Autoinjector Safety Shield Deactivating Retaining Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-injection devices for medicinal products face challenges in ensuring safe and complete injection, particularly when users inadvertently remove the device from the skin before the injection is completed, leading to product loss and safety risks due to high force requirements and complex operation.
Innovation Solution
A device with a safety system that allows safe and efficient injection even if the user moves or removes the device after triggering the needle, featuring a housing with a movable container and safety shield, deactivating means, and biasing mechanisms that minimize the force needed for activation and prevent accidental needle exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a safety system covers the needle on displacement or removal of the injection device, then needle safety is improved, but the injection device becomes unusable and the medicinal product is lost
Solution Approach 1:
The patent employs dynamic state changes for the container and safety shield. The container transitions between passive and active states, while the safety shield moves between first and second positions. This dynamic behavior allows the system to adapt to user actions - if removal is detected, the shield covers the needle for safety; if injection proceeds, the system remains functional throughout the process.
Solution Approach 2:
The system monitors positional parameters of the container and safety shield to determine user intent. By detecting whether the container moves to the insertion position and whether the safety shield moves to the second position, the system can distinguish between intentional injection and accidental removal, thereby maintaining reliability while ensuring safety.
2Force
If high force is applied on the skin at the injection site, then injection penetration is achieved, but operation complexity and user stress increase
Solution Approach 1:
The safety shield acts as an intermediary element between the user's manual pressure and the injection mechanism. When the user applies pressure to move the safety shield to the second position, this action indirectly triggers the container activation and subsequent injection sequence, reducing the direct force requirement on the skin while maintaining injection effectiveness.
Solution Approach 2:
The system performs preliminary actions by detecting safety shield movement and automatically activating the container and injection sequence. This eliminates the need for the user to directly apply high force to trigger the injection, as the system initiates the process based on the safer, lower-force action of moving the safety shield.
3Reliability
If the trigger is locked prior to use, then inadvertent activation is prevented, but the device cannot be activated if not correctly positioned
Solution Approach 1:
The system uses feedback from the safety shield position and container state to control trigger activation. The trigger remains locked until the safety shield moves to the second position, at which point the system receives feedback indicating correct positioning and user intent, thereby unlocking the trigger. This feedback mechanism prevents inadvertent activation while ensuring the device can be activated when correctly positioned.
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 device ensures a complete and safe injection with minimal user force, preventing product loss and reducing misuse risks, allowing for correct and safe completion of the injection process even if mistakes are made during use.
Implementation Method 1
first biasing means coupled to said housing for biasing the container toward said insertion position, said first biasing means being in one of a compressed condition, in which the container is in its initial position, and an extended condition, in which the container is in its insertion position
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to an autoinjector (1) comprising: - a housing (30, 30a, 30b), a container movable within said housing between an initial position and an insertion position, said movement being prevented when the container is in its passive state, and permitted when the container is in its active state, and - a safety shield (40) movable with respect to said housing between a first position and a second position, said movement placing the container in its active state, - first retaining means (61, 52) for maintaining said container in its passive state, characterized in that it comprises - first deactivating means (50, 51), capable of rotating with respect to said first retaining means from a first position, in which said first retaining means maintain said container in its passive state, to a second position, in which said first retaining means allow the passage of said container in its active state, said rotation being caused by movement of said safety shield from its first position to its second position under distal pressure exerted on said housing.