A Constant-Field Interrupted Resonance System for Percutaneous Electromagnetic Measurement of Blood Flow
- 1 April 1974
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 71 (4), 1294-1298
- https://doi.org/10.1073/pnas.71.4.1294
Abstract
A combination of deformable flow probes of negligible lateral dimensions with an electronic circuit capable of providing a prolonged plateau of dB/dt = 0 and of sampling the flow signal at the end of this interval permits electromagnetic measurement of blood flow with a reliable zero base line secured by switching off the magnet. An extracorporeal magnet provides the magnetic field. The flow transducer is introduced into the vascular system percutaneously through a standard angiographic catheter by conventional technique. The idea of the current generator can be described as "principle of interrupted resonance." The current wave form can be described as a sequence of disconnected bisected sine waves joined at the apices by horizontal current plateaus where di/dt is strictly zero.Keywords
This publication has 5 references indexed in Scilit:
- External field electromagnetic measurement of blood flowPflügers Archiv - European Journal of Physiology, 1972
- Miniature hydraulic occluder for zero blood flow determination.Journal of Applied Physiology, 1971
- Determination of Arterial Blood Flow by Percutaneously Introduced Flow Sensors in an External Magnetic Field, II. Implementation of the Method In VivoProceedings of the National Academy of Sciences, 1971
- EVOLUTION OF ELECTROMAGNETIC BLOOD FLOWMETERSPublished by University of California Press ,1970
- MINIATURIZATION OF THE ELECTROMAGNETIC BLOOD FLOW METER AND ITS USE FOR THE RECORDING OF CIRCULATORY RESPONSES OF CONSCIOUS ANIMALS TO SENSORY STIMULIProceedings of the National Academy of Sciences, 1959