Injectable Hydrogel Hybrid Material with Covalent Silica Binding
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Solution Overview
Problem
Existing biopolymeric hydrogels used as scaffolds for bone tissue reconstruction face challenges such as phase separation and uncontrolled diffusion of particles, lack of bioactivity, and inadequate support for osteoblast cell colonization and mineralization.
Innovation Solution
A biocompatible hydrogel hybrid material is developed by crosslinking a biopolymeric matrix of collagen, chitosan, and hyaluronic acid with silica particles functionalized with amine groups using genipin, forming a covalently bound hybrid material that is injectable and enzymatically degradable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biopolymeric hydrogels are used as scaffolds for bone tissue reconstruction, then they provide biocompatibility and structural support, but they suffer from phase separation and uncontrolled diffusion of particles
Solution Approach 1:
The patent creates a composite hydrogel system combining biopolymeric matrix (collagen, chitosan, hyaluronic acid) with silica particles functionalized with amine groups. This composite structure integrates two different materials to achieve both biocompatibility and enhanced structural stability, preventing phase separation through covalent bonding between the polymer matrix and silica particles
Solution Approach 2:
The patent replaces physical mixing or mechanical embedding of silica particles with covalent chemical bonding. The amine-functionalized silica particles form covalent bonds with the biopolymeric matrix during genipin crosslinking, substituting mechanical stabilization with chemical bonding to prevent particle diffusion and phase separation
2Reliability
If silica particles are dispersed in hydrogel matrix without covalent binding, then they provide bioactivity and mineralization acceleration, but they undergo uncontrolled diffusion to tissues
Solution Approach 1:
The patent replaces physical dispersion with covalent chemical bonding. Silica particles functionalized with amine groups form covalent bonds with the biopolymeric matrix through genipin crosslinking, substituting mechanical stabilization with chemical bonding to prevent particle diffusion while maintaining bioactivity
Solution Approach 2:
The patent applies functionalization only to the surface of silica particles with amine groups, creating a localized reactive interface. This local modification enables covalent bonding at the particle-matrix interface while preserving the bulk properties and bioactivity of the silica particles for mineralization acceleration
3Ease of operation
If hydrogel material is designed for injectability, then it enables non-invasive introduction into defects, but it requires controlled gelling properties
Solution Approach 1:
The patent utilizes changes in physical parameters (temperature, pH) and chemical parameters (genipin concentration, crosslinking time) to control the gelling process. The hydrogel maintains an injectable sol state under physiological conditions and transitions to a gel state through controlled crosslinking, achieving both injectability and controlled gelling
Solution Approach 2:
The patent exploits the sol-gel phase transition of the biopolymeric hydrogel. The material is prepared as a soluble injectable form that undergoes phase transition to an insoluble gel network through genipin-induced crosslinking, enabling non-invasive introduction followed by in situ gelation
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 hybrid material accelerates mineralization, supports osteoblast cell colonization, maintains biocompatibility, and exhibits bioactivity, while preventing particle diffusion, making it suitable for bone defect reconstruction.
Implementation Method 1
crosslinking through formation of covalent bonds with primary amine groups
Implementation Method 2
simultaneous crosslinking, with a biocompatible crosslinking agent, which is genipin, of a biopolymeric hydrogel matrix
Implementation Method 3
Surface functionalization with amine groups enabled covalent binding of silica particles with hydrogel polymeric network during crosslinking with genipin
Implementation Method 4
provides acceleration of mineralization processes
Implementation Method 5
suitable biomatrix for colonization by osteoblast-like cells
Implementation Method 6
after fulfilling its therapeutic function it will be enzymatically degraded (as was shown) with formation of biocompatible products
Data Source
AI summary
A biocompatible hydrogel hybrid material useful in regenerative medicine, in particular in reconstruction of bone tissue and a method of its preparation is disclosed.