Abstract: A bone stimulator (30,40,50,610,810,910), a bone stimulation system (200,600,800, 900) and method for bone fracture healing of a broken bone (930,830,630,55) in a body, which can speed up the healing rate. Accordingly, ultrasound (214) is used by the present system to power up the implanted bone stimulator (30,40,50,610,810, 910) for generating a stimulating electric current passing through a broken area (931, 831,631,56) in the broken bone (930,830,630,55) for bone fracture healing.

Abstract: A method for ultrasound stimulation of spinal cord, the method comprising at least two stimulation cycles, each comprising the steps of: a) obtaining a first real-time spinal cord using a first set of ultrasound transducers; b) selecting a pre-determined stimulation area of the spinal cord from the first real-time spinal cord; c) calculating the position and orientation of the selected stimulation area relative to a second set of ultrasound transducers; and d) stimulating the selected stimulation area of the spinal cord at the calculated relative position and orientation using the second set of ultrasound transducers.