Ambulatory Infusion Blockage Detection via Sliding Pressure Window
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Solution Overview
Problem
Conventional methods for detecting blockages in ambulatory infusion devices, such as changes in catheter pressure, are prone to inaccuracies due to environmental pressure changes, leading to false blockage determinations.
Innovation Solution
The implementation of a system that analyzes pressure measurements in conjunction with other factors like time, number of pump strokes, and volume of fluid transferred, using a sliding time window and threshold ranges to differentiate between blockages and environmental pressure changes, thereby reducing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-based methods are used to detect blockages, then blockage detection capability is provided, but measurement precision deteriorates due to false determinations from environmental pressure changes
Solution Approach 1:
The patent segments the pressure measurement analysis by dividing the time window into multiple periods and analyzing pressure changes within each period separately. This allows differentiation between gradual environmental pressure changes and sudden blockage-induced pressure increases, thereby improving measurement precision while maintaining reliable blockage detection.
Solution Approach 2:
The system dynamically adjusts the analysis by continuously monitoring pressure changes over time and comparing them against threshold ranges that account for environmental variations. The sliding time window approach allows the system to adapt to changing environmental conditions while maintaining accurate blockage detection, resolving the contradiction between reliability and measurement precision.
2Ease of operation
If pressure measurements are analyzed without contextual factors, then detection simplicity is maintained, but reliability deteriorates due to false blockage determinations
Solution Approach 1:
The patent makes the pressure measurement system multi-functional by incorporating multiple contextual factors (time, pump strokes, fluid volume) into a unified analysis framework. This universal approach allows the same system to distinguish between environmental pressure changes and actual blockages, improving reliability without significantly complicating the detection method.
Solution Approach 2:
The system uses feedback from multiple parameters (time, pump strokes, fluid volume) to continuously refine the blockage determination. By comparing pressure changes against contextual feedback data, the system achieves reliable blockage detection while maintaining operational simplicity through automated multi-parameter analysis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the likelihood of false blockage determinations, ensuring accurate detection of catheter blockages and minimizing unnecessary alarms while promptly alerting users to actual blockages.
Implementation Method 1
The pressure sensor is coupled to the catheter and configured to sense pressure associated with the catheter
Data Source
AI summary
Infusion devices with blockage detection capability and methods of monitoring infusion devices.