Patent ID: 8142359

Claim:
For an implant associated with 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 with a frequency based upon the first frequency 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 received portion of the acoustic beam; filtering the second signal with a frequency selective filter to produce a third signal; transmitting an electromagnetic signal based upon the first electrical signal to an external system; filtering the first electrical signal with a frequency selective filter to produce a fourth electrical signal; generating a fifth electrical signal based upon the third electrical signal and the fourth electrical signal; and transmitting an electromagnetic signal based upon the fifth electrical signal to the external system.