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, after each measurement in the series of measurements is taken, the controller performs a comparison between the measurement taken and a predetermined threshold value before the next measurement in the series of measurements is taken, wherein, if the comparison indicates that the measurement taken is less than the predetermined threshold value, the controller determines that there is no occlusion, and said fluid is delivered to the user'"'"'s body, wherein, if the comparison indicates that the measurement taken is greater than the predetermined threshold value, then an additional measurement of said parameter is taken, up to a predetermined total number of measurements, and wherein, if the additional measurement is greater than the predetermined threshold value and the predetermined total number of measurements has been reached, the controller;
(a) calculates a weighted average of the total number of measurements, (b) compares the weighted average to a comparison value, and (c) determines whether an occlusion has occurred in the fluid path of the infusion pump by determining whether the weighted average is greater than the comparison 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.
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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, after each measurement in the series of measurements is taken, the controller performs a comparison between the measurement taken and a predetermined threshold value before the next measurement in the series of measurements is taken, wherein, if the comparison indicates that the measurement taken is less than the predetermined threshold value, the controller determines that there is no occlusion, and said fluid is delivered to the user'"'"'s body, wherein, if the comparison indicates that the measurement taken is greater than the predetermined threshold value, then an additional measurement of said parameter is taken, up to a predetermined total number of measurements, and wherein, if the additional measurement is greater than the predetermined threshold value and the predetermined total number of measurements has been reached, the controller;
(a) calculates a weighted average of the total number of measurements, (b) compares the weighted average to a comparison value, and (c) determines whether an occlusion has occurred in the fluid path of the infusion pump by determining whether the weighted average is greater than the comparison value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification