System for measuring change in fluid flow rate within a line
First Claim
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1. A fluid management system for dispensing an amount of a first fluid and monitoring a state of flow of the first fluid, the system comprising:
- a chamber having an inlet and an outlet and a septum separating the first fluid and a second fluid;
an energy imparter for applying a time varying amount of energy on the second fluid;
a transducer for measuring a pressure of the second fluid within the chamber and creating a signal of the pressure; and
a processor for determining change in the first fluid'"'"'s flow rate based on the signal.
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Abstract
A method and system for determining change in a fluid'"'"'s flow rate within a line. The pressure variation in a second fluid, separated from the first by a pumping membrane, is measured in response to energy applied in a time-varying manner to the second fluid. From the response of the second fluid to the applied energy, changes in the flow rate of the first fluid are determined.
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Citations
10 Claims
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1. A fluid management system for dispensing an amount of a first fluid and monitoring a state of flow of the first fluid, the system comprising:
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a chamber having an inlet and an outlet and a septum separating the first fluid and a second fluid;
an energy imparter for applying a time varying amount of energy on the second fluid;
a transducer for measuring a pressure of the second fluid within the chamber and creating a signal of the pressure; and
a processor for determining change in the first fluid'"'"'s flow rate based on the signal. - View Dependent Claims (2, 3, 4, 5)
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6. A fluid management system for dispensing an amount of a first fluid and monitoring a state of flow of the first fluid, the system comprising:
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a chamber having an inlet and an outlet;
a reservoir tank containing a second fluid in fluid communication with the chamber, valve disposed between the reservoir tank and the chamber;
a membrane disposed within the chamber between the first fluid and the second fluid for pumping the first fluid in response to a pressure differential between the first fluid and the second fluid;
a transducer for measuring a pressure of the second fluid within the chamber and creating a signal of the pressure; and
a processor for determining a change in the first fluid'"'"'s flow rate based at least on the signal. - View Dependent Claims (7, 8)
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9. A fluid management system for dispensing an amount of a first fluid and monitoring a state of flow of the first fluid, the system comprising:
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a chamber having an inlet and an outlet;
a reservoir tank containing a second fluid in fluid communication with the chamber, the tank having a valve disposed between the reservoir tank and the chamber;
a membrane disposed within the chamber between the first fluid and the second fluid for pumping the first fluid in response to a pressure differential between the first fluid and the second fluid;
a transducer for measuring the pressure of the second fluid within the chamber and creating a pressure signal; and
a processor for i) receiving the pressure signal;
ii) determining a value corresponding to the derivative with respect to a timing period of the pressure signal creating a derivative value;
iii) determining a value corresponding to the magnitude of the derivative value creating an magnitude derivative;
iv) low pass filtering the magnitude derivative creating a low pass output;
v) comparing the low pass output to a threshold value for determining a change in the first fluid'"'"'s flow rate and vi) causing an indicator signal based on the change in the first fluid'"'"'s flow rate. - View Dependent Claims (10)
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Specification