of 200µs. This model is offered to overcome the difficulties of stimulating deep peripheral nerves, or large muscles such as the quadriceps with large area electrodes. For those who require the high currents of the DS7AH along with the flexibility to use pulses of up to 2ms, we now offer the new DS7R and DS8R research stimulators.
To reduce tissue polarization and in response to customer demand, current models of the DS7A and DS7AH include a three position (+ve, alternating and -ve) polarity control, allowing the user to reverse stimulus polarity or automatically alternate polarity between successive stimuli. The instrument is mounted in a non-conductive, free standing case and is mains powered. The stimulator requires a TTL trigger pulse input and triggers on the positive edge (negative edge can be factory set). Alternatively a foot switch may be connected to a socket on the rear panel or the front panel push button pressed. A TTL compatible trigger output is provided at a BNC socket on the rear panel.
For higher voltages we recommend the D185 MultiPulse Transcranial Cortical Stimulator.
While the DS7A and DS7AH do not permit any external control of the stimulus parameters, anyone interested in this sort of capability should refer to our DS8R Biphasic Research Stimulator, which offers the same output capabilities as the DS7AH, but adds truly biphasic output and multiple options for external control of all pulse parameters.
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DS7A & DS7AH Application Note
Using a pair of DS7 stimulators in parallel
DS7A & DS7AH HV Current Stimulator
Product Information
References
Publications which cite use of the Digitimer DS7A & DS7AH can be found on Google Scholar.
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ACCESSORIES
Supplied
- Mains (Power) lead
- Operator’s Manual
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