Buoyant Drip Chamber Geometry to Prevent IV Backflow
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Solution Overview
Problem
Existing IV systems with secondary fluid lines fail to prevent secondary drug backflow into primary line, leading to under-infusion and backflow, which is prone to failure of the check valve due to debris accumulation and pressure differential at the back check valve failure, which is prone to failure due to debris existing in infusates and minimal pressure differential at the back check valve affecting its performance. The secondary drug feed could potentially flow backwards into the primary fluid line leading to under-infusion and backflow, which is prone to failure of the check valve due to debris accumulation and minimal pressure differential at the back check valve affecting its performance.
Innovation Solution
A drip chamber device with a housing having a convergent-divergent shape and a movable valve member that blocks fluid communication between the inlet and chamber when the fluid level exceeds a predetermined level, using a buoyant force to prevent backflow and under-infusion by blocking secondary fluid from entering the primary line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a check valve is positioned in the primary line to prevent backflow, then backflow prevention is improved, but reliability deteriorates due to check valve failure from debris accumulation and minimal pressure differential
Solution Approach 1:
The patent removes the check valve from the system entirely and replaces it with a passive geometric barrier (the convergent-divergent drip chamber structure) that prevents backflow through its physical design rather than through a mechanical valve component that can fail
Solution Approach 2:
The drip chamber acts as an intermediary structure between the primary and secondary fluid lines, using its convergent-divergent geometry to create a physical barrier that blocks backflow without requiring active valve components
2Object-affected harmful factors
If conventional drip chamber and check valve components are used, then backflow prevention is attempted, but device complexity increases and cost increases
Solution Approach 1:
The patent merges the drip chamber and backflow prevention functions into a single integrated structure, eliminating the need for separate check valves and conventional drip chamber components
Solution Approach 2:
The convergent-divergent drip chamber structure serves multiple functions simultaneously: it acts as a flow indicator, a backflow prevention mechanism, and a fluid control element, replacing multiple separate components
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 by blocking secondary fluid from entering the primary line, reducing the number of components, and minimizing costs by replacing the check valve and conventional drip chamber, while being compatible with existing IV pumps.
Implementation Method 1
The valve member may be displaceable in a proximal direction into the sealing ring by a buoyant force when fluid level in the chamber exceeds a predetermined level
Data Source
AI summary
A drip chamber device may include a housing including an inlet and an outlet disposed downstream of the inlet, and a chamber defined by an inner circumferential surface of the housing. The chamber may fluidly connect the inlet with the outlet. A valve member may be disposed in the chamber to move between (i) a closed state where fluid communication between the inlet and the chamber is blocked, and (ii) an open state where fluid communication between the inlet and the chamber is not blocked, based on a level of fluid within the chamber.