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Localized production of microbubbles and control of cavitational and heating effects by use of enhanced ultrasound

  • US 20070161902A1
  • Filed: 02/03/2005
  • Published: 07/12/2007
  • Est. Priority Date: 02/06/2004
  • Status: Active Grant
First Claim
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1. A method of using ultrasound waves focused at a specific location in a medium to cause localized production of bubbles at said location, to control said production, and to control the cavitational and heating effects that take place at said location;

  • wherein, said production and control is accomplished by selecting the range of parameters of multiple transducers focused at said location in order to produce one of the waveforms chosen from the following group;

    a waveform comprising high negative peaks and small positive peaks, said waveform encouraging the creation of a cloud of microbubbles;

    a waveform encouraging the production of heat and the limitation the growth and possible implosion of said microbubbles; and

    a 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 the size distribution of the microbubbles and temporal changes of this distribution.

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