Digital Microfluidics Cartridge Compressible Membrane Liquid Loading
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Solution Overview
Problem
Loading reagents and liquids into digital microfluidics (DMF) cartridges is a challenging step due to the need for precise handling and sealing, which existing methods fail to address effectively.
Innovation Solution
A DMF cartridge design incorporating a top and bottom substrate with piercer features and a compressible membrane layer, where the membrane is compressed to force liquids through hollow needles into the droplet operations gap, allowing for efficient liquid loading and sealing within the cartridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional liquid loading methods are used in DMF cartridges, then the structure is simpler, but the sealing reliability and prevention of leakage/spillage deteriorates
Solution Approach 1:
The cartridge is divided into separate functional modules: a well plate portion containing liquid reservoirs, a DMF portion containing electrodes and substrates, and a compressible membrane layer that acts as a seal. This segmentation allows each module to be optimized independently while maintaining overall sealing reliability through the membrane interface.
Solution Approach 2:
The compressible membrane layer serves as an intermediary element between the well plate portion and the DMF portion. It provides a reliable seal while allowing controlled liquid transfer through hollow needle piercer features, preventing leakage and spillage without requiring complex mechanical sealing mechanisms.
2Manufacturing precision
If manual liquid loading is performed, then the device complexity is reduced, but the precision and control of liquid dispensing deteriorates
Solution Approach 1:
The system enables self-service liquid dispensing where the compressible membrane layer automatically controls liquid flow from the well plate to the DMF cartridge through the hollow needle piercer features. The membrane's compression and relaxation cycles provide precise, repeatable liquid transfer without requiring external manual intervention or complex pumping mechanisms.
Solution Approach 2:
The compressible membrane layer introduces dynamic control to the liquid loading process. By applying varying compression forces, the system can precisely control when and how liquid is dispensed through the hollow needles, achieving high dispensing precision while keeping the mechanical structure relatively simple.
3Productivity
If the membrane is compressed to force liquid through hollow needles, then the liquid loading efficiency is improved, but the risk of leakage or spillage increases
Solution Approach 1:
The compressible membrane layer is implemented as a flexible thin film structure that can be compressed to force liquid through hollow needle piercer features. The flexible nature of the membrane allows it to conform to the cartridge structure and maintain seals, while controlled compression enables efficient liquid loading without creating excessive pressure that could cause leakage or spillage.
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 solution enables efficient and airtight loading of liquids into the DMF cartridges, simplifying the process and reducing the risk of leakage or spillage, while maintaining an airtight environment for further processing.
Implementation Method 1
compression of the flexible membrane towards the interior of the well forces a liquid from the interior of the well through the hollow needle, and into the droplet operations gap
Data Source
AI summary
A cartridge with (a) a top substrate and a bottom substrate separated to form a droplet operations gap, the top substrate comprising a well plate comprising an array of wells each well comprising a hollow needle liquidly connecting an interior of the well with the droplet operations gap; and (b) a compressible membrane layer atop the well plate sealing the reservoirs and arranged so that compression of the flexible membrane towards the interior of the well forces a liquid from the interior of the well through the hollow needle, and into the droplet operations gap.