Syringe Needle Shield With Resilient Centering Arms and Disassembly Lock
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Solution Overview
Problem
Existing needle safety devices for syringes often fail to securely accommodate syringes with varying outer diameters due to manufacturing tolerances or design choices, and may allow for accidental disassembly, posing a risk of needle exposure.
Innovation Solution
A syringe safety device featuring a syringe housing with resilient cantilever arms that center and secure the syringe, combined with a telescopically arranged needle shield and a locking mechanism to prevent accidental disassembly, ensuring the needle remains covered after use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-diameter housing is used to accommodate syringes, then the housing structure is simple, but syringes with varying outer diameters cannot be securely accommodated
Solution Approach 1:
The housing incorporates resilient cantilever arms that can dynamically adjust their position. These arms are biased toward a first position forming a constriction, but can be deflected radially outwardly by the syringe during insertion, allowing the housing to adapt to syringes of different diameters while maintaining secure accommodation
Solution Approach 2:
The housing uses resilient arms that can change their radial position parameter. The arms transition from a retracted state (forming constriction) to an extended state (deflected outward by syringe), enabling the housing to accommodate varying syringe outer diameters through parameter change rather than fixed geometry
2Reliability
If the needle shield can be easily removed for access, then ease of operation is improved, but accidental disassembly exposing the needle becomes a risk
Solution Approach 1:
The housing includes a locking mechanism that preliminarily prevents disassembly of the needle shield. The lock engages with the shield to maintain it in the retracted position, requiring a deliberate unlocking action before the shield can be moved, thus preventing accidental exposure while allowing intentional access when needed
3Adaptability or versatility
If resilient arms are used to center syringes, then adaptability to varying syringe diameters is improved, but the risk of spontaneous disassembly increases
Solution Approach 1:
The locking mechanism preliminarily counteracts the potential disassembly force that might be generated by the resilient arms' elasticity. The lock engages with the needle shield to prevent it from moving forward unexpectedly, even when the arms are deflected, thus maintaining reliability while preserving the centering function
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 device effectively centers syringes with varying diameters and prevents accidental disassembly, providing secure needle protection by maintaining the needle shield in the extended position until intended.
Implementation Method 1
a plurality of resiliently deformable arms, each biased towards a first position... configured to be deflected radially outwardly from the first position by the syringe when the syringe is inserted into the syringe housing
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A safety device for a syringe is provided. The safety device comprises a housing having a main body configured to receive a syringe, a flange support configured to support a flange of the syringe, and prevent or limit distal movement of the syringe relative to the housing, a needle shield comprising a sleeve telescopically arranged with respect to the housing such that the needle shield can slide over the housing between an extended position in which a needle tip is covered and a retracted position in which the needle tip is exposed. The device comprises syringe centring features and/or a disassembly lock.