Syringe Locking Mechanism with Protective Sheath
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Solution Overview
Problem
Classic syringes used in dentistry face issues such as frequent needle pricking risks, soiling of the syringe body, unprotected cartridge during injection, and long operation times due to screwing and unscrewing processes, along with disengagement risks from transverse forces on the polypropylene material's elasticity.
Innovation Solution
A syringe system with a longitudinal hub featuring female or male retaining means and a moveable protective sheath, combined with a syringe handle having matching retaining means and blockers, ensuring a secure locking mechanism through anti-return slides and radial holding functions, reducing the risk of accidental disengagement and needle pricking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the syringe is made of elastic plastic material (polypropylene) to enable easy assembly and compatibility with medical needs, then the ease of manufacture and ease of operation are improved, but the reliability deteriorates due to disengagement risks under transverse forces
Solution Approach 1:
The patent applies preliminary action by pre-configuring the locking mechanism with a locking element that automatically engages with a locking surface when the protective sheath is in the retracted position. This preliminary arrangement ensures that the locking action is prepared in advance, preventing disengagement before it can occur under transverse forces during use.
Solution Approach 2:
The patent introduces an intermediary locking element that acts as a mediator between the protective sheath and the syringe body. This locking element transfers and stabilizes the locking force, ensuring reliable engagement while allowing the elastic plastic material to maintain its ease of operation and manufacturing advantages.
2Object-affected harmful factors
If a moveable protective sheath is used to cover the needle and locking mechanism, then the safety against needle pricking is improved, but the device complexity increases
Solution Approach 1:
The patent merges the protective sheath with the locking mechanism by integrating the locking element directly into the sheath structure. This combination allows the protective sheath to perform dual functions: protecting the needle and providing the locking action, thereby reducing overall device complexity while maintaining safety benefits.
Solution Approach 2:
The protective sheath is designed with multi-functionality, serving both as a safety cover for the needle and as an integral part of the locking mechanism. This universal design eliminates the need for separate locking components, simplifying the overall structure while ensuring protection against needle pricking.
3Reliability
If a secure locking mechanism is implemented to prevent disengagement, then the reliability is improved, but the ease of operation deteriorates due to more complex locking procedures
Solution Approach 1:
The patent applies self-service by designing an automatic locking mechanism where the locking element engages with the locking surface automatically when the protective sheath is retracted. This self-acting mechanism eliminates the need for manual locking operations, maintaining ease of operation while ensuring high reliability through secure engagement.
Solution Approach 2:
The locking mechanism is pre-configured so that the locking element is positioned to automatically engage with the locking surface before transverse forces can cause disengagement. This preliminary locking action ensures reliability without requiring complex operational steps from the user.
Data Source
AI summary
A syringe including an injection syringe body and a syringe handle, configured to cooperate with one another in order to ensure a locking function between the injection syringe body and the syringe handle. The injection syringe body includes a longitudinal hub including at least one female or male retaining element, and a protective sheath moveable along said longitudinal hub and able to cover in a retracted position the at least one retaining element of the longitudinal hub. The syringe handle includes at least one male or female retaining element intended to cooperate with the at least one female or male retaining element of the longitudinal hub, ensuring a retaining function, the cooperation being named locking position. The syringe further includes at least one blocker, the at least one blocker ensuring a radial holding function when the retracted and the locking positions are both engaged.