Patent ID: 7695449
Filing Date: 2010-04-13
Classification: A61M

Abstract:
1. An automatic syringe for instant liquid-powder drug mixing characterized in that the syringe comprises a injecting assembly, a drug mixing assembly and a shooting device; wherein: the injecting assembly includes a tubular injecting outer sleeve, in which a blocking ampoule is slidably socketed; the blocking ampoule contains the powder drug and has an open bottom end; a piston is provided inside the blocking ampoule; a needle having two piercing ends is coaxially connected to the mouth of the blocking ampoule through a hub; the needle is located to the front end of the injecting outer sleeve and the bottom of the blocking ampoule is located to the rear end of the injecting outer sleeve; the drug-mixing assembly includes a tubular drug-mixing outer sleeve; the front end of the drug-mixing outer sleeve is closed having a hole in the centre; a menstruum bottle pre-charged with pressure is slidably socketed in the drug-mixing outer sleeve; a drug-mixing needle having two piercing ends is coaxially connected with the mouth of the menstruum bottle through a drug-mixing needle bracket; the drug-mixing needle is positioned to the front end of the drug-mixing outer sleeve and the bottom of the menstruum bottle is positioned to the rear end of the drug-mixing outer sleeve; the shooting device includes a tubular shooting outer sleeve and a spring pushing rod mechanism slidably socketed in the shooting outer sleeve; the rear end of the injecting assembly is alternatively connected with the front end of the drug-mixing assembly and the front end of the shooting device respectively through a rotary joining mechanism; when the injecting assembly is coaxially connected to the drug-mixing assembly, the drug-mixing needle aims at the piston provided on the bottom of the injecting assembly; when the injecting assembly is coaxially connected to the shooting device, the front end of the resilient pushing rod rests against the blocking ampoule and the piston.