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US 4,946,448 AGranted
Check valve for use with intravenous pump
AssigneeKendall McGaw Laboratories, Inc.
InventorDouglas S. Richmond
Life of this patent
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AssigneeKendall McGaw Laboratories, Inc.
InventorDouglas S. Richmond
Estimating the term…
A medical liquid administration set is provided with a check valve which is configured to relieve excess pressure downstream from the check valve. The check valve includes a resilient valve disc and a valve seat, which engages the disc when the valve is closed. The administration set includes primary and secondary liquid sources connected through a Y-connector to a pump, which pumps liquids sequentially from the first and second sources to a patient. The check valve is disposed in the set between the Y-connector and the primary liquid source and is in its closed position with the valve disc on the valve seat when the liquid level in the secondary liquid source is higher than the liquid level in the primary source to thereby prevent backflow of liquid from the secondary source into the primary. The check valve is in its open position, allowing flow from the primary source to the patient when the liquid level in the secondary source has fallen to the level of liquid in the primary source. The valve disc is of a resilient material, and a slit is through the disc so that when the downstream pressure is greater than the upstream pressure by a selected value, the slit is forced open to relieve the excessive pressure.
A check valve for incorporation into a liquid supply system for preventing flow from a location in the system downstream from the check valve to a location upstream from the check valve when the downstream pressure is greater than the upstream pressure by no more than a selected value, the check valve comprising:
In a check valve for preventing liquid flow from downstream thereof to upstream thereof when the downstream pressure is greater than the upstream pressure by no more than a selected value, the check valve comprising a flexible valve disc, a housing comprising a lower housing member connected to an upper housing member, wherein the lower housing member includes means for supporting the valve disc when the valve is open, to thereby permit liquid flow from upstream thereof to downstream thereof and wherein the upper housing member includes a valve seat for engaging the valve disc when the valve is closed, the improvement comprising means formed in the valve disc for relieving downstream pressure when the downstream pressure exceeds the upstream pressure by the selected value.
A medical liquid administration set for administering first and second liquids to a patient comprising:
Dependencies are inferred from the claim text.