Pressure Regulation in a Mechanical Breathing Aid
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2003-Jul-23
Background In order to regulate patient pressure, particularly in a pressure controlled mode of ventilation, it is common to employ a control algorithm that uses both inspira- tion and expiration pressure signals simultaneously. Since the pressure measurements are made in differ- ent locations a large time difference exists between inspiration and expiration pressure readings. Moreo- ver, the time difference is also dependent on the lengths of tubing used in the inspiration and expira- tions sides of the external pneumatic circuit that connects a patient to the breathing aid. Thus the time difference can typically vary from one or two milli- seconds to several tens of milliseconds.