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Equipment sets having a combined air barrier and liquid sequencing device for the sequential administration of medical liquids at dual flow rates

  • US 4,324,238 A
  • Filed: 06/09/1980
  • Issued: 04/13/1982
  • Est. Priority Date: 02/28/1979
  • Status: Expired due to Term
First Claim
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1. A set for the sequential administration of medical liquids to a patient, comprising:

  • a primary tube for the flow of a primary medical liquid therethrough,a secondary tube for the flow of a secondary medical liquid therethrough,a common tube having its distal end in fluid communication with the proximal ends of said primary and secondary tubes and its proximal end open for the flow of liquid therethrough to form a primary liquid flow path comprising said primary tube and said common tube and a secondary liquid flow path comprising said secondary tube and said common tube,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, andcombined air barrier and liquid sequencing means comprising a housing having a first chamber which constitutes a portion of said primary tube and has inlet and oulet ports thereto and a second chamber which constitutes a portion of said secondary tube and has inlet and outlet ports thereto, said housing including;

    valve means proximate said outlet port from said second chamber into said first chamber, said valve means being constructed and arranged for permitting the passage of said secondary liquid from said second chamber into said first chamber and for preventing of the passage of air from said second chamber into said first chamber when said secondary liquid is not being dispensed;

    check valve means operatively associated with said first chamber for the prevention of primary liquid flow through said primary tube whenever said secondary liquid is being dispensed, and vent means operatively associated with said second chamber for permitting the passage of air from said combined air barrier and liquid sequencing valve, thereby permitting priming of said system.

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