Automatic Injection Device Inadvertent Ejection Prevention
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Solution Overview
Problem
Current automatic injection devices lack a mechanism to prevent inadvertent fluid ejection when the syringe outlet is not properly engaged with a vial adaptor or an injection site, leading to potential misuse or inefficiency.
Innovation Solution
An automatic injection device with a plunger assembly and an inadvertent fluid ejection prevention assembly that ensures fluid ejection only when the syringe outlet is correctly engaged with a vial adaptor or an injection site, utilizing a user-operable actuator button and a vial adaptor engagement assembly to facilitate controlled fluid delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the plunger assembly is made freely displaceable to enable fluid ejection, then the ease of operation is improved, but the risk of inadvertent fluid ejection increases
Solution Approach 1:
The device applies preliminary anti-action by implementing a prevention assembly that actively blocks inadvertent fluid ejection before it can occur. The blocking element is positioned to prevent plunger displacement unless specific engagement conditions are met, thereby counteracting potential harmful actions in advance.
Solution Approach 2:
The prevention assembly acts as an intermediary between the plunger assembly and the triggering mechanism. This intermediary component (blocking element) mediates the interaction by conditionally allowing or preventing plunger displacement based on whether the syringe outlet is properly engaged, thus controlling the transmission of force and motion.
2Reliability
If the inadvertent fluid ejection prevention assembly is added, then the safety is improved, but the device complexity increases
Solution Approach 1:
The prevention assembly is designed as a separable component that can be integrated into or removed from the injection device. The blocking element and engagement features are structured to be added to the existing plunger assembly without requiring complete redesign of the core injection mechanism, thereby extracting the safety function as a modular addition.
Solution Approach 2:
The prevention assembly is segmented into distinct functional elements: the blocking element, the engagement features on the syringe outlet, and the control mechanism. This segmentation allows each component to perform its specific function independently while working together as a cohesive safety system, reducing overall complexity through functional decomposition.
3Reliability
If the plunger assembly is locked to prevent inadvertent ejection, then the safety is improved, but the ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be dynamic rather than static. The blocking element can transition between locked and unlocked states based on engagement conditions. When the syringe outlet is properly engaged with the injection site or vial adaptor, the block is automatically released, allowing smooth plunger displacement. This dynamic behavior ensures safety during storage and transport while maintaining ease of operation during legitimate use.
Data Source
AI summary
An injection device for injecting a fluid into an object, the injection device including a plunger assembly for operative engagement with a syringe adapted to contain the fluid and permit ejection of the fluid therefrom via a syringe outlet, the plunger assembly being displaceable in a first direction which causes at least some of the fluid contained in the syringe to be ejected from the syringe via the syringe outlet and an inadvertent fluid ejection prevention assembly coupled to the plunger assembly for preventing ejection of fluid from the syringe in situations where the syringe outlet is neither in operative engagement with a vial adaptor suitable for providing fluid communication with the interior of a vial nor in fluid communication with an injection site within the object.