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

• Current Assignee: General Electric Capital Corporation (General Electric Company)
• Original Assignee: Charles J. Mcphee, Donald E. Bobo
• Inventors: McPhee, Charles J., Bobo, Donald E.
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US05/357,677
• Time in Patent Office: 757 Days
• Field of Search: 128/214R,214C,214.2,227,213 222/57,129.2,145 137/113,525.3
• US Class Current: 604/81
• CPC Class Codes: A61M 5/1408 in parallel, e.g. manifolds, sequencing valves access sites A61M39/02; tube connectors A61M39/10
• CPC Class Codes: F16K 15/147 the closure elements having specially formed slits or being of an elongated easily collapsible form
• CPC Class Codes: F16K 15/1472 the closure elements being fixed onto an internally extending mount
• CPC Class Codes: Y10T 137/2569 Control by depletion of source
• CPC Class Codes: Y10T 137/7879 Resilient material valve
• CPC Class Codes: Y10T 137/7886 Internally extending mount

Abstract

A tubular '"'"''"'"''"'"''"'"'Y'"'"''"'"''"'"''"'"' administration set for sequentially delivering a plurality of medical liquids to a patient over prolonged periods of time. A low pressure responsive valve located in a first arm of the '"'"''"'"''"'"''"'"'Y'"'"''"'"''"'"''"'"' set, has a movable internal structure that automatically opens and closes the first arm in response to changes in relative surface level heights of two gravity feed liquids supplied to the set'"'"''"'"'s first and second arms. As these relative surface levels change, the valve'"'"''"'"'s movable internal structure automatically goes through an open-close-open sequence to cause flow from the arms to the leg in a first-second-first arm sequence.

Claims

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.

2. The combination according to claim 1, wherein the valve includes an expandable member with two resilient reed portions that converge toward each other in a direction from the liquid receiving end to the side port of the administration tube.

3. The combination according to claim 1, wherein the valve has a valve seat;

a rigid post in close proximity to the valve seat; and

a resilient disc engaging the rigid post and urged by the post against the valve seat.