Safety Needle Locking Mechanism Using Segmented Guiding Channel
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Solution Overview
Problem
Conventional safety needles have insufficient locking capability and safety effect, allowing the needle cap to be moved backward due to external forces, compromising the safety mechanism and making it possible to reuse the needle.
Innovation Solution
A safety needle design featuring a needle housing with guiding check channels and a resilient block that telescopically moves and rotates, using a spiral resilient member to lock the needle cap in place after use, preventing reverse movement and ensuring the needle cannot be reused.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional safety needle uses a guiding recess with straight segment, guiding segment, and locking segment, then the needle cap can be moved into the needle base to expose the needle during injection, but the locking capability is insufficient allowing the needle cap to be moved backward due to external forces
Solution Approach 1:
The guiding check channel is divided into four distinct segments: straight segment, locking segment, inclined guiding segment, and end segment. Each segment performs a specific function in controlling the resilient block's movement, providing sequential guidance, locking, directional control, and final positioning to ensure reliable one-way movement of the needle cap
Solution Approach 2:
The resilient block acts as an intermediary element that interacts with the guiding check channel segments. It transmits the movement forces between the needle cap and the channel structure, enabling controlled telescopic movement while preventing reverse motion through its engagement with the check tab and segmented channel geometry
2Object-affected harmful factors
If the outer cap is mounted around the needle assembly to provide safety effect, then the needle is protected from exposure, but the user cannot recognize whether the safety needle has been used or not by appearance
Solution Approach 1:
The patent employs visual indicators that change appearance based on usage state. The needle cap's position relative to the needle housing, controlled by the resilient block mechanism, creates visible differences in the assembled structure that allow users to distinguish between used and unused needles without disassembly
3Object-affected harmful factors
If the needle cap is pushed to move out of the needle base after injection to cover the needle, then the safety effect is maintained, but the needle cap may be moved backward due to external force compromising safety
Solution Approach 1:
The guiding check channel's locking segment and check tab are designed to preemptively prevent backward movement of the resilient block. The geometric constraints and mechanical interference features create inherent resistance against reverse forces before they can compromise the needle cap's protective position
Solution Approach 2:
The mechanism transitions from a static locking structure to a dynamic system where the resilient block can move freely in the forward direction (during injection) but becomes constrained by the check tab and locking segment geometry in the reverse direction, providing adaptive stability based on operational state
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 effectively locks the needle cap within the housing, preventing reuse and maintaining safety by using the guiding check channels and resilient block to control the needle's exposure and enclosure, enhancing the safety and hygiene of the needle device.
Implementation Method 1
at least one resilient block formed on a rear end of the needle cap and extending respectively into the at least one guiding check channel
Implementation Method 2
a resilient member connected between the needle cap and the positioning portion and mounted around the needle connection portion
Data Source
AI summary
A safety needle (10) and a safety needle device (1). The safety needle device (1) comprises the safety needle (10), an outer protective cover (60), and a sealing membrane (70). The outer protective cover (60) cooperates with the sealing membrane (70) to seal and package the safety needle (10). The safety needle (10) comprises a needle sleeve housing (20), a syringe assembly holder (40), a needle (30), and an elastic safety cover (50). The syringe assembly holder (40) is provided at a rear end of the needle sleeve housing (20). The needle (30) is movably provided inside the needle sleeve housing (20) and the syringe assembly holder (40). The elastic safety cover (50) is provided in the needle sleeve housing (20) so as to be capable of rotating and extending and retracting. A non-return guide slot (23) having a non-return elastic plate (235) in the needle sleeve housing (20) guides a needle sheath elastic engagement component (55) of a needle sheath (51) of the elastic safety cover (50) such that the elastic safety cover (50) can extend and retract in an axial direction of the needle sleeve housing (20) and control the timing of the extension of the needle (30) outside the elastic safety cover (50). After use, the elastic safety cover (50) covering an outer side of the needle (30) can be stopped and locked in the needle sleeve housing (20) by the non-return elastic plate (235) such that the safety needle (10) cannot be used again, thus ensuring safety of use.