Safe Syringe Needle Seat Dynamic Clamping Mechanism
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Solution Overview
Problem
Conventional Safe Syringes face issues with unstable needle seat positioning and increased liquid medicine residue due to difficulties in pullback mechanisms.
Innovation Solution
The Safe Syringe design incorporates a barrel with a seat mounting hole and clamping slot, a needle seat with a hook rod and linkage deformation portion, and a plunger with a hook insertion hole, allowing for stable positioning and quick pullback of the needle seat while reducing residue through a recessed chamber and flow guiding surface, along with a sealing ring for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pullback mechanism is used, then the needle seat can be retracted, but the positioning is unstable and residue increases
Solution Approach 1:
The patent employs a dynamic clamping mechanism where the clamping slot and clamped portion transition between engaged and disengaged states. During injection, the clamping slot securely holds the clamped portion for stable positioning. During pullback, the plunger head disengages the clamping portion, enabling smooth retraction. This dynamic state change resolves the contradiction by providing both stable positioning and easy pullback.
Solution Approach 2:
The patent applies local quality through the recessed chamber design at the needle seat outlet. The recessed structure creates a localized flow guidance system that directs liquid medicine completely through the needle, preventing residue accumulation in dead zones. This local structural modification ensures complete liquid discharge while maintaining overall system functionality.
2Reliability
If the needle seat is firmly clamped for stable positioning, then positioning accuracy improves, but pullback becomes difficult
Solution Approach 1:
The clamping mechanism transitions between two dynamic states: during injection, the plunger head allows the clamping slot to firmly engage the clamped portion for accurate positioning; during pullback, the plunger head moves to disengage the clamping portion, enabling easy retraction. This dynamic engagement/disengagement resolves the contradiction between firm clamping and easy pullback.
Solution Approach 2:
The clamping mechanism operates periodically, alternating between engaged and disengaged states. The first period involves engagement for stable positioning during injection; the second period involves disengagement for smooth pullback. This periodic action pattern allows the system to achieve both firm clamping and easy operation at different times in the operational cycle.
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
This design enables stable needle seat positioning, facilitates quick pullback, and effectively minimizes liquid medicine residue, improving the functionality of Safe Syringes.
Implementation Method 1
compressing the linkage deformation portion for elastic deformation such that the barrel clamping portion of the needle seat is not clamped into the seat clamping slot of the barrel
Data Source
AI summary
A safe syringe includes a barrel, a needle seat and a plunger, wherein the needle seat has a hook rod, a linkage deformation portion and a barrel clamping portion; and the plunger has a rod body, and a hook insertion hole which can be sleeved with the hook rod of the needle seat and compress the linkage deformation portion for elastic deformation such that the barrel clamping portion of the needle seat is not clamped into the seat clamping slot of the barrel, and the hook insertion hole can hook the hook rod of the needle seat to move the needle seat. The safe syringe can allow stable positioning and quick pullback of the needle seat and effectively reduce liquid medicine residue.