Methods and apparatuses for detecting occlusions in an ambulatory infusion pump
First Claim
1. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
- during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements;
determining a peak value of the series of measurements;
selecting a second value within the series of measurements later than the peak value;
calculating a difference between the peak value and the second value;
incrementing a counter when the difference exceeds a threshold value;
restarting the counter when the difference is below the threshold value; and
declaring an occlusion has occurred when the counter exceeds an occlusion-detection count.
1 Assignment
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Accused Products
Abstract
An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston. Methods, systems, and articles of manufacture for automatically detecting an occlusion in a medication infusion pump are provided. The electrical current to an infusion pump may be measured. Based on measurements of one or more variables, and/or multiple measurements of a single variable, such as force, the infusion pump detects whether there is an occlusion in the system. The methods of detecting occlusions may be dynamic.
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Citations
15 Claims
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1. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
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during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements; determining a peak value of the series of measurements; selecting a second value within the series of measurements later than the peak value; calculating a difference between the peak value and the second value; incrementing a counter when the difference exceeds a threshold value; restarting the counter when the difference is below the threshold value; and declaring an occlusion has occurred when the counter exceeds an occlusion-detection count.
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2. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
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during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements; determining a peak value of the series of measurements; selecting a second value within the series of measurements later than the peak value; calculating a current difference between the peak value and the second value; retrieving a previous difference between a previous peak value and a previous second value later than the previous peak value calculated based on measurements of applied force during delivery of a previous pulse of infusion fluid; calculating an average difference using the previous difference and the current difference; and declaring an occlusion has occurred if the average difference exceeds a threshold value. - View Dependent Claims (3, 4)
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5. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
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during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements; determining a peak value of the series of measurements; selecting a second value within the series of measurements later than the peak value; measuring the amount of applied force before the delivery of the current pulse of infusion fluid to obtain a third value; calculating a first difference between the peak value and the second value; calculating a second difference between the third value and the peak value; and determining whether an occlusion has occurred by comparing the second difference between the third value and the peak value to the first difference between the peak value and the second value. - View Dependent Claims (6)
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7. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
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during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements; determining a peak value of the series of measurements; selecting a second value within the series of measurements later than the peak value; selecting a third value within the series of measurements later than the peak value; calculating a slope of a line using the second and third values; and determining whether an occlusion has occurred by comparing the slope to a threshold value. - View Dependent Claims (8, 9, 10)
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11. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components for infusing fluid into a body of a user, the method comprising:
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during delivery of a current pulse of infusion fluid, periodically measuring the amount of force that is applied to a drive train component to obtain a series of measurements; determining a peak value of the series of measurements; selecting a second value within the series of measurements later than the peak value; calculating a current difference between the peak value and the second value; and declaring an occlusion has occurred if the current difference exceeds a threshold value, wherein the threshold value is dynamically updated based on measurements of applied force during delivery of at least one previous pulse of infusion fluid before the delivery of the current pulse of infusion fluid. - View Dependent Claims (12, 13, 14, 15)
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Specification