A fiber optical fiber fluid flow measuring device is provided for in vivo determination of blood flow in arteries. The device includes a fiber optical fluid differential pressure measuring device having at least one optical fiber sensor which optical fiber sensor is positioned in the blood flow passage...http://www.google.se/patents/US4873989?utm_source=gb-gplus-sharePatent US4873989 - Fluid flow sensing apparatus for in vivo and industrial applications employing novel optical fiber pressure sensors
