Injection Syringe Cap Removal Mechanism
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Solution Overview
Problem
Existing assistance devices for injection syringes require excessive force to remove protective caps, and the cap removal mechanism often fails to engage properly with the cap, posing safety and usability issues.
Innovation Solution
The assistance device features a cap removal system with independent relative engagement movement between complementary control members, allowing the extractors to engage with the cap during assembly, ensuring easy and safe cap removal by applying only sufficient force to overcome frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap removal device uses a coupled relative engagement movement between complementary control members, then the extractor can engage with the cap, but the force required to remove the cap becomes excessively high
Solution Approach 1:
The patent segments the cap removal process into two independent movements: (1) relative engagement movement between complementary control members that positions the extractor to engage with the cap, and (2) user-applied maneuvering movement that removes the cap. This segmentation allows the engagement mechanism to be pre-positioned without requiring the user to overcome both engagement friction and cap friction simultaneously, thereby reducing the force needed during actual cap removal.
Solution Approach 2:
The complementary control members perform preliminary action by automatically positioning the extractor in the engagement configuration with the cap before the user applies force for removal. This preliminary positioning ensures reliable extractor-cap engagement while separating the engagement preparation from the cap removal action, so users only need to overcome cap friction during removal, not engagement mechanism friction.
2Reliability
If the extractor control members are designed to engage securely with the cap, then cap removal safety improves, but the device complexity increases
Solution Approach 1:
The complementary control members are designed to automatically engage and position the extractor relative to the cap without requiring additional user intervention or complex actuation mechanisms. The control members self-position through their relative movement, ensuring secure extractor-cap engagement while maintaining simplicity in the overall device structure.
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
The solution enables easy and safe removal of the protective cap with minimal user effort, enhancing safety and usability by ensuring the cap is securely engaged before use, reducing the risk of accidents and improving handling convenience.
Implementation Method 1
the relative engagement movement acts against the frictional sources, in particular between the complementary extractor control members
Implementation Method 2
Before being removed, the needle protective cap is kept inserted on a complementary part of the syringe body, by friction
Data Source
AI summary
An assistance device for assisting in operation of an injection syringe including a syringe body carrying an injection needle covered with a protective cap. The assistance device includes a support for housing the syringe body, and a removal device for removing the protective cap, having a gripping member to be maneuvered by a user to remove this protective cap from the injection needle, and at least one extractor cooperating with the protective cap during removal of the protective cap. The removal device also has complementary members for controlling the extractor, which can be moved relative to each other in a relative engagement movement, to move the extractor between a reference configuration retracted relative to the protective cap and a cooperation configuration cooperating with the protective cap. The relative engagement movement is independent of the maneuvering movement applied by the user to the gripping member to remove the protective cap.