IV Drip Chamber Filter Positioning for Air Bubble Removal
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Solution Overview
Problem
Current IV sets face challenges in completely removing air bubbles during priming, leading to potential air embolism risks, especially in pediatric applications, and existing methods are time-consuming and prone to contamination.
Innovation Solution
A drip chamber design with a filter assembly separating upper and lower reservoirs, positioned to prevent dislodged air bubbles from entering the IV fluid line, combined with methods like agitating and occluding the IV line to force bubbles through the filter, ensuring air bubbles are redirected away from the IV line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is positioned at the bottom of the drip chamber to remove air bubbles, then air bubble removal is improved, but dislodged bubbles may be drawn into the IV tubing
Solution Approach 1:
The filter is repositioned from a bottom position to a lateral position on the side wall of the drip chamber. This dimensional change in filter placement creates a geometric relationship where the filter surface is angled relative to the IV tubing entrance, causing dislodged bubbles to follow the chamber wall rather than entering the tubing.
Solution Approach 2:
The filter surface is designed to be substantially coplanar with the inner surface of the drip chamber wall at the point where the IV tubing enters. This creates a smooth, continuous surface that prevents bubble accumulation and directs bubbles along the wall away from the tubing entrance, eliminating the harmful effect of bubble entry.
2Productivity
If liquid flows rapidly through the tubing to clear air bubbles, then bubble removal speed is improved, but turbulence increases and traps more air
Solution Approach 1:
The air bubble removal function is extracted from the flow dynamics and assigned to a dedicated filter component. Bubbles are removed at the filter surface through coalescence and detachment rather than relying on high-velocity flow to carry them through the system, eliminating the turbulence problem.
Solution Approach 2:
The filter surface acts as an intermediary between the liquid flow and air bubbles. Instead of allowing high-velocity flow to directly interact with bubbles (causing turbulence and entrapment), the filter provides a controlled interface where bubbles can be safely removed at low flow rates.
3Productivity
If the drip chamber is squeezed to draw liquid into the chamber during priming, then priming speed is improved, but air bubbles are generated at the liquid surface
Solution Approach 1:
The filter is pre-positioned at the lateral surface of the drip chamber before priming begins. This preliminary arrangement ensures that any bubbles generated during rapid filling are immediately captured by the filter surface rather than entering the IV tubing, allowing fast priming without bubble generation problems.
Solution Approach 2:
The filter converts the harmful effect of bubble generation during rapid filling into a beneficial outcome. Bubbles that would normally enter the tubing are instead captured by the filter surface, where they coalesce and detach harmlessly, transforming the priming process from a bubble-generating operation into a bubble-removing operation.
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 air bubbles from entering the patient's bloodstream during infusion, reducing the risk of air embolism and contamination, while optimizing the debubbling process for efficiency and safety.
Implementation Method 1
The filter assembly includes a filter membrane and one or more filter brackets that are configured to secure and maintain a position of the filter membrane in the drip chamber
Implementation Method 2
The distance between the filter assembly and the bottom surface is selected to prevent dislodged air bubbles from being drawn into the intravenous fluid line
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A drip chamber having an upper reservoir that is separated from a lower reservoir via a filter assembly, wherein a distance between the filter assembly and a bottom surface of the drip chamber is selected to prevent dislodged air bubbles of the filter assembly from being drawn into an intravenous fluid line that is coupled to the bottom surface of the drip chamber, during an infusion procedure.