Cardiotachometer

Details Cardiotachometer Cardiotachometer

1977-09-21

1980-01-01

Michell, Robert W.

Surgery

Truss

Pad

128690, 128706, A61B 502

Patent

active

041811348

ABSTRACT:
A cardiotachometer includes features which reliably filter out interfering background signals and provide for relatively low power consumption. A differential amplifier is connected to a three electrode input so as to effectively reduce common mode errors. The output of the differential amplifier is connected to an automatic polarity selecting circuit and an automatic gain control amplifier so as to make the unit as independent as possible from user adjustment. The device includes an eight bear counter for producing a single output pulse for every eight input pulses. The output of the eight beat counter is connected to a dual slope analog-to-digital converter for developing a display which is directly related to the average heart rate over a eight beat period and inversely related to the voltage applied to the circuit. A low power liquid crystal display is connected to the output of the dual slope circuit.

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Advertisement entitled "Exersentry"; Manufacturer is Respironics Inc., Middle Ave. at 3rd St., Wilmerding, Pa. 15148.
New York Times, "Patents: An Electronic System for Intravenous-Infusion Control", Aug. 6, 1977.
Runner's World, "Good News", Jul., 1977.
Advertisement entitled "Introducing the Basic Cardiac Diagnostic Instrument of the 70's.", Medcraft, Inc., Skippack, Pa.
Advertisement entitled "Dyna-Gram Recorder Model 5000", Cardio-Dynamics Laboratories, Inc., 12401 W. Olympic Blvd., L.A., Calif. 90064.
Advertisement entitled, "Phipps & Bird Bio-Monitor", Phipps & Bird, Inc., P.O. Box 2732A, Richmond, Va., Bulletin #7092-910-75.
Advertisement entitled "2D16 Pulsemeter", Medical Systems Corp., 230 Middle Neck Rd., Great Neck, N.Y. 11021.
Advertisement entitled "FJC-7110 Mini-ECG Series", manufactured by Fukuda Denshi Ltd.
Advertisement entitled "Heart Patient Monitor-Model (ECC1-50 B", Fukuda Denshi Co., Ltd.
Advertisement entitled "One Pound Cassette Recorder", Clinical Data, Inc., 358 Chestnut Hill Ave., Box 430, Brookline, Mass.
Electronics Magazine, "Consumer", p. 32, Apr. 28, 1977.
IEEE Transactions on Biomedical Engineering, "Triboelectric Interference in the ECG", by D. H. Gordon, BME-22-#3, pp. 252-255.

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