Pressure Valve Glaucoma Drainage Device
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Solution Overview
Problem
Conventional glaucoma treatments, such as trabeculectomy, face complications like ocular hypotension, scarring of the filtering bleb, and increased intraocular pressure, leading to surgical failure, especially in refractory glaucoma cases where traditional methods struggle to control intraocular pressure effectively.
Innovation Solution
A glaucoma aqueous humor drainage device featuring a pressure valve connected to internal and external drainage catheters, with the external catheter having through holes and a semi-permeable membrane, designed to drain aqueous humor to the ocular surface when intraocular pressure exceeds a threshold, reducing scarring and operation failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trabeculectomy is performed to drain aqueous humor, then intraocular pressure is reduced, but scarring of the filtering bleb occurs leading to surgical failure
Solution Approach 1:
The patent introduces a drainage valve as an intermediary device between the anterior chamber and the external environment. The valve body with its pressure-sensitive opening mechanism mediates the drainage process, allowing controlled aqueous humor flow while preventing the uncontrolled scarring associated with traditional filtering bleb formation. The valve acts as a mediator that separates the internal drainage function from the external conjunctival tissue response.
Solution Approach 2:
The patent changes the pressure parameter control mechanism from passive filtering bleb formation to active pressure-sensitive valve opening. The valve opening pressure is set at 8-15 mmHg, providing precise control over when drainage occurs. This parameter change transforms the uncontrolled scarring process into a controlled pressure-regulated drainage system that maintains reliability over time.
2Productivity
If drainage disc is embedded under conjunctiva, then aqueous humor drainage is achieved, but fibrous tissue proliferation and encapsulated bleb formation occur preventing aqueous humor spreading
Solution Approach 1:
The patent extracts the drainage function from the conjunctival tissue plane and relocates it to a pressure-sensitive valve mechanism. Instead of embedding the drainage disc under the conjunctiva where it provokes fibrous tissue response, the valve is positioned to drain through a controlled opening in the corneoscleral wall. This extraction removes the harmful interaction between the drainage device and the conjunctival healing response.
Solution Approach 2:
The patent creates a simplified model of aqueous humor drainage by using a pressure-sensitive valve that replicates the natural pressure-regulated flow without requiring complex conjunctival flap construction. The valve body with its pressure-sensitive opening provides a copied drainage function that is more reliable and less prone to fibrous encapsulation than the traditional filtering bleb model.
3Reliability
If conventional trabeculectomy is used for refractory glaucoma, then initial drainage is achieved, but scarring increases over time causing late-stage surgical failure
Solution Approach 1:
The patent introduces dynamic pressure-sensitive control to the drainage system. The valve opening pressure of 8-15 mmHg allows the system to adapt to changing intraocular pressure conditions over time. This dynamic response maintains reliable drainage functionality longer than static filtering blebs, which become scarred and non-functional. The pressure-sensitive mechanism ensures drainage occurs when needed while protecting against over-drainage complications.
Solution Approach 2:
The patent performs preliminary action by creating a controlled opening in the corneoscleral wall before implanting the valve, rather than relying on subsequent filtering bleb formation. The valve is pre-positioned with its pressure-sensitive opening mechanism ready to function immediately, preventing the progressive scarring that plagues late-stage filtering bleb failure. This preliminary structured approach ensures long-term functionality.
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 device effectively reduces intraocular pressure and minimizes scarring by controlled drainage of aqueous humor, improving treatment success rates for glaucoma patients and reducing patient discomfort and dry eyes.
Implementation Method 1
the pressure valve is connected with an internal drainage catheter for draining anterior chamber aqueous humor into a cavity within the pressure valve and an external drainage catheter for draining the anterior chamber aqueous humor in the cavity of the pressure valve to the ocular surface upon the pressure valve reaching a threshold value
Implementation Method 2
The inner tube wall of the external drainage catheter is also covered with a semi-permeable membrane material
Data Source
AI summary
A glaucoma aqueous humor drainage device and a glaucoma aqueous humor drainage method, wherein the opening and closing of a pressure valve is controlled by the change in the pressure in a cavity of the valve. When the pressure in the intraocular pressure exceeds 12 mmHg, the valve is opened, and a drainage tube connected behind the valve drains the aqueous humor to the ocular surface, reducing the patient's discomfort and dry eyes, effectively draining the aqueous humor and avoiding scarring caused by embedding the device via a conjunctival flap and operation failure caused by increase of intraocular pressure caused by generation of filtering blebs.