Hydrogel Composition for Predictable Hydrolytic Degradation
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Solution Overview
Problem
Existing hydrogel technologies exhibit unpredictable degradation kinetics, making them difficult to use in medical applications where controlled degradation is desired.
Innovation Solution
Hydrogels composed of a first polymer with ester-containing moieties and a second polymer with amide-containing moieties, crosslinked via a crosslinker, allowing for tunable degradation kinetics through varying ratios of ester- and amide-linked macromers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If traditional hydrogel technologies are used, then hydrogels can degrade over time, but the degradation kinetics are unpredictable and difficult to control
Solution Approach 1:
The hydrogel is segmented into two distinct polymer networks: a first polymer network with hydrolytically degradable ester bonds and a second polymer network with hydrolytically stable amide bonds. This segmentation allows independent control of degradation pathways, where the ester-containing network provides tunable degradation kinetics while the amide-containing network maintains structural integrity, resolving the contradiction between predictable and controllable degradation.
Solution Approach 2:
The degradation kinetics are controlled by changing the compositional parameter of the hydrogel, specifically the ratio of ester-containing to amide-containing polymers. By adjusting this parameter, the degradation rate can be precisely tuned from fast to slow, providing reliable and predictable degradation behavior that matches the desired duration of action for different medical applications.
2Strength
If hydrogels are designed for permanent implantation, then structural stability is maintained, but therapeutic agents cannot be released over time
Solution Approach 1:
The hydrogel structure is segmented into degradable and non-degradable components. The ester-containing polymer network degrades over time to enable therapeutic agent release, while the amide-containing polymer network maintains structural stability. This segmentation resolves the contradiction by assigning different functional roles to different polymer networks within the same hydrogel system.
Solution Approach 2:
The hydrogel is a composite material combining two polymer networks with complementary properties: ester-containing polymers that provide controlled degradation and amide-containing polymers that provide structural stability. This composite structure enables simultaneous achievement of both therapeutic agent release and mechanical support functions.
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 hydrogels demonstrate tunable degradation rates, enabling controlled release of therapeutic agents and promoting tissue growth or wound healing by adjusting the ratio of ester- and amide-linked components.
Implementation Method 1
the first polymer comprises at least one ester-containing moiety
Implementation Method 2
the crosslinker is covalently bound to the first polymer and the second polymer
Data Source
AI summary
A hydrogel is provided comprising a first polymer, a second polymer, and a crosslinker. The first polymer comprises at least one ester-containing moiety and at least one first crosslinking moiety. The second polymer comprises at least one amide-containing moiety and at least one second crosslinking moiety. The crosslinker is covalently bound to the first polymer and the second polymer via the first crosslinking moiety and the second crosslinking moiety. Articles formed from the hydrogel as well as methods of use are also described.