NPWT Control Algorithm for Leak Detection and Battery Conservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Negative pressure wound therapy (NPWT) devices face challenges in identifying leaks and optimizing battery usage, leading to inefficient operation and premature battery depletion due to persistent dressing leaks.
Innovation Solution
The NPWT device incorporates a control algorithm that switches between standard therapy, seal assist, pressure optimization, and preservation modes based on leak detection and battery status, adjusting setpoint pressure to maintain therapy while conserving energy and reducing alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump operates at a high setpoint vacuum pressure to maintain effective wound therapy, then the therapy effectiveness is improved, but the battery is depleted more quickly due to higher energy consumption
Solution Approach 1:
The system dynamically adjusts the pump setpoint pressure based on real-time leak detection. When a leak is detected, the controller reduces the setpoint pressure to conserve battery energy while maintaining adequate therapy effectiveness. This dynamic adaptation allows the system to optimize the trade-off between therapy reliability and energy consumption throughout the treatment period.
Solution Approach 2:
The controller changes the operating parameter (setpoint pressure) in response to detected conditions. By monitoring actual vacuum pressure and comparing it to expected values, the system identifies leaks and adjusts the setpoint pressure parameter accordingly, thereby reducing battery consumption while maintaining acceptable therapy levels.
2Reliability
If the pump operates continuously at full pressure to compensate for leaks, then the leak is compensated, but the battery life is reduced due to uninterrupted high energy consumption
Solution Approach 1:
Instead of continuous full-pressure operation, the system employs periodic leak detection and responsive pressure adjustment. The controller periodically monitors actual vacuum pressure, detects leaks when deviations occur, and temporarily adjusts setpoint pressure to compensate. This periodic approach maintains adequate pressure management while significantly reducing overall battery consumption compared to continuous full-pressure operation.
3Loss of information
If the device provides frequent leak alerts to keep the user informed, then the user awareness of leaks is improved, but the user experience deteriorates due to alarm fatigue
Solution Approach 1:
The system implements intelligent feedback mechanisms that provide leak information selectively. Rather than alerting users to every minor pressure variation, the controller analyzes patterns and provides feedback only when sustained leaks are detected that would meaningfully impact therapy effectiveness. This selective feedback maintains user awareness of significant issues while avoiding alarm fatigue from trivial notifications.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
One implementation of the present disclosure is a negative pressure wound therapy (NPWT) device. The NPWT device is configured to perform NPWT and includes a battery configured to supply the NPWT device with power, a pump configured to receive power from the battery and to produce a vacuum at a setpoint pressure to perform the NPWT, a user interface configured to provide alerts to a user, and a controller configured to receive power from the battery and to adjust the setpoint pressure of the pump. The controller is configured to operate the NPWT device in a standard therapy mode, a seal assist therapy mode, a pressure optimization mode, and a preservation mode of operation.