Medical Device Packaging Seal Integrity via Segmented Heat Seals
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Solution Overview
Problem
Existing blister packaging containers for medical devices often require peeling off the sheet-like lid from specific corners, which can lead to seal fragility and unintended peeling, especially when started from different directions.
Innovation Solution
A medical device packaging container design featuring an annular heat seal portion with specific seal configurations, including first-side and second-side seal portions, and central and side-part seal extensions, which allow for easy peeling from various directions without creating seal fragility points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the heat seal portion is formed with a rectangular annular shape having four corners, then the packaging container can be easily manufactured, but the corners become curved and create seal fragility points that lead to unintended peeling
Solution Approach 1:
The heat seal portion is segmented into multiple regions: a first heat seal portion, a second heat seal portion, and a third heat seal portion. The third heat seal portion is positioned between the first and second heat seal portions and has a width greater than the other portions. This segmentation allows the seal to be divided into functional zones, with the wider third portion acting as a reinforcement that prevents propagation of peeling along the entire seal line, thereby maintaining seal integrity while retaining manufacturing simplicity.
Solution Approach 2:
The heat seal portion is designed with non-uniform width characteristics. Specifically, the third heat seal portion has a greater width than the first and second heat seal portions. This local variation in seal width creates regions of different seal strength, with the wider third portion serving as a reinforced zone that prevents unintended peeling propagation, while the narrower portions allow for controlled peeling initiation.
2Ease of operation
If the sheet-like lid is peeled from specific corners, then the sealing can be opened, but this creates seal fragility and increases the likelihood of unintended peeling
Solution Approach 1:
A peeling start portion is provided on the lid portion, which is positioned to correspond with a specific region of the heat seal portion. This peeling start portion serves as a pre-designed initiation point that guides users to start peeling from a controlled location. The peeling start portion may have different properties (such as reduced adhesion or structural features) that facilitate easy peeling initiation without compromising the overall seal integrity.
Solution Approach 2:
The heat seal portion is designed with non-uniform width characteristics. Specifically, the third heat seal portion has a greater width than the first and second heat seal portions. This local variation in seal width creates regions of different seal strength, with the wider third portion serving as a reinforced zone that prevents unintended peeling propagation, while the narrower portions allow for controlled peeling initiation.
3Device complexity
If the heat seal portion has uniform width throughout, then the manufacturing process is simplified, but peeling from various directions creates seal fragility
Solution Approach 1:
The heat seal portion is segmented into multiple regions: a first heat seal portion, a second heat seal portion, and a third heat seal portion. The third heat seal portion is positioned between the first and second heat seal portions and has a width greater than the other portions. This segmentation allows the seal to be divided into functional zones, with the wider third portion acting as a reinforcement that prevents propagation of peeling along the entire seal line, thereby maintaining seal integrity while retaining manufacturing simplicity.
Solution Approach 2:
The heat seal portion is designed with non-uniform width characteristics. Specifically, the third heat seal portion has a greater width than the first and second heat seal portions. This local variation in seal width creates regions of different seal strength, with the wider third portion serving as a reinforced zone that prevents unintended peeling propagation, while the narrower portions allow for controlled peeling initiation.
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 container enables satisfactory peeling of the sheet-like lid from any direction, reducing the likelihood of unintended peeling and maintaining seal integrity, thus ensuring the medical device remains securely packaged until use.
Implementation Method 1
an annular heat seal portion that peelably fixes the sheet-like lid portion on the annular flange portion
Data Source
AI summary
A medical device packaging container includes a tray, a sheet-like lid portion having an annular flange portion, and an annular heat seal portion. The annular heat seal portion includes a first-side seal portion, a second-side seal portion, a third-side seal portion, and a fourth-side seal portion. The first-side seal portion includes a central seal portion, a first side-part seal portion, and a second side-part seal portion. The central seal portion includes central seal extension portions, the first side-part seal portion includes a first side-part seal extension portion, and the second side-part seal portion includes a second side-part seal extension portion.