Automated drug infusion system with autopriming
First Claim
1. A pumping system for providing positive displacement, volumetric liquid control comprising:
- a liquid supply channel having a liquid supply inlet for receiving liquid from a liquid supply;
a pump included in said liquid supply channel and having a pumping chamber with a pumping chamber inlet and a pumping chamber outlet;
at least one detector, located in said liquid supply channel between the liquid supply inlet and a pumping system outlet, for detecting air in liquid flowing through the liquid supply channel;
a first valve and valve actuator for regulating liquid flow through the liquid supply inlet and a second valve and valve actuator for regulating liquid flow through the pumping system outlet; and
a controller responsive to an output from the detector for controlling the pump, the first valve actuator and the second valve actuator during a bi-directional priming of the liquid supply channel until a quantity of air in liquid within the liquid supply channel corresponds to a predetermined value.
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Accused Products
Abstract
A pumping system for positive displacement, volumetric liquid control includes a pump having a pumping chamber with a pumping chamber inlet and a pumping chamber outlet. The pumping system further includes a liquid supply inlet for receiving liquid from a liquid supply, and an detector for detecting air in liquid flowing through the liquid path. A liquid valve actuator regulates liquid flow through the liquid supply inlet and a second valve actuator regulates liquid flow through the pumping system outlet. A controller is responsive to an output from the detector to control the pump, the first valve actuator and the second valve actuator such that liquid is directed through the liquid supply inlet and the pumping system outlet during an initial priming sequence until the quantity of air in liquid at the pumping system outlet corresponds to a predetermined value.
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Citations
27 Claims
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1. A pumping system for providing positive displacement, volumetric liquid control comprising:
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a liquid supply channel having a liquid supply inlet for receiving liquid from a liquid supply; a pump included in said liquid supply channel and having a pumping chamber with a pumping chamber inlet and a pumping chamber outlet; at least one detector, located in said liquid supply channel between the liquid supply inlet and a pumping system outlet, for detecting air in liquid flowing through the liquid supply channel; a first valve and valve actuator for regulating liquid flow through the liquid supply inlet and a second valve and valve actuator for regulating liquid flow through the pumping system outlet; and a controller responsive to an output from the detector for controlling the pump, the first valve actuator and the second valve actuator during a bi-directional priming of the liquid supply channel until a quantity of air in liquid within the liquid supply channel corresponds to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for providing positive displacement, volumetric liquid control comprising:
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a liquid supply channel having it liquid inlet and a liquid outlet; means for detecting air in liquid within the liquid supply channel; and means for providing bi-directional control of liquid flow within the liquid supply channel between the liquid inlet and the liquid outlet until the quantity of air in liquid within the liquid supply channel corresponds to a predetermined value during priming of the liquid supply channel. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for providing positive displacement, volumetric control of liquid comprising the steps of:
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establishing a liquid path between a liquid inlet and a liquid outlet; detecting air in liquid within the liquid supply path during an initial priming of the supply path; and providing bi-direction control of liquid within the liquid supply path until the quantity of air in liquid corresponds to a predetermined value during priming of the liquid supply path. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for priming a positive displacement, volumetric pumping system with liquid from a liquid supply comprising the steps of:
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pumping liquid from the liquid supply to a pumping system outlet; detecting air in liquid at the pumping system outlet and directing liquid to flow toward the liquid supply upon detecting presence of liquid at the pumping system outlet; detecting the quantity of air at a liquid supply inlet, and redirecting liquid flow from the liquid supply to the pumping system outlet when the quantity of air is less than a predetermined value; continuously directing liquid flow from the liquid supply to the pumping system outlet and detecting the quantity of air at the pumping system outlet; and redirecting liquid flow from the pumping system outlet to the liquid supply inlet if the quantity of air at the pumping system outlet exceeds a predetermined value for a set number of pumping strokes within a predetermined period of time. - View Dependent Claims (23, 24, 25, 26)
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27. A method for providing positive displacement, volumetric control of liquid comprising the steps of:
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establishing a liquid supply path between a liquid inlet and a liquid outlet; detecting air in liquid within the liquid supply path during an initial priming of the liquid supply path; and providing bi-directional control of liquid within the liquid supply path until the quantity of air in liquid corresponds to a predetermined value during priming of the liquid supply path, said step of providing further including a step of pumping a predetermined volume of liquid to the liquid outlet upon determining that the quantity of air in liquid at the liquid outlet corresponds to the predetermined value for a set number of pumping strokes.
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Specification