Blood Collection Needle Cover Locking Structure Against Push-Out
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Solution Overview
Problem
Existing blood collection devices lack effective mechanisms to prevent needle sticks due to hooks with insufficient elasticity, leading to accidental needle exposure and increased risk of puncture or infection, and lack visibility on needle fixation within protective covers.
Innovation Solution
A needle stick injury prevention device featuring a vacuum bottle support tube with a clamping portion and spring sheets, and a protective cover with spring sheets and barbs, which adjust to resist external forces, ensuring the needle cover remains secured, and a needle seat with a flange to confirm internal fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hook is used to connect the protective cover to the cover body, then the structure is simple, but the hook lacks elasticity and cannot bear external force, causing the needle to slip out
Solution Approach 1:
The patent changes the material parameter of the hook from rigid to elastic by using an elastic material. This allows the hook to deform and recover, enabling it to bear external forces and maintain reliable connection between the protective cover and cover body, preventing needle slip-out while keeping the structure simple.
Solution Approach 2:
The patent introduces dynamic characteristics to the hook by making it elastic, allowing it to adapt to external forces through deformation. This dynamic property enables the hook to maintain connection under varying conditions, improving reliability without complicating the overall structure.
2Reliability
If a fixed connection mechanism is used to secure the needle, then needle fixation is improved, but the user cannot identify whether the needle seat is fixed inside the protective cover
Solution Approach 1:
The patent uses visual indicators (such as color changes or visible markers) on the protective cover to show the needle fixation status. When the needle seat is properly fixed inside the protective cover, the indicator displays a specific visual state, allowing users to easily identify the fixation status without adding complex mechanisms.
3Stability of the object's composition
If the hook of the engaging portion is made rigid, then the structure is stable, but it cannot automatically adjust the interference area according to external force, causing separation
Solution Approach 1:
The patent changes the mechanical property of the hook from rigid to elastic, enabling it to deform under external forces and automatically adjust the interference area. This elastic property allows the hook to adapt to varying forces while maintaining structural stability through its ability to recover its original shape.
Solution Approach 2:
The patent introduces dynamic adaptability to the rigid structure by making the hook elastic. This allows the connection to automatically adjust to external forces through elastic deformation, maintaining stability under different conditions without requiring complex adjustment mechanisms.
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
Prevents accidental needle exposure by adjusting to external forces, ensuring the needle cover and steel needle remain inside the protective cover, thereby reducing the risk of puncture and infection for medical staff and waste disposal personnel.
Implementation Method 1
the bottom of the protective cover is arranged in the groove and is provided with a plurality of first spring sheets, and the outer wall of each first spring sheet has a first barb, and the first barbs abut against the arc surfaces so that the first spring sheets are stretched outward
Data Source
AI summary
A needle stick injury prevention device for blood collection device to prevent needle from being pushed out comprises a vacuum bottle support tube and a protective cover. The vacuum bottle support tube comprises a main body and a cover body, the cover body is arranged on one side of the opening of the main body and has a clamping portion with a groove and a protrusion, the groove having a positioning hole, the protrusion arranged on the bottom wall of the groove and having an arc surface. The bottom of the protective cover is arranged in the groove and has a first spring sheet, the outer side wall of the first spring sheet has a first barb, the first barb abuts against the arc surface to stretch the first spring sheet outward, and the top of the first barb abuts against the top wall of the positioning hole.