Disposable Injection Needle With Limit Arm Mechanism
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Solution Overview
Problem
Conventional injection needles pose infection risks due to exposed needle tips and unstable assembly with insulin injection pens, leading to potential cross-infection and poor handling conditions.
Innovation Solution
A disposable injection needle design featuring a needle mount with a tube needle, a first sleeve, and a second sleeve that is axially slideable, equipped with an elastic element and a limit arm mechanism to prevent the needle tip from being exposed, ensuring secure engagement with the injection pen and preventing accidental exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the needle tip is exposed for use, then injection function is achieved, but infection risk increases and cross-contamination occurs
Solution Approach 1:
The protective sleeve is divided into a first sleeve and a second sleeve that can move relative to each other. The first sleeve provides initial protection, while the second sleeve can be retracted to expose the needle tip for injection, then restored to cover it afterward. This segmentation allows the system to transition between protected and exposed states, achieving both safety and functionality.
Solution Approach 2:
The protective sleeves are pre-positioned to cover the needle tip before use. The limit arm mechanism is pre-configured with a limit groove that automatically guides the second sleeve's retraction and restoration, ensuring the needle is protected during storage and transport, and only exposed when intended for injection.
2Device complexity
If the big sleeve slides outside the needle mount during engagement, then assembly becomes unstable, but the structure becomes simpler
Solution Approach 1:
The limit groove is pre-formed in the first sleeve at the correct position. When the second sleeve is pushed during engagement, the limit arm automatically engages with this pre-positioned limit groove, preventing the big sleeve from sliding outside the needle mount and ensuring stable assembly without requiring complex additional components.
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 prevents needle tip exposure after use, enhancing safety by reducing infection risks and ensuring stable assembly with insulin injection pens, thus improving user safety and handling conditions.
Implementation Method 1
an elastic element adapted to provide elastic force for the second sleeve to move axially toward outside the receiving space
Data Source
Figure 1a~2d
Figure 3a~4f
Figure 5~7b
AI summary
The present disclosure relates to a disposable injection needle including: a needle mount having a tube needle; a first sleeve, one end of which is suitable for connecting to the needle mount to define receiving space, and the other end of which is provided with a first opening; a second sleeve, one end of which is located inside the receiving space, and the other end of which having a second opening, wherein the second sleeve is provided in an axially slideable manner; an elastic element adapted to allow the second sleeve moves axially toward outside the receiving space, wherein: the needle mount or the first sleeve is provided with a stop surface and a limit groove; the second sleeve is provided with a limit arm comprising a limit face and a protruding member which is adapted to enter the limit groove with axial relative movement between the first sleeve and the second sleeve; the limit face has a first radial location and a second radial location, the location of the limit face is adapted to be changed radially based on elastic deformation of the limit arm; in the first radial location, the limit face is adapted to pass axially the stop surface, and in the second radial location, the limit face is adapted to abut against the stop surface to prevent the second sleeve from moving axially further toward inside the receiving space.