Syringe With Retractable Needle Cannula And Sealing Mechanism
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Solution Overview
Problem
Existing syringes are complicated to operate, particularly when installing the needle cannula, which can lead to contamination and difficulty in drawing in the fluid, making them cumbersome for users.
Innovation Solution
A syringe design featuring a hollow body, piston, and intermediate piece with a coaxial movement mechanism that allows the needle cannula to be moved between two needle seats, enabling easier operation by simplifying the installation and fluid release process, and incorporating a sealing mechanism to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the needle cannula is installed in a conventional manner at the hollow body, then the syringe can be used for fluid injection, but the installation process becomes complicated and the needle cannula can be contaminated by bacteria
Solution Approach 1:
The needle cannula is nested within the hollow body through a needle seat that allows it to be drawn in completely during use. The needle seat provides a guided path for the needle cannula, ensuring it remains positioned within the hollow body structure throughout the injection process, preventing external contamination while maintaining functionality.
Solution Approach 2:
The needle cannula is pre-installed in a sterile manner during manufacturing within the hollow body, eliminating the need for user installation. This preliminary action ensures the needle cannula is already in place and properly positioned before the syringe reaches the user, preventing contamination during handling.
2Object-affected harmful factors
If the needle cannula is drawn in during use, then safety is improved, but the handling becomes more complicated
Solution Approach 1:
The needle cannula is designed to be dynamically movable within the hollow body, transitioning from an extended position during injection to a drawn-in position after use. The needle seat facilitates this dynamic movement, allowing the needle cannula to be automatically drawn in as the piston moves, reducing injury risk without requiring additional user actions.
Solution Approach 2:
The needle cannula is automatically drawn in during the normal injection process as the piston moves forward, eliminating the need for separate user actions to retract the needle. The system self-manages the needle retraction through the mechanical interaction between the piston, needle seat, and hollow body structure.
3Ease of operation
If the fluid has to be drawn into the syringe manually, then flexibility is maintained, but the process becomes complicated for the user
Solution Approach 1:
The syringe is pre-filled with the required fluid volume during manufacturing, eliminating the need for manual fluid drawing by the user. The hollow body is filled to the appropriate level and sealed, so the user simply needs to attach the needle cannula and inject, significantly simplifying the operation while maintaining the necessary fluid delivery capability.
Data Source
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AI summary
The invention relates to a syringe (1) comprising a hollow body (2) having a surrounding hollow body surface (21) and forming a passage (22) therein, wherein an axis (A) is formed in an axial longitudinal direction of the hollow body (2) and the passage (22) has a rear body opening (23) and a front body opening (24) arranged opposite to one another in the longitudinal direction, wherein a first needle seat (25) is formed at the front body opening (24), in which a needle cannula (26) is arranged and relative to which the needle cannula (26) is movable along the axis (A); comprising a piston (3) which is arranged in the hollow body (2) and is movable in the passage (22) along the axis (A); and comprising a seal (47, 43a), said seal (47, 43a) being able to be cancelled such that a receiving chamber (34) and a supply space (42) of the syringe (1) are in flow communication in a release position.