Detecting conditions associated with medical device operations using matched filters
First Claim
1. A method of detecting a condition associated with operation of a fluid infusion device, the method comprising:
- obtaining an output indicative of a characteristic influenced by the operation of a fluid infusion device from a sensing arrangement;
interpolating the output of the sensing arrangement to obtain correlated output values comprising estimated output values for intermediate values of an analysis domain variable between analysis domain variable values corresponding to the output, wherein the analysis domain variable is associated with a matched filter corresponding to the condition;
applying the matched filter to the correlated output values to calculate a filtered output as a weighted sum of the respective correlated output values using filter coefficient values of the matched filter as weighting factors for the respective correlated output values; and
detecting the condition based on the filtered output.
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Abstract
Apparatus are provided for infusion devices and related operating methods. An exemplary device includes a sensing arrangement to provide an output indicative of a characteristic that is influenced by operation of the device, and a control module that is coupled to the sensing arrangement to apply a matched filter corresponding to a condition associated with the operation of the device to the output of the sensing arrangement and detect that condition based on the filtered output. In one example, the device includes a motor coupled to a plunger of a reservoir and operable to displace the plunger, wherein the characteristic is a force opposing displacement of the plunger and the control module detects an occlusion condition in a fluid path from the reservoir based on filtered force measurements.
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Citations
18 Claims
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1. A method of detecting a condition associated with operation of a fluid infusion device, the method comprising:
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obtaining an output indicative of a characteristic influenced by the operation of a fluid infusion device from a sensing arrangement; interpolating the output of the sensing arrangement to obtain correlated output values comprising estimated output values for intermediate values of an analysis domain variable between analysis domain variable values corresponding to the output, wherein the analysis domain variable is associated with a matched filter corresponding to the condition; applying the matched filter to the correlated output values to calculate a filtered output as a weighted sum of the respective correlated output values using filter coefficient values of the matched filter as weighting factors for the respective correlated output values; and detecting the condition based on the filtered output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of detecting an occlusion condition associated with operation of a fluid infusion device including a motor operable to displace a plunger of a reservoir to deliver fluid, the method comprising:
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obtaining a force measurement output indicative of a force opposing displacement of the plunger from a force sensing arrangement; interpolating the force measurement output to obtain correlated force measurements comprising estimated force measurement values for intermediate values of motor steps between respective motor steps corresponding to the force measurement output, resulting in correlated force measurements; applying a matched filter corresponding to the occlusion condition to the correlated force measurements to calculate a filtered force measurement as a weighted sum of the respective correlated force measurements using filter coefficient values of the matched filter as weighting factors for the respective correlated force measurements; and detecting the occlusion condition based on the filtered force measurement. - View Dependent Claims (11, 12, 13, 14)
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15. A method of detecting a leakage condition associated with operation of a fluid infusion device including a motor operable to displace a plunger of a reservoir to deliver fluid, the method comprising:
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obtaining a volume measurement output indicative of a remaining volume of fluid in the reservoir from a volume sensing arrangement; interpolating the volume measurement output to obtain correlated volume measurements comprising estimated volume measurement values for intermediate values of motor steps between respective motor steps corresponding to the volume measurement output, resulting in correlated volume measurements; applying a matched filter corresponding to the leakage condition to the correlated volume measurements to calculate a filtered volume measurement as a weighted sum of the respective correlated volume measurements using filter coefficient values of the matched filter as weighting factors for the respective correlated volume measurements; and detecting the leakage condition based on the filtered volume measurement. - View Dependent Claims (16, 17, 18)
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Specification