Methods and apparatuses for detecting occlusions in an ambulatory infusion pump
First Claim
1. 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:
- 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.
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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.
163 Citations
9 Claims
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1. 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 (2)
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3. 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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4. The occlusion detection system of 3, wherein the parameter associated with the motor or one of the drive train components is force.
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5. The occlusion detection system of 3, 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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6. The occlusion detection system of 3, 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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- 7. The occlusion detection system of 3, 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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9. The occlusion detection system of 8, 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