Pattern interference radiation force (PIRF) neural stimulators

Apparatus for modifying neural activity, the apparatus comprising:

• two or more acoustic transducers configured to have their acoustic outputs overlap in a region of a patient under treatment;
• a controller configured to control operation of the acoustic transducers;
• wherein the controller is configured to allow a user of the apparatus to select from at least a first operating mode and a second operating mode;
• wherein the first operating mode is a standing wave mode, and wherein the acoustic outputs of the standing wave mode are at the same frequency;
• wherein the second operating mode is an oscillating mode where the acoustic outputs have pairwise frequency differences in a range from 1 kHz to 100 kHz,
• wherein the controller is configured to drive the two or more acoustic transducers independently of each other, whereby electronic control of an acoustic interference pattern generated by the two or more acoustic transducers is provided in the region of the patient;
• wherein the two or more acoustic transducers include two diametrically opposed acoustic transducers.