Ballistocardiographic sensor system with a sensor arrangement and method of ballistocardiographic detection of body movements

Patent metadata

Field	Value
Publication number	US-9596998-B2
Application number	US-52755908-A
Country	US
Kind code	B2
Filing date	Feb 18, 2008
Priority date	Feb 22, 2007
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

Sensor arrangement, comprising at least one ballistocardiographic sensor for detecting body movements of a subject and at least one noise sensor for detecting vibration, method of ballistocardiographic detection of body movements, ballistocardiographic sensor system and uses of the sensor arrangement. It is suggested to pickup an external noise signal using an inertia sensor that is vibration isolated from a subject under ballistocardiographic examination.

First claim

The invention claimed is:

1. A sensor arrangement, comprising:
at least one ballistocardiographic sensor configured to detect body movements of a subject;
a structure configured to support a body of the subject;
at least one noise sensor configured to detect vibration; and
a mechanical mounting affixed to the structure, the mounting being configured to:
vibrationally isolate the noise sensor from the body,
protrude the noise sensor from the structure to a working position, and
retract the noise sensor to a stowed position.

2. The sensor arrangement according to claim 1 , wherein the ballistocardiographic sensor is arranged at the structure.

3. The sensor arrangement according to claim 1 , wherein the noise sensor is a seismic sensor which is arranged in close proximity to the ballistocardiographic sensor and/or to the structure.

4. The sensor arrangement according to claim 1 , wherein the noise sensor and the ballistocardiographic sensor are arranged such that vibrations which do not result from the body movements of the subject are detected by both the noise sensor and the ballistocardiographic sensor.

5. A ballistocardiographic sensor system comprising:
the sensor arrangement according to claim 1 ; and
a data processor configured to process signals from the noise sensor and the ballistocardiographic sensor.

6. The sensor arrangement according to claim 1 , wherein said sensor arrangement is configured for monitoring one or more of heart rate, respiration rate and activity of a subject.

7. The sensor arrangement according to claim 1 , wherein said sensor arrangement is configured for surveillance of a person in a care environment.

8. The sensor arrangement according to claim 1 , wherein said sensor arrangement is configured for monitoring arrhythmia.

9. The sensor arrangement according to claim 1 , wherein said sensor arrangement is configured for assessing sleep quality.

10. The sensor arrangement according to claim 1 , wherein said sensor arrangement is configured for surveillance of congestive heart failure patients.

11. A sensor arrangement comprising:
at least one ballistocardiographic sensor for detecting body movements of a subject;
a structure supporting a body of the subject, the structure including an undercarriage and a fixing brake;
a mechanical mounting affixed to the structure; and
at least one noise sensor movably attached to the structure via the mechanical mounting for detecting vibration;
wherein the noise sensor is vibrationally isolated from the body, and wherein the mechanical mounting is operationally connected to the brake such that the noise sensor is protruded from the structure upon the fixing brake being applied.

12. A method of ballistocardiographic detection of body movements of a subject, comprising:
detecting a ballistocardiographic signal from the body of the subject with a ballistocardiographic sensor,
with a mounting, mechanically protruding a noise sensor from a structure that supports the body of the subject to a working position and retracting the noise sensor to a deployed position, and
detecting a noise signal by the noise sensor,
wherein the noise sensor is vibrationally isolated from the body of the subject.

13. The method according to claim 12 , wherein the noise signal is used for dejamming the ballistocardiographic signal and/or for an evaluation of the ballistocardiographic signal.

14. The method according to claim 12 , further comprising:
noise cancellation filtering the ballistocardiographic signal.

15. The method according to claim 12 , further comprising:
protruding the noise sensor to the working position in response to applying a brake to fix a position of an undercarriage of the support.

16. The method according to claim 12 , further including:
subtracting a spectrum of the noise signal from a spectrum of the ballistocardiographic signal; and
restoring a dejammed signal.

Assignees

• Muehlsteff Jens
• Brauers Andreas
• Koninklijke Philips Nv

Inventors

• Muehlsteff Jens
• Brauers Andreas

Classifications

• A61B2562/046

  in a matrix array · CPC title

• A61B5/6891

  Furniture · CPC title

• A61B2560/0247

  for compensation or correction of the measured physiological value · CPC title

• A61B5/721

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

• A61B5/6887

  mounted on external non-worn devices, e.g. non-medical devices · CPC title