Dynamic Alarm Delay Control for Medical Patient Monitoring
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Solution Overview
Problem
Existing patient monitoring systems generate nuisance alarms due to the inability to differentiate between improving and deteriorating patient conditions, leading to unnecessary alerts that distract clinical staff from more critical alarms.
Innovation Solution
A method for controlling alarms in medical instruments that dynamically adjusts the alarm delay based on the rate of change of physiological parameters, providing shorter delays for increasing deviations and longer delays for decreasing deviations, ensuring that improving conditions do not trigger alarms prematurely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed alarm delay is used to avoid nuisance alarms, then the number of nuisance alarms is reduced, but the warning time for critical patient conditions is delayed
Solution Approach 1:
The alarm delay is transformed from a fixed value to a dynamic value that automatically adjusts based on the patient's condition. The system calculates the alarm delay as a function of the current physiological parameter value and the rate of change, allowing the delay to be longer for stable conditions and shorter for rapidly deteriorating conditions, thus resolving the contradiction between avoiding nuisance alarms and providing timely warnings.
Solution Approach 2:
The system changes the parameter of alarm delay based on the physiological parameter readings. By monitoring the rate of change of physiological parameters and the current value relative to alarm thresholds, the system dynamically adjusts the alarm delay parameter to optimize both false alarm reduction and critical event detection.
2Object-generated harmful factors
If the alarm delay is extended to filter out transient abnormalities, then nuisance alarms are reduced, but critical alarms are delayed
Solution Approach 1:
The alarm delay parameter is dynamically adjusted based on the rate of change of the physiological parameter. When the rate of change indicates a rapidly deteriorating condition, the alarm delay is reduced to ensure fast response. When the condition is stable or improving, the delay is extended to filter transient abnormalities, thus resolving the contradiction between response speed and nuisance alarm reduction.
3Device complexity
If a simple threshold-based alarm system is used, then the system complexity is low, but nuisance alarms increase
Solution Approach 1:
The system uses multiple parameters (current physiological value, rate of change, and alarm threshold) to dynamically determine the alarm delay, moving beyond simple threshold comparison. This multi-parameter approach significantly reduces nuisance alarms while maintaining manageable system complexity through standardized calculation methods.
Solution Approach 2:
The system incorporates feedback by continuously monitoring the physiological parameter and its rate of change, then using this information to adjust the alarm delay. This feedback mechanism allows the system to adapt to patient condition changes and distinguish between transient fluctuations and true alarm conditions, improving alarm accuracy without excessive complexity.
Data Source
AI summary
The invention concerns a method for controlling an alarm in a medical instrument or system, the medical instrument or system detecting at least one physiological parameter of the patient. The present value of the physiological parameter is consecutively detected and an alarm delay is determined as a function of at least one detected value of the physiological parameter wherein the function yields a shorter alarm delay for increasing values of the deviation from a normal value and a longer alarm delay for decreasing values of the deviation from the normal value. Further, the duration the value of the physiological parameter exceeds or under-runs at least one predefined threshold for the physiological parameter defining an upper or lower limit for a normal range of the physiological parameter, respectively, is measured and the alarm is generated when the duration the determined value of the physiological parameter exceeds or under-runs the predefined threshold exceeds the alarm delay. This method allows for the avoidance of nuisance alarms while still indicating severe conditions of the monitored patient reliably.