Surgery – Truss – Pad
Patent
1983-03-17
1985-01-22
Kamm, William E.
Surgery
Truss
Pad
128902, A61B 504
Patent
active
044945523
ABSTRACT:
A monitoring electrode system is provided in which just two electrodes and their corresponding lead lines may be utilized for a monitoring unit, such as an ECG, having three input terminals and normally requiring signals from three electrodes. To achieve such a two lead system, a body tissue impedance simulating circuit is included to provide an automatic reference line signal at the third input terminal. Protection against high voltages and radio frequency interference is provided by various circuits, such as a high voltage protection circuit, a low pass filter network or an RF choke filter network. In the preferred embodiment hereof, a pair of electrodes are provided with a connecting plug which engages a corresponding connector at the end of a cable extending from the ECG monitor. Preferably, the body tissue impedance simulating circuit and any protective circuits are located in the connector at the end of the ECG cable.
REFERENCES:
patent: 3568663 (1971-03-01), Phipps
patent: 3631851 (1972-01-01), Hesen
patent: 3709212 (1973-01-01), Koeblitz
patent: 3865101 (1975-02-01), Saper et al.
patent: 3971366 (1976-07-01), Motoyama
patent: 4027663 (1977-06-01), Fischler et al.
patent: 4094310 (1978-06-01), McEachern et al.
patent: 4109223 (1978-08-01), Tenkman et al.
Huntsman et al., "IEEE Transactions on Biomedical Engineering", vol. 18, No. 4, Jul. 1971, pp. 301-302.
Kamm William E.
R2 Corporation
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