Glaucoma Shunt Flow Management via Elastomeric Plate
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Solution Overview
Problem
Current glaucoma treatments, including surgical implants, face challenges such as elevated bleb formation leading to complications like Dellen and inadequate IOP reduction, along with risks of infection and scarring, which necessitate additional surgeries and can be aesthetically and painfully unacceptable.
Innovation Solution
A glaucoma shunt with a pliable silicone plate and drainage tube design featuring a reduced bleb size, optimized fenestration patterns, and selective cell adhesion regions, along with a flow restrictor mechanism to control fluid flow post-implantation, addressing the need for improved bleb management and fluid drainage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a glaucoma implant is attached to drain aqueous fluid, then intraocular pressure is reduced, but the bleb formation becomes elevated causing Dellen and corneal ulcers
Solution Approach 1:
The patent modifies the physical parameters of the drainage tube, specifically reducing its diameter to 0.46mm and length to 15mm, to control the rate of aqueous fluid drainage. This parameter optimization prevents excessive bleb elevation while maintaining adequate IOP reduction, resolving the contradiction between pressure control and complication prevention
Solution Approach 2:
The patent introduces an intermediate structure (the optimized drainage tube with specific dimensions and flow characteristics) between the aqueous humor and the external environment. This intermediary controls the drainage rate and distributes fluid flow more evenly, preventing the concentrated pressure that causes elevated blebs and subsequent corneal complications
2Productivity
If an open drainage tube is used to release fluid, then IOP is reduced quickly, but too much fluid is released too fast which is detrimental to the eye
Solution Approach 1:
The patent carefully selects and optimizes the drainage tube parameters (0.46mm diameter, 15mm length) to achieve the right balance between drainage efficiency and fluid conservation. These parameter changes ensure adequate IOP reduction without excessive fluid loss, resolving the contradiction between productivity and harmful effects
Solution Approach 2:
The patent creates a dynamic drainage system where the flow rate automatically adjusts based on intraocular pressure gradients. The optimized tube dimensions allow the system to self-regulate, providing high drainage when pressure is high but reducing flow as pressure equalizes, preventing detrimental excessive fluid loss
3Ease of operation
If a valve is incorporated in the fluid drain path to regulate flow, then fluid flow is controlled, but the valve clogs later requiring another surgery
Solution Approach 1:
The patent removes the valve component entirely from the drainage system. Instead of using an active flow control mechanism that can clog, the invention relies on the passive flow regulation provided by the optimized tube dimensions and the natural pressure gradients in the eye. This extraction of the problematic valve element eliminates the clogging issue while maintaining adequate flow control
Solution Approach 2:
The patent creates a self-regulating drainage system where the optimized tube dimensions (0.46mm diameter, 15mm length) enable the system to automatically control flow rates based on pressure differentials without requiring mechanical valves. The system self-adjusts to prevent both excessive drainage and clogging, improving reliability while maintaining operational control
4Productivity
If a large plate is used for the implant, then fluid drainage surface area is increased, but the bleb size and height increase causing aesthetic and surgical complications
Solution Approach 1:
The patent optimizes the plate dimensions and drainage tube specifications to achieve efficient fluid drainage with minimal bleb formation. By carefully selecting parameters such as tube diameter (0.46mm) and length (15mm), the system maintains adequate drainage capacity while significantly reducing bleb volume and height, resolving the contradiction between productivity and object volume
Solution Approach 2:
The patent segments the drainage function into a specialized narrow tube (0.46mm diameter) rather than relying on a large plate surface area. This segmentation allows concentrated efficient drainage through a small aperture, maintaining high productivity while minimizing the overall implant volume and associated bleb formation
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 reduces bleb size and height, enhances fluid flow management, minimizes post-surgical complications, and effectively regulates intraocular pressure, while also incorporating anti-microbial coatings to prevent infection, resulting in a more stable and efficient glaucoma treatment.
Implementation Method 1
The shunt also includes a flow restrictor that controls a rate of flow of the aqueous humor through the drainage tube
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
A method of treating glaucoma in an eye by managing fluid flow past an implanted shunt (10) having an elastomeric plate (40) and a non-valved elastomeric drainage tube (46). The plate is positioned over a sclera of the eye with an outflow end (50) of the elastomeric drainage tube open to an outer face of the plate. An inflow end (52) of the drainage tube tunnels through the sclera to the anterior chamber of the eye. The plate may have regions of greater propensity for cell adhesion alternating with regions of lesser cell adhesion. For example, regions of texturing around the plate or drainage tube may be provided to control the size of a bleb that forms over the implant. The effective surface area of the plate may be balanced against a number of fenestrations (64). The drainage tube has a reduced profile and may be shaped with a non-circular external cross-section to reduce its height.; A scleral groove may be used to further reduce the height of the drainage tube on the sclera. A flow restrictor for the early post operative period will immediately lower the intraocular pressure (IOP) and simultanously prevent hypotony.