Needleless Syringe Damping Mechanism for Rebound Control
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Solution Overview
Problem
Needleless syringes face challenges in damping the impact of the movable assembly when the downstream obturator contacts the receptacle's bottom and preventing rebound, which can lead to inefficient liquid acceleration and potential leaks during injection.
Innovation Solution
The syringe design features a central bore with a protuberance reducing the cross-section, allowing the downstream obturator to lodge and brake, with a pneumatic braking mechanism to control the assembly's movement, ensuring smooth liquid flow and preventing reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the downstream obturator is made to contact the bottom of the receptacle bore, then the injection force is transmitted effectively, but the impact causes rebound and multiple jet reverberations
Solution Approach 1:
A damping element is positioned in advance within the receptacle bore to cushion the impact of the downstream obturator before it contacts the bottom. This element absorbs the shock and prevents rebound, eliminating multiple jet reverberations while maintaining effective force transmission for injection.
2Ease of operation
If the bore cross-section is reduced by a protuberance, then the downstream obturator brakes smoothly, but the clearance for injection conduits must be maintained
Solution Approach 1:
The bore is designed with a localized protuberance that reduces the cross-section at a specific position to provide braking action. This localized modification allows smooth obturator braking while maintaining adequate clearance for injection conduits in other regions, balancing operational smoothness with structural simplicity.
3Measurement precision
If the reservoir is made transparent for regulatory verification, then filling correctness can be verified, but compatibility with the active principle for long-term storage is compromised
Solution Approach 1:
The reservoir is made transparent or translucent, allowing visual verification of correct filling before injection. The material selection balances transparency for verification with chemical compatibility for long-term storage of the active principle, ensuring both regulatory compliance and pharmaceutical stability.
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 enhances the initial phase of injection by reducing pain and ensuring rapid liquid acceleration without rebound, while preventing leaks and facilitating sterilization and asepsis processing.
Implementation Method 1
the lateral wall of the bore comprises at least one protuberance reducing the cross section relative to the upstream opening of the bore
Implementation Method 2
a pneumatic braking mechanism to control the assembly's movement
Implementation Method 3
this orifice can be calibrated in such a way as to limit the flow of air driven by the downstream obturator and thus participate in a pneumatic braking of the movable assembly
Data Source
AI summary
The invention relates to needleless syringe for injecting an active liquid principle. The inventive syringe comprises a container (3) closed by a movable shutter and containing the injectable liquid. Said container is initially insulated from an injector-receptacle provided with a cylinder bore (10) in which a downstream shutter is arranged and which comprises at least one protuberance reducing the section with respect to the upstream opening of the bore. The aim of said invention is to damp and prevent the downstream shutter bounce when it is disposed in the bore (10) of the receptacle.