Respiratory Pressure Limit Circuit for Over-Pressure Detection
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Solution Overview
Problem
Respiratory treatment devices face challenges in effectively controlling pressure to prevent over-pressure conditions, which can occur due to system faults or other factors, potentially leading to adverse patient outcomes.
Innovation Solution
A pressure limit circuit is implemented to detect and prevent over-pressure conditions by setting multiple pressure thresholds that can dynamically change based on detected pressure characteristics, triggering a reduction in pressure through motor braking and optionally generating an alarm, ensuring the delivered pressure does not exceed safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure threshold is used to control over-pressure conditions, then the control system is simple, but it cannot effectively distinguish between transient pressure spikes and sustained over-pressure conditions
Solution Approach 1:
The patent applies dynamics by implementing multiple pressure thresholds (first threshold P1 and second threshold P2) that dynamically change based on the duration of the over-pressure condition. The control system transitions between different threshold levels depending on whether the condition is transient or sustained, improving detection accuracy without requiring overly complex additional hardware
Solution Approach 2:
The control system performs preliminary action by setting a first pressure threshold P1 for immediate response to over-pressure conditions, and a second lower threshold P2 for sustained conditions. This preliminary multi-threshold setup allows the system to prepare different control actions in advance based on the nature of the pressure deviation
2Reliability
If pressure is reduced immediately when threshold is exceeded, then patient safety is improved, but normal transient pressure variations cause unnecessary pressure interruptions
Solution Approach 1:
The control system dynamically adjusts the pressure reduction action based on the duration of the over-pressure condition. For transient conditions (below time threshold T), the system maintains normal operation. For sustained conditions (above T), the system activates pressure reduction, thus adapting the safety response to the actual risk level
Solution Approach 2:
The system implements periodic monitoring of pressure conditions with a time threshold T, comparing the duration of over-pressure events against this periodic reference. This allows differentiation between brief normal variations and sustained dangerous conditions, maintaining treatment continuity when appropriate
3Productivity
If multiple pressure thresholds and time delays are implemented, then transient pressure spikes are avoided, but the response time to prevent dangerous over-pressure conditions increases
Solution Approach 1:
The control system dynamically selects between fast response (using P1 threshold) and delayed response (using P2 threshold with time delay T) based on the characteristics of the detected pressure condition. This dynamic selection optimizes both response speed and stability according to the specific situation
Data Source
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AI summary
A pressure-limit control device to prevent an over-pressure condition of a respiratory treatment apparatus, the device comprising a first circuit configured to detect a signal representative of a measure of pressure exceeding a first threshold, the first threshold representative of a first pressure limit, and to detect the exceeding of the first threshold by a second threshold, the second threshold representing a first time limit; and a second circuit configured to detect the signal representative of a measure of pressure exceeding a third threshold, the third threshold representative of a second pressure limit, and to detect the exceeding of the third threshold by a fourth threshold, the fourth threshold representing a second time limit; wherein the first and second pressure limits are different pressure limits and the first and second time limits are different time limits, and wherein a detection by either one of the first circuit and second circuit indicates an over-pressure condition of the respiratory treatment apparatus.