Air Separator Orifice Orientation for Bubble Separation
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Solution Overview
Problem
Existing air separators in extracorporeal blood treatment systems fail to effectively separate air bubbles from blood, leading to undesirable air reaching the outlet, foam formation, and stagnation areas that can cause clotting.
Innovation Solution
The air separator design features an orifice positioned distant from the outlet, directing fluid towards the top of the chamber, with a channel of progressively increasing cross sections to reduce flow speed and stabilize flow, and includes a filter positioned far from the inlet to prevent bubble trapping and stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the orifice is positioned close to the outlet port, then the chamber volume is reduced, but air bubbles reach the outlet without sufficient separation time
Solution Approach 1:
The patent positions the orifice distant from the outlet port along the longitudinal axis of the chamber, utilizing the length dimension to provide sufficient separation distance. This dimensional arrangement allows air bubbles to rise and separate from the liquid stream before the liquid reaches the outlet, resolving the contradiction between separation efficiency and chamber volume.
2Reliability
If the orifice directs liquid towards the bottom of the chamber, then the chamber structure is simplified, but foam formation increases and air separation efficiency decreases
Solution Approach 1:
The patent specifies that the orifice be oriented to direct liquid towards the top of the chamber rather than the bottom. This localized directional control at the orifice creates favorable flow conditions for air separation at the critical inlet region, improving separation efficiency without requiring complex overall chamber structure.
3Reliability
If the channel has constant cross section, then the manufacturing is simpler, but flow speed remains high causing foam formation and poor air separation
Solution Approach 1:
The patent employs a channel with progressively increasing cross-sectional area from inlet to outlet. This gradual parameter change in the channel geometry reduces flow velocity along the channel length, minimizing foam formation and enhancing air separation efficiency. The progressive expansion is a standard manufacturing feature that balances performance improvement with fabrication simplicity.
4Reliability
If the filter is positioned close to the inlet orifice, then the device length is reduced, but stagnation areas form leading to clotting risk
Solution Approach 1:
The patent positions the filter downstream at a sufficient distance from the inlet orifice, allowing the liquid flow to stabilize and air bubbles to separate before reaching the filter. This preliminary flow stabilization prevents stagnation areas from forming at the filter surface, eliminating clotting risk while maintaining a compact overall device length through optimized spacing.
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
This design significantly reduces air bubble presence at the outlet, minimizes foam formation, and decreases the risk of clotting by allowing bubbles to separate before reaching the outlet and preventing stagnation areas, ensuring efficient air separation and stable fluid flow.
Implementation Method 1
an inlet (first) channel where flow speed is significantly reduced and flow stability increased using two or more consecutive portions of progressively increasing cross section
Implementation Method 2
the orifice is oriented so as to direct the liquid towards the top of the blood chamber... allowing the bubbles to separate from blood before this latter reaches the outlet port
Data Source
AI summary
An air separator (1) comprises a first chamber (2) where blood or other fluid can be received, an inlet and an outlet port associated to the bottom wall (4) and in fluid communication with the first chamber. A first channel (14) extending along the lateral wall of the separator and has a first and a second portion (16 and 18). The channel second portion (18) terminally forms an orifice (15) facing the chamber and extending in an area closer to a top wall (5) of the chamber (2) than to the bottom wall of the same chamber. The orifice faces the top of the separator and has a flow passage cross section greater than that of a first portion (16) of the channel.