Two-Component Syringe Attachment for Secure Hold
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Solution Overview
Problem
Attachments for syringes and cartridges often fail to maintain a secure hold due to material degradation from sterilization processes or inadequate design, leading to potential detachment during handling and transport, especially when intended for sterile applications.
Innovation Solution
An attachment with a base body composed of two materials, a dimensionally stable material for durability and a softer, deformable material for secure engagement with the syringe or cartridge extension, ensuring a torsion-proof and axially secure connection through a two-component injection molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material attachment is used for securing syringes or cartridges, then the attachment can be manufactured simply, but it cannot maintain secure hold under both axial and torsional forces during sterilization and handling
Solution Approach 1:
The attachment is constructed from two different materials with distinct properties: a dimensionally stable material providing structural integrity and resistance to deformation, and a softer, deformable material that can elastically deform to engage with and lock onto the syringe or cartridge body. This composite construction allows the attachment to simultaneously resist axial pulling forces through the stable material and torsional forces through the deformable material's elastic engagement, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
Different regions of the attachment are made from materials with locally optimized properties. The dimensionally stable material is positioned in areas requiring structural support and resistance to axial forces, while the softer deformable material is positioned in engagement regions where elastic deformation is needed to secure the attachment to the syringe or cartridge. This local differentiation of material properties enables the attachment to handle multiple force types effectively without requiring a complex overall structure.
2Reliability
If heat sterilization is applied to the attachment, then sterility is achieved, but the material of the attachment may be compromised or become brittle
Solution Approach 1:
The attachment uses materials specifically selected for their thermal stability and resistance to degradation at sterilization temperatures. The dimensionally stable material is chosen to maintain its mechanical properties after exposure to heat sterilization, while the deformable material is selected to retain its elasticity and engagement capability post-sterilization. This parameter-based material selection allows the attachment to achieve sterility through heat treatment without compromising structural integrity or engagement strength.
3Reliability
If the attachment is designed with simple geometry, then manufacturing is easier, but it may not prevent twisting or accidental detachment
Solution Approach 1:
The combination of dimensionally stable and softer deformable materials creates an attachment that inherently resists twisting and accidental detachment without requiring complex geometric features. The deformable material's elastic properties allow it to conform to and lock onto the syringe or cartridge body, preventing rotation and unintended separation, while the stable material maintains the overall shape and structural support. This material-based solution achieves anti-twisting capability with relatively simple geometry, balancing reliability with ease of manufacture.
Data Source
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AI summary
The invention relates to an attachment for a syringe, carpule (81) or the like that has a distal end (91) and a terminating protrusion (79) thereon, wherein the protrusion (79) has an outer surface (83), a free end (85) and at least one recess (87) introduced into the outer surface at a distance therefrom. The attachment (1) has an annular main body (15) and can be placed on the protrusion (79). The main body (5) encloses a free space (7) into which the protrusion (79) can be introduced. The main body (5) comprises two materials, preferably consisting thereof, of which a first material is dimensionally stable and a second material is softer than the dimensionally stable first material and deformable. The main body (5) has at least one engagement region which engages with the at least one recess (87) when positioned on the protrusion (79). The attachment is characterized in that, along an imaginary circumferential line, the main body (5) has at least one first region with the first material and at least one second region with the second material, wherein the second material is deformed into the at least one recess (87) when attached to the protrusion (79), and wherein the second material is embedded into the first material.