Patent ID: 6673052
Filing Date: 2004-01-06
Classification: A61M

Abstract:
A nonreturn warning device for an intravenous drip infusion at least comprising:a top member having an opening at the bottom end thereof, a primary pipe and a secondary pipe both of which extend upward and are parallel to each other, said primary pipe being provided with a pointed bar; a bottom member having an opening at the top end thereof, an accommodation being formed by means that said top member and said bottom member are connected to each other, an outlet pipe extending downward at the bottom thereof, a flange projected into said bottom member and a recess being formed around said flange; a float constructed as a hollow cylinder and arranged in said accommodation between said top member and said bottom member, said float having a top cylinder extending into said secondary pipe and a cylindrical stopper extending into said outlet pipe; and a conic valve constructed as a soft body made of rubber while said conic valve has a middle hole for passage of the cylindrical stopper, with an annular groove at the rear side of the middle hole and a rim at the top thereof, said annular groove being engaged with said flange.