Method and apparatus for detecting occlusions in an ambulatory infusion pump
First Claim
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1. An infusion pump for infusing fluid from a reservoir into a body of a user, the infusion pump comprising:
- a housing;
a drive mechanism including a motor and one or more drive components contained within the housing and operatively coupled to the reservoir to deliver fluid from the reservoir through a fluid path into the body of the user;
one or more electronic components to take a series of measurements of a parameter associated with the motor or one of the drive train components; and
a controller contained within the housing, wherein the controller calculates a weighted average of the series of measurements by applying a weighting factor to each measurement in the series of measurements to determine a weighted value corresponding to each said measurement and calculating the average of the weighted values, determines the drive count of the motor, determines a drive count value based on the drive count of the motor, calculates a maximum threshold value based on the drive count value, compares the weighted average to the maximum threshold value, and determines whether an occlusion has occurred in the fluid path of the infusion pump by determining whether the weighted average is greater than the maximum threshold value.
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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. A method, system, and an article of manufacture for automatically detecting an occlusion in a medication infusion pump is provided. The electrical current to an infusion pump is measured. Based on a series of measurements of one or more variables, the infusion pump detects whether there is an occlusion in the system.
244 Citations
15 Claims
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1. An infusion pump for infusing fluid from a reservoir into a body of a user, the infusion pump comprising:
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a housing; a drive mechanism including a motor and one or more drive components contained within the housing and operatively coupled to the reservoir to deliver fluid from the reservoir through a fluid path into the body of the user; one or more electronic components to take a series of measurements of a parameter associated with the motor or one of the drive train components; and a controller contained within the housing, wherein the controller calculates a weighted average of the series of measurements by applying a weighting factor to each measurement in the series of measurements to determine a weighted value corresponding to each said measurement and calculating the average of the weighted values, determines the drive count of the motor, determines a drive count value based on the drive count of the motor, calculates a maximum threshold value based on the drive count value, compares the weighted average to the maximum threshold value, and determines whether an occlusion has occurred in the fluid path of the infusion pump by determining whether the weighted average is greater than the maximum threshold value. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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4. The infusion pump of 1, wherein the drive count value is X when the drive count of the motor is within a first range of drive counts, wherein the drive count value is Y when the drive count of the motor is within a second range of drive counts, wherein the drive counts within the first range are less than the drive counts within the second range, and wherein Y is less than X.
Specification