Floater Valve Flow Control for Gravity IV Backflow Prevention
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Solution Overview
Problem
IV sets with secondary lines often experience under-infusion and backflow of drugs due to check valve failures, primarily caused by debris and air entry, leading to improper drug delivery and potential air embolisms.
Innovation Solution
A flow control device with a floating valve member that selectively permits fluid flow from the primary inlet into the chamber when the fluid level is below a predetermined level and prevents backflow by sealing when the fluid level exceeds this level, using a buoyant force to displace the valve and block reverse flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a check valve is used to control fluid flow, then flow direction control is improved, but under-infusion occurs due to air entering the secondary line
Solution Approach 1:
The floating ball mechanism is inherently dynamic, automatically adjusting its position based on real-time fluid conditions. When air enters the secondary line or pressure changes occur, the ball rolls to the appropriate position to maintain proper flow direction and prevent under-infusion, providing dynamic adaptation without complex control systems.
2Ease of operation
If a traditional check valve structure is used, then flow control function is improved, but device complexity increases due to additional components
Solution Approach 1:
The invention extracts only the essential flow control function from the complex check valve structure, implementing it through a simple floating ball that uses the fluid environment itself rather than mechanical components. This reduces device complexity while maintaining flow control functionality.
Solution Approach 2:
The floating ball is self-actuating, using the buoyant force and pressure differentials of the fluid itself to control flow direction. No external actuators, springs, or complex mechanical linkages are needed—the ball serves itself by responding naturally to the fluid conditions it monitors.
3Device complexity
If the valve member is disposed entirely in the chamber, then flow control is simplified, but the valve cannot effectively prevent backflow from secondary line
Solution Approach 1:
The valve member is positioned at the interface between the chamber and the primary line, utilizing the third dimension of space to span across the fluid boundary. This strategic positioning allows the ball to respond to pressure differentials across the interface and effectively block backflow while maintaining connection to both fluid paths.
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
Prevents under-infusion and backflow, ensuring proper drug delivery by restricting the flow of secondary drugs into the primary line, thereby maintaining the correct drug dosage concentration and preventing particulate matter from reaching the patient.
Implementation Method 1
the floating valve member being displaceable in a proximal direction by a buoyant force exerted on the base when a level of fluid in the chamber exceeds a predetermined level
Data Source
AI summary
A flow control device includes an upper housing, a lower housing, a chamber interposed between and defined by the upper and lower housings, and a valve member. The upper housing includes a primary inlet having an internal surface defining a cavity and a secondary inlet. The lower housing defines an outlet of the flow control device. The chamber fluidly connects the primary and secondary inlets with the outlet. A valve member is reciprocally disposed at least partially in the cavity and partially in the chamber to (i) selectively permit fluid flow in the primary inlet in a first direction when a fluid level in the chamber is below a predetermined level, and (ii) prevent fluid backflow in a second direction opposite to the first direction when the fluid level in the chamber is above the predetermined level.