DOPA-Functionalized Polyalkylene Oxide Adhesives for Tissue Sealing

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Solution Overview

Problem

Current medical adhesives lack robust adhesion in wet environments and suitable mechanical properties for tissue adhesion and sealing, with existing options either providing poor tissue-adhesion or being stiff and brittle.

Innovation Solution

Development of multi-armed, poly(alkylene oxide)polyether derivatives functionalized with DOPA-based amino acids and peptides, which provide both adhesive and cohesive properties, allowing for effective wound closure and tissue sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If fibrin-based tissue sealants are used, then mechanical match for natural tissue is achieved, but tissue-adhesion characteristics are poor

Engineering Contradiction:

Improvemechanical match for natural tissueVSAvoidtissue-adhesion characteristics

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

The invention combines PEG polymer backbone with DOPA-containing peptide sequences to create a composite adhesive material that integrates the biocompatibility and flexibility of PEG with the strong adhesion properties of DOPA, resolving the contradiction between mechanical match and tissue adhesion

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention modifies the chemical composition by incorporating DOPA residues into the PEG structure, changing the adhesive parameters to achieve both mechanical compatibility and strong tissue bonding capabilities

Inventive Principle:

Principle #35Parameter changes

2Strength

If cyanoacrylate adhesives are used, then strong adhesive bonds with surfaces are produced, but mechanical properties become stiff and brittle

Engineering Contradiction:

Improveadhesive bondsVSAvoidmechanical properties

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The invention changes the polymer composition from rigid cyanoacrylate to flexible PEG backbone with DOPA functional groups, maintaining adhesive bond strength while improving mechanical flexibility and elasticity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The PEG-DOPA composite structure combines the bonding capability of DOPA with the flexible polymer chain of PEG, achieving strong adhesion without the brittleness of conventional cyanoacrylates

Inventive Principle:

Principle #40Composite materials

3Strength

If cyanoacrylate adhesives are used, then strong adhesive bonds are produced, but formaldehyde is released during degradation

Engineering Contradiction:

Improveadhesive bondsVSAvoidformaldehyde release

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The invention replaces the harmful degradation pathway of cyanoacrylate with a benign PEG degradation pathway that breaks down into non-toxic ethylene glycol units, eliminating formaldehyde release while maintaining adhesive performance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The PEG-DOPA composite uses biocompatible PEG as the polymer backbone, ensuring safe degradation products while DOPA provides the necessary adhesive bonding capabilities

Inventive Principle:

Principle #40Composite materials

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 DOPA-functionalized adhesives demonstrate strong adhesive strength on both metal and tissue surfaces, outperforming commercial fibrin glue in lap-shear tensile tests and exhibiting cohesive failure modes, indicating robust bonding capabilities.

Implementation Method 1

DOPA-containing peptides can be employed as the key components of synthetic medical adhesives... DOPA, an unusual amino acid which is believed to be responsible for adhesion to substrates

Methodology Applied

Scientific EffectAdhesion: Adhesive