Permeation Cell With Interchangeable Support Discs for Bubble Control
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Solution Overview
Problem
Existing permeation cells lack flexibility in varying the permeation surface, suffer from air bubble formation, poor reproducibility, and are not well-suited for transmucosal permeation studies, with challenges in handling semi-solid samples and visibility issues during testing.
Innovation Solution
A permeation cell design featuring interchangeable support discs with varying central hole diameters, magnetic fastening, and hydrodynamic compatibility, allowing easy adjustment of permeation surface and volume, and preventing air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed permeation surface is designed in known permeation cells, then the device structure is simple, but the adaptability to vary permeation surface is poor
Solution Approach 1:
The permeation cell is divided into a body and interchangeable support discs with different central hole diameters. Each support disc is a separate component that can be replaced to change the permeation surface area, allowing the device to adapt to different experimental requirements without redesigning the entire cell structure.
Solution Approach 2:
The permeation surface area is made dynamically adjustable by allowing users to interchange support discs with different central hole diameters. This transforms a static device into one that can be configured for different permeation surface requirements (e.g., 1 cm², 3 cm², 6 cm²) based on experimental needs.
2Reliability
If sampling and restoring operations are performed in known permeation cells, then the acceptor fluid can be refreshed, but air bubbles form below the membrane causing test invalidation
Solution Approach 1:
The cell body is designed with a tilted bottom that creates a hydrodynamic flow pattern, establishing equipotential conditions that guide liquid flow along the membrane surface. This flow pattern prevents air bubbles from accumulating below the membrane during sampling and fluid restoration operations, eliminating the harmful effect of bubble formation.
Solution Approach 2:
The tilted bottom design utilizes hydraulic principles to create continuous liquid flow that sweeps air bubbles away from the membrane-substrate interface. The hydrodynamic conditions ensure that bubbles are carried along the flow path and do not trap beneath the membrane, maintaining test reliability.
3Adaptability or versatility
If vertical diffusion cells are used for in-vitro permeation studies, then the release of pharmaceuticals can be assessed, but the permeation surface cannot be easily varied
Solution Approach 1:
The support disc is designed as a separable component with a central hole whose diameter determines the permeation surface. By segmenting this critical dimension into interchangeable parts, the system enables easy adjustment of permeation surface area without requiring complex mechanical adjustment mechanisms or specialized tools.
Solution Approach 2:
The cell body is designed as a universal platform that can accommodate multiple support discs with different central hole diameters. This multi-functional design allows a single cell body to perform various permeation studies with different surface areas (1 cm², 3 cm², 6 cm², etc.), eliminating the need for multiple specialized cells.
4Device complexity
If the membrane is placed directly on the substrate in known permeation cells, then the setup is simple, but air bubbles form and the permeation surface decreases
Solution Approach 1:
The tilted bottom of the cell body creates a hydrodynamic environment that establishes equipotential flow conditions along the membrane surface. This flow pattern prevents air bubbles from trapping between the membrane and substrate, ensuring stable permeation surface area throughout the experiment.
Solution Approach 2:
Hydraulic flow generated by the tilted bottom design creates a liquid current that continuously sweeps the interface between membrane and substrate. This hydrodynamic action prevents air bubble entrapment and maintains consistent contact between the membrane and support disc, stabilizing the effective permeation surface.
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 easy variation of permeation surface and volume, reduces air bubble formation, enhances reproducibility, and supports transmucosal permeation studies, improving experimental reliability and efficiency.
Implementation Method 1
The support disc can be interchangeable, allowing easy variation of the permeation surface
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
A kit comprising a permeation cell (1, 1'), in particular of the horizontal- or vertical-diffusion type, provided with a membrane (16) and with at least one support disc (14) for the membrane (16); wherein the support disc (14) is provided with a central hole (140) having a dimension ranging between 1 and 10 cm2; and wherein the support disc (14) is adapted to be replaced with another support disc provided with a central hole having a different dimension with respect to the central hole of the support disc (14) so as to vary the permeation surface; the kit also comprising at least one further support disc for the membrane (16), configured to replace the support disc (14) adapted to be replaced with another support disc provided with a central hole having a different dimension with respect to the central hole of the support disc (14) so as to vary the permeation surface.