Modular Sorbent Cartridge Geometry for Low-Volume Dialysate Filtration
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Solution Overview
Problem
Existing dialysis systems face inefficiencies in filtering waste products and require large volumes of dialysate, leading to increased system size and cost, particularly in at-home settings, due to the limitations of traditional sorbent cartridges with aspect ratios of 1:1 and reliance on powdered sorbent materials.
Innovation Solution
The development of sorbent cartridges with an aspect ratio of at least 1.5:1, utilizing replaceable sorbent blocks like activated carbon, zirconium phosphate, and zirconium oxide, arranged in a cylindrical geometry with modular replaceable containers, and incorporating a dissolvable element to prevent particle segregation, allowing for efficient filtration and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sorbent cartridges with aspect ratio of 1:1 are used, then the system structure is simple, but filtration efficiency is insufficient and large dialysate volumes are required
Solution Approach 1:
The patent applies asymmetry by changing the traditional 1:1 aspect ratio of sorbent cartridges to at least 1.5:1 (length:diameter). This asymmetric geometry increases the surface area to volume ratio, improving filtration efficiency while reducing the volume of dialysate required, without excessively complicating the cartridge structure.
Solution Approach 2:
The patent transitions from a compact, low aspect ratio design to an extended high aspect ratio design, utilizing the longitudinal dimension more effectively. This dimensional change allows for improved filtration performance by increasing the contact path length between dialysate and sorbent materials.
2Reliability
If powdered sorbent materials are used, then the cartridge can be easily manufactured, but particle segregation occurs and filtration predictability decreases
Solution Approach 1:
The patent changes the physical state parameter of sorbent materials from powdered form to solid block form. This parameter change eliminates particle segregation issues inherent to powders, improves filtration predictability, and maintains ease of manufacture through standardized block fabrication and replacement procedures.
Solution Approach 2:
The patent employs composite sorbent blocks that may combine multiple sorbent materials (such as activated carbon, zirconium phosphate, and zirconium oxide) in a unified solid structure. This composite approach maintains the benefits of different materials while eliminating the segregation problems of mixed powders.
3Quantity of substance
If large volumes of dialysate are used, then adequate filtration is achieved, but system size and cost increase
Solution Approach 1:
The high aspect ratio cartridge design (at least 1.5:1) increases the filtration surface area and contact efficiency, allowing adequate waste removal with reduced dialysate volumes. This asymmetric geometry enables the system to achieve the same filtration performance with less fluid, reducing overall system weight.
4Stability of the object's composition
If sorbent blocks are used instead of powders, then particle segregation is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent changes the physical form parameter from powder to solid block, which fundamentally improves material homogeneity and eliminates segregation. The manufacturing complexity is managed through standardized block fabrication processes and modular replacement designs that simplify the overall manufacturing system.
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
This design enhances filtration efficiency, reduces the need for large dialysate volumes, decreases system size, and lowers patient costs by using sorbent blocks instead of powders, providing predictable filtration and reducing pressure drop.
Implementation Method 1
a plurality of sorbent materials arranged in series between the fluid inlet and the fluid outlet... the plurality of sorbent materials include one or more of activated carbon, zirconium phosphate, or zirconium oxide
Data Source
AI summary
A sorbent cartridge for filtering dialysate in a dialysis system is disclosed. The cartridge can include a fluid inlet, a fluid outlet, a plurality of sorbent materials arranged in series between the fluid inlet and the fluid outlet, and a recharging solution disposed in a container. Each of the plurality of sorbent materials can be disposed in a respective replaceable container. The plurality of sorbent materials can be arranged for fluid flow in a longitudinal direction of the respective replaceable container. The recharging solution can be selectively fluidly connected to one or more of the plurality of sorbent materials.