Cross-Flow Split-Thin-Flow Cell for Hemodialysis
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Solution Overview
Problem
Current dialysis methods are ineffective in removing β2-microglobulin due to low resolution, significant albumin loss, and hemocompatibility issues, failing to meet high-throughput requirements for hemodialysis applications.
Innovation Solution
A split thin-flow separations device with a fluid channel and cross-flow mechanism that separates components based on molecular weight, using a diffusional split-flow process to preferentially remove β2-microglobulin while minimizing albumin loss and maintaining high-throughput capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If membrane pore size is increased to improve β2-microglobulin removal, then toxin removal efficiency is improved, but albumin loss increases and endotoxin retake occurs
Solution Approach 1:
The invention changes the separation mechanism from size-exclusion (pore size) to hydrophobic interaction. By adjusting hydrophobicity parameters rather than pore size, the system achieves high β2-microglobulin removal while maintaining albumin retention, as hydrophobic interactions selectively target middle molecules without compromising albumin passage
Solution Approach 2:
The invention replaces the mechanical size-exclusion mechanism with a chemical hydrophobic interaction mechanism. This substitution allows selective removal of hydrophobic middle molecules like β2-microglobulin through affinity-based separation rather than physical filtration, eliminating the trade-off between toxin removal and protein loss
2Measurement precision
If adsorbent pore size is decreased to improve resolution, then separation precision is improved, but device complexity increases due to clogging risks
Solution Approach 1:
The invention replaces mechanical size-exclusion with hydrophobic interaction-based separation. This eliminates the need for precisely controlled small pores and complex adsorbent bed designs, as the separation is driven by chemical affinity rather than physical dimensions, thereby reducing device complexity while maintaining resolution
3Measurement precision
If adsorbent pore size is decreased to improve separation, then resolution is improved, but hemocompatibility deteriorates due to blood cell damage from high shear forces
Solution Approach 1:
The invention substitutes mechanical size-exclusion with hydrophobic interaction separation, eliminating the need for high-shear small-pore structures. This replacement removes the source of blood cell damage while preserving separation resolution, as the separation is achieved through chemical affinity rather than mechanical filtration
4Measurement precision
If affinity columns are used to improve specificity, then toxin removal selectivity is improved, but device complexity increases and particulate contamination occurs
Solution Approach 1:
The invention replaces complex affinity column structures with a simpler hydrophobic interaction system. This substitution maintains high specificity for middle molecule removal while reducing device complexity and eliminating particulate contamination risks associated with column-based systems
5Device complexity
If current dialysis methods are used to maintain simplicity, then device complexity is reduced, but productivity is insufficient for high-throughput hemodialysis
Solution Approach 1:
The invention changes the separation mechanism to hydrophobic interaction, which enables high-throughput operation while maintaining relative simplicity. This parameter change allows for improved productivity without requiring complex multi-component systems, as the hydrophobic mechanism provides efficient middle molecule removal in a streamlined configuration
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 achieves high-resolution separation of β2-microglobulin with minimal albumin loss and improved hemocompatibility, enhancing the efficiency of toxin removal during hemodialysis by utilizing a cross-flow based split-flow lateral-transport thin separation system.
Implementation Method 1
passing a sample fluid and a carrier fluid into a fluid channel under diffusional split-flow thin cell conditions
Implementation Method 2
a cross-flow fluid can be injected transversely across the fluid channel under conditions sufficient to augment separation
Data Source
AI summary
A split thin-flow separations device can include a fluid channel having an inlet zone, an outlet zone, and a transport region between the inlet zone and outlet zone. The inlet zone includes a sample inlet and a carrier fluid inlet which are fluidly separated by an inlet splitter to minimize mixing of fluids from respective inlets in the inlet zone. The transport region can be a substantially open channel. Similar to the inlet zone, the outlet zone can include a sample outlet and a carrier outlet which are fluidly separated by an outlet splitter to segregate portions of a fluid into each of the two outlets as the fluid enters the outlet zone. A plurality of cross-flow inducers can also be oriented along a wall of the fluid channel in the transport region. The cross-flow inducers are oriented to form a cross-flow field across the transport region.