04449537 is referenced by 10 patents and cites 8 patents.

A respiration monitor for detecting effective respiration of a patient includes circuitry for suppressing the indication of unwanted signals due to heart activity, noise and flat breathing. A first threshold circuit is provided for increasing the sensitivity of the respiration monitor in response to a decreasing amplitude of the measured respiration signals. A first comparator circuit provides a fixed amplitude threshold below which detected signals are fully neglected. A second threshold circuit provides an adjustable amplitude threshold for the measured respiration signal, which threshold is raised in response to a decreasing respiration frequency below a predetermined frequency limit. Effective respiration is indicated only if all the aforementioned amplitude thresholds are exceeded.

Title
Respiration monitor
Application Number
6/355961
Publication Number
4449537
Application Date
March 8, 1982
Publication Date
May 22, 1984
Inventor
Frank Rochlitzer
Altdorf
DE
Gerhard Pross
Weil im Schonbuch
DE
Agent
Stephen P Fox
Assignee
Hewlett Packard
DE
IPC
A61B 5/05
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