Ventilation apparatus for cardiopulmonary resuscitation with display of the trend in CO2
Inventors
Richard, Jean-Christophe • RIGOLLOT, Marceau • Badat, Bilal
Assignees
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Publication Number
US-11389607-B2
Publication Date
2022-07-19
Expiration Date
Abstract
The invention relates to a respiratory assistance apparatus for delivering a respiratory gas, such as air, to a patient during cardiopulmonary resuscitation (CPR), having a source (1) of respiratory gas, means (4) for measuring the CO2 content, and signal-processing and control means (5). The signal-processing and control means (5) are configured to process the CO2 content measurement signals corresponding to measurements performed by the CO2 content measurement means (4) during a given period of time (dt), and to calculate at least one mean CO2 content value (Vmean) from the maximum CO2 content values (Vmax) obtained over the time window (Ft), and to transmit said at least one mean CO2 content value (Vmean) to the graphical user interface (7) which displays it.
Core Innovation
A respiratory assistance apparatus is described for delivering a respiratory gas to a patient during cardiopulmonary resuscitation (CPR). The apparatus includes a CO2 content measurement device for measuring a CO2 content produced by the patient and supplying CO2 content measurement signals to a signal-processing and control system. The signal-processing and control system processes the CO2 content measurement signals and provides information to at least one graphical user interface (GUI).
The signal-processing and control system processes the CO2 content measurement signals corresponding to measurements performed during a given time period (dt). From these measurements, it extracts a plurality of end tidal CO2 (EtCO2) content values and selects a maximum EtCO2 content value (Vmax) from the plurality measured during the given time period (dt). It then repeats the extracting and selecting to obtain several successive maximum EtCO2 content values (Vmax) measured over a time window (Ft) comprising several successive time periods (dt).
From only the several successive maximum EtCO2 content values (Vmax), the signal-processing and control system calculates at least one mean CO2 content value (Vmean) from within the time window (Ft). The at least one mean CO2 content value (Vmean) is transmitted to the GUI, and the GUI is configured to display the at least one mean CO2 content value (Vmean). The described concept is aimed at more reliable indication of alveolar CO2 and CPR effectiveness, including possible resumption of spontaneous cardiac activity (RSCA), and addresses that instantaneous etCO2 is unreliable at the chest-compression rate context described in the partial content.
Claims Coverage
The document contains one independent claim with a set of dependent refinements. The independent claim covers the core signal-processing/control method and its display/transmission in a respiratory assistance apparatus used during CPR, centered on extracting EtCO2 maxima over successive dt periods and calculating mean CO2 content values from those maxima over a time window (Ft).
Max EtCO2 extraction over a given time period and repetition over a time window
The signal-processing and control system is configured to process CO2 content measurement signals during a given time period (dt), extract therefrom a plurality of end tidal CO2 (EtCO2) content values, select a maximum EtCO2 content value (Vmax) from the plurality, and repeat the process to obtain several successive maximum EtCO2 content values (Vmax) measured over a time window (Ft) comprising several successive time periods (dt).
Mean CO2 content value computed from successive maxima only
The signal-processing and control system is configured to calculate at least one mean CO2 content value (Vmean) from only the several successive maximum EtCO2 content values (Vmax) obtained over the time window (Ft).
Transmit and display mean CO2 content values on a graphical user interface
The signal-processing and control system is configured to transmit the at least one mean CO2 content value (Vmean) to the at least one graphical user interface (7), and the graphical user interface (7) is configured to display the at least one mean CO2 content value (Vmean).
Overall, claim coverage focuses on processing patient-produced CO2 signals during CPR to derive Vmax from extracted EtCO2 values over repeated dt periods within Ft, computing Vmean from only those successive maxima, and displaying/transmitting the resulting mean CO2 content value(s) via a GUI.
Stated Advantages
More reliable indication of alveolar CO2 and CPR effectiveness/possible resumption of spontaneous cardiac activity (RSCA).
Addresses that instantaneous etCO2 at the described chest-compression rate context is unreliable.
Documented Applications
CPR respiratory assistance with a CO2 measurement and GUI indication for monitoring alveolar CO2, CPR effectiveness, and possible resumption of spontaneous cardiac activity (RSCA).
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