Gravity IV Flow Sensing via Mass Change and Drop Counting
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Solution Overview
Problem
Gravity-based infusion systems require caregiver intervention for setup, maintenance, and monitoring, which can lead to potential complications and errors in medical fluid administration, posing risks to patients and increasing the complexity and cost of care.
Innovation Solution
A gravity infusion control system that includes a drip chamber with a mass change sensor and a drop detector, allowing for precise control and monitoring of fluid flow rates and volumes, with features such as automatic start/stop functionality and detection of complications like occlusions and air in the fluid pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pump-based infusion systems are used, then flow rate control and volume monitoring are improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical pump system with a gravity-based system enhanced by electronic sensors and control. Instead of using a mechanical pump to control fluid flow, the system uses a mass change sensor to detect fluid weight changes and a drop counter to track individual drops, combining these signals to precisely control flow rate through electronic means rather than mechanical pumping action.
Solution Approach 2:
The gravity-based system utilizes the natural force of gravity to drive fluid flow from the reservoir through the tubing to the patient. The system automatically maintains flow rate control through sensor feedback without requiring an external mechanical pump, allowing the gravity force itself to perform the fluid delivery function while electronic components only monitor and regulate.
2Device complexity
If gravity-based infusion systems are used, then device complexity and cost are reduced, but measurement precision of flow rate decreases
Solution Approach 1:
The patent replaces manual mechanical flow control methods with electronic sensing and control. Instead of relying on visual estimation or manual adjustment of gravity flow, the system uses a mass change sensor to precisely measure fluid weight changes and a drop counter to accurately track individual drops, combining these signals to achieve precise electronic control of flow rate.
Solution Approach 2:
The system incorporates feedback control through the mass change sensor that continuously monitors the weight of the fluid reservoir and provides real-time information about fluid flow. This feedback signal is combined with drop counter information to automatically adjust and maintain the desired flow rate, enabling precise control despite using simple gravity-based mechanics.
3Device complexity
If caregiver manually monitors and adjusts flow parameters, then device complexity is reduced, but reliability of fluid administration decreases
Solution Approach 1:
The system enables self-monitoring and self-regulation through automated sensors and control mechanisms. The mass change sensor automatically detects fluid weight changes, the drop counter automatically tracks individual drops, and the control system automatically maintains flow rate without requiring continuous caregiver intervention, thereby improving reliability while keeping the device relatively simple.
Solution Approach 2:
The system implements continuous feedback control where the mass change sensor and drop counter continuously monitor fluid administration parameters and provide real-time information to the control system. This feedback mechanism automatically adjusts flow rate and provides alerts for complications, ensuring reliable fluid administration without requiring constant manual monitoring and adjustment by caregivers.
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
The system enhances patient safety by reducing the risk of errors and complications, improves workflow efficiency for caregivers, and provides accurate and stable medication delivery, while also lowering costs and improving documentation efficiency.
Implementation Method 1
a mass change sensor configured to detect any of a change in weight or movement of the infusate in the drip chamber
Implementation Method 2
a drop detector configured to detect drops of the infusate falling from the drip chamber
Implementation Method 3
an infusate fluid flow is directed through the IV tubing by a pressure of gravity
Data Source
AI summary
Infusion control systems are disclosed that can control and monitor medical fluid administration for gravity-based infusion of medical fluid, where the gravity infusion control system is couplable with an intravenous administration set and can include a mass change sensor and drop counter.