ADVANCED CONTINUOUS ANALYTE MONITORING SYSTEM

• US 20120078071A1
• Filed: 09/28/2011
• Published: 03/29/2012
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: DexCom Incorporated
• Original Assignee: DexCom Incorporated
• Inventors: Bohm, Sebastian, Johnson, Eric, Kamath, Apurv Ullas, Larvenz, Shawn, Leach, Jacob S., Mahalingam, Aarthi, Neale, Paul V., Pryor, Jack, Peyser, Thomas A., Rong, Daiting, Shariati, Mohammad Ali, Simpson, Peter C., Wightlin, Matthew, Dervaes, Mark, Lieu, Phong, Miller, Tom, San Vicente, Kenneth
• Granted Patent: US 10,231,653 B2
• Time in Patent Office: Days
• US Class Current: 600/345
• CPC Class Codes: A61B 2560/0209 adapted for power saving
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• CPC Class Codes: A61B 2562/02 Details of sensors specially adapted for in-vivo measurements
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/14503 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors A61B5/1459, A61B5/1464, A61B5/1473, A61B5/1482, A61B5/14865 take precedence
• CPC Class Codes: A61B 5/14507 specially adapted for measuring characteristics of body fluids other than blood devices for taking samples of body liquids A61B10/0045
• CPC Class Codes: A61B 5/1451 for interstitial fluid
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1468 using chemical or electrochemical methods, e.g. by polarographic means A61B5/1486 takes precedence
• CPC Class Codes: A61B 5/14865 invasive, e.g. introduced into the body by a catheter or needle or using implanted sensors
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: G08C 17/02 using a radio link

Abstract

Systems and methods for processing, transmitting, and displaying data received from a continuous analyte (e.g., glucose) sensor are provided. A sensor system can comprise a sensor electronics module that includes power saving features, e.g., a low power measurement circuit that can be switched between a measurement mode and a low power mode, wherein charging circuitry continues to apply power to electrodes of a sensor during the low power mode. The sensor electronics module can be switched between a low power storage mode and a higher power operational mode via a switch, e.g., a reed switch or optical switch. A validation routine can be implemented to ensure an interrupt signal sent from the switch is valid. The sensor can be physically connected to the sensor electronics module in direct wireless communication with a plurality of different display devices.

Claims

1. A system for continuous measurement of an analyte in a host, the system comprising:

a continuous analyte sensor; and

a sensor electronics module coupled to the sensor, the sensor electronics module comprising measurement circuitry, power circuitry, and charging circuitry,

wherein the sensor electronics module is configured to switch between a first mode and a second mode,

wherein in the first mode the power circuitry is coupled to the measurement circuitry and the charging circuitry, the measurement circuitry is coupled to the continuous analyte sensor, and the charging circuitry is decoupled from the continuous analyte sensor, and

wherein in the second mode the power circuitry is decoupled from the measurement circuitry and the charging circuitry, the measurement circuitry is decoupled from the continuous analyte sensor, and the charging circuitry is coupled to the continuous analyte sensor.

4. The system of claim 1, further comprising a second sensor,

wherein in the first mode the measurement circuitry is coupled to the second sensor and the charging circuitry is decoupled from the second sensor, and

wherein in the second mode the measurement circuitry is decoupled from the second sensor and the charging circuitry is coupled to the second sensor.

2. The system of claim 2, wherein the sensor comprises a plurality of electrodes.

3. The system of claim 3, wherein the measurement circuitry applies a voltage across the electrodes of the sensor during the first mode and the charging circuitry applies a voltage across the electrodes of the sensor during the second mode.

5. A method for switching between a measurement mode and a low power mode in a continuous analyte sensor, the method comprising:

enabling power to measurement circuitry and charging circuitry;

switching a reference capacitor to the charging circuit and the measurement circuitry to electrodes of a continuous analyte sensor;

measuring an analyte concentration of a host using the continuous glucose sensor using the measurement circuitry;

disabling power to the measurement circuitry and the charging circuitry; and

switching the reference capacitor to the electrodes.

6. A system for continuous measurement of an analyte in a host, the system comprising:

a continuous analyte sensor; and

a sensor electronics module coupled to the continuous analyte sensor, the sensor electronics module comprising a switch configured to switch the sensor electronics module between a first low power mode and a second higher power mode.

7. The system of claim 6, wherein the switch is a reed switch.

8. The system of claim 6, wherein the switch is an optical switch.

9. The system of claim 6, wherein the switch is activated upon detection of movement of contacts of the sensor electronics module.

10. The system of claim 6, wherein the switch is configured to send an interrupt signal to a processor module of the electronics module to switch from the first mode to the second mode, and wherein the interrupt signal has a predetermined waveform.

11. The system of claim 10, wherein the processor module comprises a core processor and a statemachine, wherein the statemachine is configured to determine whether an interrupt waveform is valid.

12. The system of claim 6, further comprising a mounting unit configured to hold a portion of the continuous analyte sensor, wherein the electronics module is configured to couple to the mounting unit, wherein the switch comprises split connectors configured to couple to the continuous analyte sensor when the electronics module is coupled to the mounting unit, and wherein the switch is configured to switch the sensor electronics module from the first mode to the second mode when the split connectors are coupled to the sensor.

13. The system of claim 12, wherein the split connectors are configured to couple to the sensor via contact pucks of the mounting unit when the electronics module is coupled to the mounting unit.

14. The system of claim 6, further comprising a plurality of sensor electronics modules, wherein each of the sensor electronics modules is configured to be switched between a first low power mode and a second higher power mode.

15. The system of claim 6, wherein the sensor electronics module comprises a wireless receiver, and wherein the sensor electronics module is configured to be placed into the low power mode by receiving a predetermined signal via the wireless receiver.

16. The system of claim 6, wherein the switch is configured to switch from the first low power mode to the second higher power mode when the sensor electronics module detects a signal output of the sensor above a predetermined threshold.

17. A method for placing a sensor electronics module in a storage mode, the sensor electronics module comprising electronics configured to process and to transmit data from a continuous analyte sensor, the method comprising:

receiving a predetermined storage mode command from an external telemetry device via a telemetry module of a sensor electronics module;

initiating a storage mode using the sensor electronics module in response to receiving the predetermined storage mode command, wherein initiating the storage mode comprises initiating a routine to power down electronic components of the sensor electronics module;

placing a switch of the sensor electronics module in a first state;

monitoring, using circuitry of the sensor electronics module, for an interrupt signal from the switch;

placing the switch in a second state;

sending an interrupt signal in response to placing the switch in the second state;

initiating a validation routine in response to receipt of the interrupt signal; and

deactivating the storage mode if the validation routine indicates that the interrupt signal is valid, wherein deactivating the storage mode comprises initiating a routine to power up the electronic components of the sensor electronics module.

18. The method of claim 17, wherein the method is performed repeatedly.

19. The method of claim 17, wherein the switch is a reed switch, wherein placing the switch in the first state comprises placing a magnet in a proximity to the reed switch, and wherein placing the switch in the second state comprises removing the magnet from a proximity to the reed switch.

20. The method of claim 17, wherein the switch is an optical switch, and wherein placing the switch in the second state comprises removing a protective cover over the optical switch.

21. The method of claim 17, wherein the sensor electronics module is configured to not re-enter the storage mode after the sensor electronics module has been taken out of the storage mode.

22. The method of claim 17, wherein the storage mode command has a predetermined waveform.

23. The method of claim 17, wherein the interrupt signal has a predetermined waveform.

24. The method of claim 17, wherein the validation routine is performed using electronic circuitry that is separate from a processor of the sensor electronics module.

25. The method of claim 17, wherein the validation routine performs a plurality of iterative tests to determine if the interrupt signal is valid, wherein if one of the iterative tests fails, then no further iterative tests are performed on the interrupt signal and the validation routine is ended.