The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 1986
Filed:
Apr. 23, 1981
Richard A Normann, Salt Lake City, UT (US);
University of Utah, Salt Lake City, UT (US);
Abstract
Apparatus for measuring the flow of blood or other liquids through a channel includes a flexible catheter on the exterior wall of which are mounted a heating coil and spaced therefrom, a thermistor. The catheter is placed in a channel in which the liquid flow is to be measured so that the thermistor is positioned downstream of the heating coil. The apparatus also includes a capacitor which is charged to a certain level by a power supply source and then periodically discharged to the heating coil to cause the coil to produce heat. The heating coil thus heats liquid flowing thereby and any temperature change is detected by the thermistor and supplied to temperature measuring circuitry. This circuitry determines the temperature change in the liquid caused by the heating coil, integrates this temperature change and takes the reciprocal of the integrated temperature change, and produces therefrom a measure of the liquid flow.