Microchannel Dialyzer Mass Transfer Efficiency
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Solution Overview
Problem
Hollow fiber dialyzers have inefficient dialysate flow distribution leading to mal-distribution of mass transfer, requiring large quantities of dialysate solution, complex equipment, and limiting home dialysis capabilities due to size and operational complexity.
Innovation Solution
A microtechnology-based dialyzer with embedded parallel or perpendicular microchannel arrays and structured flow paths, utilizing semipermeable membrane sheets and flow separators in a laminae stack to enhance mass transfer efficiency and reduce dialysate usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hollow fiber dialyzers are used, then dialysis treatment can be performed, but dialysate flow distribution is uneven leading to mal-distribution of mass transfer and reduced efficiency
Solution Approach 1:
The invention divides the dialysis chamber into multiple discrete flow channels separated by spacers. Each channel provides a defined flow path with consistent spacing between opposing membrane surfaces, eliminating the uneven inter-fiber spacing of hollow fiber dialyzers. This segmentation ensures uniform dialysate flow distribution across all channels, optimizing mass transfer efficiency.
Solution Approach 2:
The invention transitions from the three-dimensional random packing of hollow fibers to a two-dimensional planar channel structure. By arranging membranes in parallel planes with spacers maintaining consistent gaps, the system achieves uniform flow distribution in a controlled geometric configuration, improving mass transfer while simplifying the flow field structure.
2Quantity of substance
If hollow fiber dialyzers with small inter-fiber spacing are used, then diffusion is enhanced, but dialysate usage efficiency is limited by stagnant flow and shunt flow areas
Solution Approach 1:
The invention creates locally optimized flow conditions in each channel with consistent spacing that prevents stagnant zones. The uniform gap between opposing membrane surfaces ensures that dialysate flows uniformly across the entire membrane surface area, eliminating the shunt flow and stagnant regions present in hollow fiber configurations. This local quality control maximizes dialysate utilization efficiency.
3Quantity of substance
If large quantities of dialysate solution are used, then dialysis treatment can be performed with hollow fiber dialyzers, but the dialysis machine size and water purification requirements increase
Solution Approach 1:
The invention changes the flow distribution parameters by using planar channels with uniform spacing instead of random fiber packing. This parameter change enables efficient dialysate utilization with reduced flow rates, as the controlled geometry ensures all dialysate contacts membrane surface effectively. The reduced dialysate volume requirement directly decreases water purification system size and overall machine footprint.
4Ease of operation
If hollow fiber dialyzers are used, then dialysis treatment can be performed at dialysis centers, but the equipment is too complex and large for home use by lay persons
Solution Approach 1:
The modular planar channel structure with standardized components (membranes, spacers, channels) enables compact integration. This segmentation approach allows the dialyzer to achieve high mass transfer efficiency in a reduced volume, making the overall dialysis system more suitable for home use by lay persons while maintaining treatment effectiveness.
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 microchannel design significantly reduces dialysate requirements, minimizes equipment size, and improves solute clearance, enabling more frequent and efficient home dialysis treatments by optimizing dialysate flow and reducing membrane surface area needed.
Implementation Method 1
A dialyzer is a device for cleansing blood through hemodialysis by a process of diffusion and convection of waste products, dissolved solutes and fluid from the blood across a semi-permeable membrane into a dialysis solution
Implementation Method 2
A dialyzer is a device for cleansing blood through hemodialysis by a process of diffusion and convection of waste products, dissolved solutes and fluid from the blood across a semi-permeable membrane
Implementation Method 3
The microtechnology-based design maintains micro-scale dimensions evenly on both sides of the membrane... Small characteristic sizes provided by the microchannels provide the benefits of large surface-to-volume ratios, laminar flow conditions
Data Source
AI summary
The present invention is related to hemodialysis, and more particularly, to a dialyser with improved efficiency of mass transfer across a dialysis membrane utilizing microchannel separation provided in accordance with embodiments of the present invention. In accordance with an embodiment, a dialyzer is provided comprising a plurality of semipermeable membrane sheets and a plurality of flow separators. The membrane sheets and flow are arranged in alternating configuration and coupled into a laminae stack defining a plurality of parallel microchannel layers. Each microchannel layer comprises a plurality of first microchannels and a plurality of second microchannels. The first and second microchannels of each microchannel layer are in fluid communication with each other via one of the plurality of membrane sheets therebetween. The MECS dialyzer is characterized as having a high surface to volume ratio and a high mass transfer coefficient.