System for measuring when fluid has stopped flowing 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 whether the first fluid has stopped flowing based on the signal.
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Abstract
A method and system for determining when a fluid has stopped flowing 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, it is determined whether the first fluid has stopped flowing.
203 Citations
11 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 whether the first fluid has stopped flowing 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 whether the first fluid has stopped flowing based at least on the signal. - View Dependent Claims (7, 8, 9)
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10. 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 that the first fluid has stopped flowing when the low pass output is below the threshold and vi) causing an indicator signal if the first fluid has stopped flowing. - View Dependent Claims (11)
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Specification