Syringe Accessory With Distal Wall For Needle Retention
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Solution Overview
Problem
Existing syringe accessories fail to securely attach needles to syringe bodies during injections of viscous products, leading to potential separation and tissue damage due to longitudinal stress, and often result in needle damage or contamination during assembly.
Innovation Solution
A semi-tubular accessory with a distal transverse wall and a bearing zone that secures the needle adapter against the wall, preventing rotation and pivoting, and an elastic zone for accommodating different syringe lengths, allowing easy engagement and preventing pre-loading complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nut is fitted over the needle and screwed onto the tubular element to retain the needle, then the needle can be held on the syringe body under longitudinal stress, but the needle may become damaged or contaminated during the fitting process
Solution Approach 1:
The invention removes the nut component from the assembly, replacing it with a semi-tubular body that directly engages with the syringe body. This extraction of the nut eliminates the harmful action of fitting a separate component over the needle, thereby preventing needle damage or contamination while maintaining retention functionality through the bearing surface and friction engagement
Solution Approach 2:
The invention combines the functions of the tubular element and nut into a single integrated semi-tubular body. The body simultaneously provides structural support, engagement with the syringe body via the bearing zone, and retention of the needle through the distal transverse wall and friction, eliminating the need for separate components and their associated assembly risks
2Reliability
If a tubular element with screw thread and nut assembly is used to secure the needle, then the needle can be retained under stress, but the structure becomes relatively complex and requires preloading the syringe
Solution Approach 1:
The invention merges multiple components (tubular element, screw thread, nut, retaining ring) into a single semi-tubular body structure. This unified structure integrates the bearing zone for syringe engagement and the distal transverse wall for needle retention, dramatically simplifying the device while maintaining all necessary retention functions under longitudinal stress
Solution Approach 2:
The semi-tubular body performs multiple functions simultaneously: it provides structural support, engages with the syringe body through the bearing zone, retains the needle via the distal transverse wall and friction, and eliminates the need for separate nuts or retaining rings. This multi-functionality reduces overall device complexity while ensuring reliable needle retention
3Reliability
If a nut is screwed onto the tubular element to retain the needle, then the needle can be held secure, but the manufacturing cost and usage cost increase
Solution Approach 1:
The invention combines multiple separate components into a single semi-tubular body that can be manufactured as one piece, particularly by molding in a synthetic material. This integration eliminates the need for assembling multiple parts, reducing manufacturing complexity and cost while maintaining effective needle retention through the integrated bearing zone and distal transverse wall structure
Solution Approach 2:
The semi-tubular body is advantageously made as a single piece that can be manufactured at low cost, potentially as a disposable component. This approach reduces both manufacturing and usage costs compared to complex multi-component assemblies requiring precise assembly and potential reusability, while ensuring reliable needle retention for the intended application
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 accessory securely holds the needle during injections, preventing separation and damage, simplifies assembly, reduces manufacturing costs, and ensures easy engagement without risking needle contamination or damage.
Implementation Method 1
the bearing of the connecting adapter against said distal transverse wall generates friction between this adapter and this wall, and this is able to prevent the needle from pivoting when the latter is connected to the syringe body by a screwed connection
Implementation Method 2
these two parts being connected to one another by an elastic zone that can be stretched in the longitudinal direction of the accessory
Data Source
AI summary
According to the invention, the accessory (1) comprises a body (15) of roughly semi-tubular shape, first means of holding the syringe comprising a distal transverse wall (20) connected to one end of said body (15), and pierced with a hole (22) for the passage of the needle (7) through it, and second means of holding the syringe comprising a bearing zone (61) against which the proximal flange (10) or the lateral lugs that the syringe body (5) comprises is or are intended to bear so as to provide support for the user's fingers; the distance between said distal transverse wall (20) and said bearing zone (61) is such that the adapter (8) connecting the needle (7) to the syringe body (5) is kept bearing against said distal transverse wall (20) when said flange (10) or said lateral lugs are bearing against said bearing zone (61).