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: electromagnetic, flow meter, catheter
Full text
PDF
Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Debley V. G. Miniature hydraulic occluder for zero blood flow determination. J Appl Physiol. 1971 Jul;31(1):138–139. doi: 10.1152/jappl.1971.31.1.138. [DOI] [PubMed] [Google Scholar]
- Kolin A. Evolution of electromagnetic blood flowmeters. UCLA Forum Med Sci. 1970;10:383–405. [PubMed] [Google Scholar]
- Kolin A., Grollman J. H., Jr, Steckel R. J., Snow H. D. Determination of arterial blood flow by percutaneously introduced flow sensors in an external magnetic field. II. Implementation of the method in vivo. Proc Natl Acad Sci U S A. 1971 Jan;68(1):29–33. doi: 10.1073/pnas.68.1.29. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kolin A., Kado R. T. MINIATURIZATION OF THE ELECTROMAGNETIC BLOOD FLOW METER AND ITS USE FOR THE RECORDING OF CIRCULATORY RESPONSES OF CONSCIOUS ANIMALS TO SENSORY STIMULI. Proc Natl Acad Sci U S A. 1959 Aug;45(8):1312–1321. doi: 10.1073/pnas.45.8.1312. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kolin A., MacAlpin R. N., Snow H. D., Lenz M. W. External field electromagnetic measurement of blood flow. An alternative approach to the solution of the baseline problem. Pflugers Arch. 1972;337(3):257–263. doi: 10.1007/BF00586849. [DOI] [PubMed] [Google Scholar]