Hydrocolloid Infusion Set Adhesive for Extended Wear and Easy Removal

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Solution Overview

Problem

Existing infusion set adhesives cause irritation, become unstuck, or are difficult to remove after extended wear times, leading to issues like pain, bleeding, infection, and reduced insulin sensitivity, deterring patients from using continuous subcutaneous insulin infusion therapy.

Innovation Solution

A hydrocolloid adhesive structure with a release liner and optional protective layer, designed for infusion sets and continuous glucose monitors, allowing extended wear times of up to 14 days without irritation, ensuring secure adhesion and easy removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If acrylic adhesives are used to adhere the infusion hub to the skin, then initial adhesion strength is achieved, but skin irritation and adhesive failure occur after extended wear times

Engineering Contradiction:

Improveadhesion strengthVSAvoidskin irritation

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the adhesive from acrylic-based to hydrocolloid-based materials. This fundamental material parameter change enables the adhesive to maintain skin compatibility over extended wear periods (7-14 days) while preserving adhesion strength, directly resolving the contradiction between initial bonding and long-term skin tolerance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite adhesive structures that may combine hydrocolloid materials with other biocompatible components. This composite approach allows the adhesive to simultaneously achieve strong initial adhesion and prolonged skin compatibility, overcoming the limitations of single-material acrylic adhesives that fail after extended wear.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If acrylic adhesives are used for extended wear times, then adhesion duration is increased, but adhesive becomes difficult to remove causing pain and bleeding

Engineering Contradiction:

Improvewear timeVSAvoidremoval ease

Core Design Contradiction:

Duration of action of stationary objectVSEase of operation

Solution Approach 1:

The patent changes the adhesive material parameters from acrylic to hydrocolloid composition, which fundamentally alters the removal characteristics. Hydrocolloid adhesives maintain strong adhesion over 7-14 days but can be removed easily without causing pain or bleeding, directly resolving the contradiction between extended wear duration and ease of removal.

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If acrylic adhesives are used for prolonged periods, then adhesion persistence is achieved, but adhesive fails to stay stuck causing early removal

Engineering Contradiction:

Improveadhesion persistenceVSAvoidadhesive reliability

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent changes the adhesive material from acrylic to hydrocolloid composition, which resolves the reliability issue. Hydrocolloid adhesives maintain consistent performance over extended wear periods (7-14 days) without becoming unstuck, eliminating the premature failure problems associated with acrylic adhesives while preserving adhesion persistence.

Inventive Principle:

Principle #35Parameter changes

4Loss of time

If infusion sets are worn for extended periods to reduce site rotation, then therapy continuity is improved, but skin problems increase leading to set removal

Engineering Contradiction:

Improvesite rotation frequencyVSAvoidskin problems

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent changes the adhesive material parameters to hydrocolloid-based formulations that are specifically designed for extended wear. This enables infusion sets to be worn for 7-14 days at single sites without developing skin problems, directly resolving the contradiction between reducing site rotation frequency and preventing skin complications.

Inventive Principle:

Principle #35Parameter changes

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 hydrocolloid adhesive structure provides prolonged adhesion, reducing skin irritation and facilitating easy removal, thereby enhancing patient comfort and adherence to continuous therapy.

Implementation Method 1

The adhesive structure may include a layer of adhesive having at least one opening therethrough for receiving a cannula of an infusion set... wherein the layer of adhesive is a hydrocolloid adhesive

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS20250339647A1Infusion set and an adhesive structure therefor

Publication Date: 2025.11.06 UNOMEDICAL AS

AI summary

An adhesive structure for an infusion set comprises a layer of adhesive having at least one opening therethrough for receiving a cannula of an infusion set and a release liner. The layer of adhesive is a hydrocolloid adhesive, which is a blend of one or more pressure sensitive adhesives and one or more water dispersible hydrocolloids. An adaptor is provided which includes the adhesive structure; wherein the layer of adhesive has a skin-facing surface and an opposite infusion hub-facing surface; wherein a release liner is provided on the skin-facing surface; and wherein a protective layer is provided on the infusion set-facing surface. An infusion hub of an infusion set is also described, which includes the adhesive structure.