Hydrolytically Degradable Polysaccharide Hydrogels for Controlled Release
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Solution Overview
Problem
Current hydrogels used for encapsulating cells or releasing therapeutic agents are limited as they degrade only in the presence of specific enzymes, making them ineffective in environments lacking these enzymes, and their degradation rate cannot be easily controlled.
Innovation Solution
Development of hydrolytically degradable polymer compositions with a biocompatible backbone and a hydrolytically degradable linker, allowing for controlled degradation in an aqueous medium, and the use of macromers comprising a biocompatible backbone unit, a polymerizing moiety, and a hydrolytically degradable linker to create hydrogels that can degrade independently of enzymatic presence, with the ability to tune the degradation rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogels are made to degrade only in the presence of specific enzymes, then biocompatibility is improved, but degradation control and applicability in enzyme-lacking environments deteriorate
Solution Approach 1:
The patent changes the chemical parameter of the crosslinker from enzyme-sensitive to hydrolytically degradable. By selecting crosslinkers with specific hydrolytic stability parameters, the hydrogel can be tuned to degrade at controlled rates in aqueous environments without requiring specific enzymes, thus maintaining biocompatibility while improving degradation control and environmental adaptability
Solution Approach 2:
The patent creates a composite crosslinking system where hydrolytically degradable crosslinkers are combined with biocompatible polymer chains. This composite approach allows the hydrogel to exhibit both biocompatibility (from the polymer composition) and controlled hydrolytic degradation (from the crosslinker chemistry), resolving the contradiction between enzyme-dependency and degradation control
2Manufacturing precision
If hydrogels use enzyme-dependent degradation, then selectivity of degradation is improved, but degradation rate control and tunability deteriorate
Solution Approach 1:
The patent employs parameter changes by selecting crosslinkers with specific hydrolytic stability values and chemical structures. By adjusting parameters such as crosslinker molecular weight, hydrolytic stability, and functional group composition, the degradation rate can be precisely tuned from days to months, providing both selectivity and controllable productivity in degradation
Solution Approach 2:
The patent introduces dynamic control of degradation rates through the selection of different hydrolytically degradable crosslinkers. The system allows dynamic adjustment of degradation timing and rate by choosing crosslinkers with varying hydrolytic stabilities, enabling the hydrogel to adapt its degradation profile to match different therapeutic or application requirements
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
Enables controlled release of active agents and growth factors, supports cell viability and differentiation, and allows for the growth of cartilaginous tissue by modulating the environment, providing enhanced control over hydrogel degradation and structural evolution.
Implementation Method 1
hydrolytically degradable linker disposed between the biocompatible backbone unit and the polymerizing moiety
Data Source
AI summary
Provided are polysaccharide compositions capable of controllable hydrolytic degradation and suitable for controlled release of therapeutic agents. Also provided are methods for synthesizing such compositions and a variety of applications in which the compositions may be used.