ESTIM FES

PROGRAMMABLE FES FOR NEUROREHABILITATION

The g.Estim FES delivers programmable biphasic constant-current stimulation for neurological and orthopedic rehabilitation. Stimulation parameters can be adapted to individual therapeutic requirements, allowing controlled activation of muscles and nerves during rehabilitation.

The system supports therapeutic applications including muscle re-education, temporary reduction of muscle spasms, prevention or retardation of disuse atrophy, increasing local blood flow, and maintaining or increasing range of motion.

With stimulation currents from 1 to 60 mA, configurable pulse parameters, work and rest periods, and adjustable rising and falling ramps, g.Estim FES provides flexible control over repeated muscle stimulation and rehabilitation protocols.

EXPLORE FES APPLICATIONS

CONTROL EVERY PHASE OF THE STIMULATION

g.Estim FES provides precise control over the parameters that shape each stimulation cycle. Researchers and clinicians can configure the stimulation current, phase duration, pulse rate, work and rest periods, and rising and falling ramps to adapt stimulation to the application and desired muscle response.

Stimulation current can be programmed from 1 to 60 mA, with phase durations from 50 to 400 µs and pulse rates from 1 to 100 pulses per second. Work and rest periods define repeated stimulation cycles, while adjustable ramps allow the stimulation intensity to increase and decrease gradually.

PROGRAM & CONTROL FES WITH MATLAB/SIMULINK

Go beyond predefined stimulation protocols and integrate g.Estim FES directly into programmable research workflows. In combination with g.HIsys, stimulation parameters can be configured and controlled from MATLAB/Simulink, allowing researchers to adapt FES to their experimental paradigm.

During stimulation, the system provides feedback on the stimulation state and delivered current, helping researchers verify whether the programmed stimulation can be applied under the current electrode conditions.

This makes g.Estim FES suitable for custom stimulation paradigms, automated experiments and real-time research applications where stimulation needs to interact with other components of the experimental setup.

EXPLORE g.HISYS

COMBINE EEG WITH FUNCTIONAL ELECTRICAL STIMULATION

Combine g.Estim FES with g.tec EEG or ECoG acquisition systems to integrate functional electrical stimulation into brain-signal-based experiments. Systems such as g.HIamp, g.USBamp and g.Nautilus can acquire neural activity while g.HIsys provides the environment for real-time signal processing and experimental control.

Brain signals can be analyzed in real time and used within programmable research workflows to control stimulation, enabling applications in BCI research, motor rehabilitation and closed-loop neuroscience.

This creates a complete research workflow in which neural activity can be recorded, processed and translated into functional electrical stimulation.

SYNCHRONIZE FES WITH YOUR EXPERIMENT

g.Estim FES provides two digital outputs (DO1 and DO2) for synchronizing external equipment with electrical stimulation. The synchronization signals can be recorded together with EEG, ECoG or other biosignals, allowing researchers to align the stimulation timing with the acquired physiological data.

This enables stimulation events to be integrated into multimodal experiments, real-time analysis workflows and synchronized neurophysiological recordings. The digital outputs can indicate stimulation timing so that researchers can identify when stimulation occurred in relation to the recorded signals.

SPINAL CORD INJURY

For people with spinal cord injury, FES can be used to activate partially or fully paralyzed muscles and generate functional movement. g.Estim FES can be integrated into a BCI workflow in which motor imagery is detected from brain activity and translated into electrical stimulation to produce movements such as hand opening and grasping.

The potential of this approach was demonstrated by Gaurav Sharma and the team at Battelle Memorial Institute, whose implanted BCI enabled real-time cortical control of wrist and finger movements and received the BCI Award 2016.

BCI & FES FOR UPPER-LIMB STROKE REHABILITATION

Sebastián-Romagosa et al. – Frontiers in Neuroscience, 2020

In a study with 51 stroke patients with upper-extremity hemiparesis, motor imagery was detected with a BCI and paired with g.Estim FES stimulation of the wrist extensors. After 25 sessions, the study reported significant improvements in upper-extremity motor function and reductions in wrist and finger spasticity, with improvements persisting at the six-month follow-up.

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BCI-TRIGGERED FES FOR GAIT REHABILITATION AFTER STROKE

Sebastián-Romagosa et al. – Frontiers in Neuroscience, 2023

Researchers investigated motor-imagery BCI training in 25 stroke patients with gait disability. g.Estim FES was used to stimulate wrist and ankle extensors when the BCI detected the corresponding motor imagery, combining brain-signal detection with functional electrical stimulation as part of the rehabilitation workflow.

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BCI & FES FOR GAIT REHABILITATION IN MULTIPLE SCLEROSIS

Sebastián-Romagosa et al. – Frontiers in Medicine, 2026

Researchers evaluated a motor-imagery BCI combining g.Nautilus PRO, two g.Estim FES stimulators and virtual-reality feedback in people with Multiple Sclerosis. Twenty-four participants completed 30 BCI sessions, with the study reporting improvements in walking endurance, mobility, spasticity and patient-reported outcomes that were largely maintained six months after treatment.

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