Monitoring or ventilation apparatus for cardiopulmonary resuscitation with determination of an airway opening index

Inventors

Richard, Jean-Christophe • RIGOLLOT, Marceau • Badat, Bilal

Assignees

Air Liquide Medical Systems SA

Abstract

The invention relates to a monitoring and/or respiratory assistance apparatus that can be used during a cardiopulmonary resuscitation (CPR) with successive chest compressions of duration (dt) performed on the patient and with relaxations, said apparatus comprising a CO2 content measurement sensor (10) a graphical user interface (14), and signal-processing system (11) configured to process the CO2 content measurement signals in such a way as to determine at least one maximum CO2 content value (Vmax) and at least one minimum CO2 content value (Vmin), during at least one duration (dt) of at least one chest contraction, and then to calculate at least one airway opening index AOI or mean index AOImean on the basis of the CO2 content values. Said one or more indices are displayed on the GUI in the form of numerical values or graphical representations, especially curves or pictograms.

Core Innovation

The invention relates to a monitoring and/or respiratory assistance apparatus usable during cardiopulmonary resuscitation (CPR) with successive chest compressions and relaxations. A CO2 content measurement sensor measures a concentration of CO2 produced by a patient during CPR and supplies a CO2 content measurement signal to a signal-processing system. The signal-processing system determines at least one maximum CO2 content value (Vmax) and at least one minimum CO2 content value (Vmin) during at least one duration (dt) of at least one chest compression (CC).

Based on Vmax and Vmin, the signal-processing system calculates an airway opening index (AOI) such that AOI=(Vmax−Vmin)/Vmax. Alternatively, the system calculates a mean index AOImean on the basis of several successive opening indices AOI obtained during the durations (dt) of n successive chest compressions, with n>1. The apparatus therefore derives an index characterizing changes in CO2 content during individual compressions and also provides a mean index over several compressions.

The signal-processing system transmits at least one index value AOI or at least one mean index value AOImean to at least one graphical user interface (GUI). The GUI is configured to display said index value or mean index value, and/or a graphical representation of said index value or mean index value. The described graphical representations include numeric display and graphical representations such as a curve or a lungs pictogram, together with threshold alarm functionality.

Claims Coverage

The independent claim is directed to an apparatus for CPR monitoring/respiratory assistance that measures CO2, computes an airway opening index from per-compression Vmax/Vmin values or a mean over successive compressions, and displays the index on a GUI. The claim set also includes refinement of GUI representation formats, quantitative alarm behavior, and an assisted ventilation configuration.

Across the claim set, the core inventive processing is the determination of Vmax and Vmin during chest compression durations (dt) and calculation of an airway opening index AOI=(Vmax−Vmin)/Vmax, with an alternative mean index AOImean computed from n>1 successive compressions. The resulting AOI or AOImean is transmitted to a GUI for display, optionally including specific graphical representations and a threshold alarm when AOI or AOImean falls below 0.75, and the apparatus can be part of an assisted ventilation system with a respiratory gas source and micro-blower.

Stated Advantages

Documented Applications