An Assessment of Fequency Characteristics of the Fluid-Filled Catheter-Manometer System
A pulmonary artery pressure waveform observed on the screen is an end-product of the force applied to the tip of the catheter subjected to various distortions as it travels down through the mass of fluid in the lumen with its inherent inertial, frictional and elastic moments. The aim of this study is to construct a system of evaluation of the distortion in the pressure waveforms in terms of amplitude and phase angle. The experimental setup consists of the pressure source (a loudspeaker), measurering chamber (a dome) which is open to the reference transducer and the second transducer through the length of the pulmonary artery catheter. The pressure output of the latter is fed to the personal computer through an AD converter and are plotted against frequency.