Oxygenator Cover Recessed Wall Sampling Port
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Solution Overview
Problem
In existing oxygenators, ambient air can enter and mix with the gas being sampled from the gas exchange unit through pressure control holes, altering the gas composition.
Innovation Solution
The oxygenator design includes a second cover member with a recessed wall portion for the sampling port, positioned closer to the gas exchange unit than the cover main body, and a pressure control hole in the cover main body to control gas pressure, thereby minimizing ambient air entry into the sampling port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pressure control hole is formed through the cover main body to control gas pressure, then gas pressure control is improved, but ambient air enters and mixes into the sampling port altering gas composition
Solution Approach 1:
The cover member is segmented into a cover main body and a recessed wall portion, with the sampling port located in the recessed wall portion that is recessed relative to the cover main body. This segmentation creates a spatial separation where the sampling port is positioned closer to the gas exchange unit than the pressure control hole, allowing pressure control while preventing ambient air contamination of the sampled gas
Solution Approach 2:
The recessed wall portion acts as an intermediary structure between the cover main body and the gas exchange unit. It provides a protected sampling port location that is shielded from ambient air entering through the pressure control hole, while still allowing access to the gas flow from the gas exchange unit
2Device complexity
If the sampling port is disposed in the cover main body, then gas collection is simplified, but ambient air mixing into the sampling port occurs
Solution Approach 1:
The cover member is divided into functional zones: the cover main body for pressure control and the recessed wall portion for sampling. This segmentation allows the sampling port to be protected from ambient air while maintaining a relatively simple overall structure
Solution Approach 2:
The sampling port is positioned in a different spatial dimension (recessed wall portion) relative to the pressure control hole (cover main body). By creating a recessed structure, the sampling port is placed in a protected zone that is shielded from ambient air contamination while still accessible for gas collection
3Productivity
If the sampling port is positioned closer to the gas exchange unit, then gas collection efficiency is improved, but the risk of ambient air contamination increases
Solution Approach 1:
The recessed wall portion creates a protected sampling zone that is close to the gas exchange unit for efficient gas collection, while the cover main body with the pressure control hole remains separated. This segmentation allows the sampling port to be positioned optimally without exposing it to ambient air contamination
Solution Approach 2:
The recessed wall portion serves as an intermediary structure that enables the sampling port to be positioned close to the gas exchange unit while protecting it from ambient air. The recessed structure acts as a barrier that prevents contaminated air from reaching the sampling port
Data Source
AI summary
A cover member (36) that forms an end of a housing (26) of an oxygenator (10) has a recessed wall portion (88) recessed relative to a cover main body (74) further toward a side of a gas exchange unit (30) than an inner surface (74a). A pressure control hole (86) is formed through a main body (74) of the cover member (36), and a sampling port (90a) is disposed in the second recessed wall portion (88) to collect gas guided out from the gas exchange unit (30). The sampling port (90a) faces, at its inner opening portion (92), a second outlet side end face (31b) of the gas exchange unit (30).