Systems and methods for processing and transmitting sensor data

• US 8,844,007 B2
• Filed: 04/06/2012
• Issued: 09/23/2014
• Est. Priority Date: 04/08/2011
• Status: Active Grant

• Current Assignee: DexCom Incorporated
• Original Assignee: DexCom Incorporated
• Inventors: Vicente, Kenneth San, Gauba, Indrawati, Waichal, Siddharth, Walker, Andrew
• Primary Examiner(s): Traore, Fatoumata
• Application Number:
  US13/441,621
• Publication Number:
  US 20120260323A1
• Time in Patent Office: 900 Days
• Field of Search: None
• US Class Current: 726/6
• CPC Class Codes: A61B 2560/0238 Means for recording calibration data
• CPC Class Codes: A61B 2562/08 Sensors provided with means for identification, e.g. barcodes or memory chips
• CPC Class Codes: A61B 5/0004 characterised by the type of physiological signal transmitted
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: G16H 10/40 for data related to laboratory analysis, e.g. patient specimen analysis
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04W 12/041 Key generation or derivation
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

Systems and methods for continuous measurement of an analyte in a host are provided. The system generally includes a continuous analyte sensor configured to continuously measure a concentration of analyte in a host and a sensor electronics module physically connected to the continuous analyte sensor during sensor use, wherein the sensor electronics module is further configured to directly wirelessly communicate sensor information to one or more display devices. Establishment of communication between devices can involve using a unique identifier associated with the sensor electronics module to authenticate communication. Times tracked at the sensor electronics module and the display module can be at different resolutions, and the different resolutions can be translated to facilitate communication. In addition, the frequency of establishing communication channels between the sensor electronics module and the display devices can vary depending upon whether reference calibration information is being updated.

Claims

1. A method for wirelessly exchanging glucose information between a first communication device associated with a continuous glucose sensor and a second communication device associated with a glucose information display device, the method comprising:

receiving user input, using a user interface of the second communication device, comprising an identifier associated with the first communication device; and

generating and storing, using the second communication device, a second device ID based at least partially on the identifier;

transmitting a first beacon using the first communication device, the first beacon comprising a first device ID;

receiving the first beacon using the second communication device;

determining, using the second communication device, if the first device ID transmitted by the first communication device matches the second device ID stored at the second communication device;

executing an authentication protocol based on the second communication device determining that the first device ID matches the second device ID; and

exchanging glucose information between the first communication device and the second communication device upon successful completion of the authentication protocol,

wherein the authentication protocol includes

generating, using the second communication device, a first authentication key using a hash function applied to a challenge value provided by the first communication device and the identifier associated with the first communication device,

transmitting, using the second communication device, a message having the first authentication key,

receiving, using the first communication device, the message,

generating, using the first communication device, a second authentication key based on the first challenge value, and

determining, using the first communication device, if the first authentication key matches the second authentication key.

2. The method of claim 1, wherein the identifier comprises a series of alphanumeric characters affixed to a housing of the first communication device and wherein the identifier is at least a portion of a manufacturer serial number associated with the first communication device.

3. The method of claim 1, wherein generating the second authentication key is further based on a security code stored at the first communication device.

4. The method of claim 1, further comprising establishing a communication channel between the first communication device and the second communication device if the first authentication key matches the second authentication key.

5. The method of claim 4, wherein the first communication device and the second communication device are configured to re-establish the communication channel at a predetermined time interval.

6. The method of claim 4, further comprising closing the communication channel after a predetermined amount after transmitting the first beacon and transmitting, using the first communication device, a second beacon comprising the device ID and different challenge value after a predetermined amount of time since the transmission of the first beacon.

7. The method of claim 1, wherein the message transmitted using the second communication device further includes a request for glucose information, and wherein the first communication device transmits the requested glucose information if the first authentication key matches the second authentication key.

8. A method for wirelessly exchanging glucose information between a first communication device associated with a continuous glucose sensor and a second communication device associated with a glucose information display device, the method comprising:

transmitting a first beacon using the first communication device, the first beacon comprising a first device ID;

receiving the first beacon using the second communication device;

determining, using the second communication device, if the first device ID transmitted by the first communication device matches the second device ID stored at the second communication device;

executing an authentication protocol between the first communication device and the second communication device if the first device ID matches the second device ID, wherein the authentication protocol includes generating, using the second communication device, a first authentication key using a hash function applied to a challenge value provided by the first communication device and an identifier associated with the first communication device; and

exchanging glucose information between the first communication device and the second communication device upon successful completion of the authentication protocol,

wherein the first communication device is a sensor system comprising a reusable sensor electronics module and the continuous glucose sensor, wherein the sensor electronics module comprises a processor and a transceiver, and wherein sensor system places the transceiver in a sleep mode after a predetermined amount of time since opening a transmission window and places the transceiver in an operational mode after a predetermined amount of time since placing the transceiver in the sleep mode.

9. A system for wirelessly exchanging glucose information between a first communication device associated with a continuous glucose sensor and a second communication device associated with a glucose information display device, the system comprising:

a sensor electronics module operatively coupled to a continuous glucose sensor, the sensor electronics module configured to wirelessly transmit a first beacon comprising a first device ID; and

a display device comprising a display electronics module and a user interface, the user interface comprising an input module configured to receive user input and the display device configured to display glucose information,

wherein the user interface of the display device is configured to accept user input representative of an identifier associated with the sensor electronics module,

wherein the display electronics module is configured to generate and store a second device ID at least partially based on the identifier, wirelessly receive the first beacon, and determine if the first device ID transmitted by the first communication device matches the second device ID stored at the display device,

wherein the system executes an authentication protocol based on the display device determining that the first device ID matches the second device ID, the authentication protocol including

the display device generating a first authentication key based on a challenge value provided by the sensor electronics module and a sensor electronics ID inputted by a user into the display device, wherein generating the authentication key comprises applying a hash algorithm using the challenge value and the sensor electronics ID, transmitting a message having the first authentication key, and

the sensor electronics receiving the message, generating a second authentication key based on the challenge value and a sensor electronics ID stored in the sensor electronics module during manufacturing, and determining if the first authentication key matches the second authentication key, and

wherein the sensor electronics module and the display device exchange data configured to exchange glucose information upon successful completion of the authentication protocol.

10. The system of claim 9, wherein the sensor electronics ID inputted by the user comprises a series of alphanumeric characters affixed to a housing of the sensor electronics module.

11. The system of claim 9, wherein generating the second authentication key is further based on a security code stored at the sensor electronics module.

12. The system of claim 9, wherein the system is configured to establish a communication channel between the sensor electronics module and the display device if the first authentication key matches the second authentication key.

13. The system of claim 12, wherein the sensor electronics module and the display device are configured to re-establish the communication channel at a predetermined time interval.

14. The system of claim 12, wherein the system is further configured to close the communication channel after a predetermined amount since transmission of the first beacon, and wherein the sensor electronics module is configured to transmit a second beacon comprising the device ID and different challenge value after a predetermined amount of time since the transmission of the first beacon.

15. A system for wirelessly exchanging glucose information between devices of a continuous glucose monitoring system, the system comprising:

a sensor electronics module operatively coupled to a continuous glucose sensor, the sensor electronics module configured to generate, process and transmit glucose data indicative of a host'"'"'s glucose concentration measured by the glucose sensor; and

a display device configured to wirelessly communicate with the sensor electronics module, the display device comprising a display electronics module and a user interface, the user interface comprising an input module configured to receive user input and a display configured to display glucose information,

wherein the sensor electronics module is configured to wirelessly transmit a first beacon comprising a first device ID,

wherein the display electronics module is configured to wirelessly receive the first beacon, determine if the first device ID transmitted by the first communication device matches a second device ID stored at the display device, and execute an authentication protocol if the second communication device determines that the first device ID matches the second device ID,

wherein the authentication protocol includes the display device generating a first authentication key based on a challenge value provided by the sensor electronics module and a sensor electronics ID inputted by a user into the display device, and applying a hash algorithm using the challenge value and the sensor electronics ID, and

wherein the sensor electronics module is reusable with multiple continuous glucose sensors, wherein the sensor electronics module comprises a processor and a transceiver, and wherein sensor electronics module is configured to place the transceiver in a sleep mode after a predetermined amount of time since opening a transmission window and place the transceiver in an operational mode after a predetermined amount of time since placing the transceiver in the sleep mode.