3D Micro-Recess Cell Culture Structure for Single-Cell Gene Delivery
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Solution Overview
Problem
Existing two-dimensional cell culture methods lead to uneven nutrient distribution, cell stacking, and poor cell viability, with inadequate single cell separation and recovery, and inefficient gene delivery.
Innovation Solution
A cell culture structure with micro recesses and nano structures on a substrate, forming a three-dimensional culture space that accommodates single cells, enhanced by a biocompatible polymer film and through-holes, and a cell culture device with electrodes for precise electric field application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two-dimensional plane culture is used, then cell culture simplicity is maintained, but cell proliferation uniformity and nutrient distribution deteriorate
Solution Approach 1:
The patent transitions from two-dimensional plane culture to three-dimensional micro-recess culture by fabricating arrays of micro-recesses on the substrate surface. Each micro-recess has a defined depth and width, creating a 3D confined space that improves nutrient distribution and cell proliferation uniformity while maintaining cultural control
Solution Approach 2:
The culture substrate is segmented into multiple independent micro-recesses, each capable of accommodating individual cells or small cell groups. This segmentation isolates cells into discrete units, ensuring uniform nutrient access and preventing stacking, thereby improving proliferation consistency across the culture surface
2Productivity
If micro-structured substrates are used, then cell attachment efficiency is improved, but single cell separation and recovery convenience deteriorate
Solution Approach 1:
The patent optimizes specific geometric parameters of the micro-recesses, including depth (5-50 μm), width (10-100 μm), and aspect ratio, to achieve optimal cell attachment while enabling easy recovery. The controlled dimensions ensure cells attach efficiently to the structured surface yet can be released uniformly through enzymatic or mechanical treatment
Solution Approach 2:
The substrate exhibits different local properties: the micro-recess regions provide high cell attachment through 3D confinement and increased surface area, while the inter-recess areas maintain smooth topology for fluid flow and cell access. This local differentiation enables both efficient attachment and convenient recovery operations
3Productivity
If conventional electroporation is used, then gene delivery is achieved, but cell damage and non-uniform transfection deteriorate
Solution Approach 1:
The micro-recess structure creates localized electric field concentration at the recess tips where cells are positioned. This local field enhancement enables effective gene delivery at lower overall voltages, reducing cell damage while maintaining uniform transfection across the cell population through consistent positioning within each recess
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
The structure effectively partitions single cells, improves cell viability, and enhances gene delivery efficiency by concentrating electric fields, achieving high survival rates and uniform gene introduction.
Implementation Method 1
The nano structure includes a plurality of nano pillars formed on the inclined sidewall... forming a nano-scale pillar structure layer that surrounds toward an inner side of the micro recess
Implementation Method 2
a cell culture device with electrodes for precise electric field application... enhances gene delivery efficiency by concentrating electric fields
Data Source
AI summary
A cell culture structure and a cell culture device are provided. The cell culture structure includes a substrate having a top surface and a bottom surface. A plurality of micro recesses are recessed from the top surface toward the bottom surface of the substrate, in which a recess width of each of the micro recesses decreases from the top surface toward the bottom surface to form an inclined sidewall. The inclined sidewall of each of the micro recesses is formed with a nano structure conforming to and covering a three-dimensional contour of the corresponding micro recess. Each of the micro recesses and the corresponding nano structure collectively form a three-dimensional culture space.