Glaucoma Implant Valve with Thermomechanical Flap
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Solution Overview
Problem
Current glaucoma drainage implants without valves risk postoperative hypotonia due to incomplete pressure closure, while implants with valves, like the Ahmed implant, show no significant long-term benefits over trabeculectomy, and are prone to fibrovascular encapsulation leading to clogging and increased intraocular pressure.
Innovation Solution
A glaucoma drainage implant with a pressure relief valve featuring a movably connected pressure relief flap, utilizing a thermomechanically active area, such as a shape-memory material, to non-invasively mobilize the flap and prevent fibrotic encapsulation, allowing for controlled drainage of aqueous humor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve is added to prevent postoperative hypotonia, then pressure control is improved, but fibrovascular encapsulation and clogging occur
Solution Approach 1:
The pressure relief flap is designed to be movable rather than fixed, allowing it to dynamically respond to pressure changes. The flap can open when intraocular pressure exceeds a threshold and close when pressure is normalized, providing adaptive pressure control that reduces fibrotic response compared to fixed valves
Solution Approach 2:
The flap's position and opening area are changed based on pressure parameters. When pressure increases, the flap opens to a degree proportional to the pressure excess, allowing controlled drainage that prevents both hypotonia and fibrotic encapsulation
2Reliability
If cytotoxins are used to prevent fibrotic encapsulation, then drainage functionality is improved, but risk of sterile endophthalmitis increases
Solution Approach 1:
The invention replaces chemical prevention methods (cytotoxins) with a mechanical solution - a movable pressure relief flap that physically prevents fibrotic encapsulation through its movement mechanism, eliminating the need for cytotoxic agents and their associated risks
3Reliability
If the pressure relief flap is made fixed to ensure closure, then pressure control is improved, but long-term functionality deteriorates due to encapsulation
Solution Approach 1:
The pressure relief flap transitions from a fixed structure to a dynamic, movable component that can open and close based on pressure conditions, ensuring long-term functionality by preventing fibrotic encapsulation while maintaining pressure 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 effectively reduces the risk of fibrotic encapsulation and hypotonia, maintaining long-term drainage functionality without the need for cytotoxins like mitomycin C, and allows for controlled regulation of intraocular pressure, enhancing the implant's long-term outcomes compared to prior art.
Implementation Method 1
the actuation area has a thermomechanically active area, which allows the pressure relief flap to be mobilized non-invasively by a change in temperature. The actuation area is preferably provided in the form of a shape-memory material or includes such a material.
Data Source
AI summary
A glaucoma drainage implant comprising a pressure relief valve via which aqueous humor can be drained. The pressure relief valve has a pressure relief flap which is movably connected with a base plate of the implant, which is to be embedded in a sclera, wherein the pressure relief flap has an actuation area by means of which the pressure relief flap can be mobilized non-invasively during a post-operative healing phase or thereafter. The actuation area is preferably designed as a thermomechanically active area.