Cardiac arrhythmia analysis system

Details Cardiac arrhythmia analysis system Cardiac arrhythmia analysis system

1982-05-24

1984-02-21

Kamm, William E.

Surgery

Truss

Pad

128419D, 128702, 128706, A61B 504

Patent

active

044323751

ABSTRACT:
A method and apparatus for analyzing cardiac electrical activity and other life signs, and triggering a therapeutic current. A signal representative of cardiac electrical activity is analyzed by two distinct analog circuits and a logic protocol is provided to indentify cardiac arrhythmia based on the outputs of the circuits and the presence or absence of respiration. One circuit employs comparison of the electrical signal with a previous peak value thereof, and is characterized by its tendency to double-count some QRS complexes. The other circuit compares the sum of the rectified and low-pass filtered signal plus the derivative of the signal to a reference level, and compares the rectified and filtered signal to a threshold level, to identify QRS complexes while largely ignoring ventricular fibrillation. Defibrillation is triggered if either the second circuit produces output pulses greater than or equal to 200 pulses per minute, or the first circuit produces output pulses greater than 200 pulses per minute and the second circuit produces pulses at a rate less than half the pulse rate of the first circuit. Pacing is triggered if both circuits produce pulses at a rate less than 25 pulses per minute. Tachycardia and/or ventricular fibrillation must be apparently identified several times, and lack of respiration must be established, within a predetermined time period in order for defibrillation to be triggered. Defibrillation is inhibited as a result of interference which could produce unreliable measurements.

REFERENCES:
patent: Re30750 (1981-09-01), Diack
patent: 3707959 (1973-01-01), Wilton-Daves
patent: 3841315 (1974-08-01), Kopp
patent: 3878833 (1975-04-01), Arneson
patent: 3927663 (1975-12-01), Russell
patent: 3998214 (1976-12-01), Garrison
patent: 4184493 (1980-01-01), Langer
patent: 4192318 (1980-03-01), Dam
patent: 4237903 (1980-12-01), Hofmann
Nat'l. Semiconductor Linear Application Handbook (1980), pp. AN20-8 and AN20-9.
Design of Microcomputers Based Medical Instr. (1981), Willis J. Tompkins & John G. Webster, pp. 136-139 & 412-415.
Applications of Operational Amplifiers, Gerald Graeme, pp. 111-112, (1973).

Affiliated with

Also associated with

Rating

Cardiac arrhythmia analysis system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cardiac arrhythmia analysis system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cardiac arrhythmia analysis system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1030965