Dialysis Cell Support Structure for Reproducible Release Testing
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Solution Overview
Problem
Existing in vitro release test apparatuses face challenges in achieving reproducible and standardizable measurement results due to variations in dialysis membrane sealing and contact with container walls, leading to inconsistent release data.
Innovation Solution
A dialysis cell with a support structure that fixes the dialysis membrane in a stable shape, preventing contact with the container and ensuring a constant exchange surface, attached to the apparatus via a detachable mounting system, allowing for standardized and reproducible release behavior testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dialysis bag floats freely in the substance uptake fluid, then the dialysis membrane can be constantly in motion within the fluid, but the exchange surface becomes difficult to replicate and measurement results are not reproducible
Solution Approach 1:
The patent changes the state of the dialysis membrane from free-floating to fixed by attaching it to a support structure. This parameter change (from mobile to stationary) resolves the contradiction by maintaining the membrane's position consistency (improving reproducibility) while still allowing it to be surrounded by substance uptake fluid (maintaining operational functionality).
Solution Approach 2:
The patent introduces a support structure as an intermediary element between the dialysis membrane and the substance uptake fluid environment. This intermediary component provides the necessary mechanical support to fix the membrane in place, enabling reproducible measurement surfaces while maintaining the membrane's exposure to the fluid for substance exchange.
2Device complexity
If the dialysis bag floats freely in the container, then the setup is simple, but the dialysis bag can come into contact with the container wall at random points making predefined test procedure impossible
Solution Approach 1:
The support structure serves as an intermediary that takes over the position control function from the container walls. By providing a dedicated mounting structure with defined positioning elements, the system achieves precise position control without requiring complex container designs or manual positioning procedures.
Solution Approach 2:
The patent segments the dialysis system into distinct functional components: the dialysis membrane, the support structure, and the mounting mechanism. This segmentation allows each component to be optimized independently - the membrane for substance exchange, the support structure for positioning, and the mounting mechanism for secure attachment - thereby achieving precision without excessive overall complexity.
3Ease of manufacture
If clamps are used to seal the tube ends, then the dialysis bag can be formed, but the sealing process causes significant variation in exchange surfaces
Solution Approach 1:
The support structure acts as an intermediary that replaces the clamp-based sealing method. Instead of using clamps that create variable sealing pressure and inconsistent exchange surfaces, the support structure provides a standardized interface for membrane attachment, ensuring consistent exchange surface geometry across all dialysis membranes.
Solution Approach 2:
The patent changes the sealing method from mechanical clamping (which creates variable pressure and inconsistent surfaces) to a standardized attachment system where the membrane is secured in a defined position. This parameter change (from variable pressure sealing to fixed position mounting) eliminates the variation in exchange surfaces while maintaining ease of manufacture through standardized procedures.
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
Enables consistent and comparable release data across different substance compositions, facilitating the determination of release rates of substances bound to molecular carriers like liposomes or nanoparticles, by maintaining a fixed and standardized exchange surface during testing.
Implementation Method 1
The dialysis membrane is permeable to the substance receiving fluid as well as to the substance released into the substance receiving fluid
Implementation Method 2
the dialysis membrane that retains the bound substances of the substance composition within the bag
Data Source
Figure 1
Figure 2~5
AI summary
The invention relates to a dialysis cell for an in-vitro release test apparatus for identifying a release behavior, such as a release rate, a substance of a material composition, such as a medication, said substance being bonded to molecular carriers such as liposomes, micelles or nanoparticles, relative to a substance absorption fluid having a cell interior and a dialysis membrane at least partially bordering the cell interior which retains the bound substance, is permeable for the substance released in the substance absorption fluid and is at least partially permeable for the substance absorption fluid, wherein the dialysis membrane is fastened to a support structure which is designed for permanent assembly of the dialysis cell at an assembly position which is stationary relative to the in-vitro release test apparatus.