TRANSIT TIME ULTRASONIC FLOW MEASUREMENT
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United States of America Patent
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Issued Date -
Jun 4, 2009
app pub date -
Nov 28, 2008
filing date -
Nov 30, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A transcutaneous energy transfer system with subcutaneous non coupled coils is used to transmit power and signals to an implanted biological support device or sensor, such as a flow sensor for measuring relatively low flow rates, such as hydrocephalic shunt flow. The flow sensor is configured to convert a shear wave generated by a transducer to a longitudinal wave at the interface of a signal pathway and the flow, wherein the longitudinal wave travels parallel to the flow and exits a flow channel to convert to a shear wave which intersects a second transducer. The transcutaneous energy transfer employs a pair of inductive coupling coils, wherein the coils are disposed in zero coupling orientation which can include a perpendicular orientation of corresponding coil axes.
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