Non-degrading Swellable Polymer Hydrogels for Intraocular Shunts
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Solution Overview
Problem
Current intraocular shunts made from glutaraldehyde crosslinked porcine gelatin degrade over time due to tissue growth and fluid exposure, leading to inflammation, brittleness, and eventual failure, necessitating repeated treatments for glaucoma management.
Innovation Solution
Development of non-degrading swellable polymer hydrogels with alternating quaternary and secondary carbon atoms in the polymer backbone, which resist oxidation, hydrolysis, and embrittlement, allowing the shunts to swell upon hydration without degrading, thus maintaining biostability and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shunt is made from glutaraldehyde crosslinked porcine gelatin to enable swelling into place, then the shunt can be inserted through small needles and seal effectively, but the shunt degrades over time due to tissue growth and fluid exposure, leading to inflammation and eventual failure
Solution Approach 1:
The patent changes the chemical parameters of the polymer material from natural gelatin to synthetic polymers with controlled backbone structures (alternating quaternary and secondary carbon atoms). This parameter change enables the material to maintain both swelling capability and resistance to degradation, resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The patent employs composite polymer structures combining hydrophilic and hydrophobic segments in alternating patterns. This composite structure allows the material to swell when exposed to aqueous environments while maintaining structural integrity and resistance to enzymatic degradation, simultaneously achieving both swelling functionality and long-term biostability
2Object-affected harmful factors
If a shunt is made from collagen to enable biocompatibility, then the shunt is well-tolerated by tissue, but the shunt becomes brittle and fragile, breaking off when manipulated and requiring eventual replacement
Solution Approach 1:
The patent fundamentally changes the chemical structure from natural collagen to synthetic polymers with alternating quaternary and secondary carbon atoms. This structural parameter change eliminates the brittleness and fragility inherent in collagen while maintaining biocompatibility, allowing the shunt to withstand manipulation and long-term use without breaking
Solution Approach 2:
The patent creates a permanent, non-disposable shunt by using degradation-resistant polymer backbones. Unlike collagen shunts that eventually become brittle and require replacement, the synthetic polymer shunts maintain mechanical integrity indefinitely, eliminating the need for periodic replacements and reducing long-term treatment costs
3Reliability
If a shunt is designed to swell in place to seal between needle track and shunt, then effective sealing is achieved, but the shunt generates byproducts that provoke inflammation
Solution Approach 1:
The patent extracts and eliminates the problematic degradation-byproduct generation mechanism by using synthetic polymers with stable backbones that do not undergo hydrolysis or enzymatic degradation. The sealing function is retained through physical swelling, while the harmful chemical degradation reactions are completely removed from the system
Solution Approach 2:
The patent converts the swelling mechanism from a potentially harmful degradation process into a beneficial physical expansion process. The polymer swells through water absorption without breaking down, transforming what could be a source of inflammatory byproducts into a clean, biocompatible sealing mechanism
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 hydrogel-based intraocular shunts effectively maintain their structural integrity and functionality within the eye, reducing the need for frequent replacements and minimizing complications associated with degradation, while allowing for precise fitting through small needles for minimally invasive procedures.
Implementation Method 1
non-degrading swellable polymer hydrogels... allowing the shunts to swell upon hydration
Implementation Method 2
The hydrogel-based intraocular shunts effectively maintain their structural integrity and functionality
Implementation Method 3
non-degrading swellable polymer hydrogels with alternating quaternary and secondary carbon atoms in the polymer backbone, which resist oxidation, hydrolysis, and embrittlement
Implementation Method 4
non-degrading swellable polymer hydrogels with alternating quaternary and secondary carbon atoms in the polymer backbone, which resist oxidation, hydrolysis, and embrittlement
Data Source
Figure 1A~1B
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AI summary
Disclosed herein are medical devices, such as intraocular shunts, that are made from materials comprising non-degradable, swellable polymer hydrogels, and methods of making and using the same.