Microfluidic Valve Boss Relief for Gas Purging
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Solution Overview
Problem
Existing microfluidic valve systems for ophthalmic treatments, particularly those used in glaucoma management, face challenges in effectively purging air or gas, which can degrade device performance and lead to inaccurate pressure monitoring and control.
Innovation Solution
The development of microfluidic valves with a flexible membrane and a boss structure featuring relief and non-relief portions, allowing pressurized fluid to enter and exit the chamber while preventing gas entrapment, ensuring accurate pressure response and efficient fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microfluidic valve is designed with a flexible membrane and boss structure for implantation in the eye, then the device can accurately monitor and control intraocular pressure, but air or gas may become trapped in the valve chamber, degrading device performance
Solution Approach 1:
The boss structure is segmented into a relief portion and a non-relief portion, creating distinct functional zones. The relief portion allows controlled separation from the membrane to enable gas purging, while the non-relief portion maintains the sealing function. This segmentation resolves the contradiction by providing dedicated pathways for gas removal without compromising the overall valve reliability.
Solution Approach 2:
The valve design incorporates a priming mechanism that allows preliminary flushing of the valve chamber with fluid before normal operation. This preliminary action removes trapped air or gas from the chamber, ensuring the valve is properly primed and preventing gas entrapment that would degrade performance during actual pressure monitoring and control operations.
2Reliability
If the membrane is designed to seal against the entire boss structure, then the valve maintains reliable sealing, but gas becomes trapped and cannot be purged from the chamber
Solution Approach 1:
The boss structure exhibits local quality differentiation through the relief portion and non-relief portion. The relief portion has localized properties that allow membrane separation and gas escape, while the non-relief portion maintains full sealing properties. This local differentiation resolves the contradiction by providing both sealing reliability and gas purging capability in different spatial zones of the same structure.
Solution Approach 2:
The relief portion is extracted as a distinct functional element from the boss structure. This extracted portion specifically handles the gas purging function by allowing membrane separation, while the remaining non-relief portion continues to provide the primary sealing function. This extraction resolves the contradiction by separating the sealing and gas purging functions into distinct structural elements.
3Object-generated harmful factors
If the valve chamber is completely filled with fluid during priming, then gas is purged from the system, but the priming process becomes complex and time-consuming
Solution Approach 1:
The valve design enables self-service gas purging through the integrated relief portion mechanism. During normal operation, pressure differential automatically drives the membrane against the relief portion, creating pathways for gas to escape without requiring external intervention or complex priming procedures. This self-service approach resolves the contradiction by eliminating time-consuming manual priming while effectively removing gas from the system.
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 effective purging of air or gas from the valves, enhancing the accuracy of pressure monitoring and control in intraocular devices, potentially leading to more effective glaucoma treatment and improved patient outcomes.
Implementation Method 1
a pressure required to separate the membrane from the relief portion is less than a pressure require to separate the membrane from the non-relief portion
Implementation Method 2
a flexible membrane and a boss structure featuring relief and non-relief portions, allowing pressurized fluid to enter and exit the chamber
Implementation Method 3
The top edge includes a relief portion and a non-relief portion. The relief portion is structurally arranged so that a pressure required to separate the membrane from the relief portion is less than a pressure require to separate the membrane from the non-relief portion.
Data Source
AI summary
A microfluidic valve for implantation in an eye of a patient is disclosed. The valve may include a chamber formed between a substrate and a flexible membrane. The valve may also include a boss disposed in the chamber and having a top edge in selective contact with the flexible membrane. The top edge includes a relief portion and a non-relief portion, with the relief portion being structurally arranged so that a pressure required to separate the membrane from the relief portion is less than a pressure required to separate the membrane from the non-relief portion. The valve also may include an inlet extending through the boss and the substrate through which fluid enters the chamber and an outlet configured to allow fluid to exit the chamber. Methods for priming a microfluidic valve are also disclosed.