Estimating the volume of fluid in therapeutic fluid delivery device reservoir
First Claim
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1. A method comprising:
- measuring a pressure within a therapeutic fluid reservoir of an implantable fluid delivery device with a first pressure sensor;
measuring a pressure within a chamber of the fluid delivery device at least partially surrounding the reservoir with a second pressure sensor;
estimating a volume of a therapeutic fluid within the reservoir based on a pressure differential between the measured pressure within the reservoir and the measured pressure within the chamber, wherein estimating the volume comprises estimating a rate at which the therapeutic fluid is added to or removed from the reservoir based on the measured pressure within the reservoir and the measured pressure within the chamber; and
displaying an indication of the estimated rate at which the therapeutic fluid is added to or removed from the reservoir.
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Abstract
A number of parameters related to the operation of a fluid delivery device are determined based on pressures within the device sensed using multiple pressure sensors. In one example, the volume of therapeutic fluid within a reservoir of a fluid delivery device is estimated based on a measured pressure differential. In another example, the rate at which a therapeutic fluid is added to or removed from the reservoir is estimated based on the measured pressure differential.
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Citations
26 Claims
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1. A method comprising:
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measuring a pressure within a therapeutic fluid reservoir of an implantable fluid delivery device with a first pressure sensor; measuring a pressure within a chamber of the fluid delivery device at least partially surrounding the reservoir with a second pressure sensor; estimating a volume of a therapeutic fluid within the reservoir based on a pressure differential between the measured pressure within the reservoir and the measured pressure within the chamber, wherein estimating the volume comprises estimating a rate at which the therapeutic fluid is added to or removed from the reservoir based on the measured pressure within the reservoir and the measured pressure within the chamber; and displaying an indication of the estimated rate at which the therapeutic fluid is added to or removed from the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20)
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13. A fluid delivery system comprising:
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an implantable fluid delivery device comprising; a reservoir configured to store a therapeutic fluid; a chamber at least partially surrounding the reservoir; a first pressure sensor configured to sense a pressure within the reservoir; a second pressure sensor configured to sense a pressure within the chamber; a display device; and a processor configured to receive the sensed measurements of the pressure within the reservoir from the first pressure sensor, receive the sensed measurements of the pressure within the chamber from the second pressure sensor, and estimate a volume of a therapeutic fluid within the reservoir based on a pressure differential between the measured pressure within the reservoir and the measured pressure within the chamber, wherein to estimate the volume, the processor is configured to estimate a rate at which the therapeutic fluid is added to or removed from the reservoir based on the measured pressure within the reservoir and the measured pressure within the chamber, and wherein the processor is further configured to control the display device to display an indication of the estimated rate at which the therapeutic fluid is added to or removed from the reservoir. - View Dependent Claims (14, 15, 16, 17, 18, 21, 22, 23, 24)
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25. A computer-readable storage medium comprising instructions for causing a programmable processor to:
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measure a pressure within a therapeutic fluid reservoir of an implantable fluid delivery device with a first pressure sensor; measure a pressure within a chamber of the fluid delivery device at least partially surrounding the reservoir with a second pressure sensor; estimate a volume of a therapeutic fluid within the reservoir based on a pressure differential between the measured pressure within the reservoir and the measured pressure within the chamber, wherein the instructions that cause the processor to estimate the volume comprise instructions that cause the processor to estimate a rate at which the therapeutic fluid is added to or removed from the reservoir based on the measured pressure within the reservoir and the measured pressure within the chamber; and display an indication of the estimated rate at which the therapeutic fluid is added to or removed from the reservoir.
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26. A system comprising:
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a first means for measuring a pressure within a therapeutic fluid reservoir of an implantable fluid delivery device; a second means for measuring a pressure within a chamber of the fluid delivery device at least partially surrounding the reservoir; and means for estimating a volume of a therapeutic fluid within the reservoir based on a pressure differential between the measured pressure within the reservoir and the measured pressure within the chamber, wherein the means for estimating the volume comprises means for estimating a rate at which the therapeutic fluid is added to or removed from the reservoir based on the measured pressure within the reservoir and the measured pressure within the chamber; and means for displaying an indication of the estimated rate at which the therapeutic fluid is added to or removed from the reservoir.
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Specification