Automatic Injection Device Safety Shield Isolation Mechanism
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Solution Overview
Problem
Existing self-injection devices often require high force to activate the safety shield after use, causing discomfort and potentially deterring patients from completing the injection process due to the pressure felt on the skin.
Innovation Solution
A device with a safety system that prevents incorrect activation and automatically deploys a safety shield using biasing means, featuring isolating mechanisms to mitigate the force felt during placement and deactivation, ensuring the needle is protected without exposing the user to accidental needlestick injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biasing means are used to automatically deploy the safety shield after injection, then needle protection is improved, but patient discomfort increases due to high force required during device placement
Solution Approach 1:
The device is segmented into distinct functional zones: a first isolating means positioned between the biasing means and the injection site, and a second isolating means positioned between the biasing means and the user's hand. This segmentation allows the biasing means to operate independently without transmitting force to the patient's skin, resolving the contradiction between reliable needle protection and comfortable device placement.
Solution Approach 2:
The isolating means act as intermediary elements that decouple the biasing means from both the injection site and the user's hand. These intermediaries allow the safety shield deployment mechanism to function while preventing the transmission of uncomfortable or harmful forces, thus maintaining both needle protection reliability and ease of operation.
2Reliability
If the safety system prevents triggering before correct placement, then injection safety is improved, but device complexity increases
Solution Approach 1:
The device requires preliminary action in the form of pushing the distal end of the housing to activate the safety system before the injection can be triggered. This preliminary action ensures correct placement and activates the isolating means, providing a simple yet effective safety mechanism that prevents inadvertent activation without requiring complex electronic or mechanical systems.
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 safe and comfortable use by preventing unintended activation and automatic needle protection, reducing patient discomfort and risk of injury, allowing for secure and complete self-administration of injections.
Implementation Method 1
biasing means for causing the safety shield to move, from its rest position, to its activation position
Implementation Method 2
specific isolating means in the device of the invention, the patient does not feel the force of the biasing means during the step of moving the safety shield
Data Source
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Figure 5
AI summary
The present invention relates to a device (1) for automatic injection of a product (3) comprising a container (2), a needle (6) and a piston (7) and, - a housing (12) receiving said container (2), said container (2) being movable with respect to said housing (12) between an initial position and an insertion position, distally spaced relative to said initial position,, - a safety shield (8) coupled to said housing (12) and movable with respect thereto between a rest position, an activation position, proximally spaced relative to said rest position, and a safety position, distally spaced with respect to said rest position, - biasing means (33) for causing the movement of said safety shield (8) to said safety position, - triggering means (29) for causing the container (2) to move from its initial position to its insertion position, said triggering means (29) being releasable by movement of said safety shield (8) to said activation position, characterized in that said device (1) further comprises; isolating means (24) for isolating said safety shield (8) from said biasing means (33) when said safety shield (8) is moved to its activation position.