Pneumatic magnetic energy storage needleless syringe

Abstract

The invention discloses a pneumatic magnetic energy storage needleless syringe. The syringe comprises a cylinder barrel with an inner cavity, a front end cover fixedly arranged at the front end of the cylinder barrel, a rear end cover fixedly arranged at the rear end of the cylinder barrel, a needleless ampoule assembly arranged on the front end cover and an impact part movably arranged in the inner cavity of the cylinder barrel along the front and back direction; the rear end cover is fixedly provided with a magnet capable of magnetically attracting the impact part; the rear end cover is also provided with an air flow passage communicated with the inner cavity of the cylinder barrel; a seal part capable of plugging the air flow passage is fixedly arranged at the rear part of the impact part; the needleless syringe also comprises an air source device for charging compressed air into the air flow passage; the needleless ampoule assembly at least comprises a piston rod capable of moving front and back. The compressed air is charged into the air flow passage by the air source device, and when the air pressure value in the air flow passage achieves a certain value, the impact part overcomes the magnetic force of the magnet to forwards impact to realize the injection process. The needleless syringe is simple in structure and excellent in manufacturing process and has well use performances.

Description

[0001] technical field [0002] The invention relates to a pneumatic magnetic energy storage type needle-free injector. [0003] Background technique [0004] Needle-free injection technology is to inject liquid medicine directly into the body tissues in the form of ultra-fine, high-speed, and straight-line high-pressure jets without the use of needles, which solves a series of problems caused by traditional injections caused by needles piercing the body. , such as: pain, bleeding, infection, tissue damage, psychological stress of patients, etc.; at the same time, the distribution of drugs injected without needles in the tissue is more diffuse, which is conducive to the absorption of drugs, and the skin is not easy to harden after long-term injection. Therefore, needle-free injection technology has broad application prospects, especially for children's vaccination and diabetic patients. [0005] In the prior art, some needle-free injectors are often driven by air pressur...

AI Technical Summary

Problems solved by technology

[0006] However, the current needle-free syringes driven by compressed air mainly have the following disadvantages: 1. The structure is extremely complex, the manufacturing precision is extremely high, and the cost is high; 2. In order to To seal the gas, the seal between the cylinder piston and the cylinder is generally sealed by a sealing ring, or a dynamic seal with a very small gap.

The cost of the former sealing method is lower, but the friction coefficient of the piston will change every time during the process of the piston from static friction to dynamic friction, and the range of change is generally about 20%, which causes the impact force of the cylinder piston to be unstable every time. The injection depth varies from deep to shallow; the latter sealing method, the cooperation between the piston and the inner hole of the cylinder is extremely precise, which generally needs to be achieved by the matching research process, not only the manufacturing process is not good, but also foreign matter such as fine dust is easy to enter , resulting in malfunction of the syringe

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