Physiological occurrence, such as apnea, monitor and X-ray trigg

Details Physiological occurrence, such as apnea, monitor and X-ray trigg Physiological occurrence, such as apnea, monitor and X-ray trigg

1978-11-24

1981-09-15

Kamm, William E.

Surgery

Truss

Pad

A61B 500

Patent

active

042891426

ABSTRACT:
A respiration monitor and X-ray trigger apparatus wherein signals are generated indicative of respiration rate, respiration extrema, and heart rate. A trigger signal is selectively generated to the X-ray machine just prior to occurrence of a selected respiration extrema. The value of the respiration signal at a sample occuring just after detection of the selected extrema is stored, and modified in accordance with the resolution of the system. The X-ray trigger signal is generated, if not otherwise inhibited, upon detection of the next occurrence of the modified value in the respiration wave form. Apnea alarms are generated if a predetermined decrease in respiration rate is detected in successive periods in conjunction with a predetermined number of decelerating heart beats. An alarm is also generated if the respiration rate and heart rate signals appear to indicate that the respiration and heart rates are equal for a predetermined number of periods, or if the respiration or heart rates stray outside of preset threshold values. Provisions are included for adaptive DC offset, and to eliminate electromagnetic interference. Amplitude, time domain, and slew rate discrimination against artifacts are also provided.

REFERENCES:
patent: 3572317 (1971-03-01), Wade
patent: 3915154 (1975-10-01), Cosentino
patent: 3976052 (1976-08-01), Junginger
patent: 3991746 (1976-11-01), Hanna
patent: 3996922 (1976-12-01), Basham
Dyro, "Emergency Care Research Institute Publication #410-276", Jul. 1978, pp. 1-126.
Baker et al., "The American Journal of Medical Electronics", Apr.-Jun. 1965, pp. 73-77.

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