Chip Heat Sink Structure for Electromagnet Cooling in POCT Extraction
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Solution Overview
Problem
The generation of excessive heat by electromagnets in chip-type POCT nucleic acid extractors due to joule heating affects nucleic acid extraction efficiency and damages instruments and chips.
Innovation Solution
A chip heat sink with a substrate and heat dissipation structure that accommodates the electromagnet, featuring grooves and thermally conductive materials to dissipate heat, and optionally includes fins, fans, and cooling channels to control the electromagnet's temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnet is powered on to control fluid flow, then the fluid channel is blocked, but excessive heat is generated affecting nucleic acid extraction
Solution Approach 1:
The patent extracts the heat dissipation function from the electromagnet itself and implements it through a separate heat dissipation structure (heat sink) with fins and cooling channels. This separates the fluid control function of the electromagnet from its heat management, allowing the electromagnet to perform its blocking function reliably while the heat sink handles temperature control to prevent overheating during nucleic acid extraction.
2Ease of operation
If the electromagnet generates heat for a certain period, then the fluid channel is effectively blocked, but the temperature reaches 90°C or above damaging instruments and chips
Solution Approach 1:
The patent introduces a heat dissipation structure as an intermediary between the electromagnet and the surrounding environment (including the chip and instruments). This heat sink with its fins and cooling channels acts as a thermal mediator that absorbs excess heat from the electromagnet during fluid blocking operations, preventing temperature from reaching damaging levels (90°C or above) while maintaining effective fluid control.
3Reliability
If the electromagnet is continuously powered to maintain fluid blockage, then the channel remains closed, but heat accumulation affects nucleic acid extraction efficiency
Solution Approach 1:
The patent extracts the heat management burden from the nucleic acid extraction process by implementing a dedicated heat dissipation structure. This allows the electromagnet to be continuously powered for reliable channel closure during extraction, while the heat sink with fins and cooling channels separately handles heat removal, preventing temperature accumulation that would otherwise degrade nucleic acid extraction efficiency.
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
Effectively cools the electromagnet, preventing temperature-induced damage and ensuring the nucleic acid extraction process operates within required temperature ranges, such as PCR and LAMP, without harming the equipment or chip.
Implementation Method 1
the electromagnet generates heat when being powered on due to the joule heat effect
Implementation Method 2
a thermally conductive material is filled in the space
Implementation Method 3
a fan arranged on a side of the plurality of fins away from the substrate and for blowing air to the plurality of fins
Data Source
AI summary
A chip heat sink for a chip and a nucleic acid extraction device, where the chip has a channel for conveying a fluid, and on/off of the channel is controlled by an solenoid valve, the chip heat sink includes: a substrate, where the substrate has a first surface for placing the chip, and the first surface is provided with a first accommodating groove for accommodating an electromagnet; and a heat dissipation structure on the substrate and for dissipating heat from the electromagnet.