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Gravitational flow system for the sequential administration of medical liquids

  • US 4,316,460 A
  • Filed: 07/14/1980
  • Issued: 02/23/1982
  • Est. Priority Date: 02/28/1979
  • Status: Expired due to Term
First Claim
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1. A gravitational flow system for the sequential administration of medical liquids to a patient comprising:

  • a primary container suspended in space for containing a primary medical liquid,a primary tube 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,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 path comprising said primary tube and said common tube and a secondary liquid flow path comprising said secondary tube and said common tube,secondary flow control means in said secondary liquid flow path for adjusting the flow rate of said secondary liquid therethrough,primary flow control means on said primary tube for adjusting the flow of said primary liquid through said primary liquid flow path at a rate independent of the flow rate of said secondary liquid through said secondary liquid flow path, anda combined air barrier and liquid sequencing valve interposed in said primary and secondary flow paths which allows primary liquid to flow from said primary container whenever the height of said primary liquid is less 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,said combined air barrier and liquid sequencing valve comprising a housing having an air capturing pocket disposed in the primary liquid flow path through said valve, said air capturing pocket being constructed and arranged for the entrapment of a quantity of air therein during dispensing of secondary liquid whereby the flow of primary liquid is halted.

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