Needleless Syringe Pre-Fill Nozzle Load Reduction
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Solution Overview
Problem
Needleless syringes face issues with excessive load and noise during injection due to sudden pressure changes in the nozzle, and conventional designs with ball valves create resistance that inhibits efficient injection.
Innovation Solution
A destroyable sealing member is used to pre-fill the flow passage unit with the injection substance, reducing the load on the nozzle and minimizing noise by applying pressure gradually, allowing for efficient discharge without degrading user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection solution is pressurized and allowed to flow all at once into the nozzle which is in the atmospheric pressure state, then the injection can be performed, but the pressure received by the nozzle from the injection solution is extremely changed, causing the nozzle to be deformed and/or destroyed and noise to be generated
Solution Approach 1:
The patent applies preliminary action by pre-filling the nozzle with injection solution before the main injection occurs. This is achieved by initially positioning the piston plug to allow solution to enter the nozzle, then moving the piston plug to seal the accommodating chamber. This preliminary filling ensures the nozzle is already pressurized and contains the injection solution before the actual injection force is applied, preventing sudden pressure changes and reducing load on the nozzle structure.
2Object-affected harmful factors
If a ball valve is used to seal the accommodating chamber and allow preparatory filling of the nozzle, then the nozzle can be filled with injection solution before injection, but the ball valve substantially remains in the flow passage between the accommodating chamber and the nozzle during injection, acting as resistance against the flow and dispersing the energy of the pressurized injection solution
Solution Approach 1:
The patent extracts and eliminates the ball valve component from the system. Instead of using a ball valve to seal the accommodating chamber and control flow, the invention uses a piston plug that can be positioned to seal the chamber and a one-way valve mechanism that allows solution to flow in one direction without resistance during injection. This removal of the ball valve eliminates the resistance it would create in the flow passage while still achieving the preparatory filling function.
3Object-affected harmful factors
If the ball valve is moved in the main syringe body to fill the nozzle before injection, then the preparatory filling can be achieved, but the convenience of the syringe is deteriorated due to the complexity of the operation
Solution Approach 1:
The patent applies self-service by designing a system where the preparatory filling and sealing actions occur automatically through the inherent mechanics of the piston plug movement. The piston plug is initially positioned to allow filling, then automatically seals the chamber when pressure is applied or when the user actuates the injection mechanism. This eliminates the need for separate manual operations to position valves or control filling, making the device as convenient to use as conventional syringes while still providing the benefits of preparatory filling.
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 mitigates the load on the nozzle, reduces noise, and ensures efficient injection by gradually applying pressure, maintaining user convenience and allowing for various forms of injection substances like liquids, gels, or powders.
Implementation Method 1
a pressurizing unit (2a) which pressurizes the injection objective substance accommodated in the accommodating unit (2b) to move the sealing member (7, 8)
Implementation Method 2
a flow passage unit (5, 11) which forms a discharge port (4a) with respect to the injection target area and which defines a flow passage (11) so that the injection objective substance pressurized by the pressurizing unit (2a) is discharged via the discharge port (4a) to the injection target area
Data Source
AI summary
The present invention resides in a needleless syringe for injecting an injection objective substance into an injection target area of a living body without using any injection needle; the needleless syringe comprising a main syringe body; an accommodating unit which accommodates the injection objective substance by the aid of a sealing member in an accommodating chamber provided in the main syringe body; a pressurizing unit which pressurizes the injection objective substance accommodated in the accommodating unit to move or destroy the sealing member thereby so that the injection objective substance is discharged to outside; a flow passage unit which forms a discharge port with respect to the injection target area and which defines a flow passage so that the injection objective substance pressurized by the pressurizing unit is discharged via the discharge port to the injection target area; and a preparatory filling unit which fills the flow passage unit with a part of the injection objective substance accommodated in the accommodating chamber by destroying a part of the sealing member before pressurization is performed by the pressurizing unit. Accordingly, it is possible to mitigate the load exerted on the nozzle during the injection and reduce the noise without deteriorating the convenience of a user of the needleless syringe.