Needle-Free Jet Injector With Pneumatic Hammer Reset
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Solution Overview
Problem
Existing needle-free syringes for drug delivery suffer from high drug consumption, skin damage, and low injection speed due to complex operation mechanisms, necessitating a simpler and more stable configuration for generating a waterjet using air pressure.
Innovation Solution
A liquid jet injection device with a cylinder, hammer, control valve, and nozzle system, where a hammer moves within the cylinder, collides with a piston to discharge liquid, and is restored using compressed air, simplifying the operation through a control valve and magnetic return mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex operation mechanism is used to generate waterjet for needle-free injection, then injection function is achieved, but device complexity increases and stability decreases
Solution Approach 1:
The device is divided into distinct functional modules: a cylinder for generating compressed air, a hammer mechanism for converting pneumatic energy to mechanical motion, and a nozzle for liquid discharge. This segmentation allows each component to perform its specific function efficiently, improving overall reliability while maintaining manageable complexity.
Solution Approach 2:
The hammer mechanism automatically returns to its initial position using the compressed air stored in the cylinder, eliminating the need for additional return springs or complex reset mechanisms. This self-service feature simplifies the overall mechanism while ensuring stable repeated operation.
2Force
If strong air pressure is applied to compress piston for drug injection, then injection force is improved, but skin damage occurs and drug consumption increases
Solution Approach 1:
The device uses periodic compression and expansion of air in the cylinder to drive the hammer in repeated cycles. Each cycle delivers a controlled injection force through the nozzle, allowing the system to achieve effective drug delivery over multiple cycles rather than requiring excessive force in a single action, thereby reducing skin damage.
Solution Approach 2:
The system employs pneumatic pressure from compressed air to drive the hammer mechanism, which then converts this pneumatic energy into mechanical motion for liquid propulsion. This indirect pneumatic-hydraulic transmission provides controlled, repeatable force delivery that reduces the risk of tissue damage compared to direct high-pressure application.
3Productivity
If high output intensity is used for continuous injection, then injection speed increases, but skin damage is caused and operation restrictions increase
Solution Approach 1:
The hammer mechanism operates in periodic cycles, repeatedly compressing and expanding the liquid through controlled pneumatic action. This periodic operation enables continuous injection over time at high effective speed while allowing tissue recovery between cycles, thus avoiding the skin damage associated with sustained high-intensity continuous pressure.
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 device achieves stable and repeated liquid injection with reduced manufacturing and maintenance costs by simplifying the configuration, lowering failure rates and maintaining price competitiveness.
Implementation Method 1
the hammer, when the intake flow path is opened, moves to the other end of the cylinder by the compressed air supplied to one end of the cylinder
Implementation Method 2
when the exhaust flow path is opened, the hammer is moved to one end of the cylinder by being pushed by an air flow in which the compressed air charged in the charging part escapes to the outside of the cylinder through the exhaust flow path due to an applied pressure difference
Implementation Method 3
a nozzle part coupled to the pressurizing part and formed to discharge to the outside a liquid medicine stored therein when the hammer collides with the piston
Data Source
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AI summary
Disclosed is a liquid jet injection device for injecting a liquid medicine into the tissue of an organism without an injection needle. The liquid jet injection device comprises: a cylinder; a casing that surrounds the cylinder; a cylinder part that is accommodated in the cylinder and provided with a hammer that can move between one end and the other end of the cylinder; an intake flow path that connects one end of the cylinder and a compressed air-generating part that generates compressed air that is supplied to the cylinder; a control valve for selectively opening and closing an exhaust flow path that connects the one end of the cylinder to the outside; a pressurizing part provided with a piston that faces an opening formed at the other end of the cylinder; and a nozzle part that is coupled to the pressurizing part, wherein the nozzle part discharges the liquid stored therein to the outside when the hammer collides with the piston. A charging part, which communicates with the other end of the cylinder and in which compressed air is compressed and charged when the intake flow path is opened, is provided between the casing and the cylinder. When the exhaust flow path is opened in a state in which the hammer has moved from the one end to the other end of the cylinder due to the opening of the intake flow path, the hammer is moved from the one end to the other end of the cylinder by the compressed air compressed and charged in the charging part.