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An implantable blood pressure and flow transmitter.A miniature totally implantable FM/FM telemetry system has been developed to simultaneously measure blood pressure and blood flow, thus providing an appreciation of the hemodynamics of the circulation to the entire body or to a particular organ. Developed for work with animal subjects, the telemetry system's transmission time is controlled by an RF signal that permits an operating life of several months. Pressure is detected by a miniature intravascular transducer and flow is detected by an extravascular interferometric ultrasonic technique. Both pressure and flow are calibrated prior to implanting. The pressure calibration can be checked after the implanting by cannulation; flow calibration can be verified only at the end of the experiment by determining the voltage output from the implanted sensing system as a function of several measured flow rates. The utility of this device has been established by its use in investigating canine renal circulation during exercise, emotional encounters, administration of drugs, and application of accelerative forces.
Document ID
19730030043
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rader, R. D.
Meehan, J. P.
Henriksen, J. K. C.
(Southern California, University Los Angeles, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Publication Information
Publication: IEEE Transactions on Biomedical Engineering
Volume: BME-20
Subject Category
Instrumentation And Photography
Accession Number
73A14845
Funding Number(s)
CONTRACT_GRANT: NSR-05-018-087
Distribution Limits
Public
Copyright
Other

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