Patch Injector Release Liner Layout for One-Handed Removal
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Solution Overview
Problem
Existing patch injection devices require both hands for release liner removal, risking device drop and drug loss, and have limited skin attachment surface area for larger volume reservoirs.
Innovation Solution
A patch injection device with a flexible adhesive substrate forming a skirt surrounding the housing, featuring a cut-out for the release liner pull tab that allows one-handed liner removal by transmitting peel force directly to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the release liner is made of low-adhesive material to facilitate removal, then the ease of operation is improved, but the reliability of maintaining patch integrity during storage is worsened
Solution Approach 1:
The release liner is divided into two distinct portions: a first portion with high adhesive properties that maintains patch integrity during storage, and a second portion with low adhesive properties that facilitates easy removal during application. This segmentation allows each portion to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different regions of the release liner are given different adhesive properties. The first portion (proximal to the patch) has high adhesive strength to secure the patch during storage, while the second portion (distal to the patch) has low adhesive strength for easy removal. This local differentiation of properties resolves the contradiction between holding power and ease of removal.
2Ease of operation
If the release liner is made larger to provide sufficient removal surface, then the ease of operation is improved, but the device complexity and material usage increase
Solution Approach 1:
Instead of making the entire release liner large and uniformly low-adhesive, the invention applies low-adhesive properties only to the second portion that needs to be removed. The first portion maintains high adhesive properties and can be smaller, thus providing sufficient removal surface area without unnecessarily increasing overall device complexity or material usage.
Solution Approach 2:
The release liner is segmented into functional zones with different sizes and adhesive properties. The second portion (for removal) is optimized for size and low adhesion, while the first portion (for attachment) is optimized for adhesion strength. This segmentation allows the removal surface to be adequate without the entire liner being oversized.
3Reliability
If the adhesive layer is made stronger to ensure secure attachment, then the reliability is improved, but the ease of removal of the entire assembly is worsened
Solution Approach 1:
The release liner's adhesive properties are segmented into two zones: the first portion has strong adhesive properties to ensure secure attachment of the patch during storage and handling, while the second portion has weak adhesive properties to allow easy removal of the liner from the patch after application. This segmentation resolves the contradiction between strong attachment and easy removal.
Solution Approach 2:
The removal function is extracted from the attachment function by creating a distinct second portion of the release liner with different adhesive properties. This extracted portion is specifically designed for easy removal and does not interfere with the strong attachment provided by the first portion, thus resolving the contradiction between secure attachment and easy removal.
Data Source
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AI summary
A patch injection device comprising a housing, an adhesive substrate having a first surface with a first surface area for skin attachment and a second surface which is opposite the first surface attaching partly to the housing and a removable release liner. The surface area of the second surface attaching to the housing is smaller than the first surface area and the excess area defines a skirt of the substrate at least partially surrounding the housing. The first surface of the substrate attaches to the removable release liner which fully covers the first surface area of the substrate. Furthermore a pull tab is provided being part of the release liner and located in a cut out of the skirt of the substrate such that a peel force is transmittable from the release liner to the housing at the location where the cut-out reaches the housing.