Body worn sensors network with redundant parameter prioritization and temporal alignment

• US 10,264,968 B2
• Filed: 09/21/2011
• Issued: 04/23/2019
• Est. Priority Date: 09/30/2010
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Gross, Brian David
• Primary Examiner(s): Layno, Carl H
• Assistant Examiner(s): Xie, Dacheng
• Application Number:
  US13/825,978
• Publication Number:
  US 20130237775A1
• Time in Patent Office: 2,771 Days
• Field of Search: 600300-301
• 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 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

Each sensor of a plurality of sensors operates independently to perform at least a monitoring function acquiring sensor data indicative of a common physiological parameter and a grading function performed occasionally to assign a current signal quality grade for the sensor that is indicative of operational status of the monitoring function of the sensor. A data structure stores information pertaining to the plurality of sensors including at least priorities of the plurality of sensors respective to the common physiological parameter and the current signal quality grades for the sensors. Each sensor further operates to perform at least one output function generating an output signal conditional upon content of the data structure including at least the priorities and the current signal quality grades of the sensors indicating the output function should be performed.

Claims

1. A system comprising:

a plurality of sensors, each sensor of the plurality of sensors operating independently of the other sensor or sensors of the plurality of sensors, each of the sensors including a data structure configured to store information related to the corresponding sensor, a transceiver configured to send and receive data from the other sensors of the plurality of sensors, a processor; and

a memory configured to store machine-executable instructions, wherein execution of the instructions causes each sensor to perform at least;

a monitoring function acquiring sensor data indicative of a common physiological parameter, and

a grading function performed occasionally at a predetermined time pattern to assign a current grade for the sensor wherein the current grade is indicative of operational status of the monitoring function of the sensor; and

wherein the data structure stores information pertaining to the plurality of sensors including at least priorities of the plurality of sensors respective to the common physiological parameter and the current grades for the sensors of the plurality of sensors, the priorities including (i) robustness versus interferences of the plurality of sensors respective to the common physiological parameter and (ii) the current grades for the sensors of the plurality of sensors;

wherein execution of the instructions further causes each sensor of the plurality of sensors to perform at least one output function generating an output signal conditional upon content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors indicating the output function should be performed.

2. The system as set forth in claim 1, wherein execution of the instructions stored in the memory of each of the sensors causes each sensor to perform an alarm function that outputs an alarm responsive to an alarm condition dependent on at least:

sensor data acquired by the monitoring function of the sensor indicating an abnormal value for the common physiological parameter, and

content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors

wherein the alarm is audibly with an audible alarm or visually output with a flashing light.

3. The system as set forth in claim 1, wherein execution of the instructions stored in the memory each of the sensors causes each sensor to acquire a latency time;

wherein the data structure further stores the acquired latency time for each sensor, and execution of the instructions stored in the memory of each of the sensors causes the sensor to perform a beacon function performed conditional upon the sensor being the selected output sensor wherein the beacon function outputs a beacon signal to the other sensor or sensors of the plurality of sensors indicating a synchronization time;

wherein execution of the instructions stored in the memory each of the sensors causes each sensor of the plurality of sensors to perform a sync function performed conditional upon the sensor not being the selected output sensor that shifts a time base of sensor data acquired by the monitoring function of the sensor based on the synchronization time and the latency times of the sensor and the selected output sensor.

4. The system as set forth in claim 1, further comprising:

a medical monitor including a data structure configured to store information related to the medical monitor, a transceiver configured to send and receive data from the sensors of the plurality of sensors, a processor; and

a memory configured to store machine-executable instructions;

wherein execution of the instructions stored in the memory of the medical monitor further causes the medical monitor to perform a coordination function selecting an output sensor from the plurality of sensors based on content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors;

wherein the at least one output function of each sensor of the plurality of sensors is not performed if the sensor is not selected as the output sensor.

5. The system as set forth in claim 4, wherein the execution of the instructions stored in the memory of the medical monitor causes the transceiver of the medical monitor to convey the selection of the output sensor to the transceivers of each sensor of the plurality of sensors.

6. The system as set forth in claim 4, wherein execution of the instructions stored in the memory of the medical monitor further causes the medical monitor to perform a reporting function in which the transceiver of the medical monitor receives sensor data acquired by the monitoring function of the sensor from the corresponding transceivers of the sensors, the reporting function being different from the at least one output function.

7. The system as set forth in claim 1, wherein the execution of the instructions stored in the memory each of the sensors causes the plurality of sensors to perform a coordination function a coordination function selecting an output sensor from the plurality of sensors based on content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors by operations including:

controlling the corresponding wireless transceiver to transmit the current grade for the sensor to the other transceivers of the other sensors of the plurality of sensors,

controlling the corresponding wireless transceiver to receive the current grade from the corresponding transceivers for each other sensor of the plurality of sensors,

constructing an instance of the data structure at the sensor, and

selecting an output sensor from the plurality of sensors based on content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors.

8. The system as set forth in claim 7, the wireless transceivers of each the sensors of the plurality of sensors are in communication with each other via a hospital network and at least one access point.

9. The system as set forth in claim 7, wherein execution of the instructions stored in the memory of each of the sensors causes each sensor to perform a reporting function in which each sensor conveys sensor data acquired by the monitoring function of the sensor to the other sensors of the plurality of sensors, the reporting function being different from the at least one output function, the reporting function being performed each sensor regardless of whether or not the sensor is the output sensor.

10. An apparatus comprising:

a sensor including a data structure configured to store information related to the sensor, a transceiver configured to send and receive data from other devices, a processor; and

a memory configured to store machine-executable instructions, wherein execution of the instructions causes the sensor to perform;

a monitoring function acquiring sensor data indicative of a common physiological parameter,

a grading function assigning a current grade for the sensor that is indicative of operational status of the monitoring function of the sensor; and

a reporting function conveying the current grade to at least one device other than the sensor, and

wherein the data structure stores information pertaining to the sensor including at least priorities reflecting an expected;

(i) robustness versus interferences of the sensor respective to the common physiological parameter and (ii) the current grade for the sensor;

wherein execution of the instructions stored in the memory of the sensor causes the sensor to perform a beaconing function outputting a beacon signal indicating a synchronization time, the beaconing function being performed only if information received from the second sensor indicates that the sensor is currently providing reliable information pertaining to the common physiological parameter having a highest quality relative to the quality of the information of the second sensor.

11. The apparatus of claim 10, wherein the common physiological parameter is selected from a group consisting of:

heart rate;

respiration;

breathing rate;

blood oxygenation; and

core body temperature.

12. The apparatus of claim 10 wherein the sensor is one sensor of a plurality of sensors, each sensor of the plurality of sensors including a data structure configured to store information related to the corresponding sensor, a transceiver configured to send and receive data from the other sensors, a processor;

and a memory configured to store machine-executable instructions, wherein execution of the instructions causes the sensors to each perform the monitoring function and the grading function;

wherein the data structure of each sensor stores information pertaining to the corresponding sensor including at least priorities of an expected;

(i) accuracy and robustness versus interferences of the plurality of sensors respective to the common physiological parameter and (ii) the current grades for the sensors of the plurality of sensors;

wherein execution of the instructions stored in the memory of each sensor causes each sensor of the plurality of sensors to perform at least one output function generating an output signal conditional upon content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors indicating the output function should be performed.

13. The apparatus as set forth in claim 12, wherein execution of the instructions stored in the memory of each sensor causes each sensor to independently perform an instance of a coordination function that selects an output sensor from the plurality of sensors, the coordination function including:

controlling the corresponding wireless transceiver to transmit the current grade for the sensor to the other transceivers of the sensors of the plurality of sensors,

controlling the corresponding wireless transceiver to receive the current grade for each other sensor of the plurality of sensors,

constructing an instance of the data structure at each sensor, and

selecting an output sensor from the plurality of sensors based on content of the data structure including at least the priorities and the current grades of the sensors of the plurality of sensors.

14. The apparatus of claim 10, wherein execution of the instructions stored in the memory of the sensor causes the sensor is to perform an alarm function outputting an alarm responsive to an alarm condition wherein the alarm condition requires that at least the following conditions are met:

(i) sensor data acquired by the monitoring function of the sensor indicates an abnormal value for the common physiological parameter, and

(ii) information received from a second sensor that indicates that no sensor is showing a normal reading for the common physiological parameter;

wherein the alarm is audibly with an audible alarm or visually output with a flashing light.

15. The apparatus of claim 14, wherein execution of the instructions stored in the memory of the sensor causes the sensor perform an instance of a coordination function including receiving the current grade or current grades for the second sensor, and condition (ii) comprises:

(ii) the current grade or current grades for the second sensor together with the current grade for the sensor and a prioritization of the sensor and the second sensor indicates that the sensor is currently providing the most information pertaining to the common physiological parameter having a highest quality relative to the quality of the information of the second sensor.

16. An apparatus comprising:

a plurality of sensors, each sensor of the plurality of sensors operating independently of the other sensor or sensors of the plurality of sensors, each of the sensors including a data structure configured to store information related to the corresponding sensor, a transceiver configured to send and receive data from the other sensors of the plurality of sensors, a processor; and

a memory configured to store machine-executable instructions, wherein execution of the instructions causes each sensor to perform at least;

acquiring sensor data indicative of a common physiological parameter, and

occasionally assigning a current grade for the sensor at a predetermined time pattern wherein the current grade is indicative of operational status of the monitoring function of the sensor; and

wherein each data structure stores information pertaining to the corresponding sensor including at least priorities reflecting an expected robustness versus interferences of the plurality of sensors respective to the common physiological parameter and the current grades for the sensors of the plurality of sensors;

execution of the instructions stored in the memory of each sensors causes each sensor of the plurality of sensors to perform independently perform an instance of outputting at least one of;

(1) an alarm responsive to an alarm condition wherein the alarm condition requires that at least the following conditions are met;

(i) sensor data acquired by the monitoring function of a selected sensor indicates an abnormal value for the common physiological parameter, and

(ii) information received from a medical monitor in wireless communication via one or more access points with the selected sensor, the received information indicating that no sensor is showing a normal reading for the common physiological parameter; and

(2) a beacon signal indicating a synchronization time, the beaconing function being performed only if information received from the medical monitor indicates that the corresponding sensor is currently providing the information pertaining to the common physiological parameter having a highest quality relative to the quality of the information of the other sensors;

wherein the alarm is audibly with an audible alarm or visually output with a flashing light;

wherein execution of the instructions stored in the memory of the sensor causes the sensor to perform a beaconing function outputting a beacon signal indicating a synchronization time, the beaconing function being performed only if information received from the second sensor indicates that the sensor is currently providing reliable information pertaining to the common physiological parameter having a highest quality relative to the quality of the information of the second sensor.

17. The apparatus of claim 16, wherein at least one of:

the condition (ii) comprises (ii) information received from the medical monitor indicates that the selected sensor is selected as an output sensor; and

wherein execution of the instructions stored in the memory of the selected sensor causes the selected sensor to perform an instance of a coordination function including receiving the current grade or current grades for the at least one sensor other than the selected sensor, and condition (ii) comprises (ii) the current grade or current grades for the at least one sensor other than the selected sensor together with the current grade for the selected sensor and a prioritization of the selected sensor and the at least one sensor other than the selected sensor indicates that the selected sensor is currently providing the most reliable information pertaining to the common physiological parameter.