Method and System for Providing Analyte Monitoring

Abstract

Methods and apparatuses for determining an analyte value are disclosed.

What is claimed is: 
     
         1 . An analyte monitoring device, comprising:
 an analyte sensor configured to be positioned at least in part in contact with a fluid under a skin layer of a user;   a processor;   a memory, the memory storing instructions which, when executed by the processor, cause the analyte monitoring device to:
 determine a present momentum-based estimate of a signal from the analyte sensor using at least a previous estimate of the signal at a first data rate, a present estimate of the signal at the first data rate, and a previous momentum-based estimate of the signal, the signal corresponding to an analyte level; 
 determine a combined value of the present momentum-based estimate and a present noise-filtered estimate of the signal; 
 determine a dropout compensated signal based on a weighted average of the present momentum-based estimate and the combined value of the present momentum-based estimate and the present noise-filtered estimate; 
 determine an adjusted analyte level using the dropout compensated signal; 
 store the dropout compensated signal and adjusted analyte level; and 
 communicate the adjusted analyte level to a remote device configured to receive the adjusted analyte level and provide an output of the adjusted analyte level to a display. 
   
     
     
         2 . The analyte monitoring device of  claim 1 , wherein the instructions, when executed by the processor, further cause the analyte monitoring device to:
 determine an inertial gain of the signal based at least in part on the previous estimate of the signal at the first data rate and the present estimate of the signal at the first data rate.   
     
     
         3 . The analyte monitoring device of  claim 2 , wherein the instructions, when executed by the processor, further cause the analyte monitoring device to:
 determine a tracking gain of the signal based at least in part on the inertial gain of the signal.   
     
     
         4 . The analyte monitoring device of  claim 3 , wherein the instructions, when executed by the processor, further cause the analyte monitoring device to:
 determine weighting factors for the weighted average of the present momentum-based estimate and the combined value of the present momentum-based estimate and the present noise-filtered estimate based on the inertial gain of the signal and the tracking gain of the signal.   
     
     
         5 . The analyte monitoring device of  claim 1 , wherein the present estimate of the signal at the first data rate is determined based on at least a present estimate of the signal at a second data rate, a previous noise-filtered estimated of the signal, and the present noise-filtered estimate of the signal, wherein the second data rate is more frequent than the first data rate. 
     
     
         6 . The analyte monitoring device of  claim 1 , wherein the instructions, when executed by the processor, further cause the analyte monitoring device to:
 apply one or more clipping limits to the dropout compensated signal prior to determining the adjusted analyte level, wherein the one or more clipping limits correspond to threshold values for the dropout compensated signal.   
     
     
         7 . The analyte monitoring device of  claim 1 , wherein the instructions, when executed by the processor, further cause the analyte monitoring device to:
 apply a plurality of clipping limits to the dropout compensated signal prior to determining the adjusted analyte level, wherein the clipping limits correspond to the present noise-filtered estimate and a multiple of the present noise-filtered estimate.   
     
     
         8 . The analyte monitoring device of  claim 1 , wherein the instructions causing the analyte monitoring device to determine the dropout compensated signal further cause the analyte monitoring device to:
 determine an occurrence of a signal dropout in signals received from the analyte sensor;   determine whether a preset time period has elapsed between a previous occurrence of a signal dropout and the occurrence of the signal dropout;   if the preset time period has elapsed, select as the dropout compensated signal a first dropout compensated signal corresponding to the occurrence of the signal dropout based on the noise-filtered signal; and   if the preset time period has not elapsed, select as the dropout compensated signal a second dropout compensated signal corresponding to the occurrence of the signal dropout based on a transition using a previous dropout compensated signal and the noise filtered signal.   
     
     
         9 . The analyte monitoring device of  claim 1 , wherein the adjusted analyte level comprises a glucose level. 
     
     
         10 . The analyte monitoring device of  claim 1 , wherein the adjusted analyte level comprises a lactate level. 
     
     
         11 . The analyte monitoring device of  claim 1 , wherein the remote device includes a remote server. 
     
     
         12 . The analyte monitoring device of  claim 1 , wherein the remote device is a handheld receiver unit. 
     
     
         13 . The analyte monitoring device of  claim 1 , wherein the combined value of the present momentum-based estimate and a present noise-filtered estimate of the signal is an averaged value of the present momentum-based estimate and a present noise-filtered estimate of the signal. 
     
     
         14 . The analyte monitoring device of  claim 1 , wherein the present momentum-based estimate comprises an estimate of the signal without dropouts and including a projection for the signal using at least one past value. 
     
     
         15 . The analyte monitoring device of  claim 14 , wherein the projection for the signal is based at least in part on a prior trend associated with the signal. 
     
     
         16 . The analyte monitoring device of  claim 14 , wherein the present momentum-based estimate is based at least in part on a likelihood of the projection for the signal being accurate. 
     
     
         17 . An analyte monitoring system, comprising:
 an analyte sensor configured to generate signals corresponding to an analyte level when the analyte sensor is positioned at least in part in contact with a fluid under a skin layer of a user;   a remote device configured to receive an adjusted analyte level and provide an output of the adjusted analyte level to a display; and   an analyte monitoring device, wherein the analyte monitoring device comprises one or more processors and a memory, the memory storing instructions which, when executed by the processor, cause the analyte monitoring device to:
 determine a present momentum-based estimate of a signal from the analyte sensor using at least a previous estimate of the signal at a first data rate, a present estimate of the signal at the first data rate, and a previous momentum-based estimate of the signal, the signal corresponding to an analyte level; 
 determine a combined value of the present momentum-based estimate and a present noise-filtered estimate of the signal; 
 determine a dropout compensated signal based on a weighted average of the present momentum-based estimate and the combined value of the present momentum-based estimate and the present noise-filtered estimate; 
 determine an adjusted analyte level using the dropout compensated signal; 
 store the dropout compensated signal and adjusted analyte level; and 
 communicate the adjusted analyte level to the remote device. 
   
     
     
         18 . The analyte monitoring system of  claim 15 , wherein the remote device is further configured to use signals from the analyte sensor to separately determine the dropout compensated signal and the adjusted analyte level. 
     
     
         19 . The analyte monitoring system of  claim 15 , wherein the analyte sensor comprises a glucose sensor. 
     
     
         20 . The analyte monitoring system of  claim 15 , wherein the analyte sensor comprises a lactate sensor. 
     
     
         21 . The analyte monitoring system of  claim 15 , wherein the remote device includes a remote server. 
     
     
         22 . The analyte monitoring system of  claim 15 , wherein the remote device is a handheld receiver unit.