Autoinjector Syringe Holder With Expansion Joint for Bypass Insertion
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Solution Overview
Problem
Existing syringe holders for medicament delivery devices like autoinjectors face difficulties in inserting syringes without damaging the holder, particularly when syringes with bypasses are used, leading to potential breakage and increased stress on assembly tools.
Innovation Solution
The syringe holder design incorporates a tubular body with features such as cut-outs, recesses, and flexible expansion joints to alleviate stress during syringe insertion, reducing the risk of breakage and extending tool life by allowing for easier assembly and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid syringe holder structure is used, then structural strength is maintained, but stress concentration occurs during syringe insertion leading to breakage
Solution Approach 1:
The syringe holder is divided into multiple segments including a proximal portion, a distal portion, and an expansion joint connecting them. This segmentation allows each part to perform its specific function while reducing stress concentration on any single component during syringe insertion.
Solution Approach 2:
The expansion joint introduces dynamic flexibility to the otherwise rigid syringe holder structure. It allows the holder to expand and flex during syringe insertion, particularly accommodating syringes with bypasses, thereby preventing stress concentration and breakage while maintaining overall structural strength.
2Manufacturing precision
If a rigid syringe holder structure is used, then manufacturing precision is maintained, but assembly difficulty increases due to stress on tools
Solution Approach 1:
Dividing the holder into proximal and distal portions connected by an expansion joint allows each section to be manufactured with high precision independently, while the flexible joint accommodates minor variations and reduces assembly stress.
Solution Approach 2:
The expansion joint changes the physical parameters of the holder from completely rigid to partially flexible, allowing it to deform elastically during assembly to accommodate syringes with bypasses, thereby reducing stress on assembly tools while maintaining manufacturing precision.
3Ease of operation
If the syringe holder is made more flexible to accommodate bypasses, then ease of insertion improves, but structural stability may be compromised
Solution Approach 1:
The holder is segmented into rigid proximal and distal portions that maintain structural stability, connected by a flexible expansion joint that provides the necessary compliance for easy insertion of syringes with bypasses.
Solution Approach 2:
The expansion joint acts as a flexible element within the holder structure, allowing controlled deformation to accommodate syringe bypasses during insertion, while the overall tubular structure maintains its stability and integrity.
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 design reduces stress on the syringe holder and tools, minimizing breakage and enhancing the longevity of assembly tools by providing flexibility and accommodating syringe bypasses, thereby facilitating easier insertion and reducing distortion during transport and storage.
Implementation Method 1
a flexible expansion joint extending across the cut-out in the circumferential direction. Preferably, the expansion joint is configured to flex in the circumferential direction
Data Source
AI summary
A syringe holder for an autoinjector is presented having a tubular body extending around an axis in a circumferential direction and along the axis in an axial direction, the tubular body having a cut-out extending from a distal end of the tubular body and a flexible expansion joint extending across the cut-out in the circumferential direction. The tubular body can also have an inner surface and an outer surface, a first cut-out in the tubular body, the first cut-out extending in an axial direction from a proximal end of the tubular body and either a recess in the inner surface of the tubular body, the recess extending in the axial direction from the distal end of the tubular body, or a second cut-out in the tubular body, the second cut-out extending in the axial direction from a distal end of the tubular body.