Autoinjector Radial Retaining Element for Spring Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing autoinjectors for administering fluid substances are complex and have many components, making them cumbersome and difficult to manufacture.
Innovation Solution
A simplified autoinjector design featuring a compact housing with a few key components, including a product container with a plug and needle, a needle protection element with a spring, and an injection spring that works directly with the plug to administer the substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional autoinjector design with multiple components is used, then reliable substance administration is achieved, but device complexity increases and manufacturing becomes difficult
Solution Approach 1:
The patent combines multiple functional components into a unified structure. The holding element integrates the injection spring retention function and the plug retention function into a single component that interacts with both the injection spring and the plug simultaneously, reducing the total number of parts while maintaining reliable substance administration
Solution Approach 2:
The holding element serves multiple functions: it holds the injection spring in the pre-tensioned state, retains the plug in the product container, and facilitates the coordinated movement of both components during administration. This multi-functionality reduces device complexity while ensuring reliable operation
2Device complexity
If a simplified autoinjector design with fewer components is used, then device complexity is reduced and manufacturing becomes easier, but substance administration performance may be compromised
Solution Approach 1:
The injection spring is pre-tensioned in the holding element before use, storing the energy required for substance administration. The holding element is designed to maintain this pre-tensioned state until activation, ensuring that all necessary energy and mechanical preparation are completed in advance for efficient substance delivery
Solution Approach 2:
The holding element is designed to be radially movable, transitioning from an engagement position where it retains both the injection spring and plug to a release position where it allows their coordinated movement. This dynamic capability enables the simplified structure to achieve effective substance administration through controlled radial movement rather than requiring complex multi-component mechanisms
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 achieves a high administration performance with a compact design, reduced complexity, and fewer components, resulting in a robust and easy-to-use autoinjector.
Implementation Method 1
The needle protection spring and the injection spring are designed to be tensioned and relaxed. The force of the needle protection spring causes the needle protection element to be displaced from the distal position to the proximal position
Implementation Method 2
The force of the injection spring causes the injection spring to discharge the entire amount of the substance to be administered or a partial amount of the substance to be administered
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a device for administering a fluid substance. The device according to the invention comprises a housing (1), a housing-fixed retaining element (6; 6') in which an injection spring (5) is received. The retaining element (6; 6') can be radially movable outwards or radially deflected between an engagement position, in which the retaining element (6; 6') is engaged with the injection spring (5), and a release position, in which the retaining element (6; 6') is disengaged from the injection spring (5). During an axial movement of a needle guard element (3) from the distal position to the proximal position, the retaining element (6; 6') can disengage from the injection spring (5) in order to administer the substance from the product container (2) through the needle (2b).