Occlusion detection method and system for ambulatory drug infusion pump
First Claim
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1. A method of detecting an occlusion within a flexible infusion tube, comprising the steps of:
- measuring a first sample indicating a pressure in the tube relative to a first instance in time;
measuring a second sample indicating a pressure in the tube relative to a second instance in time;
measuring a third sample indicating a pressure in the tube relative to a third instance in time;
creating a first difference value of the first sample to the second sample;
creating a second difference value of the second sample to the third sample;
comparing the first difference value to a percentage of the second difference value; and
generating an occlusion signal in response to the step of comparing the first difference value to the second difference value.
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Abstract
A method of detecting an occlusion within a flexible infusion tube by measuring samples indicative of pressures relative to instances in time. Difference values for the samples are created. The difference values are compared to percentages of other difference values. When appropriate, an occlusion signal is generated in response to a comparison of a difference value to a percentage of another difference value.
10 Citations
47 Claims
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1. A method of detecting an occlusion within a flexible infusion tube, comprising the steps of:
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measuring a first sample indicating a pressure in the tube relative to a first instance in time;
measuring a second sample indicating a pressure in the tube relative to a second instance in time;
measuring a third sample indicating a pressure in the tube relative to a third instance in time;
creating a first difference value of the first sample to the second sample;
creating a second difference value of the second sample to the third sample;
comparing the first difference value to a percentage of the second difference value; and
generating an occlusion signal in response to the step of comparing the first difference value to the second difference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of detecting an occlusion within a flexible infusion tube, comprising the steps of:
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measuring a first sample indicating a pressure in the tube relative to a first instance in time;
measuring a second sample indicating a pressure in the tube relative to a second instance in time;
creating a first difference value of the first sample to a second sample;
comparing the first difference value to a percentage of a second difference value; and
generating an occlusion signal in response to the step of comparing the first difference value to a second difference value. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An occlusion detection system for detecting occlusions inhibiting a fluid flowing in a tube adapted for connection to a fluid pump, the occlusion detection system comprising:
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a pressure sensor for releasable attachment to the tube upstream of the fluid pump for monitoring a negative pressure condition;
a transducer operably attached to the pressure sensor, the transducer converting the monitored negative pressure condition in a fluid tube into a usable signal; and
an alarm module for signaling that the occlusion has occurred in response to the alarm module receiving the useable signal from the transducer, the signal indicating that the negative pressure condition is outside an acceptable range. - View Dependent Claims (44, 45, 46)
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47. The system according to 46 wherein the signaling of an upstream occlusion may be over a network.
Specification