Dry-printed electrodes for transcutaneous electrical stimulation of innervated muscles: Towards wearable and closed-loop stimulation.
Rawan Ibrahim, Ieva Vėbraitė, Daniele Re and 4 others
PMID 41152919WHAT IT FOUND
Dry printed electrodes delivered muscle stimulation in healthy necks with similar comfort and activation thresholds to conventional gel electrodes.
A one-person facial trial showed these electrodes can trigger real-time mirrored movement, though the half-second delay and lack of patient testing limit current clinical use.
Key findings
01In 12 healthy participants, dry electrodes achieved comparable muscle activation thresholds and pain ratings to gel electrodes during neck stimulation.
02A single-subject facial trial demonstrated that dry electrodes could detect voluntary muscle activity and trigger contralateral stimulation, but the system had a 500 ms latency.
03The study was conducted entirely on healthy individuals with innervated muscles, so the observed stimulation thresholds do not apply to patients with paralysis or denervated muscle.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
All participants were healthy adults with normal skin and innervated muscles, so results do not generalize to elderly patients, those with dermatological issues, or individuals with denervated muscles (e.g., stroke or Bell's palsy). The closed-loop facial experiment was performed on only one healthy subject, providing no evidence of efficacy for patients with facial asymmetry. Stimulation was tested only on the neck; thresholds and comfort may differ significantly in other body regions like the forearm or leg. The study used short-term sessions; long-term durability of dry electrodes under repeated clinical pulse counts remains unverified. The facial system had a 500 ms latency, which is too slow for real-time natural movement correction.
Declared interests
Funding was provided by the Deutsche Forschungsgemeinschaft, Berufsgenossenschaft Nahrungsmittel und Gastgewerbe, the European Research Council, and the Israel Science Foundation. The electrodes were purchased from X-trodes Ltd., a commercial entity.
The easy way to misread this
Do not assume dry electrodes are safe or effective for patients with denervated muscles or facial palsy. This study tested only healthy individuals with innervated muscles, and the authors explicitly state that the observed thresholds and closed-loop paradigm are not directly applicable to patients with neuromuscular impairments.
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