Disposable syringe with automatically retractable syringe needle

• Main Author: SHIHENG SUN
• Format: Patent
• Language: English
• Published: 07.07.2004
• Edition: 7
• Subjects: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE

The utility model discloses a disposable syringe with automatically retractable syringed needle, aiming to provide a syringe needle with neilsbed components which can be assembled easily and fast. The utility model comprises a syringe, a push rod and neilsbed components which consist of a need, a spring, a neilsbed and an O-shaped ring and which are arranged on the head of the syringe; wherein the outer surface of the convex ring on the tail of the neilsbed is corresponding to the inner ring surface of the O-shaped ring, while the outer ring surface of the O-shaped ring is corresponding to inner surface of the head of the syringe, the push rod is of a pipe shape with the front covered by an end cap and the tail extruding radially to form a push-pressure board, the push rod coordinates with the inner wall of the syringe through a piston arranged on the front of the push rod, a spring cover covering the spring is arranged on the neilsbed radially with an inner diameter larger than the outer diameter of the spring, a limit sheet is arranged between the push-pressure board and the port on the tail of the syringe. The utility model has the advantages that the neilsbed components is assembled easily and fast and that the assembly quality of the syringe needle is ensured; therefore, the self-destruction resulting form accidents which occur during the assembly and transportation of syringed needs.