Photomask-Based Micro-Isolation of Cellular Material
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Solution Overview
Problem
The isolation of microscale components, particularly cancerous cells from non-cancerous cells, is challenging due to the difficulty in differentially analyzing their properties, which is crucial for understanding cellular behavior and biochemical activities.
Innovation Solution
The development of micro-isolation apparatuses and methods using photomasks and photosensitive materials to selectively expose or protect regions of interest on cellular material, allowing for precise micro-isolation and analysis of cellular components through microfluidic devices and lithographic patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If photomask blocking region is positioned to correspond to region of interest, then damage to cellular material in region of interest is minimized, but isolation precision and selectivity are reduced
Solution Approach 1:
The photomask is divided into two distinct regions: a transparent region that allows light transmission for damaging cellular material, and a non-transparent blocking region that protects the region of interest. This segmentation enables simultaneous achievement of selective protection and precise isolation by spatially separating the functional zones on the photomask.
Solution Approach 2:
Different regions of the photomask are assigned different optical properties (transparent vs. non-transparent) to fulfill different functions. The blocking region provides protection with high precision positioning over the region of interest, while the transparent region enables bulk material damage. This local differentiation of properties resolves the contradiction between protection and precision.
2Ease of operation
If photosensitive material is deposited on cellular material, then access wells can be formed for microfluidic access, but complexity of the apparatus increases
Solution Approach 1:
A photosensitive material layer is introduced as an intermediary between the cellular material and the microfluidic device. This intermediate layer can be selectively removed through photolithography to create access wells, enabling microfluidic access without directly modifying the cellular material or the microfluidic device structure. The intermediary simplifies the overall process by providing a removable interface layer.
3Manufacturing precision
If photomask blocking region covers portion of transparent region, then selectivity for region of interest is improved, but light transmission and illumination efficiency are reduced
Solution Approach 1:
The photomask is segmented into transparent and non-transparent regions, with the blocking region strategically positioned to cover only the area corresponding to the region of interest. This segmentation ensures that light transmission is maintained in all areas except where protection is required, maximizing overall illumination efficiency while achieving the necessary selectivity.
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 the selective and precise isolation of cellular material, minimizing damage to regions of interest while allowing for biochemical analysis and subsequent applications such as DNA sequencing and protein analysis, enhancing the purity and value of specimens for downstream applications.
Implementation Method 1
a photomask comprising a transparent region and a non-transparent blocking region, the non-transparent blocking region covering at least a portion of the transparent region, wherein the photomask is placed over the cellular material such that the blocking region is positioned to correspond to a region of interest of the cellular material to minimize damage to the cellular material in the region of interest by illumination
Implementation Method 2
depositing a photosensitive material on the cellular material, exposing the photosensitive material to photons in order to generate a lithographic pattern on the photosensitive material
Data Source
AI summary
Provided herein are devices and methods for the micro-isolation of biological cellular material. A micro-isolation apparatus described can comprise a photomask that protects regions of interest against DNA-destroying illumination. The micro-isolation apparatus can further comprise photosensitive material defining access wells following illumination and subsequent developing of the photosensitive material. The micro-isolation apparatus can further comprise a chambered microfluidic device comprising channels providing access to wells defined in photosensitive material. The micro-isolation apparatus can comprise a chambered microfluidic device without access wells defined in photosensitive material where valves control the flow of gases or liquids through the channels of the microfluidic device. Also included are methods for selectively isolating cellular material using the apparatuses described herein, as are methods for biochemical analysis of individual regions of interest of cellular material using the devices described herein. Further included are methods of making masking arrays useful for the methods described herein.