Medical device with EMI detection and cancellation

Details Medical device with EMI detection and cancellation Medical device with EMI detection and cancellation

1995-04-14

1996-10-15

Jaworski, Francis

Surgery

Truss

Pad

12866108, A61B 505, A61B 806

Patent

active

055644201

ABSTRACT:
A Doppler flowmeter, which is capable of distinguishing reflected Doppler signals from spurious electrical interference signals, is provided with a multi-frequency transmitter, adapted to be coupled to a conduit through which liquid constituents may flow, for transmitting a first transmitted signal at a first frequency into the conduit during a first period of time and a second transmitted signal at a second frequency into the conduit during a second period of time, the second frequency being substantially different than the first frequency. The flowmeter includes a receiver for receiving signals including a first received signal received during the first period of time and a second received signal received during the second period of time, the first received signal having a third frequency and the second received signal having a fourth frequency. The flowmeter includes a Fourier transform which generates a first difference signal based upon a first frequency difference between the first and third frequencies and a second difference signal based upon a second frequency difference between the second and fourth frequencies. The flowmeter includes means for determining whether the first frequency difference substantially differs from the second frequency difference and means for generating a flow signal based only upon difference signals which have a frequency difference substantially equal to the transmission frequency difference.

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A submission dated Jul. 16, 1991 by Sarns 3M Healthcare to the Food and Drug Administration regarding a Delphin II Centrifugal System embodying the invention disclosed in U.S. Pat. No. 5,368,554.

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