Hexagonal Microwell Array for Digital PCR Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing digital PCR chips face challenges in improving sensitivity and reducing detection limits, primarily due to limitations in the volume and arrangement of reaction chambers on the chip.
Innovation Solution
The proposed microwell array chip features a substrate with an array of reaction chambers and a virtual idle region, where the reaction chambers are configured to accommodate samples and the idle region is divided into virtual units, optimizing the chip's area utilization to increase reaction chamber volume and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of reaction chambers is increased to improve detection accuracy, then the sensitivity is improved, but the volume of each reaction chamber decreases
Solution Approach 1:
The patent transitions from a traditional grid arrangement to a hexagonal close-packed arrangement, utilizing geometric optimization in the two-dimensional plane to maximize space utilization. This dimensional optimization allows more reaction chambers to be packed while maintaining adequate volume, resolving the contradiction between increasing chamber count for detection accuracy and maintaining sufficient chamber volume.
Solution Approach 2:
The patent changes the geometric parameters of the reaction chamber arrangement by adopting a hexagonal pattern with specific pitch and offset relationships. By optimizing the pitch parameter (distance between adjacent chambers) and using non-integer row offsets, the design achieves denser packing while maintaining functional chamber volumes, thus improving detection accuracy without excessively reducing individual chamber volume.
2Measurement precision
If the reaction chambers are arranged densely to increase the number of chambers, then the detection sensitivity is improved, but the chip area utilization is reduced
Solution Approach 1:
The patent segments the chip area into reaction chamber regions and idle regions, with the idle region divided into virtual units that match the shape and size of reaction chamber projections. This segmentation allows precise calculation and optimization of area utilization, enabling dense chamber arrangement while systematically managing the remaining space to achieve high chip area utilization.
Solution Approach 2:
By adopting a hexagonal close-packed arrangement instead of a conventional rectangular grid, the patent achieves superior two-dimensional space utilization. The hexagonal geometry allows chambers to be packed more efficiently in the plane, increasing the number of chambers per unit area and improving both detection sensitivity and chip area utilization simultaneously.
3Measurement precision
If the reaction chamber volume is increased to improve sensitivity, then the detection limit is reduced, but the number of reaction chambers on the chip decreases
Solution Approach 1:
The patent optimizes the pitch parameter and employs non-integer row offsets in the hexagonal arrangement to maximize the number of chambers that can be packed onto the chip. By carefully tuning these geometric parameters, the design achieves a optimal balance where each chamber maintains sufficient volume for high sensitivity detection while the overall chip accommodates a large total number of chambers for high productivity.
Data Source
AI summary
A microwell array chip, a use method therefor, and a detection apparatus. The microwell array chip includes a microwell array substrate, and the microwell array substrate includes n reaction chambers, and an idle region; an array of the n reaction chambers is disposed in the microwell array substrate, and the idle region is disposed around the n reaction chambers; each reaction chamber is configured to accommodate a sample to be tested, and the shape of an orthographic projection of the reaction chamber on a first reference plane where the first main surface is located is of a regular N-gon; the area of the idle region is divided into n′ virtual units, and the shape of the orthographic projection of each virtual unit on the first reference plane is the same as the shape of the orthographic projection of the reaction chamber on the first reference plane.