Ration extraction syringe

The utility model discloses a ration extraction syringe, including push rod, handle barrel and sleeve pipe, handle barrel is inside cavity and the open barrel of one end, on its inside wall by its oneend to other end interval or be equipped with annular draw -in groove in succession, the sleeve pipe with handle barrel's the other end is connected and the intercommunication, push rod one end by handle barrel's uncovered department stretches into in the handle barrel to its one end tip be equipped with with handle barrel inner wall sealing contact's piston, its other end is located outside thehandle barrel, the outside solid fixed ring of push rod one end be equipped with with elastic spacing collar of card slot well -matched, under the exogenic action, the push rod is followed handle barrel's inner wall removes, and drives the piston is followed handle barrel's inner wall removes, the spacing collar slips handle barrel's inner wall to the slidable is to arbitrary one in the draw -in groove. 本实用新型公开了种定量萃取注射器，包括