Cardiac monitoring apparatus

Surgery – Truss – Pad

Patent

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Details

128690, 128639, 128644, A61B 504

Patent

active

042301270

ABSTRACT:
There is disclosed herein a wristwatch size cardiac monitoring apparatus which is worn on the wrist of one arm. A conductive material housing acts as one electrode when held firmly in contact with the wrist of the arm on which it is worn. A finger of the other limb is placed on a receiving electrode of the casing which acts as the second electrode. Together, these two electrodes provide a Lead I electrocardiac signal to electronics within the housing. The second electrode consists of a metal layer on which is placed a dielectric material and when the finger is placed on top of the dielectric material, a capacitor is formed and the electric signal on the finger is transferred to the metal layer. Additionally, there is described circuitry which is used to operate the rate monitor. This circuitry includes means for detecting a QRS complex and for causing a count in beats per minute to be displayed, manifesting the heartbeat rate. The circuitry includes means for updating the heartbeat rate displayed every two seconds and for automatically turning the system off when no heartbeats are detected for a six second interval.

REFERENCES:
patent: 3568662 (1971-03-01), Everett et al.
patent: 3606881 (1971-09-01), Woodson
patent: 3628527 (1971-12-01), West
patent: 3863626 (1975-02-01), Huber
patent: 3924639 (1975-12-01), Hess
patent: 4033355 (1977-07-01), Amundson
patent: 4120294 (1978-10-01), Wolfe
Miller, H. A. et al., "Biomedical Electrode Technology Theory & Practice," Academic Press Inc., 1974, pp. 5-93.

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