Parenteral check valve
First Claim
1. A check valve for use with apparatus to administer solutions, comprising:
- a valve disk, wherein said valve disk comprises;
a flat, circular piece of flexible material with a Shore A durometer hardness in the range of about 35-100 having at least three arcuately-shaped windows formed in said piece, each adjacent window being separated by a web of predetermined width;
a sealing annulus at the outer periphery of said piece, said sealing annulus being defined by the formation of said windows; and
a central closure for closing a valve seat of the check valve, said closure being defined by the formation of said windows concentrically inward from said windows and attached to said sealing annulus by said webs;
a first housing portion with an inlet adapted to receive a supply conduit, said first housing portion comprising first retaining means for retaining said valve disk;
a second housing portion with an outlet adapted to receive a discharge conduit, said second housing portion comprising second retaining means for retaining said valve disk, wherein said first and second retaining means each comprise an annular ridge in opposed surfaces of said first and second housing portions;
wherein said first and second retaining means together with said valve disk sealing said check valve when said first and second housing portions are coupled together; and
preloading means for preloading said valve disk, wherein said valve disk is adapted to open and close said inlet and wherein said preloading means comprises the valve seat being formed in said first housing portion to protrude therefrom a preselected distance from said surface of said first housing portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A check valve, including an inlet housing portion and outlet housing portion which are adapted to be snap-fit together, is inexpensively and quickly produced using valve disks which are capable of providing variable fluid flow resistance. The valve disk is stamped from flexible materials having a Shore A durometer hardness in the range of from about thirty to about one hundred (e.g., a thermoplastic elastomer). Flat, circular shapes having at least three, arcuately-shaped windows defined therein, with an outer sealing periphery being joined to a circular closing member by webs which separate the windows, provide a valve disk of substantial manufacture ease. The check valve is adapted to be used in primary and secondary solution lines, and its variable resistance to fluid flow is enable by merely increasing or decreasing the combined surface area of the windows, increasing or decreasing a preload provided by extending a valve seat in the inlet housing towards the valve disk, increasing or decreasing thicknesses of a valve disk, or varying the proportion of the diameters of the closing member to the valve seat.
58 Citations
17 Claims
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1. A check valve for use with apparatus to administer solutions, comprising:
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a valve disk, wherein said valve disk comprises; a flat, circular piece of flexible material with a Shore A durometer hardness in the range of about 35-100 having at least three arcuately-shaped windows formed in said piece, each adjacent window being separated by a web of predetermined width; a sealing annulus at the outer periphery of said piece, said sealing annulus being defined by the formation of said windows; and a central closure for closing a valve seat of the check valve, said closure being defined by the formation of said windows concentrically inward from said windows and attached to said sealing annulus by said webs; a first housing portion with an inlet adapted to receive a supply conduit, said first housing portion comprising first retaining means for retaining said valve disk; a second housing portion with an outlet adapted to receive a discharge conduit, said second housing portion comprising second retaining means for retaining said valve disk, wherein said first and second retaining means each comprise an annular ridge in opposed surfaces of said first and second housing portions; wherein said first and second retaining means together with said valve disk sealing said check valve when said first and second housing portions are coupled together; and preloading means for preloading said valve disk, wherein said valve disk is adapted to open and close said inlet and wherein said preloading means comprises the valve seat being formed in said first housing portion to protrude therefrom a preselected distance from said surface of said first housing portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for administration of solutions, comprising:
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a fluid source containing one solution; means for delivering said one solution to a patient; and an antireflux valve for said means for delivering said one solution, said antireflux valve comprising; a valve disk; first housing means housing said valve disk, said first housing means including an inlet, a valve seat, and a first valve disk retaining surface; second housing means including an outlet, and a second valve disk retaining surface; said first and second housing means adapted to be snap-fit together such that said valve disk is retained between said first and second valve disk retaining surfaces; and said valve disk comprises; a flat, circular piece of flexible material with a Shore A durometer hardness in the range of about 35-100 having at least three arcuately-shaped windows formed in said piece, each adjacent window being separated by a web of predetermined width; a sealing annulus at the outer periphery of said piece, said sealing annulus being defined by the formation of said windows; and a central closure for closing the valve seat of the check valve, said closure being defined by the formation of said windows concentrically inward from said windows and attached to said sealing annulus by said webs. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification