Safe Insulin Needle Assembly With Anti-Unlocking Sleeve Structure
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Solution Overview
Problem
The existing safe insulin needle assembly lacks stability in the structure between the needle holder and safety protection sleeve, leading to a risk of the safety protection sleeve being unlocked.
Innovation Solution
A safe insulin needle assembly design featuring a protection sheath, safety protection sleeve, pressure seat, and needle holder, with specific structural elements such as annular steps, vertical bars, and flanges to ensure axial and rotational stability, preventing unintended unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple locking structure is used between the safety protection sleeve and needle holder, then the device complexity is reduced, but the stability and reliability of the locking mechanism deteriorates, leading to potential unintended unlocking
Solution Approach 1:
The locking mechanism is divided into multiple independent position-limiting elements: position-limiting protrusions on the safety protection sleeve and corresponding position-limiting grooves on the needle holder. This segmentation allows each element to independently contribute to the overall locking stability without requiring a complex integrated structure.
Solution Approach 2:
The safety protection sleeve is nested over the needle holder, with the locking mechanism integrated within the nested structure. The position-limiting protrusions and grooves are formed as integral parts of the nested components, eliminating the need for separate locking parts and reducing overall device complexity while maintaining reliability.
2Reliability
If multiple position-limiting structures are added to prevent unintended unlocking, then the locking stability is improved, but the device complexity increases
Solution Approach 1:
The position-limiting function is merged with the structural design of the safety protection sleeve and needle holder themselves. The position-limiting protrusions and grooves are formed as integral features of these components rather than as separate added elements, thereby providing enhanced locking stability without proportionally increasing device complexity.
Solution Approach 2:
The position-limiting protrusions and grooves serve multiple functions: they provide locking stability, guide the relative movement between the safety protection sleeve and needle holder, and prevent unintended unlocking. This multi-functionality reduces the need for additional dedicated components.
3Ease of operation
If the safety protection sleeve is designed to be easily removable, then the ease of operation is improved, but the risk of accidental unlocking increases
Solution Approach 1:
The position-limiting protrusions are designed with asymmetric geometry, having specific orientations and shapes that allow intentional removal by the user while preventing accidental removal. The asymmetric design creates a specific engagement pattern that requires deliberate user action to disengage, thereby maintaining anti-unlocking reliability while preserving ease of intentional operation.
Data Source
AI summary
Safe insulin needle assembly includes protection sheath, needle, safety protection sleeve, pressure seat and needle holder. The needle is arranged on the central axis of the needle holder. The pressure seat is sheathed over the upper portion of the needle holder. The safety protection sleeve is sheathed on the needle holder and the pressure seat as a whole. The upper protection of the safety protection sleeve is connected to and cooperates with the pressure seat. The needle protrudes out of the top end of the upper portion of the safety protection sleeve. The lower portion of the safety protection sleeve is connected to and cooperates with the lower portion of the needle holder. The protection sheath is sheathed on the safety protection sleeve and the needle as a whole. The lower portion of the protection sheath is connected to and cooperates with the lower portion of the safety protection sleeve.