Asymmetrical Dialyzer Header Cap for Uniform Blood Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dialyzers experience issues with non-uniform blood flow distribution, mechanical stress on blood cells, and inefficient osmotic transfer due to pressure differentials and design constraints, leading to reduced efficiency and potential harm to patients.
Innovation Solution
A dialyzer header cap with an asymmetrical, concave shape and specific geometric configurations, such as an asymmetrical elliptic paraboloid, is designed to improve blood flow uniformity, reduce mechanical stress, and enhance osmotic transfer efficiency by minimizing air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a centrally aligned inlet port is used in existing dialyzers, then the structure is simple and easy to manufacture, but blood flow distribution becomes non-uniform and mechanical stress on blood cells increases
Solution Approach 1:
The patent applies asymmetry by positioning the inlet port off-center and designing the header cap with an asymmetrical internal geometry. This asymmetric configuration redistributes blood flow more uniformly across the fiber bundle entrance, reducing non-uniform flow distribution and mechanical stress on blood cells while maintaining manufacturing feasibility.
Solution Approach 2:
The patent introduces dimensional changes by designing the header cap with a specific internal geometry that includes a first region and a second region with different cross-sectional areas. This three-dimensional geometric variation guides blood flow distribution across multiple dimensions, improving uniformity of flow into the fiber bundle.
2Speed
If pressure differentials are created during blood entry, then blood flow into hollow fibres is driven, but mechanical stress on blood and blood cells increases and flow efficiency is impaired
Solution Approach 1:
The patent applies beforehand cushioning by designing the header cap with a gradual transition geometry between regions of different cross-sectional areas. This gradual transition cushions the blood flow against sudden pressure changes, reducing mechanical stress on blood cells while maintaining adequate flow velocity into the hollow fibres.
Solution Approach 2:
The patent employs curvature principles by designing the header cap internal surface with smooth curved transitions rather than sharp angles. This curved geometry reduces turbulence and mechanical stress on blood cells while maintaining efficient blood flow distribution into the fiber bundle.
3Productivity
If the header cap geometry is optimized for uniform blood distribution, then blood flow uniformity improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by designing the header cap with different geometric characteristics in different regions. The first region has a larger cross-sectional area to receive blood flow, while the second region has a smaller cross-sectional area to distribute flow uniformly into the fiber bundle. This localized geometric variation achieves flow uniformity without requiring complex overall device architecture.
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 new header cap design achieves a 30-35% improvement in blood flow distribution uniformity, reduces mechanical stress by 12% or more, and decreases air bubble formation by 30-35%, thereby enhancing overall dialysis efficiency and patient safety.
Implementation Method 1
the structure of the header cap of the dialyzer can play a significant role in determining how blood flow in the dialyser is managed
Implementation Method 2
Low molecular weight metabolites, such as urea, pass from the blood into the dialysate through osmotic action
Data Source
Figure 3a
Figure 3b
Figure 3c
AI summary
A dialyzer header cap, comprising an asymmetrical curved surface forming a hollow, wherein said hollow comprises an opening which comprises the outlet port, and further comprising an inlet port attached to the curved surface, wherein the inlet port is essentially orthogonal to the outlet.