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g.tec medical engineering · Stimulation and triggering

g.ESTIM PRO

Cortical stimulator

g.ESTIM PRO is a constant-current, biphasic electrical stimulator designed to stimulate neural tissue during functional brain mapping procedures before cortical resections. It includes impedance checking and measures the current and voltage actually applied, for verification; its 80 V compliance voltage suits both standard and high-impedance electrodes.

  • CE-marked
  • FDA cleared
  • ±0.2 – 15 mA
  • 80 V compliance voltage
Used in
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g.ESTIM PRO cortical stimulator

Highlights

  • Biphasic constant-current pulses
  • An API for configuring stimulation parameters on the fly
  • A standalone device controlled in real time from a computer
  • Sends trigger signals to other devices for synchronisation
  • Electrode impedance checking and stimulation current monitoring
  • Real-time EEG/ECoG analysis in closed-loop experiments with g.USBamp or g.HIamp and g.HIsys
  • A CE-marked, FDA-cleared medical device for use in patients; by trained staff only, in a medical setting

Technical specifications

Stimulation current output
±0.2 – 15 mA (±10%)
Phase shape
Rectangular
Phase duration
0.1 – 1.0 ms (10 µs steps)
Pulse rate
2 – 100 pulses/s (0.1 steps)
Pulse train duration
1 pulse – 20 seconds
Power supply
2 × 9 V batteries, USB connection
Compliance voltage
80 V
Certification
IEC 60601-1, IEC 60601-2-40, FDA
Switching unit

Choosing the stimulation electrodes from 64, 128 or 256 channels

The Switching Unit selects the electrodes that deliver the electrical stimulation and connects to g.HIamp for EEG or ECoG measurement. It disconnects g.HIamp during stimulation, can connect to clinical recording systems for 24-hour monitoring, and is controlled in real time with g.HIsys. Channel switching completes in 6 ms, and a software command's round trip takes under 30 ms.

  • 64 / 128 / 256 channels
  • 256 relays
  • g.HIamp
  • g.HIsys
Advanced impedance measurement

A wide frequency and magnitude range

The Switching Unit measures electrode impedance with high precision over a frequency range of 20–1000 Hz and a magnitude range of 1–800 kΩ. With the Impedance Measurement Tool, settings are easy to configure, results quick to review, and reports ready for publication.

  • 20–1000 Hz
  • 1–800 kΩ
  • Publication-ready reports
Stimulation log viewer

The whole session in StimLogViewer

StimLogViewer gives a comprehensive overview of the key events and parameters of your brain stimulation sessions: stimulation sites, current amplitudes and timings, system states; in real time during the experiment or by going back to past sessions.

  • Real-time monitoring
  • Past sessions
  • Current amplitude & timing
Simulink interface

Intracranial stimulation at 80 V

An 80 V compliance voltage makes it possible to stimulate the cortex electrically through ECoG grids, strip electrodes or depth electrodes: stimulating the somatosensory cortex to add a sense of touch to BCI-controlled robotic devices, or deep brain stimulation experiments in Parkinson's patients. Parameters such as onset time and current are set and triggered in real time from Simulink.

  • MATLAB / Simulink
  • Somatosensory cortex
  • DBS
Clinical research

Face and colour processing in the brain

In a patient undergoing surgery for epilepsy, electrical stimulation of ventral temporal regions was used to study the specificity of colour- and face-processing areas. Stimulating colour-selective sites affected colour perception and stimulating face-selective sites affected face perception, independently; the patient reported illusory faces and illusory rainbows.

  • Ventral temporal cortex
  • PNAS paper

Up close

g.ESTIM PRO with hand switch, foot switch and cables

Applications

g.tec
Contact

Let's plan your project together.

Talk to our team about device selection, protocol design, installation and software integration. We will work out the technical configuration that best fits your research or clinical goal.

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