Patent ID: 7905836
Filing Date: 2011-03-15
Classification: A61B,A61N

Abstract:
1. A method of using ultrasound waves focused at a specific location in a medium to cause localized production of microbubbles at said location, to control said production, and to control cavitational and heating effects that take place at said location, the method comprising: providing multiple ultrasonic transducers; focusing the transducers at said location; simultaneously directing ultrasound waves from the transducers at said location; and selecting a range of parameters of the ultrasound waves being directed from the multiple ultrasonic transducers focused at said location in order to induce cavitation, and to produce from interference of the ultrasound waves at said location a combined waveform: wherein said combined waveform comprising a spatial and/or temporal combination of two waveforms—one waveform comprising high negative peaks and small positive peaks and the second waveform comprising high positive peaks and only small negative peaks, said combined waveform allowing control of size distribution of the microbubbles and temporal changes of the distribution.