Measuring and testing – Volume or rate of flow – By measuring transit time of tracer or tag
Patent
1989-09-01
1991-02-26
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring transit time of tracer or tag
210 87, 210647, 604 4, 604 65, 604 67, G01F 1704
Patent
active
049952684
ABSTRACT:
Method and apparatus for determining the flow rate of blood passing between a patient and an extracorporeal therapy instrument. The flow measurement apparatus includes a delivery unit for producing a saline bolus interface at a first position of a measurement channel having a predetermined volume between the first and second position. A sensor unit included in the apparatus detects the saline bolus interface as it passes the second position in the channel. An output signal from the sensor unit along with an indication of the production of the saline bolus interface is utilized by a control unit to determine the blood flow rate. The control unit of the apparatus utilizes instantaneous and average blood flow algorithms to calculate instantaneous and average blood flow rates based on the time interval associated with the production of the saline bolus interface and its progression to a predetermined position in the measurement channel. Successive interfaces are also produced in the blood flow to derive an average blood flow rate.
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Ash Stephen R.
Echard Terrance G.
Ash Medical System, Incorporated
Goldstein Herbert
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