Cough Synchronization in Mechanical Insufflation-Exsufflation
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Solution Overview
Problem
Current mechanical insufflation-exsufflation devices lack an effective method to synchronize patient-initiated coughs with the transition from the insufflation phase to the exsufflation phase, relying on verbal instructions that are often ineffective due to the patient's slow or varying reflex, leading to poor synchronicity and reduced therapy efficacy.
Innovation Solution
A system and method that dynamically synchronize the patient's cough with the transition from the insufflation phase to the exsufflation phase by monitoring cough effort through sensors and processors, automatically switching the device once a cough is detected, using a pressure generator and subject interface to deliver pressurized gas and control the airflow for improved synchronicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If verbal instructions are used to synchronize patient cough with exsufflation phase, then device operation is simple, but synchronization precision deteriorates due to slow and varying patient reflex
Solution Approach 1:
The patent replaces the mechanical/manual method of verbal instruction with an automated sensor-based detection system. Sensors monitor respiratory parameters (flow rate, pressure) to automatically detect cough initiation, eliminating the need for verbal cues and achieving precise synchronization without manual intervention.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring respiratory parameters through sensors during the insufflation phase. When cough effort is detected via changes in flow rate or pressure, the system automatically triggers the exsufflation phase, creating a closed-loop control system that adapts to patient-specific cough timing.
2Measurement precision
If automated sensor-based cough detection is implemented, then cough synchronization precision is improved, but device complexity increases
Solution Approach 1:
The patent utilizes existing respiratory monitoring sensors (flow rate and pressure sensors) that are already part of standard mechanical insufflation-exsufflation devices. By repurposing these existing sensors for cough detection, the system achieves automated synchronization without adding significant new hardware complexity.
Solution Approach 2:
The system enables the patient's own respiratory physiology to trigger the therapy automatically. The sensors detect natural changes in respiratory parameters during cough effort, allowing the system to self-regulate timing without external control or complex programming, simplifying the overall control architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances patient comfort and therapy effectiveness by ensuring precise synchronization of cough efforts with the exsufflation phase, improving the overall efficacy of mechanical insufflation-exsufflation therapy.
Implementation Method 1
a pressure generator configured to generate a pressurized flow of breathable gas for delivery to an airway of a subject
Implementation Method 2
one or more sensors operatively coupled to the subject interface and configured to generate one or more output signals related to one or more parameters associated with the gas in the subject interface
Implementation Method 3
one or more parameters associated with the gas in the subject interface with the one or more sensors; receiving the output signals with the one or more processors
Data Source
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AI summary
The present disclosure pertains to a method and system configured for cough synchronization in a mechanical insufflation-exsufflation system. The system is configured to synchronize (712) the transition from an insufflation mode to an exsufflation mode to a patient initiated cough by detecting cough effort of the patient e.g. at the end of the insufflation phase. The detection of cough effort of the patient is based on one or more parameters associated with gas in the system. Upon detecting that the patient is initiating a cough, the system automatically switches the insufflation mode to the exsufflation mode to assist the patient to generate an effective cough.