Wearable Injector Adhesive Substrate with Cut-Outs
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Solution Overview
Problem
Existing on-body drug delivery devices face challenges in maintaining reliable adhesion to the patient's skin and accommodating varying body shapes, with a need for adjustable substrates that can stretch and deform to prevent dislodgement and leaks.
Innovation Solution
The use of a flexible, adhesive substrate with cut-outs and/or perforations that can be adjusted in size to conform to the patient's body, ensuring secure adhesion and comfort during normal movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid adhesive substrate is used to securely attach the device to the patient's body, then the adhesion strength is improved, but the substrate cannot accommodate varying body shapes and movements, leading to dislodgement and leaks
Solution Approach 1:
The substrate is constructed from flexible materials including a flexible adhesive layer and a flexible porous foam layer, allowing it to conform to curved body surfaces and accommodate body movements while maintaining secure adhesion. The flexible foam layer specifically enables the substrate to stretch and deform with body contours without compromising the adhesive bond strength.
Solution Approach 2:
The substrate incorporates a tear-away portion that can be removed after application to adjust the substrate size, and the flexible materials allow dynamic adaptation to body movements. This dynamic design enables the substrate to maintain its adhesive function while adapting to changing body shapes and positions during normal patient movement.
2Ease of manufacture
If a fixed-size substrate is used for device attachment, then the manufacturing process is simplified, but the device cannot accommodate different patient body sizes, leading to poor fit and potential dislodgement
Solution Approach 1:
The substrate is divided into a permanent portion and a tear-away portion, allowing the device to be manufactured in a standard size while enabling post-application size adjustment. The tear-away portion can be removed to reduce the substrate size for smaller patients or body areas, providing size adaptability without complicating the core manufacturing process.
Solution Approach 2:
The substrate design includes a removable tear-away portion that transforms a fixed-size substrate into a dynamically adjustable one. After application, the tear-away portion can be removed to adjust the substrate size to match different patient body sizes, maintaining both manufacturing simplicity and size adaptability.
3Reliability
If the substrate is made to closely conform to the body to prevent dislodgement, then the security of attachment is improved, but the device may cause discomfort or skin irritation during normal movements
Solution Approach 1:
The flexible porous foam layer provides cushioning between the device and the patient's skin, reducing pressure and friction during movements. This flexible layer allows the substrate to conform closely to body contours for secure attachment while simultaneously protecting the skin from irritation caused by tight adhesion.
Solution Approach 2:
The porous foam layer acts as a cushioning element between the adhesive substrate and the patient's skin, providing protection before skin irritation can occur. This layer absorbs friction and pressure during normal body movements, preventing harmful effects while maintaining the security of attachment.
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 substrate effectively reduces the risk of dislodgement and leaks, providing a secure and comfortable fit by conforming to the patient's skin and allowing for size adjustments, enhancing the reliability of drug delivery.
Implementation Method 1
a substrate securely adhered and conformed to the body of the patient
Implementation Method 2
a flexible, adhesive substrate with cut-outs and/or perforations that can be adjusted in size to conform to the patient's body
Data Source
AI summary
An on-body drug delivery device having a housing carried by a substrate. The substrate includes one or more cut-outs and/or one or more perforations to allow the substrate to better conform to the patient's body.