DS7A & DS7AH High Voltage Constant Current Stimulators

DS7A & DS7AH High Voltage Constant Current Stimulators

£3,701.00 – £3,846.00 exc. VAT

Manufacturer's Net List Price

FEATURES

  • MDD CE certified and FDA cleared medical device
  • Pulse durations from 50µs to 2ms (DS7A) and 50µs to 200µs (DS7AH)
  • 100mA (DS7A) or 1A (DS7AH) constant current output from 400V
  • Flexible TTL compatible trigger options or front panel push button
  • Alternating Polarity control – a toggle switch allows the stimulator to operate in +ve, -ve or alternating polarities during stimulation
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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.

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DOWNLOADS

Product Information

DS7A & DS7AH Application Note
Using a pair of DS7 stimulators in parallel

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DS7A & DS7AH HV Current Stimulator
Product Information

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DOWNLOAD BROCHURE

Digitimer-Life-Science-Brochure-1

PUBLICATIONS

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ACCESSORIES

Supplied

  • Mains (Power) lead
  • Operator’s Manual

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FAQs

▼ I am trying to get my DS7A to produce a train of pulses but I cannot figure out what sort of input signal it needs to do this, can you help?
So I think the problem you are having relates to the type of control signal you are giving the DS7A. The DS7A does not have any built in repetitive trigger facility i.e you cannot for instance set it to 50Hz and then GATE it to be on for the duration of a TTL high command. Instead you have to supply one trigger pulse for each stimulus pulse, so if you want to deliver a train of ten stimuli at 50Hz, you will have to send 10 TTL compatible pulses at that required frequency. The DS7A is triggered by the rising/+ve (or with internal jumper modification the falling/–ve) going edge of a 3V to 5V TTL compatible rectangular pulse and this pulse must be at least 5µs in duration. So, in order to program repetitive stimulation you will need to deliver a series of such pulses via the trigger input. Should you not have this capability, we do have a simple battery powered device that can be gated on and off with a TTL high/low command. We can provide more details on this DG2A Train/Delay Generator, should you require it.
▼ I have one of your DS7A stimulators, but the pulse duration control knob doesn’t turn to the 0.5-2ms settings, should I return it for repair?
The higher output DS7AH has a limiting feature that for safety reasons prevents use of these wider pulse durations. Although your stimulator has DS7A on the front panel, please check the serial number label on the back of the unit, as I think you will find it indicates that it is a DS7AH.
▼ Is it possible to use two DS7A stimulators in parallel to stimulate a subject with a pair of different pulse types through the same set of electrodes?
Yes, it is possible to do this and the method has been summarized in an application note.
▼ I am planning to trigger a DS7A using a computer DA interface. What are the requirements for the trigger pulse?
The DS7A/AH triggers on the +ve edge of a standard TTL compatible logic pulse (+3V to +15V) of at least 5µs duration.
▼ What sort of output plugs do I need in order to connect electrodes to the DS7A stimulator?
The DS7A and DS7AH are not supplied with output plugs, however we do provide them as optional accessories. The part code for a pair (one red, one black) is D185-OC1.
▼ Are any of your stimulators MRI compatible?
Our stimulators are not classed as MRI safe, as all of them contain ferrous materials which means they cannot be used within a magnetic field. However, as long as they are located beyond the reach of magnetic field or in the scanner control room they may be used. It is important that MRI compatible electrodes and cables are used within the scanner room.
▼ I want to use Axelgaard electrodes with my Digitimer stimulator when stimulating feet in some human research studies, but how should I interface the electrodes with the stimulator?
Axelgaard electrodes are pre-wired with a short pig-tail terminating in a 2mm socket. Digitimer typically uses 1.5mm DIN42802 connectors for our products, so in order to interface these electrodes with a DS7A, DS7AH, DS7R, DS5 or DS8R, you would need one of our D185-HB4 output cables (various lengths) as well as a pair of DS7A-M338 adaptors (30cm or 90cm) which convert from 1.5mm DIN42802 to a 2mm pin.
▼ I am trying to decide whether I need to use the DS7A or DS7AH, do you have any advice?
The maximum output of the DS7A is 100mA while that of the DS7AH is 1A (with reduced output widths). We find that for the majority of applications, the DS7A is perfectly suitable, however, the main exception is where the human quadriceps muscle is being directly stimulated. In this particular case, we would recommend the higher output of the DS7AH.
▼ I want to produce trains of electrical stimuli and the DS7A does not include a frequency generator, does Digitimer have a simple device which could be used for this purpose?
Of course we do. Digitimer manufactured several devices suitable for this. Certain configurations of the NeuroLog system can be used to generate quite complex trigger pulse protocols compatible with the trigger input of the DS7A/AH. However, our battery powered DG2A Train/Delay Generator complements the DS7A/AH by providing a continuous burst of trigger pulses with control over frequency.
▼ Does Digitimer supply a range of electrodes for use with their stimulators?
Digitimer does now offer a range of Neurodiagnostic accessories to be used with our stimulators and amplifiers. We appreciate that we cannot include all types of electrode, so If you experience difficulty obtaining electrodes of the correct specifications, we would be glad to help.

APPLICATIONS

EPS-P10 Placement

Using the DS7A to Study Pain & Secondary Hyperalgesia

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    DS7A (100mA) HV Current Stimulator, DS7AH (1A) HV Current Stimulator

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