DS7A & DS7AH High Voltage Constant Current Stimulators

FEATURES

• Medical device MDD CE-certified and FDA-approved
• 50 µs to 2 ms (DS7A) and 50 µs to 200 µs (DS7AH) pulse durations
• Constant current output of 100mA (DS7A) or 1A (DS7AH) from 400V
• Various trigger alternatives that are TTL compatible or a front panel push button
• Control of alternating polarity - a toggle switch enables the stimulator to function during stimulation in either the positive or negative (or both) polarities.

The DS7A and DS7AH HV Current Stimulators have FDA clearance in the USA and are CE-marked for medical use in the UK and EU. They can be used as general-purpose electrical nerve or muscle stimulators for humans. The DS7A offers trans-cutaneous stimulation for up to 100mA constant current, high voltage, brief pulses during examination of the electrical activity of nerve and muscle tissue. The DS7A is also frequently employed in applications related to psychology, cognitive neuroscience, and pain research. The output current is constantly variable from a maximum compliance voltage of 400 V over the range of 0 to 100 mA. The DS7AH allows currents up to 1 A with a lowered maximum pulse duration limit of 200 µs for applications that require more rigorous performance. This concept is provided to get around the challenges of using big area electrodes to stimulate deep peripheral nerves or huge muscles like the quadriceps. We now offer the DS7R and DS8R research stimulators for individuals who need the high currents of the DS7AH as well as the freedom to employ pulses of up to 2ms.

Current versions of the DS7A and DS7AH contain a three position (+ve, alternating, and -ve) polarity control, enabling the user to change stimulus polarity or continuously alternate polarity between succeeding stimuli. This is done to reduce tissue polarization and in response to demands from customers. The instrument is mains powered and housed in a non-conductive, free-standing housing. The stimulator triggers on the positive edge and requires a TTL trigger pulse input (negative edge can be factory set). Another option is to press the push button on the front panel or connect a foot switch to a socket on the back panel. On the back panel, a BNC socket offers a TTL compatible trigger output.

The D185 MultiPulse Transcranial Cortical Stimulator is advised for greater voltages.

While our DS8R Biphasic Research Stimulator offers the same output capabilities as the DS7AH, it also includes true biphasic output and a variety of choices for external control of all pulse characteristics, unlike the DS7A and DS7AH, which do not allow any external control of the stimulus parameters.