DETECTING CONDITIONS ASSOCIATED WITH MEDICAL DEVICE OPERATIONS USING MATCHED FILTERS
First Claim
1. A method of detecting a condition associated with operation of a device, the method comprising:
- obtaining an output indicative of a characteristic influenced by the operation of the device from a sensing arrangement;
correlating the output of the sensing arrangement to an analysis domain variable associated with a matched filter corresponding to the condition, resulting in a correlated output;
applying the matched filter to the correlated output, resulting in a filtered output; 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.
4 Citations
20 Claims
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1. A method of detecting a condition associated with operation of a device, the method comprising:
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obtaining an output indicative of a characteristic influenced by the operation of the device from a sensing arrangement; correlating the output of the sensing arrangement to an analysis domain variable associated with a matched filter corresponding to the condition, resulting in a correlated output; applying the matched filter to the correlated output, resulting in a filtered output; and detecting the condition based on the filtered output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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; correlating the force measurement output to a number of motor steps, resulting in correlated force measurements; applying a matched filter corresponding to the occlusion condition to the correlated force measurements, resulting in a filtered force measurement; and detecting the occlusion condition based on the filtered force measurement. - View Dependent Claims (13, 14, 15, 16)
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17. 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; correlating the volume measurement output to a number of motor steps, resulting in correlated volume measurements; applying a matched filter corresponding to the leakage condition to the correlated volume measurements, resulting in a filtered volume measurement; and detecting the leakage condition based on the filtered volume measurement. - View Dependent Claims (18, 19, 20)
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Specification