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Dual flow rate intravenous administration set with single pump chamber

  • US 4,451,255 A
  • Filed: 05/20/1982
  • Issued: 05/29/1984
  • Est. Priority Date: 05/20/1982
  • Status: Expired due to Fees
First Claim
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1. An intravenous administration set for pumping liquid from at least two separate source by means of a single pumping device comprising:

  • a pump chamber having inlet and outlet ports in communication with a cavity portion with means to vary the volume of said cavity to effect a flow of liquid from said inlet port and out said outlet port;

    first and second lengths of flexible I.V. tubing in fluid-tight communication with said inlet and outlet ports, respectively;

    means to attach an intravenous needle connected to said second length of tubing opposite said chamber;

    third and fourth lengths of flexible I.V. tubing;

    container connection means operatively associated with said third and fourth lengths of flexible tubing;

    backcheck valve means including a valve body with interconnected fluid passage means for fluid-tight communication with said first, third and fourth lengths of flexible tubing, said valve body including liquid flow control means to selectively control the flow of liquid in said one of said third and fourth lengths of tubing in response to liquid flow in the other; and

    flow restriction or interruption means defined by a body section with a flow passage operatively connected to said first length of tubing and positioned between said backcheck valve means and pump chamber to restrict or interrupt fluid flow therein,so that when the volume of said pump chamber cavity is reduced by a pumping device, any reduction in pressure will not be transmitted through said first length of tubing to said backcheck valve means.

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