Needleless Syringe with Magnetic Piston for Skin Injection
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Solution Overview
Problem
Existing needleless syringes are limited in their ability to evenly inject a small amount of drug over a large area of the skin, causing potential skin tissue damage and discomfort due to their design, which restricts their use in fields like skin care where multiple injections are needed.
Innovation Solution
A needleless syringe design featuring a solenoid coil, a moving magnetic body, and a stationary magnet that reciprocates a piston to pressurize and inject a drug, with a nozzle opening/closing valve and an elastic member to manage fluid pressure and recoil, allowing for rapid and repeated injections by controlling current supply to the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a needleless syringe is configured to inject a predetermined amount of drug into only one part of the skin at a time, then the injection mechanism is simple, but skin tissue damage may occur and the device cannot evenly inject drug over large areas
Solution Approach 1:
The syringe barrel is divided into multiple drug accommodating portions (first, second, third portions) with separate nozzles (first, second nozzles). Each portion can independently accommodate and inject drug, allowing the device to cover larger skin areas and distribute injection points to reduce tissue damage while maintaining a relatively simple overall structure
2Device complexity
If a needleless syringe injects into a single location, then the structure is simple, but reloading is required after one injection causing discomfort and limiting repeated use
Solution Approach 1:
The syringe is segmented into multiple drug accommodating portions that can be independently used. After one portion is emptied, the piston can be reset while other portions remain available, enabling repeated injections without full reloading and improving operational convenience
Solution Approach 2:
The multiple drug accommodating portions are designed to enable continuous injection operations. While one portion is being used, others are available as backup, ensuring the useful action of drug injection continues without interruption or full reloading, enhancing ease of repeated use
3Ease of manufacture
If a needleless syringe is designed for single-point injection, then manufacturing is simple, but it cannot evenly distribute drug over large skin areas
Solution Approach 1:
The syringe incorporates multiple drug accommodating portions (first, second, third portions) with corresponding nozzles, allowing the device to target multiple skin locations simultaneously or sequentially. This segmentation enables even drug distribution over larger areas while maintaining a manufacturing process that builds upon the simple single-point injection design
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
Enables rapid and repeated injection of a small amount of drug over a wider area, minimizing recoil and energy usage, and allowing for adjustable injection amounts, while maintaining a simple structure and preventing heat-induced magnetic field weakening.
Implementation Method 1
a solenoid coil wound on an outer circumferential surface of the body; a moving magnetic body that is long inserted into the body in a longitudinal direction and reciprocates forward and backward by a magnetic force generated when a current is applied to the solenoid coil
Implementation Method 2
a stationary magnet that is inserted and fixed behind the moving magnetic body inside the body
Implementation Method 3
an elastic member that is installed between the piston and the cylinder and applies an elastic force in a backward movement direction to the piston when the moving magnetic body moves backward
Implementation Method 4
a nozzle portion opening/closing valve that is provided to open/close a passage hole between the nozzle portion and the drug accommodating portion, is pushed by a fluidic pressure applied by the drug from the drug accommodating portion during forward movement of the piston to open the passage hole
Data Source
AI summary
A needleless syringe according to the present invention including a moving magnetic body and a stationary magnet wherein, when a piston moves forward, a magnetic field is generated in a direction opposite to the magnetic field direction of the stationary magnet to offset the magnetic field of the stationary magnet and thus separating the moving magnetic body and the stationary magnet from each other and, when the piston moves backward, the moving magnetic body is attracted using the magnetic field of the stationary magnet so that the piston for pressurizing and injecting a drug can repeatedly and reciprocally move forward or backward, thereby rapidly and repeatedly injecting a predetermined drug.