Compensation of volumetric errors in a gas monitoring system
First Claim
1. A mainstream gas monitoring system comprising:
- (a) a mainstream airway adapter; and
(b) a gas sensing assembly associated with the mainstream airway adapter and comprising;
(1) a gas sensing portion associated with the mainstream airway adapter, wherein the gas sensing portion outputs a signal indicative of an analyte in a gas flow in the mainstream airway adapter, and(2) a processing portion adapted to receive the signal from the gas sensing portion, wherein the processing portion is programmed to determine an amount of the analyte in the gas flow based on the signal from the gas sensing portion, and wherein the processing portion is programmed to compensate for volumetric differences between the gas flow during inspiration and the gas flow during expiration,wherein the processing portion compensates for the volumetric differences by monitoring a tracheal dead space gas and using the monitored tracheal dead space gas to determine the amount of the analyte in the gas flow, andwherein the monitored tracheal dead space gas comprises a first portion of gas exhaled during the expiration.
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Accused Products
Abstract
A mainstream gas monitoring system and method that includes a using a mainstream airway adapter, and a gas sensing assembly associated with the mainstream airway adapter to measure an analyte of a gas flow through the adapter. A gas sensing portion outputs a signal indicative of the analyte in a gas flow in the mainstream airway adapter. A processing portion receives the signal from the gas sensing portion and determines an amount of the analyte in the gas flow based on the signal from the gas sensing portion. The processing portion also compensates for volumetric differences between the gas flow during inspiration and the gas flow during expiration to maximize the accuracy in the measurements made using such a system and method.
13 Citations
13 Claims
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1. A mainstream gas monitoring system comprising:
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(a) a mainstream airway adapter; and (b) a gas sensing assembly associated with the mainstream airway adapter and comprising; (1) a gas sensing portion associated with the mainstream airway adapter, wherein the gas sensing portion outputs a signal indicative of an analyte in a gas flow in the mainstream airway adapter, and (2) a processing portion adapted to receive the signal from the gas sensing portion, wherein the processing portion is programmed to determine an amount of the analyte in the gas flow based on the signal from the gas sensing portion, and wherein the processing portion is programmed to compensate for volumetric differences between the gas flow during inspiration and the gas flow during expiration, wherein the processing portion compensates for the volumetric differences by monitoring a tracheal dead space gas and using the monitored tracheal dead space gas to determine the amount of the analyte in the gas flow, and wherein the monitored tracheal dead space gas comprises a first portion of gas exhaled during the expiration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification