The present invention provides an apparatus and methods for continuous intravascular measurement of whole blood concentration, blood pressure, and pulse pressure. The intravascular catheter incorporates a sensor to measure whole blood sound velocity, attenuation, backscatter amplitude, and blood flow...http://www.google.es/patents/US7559894?utm_source=gb-gplus-sharePatente US7559894 - Multiparameter whole blood monitor and method
