Resilient Ring Fastening Element for Syringe Retention
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Solution Overview
Problem
Fastening elements for syringes or cartridges often have inadequate retaining forces, leading to unintended detachment during transport or handling, which can result in medication loss or patient harm due to contamination.
Innovation Solution
A fastening element with a ring element having two resiliently connected wall portions that enclose a free space, providing flexibility and secure fixation on the syringe or cartridge extension piece, utilizing a two-component injection molding technique with harder and softer plastics for enhanced stability and frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional fastening element with a single ring element is used, then the device complexity is low, but the retaining force is inadequate leading to unintended detachment
Solution Approach 1:
The ring element is divided into two resilient wall portions (first and second wall portions) that are articulated to each other. This segmentation allows each wall portion to independently deform and engage with the extension piece, significantly increasing the retaining force while maintaining a relatively simple overall structure.
Solution Approach 2:
The two wall portions are designed to be resilient and movable relative to each other through articulation. This dynamic structure allows the ring element to adapt to the extension piece geometry, providing enhanced gripping force and secure retention while accommodating variations in the extension piece dimensions.
2Reliability
If the ring element is made rigid to ensure stable fixation, then the reliability of fixation improves, but the adaptability to different extension piece geometries decreases
Solution Approach 1:
The wall portions are designed with resilient properties that allow them to change their physical state between a deformed state during mounting and a stabilized state during fixation. This parameter change enables the structure to adapt to different extension piece geometries while maintaining reliable fixation once mounted.
Solution Approach 2:
The articulated connection between the two wall portions creates a dynamic structure that can adapt to various extension piece shapes and sizes. The resilience of the wall portions allows them to deform during mounting and then stabilize in a configuration that provides reliable fixation for the specific extension piece geometry.
3Adaptability or versatility
If the ring element is made flexible to accommodate different geometries, then the adaptability improves, but the retaining force may become inadequate
Solution Approach 1:
By segmenting the ring element into two articulated wall portions, each portion can independently deform to accommodate the extension piece geometry, providing adaptability. Simultaneously, the combined action of both wall portions creates multiple contact points and engagement mechanisms that significantly increase the overall retaining force.
Solution Approach 2:
The fastening element combines resilient wall portions with a rigid main body, creating a composite structure. The resilient wall portions provide adaptability and gripping force, while the rigid main body maintains structural integrity and provides the threading mechanism, achieving both flexibility and strength.
4Reliability
If a two-component injection molding technique is used with harder and softer plastics, then the frictional forces and stability improve, but the manufacturing complexity increases
Solution Approach 1:
The use of two-component injection molding with harder and softer plastics creates a composite structure where the softer material provides high frictional forces for secure gripping, while the harder material ensures structural stability. This composite approach achieves superior fixation reliability through a single integrated manufacturing process.
Solution Approach 2:
The two-component injection molding technique merges the manufacturing of the harder and softer plastic components into a single integrated process. This combining of materials and operations achieves complex functional requirements (friction and stability) while actually simplifying production by eliminating separate assembly steps for different components.
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
Ensures reliable and secure attachment of the fastening element to the syringe or cartridge, preventing accidental detachment during transport and handling, thereby preventing contamination and ensuring the integrity of the medication.
Implementation Method 1
the first wall area is connected resiliently to the main body
Implementation Method 2
components made of harder and softer plastic are used. The components made of softer plastic ensure high frictional forces on the outer face of the extension piece
Data Source
AI summary
A fastening element is proposed for fixing an attachment element on an extension piece of a syringe or a carpule, said extension piece having, on an outer face, at least one projection, wherein the fastening element (1) has an annular main body (3) on which a ring element (13) is articulated such that the ring element engages around the extension piece in a mounted state. The ring element has an annular first wall portion (15), which is articulated on the main body (3) via a first bearing area (19), and has an annular second wall portion (17), which is articulated on the first wall portion (15) via a second bearing area (21), wherein the first and second wall portions (15) and (17) are preferably connected to each other resiliently and enclose between them a free space (23), and wherein the first wall portion (15) is connected resiliently to the main body (3).