05191891 is referenced by 107 patents and cites 14 patents.

A portable apparatus having electronic circuitry for selectively monitoring and recording a user's ECG signals, wherein a first conductive electrode is disposed on a first surface of the apparatus casing for contact with an ECG lead position on the user's body and second and third electrodes are disposed on at least one other surface of the casing for ease of contact by a thumb and finger, respectively, of the user's hand. One of the second and third electrodes provides a ground signal source for the electronic circuitry. A wristband is provided for securing the apparatus to the user's wrist and a microprocessor controls the electronic circuitry such that the user's ECG signal is monitored/recorded only when the user grasps the second and third electrodes. A separate modem device is attachable to the apparatus for effecting burst mode transmission of data to an external receiver.

Title
Portable ECG monitor/recorder
Application Number
7/757254
Publication Number
5191891
Application Date
September 10, 1991
Publication Date
March 9, 1993
Inventor
William H Righter
Aloha
OR, US
Agent
Leydig Voit & Mayer
Assignee
Ralin
IL, US
IPC
A61B 5/02
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