The device can chill nerves as small as a few millimeters across, but more testing and modifications are necessary before it could relieve pain in humans.
Multiple clinical trial participants who have severe spinal injuries were able to stand, walk, and perform specific activities after just one day of using an implant surgically embedded in their spines.
Patients in a small trial said their chronic pain improved an average of 90 percent over the course of 15 days, but returned shortly after the electrical stimulation sessions ended.
The effects of the therapy in a small group of patients were long-lasting, researchers say, adding to evidence that the approach works for treatment-resistant depression.
Two chips implanted in a quadriplegic patient’s motor cortex and 36 electrodes in his right arm allow the man to control the movement of his right arm and hand.