Self-assembling Biomimetic Hydrogels for Tissue Adhesion
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Solution Overview
Problem
Current bioadhesive materials for tissue engineering face challenges such as toxicity, weak tissue adhesion, and post-implantation dislocation, which hinder long-term cell survival and integration with surrounding host tissue.
Innovation Solution
A liquid composition comprising a thermally-desolubilizable polymer, an aminated component of extracellular matrix, and a polymeric component capable of forming covalent bonds, which transforms into a solidified matrix upon injection, providing strong and durable adhesion while supporting cell survival and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen bonding is used for tissue adhesion, then the material can be biocompatible, but the adhesion strength is too weak for load-bearing situations
Solution Approach 1:
The patent combines two different adhesion mechanisms into a composite system: hydrogen bonding for biocompatibility and covalent bonding for strength. The polymer composition includes functional groups that can form both hydrogen bonds with tissue (maintaining biocompatibility) and covalent bonds (providing load-bearing strength), thus resolving the contradiction between weak adhesion and biocompatibility.
Solution Approach 2:
The patent modifies the chemical parameters of the polymer by incorporating specific functional groups (such as carboxyl, hydroxyl, or amine groups) that can undergo chemical modification to form covalent bonds. This parameter change allows the material to transition from simple hydrogen bonding to a dual-mode adhesion system, achieving both strength and biocompatibility.
2Strength
If reactive functional groups are used to enhance adhesion, then tissue bonding improves, but cell viability and differentiation are compromised due to toxicity
Solution Approach 1:
The patent applies functional groups locally at the tissue interface rather than throughout the entire material bulk. The polymer composition is designed with surface-modified functional groups that provide strong covalent bonding at the adhesion site, while the bulk material remains biocompatible and non-toxic to cells. This local application of reactive groups resolves the contradiction between adhesion strength and cell viability.
Solution Approach 2:
The patent uses biocompatible polymer chains as intermediaries between the covalent bonding interface and the cellular environment. These intermediary polymer segments provide a buffer zone that allows strong tissue bonding through covalent bonds while maintaining a non-toxic, cell-friendly environment for cell survival and differentiation.
3Reliability
If in situ crosslinking is used to achieve adhesion, then tissue integration improves, but heat generation and leaking of unreacted macromers occur
Solution Approach 1:
The patent employs self-assembling polymer chains that automatically organize and form covalent bonds without requiring external activation or crosslinking agents. The polymer composition contains pre-configured functional groups that spontaneously react under physiological conditions, eliminating the need for in situ crosslinking processes that generate heat or release toxic macromers, thus achieving tissue integration without harmful side effects.
Solution Approach 2:
The patent extracts and eliminates the problematic in situ crosslinking step from the adhesion process. Instead of using reactive macromers that require crosslinking, the invention uses pre-formed polymer chains with built-in bonding capabilities that adhere directly to tissue without generating heat or releasing unreacted components.
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 composition achieves strong and durable tissue adhesion, supports long-term cell survival, and prevents dislocation, enhancing the integration of bioadhesive materials with host tissue for effective tissue engineering applications.
Implementation Method 1
a biocompatible thermally-desolubilizable polymer that exists in an extended form below a critical solution temperature and in a condensed form at or above the critical solution temperature
Data Source
AI summary
The disclosure relates to a composition that is liquid at a temperature below the body temperature of a mammal and that solidifies at or above the body temperature of the mammal. The composition includes a thermally-desolubilizable polymer interspersed with a polymeric component of extracellular matrix and an encapsulated form of an amine compound (preferably an aminated component of extracellular matrix) that is de-encapsulated in the body of the mammal. The polymeric component is able to form covalent bonds with amine moieties in the aminated component, in one or more tissues in the body of the mammal, or both. Upon injection of a liquid suspension of these components into the body of the mammal, the thermally-desolubilizable polymer condenses, entrapping the polymeric component. The polymeric component binds covalently with a tissue in the body, and the aminated component end-caps the remaining reactive moieties of the polymeric component, forming a matrix at the site of injection. The disclosure also relates to uses of such compositions for forming a matrix on or within the body of a mammal. The compositions have a variety of uses, such as bioadhesives, as sealants for ruptured tissues, as drug or imaging agent depots, or as mechanical cushions.