Pressure-Actuated IV Flow Control for Secondary Line Backflow
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Solution Overview
Problem
Infusion IV sets with secondary lines often experience under-infusion and backflow due to check valve failures, primarily caused by debris and air entering the secondary line, leading to inefficient medication delivery and potential patient harm.
Innovation Solution
A flow control device with a housing having primary and secondary inlets and an outlet, featuring a valve member that pivots based on fluid pressure differences to prevent backflow and ensure proper fluid direction, eliminating the need for separate check valves and reducing the risk of air embolisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is positioned in the primary line to prevent backflow, then backflow prevention is improved, but the device complexity increases and reliability decreases due to frequent failure from debris and air
Solution Approach 1:
The patent combines the backflow prevention function and the flow control function into a single integrated valve mechanism. The valve member is positioned to block both the primary inlet and control the outlet flow simultaneously, eliminating the need for separate check valves and reducing component count while maintaining reliability
Solution Approach 2:
The patent removes the separate check valve component from the system entirely. Instead of adding a check valve to prevent backflow, the design extracts this function by using the outlet valve member's positioning and actuation mechanism to inherently prevent secondary line fluid from flowing backward into the primary line
2Reliability
If a check valve is used to prevent backflow, then backflow prevention is improved, but loss of time occurs due to frequent valve failures requiring intervention
Solution Approach 1:
The valve system operates autonomously using fluid pressure differentials to actuate the valve member. When secondary line fluid pressure exceeds primary line pressure, the valve automatically closes to prevent backflow, and when primary line pressure is higher, the valve automatically opens to allow flow, eliminating the need for manual intervention or complex control systems
Solution Approach 2:
The system incorporates inherent feedback through pressure-sensing ports that detect the relative pressure between primary and secondary lines. This feedback mechanism automatically actuates the valve based on real-time pressure conditions, ensuring reliable backflow prevention without requiring external monitoring or adjustment
3Reliability
If check valves are used in the IV line, then backflow prevention is improved, but object-generated harmful factors increase due to air embolisms and under-infusion
Solution Approach 1:
The patent converts the potential harmful effect of air and debris in the secondary line into a beneficial control mechanism. By using the presence of air/debris in the secondary line as the triggering condition that closes the valve, the system prevents these same contaminants from causing harm by blocking their path into the primary line and patient circulation
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 device effectively prevents backflow and under-infusion by utilizing fluid pressure to direct medication flow, ensuring timely and accurate delivery of medications without the need for manual priming or additional components, thereby enhancing patient safety and reducing IV set costs.
Implementation Method 1
a valve member (120) mounted in the chamber to pivot toward and block the primary inlet by fluid pressure in the secondary inlet when fluid pressure into the secondary inlet is higher than fluid pressure into the primary inlet
Data Source
AI summary
A flow control device includes a housing having a primary inlet, a secondary inlet, and an outlet disposed downstream of the primary and secondary inlets. The flow control device further includes a chamber defined by an inner circumferential surface of the housing. The chamber fluidly connects the primary and secondary inlets with the outlet. A valve member is mounted in the chamber to pivot toward and block the primary inlet by fluid pressure in the secondary inlet when fluid pressure into the secondary inlet is higher than fluid pressure into the primary inlet.