The glove-like device delivers subtle vibrations, relieving painful hand contractions in patients with chronic stroke.
Researchers at Stanford University and Georgia Tech have developed a wearable device that straps around the wrist and hand, delivering subtle vibrations that may relieve"The vibro-tactile stimulation can be used at home, and we're hoping it can be relatively low cost," said senior study authorFor now, the device is available only to clinical trial patients. But the researchers hope to get the glove into — or rather onto — more patients' hands within a few years.
Spasticity often develops or worsens months after a stroke. By then, patients may have run out of insurance coverage for rehabilitation. And the effectiveness of Botox injections can "wear out over time," Okamura said., patients wore the device for 3 hours a day for 8 weeks, while doing their usual activities. The researchers continued testing their spasticity for 2 more weeks. Symptom relief continued or improved for some patients, even after they stopped using the device.
"The stimulation is sending additional sensory signals to the brain, which helps the brain interpret and reconnect any lost circuits," Okamura said. "Immediately, we do see some softening of the muscles," Okamura said. "But in our longer-term study, where we compared to Botox, I also think that the vibration may be retraining the brain to send inhibitory signals. And that can restore balance that's lost due to the damaged neural circuits from a stroke."comparing the effects of muscle and skin stimulation, they hypothesized that the vibration could be having a biomechanical effect on the muscle.
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