Smartphone-controlled microneedle patch could offer drug-free pain care from afar
· Medical Xpressby The Korea Advanced Institute of Science and Technology (KAIST)
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A "wearable electroceutical" has been developed that could reduce the need to visit a hospital or rely on painkillers every time pain occurs. When attached to the skin, it modulates pain through electrical stimulation and can be remotely controlled via smartphone even across long distances, such as between Korea and the United States.
A joint research team led by Professor Jae-Woong Jeong from the School of Electrical Engineering at KAIST and Dr. Sanghun Lee from the KIOM (Korea Institute of Oriental Medicine) has developed a wearable electroceutical platform that combines a wireless microneedle (fine needles that adhere to the skin) electroceutical with Internet of Things (IoT)-based remote-control technology.
The research is published in Nature Communications. A key feature is that a single small skin-attached device integrates stable electrical stimulation, smartphone-based remote control and automatic stimulation based on the body's physiological state. Once its efficacy and safety are validated with actual patients, the technology may be used for personalized pain management at home or in daily life.
Limits of drugs and electrodes
The need for such an approach is particularly relevant for chronic pain management. Painkillers are widely used to treat chronic pain, but long-term medication use raises concerns about side effects and dependency.
In particular, opioid analgesics used for conditions such as cancer pain carry an increasing risk of tolerance and misuse with prolonged use, which has spurred research into "electroceuticals," devices that modulate nerves through electrical stimulation as an alternative to drugs.
However, existing electroceuticals have limitations. Implantable devices require surgery, and skin-attached electrodes may fail to deliver electrical current properly depending on skin conditions such as sweat or dead skin cells. A concentrated current at specific sites can also raise skin temperature or pose a risk of burns.
Microneedles improve contact and safety
To address these issues, the research team developed a temperature-responsive, conductive and adhesive microneedle electrode (a fine needle electrode that conducts electricity well while adhering to the skin).
Because the microneedles penetrate the highly resistive stratum corneum, the device can deliver stable electrical stimulation while reducing the influence of sweat and dead skin cells. The team also coated the electrode with a conductive hydrogel (a gel-like material that retains a large amount of water) so that current spreads evenly rather than concentrating at the needle tips.
In addition to improving electrical performance, the electrode was designed with a built-in thermal safety mechanism. When skin temperature rises abnormally, the electrode's adhesion weakens and it detaches from the skin on its own, helping reduce the risk of skin burns that could occur during electrical stimulation.
Remote care and automatic response
Beyond the skin interface itself, the research team integrated the device with IoT-based remote management. Using a smartphone and cloud server, a health care provider can control the device's operating time and electrical stimulation in real time or on a scheduled basis, even when located far from the patient.
The team confirmed that the device could be remotely controlled even across long international distances, such as between Korea and the United States.
Following future clinical validation, this could develop into a home-based or remote pain-management approach in which patients use the electroceutical under medical supervision without needing to visit a hospital.
The platform further extends beyond remote control by enabling automatic operation based on the body's physiological state. Using a photoplethysmography (PPG) sensor (a technology that measures pulse and blood flow changes using light), the team detected pain-related stress states and, based on this, implemented a closed-loop (a method that automatically adjusts treatment while continuously checking the body's condition) therapy function that automatically triggers electrical stimulation.
Early results, with clinical questions ahead
The researchers evaluated the performance of the platform in both animal experiments and a small-scale human study. In animal experiments, current was delivered more effectively than with conventional gel electrodes, and pain-relieving effects were also confirmed.
In a small-scale study involving healthy adults, changes in skin sensory pain thresholds (the level of stimulation at which pain begins to be felt) following electrical stimulation were observed to assess the potential for application in humans.
However, direct analgesic effects in this study were confirmed only through animal experiments. The research team noted that further clinical studies are needed to confirm therapeutic efficacy and the safety of long-term use in actual chronic pain patients.
Jeong said, "By combining a stable skin interface with IoT-based remote management, we have expanded the potential for wearable electroceuticals in daily life. We hope that, following future clinical validation, this approach can evolve into a personalized digital health care platform that enables pain management tailored to each patient's condition."
Lee said, "We hope this research will be integrated with future wearable acupuncture technologies to contribute to the development of a new nonpharmacological pain-management approach that stimulates acupoints through electrical stimulation."
The study was co-first authored by Heesoo Kim, a Ph.D. student at KAIST, and Dr. Se Kyun Bang from KIOM.
Publication details
Heesoo Kim et al, Wireless IoT-enabled microneedle electroceutical for personalized and connected pain management, Nature Communications (2026). DOI: 10.1038/s41467-026-76527-y
Journal information: Nature Communications
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