System and method for acquisition of biosignals with motion sensor-based artifact compensation

Patent metadata

Field	Value
Publication number	US-10420511-B2
Application number	US-201615381923-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 22, 2015
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

The disclosure relates to systems and methods for acquisition of biosignals with motion sensor-based artifact compensation. One example embodiment is a system for acquisition of biosignals from a subject. The system includes at least one biosensor worn over a first location of a body part of the subject configured for biosignal measurement and providing a measured biosignal. The system also includes a plurality of inertial motion sensors worn over a plurality of locations of the body part of the subject. Each of the inertial motion sensors is configured for providing a motion vector signal. The system further includes a biosignal adaptation unit configured for receiving and adapting the measured biosignal. In addition, the system includes a motion estimation unit. Further, the system includes a digital filter unit. At least one of the plurality of inertial motion sensors is mechanically connected to the at least one biosensor.

First claim

What is claimed is:

1. A system for acquisition of biosignals from a subject, comprising:
at least one biosensor worn over a first location of a body part of the subject and configured for biosignal measurement and providing a measured biosignal;
a plurality of inertial motion sensors worn over a plurality of locations of the body part of the subject, wherein the plurality of inertial motion sensors is configured for motion vector measurement, and wherein each inertial motion sensor is configured for providing a motion vector signal;
a biosignal adaptation unit configured for receiving the measured biosignal and adapting the measured biosignal into a digital measured biosignal;
a motion estimation unit configured for receiving the motion vector signals from the plurality of inertial motion sensors and calculating a digital reference motion signal; and
a digital filter unit configured for receiving the digital measured biosignal and the digital reference motion signal and performing removal of motion artifacts affecting the digital measured biosignal,
wherein at least one of the plurality of inertial motion sensors is mechanically connected to the at least one biosensor,
wherein the digital reference motion signal comprises a relative motion vector signal indicating relative motion of the at least one biosensor with respect to the first location of the body part of the subject, and
wherein the relative motion vector signal is calculated by:
calculating, with the received motion vector signals, an average motion vector of the body part of the subject; and
performing a vectorial subtraction between (i) the motion vector signal of the inertial motion sensor that is mechanically connected to the at least one biosensor and (ii) the calculated average motion vector.

2. The system according to claim 1 , wherein at least one of the plurality of inertial motion sensors is not mechanically connected to the at least one biosensor.

3. The system according to claim 1 , wherein the received motion vector signals comprise absolute motion vector signals and the average motion vector of the body part of the subject comprises an average absolute motion vector of the body part of the subject.

4. The system according to claim 1 , further comprising:
a second biosensor worn over a second location of the body part of the subject and configured for providing a second measured biosignal; and
a second inertial motion sensor mechanically connected to the second biosensor,
wherein the motion estimation unit is further configured to calculate a second digital reference motion signal,
wherein the second digital reference motion signal comprises a relative motion vector signal indicating relative motion of the second biosensor with respect to the second location of the body part of the subject,
wherein the digital filter unit is further configured for calculating a digital filtered version of the second measured biosignal, and
wherein the digital filtered version of the second measured biosignal has reduced motion artifacts and/or does not have motion artifacts.

5. The system according to claim 1 , wherein the system is a component of an electronic device for acquisition of biosignals from the subject.

6. The system according to claim 1 , wherein the system is a component of a body-wearable item for acquisition of biosignals from the subject.

7. The system according to claim 1 , wherein the plurality of inertial motion sensors comprises an accelerometer, a gyroscope, or a magnetometer.

8. A method for acquisition of biosignals from a subject, comprising:
receiving a measured biosignal from at least one biosensor worn over a first location of a body part of the subject;
receiving a plurality of motion vector signals from a plurality of inertial motion sensors worn over a plurality of locations of the body part of the subject;
calculating a reference motion signal from the received plurality of motion vector signals; and
performing removal of motion artifacts affecting the measured biosignal,
wherein at least one of the plurality of inertial motion sensors is mechanically connected to the at least one biosensor,
wherein the reference motion signal comprises a relative motion vector signal indicating relative motion of the at least one biosensor with respect to the first location of the body part of the subject, and
wherein calculating the relative motion vector signal comprises:
calculating, with the received motion vector signals, an average motion vector of the body part of the subject; and
performing a vectorial subtraction between (i) the motion vector signal of the inertial motion sensor that is mechanically connected to the at least one biosensor and (ii) the calculated average motion vector.

9. The method according to claim 8 , wherein at least one of the plurality of inertial motion sensors is not mechanically connected to the at least one biosensor.

10. The method according to claim 8 , wherein the received plurality of motion vector signals comprise absolute motion vector signals, and wherein the average motion vector of the body part of the subject comprises an average absolute motion vector of the body part of the subject.

11. The method according to claim 8 , further comprising:
receiving a second measured biosignal from a second biosensor worn over a second location of the body part of the subject, wherein a second inertial motion sensor is mechanically connected to the second biosensor;
calculating a second digital reference motion signal, wherein the second digital reference motion signal comprises a relative motion vector signal indicating relative motion of the second biosensor with respect to the second location of the body part of the subject; and
calculating a digital filtered version of the second measured biosignal, wherein the digital filtered version of the second measured biosignal has reduced motion artifacts or does not have motion artifacts.

12. The method according to claim 8 , wherein the plurality of inertial motion sensors comprises an accelerometer, a gyroscope, or a magnetometer.

13. A non-transitory computer-readable storage medium comprising software program instructions stored thereon, wherein the software program instructions are executable by a microprocessor to perform a method for acquisition of biosignals from a subject, comprising:
receiving a measured biosignal from at least one biosensor worn over a first location of a body part of the subject;
receiving a plurality of motion vector signals from a plurality of inertial motion sensors worn over a plurality of locations of the body part of the subject;
calculating a reference motion signal from the received plurality of motion vector signals; and
performing removal of motion artifacts affecting the measured biosignal,
wherein at least one of the plurality of inertial motion sensors is mechanically connected to the at least one biosensor,
wherein the reference motion signal comprises a relative motion vector signal indicating relative motion of the at least one biosensor with respect to the first location of the body part of the subject, and
wherein calculating the relative motion vector signal comprises:
calculating, with the received motion vector signals, an average motion vector of the body part of the subject; and
performing a vectorial subtraction between (i) the motion vector signal of the inertial motion sensor that is mechanically connected to the at least one biosensor and (ii) the calculated average motion vector.

14. The non-transitory computer-readable storage medium according to claim 13 , wherein at least one of t

Assignees

• Imec Vzw

Inventors

• Torfs Tom

Classifications

• A61B5/725

  using specific filters therefor, e.g. Kalman or adaptive filters (specific diagnostics methods using using bioelectric or biomagnetic signals A61B5/316) · CPC title

• A61B5/6802

  Sensor mounted on worn items · CPC title

• G01C21/12

  executed aboard the object being navigated; Dead reckoning · CPC title

• A61B2562/04

  Arrangements of multiple sensors of the same type · CPC title

• A61B5/721 Primary

  using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured · CPC title