Researchers in South Korea have developed a wearable electroceutical platform designed to deliver electrical stimulation through microneedles and allow remote control via smartphone. The experimental technology could eventually support personalized, non-drug pain management outside hospitals, although its therapeutic effectiveness in people with chronic pain has yet to be established.
The system was developed by researchers from KAIST and the Korea Institute of Oriental Medicine (KIOM). The research combines a skin-attached microneedle electrode with wireless communication, remote management and automated stimulation based on physiological signals.
Alternative approach to pain management
Electrical stimulation is being investigated as an alternative or complement to medication for chronic pain. Long-term use of some painkillers can cause side effects, while prolonged opioid use can involve risks including tolerance and misuse. Existing electroceutical technologies have their own limitations. Implantable systems require surgery, while conventional electrodes attached to the skin can be affected by sweat, dead skin cells and other variations in skin condition. Concentrating electrical current in particular areas can also increase local temperature and potentially damage the skin.
To address these problems, the researchers developed conductive, adhesive microneedles that penetrate the highly resistant outer layer of the skin. This is intended to provide more stable electrical stimulation despite changing skin conditions. The electrode is coated with a conductive hydrogel designed to distribute electrical current more evenly and prevent it from concentrating around individual microneedle tips.
Protection against overheating
The researchers also incorporated a temperature-responsive safety mechanism. If skin temperature becomes abnormally high, adhesion between the electrode and skin decreases, causing the patch to detach automatically. The mechanism is intended to reduce the risk of burns associated with electrical stimulation. Beyond the electrode itself, the platform incorporates Internet of Things technology. Through a smartphone and cloud server, a healthcare provider can remotely adjust operating times and electrical stimulation, either in real time or according to a predefined schedule.
The team demonstrated remote operation over international distances, including between South Korea and the United States. If subsequently validated in patients, the approach could potentially allow people to receive supervised electrical stimulation at home without travelling to a healthcare facility for every treatment.
Automated stimulation
The researchers also explored whether the wearable could respond automatically to physiological changes. A photoplethysmography sensor, which uses light to measure changes in pulse and blood flow, was used to identify states associated with pain-related stress. These signals were incorporated into a closed-loop system capable of automatically triggering electrical stimulation. Such an approach could eventually allow treatment to adapt to a patient's physiological state rather than relying exclusively on manual activation. However, the current research does not establish that the system can autonomously recognize and effectively treat chronic pain in patients.
The platform was evaluated in animal experiments and a small study involving healthy adults. In animal testing, the microneedle system delivered current more effectively than conventional gel electrodes, and analgesic effects were observed. The human study had a more limited objective. Researchers measured changes in sensory pain thresholds after electrical stimulation in healthy participants to explore the technology's potential for human use. Direct pain-relieving effects were demonstrated only in the animal experiments.
Further clinical studies will therefore be necessary to determine whether the technology can safely and effectively manage pain in people with chronic conditions, particularly during long-term use. The researchers envisage that, following clinical validation, the combination of microneedle stimulation, remote supervision and physiological monitoring could form the basis of a personalized digital platform for non-pharmacological pain management.
Wound healing microneedle patch
Earlier this year, researchers developed an intelligent microneedle patch designed to actively support the healing of chronic wounds, including those associated with diabetes. The platform combines AI, 4D printing, biomimicry, DNA nanotechnology and antibacterial surface engineering. Inspired by the carnivorous plant Drosera capensis, the microneedles remain straight during application but curve at body temperature, helping draw wound edges together and maintain tissue contact.
Machine learning was used to optimize the materials and manufacturing conditions needed for this shape transformation. The patch also gradually releases regenerative molecules through adhesive DNA nanoparticles, while a zinc-treated surface provides antibacterial protection. Preclinical experiments showed faster wound closure and improved tissue regeneration compared with conventional wound-management approaches, alongside activity against E. coli and S. aureus.
References
Nature Communications (research)
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