US 2013/0340756 A1 · METHOD AND APPARATUS TO ATTAIN AND MAINTAIN TARGET END TIDAL GAS CONCENTRATIONS

Abstract

In a first aspect, the invention relates to an apparatus for inducing or maintaining a target end tidal concentration of a gas in a subject comprising a breathing circuit, a source of gas flow into the circuit, means for controlling the rate of the source of gas flow into the circuit and means for controlling the concentration of gases in the source gas flow independently from each other. In another aspect, the invention relates to a method of preparing an apparatus for inducing or maintaining a target end tidal concentration of a gas X in a subject comprising selecting a rate of a source gas flow into a breathing circuit, selecting the concentration of at least one constituent gas of a component gas making up the source gas to a level corresponding to the end tidal concentration of the gas X, whereby the apparatus is adapted to administer a source gas having a first gas composition.

Claims24

Dependent claims

1-110. (canceled)

A method for inducing or maintaining a target end tidal concentration of at least one gas X in a subject comprising:

a) selecting a rate of a source gas flow into a re-breathing circuit used by the subject, the rate projected to be less than the minute ventilation of the subject such that the subject in-hales the source gas for the first portion of a breath and a neutral gas for a remainder of a breath;
b) selecting the concentration of at least one constituent gas X of at least one component gas making up the source gas, wherein the concentration of the constituent gas X in the source gas is computed from:
A) the target end tidal concentrations of gas X;
B) the flow rate of the source gas into the breathing circuit;
and
C) if X is a gas consumed by the patient gas, the minute consumption of gas X, or if gas X is produced by the patient, the minute production of gas X.
c) providing the source gas for inhalation by the subject for the first portion of a breath and providing a neutral gas for inhalation for the remainder of the breath.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/914,324Filed 10 Jun 2013

Priority

CA PCT/CA05/0116628 Jul 2005

Published

26 Dec 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification20 codes

A61M 16/12
Preparation of respiratory gases or vapours: by mixing different gases
A61B 5/055
Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves:…
A61M 16/0051
Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators ; Tracheal tubes: with alarm devices
A61M 16/024
Control means therefor: including calculation means, e.g. using a processor

Method and apparatus to attain and maintain target end tidal gas concentrations

Life of this patent

Method and apparatus to attain and maintain target end tidal gas concentrations

Life of this patent

Abstract

Claims24