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Pflügers Archiv

, Volume 372, Issue 1, pp 109–111 | Cite as

A system for intravascular, radially orientation-independent electromagnetic flow- and diameter-sensing

  • Alexander Kolin
Heart, Circulation, Respiration and Blood; Environmental and Exercise Physiology Instruments and Techniques

Summary

The difficulty of optimally orienting an intravascular loop probe of an extracorporeal field electromagnetic flow meter is circumvented by uniting 2 mutually perpendicular loop sensors into a single flow-diameter probe. When one of the loops is unfavorably oriented in the magnetic field, the orientations of the other loop is more favorable. The most unfavorable case is a 45° angle between the magnetic field and the planes of the loops, when the signal drops to 70.7% of the optimal value. By taking the square root of the sum of the squares of the 2 loop transducer signals, one obtains an output for flow and diameter measurements which is independent of the probe orientation. This operation can be accomplished electronically.

Key words

Flow meter Electromagnetic flow meter Blood flow Diameter Vascular diameter Catheter flow meter Angiometer 

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References

  1. Kolin, A.: A new approach to electromagnetic blood flow determination by means of catheter in an external magnetic field. Proc. Natl. Acad. Sci. U.S.A.65, 521–527 (1970)Google Scholar
  2. Kolin, A.: Recent trends in approaches to electromagnetic determination of blood flow and outlooks for the future. In: Modern techniques in the physiological sciences, pp. 81–108 (Gross, J. R., Kaufmann, R., Wetterer, E., eds.). New York: Academic Press 1973Google Scholar
  3. Kolin, A., MacAlpin, R. N.: Induction angiometer: Electromagnetic magnification of vascular diameter variations in-vivo. Blood Vessels14, 141–156 (1977a)Google Scholar
  4. 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. Pflügers Arch.337, 257–267 (1972)Google Scholar
  5. Kolin, A., MacAlpin, R. N., Steckel, R. J.: Electromagnetic rheoangiometry: An extension of selective angiography. Am. J. Roentgenol. (in press, 1977)Google Scholar
  6. Kolin, A., Steele, J. R., Imai, J. S., MacAlpin, R. N.: A constant field interrupted resonance system for percutaneous electromagnetic measurement of blood flow. Proc. Natl. Acad. Sci. U.S.A.71, 1294–1298 (1974)Google Scholar
  7. MacAlpin, R. N., Kolin, A., Stein, J. J.: The external field intravascular electromagnetic flow meter system as applied to standard angiographic catheters and conscious humans. Catheterization & Cardiovasc. Diagnosis2, 23–27 (1976)Google Scholar

Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • Alexander Kolin
    • 1
  1. 1.School of MedicineUniversity of CaliforniaLos AngelesUSA

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