Surgery – Truss – Pad
Patent
1989-11-02
1991-01-15
Jaworski, Francis
Surgery
Truss
Pad
A61B 802
Patent
active
049845764
ABSTRACT:
A circuit for heartbeat detection derives the heartbeat frquency from ultrasonic signals reflected from the heart and frequency-shifted due to the Doppler effect. The circuit allows for the automatic determination of the distance between the heart and an ultrasonic transducer located on the body of the patient, so that the evaluation of the reflected ultrasonic signals can be limited to a small body range and spurious signals from other ranges can be suppressed. The circuit comprises at least two channels which are enabled by a transmitting/receiving control circuit during receiving intervals for receiving and further processing the reflected ultrasonic signals. The receiving intervals of the different channels are time shifted toward one another so that the respectively received ultrasonic signals originate from different depth ranges within the body. A comparison circuit compares the strengths of the signals corresponding to the heartbeat during each heartbeat period in the individual channels, and thus derives a gradient which indicates the direction in which the receiving intervals or transmit windows are to be shifted during the subsequent heartbeat period in order to localize the heart.
REFERENCES:
patent: 3561430 (1971-02-01), Filler, Jr. et al.
Rapoport et al., "A pilot clinical pep monitor", IEEE Transactions on Biomedical Eng. vol. BME-26, No. 6, Jun. 1979, pp. 345-349.
Schraag Martin
Schulenberg Andreas
Hewlett--Packard Company
Jaworski Francis
Perillo Frank R.
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