Skin Adhesion Sheet Structure for Compact Wearable Drug Delivery

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Solution Overview

Problem

Existing medical devices face challenges in stably adhering an adhesion member to the skin of a living body, particularly due to deformation issues when the attachment is detached from the housing.

Innovation Solution

A medical device design featuring a flexible sheet-shaped adhesion member with an overhanging portion that includes a more rigid overhanging body and a less rigid easily deformable portion, allowing the overhanging portion to return to its original shape after detachment, ensuring the adhesion surface remains planar and stable on the skin.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the overhanging portion is made entirely of easily deformable material, then the device becomes compact when attachment is attached, but the adhesion surface cannot be easily pressed with fingers for stable adhesion

Engineering Contradiction:

Improvedevice compactnessVSAvoidease of pressing adhesion surface

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The overhanging portion is divided into two regions with different rigidity properties: the easily deformable portion (first region) made of soft elastic material for compactness, and the overhanging body (second region) made of harder elastic material for ease of pressing. This local differentiation allows each region to fulfill its specific functional requirement without compromising the other.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the overhanging portion is made entirely of rigid material, then the adhesion surface can be easily pressed with fingers, but the device cannot be made compact when attachment is attached

Engineering Contradiction:

Improveease of pressing adhesion surfaceVSAvoiddevice compactness

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

3Device complexity

If the overhanging portion remains deformed after attachment detachment, then the device structure is simpler, but the adhesion surface becomes non-planar and cannot be stably adhered to skin

Engineering Contradiction:

Improvestructure simplicityVSAvoidadhesion stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The easily deformable portion is designed to be elastically deformable during attachment attachment and detachment, automatically returning to its original planar shape after detachment is released. This dynamic elastic recovery ensures the adhesion surface maintains planarity and stability without requiring complex mechanical reset mechanisms.

Inventive Principle:

Principle #15Dynamics

4Volume of moving object

If the entire adhesion member is made of soft material, then the overhanging portion can deform along the housing surface, but the adhesion member lacks sufficient rigidity for stable adhesion

Engineering Contradiction:

Improvedeformation capabilityVSAvoidadhesion member rigidity

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The adhesion member is designed with spatially varying rigidity: the easily deformable portion (first region) uses soft elastic material for deformation and compactness, while the overhanging body (second region) uses harder elastic material for rigidity and adhesion stability. The base sheet provides additional structural support where needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The adhesion member combines different elastic materials with varying rigidity properties in a single integrated structure. The softer material in the easily deformable portion and harder material in the overhanging body create a composite structure that simultaneously achieves deformability for compactness and rigidity for stable adhesion.

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 design enables stable adhesion to the skin by preventing deformation of the overhanging portion and allowing easy detachment without residual deformation, facilitating efficient administration of liquid medicine through a compact device.

Implementation Method 1

the easily deformable portion is provided at least a portion deformed (for example, curved to be deformed) between the attachment and the housing in the attached state of the overhanging portion... the overhanging portion easily returns to its original shape when the attachment is detached from the housing

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS20260083905A1Medical device

Publication Date: 2026.03.26 TERUMO KK

AI summary

A medical device includes: a housing; a flexible sheet-shaped adhesion member that is provided in the housing and includes an adhesion surface configured to be adhered to a skin of a living body; and an attachment that is detachably attached to the housing. The adhesion member includes: an adhesion body that is fixed to a first outer surface of the housing, and an overhanging portion that extends from the adhesion body so as to overhang outward from the housing, and is pushed by the attachment in an attached state in which the attachment is attached to the housing and deforms along a second outer surface adjacent to the first outer surface of the housing. The overhanging portion includes: an overhanging body, and a deformable portion.