Infusion Pump Fluid Level Detection via Pressure Sensing
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Solution Overview
Problem
Intravenous fluid infusion pumps face challenges in accurately detecting when a fluid supply container is empty, leading to potential air introduction and wastage of drugs due to inconsistencies in supplied fluid volume, which can result in safety issues and inefficiencies.
Innovation Solution
A medical fluid infusion system with a device and method that includes a fluid lumen with varying cross-sectional area and a pressure sensor to measure static fluid pressure, generating a signal when the fluid level reaches a predetermined state, indicating when the container is exhausted or near exhausted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the infusion pump relies on manual indication of fluid volume, then the device complexity is reduced, but the measurement precision of fluid level detection deteriorates
Solution Approach 1:
The patent replaces manual indication (mechanical/human operation) with an automated pressure sensing system. The pressure sensor detects fluid level changes through pressure variations in the fluid pathway, converting a manual detection task into an automated electronic measurement system that provides precise fluid level detection without requiring complex mechanical level sensors in the container.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to indirectly measure fluid level. Instead of directly measuring fluid height or volume, the system uses pressure sensor readings from the fluid pathway as a mediator to infer the fluid level state, enabling accurate detection without direct contact with the fluid container.
2Device complexity
If the pump system lacks accurate empty bag detection, then the device complexity is reduced, but the reliability of fluid delivery deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the pressure sensor continuously monitors fluid level conditions and provides information back to the control system. When the fluid level reaches a critical threshold (empty bag condition), the system receives feedback signals and can respond by alerting the user or stopping infusion, ensuring reliable fluid delivery without requiring complex redundant safety systems.
Solution Approach 2:
The patent replaces complex mechanical empty-bag detection mechanisms with a simplified electronic pressure sensing approach. The pressure sensor system provides reliable detection of fluid exhaustion through electronic means, improving reliability while keeping the overall device complexity low compared to mechanical level sensors or complex flow measurement systems.
3Adaptability or versatility
If the fluid supply volume varies from stated volume, then the adaptability of the system is improved, but the measurement precision of fluid quantity deteriorates
Solution Approach 1:
The patent replaces reliance on stated container volumes with actual pressure-based measurement. The pressure sensor system directly measures the physical state of the fluid in the pathway, providing accurate quantity information regardless of variations in container labeling or filling accuracy, thus maintaining measurement precision while adapting to different fluid supply conditions.
Solution Approach 2:
The patent changes the measurement parameter from stated volume (a nominal parameter) to actual pressure (a physical parameter). By monitoring pressure variations in the fluid pathway, the system directly measures the actual fluid quantity and level, adapting to variations in supplied fluid volume while maintaining precise measurement of the actual amount present.
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
Effectively prevents premature exhaustion of fluid and reduces drug wastage by accurately detecting the empty state of the fluid supply container, ensuring continuous and safe infusion.
Implementation Method 1
a pressure sensor in fluid communication with the fluid lumen so as to measure static fluid pressure in the fluid lumen, the static fluid pressure being based on a column height of fluid in the fluid lumen
Data Source
AI summary
A medical fluid infusion system includes a pump system configured to deliver a fluid drug to a patient. The system includes a device and method for detecting when the level of a fluid in a fluid supply container (such as an IV bag) is exhausted or near exhausted.