Cell Culture Microwells with Rounded Tips for Uniform Spheroids
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Solution Overview
Problem
Current cell culture apparatuses, such as the hanging drop method and existing commercial devices, are limited in their ability to produce large-scale cell clusters of uniform size with controlled medium exchange, leading to inefficient stem cell differentiation and increased risk of uncontrolled cell growth and tumor formation due to irregular microwell shapes and inadequate nutrient distribution.
Innovation Solution
A cell culture apparatus with a compartmentalized design featuring microwells of uniform volume and shape, arranged to cover the entire base area with inclined surfaces, preventing cells from settling outside the wells and promoting the formation of uniform cell spheroids through rounded edges and angles that facilitate natural communication and growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If microwells with inverted pyramid shape or flat-bottom pyramid are used, then cell aggregation can be achieved, but cells are forced into pointed pyramid shape instead of round spheroid shape
Solution Approach 1:
The microwells are designed with a rounded bottom instead of a pointed or flat bottom, allowing cells to aggregate naturally into spherical spheroid shapes. This curvature principle enables cells to form their natural round conformation rather than being forced into artificial pyramid shapes, resolving the contradiction between achieving cell aggregation and maintaining natural cell shape.
2Ease of manufacture
If microwells do not cover entire base area with horizontal edges remaining, then manufacturing is simplified, but individual cells can deposit on edges and grow uncontrolled
Solution Approach 1:
The microwells are designed with rounded bottoms and sides that completely cover the base area, eliminating horizontal edges where cells could deposit uncontrolled. The curved surfaces guide all cells into the microwells, ensuring controlled growth while maintaining manufacturing feasibility through complete base coverage.
3Productivity
If hanging drop method is used, then cell clusters can be formed, but only limited number of clusters can be generated and limited medium changes can be carried out
Solution Approach 1:
The culture system is segmented into multiple independent microwells within a single plate, allowing simultaneous generation of many cell clusters (up to 384 or more). Each microwell functions as an independent culture unit, enabling high-throughput production while maintaining the ability to perform medium changes across all wells through the plate's fluid access design.
Solution Approach 2:
The microwell plate design combines multiple functions: it serves as both the culture container for generating numerous cell clusters and as a platform that enables medium exchange through standard plate interfaces. This multi-functionality resolves the limitation of the hanging drop method which could only perform one function at a time.
4Productivity
If pyramid-shaped microwells with sharp edges are used, then cell aggregation occurs, but natural communication mechanisms of cells are prevented due to irregular shapes
Solution Approach 1:
The rounded microwell design creates uniform, spherical cell spheroids with consistent geometry throughout. This regular shape ensures uniform distribution of oxygen and signal molecules within each spheroid, maintaining natural cell communication mechanisms while still achieving efficient cell aggregation. The curvature eliminates the sharp edges and irregularities that would disrupt signal paths.
Data Source
AI summary
The invention relates to a cell culture apparatus for cultivating cell spheroids, comprising at least one compartment having n compartment walls which define a compartment base area and a volume VK above the compartment base area and a multiplicity of microwells having p top edges and a volume VM, wherein the microwells are arranged in the compartment base area such that the compartment base area outside the microwells merely has inclined surfaces, the number of microwells is chosen such that the entire compartment base area is covered with microwells, all the microwells have the same volume VM and the microwells have the shape of a pyramid or a cone having a rounded tip for accommodation of cells and additionally rounded edges between the tip and the base of the pyramid or the cone.