Microporous Glaucoma Shunt With Variable Flow Resistance
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Solution Overview
Problem
Conventional glaucoma drainage devices are bulky, lack flexibility, and cause irritation and scarring, leading to ineffective fluid absorption and increased intraocular pressure.
Innovation Solution
A glaucoma shunt with a microporous material forming a reservoir and conduit, featuring variable flow resistances and transitioning from hydrophobic to hydrophilic states, to facilitate controlled fluid drainage and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional glaucoma drainage devices are used, then fluid drainage function is provided, but the devices are bulky and cause irritation and scarring at the implantation site
Solution Approach 1:
The shunt body is formed from a flexible microporous material that can be molded into thin-walled structures. This flexible membrane construction allows the device to conform to tissue contours, reducing irritation and scarring while maintaining adequate drainage function without requiring bulky components.
Solution Approach 2:
The shunt body is constructed from microporous material that provides both structural integrity and fluid drainage functionality. The porous structure allows fluid passage through the shunt body walls, eliminating the need for separate drainage openings and reducing overall device complexity and size.
2Reliability
If conventional rigid shunts are used, then fluid drainage is achieved, but device/tissue attachment is insufficient leading to relative motion and continued tissue stimulation
Solution Approach 1:
The flexible microporous material allows the shunt to conform to and attach to surrounding tissues through mechanical interlocking and tissue ingrowth. This flexibility eliminates relative motion between device and tissue, preventing continued stimulation and irritation while maintaining secure attachment.
Solution Approach 2:
The microporous material properties (porosity, flexibility, surface characteristics) are optimized to promote tissue attachment and integration. These material parameter changes enable reliable device/tissue attachment while minimizing harmful tissue reactions.
3Productivity
If uniform flow resistance is used in the shunt, then manufacturing is simplified, but controlled fluid drainage at different stages is not achieved
Solution Approach 1:
The shunt body incorporates zones with different porosity levels to create variable flow resistance. Areas with higher porosity allow greater fluid passage, while areas with lower porosity provide restriction. This local variation in material quality enables controlled drainage rates at different stages without requiring complex mechanical components.
Solution Approach 2:
The microporous material structure is varied spatially within the shunt body to create different flow resistance zones. This porous structure design allows control of fluid drainage rate through material architecture rather than complex mechanical mechanisms, balancing manufacturing simplicity with functional 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 shunt provides controlled fluid drainage, reducing irritation and scarring, maintaining stable intraocular pressure, and promoting effective fluid absorption.
Implementation Method 1
the microporous material is configured to transition from a hydrophobic state to a hydrophilic state when exposed to the aqueous humor
Implementation Method 2
the conduit and the reservoir together define a flow passage along which the drainage of the aqueous humor flows through the conduit, to the reservoir, and into the surrounding tissue via the microporous material
Data Source
AI summary
Glaucoma shunts for draining fluid from an eye to surrounding tissue and being implantable within eye tissue, the shunts include a shunt body formed from microporous materials arranged to form a reservoir within the shunt body, and a conduit having a proximal end in fluid communication with the reservoir and an opposing distal end, the distal end being insertable into the eye to facilitate drainage of fluid into the conduit via the distal end, wherein the conduit and the reservoir together define a flow passage along which drainage of fluid flows through the conduit, to the reservoir, and into surrounding tissue via the microporous material, wherein the flow passage presents a variable flow resistance along the conduit that has a plurality of sequential flow resistances with first and second flow resistances defined therein such that the first flow resistance is different from the second flow resistance.