Pressure Support Triggering for Accurate Inspiration Detection
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Solution Overview
Problem
Existing pressure support devices struggle to synchronize gas delivery with a patient's breathing cycles accurately, particularly during inspiration phases, leading to inefficient and noisy pressure control due to noise and artifacts in patient pressure signals.
Innovation Solution
A system and method that uses a patient pressure sensor to generate pressure triggers based on smoothed derivative signals, applying slope limits and minimum inhalation durations to accurately identify inspiration phases, ensuring timely and synchronized pressure level adjustments in gas delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pressure triggers are generated based on raw patient pressure signals, then the system responds quickly to inspiration phases, but the pressure control becomes noisy and inaccurate due to signal artifacts
Solution Approach 1:
The system applies smoothing filters to the patient pressure signal before generating pressure triggers. This preliminary processing removes noise and artifacts from the signal, ensuring that triggers are generated only from genuine inspiration phases rather than signal artifacts, thereby improving measurement precision while maintaining response speed
Solution Approach 2:
The patent introduces an intermediary processing stage between the raw pressure signal and trigger generation. This intermediary layer applies smoothing algorithms and derivative calculations to transform the noisy pressure signal into a clean trigger signal, resolving the contradiction between quick response and accurate measurement
2Measurement precision
If the system applies extensive signal smoothing and processing, then pressure control accuracy improves, but the response time to inspiration phases increases
Solution Approach 1:
The system applies smoothing filters with carefully selected parameters that provide sufficient noise reduction without excessive processing. The smoothing degree is optimized to remove artifacts while preserving the timing characteristics of genuine inspiration phases, achieving partial smoothing that balances accuracy and response time
Solution Approach 2:
The patent adjusts the parameters of the smoothing filter (such as time constant or window size) to optimize the balance between noise reduction and response speed. By changing these parameters, the system achieves accurate trigger detection without excessive delay
3Reliability
If the ventilation system adjusts pressure levels frequently to match breathing cycles, then respiratory support synchronization improves, but the system complexity increases
Solution Approach 1:
The system uses the patient's own pressure signal to automatically generate triggers for pressure adjustments. This self-service approach eliminates the need for complex external sensing and control algorithms, achieving reliable breathing synchronization through a relatively simple control mechanism that responds naturally to patient physiology
Data Source
AI summary
The present disclosure relates to systems and method of controlling the pressure level of a gas mixture being delivered to a patient via a pressure support device adapted to provide breathing support to a patient that varies with time. More specifically, the systems and methods described herein enable the accurate detection of active inspiration by the patient and the fast triggering of an increased inspiratory positive airway pressure pulse. Further, the systems and methods described rely upon the patient pressure measured along a turbulent gas flow path and finds particular application when the pressure support device is configured to provide a non-zero positive end-expiratory pressure.