Volume monitoring for implantable fluid delivery devices
First Claim
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1. A therapeutic fluid delivery system comprising:
- a reservoir configured to house a therapeutic fluid;
a pressure sensor configured to measure a pressure of the reservoir; and
a processor configured to determine at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured by the pressure sensor over time and detect an unexpected change in a volume of the therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold,wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the pressure sensor increases.
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Abstract
Unexpected changes in the volume of therapeutic fluid in the reservoir of a fluid delivery device are detected based on changes in the pressure of the reservoir measured over a period of time by a pressure sensor. Additionally, an ambulatory reservoir fluid volume gauge is provided to indicate an actual volume of therapeutic fluid in a fluid delivery device reservoir. The actual volume of therapeutic fluid in the reservoir indicated by the ambulatory reservoir fluid volume gauge is determined based on changes in the pressure in the reservoir measured over a period of time by a pressure sensor.
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Citations
60 Claims
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1. A therapeutic fluid delivery system comprising:
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a reservoir configured to house a therapeutic fluid; a pressure sensor configured to measure a pressure of the reservoir; and a processor configured to determine at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured by the pressure sensor over time and detect an unexpected change in a volume of the therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold, wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the pressure sensor increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method comprising:
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measuring a pressure of a reservoir of a fluid delivery device with a pressure sensor; determining at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured by the pressure sensor over time; and detecting an unexpected change in a volume of therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold, wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the pressure sensor increases. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A non-transitory computer-readable storage medium comprising instructions for causing a programmable processor to:
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cause a pressure sensor to measure a pressure of a reservoir of a fluid delivery device with a pressure sensor; determine at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured by the pressure sensor over time; and detect an unexpected change in a volume of therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold, wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the pressure sensor increases.
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37. A fluid delivery system comprising:
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means for measuring a pressure of a reservoir of a fluid delivery device; means for determining at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured over time by the means for measuring the pressure of the reservoir; and means for detecting an unexpected change in a volume of therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold, wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the means for measuring the pressure of the reservoir increases.
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38. A therapeutic fluid delivery system comprising:
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an outer housing; a reservoir within the outer housing and configured to house a therapeutic fluid; a pressure sensor configured to measure a first pressure of the therapeutic fluid in the reservoir at a first time and a second pressure of the therapeutic fluid in the reservoir at a second time; an ambulatory reservoir fluid volume gauge; and a processor configured to receive the first pressure of the therapeutic fluid in the reservoir and the second pressure of the therapeutic fluid in the reservoir, determine a change in pressure of the therapeutic fluid in the reservoir over time between the first pressure and the second pressure measured by the pressure sensor, determine an actual volume of the therapeutic fluid in the reservoir based on the change in pressure of the therapeutic fluid in the reservoir determined by the processor, and control the ambulatory fluid volume gauge to indicate the actual volume of the therapeutic fluid in the reservoir, wherein the ambulatory reservoir fluid volume gauge comprises a visual representation of the actual volume of the therapeutic fluid in the reservoir. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A method comprising:
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measuring a first pressure of a therapeutic fluid in a reservoir of a fluid delivery device at a first time and a second pressure of the therapeutic fluid in the reservoir at a second time with a pressure sensor; receiving the first pressure of the therapeutic fluid in the reservoir and the second pressure of the therapeutic fluid in the reservoir; determining a change in pressure of the therapeutic fluid in the reservoir over time between the first pressure and the second pressure measured by the pressure sensor; determining an actual volume of therapeutic fluid in the reservoir based on the change in pressure of the therapeutic fluid in the reservoir determined by the processor; and controlling an ambulatory fluid volume gauge to indicate the actual volume of the therapeutic fluid in the reservoir, wherein the ambulatory reservoir fluid volume gauge comprises a visual representation of the actual volume of the therapeutic fluid in the reservoir. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55)
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56. A fluid delivery system comprising:
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means for measuring a first pressure of a therapeutic fluid in a reservoir of a fluid delivery device at a first time and a second pressure of the therapeutic fluid in the reservoir at a second time; means for receiving the first pressure of the therapeutic fluid in the reservoir and the second pressure of the therapeutic fluid in the reservoir; means for determining a change in pressure of the therapeutic fluid in the reservoir over time between the first pressure and the second pressure measured by the pressure sensor; means for determining an actual volume of therapeutic fluid in the reservoir based on the change in pressure of the therapeutic fluid in the reservoir determined by the means for determining the change in pressure of the therapeutic fluid in the reservoir over time; and means for controlling an ambulatory fluid volume gauge to indicate the actual volume of the therapeutic fluid in the reservoir, wherein the ambulatory reservoir fluid volume gauge comprises a visual representation of the actual volume of the therapeutic fluid in the reservoir.
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57. A non-transitory computer-readable storage medium comprising instructions for causing a programmable processor to:
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measure a first pressure of a therapeutic fluid in a reservoir of a fluid delivery device at a first time and a second pressure of the therapeutic fluid in the reservoir at a second time with a pressure sensor; receive the first pressure of the therapeutic fluid in the reservoir and the second pressure of the therapeutic fluid in the reservoir; determine a change in pressure of the therapeutic fluid in the reservoir over time between the first pressure and the second pressure measured by the pressure sensor; determine an actual volume of therapeutic fluid in the reservoir based on the change in pressure of the therapeutic fluid in the reservoir determined by the programmable processor; and control an ambulatory fluid volume gauge to indicate the actual volume of the therapeutic fluid in the reservoir, wherein the ambulatory reservoir fluid volume gauge comprises a visual representation of the actual volume of the therapeutic fluid in the reservoir.
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58. A method comprising:
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measuring a pressure of a therapeutic fluid in a reservoir of a fluid delivery device with a pressure sensor; determining an actual rate at which the therapeutic fluid is delivered from the reservoir based on changes in the pressure of the therapeutic fluid in the reservoir measured by the pressure sensor; integrating the actual rate at which the therapeutic fluid is delivered from the reservoir over a period of time over which changes in the pressure of the therapeutic fluid in the reservoir are measured by the pressure sensor to determine an actual volume of therapeutic fluid in the reservoir; and controlling an ambulatory fluid volume gauge to indicate the actual volume of the therapeutic fluid in the reservoir, wherein the ambulatory reservoir fluid volume gauge comprises a visual representation of the actual volume of the therapeutic fluid in the reservoir. - View Dependent Claims (59, 60)
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Specification