Radiopaque Hydrogel Composition With Tunable Breakdown Duration
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Solution Overview
Problem
Existing hydrogels used in medical applications, such as SpaceOAR Vue®, lack flexibility in radiopacity and breakdown duration, limiting their applicability and effectiveness in various medical treatments.
Innovation Solution
Development of radiopaque hydrolysable hydrogels formed by a reactive multi-arm polymer and a polyamino compound, allowing for tunable crosslink density and in vivo persistence, with enhanced radiopacity and controlled breakdown through a crosslinked reaction product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiopaque groups are added to existing hydrogels, then radiopacity is improved, but flexibility in radiopacity and breakdown duration is limited
Solution Approach 1:
The patent applies parameter changes by systematically varying the iodine content (0-4 iodine atoms per lactone ring), polymer arm functionality (3-12 arms), and crosslinker ratios to achieve tunable radiopacity and breakdown duration. This allows the hydrogel properties to be customized for different medical applications rather than being fixed.
Solution Approach 2:
The patent creates composite materials by combining radiopaque lactone rings with hydrophilic polymer segments, cyclic imidyl ester groups, and polyamino crosslinkers. This composite structure integrates multiple functions: radiopacity from iodinated lactone, biocompatibility from hydrophilic segments, and controllable degradation from hydrolysable ester linkages.
2Strength
If crosslink density is increased to improve hydrogel stability, then strength is improved, but breakdown duration becomes less controllable
Solution Approach 1:
The patent applies dynamics by making the crosslink density and breakdown rate adjustable rather than fixed. By varying the polyamino compound to reactive multi-arm polymer ratio and the number of reactive groups per polymer arm, the hydrogel's mechanical strength and degradation timeline can be dynamically tuned for different clinical needs.
Solution Approach 2:
The patent uses parameter changes to control crosslink density through systematic variation of crosslinker concentration, polymer arm functionality (3-12 arms), and reaction conditions. This enables precise control over both the initial strength and the degradation profile of the hydrogel.
3Reliability
If existing hydrogel structures are used, then clinical success is achieved, but applicability to various medical treatments is limited
Solution Approach 1:
The patent applies universality by designing a platform hydrogel system that can serve multiple medical applications. The reactive multi-arm polymer with tunable parameters (iodine content, arm number, segment type) can be adapted for radiation therapy spacing, embolization, tissue augmentation, and drug delivery, replacing multiple specialized products with one versatile platform.
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 new hydrogels provide improved radiocontrast and tunable crosslink density, maintaining radiopacity and controlled breakdown, expanding their medical applications beyond current hydrogel limitations.
Implementation Method 1
the reactive multi-arm polymer and the polyamino compound react to form a crosslinked hydrogel
Implementation Method 2
The breakdown occurs primarily through the hydrolysis of the ester linkages in the glutarate groups
Data Source
AI summary
In some aspects, the present disclosure provides a system for forming a hydrogel that comprises: a reactive multi-arm polymer that comprises three or more polymer arms linked to a core region, at least three of the three or more polymer arms comprising a cyclic-imidyl ester group, a hydrolysable ester group, an iodinated lactone residue, an amide group and a hydrophilic polymer segment, where the cyclic-imidyl ester group is linked to the iodinated lactone residue through the hydrolysable ester group, the iodinated lactone residue is linked to the hydrophilic polymer segment through the amide group, and the hydrophilic polymer segment is linked to the core region; and a polyamino compound comprising at least two amino (—NH2) groups, wherein the reactive multi-arm polymer and the polyamino compound react to form a crosslinked hydrogel. Other aspects pertain to crosslinked hydrogels formed from such systems and methods of treatment using such systems.