Tail Pressing Safety Lancet Locking Mechanism
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Solution Overview
Problem
The existing tail pressing type disposable safety lancets cannot be reliably identified as used or reused, posing safety concerns and user experience issues due to their design.
Innovation Solution
Incorporating an active locking part on the tail cover and a passive locking part on the elastic arm, ensuring that the lancet core cannot be reloaded after use by creating a locking mechanism that visually distinguishes used devices and prevents reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tail cover completely rebounds after being pressed, then the ejection mechanism functions properly, but the forms before and after use cannot be directly identified from the appearance
Solution Approach 1:
The patent applies a limiting groove structure that creates a visible positional difference between used and unused states. When the tail cover is pressed and the lancet core is ejected, the tail cover moves forward along the limiting groove, creating a visible gap or position change that indicates the device has been used. This visual indication solves the problem of无法 identifying usage status while maintaining proper ejection function.
2Reliability
If the safety lancet is designed as disposable, then safety is improved, but the lancet core can still be loaded and used again if pushed back from the front needle outlet hole
Solution Approach 1:
The patent segments the locking function into two distinct mechanisms: an unlocking mechanism (bevel on tail cover forcing elastic arm to open) and a locking mechanism (limiting groove preventing tail cover rebound). This segmentation ensures that while the lancet core can be ejected, the tail cover cannot return to its original position, making reloading impossible and ensuring true disposable safety.
Solution Approach 2:
The limiting groove structure is pre-designed to prevent the tail cover from rebounding to its initial position after ejection. This preliminary structural constraint ensures that even if someone attempts to reload the lancet core by pushing it back from the front, the tail cover's forward position along the limiting groove prevents proper re-locking, thus preventing reuse before it can occur.
3Ease of operation
If the tail cover is pressed to trigger ejection, then the lancet core is ejected and puncturing occurs, but the tail cover cannot be prevented from completely rebounding
Solution Approach 1:
The limiting groove acts as an intermediary structure between the tail cover and the shell. It allows the tail cover to move forward during ejection (maintaining ease of operation) but prevents it from rebounding completely (ensuring disposable safety). The groove mediates the motion of the tail cover, permitting forward movement while blocking backward movement, thus resolving the contradiction between operational ease and safety reliability.
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
Ensures the safety lancet is truly disposable, enhancing user safety and experience by preventing re-use and providing a clear visual indication of usage status.
Implementation Method 1
the front end of the spring presses against the lancet core
Implementation Method 2
the spring acts on the lancet core to push it forward
Implementation Method 3
the elastic arm is provided with a hook or end face for locking the lancet core
Data Source
AI summary
A tail pressing type disposable safety lancet includes a shell, a lancet core, a spring and tail cover. The shell has an elastic arm for locking the lancet core, wherein: the tail cover has an active locking part for locking and the elastic arm has a passive locking part for locking correspondingly; the positions, the fitting time of the active locking part and the passive locking part correlate with the active and passive unlocking parts; when the tail cover is pressed during use, it forces the lancet core to unlock for ejection and puncturing, and the tail cover and elastic arm enter the locking state and cannot be used again. After use of the safety lancet, the tail cover permanently locks on the elastic arm of the shell, ensuring the safety of single use, and the user visually recognizes the tail cover is retracted at the tail of the shell.