Physiological sensor history backfill system and method

• US 9,901,305 B2
• Filed: 06/13/2014
• Issued: 02/27/2018
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Massey, Linda, Collins, Thomas, Lewinski, David, Torres, Linda, Wang, Yongbo
• Primary Examiner(s): Natnithithadha, Navin
• Application Number:
  US14/304,686
• Publication Number:
  US 20150359490A1
• Time in Patent Office: 1,355 Days
• Field of Search: 600309, 600345-366
• 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 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/369 Electroencephalography [EEG] devices for psychotechnics A61B5/16
• CPC Class Codes: A61B 5/4839 combined with drug delivery
• CPC Class Codes: A61B 5/6801 specially adapted to be attached to or worn on the body surface
• CPC Class Codes: A61B 5/6898 Portable consumer electronic devices, e.g. music players, telephones, tablet computers
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts

Abstract

A physiological sensor history backfill system and method including a method of sensor history backfill for a local base device operable to wirelessly communicate with a physiological sensor connected to a patient, the method including: obtaining physiological readings for the patient at a predetermined interval; storing the physiological readings at the physiological sensor as sensor physiological readings; storing the physiological readings at the local base device as historic physiological readings; obtaining a current physiological reading for the patient; transmitting the current physiological reading to the local base device in a current reading message; detecting a record gap in the historic physiological readings between the current physiological reading and the historic physiological readings; and filling the record gap in the historic physiological readings with sensor physiological readings from the physiological sensor when the current reading message does not include the sensor physiological readings to fill the record gap.

Claims

1. A method of sensor history backfill for a local base device operable to wirelessly communicate with a physiological sensor connected to a patient, the method comprising:

obtaining physiological readings for the patient at a predetermined interval;

storing the physiological readings at the physiological sensor as sensor physiological readings;

storing the physiological readings at the local base device as historic physiological readings;

obtaining a current physiological reading for the patient;

transmitting the current physiological reading to the local base device in a current reading message;

detecting a record gap in the historic physiological readings between the current physiological reading and the historic physiological readings; and

filling the record gap in the historic physiological readings with sensor physiological readings from the physiological sensor when the current reading message does not include the sensor physiological readings to fill the record gap,

wherein the filling further comprises;

detecting an End of Day marker that occurred during the record gap, the End of Day marker being stored at the local base device; and

associating the End of Day marker with the historic physiological readings in the record gap at a time of the End of Day marker.

2. The method of claim 1 wherein the local base device is an insulin pump and the physiological sensor is a glucose sensor.

3. The method of claim 1 wherein the local base device includes a local base device clock and the physiological sensor includes a physiological sensor clock, the method further comprising synchronizing the local base device clock and the physiological sensor clock before the transmitting.

4. The method of claim 1 wherein the filling further comprises repeatedly transferring a predetermined packet number of sensor physiological readings from the physiological sensor to the local base device to provide the sensor physiological readings required to filling the record gap.

5. The method of claim 1 wherein the filling further comprises:

detecting a Time Change marker that occurred during the record gap, the Time Change marker being stored at the local base device; and

adjusting a user clock associated with the historic physiological readings in the record gap on and after a time of the Time Change marker by a time change value associated with the Time Change marker.

6. The method of claim 1 wherein the filling further comprises:

detecting a Sensor Off marker that occurred during the record gap, the Sensor Off marker being stored at the local base device; and

assigning a Sensor Off value to the historic physiological readings in the record gap on and after a time of the Sensor Off marker.

7. The method of claim 1 wherein the filling further comprises:

detecting a Sensor On marker that occurred during the record gap, the Sensor On marker being stored at the local base device; and

filling the record gap in the historic physiological readings in the record gap after a time of the Sensor On marker with sensor physiological readings from the physiological sensor.

8. The method of claim 1 wherein the filling further comprises:

assigning a Gap Fill value to the historic physiological readings in the record gap before a fillable start time defined as time of the current physiological reading less a maximum physiological sensor storage time.

9. A physiological sensor system with sensor history backfill for a patient, the system comprising:

a physiological sensor and a local base device operable to wirelessly communicate with the physiological sensor, wherein;

the physiological sensor has a processor and a memory operably coupled to the processor, the memory containing programming code executable by the processor to;

obtain physiological readings for the patient;

store the physiological readings at the physiological sensor as sensor physiological readings;

transmit the physiological readings to the local base device;

obtain a current physiological reading for the patient;

transmit the current physiological reading in a current reading message to the local base device;

receive a request for missing physiological readings;

select sensor physiological readings for the missing physiological readings; and

transmit the selected sensor physiological readings to the local base device;

the local base device has a processing unit and a storage medium operably coupled to the processing unit, the storage medium containing programming code executable by the processing unit to;

receive the physiological readings from the physiological sensor;

store the physiological readings as historic physiological readings;

receive the current physiological reading in the current reading message from the physiological sensor;

detect a record gap in the historic physiological readings between the current physiological reading and the historic physiological readings;

identify the missing physiological readings in the record gap;

transmit the request for the missing physiological readings to the physiological sensor when the current reading message does not include the sensor physiological readings to fill the record gap;

receive the selected sensor physiological readings from the physiological sensor; and

fill the record gap with the selected sensor physiological readings.

10. The system of claim 9 wherein the local base device is an insulin pump and the physiological sensor is a glucose sensor.

11. A method of sensor history backfill for an insulin pump operable to wirelessly communicate with a glucose sensor connected to a patient, the method comprising:

obtaining glucose readings for the patient at a predetermined interval, each of the glucose readings being associated with a glucose reading time;

storing a predetermined storage number of the glucose readings at the glucose sensor with the associated glucose reading time, the predetermined storage number being greater than or equal to one and greater than a predetermined packet number;

measuring a current glucose reading for the patient at a current measurement time;

transmitting from the glucose sensor to the insulin pump a current message including the current glucose reading, the current measurement time, and the predetermined packet number of the glucose readings immediately before the current glucose reading, the predetermined packet number being greater than or equal to zero;

retrieving a last stored glucose reading time from the insulin pump memory;

calculating a time gap between the current measurement time and the last stored glucose reading time;

setting a backfill start time equal to the last stored glucose reading time when the time gap is greater than a packet duration defined as the predetermined interval multiplied by the predetermined packet number;

requesting the glucose sensor to transmit to the insulin pump the predetermined packet number of the glucose readings immediately after the backfill start time;

storing the predetermined packet number of the glucose readings immediately after the backfill start time in the insulin pump;

adding the packet duration to the backfill start time; and

repeating the requesting, the storing, and the adding when a backfill end time defined as the backfill start time less the packet duration is less than the current measurement time.

12. The method of claim 11 wherein the insulin pump includes an insulin pump clock and the glucose sensor includes a glucose sensor clock, the method further comprising synchronizing the insulin pump clock and the glucose sensor clock before the transmitting.

13. The method of claim 11 wherein the filling further comprises:

detecting a Time Change marker that occurred during the time gap, the Time Change marker being stored at the insulin pump; and

adjusting a user clock associated with the glucose readings during the time gap on and after a time of the Time Change marker by a time change value associated with the Time Change marker.

14. The method of claim 11 wherein the filling further comprises:

detecting a Sensor Off marker that occurred during the time gap, the Sensor Off marker being stored at the insulin pump; and

assigning a Sensor Off value to the glucose readings during the time gap on and after a time of the Sensor Off marker.

15. The method of claim 11 wherein the filling further comprises:

detecting a Sensor On marker that occurred during the time gap, the Sensor On marker being stored at the insulin pump; and

filling the time gap in the historic physiological readings after a time of the Sensor On marker with sensor physiological readings from the glucose sensor.

16. The method of claim 11 wherein the filling further comprises:

detecting an End of Day marker that occurred during the time gap, the End of Day marker being stored at the insulin pump; and

associating the End of Day marker with the historic physiological readings at a time of the End of Day marker.

17. The method of claim 11 wherein the filling further comprises:

assigning a Gap Fill value to the glucose readings in the time gap before a fillable start time defined as time of the current glucose reading less a maximum glucose sensor storage time.