Pump system with error detection for clinical nutrition
First Claim
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1. A pump system for administering a liquid from a container to a patient, the system comprising:
- a flow set comprising;
a) a tubing set having an upstream end and a downstream end, the upstream end being connectable to the container for delivery of liquid to the patient, andb) a one-way valve system coupled to the tubing set which permits liquid flow to the patient when a pressure differential over the valve exceeds a threshold pressure, and which prevents back flow;
a pump coupled to the flow set upstream from the one-way valve, the pump including;
a sensing means for sensing a parameter indicative of the pressure in the flow set between the pump and the one-way valve; and
a controller having a computing and memory means for determining deviation of the parameter from a standard, the deviation being indicative of an error in the flow set including omission of or reverse assembly of the one-way valve system or use of a one-way valve system having an incorrect threshold pressure.
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Abstract
A pump for delivering a liquid from a container to a patient through a flow set. The pump includes a sensing means and a controller. The sensing means senses a parameter indicative of the pressure in the flow set. The controller has a computing and memory means for determining deviation of the parameter from a standard. Deviation is indicative of an error in the flow set. This enables supervising staff to be alerted. These errors may be incorrect assembly of the system or one of its components, inclusion in the system of an incorrect valve, impairment in the integrity of the flow set, and the existence of air bubbles in the system.
85 Citations
14 Claims
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1. A pump system for administering a liquid from a container to a patient, the system comprising:
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a flow set comprising; a) a tubing set having an upstream end and a downstream end, the upstream end being connectable to the container for delivery of liquid to the patient, and b) a one-way valve system coupled to the tubing set which permits liquid flow to the patient when a pressure differential over the valve exceeds a threshold pressure, and which prevents back flow; a pump coupled to the flow set upstream from the one-way valve, the pump including; a sensing means for sensing a parameter indicative of the pressure in the flow set between the pump and the one-way valve; and a controller having a computing and memory means for determining deviation of the parameter from a standard, the deviation being indicative of an error in the flow set including omission of or reverse assembly of the one-way valve system or use of a one-way valve system having an incorrect threshold pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pump system for administering a liquid from a container to a patient, the system comprising:
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flow set comprising a tubing set having an upstream end and a downstream end, the downstream end being connectable to the container for delivery of liquid to the patient, and a one-way valve system coupled to the tubing set, the valve system including a valve having a liquid flow path sealed by a resilient membrane, the membrane being deformable in a desired flow direction at or above a threshold pressure for opening perforations in the membrane to permit liquid flow to the patient when a pressure differential over the valve exceeds a threshold pressure, and which prevents back flow; a pump coupled to the flow set upstream from the one-way valve, the pump including; a sensing means for sensing a parameter indicative of the pressure in the flow set between the pump and the one-way valve; and a controller having a computing and memory means for determining deviation of the parameter from a standard, the deviation being indicative of an error in the flow set including omission of or reverse of the one-way valve system or use of a one-way valve system having an incorrect threshold pressure. - View Dependent Claims (8, 9, 10, 11)
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12. A method for administering a liquid from a container to patient using a pump system, the method comprising:
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pumping liquid through a flow set from the container to the patient through a one-way valve system positioned downstream of the pump system, the one-way valve system permitting flow to the patient when a pressure differential over the valve system exceeds a threshold pressure, and which prevents back flow; and intermittently entering a test phase comprising; pumping a first test amount of liquid in a first direction and then pumping a second test amount of liquid in an opposite direction, sampling a parameter indicative of pressure within the flow set between the pump system and the one-way valve system during pumping of the first test amount of liquid and during pumping of second test amount of liquid, and comparing the sampled parameters to a standard indicative of correct connection of a one-way valve system having a selected threshold pressure in the flow set and, upon determining a difference of selected magnitude between the sampled parameters and the standard, indicating the existence of an error in the pump system. - View Dependent Claims (13, 14)
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Specification