Patent ID: 7857766

Claim:
A system for preventing restenosis following placement of a stent in a vessel of a patient, said system comprising: two or more implantable devices configured for implantation via injection in sites proximate to the stent, wherein each said implantable device is electrically powered and comprises controller circuitry and an ultrasonic emitter configured to emit an ultrasonic wave at a determined frequency, said ultrasonic emitter activated by said controller circuitry in response to an externally-provided command signal that is individually addressable to each of said implantable devices, said two or more implantable devices configured for wireless communication; and an externally-placed control device in wireless communication with said two or more implantable devices for providing said addressable command signals to each of said implantable devices to control the relative phase of each of said emitted ultrasonic waves to enable said ultrasonic waves to constructively add to induce mechanical vibrations in the stent to minimize plaque buildup on the stent.