Silicone Adhesive for Moving Joints

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Solution Overview

Problem

There is a need for elastomeric topical skin adhesives that can effectively close moving body joints like knees, wrists, and elbows, while providing a watertight seal to prevent post-surgical infections, and existing adhesives like cyanoacrylate-based products lack the necessary elasticity and durability.

Innovation Solution

A novel silicone-based curable adhesive composition using vinyl terminated polydimethylsiloxane, polydimethylhydro-co-polydimethylsiloxane cross linker, surface treated silica particles, and a platinum tetramethyldivinyl disiloxane diethyl maleate complex catalyst, which allows for rapid bonding and stretching up to 160% of original length with full recovery, offering improved skin holding forces and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If cyanoacrylate-based TSA products are used for skin closure, then skin holding forces are achieved, but elasticity and ability to accommodate moving body joints are insufficient

Engineering Contradiction:

Improveskin holding forcesVSAvoidelasticity for moving body joints

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical composition parameters by using vinyl terminated polydimethylsiloxane and polydimethylhydro-co-polydimethylsiloxane cross linker instead of cyanoacrylate, fundamentally altering the material properties to achieve both strength and elasticity. This parameter change enables the adhesive to stretch 160% of original length while maintaining skin holding forces, directly resolving the contradiction between strength and adaptability for moving joints.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite silicone-based adhesive system combining multiple components: vinyl terminated polydimethylsiloxane, polydimethylhydro-co-polydimethylsiloxane cross linker, and platinum catalyst. This composite material approach integrates the beneficial properties of each component to achieve both strong adhesion and high elasticity, allowing the adhesive to accommodate moving body joints while maintaining strong skin holding forces.

Inventive Principle:

Principle #40Composite materials

2Strength

If traditional adhesives are used for skin closure, then bonding is achieved, but watertight sealing to prevent infections is compromised

Engineering Contradiction:

Improvebonding strengthVSAvoidwatertight seal against infections

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the adhesive material parameters by using silicone-based chemistry with specific cross-linking mechanisms that create a more robust, flexible seal compared to traditional adhesives. The vinyl-siloxane cross-linking system produces a cohesive, elastic barrier that maintains watertight sealing while accommodating skin movement, thereby improving reliability for infection prevention without sacrificing bonding strength.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If silicone-based adhesives are used for moving body joints, then elasticity is improved, but curing speed may be reduced

Engineering Contradiction:

ImproveelasticityVSAvoidcuring speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent introduces a platinum catalyst as an intermediary substance that accelerates the curing reaction of the silicone-based adhesive. The catalyst mediates between the vinyl terminated polydimethylsiloxane and polydimethylhydro-co-polydimethylsiloxane cross linker, enabling rapid cross-linking and curing. This intermediary catalyst allows the adhesive to achieve both high elasticity and fast curing speed, resolving the contradiction between these two properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 silicone adhesive composition provides superior skin holding forces and elasticity, comparable to cyanoacrylate-based products, while ensuring a watertight seal and rapid curing, making it suitable for use on moving body joints and reducing the risk of post-surgical infections.

Implementation Method 1

The bonding formation is enabled by the condensation reaction between the silanol functions on the surface of silica particle and the OH functions on the skin.

Methodology Applied

Scientific EffectCondensation reaction:

Implementation Method 2

The platinum based novel catalyst also activates vinyl silylation reaction to allow vinyl terminated silicone polymer to cross link simultaneously to the condensation reaction.

Methodology Applied

Scientific EffectVinyl silylation reaction:

Implementation Method 3

the invented silicone-based TSA when combined with traditional wound closure devices can be stretched to 160% of its original length and fully recover to its original dimension.

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11479669B2Topical skin closure compositions and systems

Publication Date: 2022.10.25 ETHICON INC

AI summary

Novel compositions and systems for closure of wounds are disclosed. The compositions provide devices of improved flexibility and elasticity and are readily applied to wound sites or over wound closure devices. The present invention is also directed to a novel platinum catalyst for use in such compositions. The catalyst provides for rapid curing on topical surfaces such as skin and bonds to such surfaces in about 2-5 minutes.