RESEARCH ON THE DYNAMICS OF PULSATILE BLOODFLOW IN THE HUMAN PULMONARY ARTERIAL SYSTEM.
OXFORD UNIV (ENGLAND) RADCLIFFE INFIRMARY
Pagination or Media Count:
The development of an apparatus to enable continuous measurement of pulmonary capillary bloodflow to be made in man during simultaneous intravascular pressure measurements was completed. A pneumatic flowmeter was made for use with the whole body plethysmograph. This instrument can rapidly record the rate of change of gas volume occurring within the plethysmograph as a result of gas exchange taking place within the lungs of a human subject lying within the chamber. The device consists essentially of a pneumatic servo system which detects any change in ambient pressure inside the body plethysmograph and appropriately injects or extracts air from the plethysmograph to restore the initial pressure state within the chamber. The rate of injection or removal of air needed to accomplish this is recorded by a standard electromanometer measuring the pressure change that develops across a linearly calibrated resistance graticule on the servos feedback line to the plethysmograph. In its finally designed form the plethysmograph-flowmeter system has a uniform frequency response from 0-12 cycles per second and a linear range from 0-200 mls. per second. Instrument design and development was completed in November 1960. Author
- Anatomy and Physiology
- Medical Facilities, Equipment and Supplies