Valve for medical infusion lines and the like
First Claim
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1. 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.
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Abstract
A check valve for medical infusion lines and the like, including a diaphragm made of elastic material inserted between a first and a second tubular connector and acting on an annular valve seat to keep the check valve normally closed. The diaphragm includes an annular peripheral section and a central disc, connected to the peripheral section via a crown of spaced-out arms. The disc is moulded with a thin, axially projecting, circumferential sealing lip on one face or, more conveniently, on both faces thereof.
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Citations
25 Claims
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1. A check valve for medical infusion lines comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A check valve for medical infusion lines comprising:
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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 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, 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, and a crown of arched arms connecting said disc-shaped central section to said annular peripheral section, said disc-shaped central section having a side facing said valve seat and a thin circumferential sealing lip projecting axially from said side of said disc shaped central section, said annular peripheral section having the same thickness as said disc-shaped central section, said annular peripheral section being fitted between said first and second tubular elements without axial blocking, said annular peripheral section having a crown of axial projections on at least one of its faces and said diaphragm having a planar configuration when the valve is in a closed position. - View Dependent Claims (24, 25)
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Specification