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US 2014/0194767 A1Published application
Non-invasive ventilation measurement
AssigneeKoninklijke Philips N.V.
InventorsHan Zheng, Samir Ahmad, Masahiro Taniguchi
Life of this patent
Estimating the term…
Abstract
Determining the lung compliance and lung resistance of a subject undergoing respiratory therapy using non-invasive ventilation requires taking the presence of leaks into account. In particular, variable and unintentional leaks at or near a subject interface appliance may be dynamically determined based on an average resistance of the leak orifice of the subject.
Claims21
A system configured to measure respiratory parameters during application of non-invasive respiratory therapy of a subject, the system comprising:
- one or more processors configured to execute computer program modules, wherein the computer program modules comprise:
- a timing module configured to determine transitions in breathing between inhalations and exhalations;
- a passive compliance module configured to determine a passive exhalation lung compliance during an exhalation, wherein the determination by the passive compliance module is based on a passive lung model, and wherein the exhalation is demarcated based on the transitions;
- a passive resistance module configured to determine a passive exhalation lung resistance during the exhalation, wherein the determination by the passive resistance module is based on the passive lung model;
- an active compliance module configured to determine an active lung compliance that reflects an active lung model, wherein the active lung compliance is determined based on the passive exhalation lung compliance and a subject breathing mode;
- an active resistance module configured to determine an active lung resistance that reflects the active lung model, wherein the active lung resistance is determined based on the passive exhalation lung resistance and the subject breathing mode;
- and
- a flow module configured to determine an instantaneous estimated subject flow, wherein the flow module takes a presence of both (i) instantaneous known respiratory circuit leaks and (ii) instantaneous unknown respiratory circuit leaks into account to determine the instantaneous estimated subject flow.
5 more elements
A method for measuring respiratory parameters during non-invasive respiratory therapy of a subject, the method comprising:
- determining transitions in breathing between inhalations and exhalations;
- determining a passive exhalation lung compliance, during an exhalation, based on a passive lung model, wherein the exhalation is demarcated based on the transitions;
- determining a passive exhalation lung resistance, during the exhalation, based on the passive lung model;
- obtaining a subject breathing mode;
- determining an active lung compliance that reflects an active lung model, wherein the determination is based on the passive exhalation lung compliance and the subject breathing mode;
- determining an active lung resistance that reflects the active lung model, wherein the determination is based on the passive exhalation lung resistance and the subject breathing mode;
- and
- determining an instantaneous estimated subject flow, wherein determining the instantaneous estimated subject flow takes a presence of both (i) instantaneous known respiratory circuit leaks and (ii) instantaneous unknown respiratory circuit leaks into account to determine the instantaneous estimated subject flow.
5 more elements
A system configured for measuring respiratory parameters during application of non-invasive respiratory therapy of a subject, the system comprising:
- means for determining transitions in breathing between inhalations and exhalations;
- means for determining a passive exhalation lung compliance, during an exhalation, based on a passive lung model, wherein the exhalation is demarcated based on the transitions;
- means for determining a passive exhalation lung resistance, during the exhalation, based on the passive lung model;
- means for obtaining a subject breathing mode;
- means for determining an active lung compliance, reflecting an active lung model, based on the passive exhalation lung compliance and the subject breathing mode;
- means for determining an active lung resistance, reflecting the active lung model, based on the passive exhalation lung resistance and the subject breathing mode;
- and
- means for determining an instantaneous estimated subject flow, wherein determining the instantaneous estimated subject flow takes a presence of both (i) instantaneous known respiratory circuit leaks and (ii) instantaneous unknown respiratory circuit leaks into account to determine the instantaneous estimated subject flow.
5 more elements
(canceled)
Dependencies are inferred from the claim text.