Improved Apparatus and Technique for Electromagnetic Determination of Blood Flow

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Abstract
The paper describes improvements in the method of measuring blood flow by electromagnetic induction in intact blood vessels left in their normal place. ``Pick‐up sleeves'' and ``occlusion cuffs'' are described which can be implanted permanently into the animal without causing irritation. A method of finding the optimum position of the blood vessel in the magnetic field and of determining the strength of the utilized magnetic field component is outlined. It is shown that calibration of individual blood vessels is unnecessary; a given apparatus is calibrated once and for all by one single flow measurement in vitro. The design of the compensator is simplified. A method for compensating disturbances encountered with blood vessels which are agitated in the magnetic field is described. Various sources of electromagnetic disturbances and means of eliminating them are discussed.