Intravenous metering device
First Claim
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1. A device which meters fluids for delivery from a source of fluid to a patient, comprising:
- an air retention chamber having upper and lower portions, the upper portion having an inlet in fluid communication with the source of fluid, the lower portion having an outlet in fluid communication with a fluid passageway;
a pumping chamber having an inlet and an outlet, the inlet being in fluid communication with the fluid passageway, the pumping chamber inlet including a first valve means to control the entry of fluid into the pumping chamber, the pumping chamber outlet including a second valve having an outlet pressure chamber in fluid communication with the pumping chamber and having a diaphragm as an upper wall;
a standpipe prestressed against the diaphragm; and
means for varying the volume of the pumping chamber to pressurize the pumping chamber;
such that in response to an increase in the pumping chamber pressure when sufficient fluid pressure is present in the outlet fluid pressure chamber the diaphragm is lifted off of the standpipe by the fluid pressure thereby opening the second valve.
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Abstract
An intravenous metering device is provided which includes an air retention chamber in downstream fluid communication with a source of fluid and in upstream fluid communication with a pumping chamber. A first valve is provided between the air retention chamber and the pumping chamber to control access to the pumping chamber. A second valve is provided to control the exit of fluid from the pumping chamber. The valves include a shared diaphragm portion.
36 Citations
17 Claims
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1. A device which meters fluids for delivery from a source of fluid to a patient, comprising:
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an air retention chamber having upper and lower portions, the upper portion having an inlet in fluid communication with the source of fluid, the lower portion having an outlet in fluid communication with a fluid passageway; a pumping chamber having an inlet and an outlet, the inlet being in fluid communication with the fluid passageway, the pumping chamber inlet including a first valve means to control the entry of fluid into the pumping chamber, the pumping chamber outlet including a second valve having an outlet pressure chamber in fluid communication with the pumping chamber and having a diaphragm as an upper wall; a standpipe prestressed against the diaphragm; and means for varying the volume of the pumping chamber to pressurize the pumping chamber; such that in response to an increase in the pumping chamber pressure when sufficient fluid pressure is present in the outlet fluid pressure chamber the diaphragm is lifted off of the standpipe by the fluid pressure thereby opening the second valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device which meters fluids for delivery from a source of fluid to a patient, comprising:
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an air retention chamber having an inlet and an outlet, the inlet being in fluid communication with the source of fluid, the outlet being in communication with a fluid passageway; a pumping chamber having an inlet and an outlet, the inlet being in fluid communication with the fluid passageway, the pumping chamber inlet including a first flexible diaphragm valve to control the entry of fluid into the pumping chamber, the pumping chamber outlet including a second valve having an outlet chamber in fluid communication with the pumping chamber and having a diaphragm as an upper wall; a standpipe prestressed against the diaphragm; and means for varying the volume of the pumping chamber to pressurize the pumping chamber; such that in response to an increase in pressure in the pumping chamber when sufficient fluid pressure is present in the outlet fluid pressure chamber the diaphragm is lifted off of the standpipe by the fluid pressure thereby opening the second valve. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification