TrainFES Advance

The TrainFES Advanced is a battery-powered, wireless neuromuscular electrical stimulator with 6 channels designed for clinical and home use. It functions as both a powered muscle stimulator (for muscle spasm relaxation, atrophy prevention, blood circulation, post-surgical stimulation, and range of motion maintenance) and an external functional electrical stimulator (FES) to help relearn voluntary motor functions. It is controlled via a smartphone app and intended for adults aged 22 and older under medical supervision.

Compared to predicate device Stella BIO (K210002), TrainFES Advanced has 6 channels versus 8; uses alternating rather than synchronous EMG sampling; outputs only rectangular waveforms versus multiple shapes (rectangular, triangular, trapezoidal, sinusoidal); has a 3.7V Li-Ion battery instead of 7.4V; weighs 218g versus 112g; and has different maximum output voltages and current densities. Both are regulated-current, biphasic, symmetrical devices with identical pulse width, frequency, and phase charge specifications.

IEC 60601-1 (general electrical safety), IEC 60601-1-2 (electromagnetic compatibility), IEC 60601-2-10 (nerve and muscle stimulators), IEC 60601-1-11 (home healthcare environment), IEC 62133-2 (battery safety), IEC 62304 (software lifecycle), IEC 62366 (human factors), and ISO 14971 (risk management). Compliance with 21 CFR 898 confirmed.

Although the devices differ in channel count, sampling mode, waveform shapes, battery specification, weight, and dimensions, all differences either represent subset functionality (TrainFES has fewer channels and waveforms than Stella BIO) or are non-material variations that comply with the same core safety standards (IEC 60601-1 and IEC 60601-2-10). The indications for use are substantially identical for powered muscle stimulation and FES modes; the predicate device simply offers additional functions not claimed by the subject device. All electrical and safety parameters critical to patient protection (pulse width, frequency, net charge, maximum phase charge, regulated current control) are identical or equivalent, and bench testing demonstrates compliance with the same technical standards.