Therapeutic Hydrogels With Branched Polyamine Ionic Crosslinking
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Solution Overview
Problem
Existing therapeutic hydrogels lack effective crosslinking agents and methods for sustained release of therapeutic agents, particularly in medical applications requiring precise control over pH and ionic interactions.
Innovation Solution
Therapeutic hydrogels comprising anionic polysaccharides crosslinked by branched polyamines, which are positively charged at pH 5.5 to 7.5, allowing for ionically crosslinked structures that can incorporate imaging agents and therapeutic agents for controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crosslinking agents are used in therapeutic hydrogels, then hydrogel structure can be formed, but effective crosslinking and sustained release of therapeutic agents cannot be achieved
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by using branched polyamines with specific molecular weights (200-2000 Da) and specific numbers of primary amine groups (3-25 groups per molecule). This parameter optimization enables both effective crosslinking of anionic polysaccharides and sustained release of therapeutic agents, resolving the contradiction between crosslinking effectiveness and sustained release capability.
Solution Approach 2:
The patent creates a composite crosslinking system combining branched polyamines with anionic polysaccharides. The polyamine-polysaccharide complex forms a dual-function network that provides both structural integrity through crosslinking and controlled release of therapeutic agents, simultaneously achieving reliable crosslinking and sustained release.
2Reliability
If pH control is not optimized, then hydrogel formation is simpler, but stable therapeutic environment cannot be provided
Solution Approach 1:
The branched polyamine crosslinking system self-regulates pH through its protonation/deprotonation equilibrium. The primary amine groups naturally buffer the environment at physiological pH (5.5-7.5) without requiring external pH control mechanisms, providing stable therapeutic conditions while maintaining system simplicity.
3Ease of manufacture
If simple hydrogel structures are used, then ease of manufacture is improved, but effective therapeutic agent incorporation and release cannot be achieved
Solution Approach 1:
The branched polyamine crosslinking system performs multiple functions simultaneously: it crosslinks anionic polysaccharides to form hydrogel structure, provides pH buffering for therapeutic stability, and creates controlled release pathways for therapeutic agents. This multi-functionality is achieved through a single crosslinking mechanism, maintaining ease of manufacture while enabling versatile therapeutic delivery.
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 provide a stable, pH-controlled environment for sustained release of therapeutic agents, enhancing medical applications such as embolic agents, tissue sealants, and tissue augmentation, while allowing for imaging and therapeutic delivery.
Implementation Method 1
the branched polyamine is positively charged and comprises two or more positively charged primary amine groups at the pH of the therapeutic hydrogel, and wherein the branched polyamine ionically crosslinks the anionic polysaccharide
Data Source
AI summary
The present disclosure pertains to therapeutic hydrogels that comprise an anionic polysaccharide crosslinked by a branched polyamine, wherein the branched polyamine comprises at least two primary amine groups, more typically at least three primary amine groups. The present disclosure also pertains to medical compositions that comprise such therapeutic hydrogels and to methods of medical treatment in which such therapeutic hydrogels are delivered to a patient in need of medical treatment.