Deformable Ring for Axial Syringe Retention
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Solution Overview
Problem
The assembly of injection syringes into automatic injection devices is complex, particularly due to the size mismatch between the syringe and the syringe support, which can lead to stress on the syringe during use, especially when dealing with viscous medications, and requires specialized equipment for pharmaceutical laboratories.
Innovation Solution
Incorporating a deformable ring that allows the injection syringe with a removable protection cap to be assembled by inserting it axially through the syringe support, eliminating the need for assembling the support halves first and reducing stress on the syringe by retaining it at the distal end, enabling the use of stiffer springs for higher viscosity medications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the syringe support is assembled from two half-shells around the syringe, then the syringe can be securely housed, but the assembly process becomes complex and requires specialized equipment
Solution Approach 1:
The syringe support is divided into two semi-tubular half-shells that are assembled together to form a complete tubular shell around the syringe. This segmentation allows the support to be manufactured separately and then joined, simplifying the overall assembly process while maintaining secure housing of the syringe
Solution Approach 2:
The two half-shells of the syringe support are pre-assembled together before the syringe is inserted. This preliminary assembly eliminates the need for complex specialized equipment during final assembly, as the support structure is already prepared and can simply receive the syringe
2Object-affected harmful factors
If the protection cap remains on the syringe during assembly, then the needle is protected, but the cap interferes with insertion into the syringe support
Solution Approach 1:
The deformable ring changes its configuration dynamically during assembly - initially in a first configuration that allows the protection cap to pass through, and then transitioning to a second configuration that secures the syringe axially. This dynamic adaptability resolves the conflict between protecting the needle and facilitating assembly
Solution Approach 2:
The deformable ring undergoes a change in its geometric parameters - transitioning from an expanded state that accommodates the protection cap to a contracted state that provides axial retention. This parameter change allows the same component to serve dual functions: allowing cap passage and then securing the syringe
3Reliability
If the syringe is held by its flange during injection, then the syringe is retained in position, but the flange is strongly loaded and at risk of damage
Solution Approach 1:
The retention mechanism is moved from the proximal flange area to the distal end of the syringe. By engaging the syringe at its distal end rather than at the flange, the deformable ring transfers the retention function to a different location, reducing stress on the flange while maintaining reliable syringe retention during injection
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
Simplifies the assembly process, reduces the risk of syringe damage, and allows for the use of stiffer springs to inject more viscous products, enhancing the device's capability to handle a wider range of medications without compromising the syringe's integrity.
Implementation Method 1
a deformable ring, kinematically connected to the syringe support, this ring being elastically deformable between a configuration intended for the axial immobilization of the injection syringe in the syringe support and a configuration intended for the passage of the protection cap through the deformable ring
Data Source
AI summary
A part of a device for injecting a liquid product having an end sleeve and a syringe support which is able to move with respect to the end sleeve. The syringe support is designed to bear an injection syringe fitted with a removable protective cap. A deformable ring is kinematically connected to the syringe support. This ring can be deformed elastically between a configuration which is designed to axially immobilize the injection syringe in the syringe support, and a configuration designed to allow the protective cap to pass through the deformable ring.