Medical Needle Safety Shield Double Blocking Wall Mechanism
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Solution Overview
Problem
Existing safety apparatus for medical needles fail to fully block the cross section of the shield member connection hub, leading to potential exposure of the needle's distal end due to weak penetration resistance and interference issues during the transition from the first to the second state.
Innovation Solution
A safety apparatus with a shield member connection hub featuring a first and second blocking wall that form a double blocking wall to prevent the needle's distal end from being exposed, where the first blocking wall is a slide member and the second blocking wall is a newly formed lower wall on the connection hub, ensuring complete closure of the space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single blocking wall structure is used in the shield member connection hub, then the device complexity is reduced, but the reliability of needle shielding is insufficient due to weak penetration resistance and potential exposure of the needle distal end
Solution Approach 1:
The blocking function is segmented into two separate blocking walls (first blocking wall and second blocking wall) instead of using a single blocking wall. The first blocking wall is formed by the lower wall of the slide member, and the second blocking wall is formed by the lower wall of the shield member connection hub. This segmentation provides multiple barriers to prevent needle distal end exposure while maintaining structural clarity.
Solution Approach 2:
The solution transitions from a single-plane blocking structure to a multi-layer blocking structure by adding the second blocking wall at a different position (lower wall of the shield member connection hub) relative to the first blocking wall (lower wall of the slide member). This creates a double blocking wall configuration that blocks the cross section of the space from multiple dimensions, enhancing reliability without excessive complexity.
2Ease of operation
If the lower wall of the slide member is used as the blocking wall, then the ease of operation is improved, but the penetration resistance is insufficient because the wall is thin and the needle distal end can penetrate through
Solution Approach 1:
The blocking function is divided between two separate walls: the first blocking wall (lower wall of the slide member) that provides ease of operation, and the second blocking wall (lower wall of the shield member connection hub) that provides additional penetration resistance. This segmentation allows each wall to fulfill different functional requirements.
Solution Approach 2:
The second blocking wall is positioned in advance below the first blocking wall to provide a backup barrier. If the needle distal end penetrates through the thin first blocking wall, the second blocking wall is already in position to prevent exposure, providing beforehand cushioning against the weakness of the single thin wall structure.
3Adaptability or versatility
If the shield member connection hub structure is inserted in the fixing member connection hub, then the adaptability is improved, but interference occurs during transition from the first state to the second state, preventing proper blocking
Solution Approach 1:
The blocking walls are segmented into two independent structures: the first blocking wall associated with the slide member and the second blocking wall associated with the shield member connection hub. This segmentation allows the slide member to transition independently without interference from the shield member connection hub structure, while both blocking walls work together to achieve complete blocking.
Data Source
AI summary
In a safety apparatus for medical needles, when leg portions are extended from a first folded position to a second extended position, a distal end of a needle is introduced into a space of a shield member connection hub, and a first blocking wall and a second blocking wall overlap so as to block the cross section of the space to form a double blocking wall and blocks the cross section of the space. The double blocking wall is capable of preventing the distal end of the needle from moving downward from the double blocking wall and preventing the distal end of the needle from being exposed to the outside of the apparatus.