Nanoporous Membrane with PEG Coating for Middle Molecule Removal
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Solution Overview
Problem
Current dialysis methods, such as hemodialysis, are limited by the need for bulky equipment, protein fouling, and inefficiencies in removing middle molecules like β2-microglobulin, which accumulates in renal failure patients, leading to toxicity and requires improved filtration membranes that mimic the native kidney's function.
Innovation Solution
Development of nanoporous membranes with slit-shaped pores and surface coatings like polyethylene glycol to prevent protein fouling, allowing for efficient convective transport of solutes and reduced transmembrane pressures, enabling the creation of ultrafiltration devices for both in vitro and in vivo applications, including bioartificial organs and diagnostic tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hemodialysis membranes are used, then small molecules can be removed, but middle molecules like β2-microglobulin are not effectively removed and protein fouling occurs
Solution Approach 1:
The patent employs nanoporous membranes with precisely controlled pore sizes (e.g., 3-10 nm) that enable size-based separation. The porous structure allows middle molecules like β2-microglobulin to pass through while blocking larger proteins, achieving both improved productivity for middle molecule removal and reliability through reduced protein fouling.
Solution Approach 2:
The invention changes the critical parameter of pore size to optimize filtration performance. By controlling pore dimensions at the nanoscale and adjusting pore size distribution, the membrane achieves selective permeability that enhances middle molecule removal while preventing protein fouling, resolving the contradiction between productivity and reliability.
2Productivity
If larger pore sizes are used to improve convective transport, then middle molecule removal efficiency increases, but protein leakage occurs
Solution Approach 1:
The patent utilizes nanoporous membranes with precisely engineered pore size distributions where the mean pore size falls within the 3-10 nm range. This porous structure enables efficient convective transport of middle molecules while the controlled pore size distribution prevents protein leakage, as proteins are significantly larger than the pore dimensions.
Solution Approach 2:
The invention applies local quality by creating heterogeneous pore size distributions within the membrane structure. Different regions or populations of pores have optimized sizes for specific functions: smaller pores prevent protein leakage while larger pores facilitate middle molecule transport, achieving both high productivity and selectivity simultaneously.
3Ease of operation
If conventional dialysis membranes are used, then small molecule diffusion occurs, but the process requires bulky equipment and high transmembrane pressures
Solution Approach 1:
The patent replaces the conventional diffusive transport mechanism with convective transport through nanoporous membranes. This substitution eliminates the need for bulky dialysis machines and high transmembrane pressures, as convective flow can be achieved with much lower pressure gradients, enabling portable and implantable device designs.
Solution Approach 2:
The nanoporous membrane structure enables the system to utilize the patient's own blood pressure as the driving force for ultrafiltration, eliminating the need for external pumps and bulky equipment. The membrane's intrinsic pore structure facilitates convective transport that works with physiological pressure gradients, achieving ease of operation and portability.
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 nanoporous membranes effectively filter out toxins and small molecules while preventing protein fouling, enhancing the service life of filtration devices and enabling portable or implantable ultrafiltration systems that mimic the native kidney's function, improving patient outcomes for renal failure treatment.
Implementation Method 1
convective transport via ultrafiltration may be far more efficient than diffusive clearance through dialysis
Implementation Method 2
water and small solutes are forced through a specialized tissue structure comprised of the cells and connective tissue of the glomerular capillary tuft
Implementation Method 3
nanoporous membranes configured to avoid protein fouling
Data Source
AI summary
The present invention relates to ultrafiltration. In particular, the present invention provides nanoporous membranes having pores for generating in vitro and in vivo ultrafiltrate, devices and bioartificial organs utilizing such nanoporous membranes, and related methods (e.g., diagnostic methods, research methods, drug screening). The present invention further provides nanoporous membranes configured to avoid protein fouling with, for example, a polyethylene glycol surface coating.