Self-Opening Valve Cartridge for Negative-Pressure Fluid Control
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Solution Overview
Problem
Existing fluidic devices and cartridges face challenges in maintaining a reliable and self-opening valve mechanism that can resist closure under negative pressure, especially in microfluidic and mesofluidic systems, where precise control of fluid flow is crucial for applications like PCR and sample analysis.
Innovation Solution
A fluidic device comprising a substrate with a malleable material and a deformable layer bonded to its surface, forming a valve that is initially depressed in the substrate and retains elasticity to remain open, even under negative pressure, using a ram to close the valve by applying pressure normal to the valve body, ensuring the valve is biased open in its ground state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve mechanism is designed to remain closed under negative pressure, then fluid control reliability is improved, but the valve cannot automatically reopen when pressure equalizes, causing loss of fluid flow control
Solution Approach 1:
The patent inverts the traditional valve design by making the valve body deformable rather than the seal. The deformable valve body is depressed into the substrate to close the valve, and elastic recovery automatically reopens it when pressure equalizes, eliminating the need for complex actuation mechanisms to maintain reliability while enabling automatic reopening.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the valve body by using a deformable material with specific elastic characteristics. The valve body is designed to undergo controlled deformation under pressure and automatically recover its original shape, transitioning between closed and open states based on pressure differential without additional actuation.
2Ease of operation
If a deformable layer is used to create a self-opening valve, then automatic reopening under negative pressure is achieved, but valve closure reliability under positive pressure deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-depressing the deformable valve body into the substrate during the closing phase. This pre-compression ensures the valve maintains a reliable seal under positive pressure before negative pressure conditions occur, allowing the valve to remain closed until the pressure differential reverses and elastic recovery automatically reopens it.
3Manufacturing precision
If the valve body is made rigid for precise positioning, then manufacturing precision is improved, but the valve cannot deform to seal against the substrate, worsening sealing capability
Solution Approach 1:
The patent replaces the rigid valve body with a flexible deformable layer that can conform to the substrate surface. This deformable layer is bonded to the substrate and can be depressed into the fluidic channel to create a seal, combining the precision of substrate-integrated positioning with the sealing capability of flexible materials.
4Reliability
If complex actuation mechanisms are added to maintain valve openness under negative pressure, then valve control reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by designing a valve that automatically responds to pressure differential changes without external actuation. The deformable valve body inherently opens when pressure equalizes and closes when negative pressure is applied, eliminating the need for complex actuation mechanisms while maintaining reliable fluid control.
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 reliable and efficient fluid control in microfluidic systems, allowing for precise manipulation of fluids and reagents, enhancing the performance of applications such as PCR and sample analysis by maintaining valve openness even under negative pressure conditions.
Implementation Method 1
the deformable material covering the at least one valve body retains sufficient elasticity after deformation such that in a ground state the valve is open
Implementation Method 2
using a ram to close the valve by applying pressure normal to the valve body
Data Source
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AI summary
This disclosure provides, among other things, a cartridge comprising: (a) a cartridge body comprising a malleable material and having, disposed on a surface of the body, at least one valve body comprising a valve inlet and a valve outlet, each fluidically connected to a fluidic channel; and (b) a layer comprising a deformable material bonded to a surface of the cartridge body and sealing the at least one valve body at points of attachment, thereby forming at least one valve; wherein the at least one valve body is depressed in the cartridge body relative to the points of attachment and wherein the deformable material covering the at least one valve body retains sufficient elasticity after deformation such that in a ground state the valve is open. Also disclosed is an instrument comprising a cartridge interface and a cartridge as described herein engaged with the cartridge interface.