Inline Microgravity Air Trap Centrifugal Separation
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Solution Overview
Problem
In microgravity environments, such as spaceflight, traditional IV fluid delivery systems fail to effectively exclude air bubbles due to the absence of gravity, leading to potential health risks like air embolisms, as terrestrial air filters are not designed to handle the high pressure-driven flow rates and large air volumes encountered in these conditions.
Innovation Solution
An inline microgravity air trap device is developed, featuring an elongate air trap chamber with a filter and structural insert, utilizing centrifugal force to separate air bubbles from fluids, allowing them to pass through a filter and exit, while the gas-depleted fluid continues to the patient, effectively managing large air volumes intermixed with fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terrestrial air filters are used in microgravity environments, then air bubbles can be filtered under normal gravity conditions, but the filters cannot handle high pressure-driven flow rates and large air volumes in microgravity
Solution Approach 1:
The patent changes the separation mechanism from gravity-dependent buoyancy to centrifugal force generation. By introducing a rotating element that creates centrifugal acceleration, the system transforms the physical parameters governing fluid-gas separation, enabling effective air bubble exclusion under high flow rates and pressure conditions where traditional gravity-based filters fail in microgravity environments
Solution Approach 2:
The patent replaces the passive mechanical filtration system with an active centrifugal separation system. Instead of relying on passive filter media that clog under high air volumes, the invention uses rotational mechanics to generate centrifugal forces that actively separate gas from fluid, allowing the system to handle large air volumes and high flow rates that would overwhelm conventional filters
2Ease of operation
If pressure bags are used to deliver fluid in microgravity, then fluid delivery can be maintained without gravity, but excessive air in the IV tubing cannot be effectively removed
Solution Approach 1:
The patent merges the fluid delivery function with the air removal function into a single integrated device. The centrifugal separation chamber simultaneously serves as both the fluid administration interface and the gas-liquid separation mechanism, eliminating the need for separate pressure bags and air traps while addressing both fluid delivery and air embolism prevention in microgravity environments
3Reliability
If gravity-based air separation is used, then air bubbles can be excluded under normal Earth conditions, but the separation mechanism fails in microgravity environments
Solution Approach 1:
The patent fundamentally changes the physical parameter driving separation from gravitational acceleration to centrifugal acceleration. By rotating the separation chamber or introducing a rotating element, the system generates artificial gravity through centrifugal force, enabling air bubble exclusion to function reliably in microgravity environments where natural gravity is absent
Solution Approach 2:
The patent transitions from a static, gravity-dependent separation system to a dynamic, rotation-based system. The introduction of rotational motion creates time-varying centrifugal forces that actively separate gas from fluid, making the system adaptable to both terrestrial and microgravity environments by changing the operational state from static to dynamic
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 significantly outperforms commercial filters at higher pressures and flow rates, effectively removing air bubbles, reducing the risk of air embolisms and ensuring safe IV fluid delivery in microgravity environments.
Implementation Method 1
The Helical baffle is formed to direct fluid from the pressurized fluid supply to accelerate centrifugally around the filter, forcing gas contained in the fluid to pass through the filter into the interior of the tube
Data Source
AI summary
An inline microgravity air trap device includes an elongate air trap chamber, the air trap chamber having a blind end, an opposite air outlet end containing a gas egress opening, a fluid inlet port connecting to a pressurized fluid supply, a fluid outlet port connecting the air trap chamber to a fluid delivery destination, a filter forming a tube having an interior, a first end at the blind end of the air trap chamber and a second end at the gas egress opening, and a structural insert in the interior of the tube, having a first insert end located at the blind end, and a second insert end located the air outlet end, where the chamber is formed to direct fluid from the pressurized fluid supply to accelerate centrifugally around the filter, forcing gas contained in the fluid to pass through the filter into the interior of the tube.