EMS Muscle Stimulator | Bi-phasic Square Wave | TOP-RANK
Dual-channel NMES device for motor unit recruitment. Adjustable pulse width 50-450µs. Features symmetrical bi-phasic waveforms to eliminate net DC charge and skin irritation.
Product Overview
This hardware is a constant-current pulse generator designed for Neuromuscular Electrical Stimulation (NMES). The device output is firmware-mapped into three distinct functional modes: EMS for motor nerve depolarization, TENS for sensory gate modulation, and MASS for mechanical percussive simulation. It is a B2B supply-chain solution for clinical physical therapy and sports recovery sectors.
Key Features
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Motor Nerve Depolarization (450µs Threshold)
Effective muscle recruitment requires exceeding the chronaxy of motor nerves. The hardware supports pulse widths up to 450µs. This allows for recruitment of Type II fibers at lower intensity levels compared to devices limited to 250µs, reducing the sensory discomfort often associated with high-voltage stimulators.
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Galvanic Isolation between Channels
Each output channel is driven by an independent isolation transformer. This topology prevents current leakage between channels, allowing different muscle groups to be stimulated at vastly different intensities without signal interference or total current drop across the common ground.
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Constant Current Output Drive
The device utilizes a feedback loop to monitor electrode-skin impedance in real-time. As skin impedance fluctuates (due to sweat or pad aging), the circuit adjusts the voltage rail to maintain a constant current (mA) output. This prevents "current spikes" that cause stinging.
Applications
Atrophy Prevention
Post-surgical muscle maintenance (e.g., ACL reconstruction).
Neurological Rehab
Gait training and functional electrical stimulation (FES).
Athletic Conditioning
Explosive power recruitment and eccentric load simulation.
OEM & Private Label
Dual-site production (China and Vietnam) for supply chain redundancy.
- Firmware: Custom program logic (Ramp-up/Contraction/Rest/Ramp-down cycles).
- Hardware: Custom housing color and silkscreen branding.
- Kitting: Available with custom lead wire lengths and private-label electrode pads.
Certifications
Regulatory: FDA 510(k), CE (MDR), UKCA.
Safety Testing: IEC 60601-1 (General Safety) and IEC 60601-2-10 (Nerve and Muscle Stimulators).
Batch QC: Every unit undergoes output current verification at 500, 1000, and 2000 Ohm loads.
FAQ
Q: Why is the pulse width adjustable up to 450µs?
A: Lower pulse widths (under 150µs) primarily stimulate sensory nerves (TENS). EMS requires 200µs to 450µs to bypass sensory thresholds and directly trigger motor nerve depolarization for effective muscle contraction.
Q: Does the 3-in-1 functionality compromise EMS power?
A: No. The firmware manages the mode logic, but the hardware's step-up transformer is sized for the maximum current draw required by high-intensity EMS protocols, regardless of whether TENS or MASS modes are selected.
CTA
B2B procurement teams can request technical PCB schematics and battery safety reports for evaluation.
👉 [Request Evaluation Unit for Clinical Review]
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Specifications
| Component | Technical Specification | Engineering Detail |
| Output Channels | Dual Independent Channels | Isolated circuit design |
| Waveform | Symmetrical Bi-phasic Square | Zero net DC charge |
| Pulse Width | 50µs - 450µs (Adjustable) | Targeted motor nerve stimulation |
| Pulse Rate | 1Hz - 150Hz | Tetanic contraction capability |
| Output Intensity | 0 - 100mA (1000 Ohm load) | High-impedance skin penetration |
| Power Source | Lithium Rechargeable / 9V DC | High-cycle battery life |
