Surgery – Truss – Pad
Patent
1979-11-28
1982-06-15
Michell, Robert W.
Surgery
Truss
Pad
7386125, A61B 1000
Patent
active
043345433
ABSTRACT:
A method of determining flow velocities by measuring the phase difference between Doppler signals derived from wave pulses and reflected by substantially the same reflector at two different times, the interval between the times being predetermined, a pair of electric signals being derived according to the method from each Doppler signal by modulation in quadrature, the signals jointly bearing information relating to the phase of the Doppler signal, and a device for performing the method. In order to make full use of the possible measuring range, even at a relatively poor signal
oise ratio, at least a first and a second pair of signals are combined to form a third pair of electric signals which together bear an item of information depending on the phase difference between the Doppler signals. Mean-value signals are formed, each corresponding to the mean value of one of the third pair of signals, and an output signal which corresponds to the mean value of the phase difference between the Doppler signals is derived from the mean-value signals. It is particularly advantageous to use the method in an ultrasound diagnostic device for determining the velocity profile of a flow, more particularly of blood in a blood vessel.
REFERENCES:
patent: 3914999 (1975-10-01), Grandchamp
Brondestini, M., "Topoflow-A Digital Full-Range Doppler Velocity Meter", IEEE Trans. on Sonics and Ultra-sonics, vol. SU-25, No. 5, Sep. 1978, pp. 287-293.
Hartley, C. J. et al., "A Single-Crystal UTS Catheter-Tip Velocity Probe", Jrnl. Assoc. Advancement Med. Instramentation, vol. 8, No. 4, Jul.-Aug. 1974, pp. 241-243.
Doriot, P. A. et al., "Quant. Anal. of Flow Cond. in Simu. Vessels & Large Human Arteries and Veins by Means of Ultrasound", Conf. Proc. Zd. Eur. Cong. on UTS in Med., Munich, 12-16 May 1975, pp. 160-168.
Grandchamp, P. A., "A Novel Pulsed Dir. Doppler Velocimeter: Phase Det. Profilometer," Conf. Proc. Zd. Eur. Cong. on UTS in Med., Munich, 12-16 May 1975, pp. 137-143.
Fehr, R. et al., "Pulsed UTS Doppler Velocimeter for Measuring Velocity Profiles by Analog Sig. Proc. Methods", Biomed. Technik, vol. 21, (supp.), Jun. 1976, pp. 289-290.
Brondestini, M., "A Digital 128-Channel Transcutaneous Blood-Flowmeter", Biomed. Technik, vol. 21, (supp.), pp. 291-292, Jun. 1976.
Brondestini, M., "UTS Blood Flowmeter Yielding Instantaneous Velocity Profile by Real Time Phase Det.", Elec. Letters, vol. 11, No. 8, pp. 183-184, 17 Apr. 1975.
Brondestini, M., "Appl. of Phase Det. Principle in a Transcut. Vel. Profile Meter," Conf. Proc. Zd. Eur. Cong. on UTS in Med., Munich, 12-16 May 1975, pp. 144-152.
Gould George M.
Hoffmann-La Roche Inc.
Jaworski Francis J.
Leon Bernard S.
Michell Robert W.
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