Disposable Safety Lancet Prevents False Triggering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing head pressing type disposable safety lancet is prone to false triggering due to vibration and accidental touching, leading to premature failure and accidental injuries.
Innovation Solution
The design incorporates a protective rod with a stopper and an elastic arm with blocking and resisting surfaces, a sliding platform, and a launching spring to prevent accidental triggering, allowing the lancet to return to its initial state after false triggering, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple ejection structure is used in head pressing type disposable safety lancet, then the device has fewer parts, lower manufacturing cost, and simpler structure, but it is prone to false triggering due to vibration and accidental touching
Solution Approach 1:
The elastic arm is pre-configured with blocking and resisting surfaces that engage with the pusher and housing respectively. This preliminary arrangement ensures that the lancet cannot be accidentally ejected unless the specific triggering action is performed, thus preventing false triggering while maintaining structural simplicity
Solution Approach 2:
The elastic arm acts as an intermediary mechanism between the pusher and the lancet. It transfers the triggering force from the pusher to the lancet through its blocking and resisting surfaces, providing a reliable connection that prevents accidental activation while maintaining the simplicity of the overall structure
2Ease of operation
If the pusher is made easily accessible for operation, then the ease of operation is improved, but the risk of accidental triggering increases
Solution Approach 1:
The blocking surface on the elastic arm and the resisting surface on the housing are pre-positioned to create a mechanical interlock. This preliminary configuration allows the pusher to be easily accessible for intentional operation while preventing accidental triggering, as the specific triggering action is required to overcome the pre-set mechanical barrier
Solution Approach 2:
The elastic arm provides localized mechanical engagement at specific points (blocking surface and resisting surface) rather than requiring complex global locking mechanisms. This localized quality approach maintains ease of operation by keeping the pusher accessible while providing targeted protection against accidental triggering
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 solution effectively prevents accidental triggering, maintaining the advantages of fewer components, low manufacturing cost, and good working reliability while enhancing safety, thus addressing the safety issues of the original ejection structure.
Implementation Method 1
a triggering surface is provided on the inner wall of the housing corresponding to the resisting surface, the triggering surface cooperating with the resisting surface to force the elastic arm to bend towards inner side
Implementation Method 2
the front end of the needle core is equipped with a protective rod, and the side of the needle core is equipped with an elastic arm
Data Source
AI summary
A safety lancet includes a housing, a needle core, a pusher and a launching spring, the front end of the needle core having a protective rod, the side of the needle core having an elastic arm having a protrusion; a sliding platform is provided for the protrusion on the inner wall of the housing, and the front end face of the sliding platform is the triggering surface for triggering launching the lancet, and the tabletop of the sliding platform is a sliding surface in the length direction of the lancet; the distance of the decoupling point of the projection relative to the center of the lancet is greater than or equal to the distance of the sliding surface relative to the center of the lancet; a stopper is on the protection rod, and corresponding to the stopper a second limit surface is on the inner wall of the pusher.