Patent ID: 6390130
Filing Date: 2002-05-21
Classification: A61M,F16K

Abstract:
A check valve for medical infusion lines comprising:a first and a second tubular element that respectively define an upstream passageway and a downstream passageway, said first and second tubular elements being mutually coaxial to each other, and a diaphragm of elastically deformable material transversely positioned between said first and second tubular elements, said diaphragm acting as a fluid seal in combination with an annular valve seat of said first tubular element to keep the said check valve normally closed, wherein a predetermined fluid pressure in said upstream passageway causes flexion of said diaphragm and the resulting opening of said check valve, and wherein said diaphragm has an annular peripheral section, a disc-shaped central section which acts as a valve obturator and openings between said annular peripheral section and said disc-shaped central section, said disc-shaped central section having a first side facing said valve seat and a first thin circumferentially continuous sealing lip projecting axially from said first side of said central section and a second thin circumferentially continuous sealing lip projecting axially from a second side of said central section.