System and method of monitoring breathing

摘要

Sidestream sampling of gas to determine information related to the composition of gas at or near the airway of a subject is implemented. From such information one or more breathing parameters of subject 12 (e.g., respiratory rate, end-tidal CO2, etc.) are determined, respiratory events (e.g., obstructions, apneas, etc.) are identified, equipment malfunction and/or misuse is identified, and/or functions are performed. To improve the accuracy of one or more of these determinations, information related to pressure at or near the airway of subject is implemented. This information may include detection of pressure at or near a sidestream sampling cell.

主权项

1. A system configured to monitor the breathing of a subject, the system comprising:
a sample cell in fluid communication with a conduit that communicates with an airway of the subject, wherein the conduit is placed in fluid communication with the airway of the subject by an interface appliance that engages the airway of the subject, wherein the sample cell is configured to exhaust gas received into the sample cell from the conduit; a composition detector configured to generate output signals conveying information related to composition of the gas received into the sample cell from the conduit; a pressure detector configured to generate output signals conveying information related to pressure within the conduit; computer program modules that comprise:
a breath identification module configured to identify breathing based on the output signals generated by the pressure detector;an interface classification module configured to perform a determination of an interface appliance type of the interface appliance based on the output signals generated by the pressure detector; anda breathing parameter module configured to determine one or more breathing parameters (i) based on the output signals generated by the composition detector, and (ii) based on one of (ii.a) the breathing identified by the breath identification module and (ii.b) the determination by the interface classification module as to the interface appliance type of the interface appliance; and one or more processors configured to execute the computer program modules, wherein the interface classification module is configured to determine the interface appliance type from sizes of pressure variations conveyed by the output signals generated by the pressure detector.