Diffusion Device Core Ridges for End-Wall Delamination Resistance
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Solution Overview
Problem
Existing diffusion devices, such as blood oxygenators and gas exchangers, suffer from delamination of end walls from the core due to inadequate mechanical stress resistance, particularly at elevated temperatures, leading to potential leaks.
Innovation Solution
The diffusion device incorporates a cylindrical core with elongated noses and circumferential ridges on its outer surface to enhance the adhesion of end walls, using polyurethane resin to create a form closure and provide anchors, thereby improving the mechanical stability of the end walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cylindrical core has a smooth surface, then the device is easier to manufacture, but the end walls delaminate from the core under mechanical stress
Solution Approach 1:
The cylindrical core is designed with localized surface features (elongated noses and circumferential ridges) only in the regions where end walls contact the core. These local geometric modifications create form closure and mechanical anchors without requiring complex manufacturing processes for the entire core, thus resolving the contradiction between ease of manufacture and adhesion reliability.
Solution Approach 2:
The solution transitions from a two-dimensional smooth surface to a three-dimensional structured surface with protruding noses and ridges. This dimensional enhancement creates mechanical interlocking features that provide form closure and prevent delamination, while the features can be integrated into standard core manufacturing processes.
2Strength
If the end walls are tightly bonded to the core, then mechanical stress resistance is improved, but the device complexity increases
Solution Approach 1:
Instead of making the entire core complex, only specific regions (where end walls contact) are given enhanced geometric features. The elongated noses and circumferential ridges are localized structures that provide strong mechanical anchoring without requiring complex manufacturing throughout the entire core, thus achieving high strength with minimal added complexity.
Solution Approach 2:
The use of curved or rounded features (circumferential ridges and noses) on the core surface provides mechanical interlocking while maintaining a relatively simple overall core geometry. These curved features distribute stresses more effectively compared to sharp edges, enhancing mechanical strength without proportionally increasing manufacturing complexity.
Data Source
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AI summary
The present disclosure relates to a diffusion device, such as a blood oxygenator or gas exchanger, and a process for its production. The diffusion device is used in the removal of carbon dioxide from blood.