Method and device for determining the existence of leaks in a system with flowing fluid
First Claim
1. A method for proving a sensor for flowing fluid in a system including a dialysis monitor, a fluid input, and a fluid output, said method comprising applying a first pressure to said flowing fluid and detecting a first flow of said flowing fluid at said fluid input and said fluid output, applying a second pressure to said flowing fluid and detecting a second flow of said flowing fluid at said fluid input and said fluid output, determining a first difference between said first flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid input, determining a second difference between said first flow of said flowing fluid at said fluid output and said second flow of said flowing fluid at said fluid output, determining a third difference between said first difference and said second difference, determining a fourth difference between said first flow of said flowing fluid at said fluid input and said first flow of said flowing fluid at said fluid output, determining a fifth difference between said second flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid output, and determining whether any detected differences between said first and second flows are the result of leakage in said system or caused by said sensor.
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Abstract
A method and apparatus are disclosed for calibrating a sensor for flowing fluid in a system including a dialysis monitor, a fluid inlet and a fluid outlet, the method including applying a first pressure to the flowing fluid and detecting a first flow of the flowing fluid at the fluid input and the fluid output, applying a second pressure to the flowing fluid and detecting a second flow of the flowing fluid at the fluid input and the fluid output, and determining whether any detected differences between the first and second flows are the result of leakage in the system or are caused by the sensor.
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Citations
12 Claims
- 1. A method for proving a sensor for flowing fluid in a system including a dialysis monitor, a fluid input, and a fluid output, said method comprising applying a first pressure to said flowing fluid and detecting a first flow of said flowing fluid at said fluid input and said fluid output, applying a second pressure to said flowing fluid and detecting a second flow of said flowing fluid at said fluid input and said fluid output, determining a first difference between said first flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid input, determining a second difference between said first flow of said flowing fluid at said fluid output and said second flow of said flowing fluid at said fluid output, determining a third difference between said first difference and said second difference, determining a fourth difference between said first flow of said flowing fluid at said fluid input and said first flow of said flowing fluid at said fluid output, determining a fifth difference between said second flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid output, and determining whether any detected differences between said first and second flows are the result of leakage in said system or caused by said sensor.
- 9. Apparatus for proving a sensor for flowing fluid in a system including a dialysis monitor, a fluid inlet, and a fluid outlet, said apparatus comprising at least one first detecting means for detecting a first flow of said flowing fluid at said fluid input, at least one second detecting means for detecting a second flow of said flowing fluid at said fluid output, pressure means for applying a first pressure to said system in a first phase and a second pressure to said system in a second phase, each of said first and second pressures comprising either a positive pressure or a negative pressure, and said first and second pressures being different pressures, and evaluation means for evaluating said first and second flows, wherein said evaluation means includes means for providing a first difference between said first flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid output, a second difference between said first flow of said flowing fluid at said fluid output and said second flow of said flowing fluid at said fluid output, a third difference between said first difference and said second difference, a fourth difference between said first flow of said flowing fluid at said fluid input and said first flow of said flowing fluid at said fluid output, and a fifth difference between said second flow of said flowing fluid at said fluid input and said second flow of said flowing fluid at said fluid output, and determining means for determining whether said differences are the result of leakage in said system or are caused by said sensor.
Specification