Reusable Microfluidic Devices with Polymer Bonding
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Solution Overview
Problem
Conventional microfluidic devices are single-use and disposable, leading to excessive waste and contamination issues, which contradict sustainability principles.
Innovation Solution
Design of microfluidic devices with reusable components such as pumps, electrodes, and impedance probes, where substrates with attached components are removably coupled using a polymer bonding layer, allowing for detachment and reuse after cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microfluidic devices are made single-use and disposable, then contamination is reduced and ease of operation is improved, but waste increases and sustainability deteriorates
Solution Approach 1:
The microfluidic device is divided into separable components: a reusable substrate containing expensive components (electrodes, actuators, sensors) and a disposable cartridge containing the microfluidic channel. This segmentation allows the reusable part to be cleaned and reused multiple times while only the disposable cartridge is discarded, reducing waste while maintaining contamination control.
Solution Approach 2:
The invention implements a system where the disposable cartridge is discarded after single use to maintain contamination control, while the reusable substrate is recovered, cleaned, and reused. This selective discarding and recovering approach reduces overall waste compared to complete single-use devices while ensuring contamination control is maintained.
2Loss of substance
If microfluidic devices are made reusable, then waste is reduced and sustainability is improved, but contamination risk increases and reliability deteriorates
Solution Approach 1:
By segmenting the device into reusable and disposable portions, the invention allows the reusable substrate to be cleaned and sterilized between uses, maintaining contamination control while enabling reuse. The disposable cartridge ensures that critical fluid-contact components are replaced, preventing cross-contamination.
Solution Approach 2:
The reusable substrate is recovered and subjected to cleaning and sterilization processes, while the disposable cartridge is discarded. This approach enables sustainability through reuse of expensive components while maintaining reliability through proper disposal of potentially contaminated elements.
3Reliability
If complete microfluidic devices are made disposable, then contamination control is improved, but manufacturing cost increases and loss of substance worsens
Solution Approach 1:
The device is segmented into a permanent reusable substrate and a temporary disposable cartridge. Only the cartridge portion is manufactured as a complete disposable unit, while the substrate is manufactured once and reused. This reduces the total quantity of materials consumed compared to complete disposable devices.
Solution Approach 2:
The reusable substrate is recovered after each use cycle, cleaned, and reused, reducing material waste. Only the disposable cartridge is discarded, minimizing the quantity of substance lost while maintaining contamination control through selective disposal of fluid-contact components.
4Strength
If substrates are permanently bonded, then device stability and strength are improved, but reusability deteriorates and adaptability worsens
Solution Approach 1:
The bonding system transitions from permanent to dynamic/reversible. The reusable substrate uses permanent bonding for structural components requiring stability, while the cartridge attachment uses reversible bonding that allows repeated attachment and detachment cycles. This dynamic bonding approach maintains strength where needed while enabling reusability.
Solution Approach 2:
Different bonding methods are applied to different portions of the device: permanent bonding for the substrate structure requiring strength and stability, and reversible bonding for the cartridge interface requiring adaptability and reusability. This segmented bonding strategy resolves the contradiction between strength and versatility.
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 reliable cell or particle capture, localization, and analysis while reducing waste and extending the life cycle of microfluidic components, promoting sustainability by allowing multiple uses of the reusable parts.
Implementation Method 1
a bonding layer (e.g., a polymer) adapted to removably couple the first and second substrates
Implementation Method 2
a set of piezoelectric actuators coupled to the support and configured to adjust positioning of the support
Implementation Method 3
a set of electrodes (e.g., to detect sample properties) coupled to the second substrate
Data Source
AI summary
An example microfluidic device includes a first substrate, a second substrate, a set of electrodes, a set of piezoelectric components, a support, a set of piezoelectric actuators coupled to the support, and a polymer component. In the example device, the set of electrodes and the set of piezoelectric components are coupled to a surface of the second substrate. The support is configured to support at least one of the first substrate and the second substrate. The set of piezoelectric actuators is configured to adjust positioning of the support. The polymer is adapted to removably couple the first and second substrates such that a microfluidic channel is formed between the first and second substrates while the first and second substrates are coupled by the polymer.