Butterfly Back Electrodes | Silver-Grid Current Dispersion | TOP-RANK
Large-format TENS electrodes for lumbar and paraspinal stimulation. Features silver-grid reinforcement for < 15% current deviation. ISO 13485 and FDA compliant.
Product Overview
Butterfly electrodes are large-format (typically 105mm x 150mm) self-adhesive interfaces engineered for lumbar and paraspinal muscle recruitment. The device utilizes a reinforced conductive substrate to manage electrical flux over a surface area exceeding 100 cm². These are supplied to B2B rehabilitation centers requiring stable impedance during high-intensity chronic pain protocols.
Key Features
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Silver-Grid Current Density Balancing
Standard large-area pads often cause "stinging" at the center due to current crowding. Our silver-grid architecture functions as an electrical busbar, forcing current dispersion to the perimeter of the 150mm wing-span. This keeps the current density deviation below 15% across the entire active area, complying with IEC 60601-2-10 safety limits for skin temperature rise.
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High-Tack Hydrogel for Lumbar Flexion
The lower back is subject to significant mechanical strain and skin stretching during treatment. We employ a high-tack ionic hydrogel calibrated for a peel force of 5.0N - 7.0N. The cross-linking density of the polymer matrix is optimized to prevent "gel rolling" or delamination from the carbon substrate when the patient moves from a seated to a standing position.
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Edge-Tapered Resistance Gradient
To eliminate the "edge effect" where current spikes at the electrode boundary, the conductive coating features a tapered resistance profile. By increasing impedance towards the adhesive perimeter, the flux is directed inward, ensuring a soft pulse sensation even at high intensity (80mA+) settings.
Applications
Chronic Lower Back Pain (LBP)
Management of lumbar muscle spasms and radiculopathy.
Post-Surgical Rehabilitation
Muscle recruitment post-discectomy or spinal fusion.
Sciatica Management
Large-area stimulation covering the origin of the sciatic nerve path.
OEM & Private Label
- Supply Chain Logic: Primary SMT and component fabrication in China; final ultrasonic assembly and cleanroom kitting in our Vietnam hub to manage global tariff structures.
- Packaging Specs: High-barrier PET/AL/PE foil pouches with 8mm heat seals to maintain hydrogel hydration levels.
- Customization: Private label printing on the non-woven cloth or the PET release liners.
Certifications
Regulatory: FDA 510(k), CE (MDR 2017/745), UKCA.
Quality Systems: ISO 13485:2016 and MDSAP (USA, Canada, Australia, Japan, Brazil).
QC Testing: 100% current distribution mapping per batch; Accelerated Aging per ASTM F1980.
FAQ
Q: Why does the center feel hot while the wings feel weak?
A: This indicates a lack of silver-grid reinforcement. Electrons follow the path of least resistance at the entry point. Our grid logic bypasses this by creating a low-Ohm busbar across the entire 150mm span.
Q: Can these pads be reused more than 20 times?
A: Reuse depends on skin prep (pH and oils). The ionic hydrogel is tested for 15-20 cycles before the impedance typically exceeds 80 Ohms, at which point the stimulator requires higher voltage, increasing the risk of irritation.
CTA
B2B procurement teams can request technical drawings and multi-point impedance validation reports.
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Specifications
| Parameter | Metric / Value | Engineering Detail |
| Active Surface | 100 - 150 cm² | Single-piece paraspinal coverage |
| Impedance | < 30 Ohms | Silver-grid reinforced substrate |
| Interface | 2.0mm Pin / 3.5mm Snap | Precision-machined brass/stainless steel |
| Peel Force | 5.0N - 7.0N / 25mm | ASTM D3330 (High-tack matrix) |
| Shelf Life | 24 Months | High-barrier foil pouching |
