초록 ▼

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 second

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 equipment sets of this invention have a primary tube valve controlled by pilot liquid diverted from the secondary liquid flow path.

대표청구항 ▼

In a set for the sequential administration of medical liquids to a patient, said set including: a primary tube for the flow of primary medical liquid therethrough and including a primary valve for controlling the flow of liquid through said primary tube, a secondary tube for the flow of a secondary

In a set for the sequential administration of medical liquids to a patient, said set including: a primary tube for the flow of primary medical liquid therethrough and including a primary valve for controlling the flow of liquid through said primary tube, a secondary tube for the flow of a secondary medical liquid therethrough; said primary valve being effective only to prevent the flow of primary liquid administration therethrough during administration of secondary liquid, the flow of secondary liquid through said secondary tube being independent of the operation of said primary valve, a common tube having its distal end in fluid communication with the proximal ends of said primary and secondary tube 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 flow path comprising said secondary tube and said common tube, the improvement which comprises: a secondary flow control means in said secondary liquid flow path for adjusting the flow rate of said secondary liquid therethrough, a primary flow control means on said primary tube for adjusting the flow rate of said primary liquid through said primary flow path to a rate independent of the flow rate of said secondary liquid through said secondary liquid flow path, and an air barrier in said secondary liquid flow path substantially impervious to air for preventing the flow of air therethrough, said primary valve characterized by a housing having an inlet thereto, an outlet therefrom, said inlet being connected in fluid communication with said primary tube for entrance of said primary liquid into and through said housing and out of said outlet, and a port not in fluid communication with said inlet and outlet to said primary valve, said port connected in fluid communication to the proximal end of a secondary liquid pilot tube which is connected in fluid communication at its distal end to said secondary tube for the flow of secondary liquid into said port, whereby said secondary liquid flowing into said port is effective to close said outlet to the flow of primary liquid from said primary valve.