Equipment sets and system for the sequential administration of medical liquids at dual flow rates employing parallel secondary liquid tubing
First Claim
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1. A set for the sequential administration of medical liquids to a patient, said set comprising:
- a primary tube for the flow of a primary liquid therethrough and including a primary valve for controlling the flow of liquid through said primary tube,a secondary tube having first and second parallel branches for the parallel flow of a secondary liquid therethrough,a common tube having its distal end connected in fluid communication with the proximal ends of said primary tube and said first branch of said secondary tube, the proximal end of said second branch of said secondary tube connected in fluid communication to said common tube at a location on said common tube proximal to said connection of said first branch to said common tube said proximal end of said second branch being open for the flow of liquid therefrom to form a primary liquid flow path comprising said primary tube and said common tube and a secondary liquid flow path comprising the combined flow of secondary liquid through a first flow path defined by the portions of said secondary tube common to both branches, said first branch and said common tube and a second flow path defined by the portions of said secondary tube common to both branches, said second branch and said common tube,a first flow control means on said common tube between the distal end thereof and said connection to said second branch of said secondary tube for adjusting the flow rate of said primary and secondary liquid therethrough,a second flow control means in said second flow path for adjusting the flow rate of said secondary liquid therethrough, and,an air barrier in said second flow path substantially impervious to air while said set is in use and preventing the flow of air therethrough,whereby said secondary liquid flows through said secondary liquid flow path at a rate controlled by said first and second flow control means and said primary liquid flows through said primary liquid flow path at a rate independent of the flow rate of said secondary liquid.
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Abstract
Gravitational flow system and equipment sets for the sequential administration of medical liquids wherein a primary liquid can be administered at a flow rate independent of the flow rate of a secondary liquid, and including a barrier substantially impervious to air to prevent the inadvertent administration of air when the secondary liquid is depleted. The sets of this invention provide parallel flow paths for the secondary liquid to insure that the flow of primary liquid is interrupted while the secondary liquid is flowing.
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Citations
21 Claims
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1. A set for the sequential administration of medical liquids to a patient, said set comprising:
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a primary tube for the flow of a primary liquid therethrough and including a primary valve for controlling the flow of liquid through said primary tube, a secondary tube having first and second parallel branches for the parallel flow of a secondary liquid therethrough, a common tube having its distal end connected in fluid communication with the proximal ends of said primary tube and said first branch of said secondary tube, the proximal end of said second branch of said secondary tube connected in fluid communication to said common tube at a location on said common tube proximal to said connection of said first branch to said common tube said proximal end of said second branch being open for the flow of liquid therefrom to form a primary liquid flow path comprising said primary tube and said common tube and a secondary liquid flow path comprising the combined flow of secondary liquid through a first flow path defined by the portions of said secondary tube common to both branches, said first branch and said common tube and a second flow path defined by the portions of said secondary tube common to both branches, said second branch and said common tube, a first flow control means on said common tube between the distal end thereof and said connection to said second branch of said secondary tube for adjusting the flow rate of said primary and secondary liquid therethrough, a second flow control means in said second flow path for adjusting the flow rate of said secondary liquid therethrough, and, an air barrier in said second flow path substantially impervious to air while said set is in use and preventing the flow of air therethrough, whereby said secondary liquid flows through said secondary liquid flow path at a rate controlled by said first and second flow control means and said primary liquid flows through said primary liquid flow path at a rate independent of the flow rate of said secondary liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A gravitational flow system for the sequential administration of medical liquids to a patient, said system comprising:
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a primary container suspended in space for containing a primary medical liquid, a primary tube for the flow of a primary liquid therethrough and having its distal end in fluid communication with said primary container, a secondary container suspended in space at a height greater than that of said primary container for containing a secondary medical liquid, a secondary tube having its distal end in fluid communication with said secondary container and first and second parallel branches for the parallel flow of a secondary medical liquid therethrough, a common tube having its distal end connected in fluid communication with the proximal ends of said primary tube and said first branch of said secondary tube, the proximal end of said second branch of said secondary tube connected in fluid communication thereto at a location proximal to said connection of said first branch and its proximal end open for the flow of liquid therefrom to form a primary liquid flow path comprising said primary tube and said common tube and a secondary liquid flow path comprising the combined flow of secondary liquid through a first flow path defined by the portions of said secondary tube common to both branches, said first branch and said common tube and a second flow path defined by the portions of said secondary tube common to both branches, said second branch and said common tube, a primary valve in said primary tube which allows primary liquid to flow from said primary container whenever the height of said primary liquid is greater than or equal to the height of said secondary liquid in said system and which prevents primary liquid from flowing from said primary container whenever the height of said primary liquid is less than the height of said secondary liquid in said system, a first flow control means on said common tube between the distal end thereof and said connection to said second branch of said secondary tube for adjusting the flow rate of said primary and secondary liquid therethrough, a secondary flow control means in said second flow path for adjusting the flow rate of said secondary liquid therethrough, and an air barrier in said second flow path substantially impervious to air while said set is in use and preventing the flow of air therethrough, whereby secondary liquid flows through said secondary liquid flow path at a rate controlled by said first and second flow control means and said primary liquid flows through said primary liquid flow path at a rate independent of the flow rate of said secondary liquid.
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Specification