Continuous analyte monitor with multi-point self-calibration
First Claim
Patent Images
1. An analyte monitor, comprising:
- a plurality of tissue piercing elements each having a distal opening, a proximal opening, and an interior lumen extending between the distal and proximal openings;
a sensing area in fluid communication with the proximal openings of the plurality of tissue piercing elements;
a plurality of calibration fluid reservoirs each adapted to house a calibration fluid, wherein the plurality of calibration fluid reservoirs are in fluid communication with the sensing area; and
a sensor configured to detect an analyte and provide an output indicative of the analyte concentration of a fluid in the sensing area.
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Abstract
Analyte monitors and their methods of use. The analyte monitors include multiple calibration fluids which may have different known concentrations of an analyte, such as glucose. The analyte monitors may also include sensing or washing fluids. The analyte monitors are configured to be calibrated with the multiple calibration fluids to potentially provide a more accurate determination of analyte concentrations. The analyte monitors can be adapted to be self-calibrating with the multiple calibration fluids.
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Citations
50 Claims
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1. An analyte monitor, comprising:
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a plurality of tissue piercing elements each having a distal opening, a proximal opening, and an interior lumen extending between the distal and proximal openings; a sensing area in fluid communication with the proximal openings of the plurality of tissue piercing elements; a plurality of calibration fluid reservoirs each adapted to house a calibration fluid, wherein the plurality of calibration fluid reservoirs are in fluid communication with the sensing area; and a sensor configured to detect an analyte and provide an output indicative of the analyte concentration of a fluid in the sensing area. - 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, 28, 29, 30, 31, 32)
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33. A method of monitoring a concentration of an analyte in a patient'"'"'s interstitial fluid in vivo, the method comprising:
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calibrating an analyte monitor, the analyte monitor comprising; a plurality of tissue piercing elements each having a distal opening, a proximal opening, and an interior lumen extending between the distal and proximal openings; a sensing area in fluid communication with the proximal openings of the plurality of tissue piercing elements; a plurality of calibration fluid reservoirs each adapted to house a calibration fluid, wherein the plurality of calibration fluid reservoirs are in fluid communication with the sensing area; a sensor configured to detect the analyte and provide an output indicative of the analyte concentration of a fluid in the sensing area; at least one waste reservoir in fluid communication with the sensing area configured to receive fluid from the sensing area; and a memory in communication with the sensor; wherein calibrating the analyte monitor comprises; moving a first calibration fluid with a first known analyte concentration from a first calibration reservoir into the sensing area; sensing an analyte concentration in the first calibration fluid while in the sensing area with the analyte sensor, the sensor providing a first output indicative of the analyte concentration of the first calibrating fluid; moving a second calibration fluid with a second known analyte concentration from a second calibration reservoir into the sensing area thereby displacing the first calibration fluid with the second calibration fluid into the at least one waste reservoir; sensing an analyte concentration in the second calibration fluid while in the sensing area with the analyte sensor, the sensor providing a second output indicative of the analyte concentration of the second calibrating fluid; and storing a sensor calibration in the memory, the sensor calibration comprising an association between the first and second known analyte concentrations and the first and second outputs indicative of the first and second known analyte concentrations. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification