OCCLUSION DETECTION SYSTEM
First Claim
1. A method of monitoring pressure inside a fluid line, comprising the steps of:
- measuring a force value caused by a pressure inside the fluid line;
collecting and storing force values during at least two time windows;
calculating a slope of a best-fit line based upon the force values within each time window;
calculating a slope difference between the slopes of the best-fit lines;
comparing the slope difference with a pre-determined threshold gradient value;
defining a baseline force as the measured force value when the slope difference is at least equal to the threshold gradient value;
calculating a relative force value by subtracting the baseline force from the measured force value; and
,initiating an alarm if the relative force value is greater than a value of the pre-defined threshold force value.
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Accused Products
Abstract
A method of monitoring pressure inside a fluid line and a system for implementing the method. The method is applicable to syringe pump systems. The method includes the steps of measuring a force value caused by a pressure inside the fluid line; collecting the measured force values during at least two consecutive moving time windows; calculating a slope of a best-fit line within each time window; calculating a slope difference of the slopes of the best-fit lines; comparing the slope difference with a pre-determined threshold gradient value; defining a baseline force as the detected force value when the slope difference is equal to the threshold gradient value; determining a relative force value by subtracting the baseline force from the detected force value; and, triggering an alarm if the relative force is greater than a pre-defined threshold force
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Citations
20 Claims
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1. A method of monitoring pressure inside a fluid line, comprising the steps of:
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measuring a force value caused by a pressure inside the fluid line; collecting and storing force values during at least two time windows; calculating a slope of a best-fit line based upon the force values within each time window; calculating a slope difference between the slopes of the best-fit lines; comparing the slope difference with a pre-determined threshold gradient value; defining a baseline force as the measured force value when the slope difference is at least equal to the threshold gradient value; calculating a relative force value by subtracting the baseline force from the measured force value; and
,initiating an alarm if the relative force value is greater than a value of the pre-defined threshold force value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of monitoring pressure inside a fluid line, comprising the steps of:
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measuring a force value caused by a pressure inside the fluid line; collecting and storing force values during at least two time windows; calculating a slope of a best-fit line based upon the force values within each time window, wherein the best-fit line is obtained by a linear regression equation; calculating a slope difference between the slopes of the best-fit lines; comparing the slope difference with a pre-determined threshold gradient value; defining a baseline force as the measured force value when the slope difference is at least equal to the threshold gradient value; calculating a baseline pressure value corresponding to the baseline force value; calculating a current pressure value from the measured force value; calculating a relative pressure value by subtracting the baseline pressure value from the current pressure value; comparing the relative pressure value to a pre-determined pressure threshold value; and initiating an alarm if the current pressure value is greater than the pre-determined pressure threshold value. - View Dependent Claims (15, 16)
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17. An occlusion detection system comprising:
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a pump having a sensor operatively connected to a fluid line for delivering fluid for the pump, and a processor, wherein the processor; uses at least two consecutive moving time windows to process measured force values detected by the sensor; calculates a slope of a best-fit line for the measured force values collected within each time window, calculates a slope difference of the slopes of the best-fit lines; selects a threshold gradient value based on the size of the syringe; compares the slope difference to the threshold gradient value; defines a baseline force value as the measured force value when the slope difference is equal to the threshold gradient value; compares the measured force value with the baseline force value to calculate a relative force value; and
,initiates an alarm if the relative force value exceeds a pre-determined threshold force value. - View Dependent Claims (18, 19, 20)
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Specification