Syringe Cap Reuse Prevention Structure
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Solution Overview
Problem
Conventional syringe caps for preventing reuse are limited in application, difficult to use, and pose safety risks due to the complexity of breaking the connection between the upper and lower bodies, which is typically achieved by twisting, leading to the formation of sharp burrs and potential hand injuries.
Innovation Solution
A syringe cap with a reuse prevention structure featuring a fixed body and a separable body connected by a connection breakable portion that can be broken through rotation and pushing motion, ensuring easy separation and preventing reuse by visual inspection of the broken connection, with a tapered shape to minimize burr formation and a design that stabilizes the fixed body on the syringe barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper body and lower body are connected by breakable portions that require twisting motion to break, then the syringe cap can prevent reuse, but the breaking operation becomes difficult and may cause safety accidents due to sharp burrs
Solution Approach 1:
The patent changes the breaking mechanism from requiring twisting motion to requiring only pulling motion. The connection breakable portion is designed with a tapered shape where the lower end has a smaller diameter than the upper end, creating a stress concentration point that breaks easily when pulled apart, eliminating the need for complex twisting operations and preventing sharp burr formation.
Solution Approach 2:
Instead of designing the breakable portion to break through twisting (conventional approach), the patent inverts the approach by designing it to break through simple pulling motion. The tapered geometry is configured so that the breaking force is applied in the opposite direction of conventional designs, making the operation safer and easier while maintaining reuse prevention functionality.
2Reliability
If the breakable portions are designed to be broken by twisting the upper body upward and downward, then reuse can be prevented, but the structure becomes complex and difficult to use for new users
Solution Approach 1:
The patent simplifies the breaking mechanism by changing the geometric parameters of the connection breakable portion. The tapered shape with a smaller lower end diameter creates a natural stress concentration point that requires only simple pulling motion to break, eliminating the need for complex twisting mechanisms and making the design easier to understand and use.
3Ease of operation
If the connection breakable portion is broken by twisting motion, then the syringe cap can be opened, but sharp burrs are formed on the top of the lower body causing safety accidents
Solution Approach 1:
The patent inverts the breaking direction and mechanism. Instead of twisting that creates lateral stress and burrs, the design uses a tapered connection breakable portion that breaks cleanly through vertical pulling motion. The tapered geometry ensures the break occurs at the smaller lower end without creating sharp burrs that could injure the user.
Solution Approach 2:
By changing the geometric parameters of the connection breakable portion to a tapered shape with a smaller lower end diameter, the patent ensures clean breaking without burr formation. This parameter change transforms the breaking process from a harmful twisting motion to a safe pulling motion that produces clean breaks.
Data Source
AI summary
Disclosed is a syringe cap having a reuse prevention structure, including a reuse prevention cover which fixes a fixed body to the front end of a syringe barrel by fusion or welding, combines a separable body with the fixed body by a screw, and entirely covers the separable body and the fixed body, wherein the reuse prevention cover includes an upper body and a lower body. The upper body and the lower body are connected to each other by a connection breakable portion, and the connection breakable portion is broken by rotating the upper body in one direction relative to the lower body such that the upper body and the separable body are separated from the lower body and the fixed body, respectively. In addition, the connection breakable portion is easily broken by the twisting of the reuse prevention cover, and by the pushing-up motion of the separable body.