Apparatus and method for recording and playing back electrocardi

Details Apparatus and method for recording and playing back electrocardi Apparatus and method for recording and playing back electrocardi

1978-06-23

1980-07-08

Kamm, William E.

Surgery

Truss

Pad

128711, 346 33ME, A61B 504

Patent

active

042112389

ABSTRACT:
A system for encoding, recording, playing back, decoding, validating, and displaying cardiac signals obtained from a patient during ambulatory monitoring. The system permits the recording on a single track in a magnetic tape of a channel of ECG signals interrupted intermittently by blood pressure signals, time of day signals, and event marker signals. The ECG signal is recorded in analog form, but the other signals are recorded as pulse coded signals each having its own format. In the playback apparatus, decoders identify and verify each of the signals when they occur, and the played back information is plotted on a chart. If the time of day signal was not recorded on the tape, timing information can be produced by the playback apparatus from the cumulative tape travel. Fiducial signals introduced in the recording, playback, and charting operations are used in a method for identification and measurement of recording tape speed error, playback tape error, and plotter speed error.

REFERENCES:
patent: 3572316 (1971-03-01), Vogelman et al.
patent: 3830228 (1974-08-01), Foner
patent: 3946744 (1976-03-01), Auerbach
patent: 4006737 (1977-02-01), Cherry
patent: 4033336 (1977-07-01), Murawski et al.
patent: 4073011 (1978-02-01), Cherry et al.
McKinnon, "Proceedings of Biotelemetry II 2nd International Symposium," Davos Switzerland, 20-24, May 1974, pp. 67-70.

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