Selectable IOP Valve with Parallel Flow Pathways
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Solution Overview
Problem
Current glaucoma treatments, such as drainage devices, lack smart and interactive control over aqueous humor flow, leading to increased flow resistance due to fibrosis at the drainage site, which reduces their effectiveness in managing intraocular pressure (IOP).
Innovation Solution
A selectable IOP valve system with multiple parallel flow control pathways and pressure sensors that adjust drainage flow based on pressure differentials between the anterior chamber and drainage location, using a microprocessor to control valve operation and maintain optimal IOP and bleb pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive drainage device is implanted to relieve intraocular pressure, then IOP control is achieved initially, but flow resistance increases over time due to fibrosis at the drainage site
Solution Approach 1:
The patent implements a controllable valve mechanism that dynamically adjusts the opening degree based on real-time pressure feedback from sensors. This allows the system to adapt to changing flow resistance conditions caused by fibrosis, maintaining optimal flow rates by opening the valve wider when resistance increases, thereby resolving the contradiction between initial effectiveness and long-term productivity.
Solution Approach 2:
The system incorporates pressure sensors that continuously monitor IOP and drainage site pressure, feeding this information to a controller that adjusts valve opening accordingly. This closed-loop feedback mechanism compensates for increasing flow resistance due to fibrosis, maintaining reliable IOP control despite deteriorating drainage conditions over time.
2Reliability
If drainage flow is increased to maintain IOP control, then pressure regulation improves, but fibrosis and bleb complications increase
Solution Approach 1:
By implementing closed-loop pressure feedback control, the system maintains pressure regulation within target ranges without requiring excessive flow rates. The valve opens only as much as necessary to achieve target IOP, minimizing unnecessary high flow that would accelerate fibrosis and bleb complications, thus resolving the contradiction between reliable pressure regulation and harmful side effects.
Solution Approach 2:
The system dynamically changes the valve opening parameter based on real-time pressure conditions, allowing precise control of flow rates. This enables maintenance of optimal pressure regulation while avoiding sustained high flow rates that cause fibrosis and bleb complications, effectively resolving the contradiction through adaptive parameter adjustment.
3Device complexity
If a single flow control pathway is used, then device complexity is reduced, but adaptability to changing pressure conditions deteriorates
Solution Approach 1:
The patent divides the flow control into multiple independent pathways, each with its own valve and pressure sensor. This segmentation allows the system to selectively open specific pathways based on pressure conditions, providing adaptability to different pressure scenarios while keeping each individual pathway relatively simple in structure.
Solution Approach 2:
The multiple flow control pathways are designed to work together as a unified system that can respond to various pressure differential conditions. Each pathway serves multiple functions: individual flow control, pressure sensing, and collective adaptability to changing IOP conditions, resolving the contradiction between simplicity and versatility.
Data Source
AI summary
A selectable IOP valve for implantation in an eye of a patient controls IOP and/or bleb pressure. The valve includes a drainage tube configured to convey aqueous from an anterior chamber of an eye and includes a selectable flow control valve in fluid communication with the drainage tube and configured to control flow rates of the aqueous. The valve system includes a plurality of flow control pathways arranged to operate in parallel with each other, each of the flow control pathways being in communication with an entry port to the valve system. A flow control mechanism controls aqueous flow through the pathways. Methods and systems are also disclosed.