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MEDICAL ADMINISTRATION SET FOR DISPENSING PLURAL MEDICAL LIQUIDS

  • US 3,886,937 A
  • Filed: 05/07/1973
  • Issued: 06/03/1975
  • Est. Priority Date: 02/12/1971
  • Status: Expired due to Term
First Claim
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1. In a system for administering two liquids which includes an administration tube with an upper liquid receiving end, a lower dispensing end, a drip housing between the administration tube ends, a side port below the drip housing, and the system has a secondary tube with an upper liquid receiving end and a lower end connected to the side port of the administration tube, the improvement which comprises:

  • A first non-pressurized liquid container having liquid therein and connected to the upper end of the administration tube;

    a second non-pressurized liquid container having liquid therein and connected to an upper end of the second tube;

    a valve in the administration tube between the drip housing and side port, which valve has a movable internal structure that is normally closed when liquid pressure at opposite ends of the valve are equal, but which valve'"'"''"'"'s internal structure moves to open a passage for liquid flow at a rate of 250 ml/hr with a pressure drop of less than 20 inches of water applied across the valve caused by liquid in the second container dropping below the liquid level in the first container by a distance of less than 20 inches;

    a puncturable resealable diaphragm closing off the side port;

    a tubular cannula connected to a lower end of the second tube and extending through the diaphragm; and

    there is a flow regulator on the administration tube between the side port and lower dispensing end for maintaining a generally constant liquid flow rate from either of the two non-pressurized containers.

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