Auto-Injector Rotating Cap Mixing Mechanism
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Solution Overview
Problem
Existing auto-injectors face challenges in emergency situations due to complexity, user training requirements, and potential for dosing inaccuracies and premature drug degradation, particularly in self-administration scenarios where intuitive and reliable drug preparation is needed.
Innovation Solution
A compact auto-injector design with a rotating cap that initiates mixing and signals completion through mechanical interactions, featuring axial channels and protrusions, a locking mechanism, and a spring-assisted cap separation to streamline the mixing process and maintain sterility, reducing user steps and preventing premature activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auto-injector uses multiple actuation and mixing steps, then the drug preparation can be thorough and reliable, but the device complexity increases and requires extensive user training
Solution Approach 1:
The patent combines multiple actuation and mixing steps into a single integrated mechanism. When the user performs one actuation action, the device automatically sequences through protection removal, mixing, and injection preparation, eliminating the need for multiple separate user operations while maintaining thorough drug preparation
Solution Approach 2:
The device performs automatic sequencing of mixing and preparation steps without requiring user intervention after the initial actuation. The single-mechanism design automatically manages the complex sequence of operations, reducing user training requirements while ensuring reliable drug preparation
2Duration of action of stationary object
If the drug is stored as a dry medication to extend shelf-life, then the storage stability is improved, but the device must include mechanisms to maintain sterility and prevent premature activation
Solution Approach 1:
The device segments the drug storage and activation functions into distinct components. The dry medication is stored in a separate chamber with integrated sterility protection, and the activation mechanism is designed to maintain separation until the moment of use, thereby extending shelf-life while managing complexity through functional segmentation
Solution Approach 2:
The patent applies local quality by providing sterility protection specifically at the drug storage and activation interface. The single-mechanism design incorporates localized sterility maintenance features where they are most critical, rather than requiring complex system-wide sterility management throughout the entire device
3Ease of operation
If the cap design allows easy removal for quick administration, then the ease of operation is improved, but the mechanism must prevent premature activation during storage and transport
Solution Approach 1:
The cap is pre-configured with alignment features and engagement mechanisms that guide the user through the correct removal sequence. The design incorporates preliminary protective actions during storage, where the cap and housing are pre-aligned to prevent premature activation, while still allowing easy removal when properly initiated
Solution Approach 2:
The single-mechanism design incorporates feedback elements that provide tactile or visual confirmation of proper cap removal and activation status. This feedback mechanism ensures users can easily determine when the device is ready for administration while preventing premature activation through clear state indication
Data Source
Figure 1A~1C
Figure 2A
Figure 2B
AI summary
A removable cap for use with an auto-injector device, whereupon removal of the cap triggers an actuating assembly that can cause an automatic mixing of medicament components in an auto-injector device and/or place the auto-injector in a state to be used.