Reservoir monitoring for implantable fluid delivery devices
First Claim
1. A method comprising:
- sensing a pressure within a fluid delivery device using a pressure sensor as a therapeutic fluid is added to or removed from a reservoir of the device;
estimating a pressure of the reservoir based on the sensed pressure, an estimated initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure, and an estimated temperature of the therapeutic fluid based on the sensed pressure, wherein the estimated pressure of the reservoir is different than the sensed pressure; and
determining, by a processor, a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir.
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Accused Products
Abstract
A number of parameters related to the operation of a fluid delivery device are determined based on a pressure within the device sensed using a pressure sensor. In one example, the volume of therapeutic fluid added to or removed from a reservoir of a fluid delivery device is determined based on a sensed pressure of the reservoir. In another example, the volume of therapeutic fluid added to or removed from the reservoir is determined based on a sensed pressure of a refill port assembly of the device. In another example, an initial temperature of the reservoir as a therapeutic fluid is removed from the reservoir is estimated based on a sensed pressure within the device. In another example, a temperature of a therapeutic fluid added to the reservoir is estimated based on a sensed pressure within the device.
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Citations
39 Claims
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1. A method comprising:
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sensing a pressure within a fluid delivery device using a pressure sensor as a therapeutic fluid is added to or removed from a reservoir of the device; estimating a pressure of the reservoir based on the sensed pressure, an estimated initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure, and an estimated temperature of the therapeutic fluid based on the sensed pressure, wherein the estimated pressure of the reservoir is different than the sensed pressure; and determining, by a processor, a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A fluid delivery system comprising:
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an implantable fluid delivery device comprising; a reservoir configured to store a therapeutic fluid; a pressure sensor configured to sense one or more pressures within the fluid delivery device; and a processor configured to sense a pressure within the fluid delivery device using the pressure sensor as a therapeutic fluid is added to or removed from the reservoir, estimate a pressure of the reservoir based on the sensed pressure, an estimated initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure, and an estimated temperature of the therapeutic fluid based on the sensed pressure, wherein the estimated pressure of the reservoir is different than the sensed pressure, and determine a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A non-transitory computer-readable storage medium comprising instructions for causing a programmable processor in an implantable fluid delivery system to:
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receive a pressure within a fluid delivery device from a pressure sensor as a therapeutic fluid is added to or removed from a reservoir of the device; estimate a pressure of the reservoir based on the sensed pressure, an estimated initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure, and an estimated temperature of the therapeutic fluid based on the sensed pressure, wherein the estimated pressure of the reservoir is different than the sensed pressure; and determine a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir.
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38. A system comprising:
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means for sensing a pressure within a fluid delivery device using a pressure sensor as a therapeutic fluid is added to or removed from a reservoir of the device; means for estimating a pressure of the reservoir based on the sensed pressure, an estimated initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure, and an estimated temperature of the therapeutic fluid based on the sensed pressure, wherein the estimated pressure of the reservoir is different than the sensed pressure; and means for determining a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir.
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39. A method comprising:
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sensing a pressure within a fluid delivery device using a pressure sensor as a therapeutic fluid is added to or removed from a reservoir of the device; estimating an initial temperature of the reservoir as the therapeutic fluid is added or removed based on the sensed pressure; estimating a temperature of the therapeutic fluid based on the sensed pressure; determining an estimated pressure of the reservoir based on the estimated initial temperature of the reservoir and the estimated temperature of the therapeutic fluid, wherein the estimated pressure of the reservoir is different than the sensed pressure; and determining, by a processor, a volume of the fluid added to or removed from the reservoir based on the sensed pressure and the estimated pressure of the reservoir.
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Specification