Safety syringe

Abstract

The invention relates to a safe injector and comprises an outer casing, a piston, a core rod and a needle component; a core rod locking ring is arranged at the rear of the outer casing; the needle component is movably arranged in a front needle seat; the needle component comprises a needle tube, a needle tube seat, a needle tube clasp and a sealing ring; the needle tube seat is movably arranged in the front needle seat of the outer casing through the needle tube clasp; the needle tube clasp is matched tightly with the installation and is fixed in a clasp cavity of the needle seat; inward inclined elastic damping claws are arranged above the needle tube clasp; a convex clasping cylinder is arranged at the rear of the needle tube seat; the front protrusion part of the core rod is provided with a clasping cavity which is matched with and is consistent to the clasping cylinder of the needle tube seat in shape. When the safe injector finishes an injection, the clasping cylinder is clasped in the clasping cavity of the core rod, the core rod is pulled back, the needle tube seat etc., are driven to shrink into the outer casing, and the core rod and the core rod locking ring are matched in a locking manner so as not to move forward or retreat. The safe injector can realize self-destruction after one injection, and has the advantages of reasonable structure, convenient use and good safety performance.

Description

technical field [0001] The invention relates to a medical device, in particular to a safety syringe. Background technique [0002] We know that a syringe is a commonly used medical device. It generally includes a jacket, a piston, a core rod, and a needle. In order to prevent cross-infection, more and more people pay attention to disposable use. However, the disposable syringes widely used now belong to the concept of management. In terms of performance, they are not "disposable" and can be used repeatedly, leaving hidden dangers for cross-infection and easy to cause disease transmission. In addition, during the subsequent processing after the injection, since most of the needles are exposed, it is very easy to puncture and scratch the doctors and patients, resulting in new cross-infection. Patent 200320123617.X discloses a safety syringe, which is composed of a needle tube, a needle seat, an outer casing and a fixed-stroke piston; the fixed-stroke piston is arranged in t...

AI Technical Summary

Problems solved by technology

However, due to strict requirements on the size of the sealing ring, the performance is not stable enough, and there is a large amount of residual liquid

Patent 200520016075.5 provides a manual safety syringe with automatic needle retraction, which includes an injection jacket, a barrel core rod, a needle seat, an injection needle tube, an O-ring, a compression spring plug, a compression spring, a sealing rubber ring, and a protective cap and the plunger, the injection needle tube is fixed in the needle seat, the front end of the injection jacket is provided with a fixing device for fixing the needle seat and the pressure spring plug, and there is a device between the needle seat and the pressure spring plug that can push the needle seat and the injection needle tube into the cylinder. The compression spring inside the core rod; the cylindrical core rod is inserted in the injection jacket, one end of the cylindrical core rod is covered with the sealing rubber ring on the outside, and the inner side is fixed with a spring that can enter the cylindrical core rod under the action of the reverse thrust of the needle seat. The other end of the internal piston extends out of the injection jacket, and a push end is installed, the push end includes a pusher and an end connected with the cylindrical core rod, and the end is tightly matched with one end of the cylindrical core rod, and There is a circular plate at the end, and a through hole is arranged on the circular plate, and the connection between the presser and the circular plate is a frangible structure connection. The disadvantage of this kind of syringe is that there is a lot of residual liquid.

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