A bandage that generates its own electric current, with no wires, batteries to charge or machines to plug in, has helped wounds close nearly a third faster than untreated wounds in laboratory rats.
The device, called Wearable Disposable Electrotherapy, or WDE, looks and sticks to skin like an ordinary adhesive bandage, but hidden inside its thin layers is a printed battery and a pair of electrodes that deliver a gentle electrical current the moment it is applied, researchers report in BioRxiv. Wounds treated daily with the device reached the halfway point of healing about 2 days, or 29 percent, faster than wounds that received no active stimulation.
Doctors have known for decades that electricity can speed wound repair. Skin carries a natural electrical charge, and when it is broken, that charge redistributes itself around the injury, helping to summon the cells needed for repair. Applying outside electrical stimulation can reinforce this effect, but the equipment involved has typically been bulky, wired to an outlet, or reliant on batteries with limited and hard-to-control output.
The researchers say that mechanical disruption of the wound bed or clinical wound-care workflows has kept the therapy from becoming part of routine care.
To test whether a simpler, disposable version could work as well, the team created circular wounds on the backs of rats and sorted the animals into three groups. One group wore the self-powered WDE bandage, a second was treated with a conventional wired stimulator delivering a matched electrical dose, and a third wore an identical-looking bandage with no current at all, serving as a comparison. All three groups received their assigned treatment once a day for 13 days, and the wounds were photographed and measured daily to track healing.
Both electrically stimulated groups healed faster than the untreated group, and the self-powered bandage performed about as well as the wired stimulator.
“The device is self-powered and delivers a single electrotherapy dose simply by application to the skin,” the authors wrote, describing the central appeal of the design. When the researchers examined wound tissue under a microscope after 14 days, bandaged wounds that received current showed more collagen, a protein that gives healing skin its structure, along with greater numbers of cells linked to blood vessel formation and tissue remodeling, compared with the sham-treated wounds.
To understand why the current worked where it did, the team built a detailed computer model of skin structure down to the level of individual hair follicles and blood vessels. The simulation showed that electrical current does not spread evenly through tissue, instead concentrating around the wound’s edges and certain skin structures, which may help explain why healing accelerated specifically at the site of injury.
“Clinical trials are warranted to test the application of WDE spanning accelerated wound healing, long-term scar quality, functional recovery, pain management, or chronic or diabetic wounds,” they wrote.
Journal Reference: bioRxiv.
