Apparatus for automatically monitoring body functions
First Claim
Patent Images
1. A respiration indicator comprising:
- operator-actuated switch means having at least two states;
impedance pneumograph means for determining an impedance signal related to changes in impedance of a living subject;
threshold means responsive to the operator-actuated switch means for producing a signal indicative of the average value of the impedance signal during a base period interval; and
comparator means for indicating an inspiration when the ratio between the threshold value signal and the impedance signal exceeds a predetermined proportionality factor.
1 Assignment
0 Petitions
Accused Products
Abstract
A respiration monitor for use in an apnea monitor is disclosed in which a threshold value signal is automatically generated proportional to the average value of the monitored impedance of the subject during a base period selected by the operator. A comparator circuit operates to indicate respiration when the ratio between the threshold value signal and the impedance signal reaches a predetermined proportionality factor.
-
Citations
21 Claims
-
1. A respiration indicator comprising:
-
operator-actuated switch means having at least two states; impedance pneumograph means for determining an impedance signal related to changes in impedance of a living subject; threshold means responsive to the operator-actuated switch means for producing a signal indicative of the average value of the impedance signal during a base period interval; and comparator means for indicating an inspiration when the ratio between the threshold value signal and the impedance signal exceeds a predetermined proportionality factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15)
-
-
12. An improved respiration monitor, of the type including impedance pneumograph means for generating an impedance signal related to changes in impedance of a living subject, means for displaying the impedance signal, and a comparator responsive to the impedance signal and a threshold limit signal for generating an output indicative of respiration, wherein the improvement comprises:
-
automatic threshold limit generating means responsive to the impedance signal for generating the threshold limit signal proportional to an average value of the impedance signal during a selected base period interval; and means for altering at least one of the signals applied to the comparator by a selected proportionality factor. - View Dependent Claims (13, 14, 16, 17, 18, 19, 20, 21)
-
Specification