Patent ID: 8128566

Claim:
For an implant for implantation into a biological structure having a fluid flow of an average velocity with surfaces traveling with substantially the average velocity in the fluid flow through the biological structure, a method comprising: generating a first electrical signal having a first frequency; transmitting an acoustic beam based upon the first electrical signal into the fluid flow; receiving a reflected portion of the acoustic beam reflected off of a portion of the surfaces traveling in the fluid flow; producing a second electrical signal based upon the portion of the acoustic beam; receiving a third electrical signal based upon the second electrical signal; receiving a fourth electrical signal based upon the first electrical signal; outputting a mixed fifth electrical signal based upon the third electrical signal and the fourth electrical signal; receiving triggering events based upon the fifth signal; generating bursts of RF oscillation based upon the received triggering events; and transmitting an electromagnetic signal containing pulses based upon the bursts of RF oscillation and transmitting an unmixed electromagnetic signal based on the first electrical signal.