NPWT Leak Alarm Control for Variable Dressing Seal Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing negative pressure wound therapy (NPWT) devices generate frequent and unnecessary alarms due to fixed leak threshold values, which can be annoying and lead to user non-compliance.
Innovation Solution
A controller dynamically adjusts leak alarm parameters based on initial dressing application quality, power source capacity, and environmental factors to reduce unnecessary alarms and tailor alerts to the specific situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed leak threshold values are used in NPWT devices, then leak detection sensitivity is maintained, but alarm frequency increases causing user annoyance and non-compliance
Solution Approach 1:
The patent applies dynamics by transitioning from fixed leak threshold values to dynamically adjustable thresholds. The system automatically adapts the leak alarm parameters based on real-time monitoring of actual leak rates, power source capacity, and environmental factors. This allows the threshold to change over time rather than remaining static, resolving the contradiction between maintaining sensitivity and reducing false alarms that cause user non-compliance
Solution Approach 2:
The patent implements parameter changes by modifying the leak threshold value based on multiple factors including initial dressing application quality, power source capacity, and environmental conditions. The system adjusts the threshold parameter dynamically to optimize both detection sensitivity and user experience, preventing the contradiction between reliable leak detection and user annoyance from excessive alarms
2Reliability
If frequent leak alarms are generated, then leak detection reliability is improved, but user compliance deteriorates due to annoyance
Solution Approach 1:
The system changes the alarm frequency parameter dynamically based on the actual leak rate and power source capacity. When leak rates are low and within acceptable ranges, the system reduces alarm frequency or suppresses alarms entirely, preventing user annoyance while maintaining reliable detection capability. When actual leaks exceed thresholds, alarms are generated appropriately, ensuring detection reliability without causing excessive user irritation
3Ease of operation
If dynamic adjustment of leak thresholds is implemented, then false alarms are reduced, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing automatic adjustment of leak thresholds without requiring manual user input or complex configuration. The system monitors power source capacity, environmental factors, and actual leak rates, then autonomously adapts the alarm parameters. This self-adjusting capability reduces false alarms while avoiding the complexity of manual setup and ongoing user configuration
Solution Approach 2:
The system implements feedback loops where alarm parameters are continuously adjusted based on monitored performance and environmental conditions. The controller receives feedback from power source status, environmental sensors, and leak rate measurements, then automatically modifies threshold values to optimize performance. This feedback mechanism achieves false alarm reduction through systematic adaptation rather than complex manual control algorithms
4Measurement precision
If leak alarm parameters are adjusted based on multiple factors, then alarm accuracy is improved, but processing requirements and energy consumption increase
Solution Approach 1:
The patent applies partial action by selectively adjusting alarm parameters based on the most critical factors rather than continuously processing all possible inputs. The system prioritizes adjustments based on power source capacity, initial dressing quality, and significant environmental changes, avoiding unnecessary processing of minor variations. This approach maintains high alarm accuracy while limiting energy consumption to essential computations only
Data Source
Figure 1
Figure 2
Figure 3
AI summary
One implementation of the present disclosure is a method for dynamically controlling an alarm of a negative pressure wound therapy (NPWT) device, according to some embodiments. In some embodiments, the method includes initiating NPWT, comparing an initial pump duty to a threshold value to determine a dressing application quality, monitoring a leakage rate of the NPWT, setting a leak threshold value based on the dressing application quality, determining leakage event occurrences in response to the leakage rate exceeding the leak threshold value at multiple times, adjusting the leak threshold value based on at least one of a number of the leakage events over the time period, a time duration between sequentially occurring leakage events of the leakage events, and the dressing application quality, and causing a user interface device to display a leak alert in response to the leakage rate exceeding the adjusted leak threshold value.