Patent ID: 7364552
Filing Date: 2008-04-29
Classification: A61M

Abstract:
1. A method for determining the concentration of propofol (2,6-diisopropylphenol) in a respiratory flow, the method comprising: providing a breathing gas line; providing an evaluating unit; providing a breathing gas sensor in fluid connection with said breathing gas line and connected to said evaluating unit; determining a parameter of respiratory flow using said gas sensor and transmitting a signal to said evaluating unit related to the determined parameter; providing a propofol sensor in fluid connection with said breathing gas line and connected to said evaluating unit, wherein said propofol sensor is an electrochemical gas sensor with a measuring electrode made of diamond-like carbon; providing a pump in fluid connection with said propofol sensor, downstream of said propofol sensor for drawing a gas sample from said breathing gas line through said propofol sensor; actuating said pump by said evaluating unit for sampling breathing gas; and transmitting a measured signal for a concentration of propofol from said propofol sensor to said evaluating unit.