Expandable Ring Syringe Carrier for Autoinjector Stability
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Solution Overview
Problem
Existing syringe carriers for medicament delivery devices, such as autoinjectors, face challenges in providing even support to syringes with rigid needle shields, leading to potential dislocation of the needle during use and tangling issues during assembly and transport.
Innovation Solution
The introduction of an expandable ring or non-circular ring design in the syringe carrier that expands to accommodate the syringe, providing even support and reducing tangling, with features like hinges and segments allowing the ring to flex and contract to securely hold the syringe in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed circumference base section is used to support the syringe, then the syringe carrier provides stable support, but it cannot accommodate syringes with rigid needle shields that require even radial support
Solution Approach 1:
The syringe carrier employs an expandable ring structure that transitions from a contracted state during assembly to an expanded state during operation. The ring includes flexible segments connected by hinges that allow radial expansion to contact the rigid needle shield, providing even circumferential support while maintaining structural stability. This dynamic transformation enables the carrier to adapt to different syringe configurations.
Solution Approach 2:
The expandable ring is divided into multiple discrete segments that can independently flex and expand. Each segment is connected to adjacent segments through hinges, allowing the ring to expand radially while maintaining structural integrity. This segmentation enables the ring to conform to the cylindrical shape of the rigid needle shield and provide uniform support around the entire circumference.
2Ease of manufacture
If traditional syringe carriers are used, then assembly is simple, but syringe carriers get tangled together during bulk transport and sorting
Solution Approach 1:
The expandable ring maintains a contracted configuration during transport and storage, minimizing its volume and preventing tangling with other carriers. When a syringe is inserted, the ring automatically expands to its operational size. This dynamic size change eliminates the tangling problem while maintaining simple assembly procedures.
3Reliability
If the ring expands to accommodate the rigid needle shield, then even support is provided, but the ring structure becomes more complex
Solution Approach 1:
The expandable ring is constructed from flexible material that can bend and expand radially. The flexible segments and hinges allow the ring to transform from a compact transport state to an expanded operational state, providing even radial support for the rigid needle shield. This flexible construction achieves the support function with relatively simple structural elements.
Data Source
AI summary
This application describes syringe carriers for medicament delivery devices such as autoinjectors. In particular, an example syringe carrier is tubular and extends along a longitudinal axis from a proximal end to a distal end, the syringe carrier comprising a base section at the distal end of the syringe carrier, the base section having a fixed circumference, at least one arm extending towards the proximal end of the syringe carrier from the base section, and an expandable ring attached to the proximal end of the at least one arm, wherein the ring extends entirely around the longitudinal axis of the syringe carrier in the circumferential direction. Various other syringe carriers and associated medicament delivery devices and methods are described.