04120294 is referenced by 89 patents and cites 9 patents.

A wristband having inner and outer sensing electrodes capable of acquiring signals from bipolar limb leads and being electrically associated with electronics capable of processing such signals in a form representative of the electrical activity of the heart. The inner electrode is in continual electrical contact with the skin of the wrist upon which the band is worn. The outer electrode is isolated from the inner electrode and includes an outer portion exposed for contact by the fingers of the wearer's opposite hand. When such finger contact with the outer electrode is made, the bipolar circuit is completed and the ECG skin potential signals are sensed at the electrodes. The signals are processed to produce a digital indication of heartbeat rate, or other signal representative of heart activity.

Title
Electrode system for acquiring electrical signals from the heart
Application Number
5/718017
Publication Number
4120294
Application Date
August 26, 1976
Publication Date
October 17, 1978
Inventor
Donna L Wolfe
32511 Sea Island Dr., Laguna Niguel, 92677
CA, US
Agent
Tilton Fallon Lungmus & Chestnut
IPC
A61B 5/02
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