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 coupled to a reservoir for infusing fluid from the reservoir into a body of a user, the method comprising:
- measuring a first parameter associated with the motor or one of the drive train components;
measuring a different second parameter associated with the motor or one of the drive train components;
combining the first parameter with the second parameter to create a first combined value; and
determining whether an occlusion has occurred by using the first combined value.
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. 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 measurements of one or more variables, the infusion pump detects whether there is an occlusion in the system. The methods of detecting occlusions may be dynamic.
312 Citations
50 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 coupled to a reservoir for infusing fluid from the reservoir into a body of a user, the method comprising:
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measuring a first parameter associated with the motor or one of the drive train components;
measuring a different second parameter associated with the motor or one of the drive train components;
combining the first parameter with the second parameter to create a first combined value; and
determining whether an occlusion has occurred by using the first combined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 36)
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9. 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 adapted to measure at least two different parameters associated with the motor or one of the drive train components; and
a processor contained within the housing and adapted to combine the at least two parameters associated with the motor or one of the drive train components and to determine whether an occlusion has occurred in the fluid path of the infusion pump using the combined parameters. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An occlusion detection system for detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components, the occlusion detection system comprising:
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means for measuring a first parameter associated with the motor or one of the drive train components;
means for measuring a second parameter associated with the motor or one of the drive train components;
means for combining the first parameter with the second parameter to create a first combined value; and
means for determining whether an occlusion has occurred in the infusion pump by using the first combined value. - View Dependent Claims (16)
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17. 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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measuring a parameter associated with the motor or one of the drive train components periodically during delivery of a current pulse of infusion fluid 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; and
determining whether an occlusion has occurred based upon the peak value, the second value, and a threshold value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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37. 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 motor contained within the housing;
one or more drive train components coupled to the motor within the housing and adapted to move in response to the motor to deliver fluid from the reservoir through a fluid path into the body of the user;
a sensor adapted to periodically measure a parameter associated with the motor or one of the drive train components during delivery of a current pulse of infusion fluid to obtain a series of measurements; and
a processor contained within the housing and adapted to determine a peak value of the series of measurements, select a second value later than the peak value from the series of measurements, and determine whether an occlusion has occurred in the fluid path of the infusion pump using the peak value, the second value, and a threshold value. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. An occlusion detection system for detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components, the occlusion detection system comprising:
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means for measuring a parameter associated with the motor or one of the drive train components periodically during delivery of a current pulse of infusion fluid to obtain a series of measurements;
means for determining a peak value of the series of measurements;
means for selecting a second value within the series of measurements after the peak value; and
means for determining whether an occlusion has occurred using the peak value, the second value, and a threshold value.
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45. The occlusion detection system of 44, wherein the parameter associated with the motor or one of the drive train components is force.
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46. The occlusion detection system of 44, wherein the means for measuring a parameter associated with the motor or one of the drive train components measures the parameter continuously during the delivery of the current pulse of infusion fluid.
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47. The occlusion detection system of 44, wherein the means for determining whether an occlusion has occurred is adapted to:
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calculate a difference between the peak value and the second value; and
declare an occlusion if the difference exceeds the threshold value.
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- 48. The occlusion detection system of 44, wherein the means for measuring a parameter associated with the motor or one of the drive train components is further adapted to measure the parameter before the delivery of the current pulse of infusion fluid to obtain a third value.
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50. The occlusion detection system of 49, further comprising means for dynamically updating the threshold value based on measurements of the parameter associated with the motor or one of the drive train components during delivery of at least one previous pulse of infusion fluid before the delivery of the current pulse of infusion fluid.
Specification