Infusion Bubble Detection with Volume Thresholds
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Solution Overview
Problem
Conventional infusion devices struggle to accurately differentiate between harmful air bubbles and micro-bubbles that cling to the inside of tubing, leading to improper alarm triggers during fluid infusion in medical settings.
Innovation Solution
An infusion device with multiple modules and bubble sensors that detect bubbles based on volume thresholds and time, generating specific alarms for single bubbles, accumulated bubbles, and total bubble volume, along with a processor to control the pump and display alarms, ensuring accurate detection and prevention of harmful air bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bubble sensors are used to detect all bubbles during fluid infusion, then patient safety is improved by detecting air bubbles, but false alarms are generated by micro-bubbles that are not harmful
Solution Approach 1:
The system changes the parameter of bubble volume measurement by implementing multiple volume thresholds (first threshold for single large bubbles, second threshold for cumulative small bubbles). This allows the sensor to differentiate between harmful air bubbles requiring immediate alarm and harmless micro-bubbles that can be tolerated, thereby reducing false alarms while maintaining patient safety
Solution Approach 2:
The alarm system dynamically adjusts its response based on bubble characteristics. Instead of a static alarm threshold, the system evaluates bubble volume against multiple thresholds and determines alarm generation dynamically - generating an alarm for single bubbles exceeding the first threshold, for cumulative bubbles exceeding the second threshold, or for both conditions simultaneously depending on the specific detection scenario
2Measurement precision
If multiple alarm conditions are implemented to differentiate bubble types, then detection precision is improved, but device complexity increases
Solution Approach 1:
The alarm function is segmented into distinct modules: a first alarm generation module for single large bubbles exceeding the first threshold, and a second alarm generation module for cumulative small bubbles exceeding the second threshold. This segmentation allows each module to handle specific detection scenarios independently, improving measurement precision while organizing device complexity into manageable, functionally distinct components
Solution Approach 2:
The bubble sensor system performs multiple functions through a unified detection mechanism. The same sensor detects all bubbles, but the system universally applies different evaluation criteria (first threshold for single bubbles, second threshold for cumulative bubbles) to different detection scenarios, allowing one detection system to serve multiple alarm generation purposes without requiring separate physical sensors for each function
Data Source
AI summary
Systems and methods for sensing bubbles during fluid infusion are disclosed. An infusion device comprises a pathway, a pump adjacent the pathway, one or more bubble sensors, and first and second modules. The pump alters the pathway to pump fluid through tubing received in the pathway. The bubble sensors are configured to detect bubbles in the fluid being pumped through the tubing. The first module is configured to generate a first alarm condition when the bubble sensors detect a bubble having a first volume above a first preselected threshold. The second module is configured to generate a second alarm condition when the bubble sensors detect a plurality of bubbles over a preselected period of time having a combined volume above a second preselected threshold. A third module may be also be used to record a total combined volume of bubbles detected by the bubble sensors during an infusion event.