Flexible Injection Container With Tension Spring Contraction Member
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Solution Overview
Problem
Flexible containers for injection devices are prone to self-damage during emptying, and existing solutions lack controlled collapsing behavior and cost-effectiveness in manufacturing.
Innovation Solution
A flexible container with a tension spring contraction member that connects oppositely located ends, providing a controlled collapsing behavior and preventing self-damage by exerting a collapsing force, while being cost-efficient to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flexible container is used to enable complete emptying and controlled collapsing, then the container may self-damage during emptying, but using a rigid container prevents self-damage while making complete emptying difficult
Solution Approach 1:
The patent employs a flexible container made of deformable material that can collapse as medicament is withdrawn, enabling complete emptying while maintaining controlled deformation through integrated structural elements
Solution Approach 2:
The flexible container is segmented into functional zones including a deformation zone with integrated stiffening elements that control the collapsing behavior, allowing the container to empty completely without self-damaging
2Strength
If glass cartridges are used to ensure chemical inertness and optical transparency, then the container is fragile and prone to mechanical impact, but using flexible materials prevents breakage while reducing chemical inertness
Solution Approach 1:
The patent replaces traditional glass cartridges with flexible containers made of chemically inert materials that resist mechanical impact while maintaining pharmaceutical compatibility through material selection and surface treatment
Solution Approach 2:
The flexible container utilizes composite material structures combining flexible polymers with reinforcing layers to achieve both mechanical durability and chemical inertness required for medicament storage
3Productivity
If a tension spring contraction member is added to provide controlled collapsing behavior, then manufacturing cost increases, but without it the container cannot be emptied completely
Solution Approach 1:
The patent integrates the contraction function directly into the container structure through deformation zones with built-in stiffening elements, merging the collapsing mechanism with the container body to eliminate separate contraction components and reduce manufacturing complexity
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 flexible container ensures controlled and complete emptying with reduced risk of self-damage and is cost-effective for mass production, maintaining the integrity of the container during medicament withdrawal.
Implementation Method 1
The contraction member comprises a tension spring having at least two windings enclosing the bag. The tension spring is of helical shape.
Implementation Method 2
By means of the contraction member a well-defined collapsing behavior of the flexible bag is obtained as the liquid medicament is withdrawn from its interior volume.
Data Source
Figure 1~3
AI summary
The present invention relates to a flexible container for an injection device (50), comprising: a flexible bag (12) having an interior volume (14) to be filled with a liquid medicament (16), an outlet (19) located at a first end (13) of the bag (12), a contraction member (30) connected to the bag (12) to displace a second end (15) of the bag (12) located opposite to the first end (13) towards the first end (13).