Vascular pneumatic constrictor for in vivo calibration of electromagnetic flowmeters.

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Abstract
Calibration of flowmeters requires 0 flow conditions. A vascular constrictor device is described which allows calibration of the flowmeter after implantation of the blood flow probe. It is constructed of Silastic in the shape of a hollow sphere through which the artery runs. Expansion of a balloon inside the sphere is the occlusive mechanism. Because of this mechanism, overexpansion of the balloon is eliminated, thereby increasing the life of the balloon. This device has simple design and thus can be made to accommodate vessels of various sizes. Cardiovascular research owes many of its signal achievements to the development of equipment which can accurately measure blood flow. The flowmeters now in use unfortunately require a period of zero blood flow for calibration. If this calibration can be done after the blood flow probe has been placed in the animal, a source of experimental error can thus be removed.

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