Research on the Dynamics of Pulsatile Blood Flows in the Human Pulmonary Arterial System

摘要

An apparatus was designed to combine continuous blood flow measurement with continuous pulmonary vascular pressure measurement in an attempt to investigate the pulsatile pressure-flow relationships in the pulmonary arterial system of man. A sensitive meter measuring gas flow directly employs a pneumatic amplifying system and is virtually drift free. The flow meter design is essentially a pneumatic servo mechanism maintaining a constant pressure within the plethysmograph. Changes in plethysmograph pressure are sensed by a sensitive diaphragm, movement of which is detected by a fine nozzle and pneumatic amplifier unit. Air is then supplied back to the plethysmograph by the amplifier output until the diaphragm position is restored. (Author)