The Checkpoint Stimulator/Locator, developed by orthopedic surgeons and biomedical engineers from medical technology incubator company NDI Medical, is a small, hand-held device that allows doctors to electrically stimulate muscles and nerves during the operation, mapping their location and health. Designed to be used with one hand, the single-use device has a small probe at its front that allows the surgeon to highly target specific nerves, or test nerves and muscle tissue at varying depths through regional stimulation. The result is more complete neurological picture for doctors, and fewer complications for patients. Checkpoint was spun out from NDI Medical in August 2009 to market the new device.