Fluid control system and disposable assembly
First Claim
1. A fluid delivery system comprising:
- a fluid delivery assembly including an inlet, an outlet, a pneumatic pump, a fluid flow resistor, and a fluid pathway, the fluid pathway extending between the inlet and the outlet, the fluid flow resistor disposed in the fluid pathway, the pneumatic pump being a diaphragm pump;
a pressure sensor to monitor a pressure of gas applied to a pumping chamber of the pneumatic pump, application of the pressure causing the diaphragm pump to pump fluid through the fluid pathway from the inlet to the outlet;
a controller to control a flow rate of the fluid through the fluid pathway, the controller operable to control the pressure of the gas and control a setting of the fluid flow resistor, the controller operable to adjust the setting of the fluid flow resistor to deliver the fluid through the fluid pathway out of the outlet to a recipient, the fluid flow resistor incrementally adjustable by the controller in a range between a full open setting and a full closed setting to control the flow rate as indicated by a received flow rate setting, incremental adjustment of the setting of the fluid flow resistor by the controller operable to produce a corresponding incremental adjustment to the flow rate;
the controller further operable to determine changes to the pressure of the gas and apply the changes to the pressure of the gas to control the flow rate of the fluid through the fluid pathway;
wherein the flow rate of the fluid through the fluid pathway is calculated by;
measuring the pressure of the gas applied to the pumping chamber of the diaphragm pump, measuring pressure of gas in a chamber of known volume, and then calculating a respective volume of the pumping chamber of the diaphragm pump over time based on the pressure of the gas applied to the pumping chamber and the known volume; and
wherein the changes to the pressure represent an adjustment applied to the setting of the pressure of the gas in order to match the flow rate of the fluid through the fluid pathway to the received flow rate setting.
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Accused Products
Abstract
A system for controlled delivery of medicinal fluid includes a fluid pathway assembly defining a fluid pathway and including means for calculating a first calculated fluid flow rate using gas laws. The fluid pathway assembly has an inline flow sensor element received within the fluid pathway movable in response to fluid flowing in the fluid pathway. A flow control device is removably attached to the fluid pathway assembly and has a sensor for sensing a position of the inline flow sensor element in the fluid pathway, the position of the inline flow sensor element being representative of a second calculated fluid flow rate. The fluid pathway assembly includes a variable flow resistor adjustable to regulate a rate of fluid flow in the fluid pathway assembly. A drive mechanism attached to the flow control device is operably coupled to the variable flow resistor when the flow control device is attached to the fluid pathway assembly. The variable flow resistor is adjustable by the drive mechanism to achieve a target flow rate when the first calculated flow rate and/or the second calculated flow rate differs from the target flow rate.
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Citations
48 Claims
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1. A fluid delivery system comprising:
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a fluid delivery assembly including an inlet, an outlet, a pneumatic pump, a fluid flow resistor, and a fluid pathway, the fluid pathway extending between the inlet and the outlet, the fluid flow resistor disposed in the fluid pathway, the pneumatic pump being a diaphragm pump; a pressure sensor to monitor a pressure of gas applied to a pumping chamber of the pneumatic pump, application of the pressure causing the diaphragm pump to pump fluid through the fluid pathway from the inlet to the outlet; a controller to control a flow rate of the fluid through the fluid pathway, the controller operable to control the pressure of the gas and control a setting of the fluid flow resistor, the controller operable to adjust the setting of the fluid flow resistor to deliver the fluid through the fluid pathway out of the outlet to a recipient, the fluid flow resistor incrementally adjustable by the controller in a range between a full open setting and a full closed setting to control the flow rate as indicated by a received flow rate setting, incremental adjustment of the setting of the fluid flow resistor by the controller operable to produce a corresponding incremental adjustment to the flow rate; the controller further operable to determine changes to the pressure of the gas and apply the changes to the pressure of the gas to control the flow rate of the fluid through the fluid pathway; wherein the flow rate of the fluid through the fluid pathway is calculated by;
measuring the pressure of the gas applied to the pumping chamber of the diaphragm pump, measuring pressure of gas in a chamber of known volume, and then calculating a respective volume of the pumping chamber of the diaphragm pump over time based on the pressure of the gas applied to the pumping chamber and the known volume; andwherein the changes to the pressure represent an adjustment applied to the setting of the pressure of the gas in order to match the flow rate of the fluid through the fluid pathway to the received flow rate setting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification