Deformable Membrane Actuator for Cell Culture Fluid Mixing
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Solution Overview
Problem
Current cell culturing and blood storage methods face limitations due to slow diffusion-based nutrient and metabolite exchange, leading to restricted cell growth and increased risk of platelet activation and coagulation without adequate agitation.
Innovation Solution
A biological cell preservation or culturing arrangement featuring a deformable, impermeable membrane driven by electroactive polymer actuators, which creates controlled fluid flow patterns to enhance nutrient supply and waste removal, thereby promoting efficient cell growth and preventing platelet activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If diffusion-based nutrient supply is used for cell culturing, then device complexity is reduced, but nutrient exchange efficiency deteriorates
Solution Approach 1:
The patent employs a deformable membrane that can dynamically change its surface topology through electroactive polymer actuators. This dynamic deformation creates time-varying flow patterns in the fluid, transforming the static diffusion-based system into a dynamic convection-enhanced system. The membrane's ability to change shape in response to electrical stimuli enables active control over nutrient exchange efficiency without adding complex mechanical pumping systems.
Solution Approach 2:
The patent replaces traditional mechanical agitation systems (such as magnetic stirrers or pump-based flow systems) with an electroactive polymer-driven deformable membrane. This substitution eliminates the need for bulky mechanical components while achieving enhanced fluid mixing and nutrient transport through electrically-controlled membrane deformation. The electroactive polymers convert electrical energy directly into mechanical deformation of the membrane surface.
2Reliability
If bulky shakers are used for blood storage, then platelet activation is prevented, but device complexity and portability deteriorate
Solution Approach 1:
The patent extracts the essential function of blood agitation (preventing platelet activation) from the bulky shaker system and implements it through a deformable membrane that directly contacts and agitates the blood. By removing the need for external shakers and temperature-controlled cabinets, the system achieves portable blood storage while maintaining platelet viability through localized membrane-driven fluid motion.
Solution Approach 2:
The deformable membrane serves multiple functions simultaneously: it provides structural containment for the blood, creates agitation through its deformation, and enables controlled fluid exchange. This self-service approach eliminates the need for separate agitation devices and simplifies the overall system architecture, making the blood storage device portable and self-contained.
3Ease of manufacture
If smooth surfaces are used in blood storage bags, then manufacturing is simplified, but platelet activation increases
Solution Approach 1:
The patent transforms the static smooth surface into a dynamic deformable surface that actively agitates the blood. The electroactive polymer actuators cause the membrane to change shape in real-time, creating fluid motion that prevents platelet activation. This dynamic approach maintains the manufacturing simplicity of smooth surfaces while adding the necessary agitation function through active deformation rather than static surface texturing.
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 solution enables efficient fluidic exchange between the membrane surface and the bulk fluid, supporting effective cell growth and preserving blood by preventing coagulation, with a compact, low-cost, and non-bulky design.
Implementation Method 1
an electroactive polymer actuator arrangement, arranged to deform the deformable membrane with the membrane retaining its impermeability, the electroactive polymer actuator arrangement being controllable to effect a controlled change in a surface topology of the deformable membrane
Data Source
AI summary
A biological cell preservation or culturing arrangement (20) comprises a chamber defining a fluid retaining space (30) for retaining in use a body of fluid (34) and a deformable membrane (36) in communication with the fluid retaining space, and being manipulable by an electroactive polymer actuator arrangement (38) to undergo a defined topology change to induce in the fluid a pattern of fluid flow by which fluid is exchanged between a sub-region (46) immediately proximal the deformable membrane and a sub-region (48) removed from the deformable membrane.