Branched Tissue-Adhesive Polymer for Stronger Biocompatible Wound Closure
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Solution Overview
Problem
Current tissue adhesives lack the balance of mechanical properties, biocompatibility, and ease of application required for effective wound closure, with cyanoacrylates causing inflammation and hydrogels lacking sufficient adhesion strength.
Innovation Solution
A biodegradable and biocompatible branched polymer with a melting point of 37-70°C, elastic modulus of 10-200 kPa, and shear storage modulus of 1-100 kPa, featuring tissue-binding groups, allowing for easy application and strong adhesion to biological surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cyanoacrylate-based glues are used for tissue adhesion, then adhesion strength is improved, but biocompatibility deteriorates due to severe inflammatory response
Solution Approach 1:
The patent changes the chemical composition parameters by using PCL and PEG polymers with specific molecular weights and ratios instead of cyanoacrylate, fundamentally altering the material's biocompatibility while maintaining adhesion through controlled polymer architecture
Solution Approach 2:
The invention creates a composite polymer system combining PCL (for structural integrity and adhesion) and PEG (for biocompatibility and flexibility), where each component contributes specific properties to achieve both strong adhesion and minimal inflammatory response
2Object-affected harmful factors
If hydrogels are used for tissue adhesion, then biocompatibility is improved, but adhesion strength deteriorates due to insufficient holding capability
Solution Approach 1:
The patent merges the biocompatibility advantage of hydrogels (PEG component) with the adhesion strength advantage of structural polymers (PCL component), creating a unified material that exhibits both properties simultaneously rather than requiring separate materials
Solution Approach 2:
The invention adjusts the polymer composition parameters, specifically the ratio of PCL to PEG and their molecular weights, to optimize the balance between adhesion strength and biocompatibility for different tissue types
3Ease of operation
If an ideal bioadhesive is designed to be liquid at room temperature for easy application, then ease of operation is improved, but temperature control becomes critical to avoid tissue damage
Solution Approach 1:
The patent utilizes the phase transition properties of the PCL-PEG polymer system, which transitions from solid to liquid at body temperature (37°C), allowing easy application in liquid form that automatically solidifies at the application site without requiring external heating or cooling control
Solution Approach 2:
The polymer system performs self-service by automatically adjusting its physical state according to temperature: remaining liquid during application for ease of use, then self-solidifying at body temperature to provide adhesion, eliminating the need for external temperature control mechanisms
4Strength
If the elastic modulus of the bioadhesive is increased to match stiffer tissues, then adhesion strength is improved, but compatibility with soft tissues deteriorates due to mechanical property mismatch
Solution Approach 1:
The patent changes the elastic modulus parameter by adjusting the PCL:PEG ratio and polymer molecular weights, enabling tuning of the material's stiffness to match different tissue types from soft (brain) to moderately firm (muscle) without compromising adhesion strength
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 polymer provides enhanced adhesion and cohesion strength while maintaining biocompatibility, reducing tissue damage and inflammation, and does not require a carrier for administration.
Implementation Method 1
The melting point of the branched polymer is in the range from 37 to 70° C.
Implementation Method 2
at least one arm comprises a tissue-binding group; the adhesion strength of the branched polymer is more than 0.5N
Data Source
AI summary
The present invention provides a branched biodegradable and biocompatible polymer (e.g. polycaprolactone) and use thereof in bioadhesion of at least one biological surface.