PCR Well Resistive Sheet for Uniform Thermal Cycling
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Solution Overview
Problem
Current PCR technologies face challenges in achieving uniform heat distribution and bead distribution across the PCR well, leading to irregular thermal cycling and reduced sensitivity in nucleic acid amplification.
Innovation Solution
A PCR testing device with a non-magnetic resistive sheet having a relative magnetic permeability no greater than 1.01 is used, featuring a single unitary opening in the bottom to generate heat and a magnetic structure to attract beads, ensuring uniform thermal cycling and enhanced bead distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional PCR well bottom is used, then the structure is simple, but heat distribution is non-uniform and bead distribution is irregular
Solution Approach 1:
The well bottom is segmented into multiple functional layers: an electrically conductive layer for heat generation, a magnetic layer for bead attraction, and a non-magnetic support structure. This segmentation allows each layer to perform its specific function optimally, achieving uniform heat distribution and bead positioning without compromising overall structural simplicity.
Solution Approach 2:
The well bottom utilizes composite material construction by combining electrically conductive materials (for resistive heating), magnetic materials (for bead attraction), and non-magnetic support materials. This composite approach enables simultaneous achievement of uniform thermal cycling and improved bead distribution while maintaining a relatively simple integrated structure.
2Reliability
If magnetic materials are used in the well bottom, then bead attraction is enhanced, but magnetic interference with PCR process occurs
Solution Approach 1:
Magnetic properties are applied locally only in specific regions of the well bottom where bead attraction is needed, rather than throughout the entire structure. The magnetic layer is positioned strategically to attract beads to the desired locations while minimizing overall magnetic interference with the PCR amplification process.
Solution Approach 2:
A non-magnetic intermediate layer or support structure is introduced between the magnetic components and the PCR reaction environment. This intermediary element allows magnetic bead attraction to occur while preventing direct magnetic interference with the sensitive nucleic acid amplification process, thus maintaining both reliable bead distribution and PCR integrity.
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
This configuration enhances the uniformity of heat distribution and bead exposure, increasing the sensitivity and repeatability of PCR testing by preventing bead accumulation and ensuring a larger proportion of nucleic acids are subjected to thermal cycling.
Implementation Method 1
The resistive sheet is to receive a signal from a signal source to cause the resistive sheet to generate heat
Data Source
AI summary
A device includes at least one well to receive a polymerase chain reaction (PCR) mixture and including a bottom. The bottom includes an electrically resistive sheet which has a relative magnetic permeability no greater than about 1.01, wherein the resistive sheet is to receive a signal from a signal source to cause the resistive sheet to generate heat to form a pulse-controlled amplification, thermal cycling zone in close thermal proximity to the bottom.