Multilayer Membrane Actuator for IOP Control
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Solution Overview
Problem
Existing IOP control systems using electrolysis-based membrane valves face issues with gas imbalance due to unequal diffusion rates of gases, requiring continuous power to maintain desired membrane deflection and fluid flow control.
Innovation Solution
A multilayer membrane actuator is introduced, comprising layers with varying permeability and flexibility to slow or prevent gas escape, maintaining a balanced gas molecular ratio and reducing the need for constant power by incorporating a diffusion barrier and regulating layer to control fluid flow through the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-layer membrane is used in electrolysis-based membrane valves, then the membrane flexibility and responsiveness to pressure differentials are improved, but gas molecules diffuse through the membrane causing gas imbalance and requiring continuous power supply
Solution Approach 1:
The membrane is divided into multiple layers with distinct functions: a flexible support layer provides mechanical responsiveness, while a separate gas-impermeable layer prevents gas diffusion. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between membrane flexibility and gas retention.
Solution Approach 2:
The invention uses a composite membrane structure combining materials with different properties - one material providing flexibility and another providing gas impermeability. This composite approach enables the membrane to simultaneously achieve mechanical responsiveness and prevent gas loss, eliminating the need for continuous power supply to maintain gas balance.
2Device complexity
If gas is allowed to diffuse through the membrane to maintain pressure balance, then membrane deflection control is simplified, but gas imbalance between hydrogen and oxygen occurs requiring constant power compensation
Solution Approach 1:
The membrane structure is segmented into functional layers where the gas-impermeable layer specifically addresses gas retention while the support layer handles mechanical deflection. This segmentation allows the system to maintain gas balance passively through the membrane structure itself, rather than requiring active power compensation mechanisms.
Solution Approach 2:
The gas-impermeable layer acts as an intermediary barrier between the electrolysis chamber and the external environment, selectively preventing gas diffusion while allowing the membrane to respond to pressure differentials. This intermediary layer maintains gas molecular ratio stability without requiring complex active control systems.
3Stability of the object's composition
If the membrane is made more permeable to allow gas exchange, then pressure equalization is improved, but gas loss through the membrane increases causing imbalance
Solution Approach 1:
The membrane is segmented into layers where the gas-impermeable layer completely prevents gas diffusion, while the support layer provides mechanical flexibility. This segmentation allows the system to maintain pressure equilibrium through mechanical deformation rather than gas exchange, eliminating gas loss and the resulting gas imbalance.
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 multilayer membrane actuator enhances the longevity and reliability of IOP control systems by maintaining gas balance, reducing energy requirements and preventing bleb formation, while ensuring consistent fluid drainage.
Implementation Method 1
Gas molecules in membrane valves may diffuse through the membrane. As gas is lost through the membrane, a gas imbalance arises due to the unequal diffusion rates of various gases (e.g., hydrogen and oxygen).
Implementation Method 2
membrane valves utilize deflection of the membrane in response to pressure differentials across the membrane to regulate the flow through the drainage device
Implementation Method 3
IOP control systems or implants that utilize electrolysis-based membrane valves can provide flow control through the drainage device
Data Source
AI summary
An IOP control device for implantation in an eye of a patient is disclosed. The device includes a housing and a multilayer membrane. The housing is sized for implantation into the eye and includes an entrance port and an exit port. The membrane is anchored within the housing to form a flow control chamber on a first side and a fluid flow passageway on a second opposing side of the membrane. The chamber is arranged to contain a gas creating a chamber pressure, and the membrane is configured to affect flow through the passageway from the entrance port to the exit port by deflecting in response to changes in the chamber pressure. The membrane comprises a first layer having a higher permeability and a higher flexibility than the second layer, which is disposed adjacent the first layer and restricts the diffusion of gas in the chamber through the membrane.