Patent ID: 6390120
Filing Date: 2002-05-21
Classification: A61M,Y10T

Abstract:
A check valve for a medical infusion line, comprising:a first and a second tubular element positioned coaxially to each other to respectively define an upstream and a downstream passageway; a diaphragm of elastically deformable material transversely positioned between said first and second tubular elements, said diaphragm sealingly cooperating with an annular valve seat of the said first tubular element to form a fluid seal that maintains said check valve in a normally closed position, and in which a predetermined fluid pressure in the said upstream passageway causes a deflection of said diaphragm and consequent opening of said check valve, wherein: said annular valve seat is defined by a front surface of said first tubular element, and wherein said diaphragm includes a cup-shaped element positioned coaxially with said upstream and downstream passageways; said cup-shaped element having a lateral wall and a bottom wall, said bottom wall contacting said annular valve seat and said lateral wall having a free edge contacting said second tubular element, said cup-shaped element being disposed in axial compression between said annular valve seat and said second tubular element, said bottom wall being normally urged into a sealing contact against said annular valve seat under an axial thrust provided by said lateral wall of said cup-shaped element; a deflection of said bottom wall of said cup-shaped element being produced in use by said predetermined fluid pressure thereby causing an axial separation of said bottom wall relative to said annular valve seat.