Flow control in an intravenous fluid delivery system
First Claim
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1. A system for control of the flow of an intravenous fluid in an intravenous tubing, the system comprising:
- a body for retaining an intravenous tubing;
a movable element cooperative with the body to engage an outer wall portion of the tubing disposed in the body and to squeeze the tubing to vary an orifice size of the tubing;
a transducer operative to provide a signal representative of force applied by the movable element to the tubing; and
control apparatus operative in response to the signal from the transducer to drive the movable element to a position to produce an orifice size needed to obtain the intended flow rate of intravenous fluid in the tubing.
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Abstract
An intravenous flow control system provides closed loop control to maintain a desired flow rate. The actual flow rate is determined by two techniques, a geometrically based technique that uses geometric parameters of the IV system, and a thermally based technique that uses the power input to an IV fluid warmer and the temperature of the IV fluid entering and exiting the warmer.
55 Citations
28 Claims
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1. A system for control of the flow of an intravenous fluid in an intravenous tubing, the system comprising:
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a body for retaining an intravenous tubing;
a movable element cooperative with the body to engage an outer wall portion of the tubing disposed in the body and to squeeze the tubing to vary an orifice size of the tubing;
a transducer operative to provide a signal representative of force applied by the movable element to the tubing; and
control apparatus operative in response to the signal from the transducer to drive the movable element to a position to produce an orifice size needed to obtain the intended flow rate of intravenous fluid in the tubing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for controlling flow of an intravenous fluid in an intravenous tubing, comprising:
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retaining an intravenous tubing in a body;
engaging an outer wall portion of the tubing with a movable element to squeeze the tubing to vary an orifice size of the tubing;
providing a signal from a transducer representative of force applied by the movable element to the tubing; and
driving the moveable element to a position to produce an orifice size needed to obtain an intended flow rate of intravenous fluid in the tubing. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification