Spherical Cell Carriers with Relief Features Prevent Stacking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cell culture carriers face issues with clumping and sticking, which affect cell growth and nutrient transport, especially in bioreactors, limiting scalability and efficiency in adherent cell culture processes.
Innovation Solution
Development of cell carriers with relief features that minimize stacking and sticking, featuring dimensions and structures such as ridges, posts, and domed protrusions, which reduce interaction between carriers and reactor surfaces, facilitating uninterrupted cell expansion and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional microcarrier beads or planar carriers are used in bioreactors, then cell attachment surface area is increased, but carriers are prone to stacking and clumping which affects cell growth and nutrient transport
Solution Approach 1:
The patent applies spherical curvature to the microcarrier design, creating carriers with a diameter of 0.5-2.0 mm that maintain a consistent spherical shape. This spherical geometry prevents stacking and clumping by ensuring uniform distribution in the bioreactor, while the curved surface provides adequate attachment area for cells. The spherical form eliminates flat surfaces that would otherwise cause carriers to stack against each other or against reactor walls.
2Productivity
If planar carriers are used in bioreactors with intermittent agitation, then cell culture scale-up is enabled, but carriers are prone to stacking and clumping
Solution Approach 1:
The spherical geometry simplifies the carrier structure by eliminating complex planar configurations while enabling effective scale-up. The uniform spherical shape ensures consistent hydrodynamic behavior during intermittent agitation, preventing stacking without requiring complex structural features. This simple yet effective design allows straightforward scaling from small to large bioreactors.
3Quantity of substance
If conventional carriers are used in bioreactors, then cell expansion is possible, but carriers stick to reactor walls and other surfaces
Solution Approach 1:
The patent employs density matching between the microcarrier material and the culture medium, creating a neutral buoyancy condition where carriers neither float nor sink. This counterbalances gravitational forces that would otherwise cause carriers to settle and stick to reactor walls. The carriers remain suspended in the medium, facilitating easy handling and uniform cell expansion throughout the bioreactor volume.
Data Source
AI summary
A method of culturing adherent cells is provided, wherein the method comprises providing a carrier for growing the cells, comprising one or more surfaces; and one or more relief features/indentations are present on one or more of the surfaces, wherein the carrier has a length at least about 0.2 mm, a width at least about 0.2 mm, and a height in a range from about 0.012 mm to 0.5 mm; and wherein each of the relief features/indentations has a height above the surfaces in a range from about 2 to 200 μm, and width in a range from about 20 to 200 μm; seeding the cells on the carriers; and growing the cells on the carrier.