Research and Clinical Instruments Manufacturer & Supplier
Acquisition InterfacesNational Instruments USB-6341-BNCHEKA LIH 8+8 Data Acquisition SystemAmplifiersNeuroLog SystemD360 8-Ch. EP/EEG/EMGD360R 4 Channel Isolated Research Amplifier/FilterD440 2/4 Ch. EMG/EPHEKA EPC10 Patch ClampHEKA EPC10 2/3/4 Ch. Patch ClampHEKA EPC800 Patch ClampAnti-vibration SystemsThorLabs Science DesksNarishige ITS Anti-vibrationNarishige Double MagnetNarishige SBP-2 BaseplateCell InjectorsPLI-100A Pico-injectorPLI-10 Pico-injectorNarishige IM-11-2Narishige IMS-20Narishige IM-21Narishige IM-400Injection Accessories
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Signal GeneratorsTG315 Function GeneratorSoftwareQtracW Threshold TrackingQTMS QtracW TMS ExtensionAutoMate EasycodeHEKA Chartmaster SoftwareHEKA Patchmaster SoftwareHEKA Fitmaster SoftwareStimulatorsDS2A Constant VoltageDS3 Constant CurrentDS4 Biphasic Constant CurrentDS5 Bipolar Constant CurrentDS7A/DS7AH Constant CurrentDS7R Constant Current ResearchDS8R Biphasic ResearchD121-11 Mounting FrameD185 Transcranial MultiPulseD330 MultiStim SystemNL800A Current Stimulus Isolator
A/D Interface ModulesNL201 – Spike TriggerNL601 – Pulse IntegratorAmplifier ModulesNL100AK – HeadstageNL100RK (NL100AKS & NL100C)NL102G – DC PreamplifierNL104A – AC PreamplifierNL106 – AC/DC AmplifierNL108A – Pressure AmplifierNL109 – Bridge AmplifierNL120S – Audio AmplifierNL820A – 4-Ch. IsolatorNL844 – 4-Ch. AC PreamplifierAnalogue ModulesNL254 – RatemeterNL506 – Analogue SwitchNL703 – EMG Integrator
Digital ModulesNL405 – Width/DelayNL501 – Logic GateNL505 – Flip FlopNL603 – CounterNL730 – Pulse ShiftFilter & Conditioner ModulesNL125/6 – Band-Pass FilterNL134/5/6 – 4-Ch. Low Pass FiltersNL143 – 3-Ch. Difference AmplifierNL144 – 4-Ch. High Pass FilterNL530 – Signal ConditionerNL540 – Inverting Attenuator (Alt. Gain)Generator ModulesNL301 – Pulse GeneratorNL304 – Period GeneratorNL412 – Pulse
NeuroLog AccessoriesAccessory KitsAdaptors & Adaptor CablesSockets (for cable mounting)Sockets (for panel mounting)Plugs (for cable mounting)Extension CablesCablesElectrode HoldersMiscellaneous AccessoriesNeuroLog System CasesNL900D – NeuroLog System CaseNL905 – Compact NeuroLog System Case
Pressure Transducers & AccelerometersPressure TransducersForce TransducersAccelerometersStimulator ModulesNL510 – Pulse BufferNL512 – Biphasic BufferNL800A Constant Current Stimulus Isolator
Application NotesSignal AmplificationTriggering & Pulse GenerationSignal Conditioning Filtering & ProcessingElectrical Stimulation
Isolated Amplifiers for EMG/EEG/EP D440 2/4-Ch. EMG AmplifierD360 8-Ch. Patient Amplifier D360R 4-Ch. Research AmplifierAmplifier Accessories D175 Electrode Impedance Meter D179 Performance Checker D360 Audio Interface D360 USB to Serial Adaptor D177 Bio-Feedback Unit
Peripheral Stimulators DS5 Isolated Bipolar Constant Current Stimulator DS7A & DS7AH HV Constant Current Stimulator DS7R HV Constant Current Research Stimulator DS8R Biphasic Constant Current Stimulator
Transcranial Cortical StimulatorsD185 MultiPulse Cortical Electrical StimulatorStimulator AccessoriesD188 Remote Electrode SelectorElectrode Connection HeadboxesTrigger CablesElectrode HandlesMiscellaneous Items
Neurodiagnostic AccessoriesIntraoperative Neuromonitoring (IONM) Electroecephalography (EEG) Electromyography (EMG)Nerve Conduction Study (NCS) Evoked Potential (EP)Axelgaard Stimulation ElectrodesTouch Proof Plugs Adaptors & Electrode Linkers
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£3,462.00 exc. VAT
Manufacturer's Net List Price
Suitable as a general purpose electrical nerve or muscle stimulator for peripheral stimulation in human research studies, the DS7R provides up to 999mA constant current high voltage pulses of brief duration for trans-cutaneous stimulation during investigation of the electrical activity of nerve and muscle tissue. The DS7R is specifically recommended for human research applications where its high voltage, high current and flexible pulse duration capabilities permit stimulation of large muscle groups or deep nerves/nerve roots.
High Current & Flexible Pulse Duration Options
The DS7R Constant Current Research Stimulator is based on and almost identical to the medically approved DS7AH. The output current is continuously variable over two ranges of 0 to 99.9mA and 0 to 999mA, but where it differs is in relation to the available pulse durations. With the DS7AH, the maximum permitted pulse duration is 200µs, while the DS7R allows pulses of up to 2ms*. Because this greater flexibility is only required in human research applications, the DS7R is NOT medically approved and is marketed for human or animal research use only.
Safe for Human Research Use
In relaxing the pulse duration limits, the maximum pulse energy the DS7R can deliver has increased slightly. While this takes it beyond the 50mJ limit imposed by the international standard applicable to evoked potential stimulators (EN60601-2-40), it is well within the 300mJ limit applicable to electrical stimulators in human therapeutic use (EN60601-2-10).
Like the DS7A and DS7AH, the DS7R includes an alternating polarity mode to prevent polarization of the stimulation site and potentially harmful electrolytic effects of longer periods of stimulation.
The DS7R can be triggered by an external device such as our new DG2A Train/Delay Generator. For human research applications requiring greater flexibility in terms of stimulus parameters and/or external control, please consider our new DS8R Biphasic High Voltage Constant Current Stimulator. For applications that require a medically certified stimulator, please refer to our DS7A/AH High Voltage Constant Current Stimulators, the DS5 Bipolar Stimulator or our D185 MultiPulse Transcranial Cortical Stimulator.
* The actual achievable current is subject to the set current amplitude, frequency of stimulation and load impedance/available compliance voltage.
DS7R Constant Current Research Stimulator
As the DS7R is a new product there are only three publications at this time, but this list will be extended as more work is published.
Brownstein, C. G., Espeit, L., Royer, N., & … (2021). Reductions in motoneuron excitability during sustained isometric contractions are dependent on stimulus and contraction intensity. Journal of Neurophysiology. Retrieved from https://doi.org/10.1152/jn.00070.2021
Varesco, G., Royer, N., Singh, B., Parent, A., Féasson, L., Lapole, T., … Rozand, V. (2021). Reliability and agreement of a dynamic quadriceps incremental test for the assessment of neuromuscular function. Journal of Electromyography and Kinesiology, 56. https://doi.org/10.1016/j.jelekin.2020.102503
Neige, C., Grosprêtre, S., Martin, A., & Lebon, F. (2020). Influence of voluntary contraction level, test stimulus intensity and normalization procedures on the evaluation of short-interval intracortical inhibition. Brain Sciences, 10(7), 1–16. https://doi.org/10.3390/brainsci10070433
Last updated 6th April 2021
The DS7R has the same maximum current output as the DS7AH, but the more flexible pulse duration settings of the DS7A (50µs to 2ms), making it more versatile than the DS7AH. However, because the maximum energy that the stimulator can deliver is in excess of 50mJ, which exceeds the EN60601-2-40 standard for evoked potential stimulators, we are not able to give the DS7R a medical CE mark against that standard. Instead, the DS7R is offered for human research applications, where more flexible pulse parameter settings may be required.
No, in order for the DS7AH to be granted medical device status, it is necessary for us to restrict the pulse energy to a maximum of 50mJ. If you require stimulation pulses in excess of 100mA with durations of >200µs, the DS7R is the only device we can offer, but while safe for human research use, it is not a medical device.
No, the DS7R does not have this capability, but our new DS8R stimulator does offer external control via Windows PC software, an embedded API or an analogue voltage input (to define pulse amplitude).
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