Measurement method for detecting vital parameters in a human or animal body, and measuring apparatus

• US 20150374257A1
• Filed: 03/26/2015
• Published: 12/31/2015
• Est. Priority Date: 03/28/2014
• Status: Abandoned Application

• Current Assignee: Lefetaix GmbH
• Original Assignee: Lifetaix GmbH
• Inventors: LEONHARDT, Steffen, WALTER, Marian, TEICHMANN, Daniel, FOUSSIER, Jerome, WARTZEK, Tobias
• Application Number:
  US14/670,100
• Publication Number:
  US 20150374257A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 5/02055 Simultaneously evaluating both cardiovascular condition and temperature
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24
• CPC Class Codes: A61B 5/0522 Magnetic induction tomography
• CPC Class Codes: A61B 5/08 Detecting, measuring or recording devices for evaluating the respiratory organs A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/6891 Furniture
• CPC Class Codes: A61B 5/6893 Cars
• CPC Class Codes: A61B 5/7235 Details of waveform analysis A61B5/349 takes precedence
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence

Abstract

A measurement method (1) for detecting vital parameters in a human or animal body, in which, in a detection step (3), a magnetic induction sensor detects an induction measurement sequence which is dependent on a time-varying change in at least one vital parameter, wherein in the detection step (3), a secondary sensor unit simultaneously detects a secondary measurement sequence, the secondary measurement sequence being dependent on an influential variable signal sequence that influences the induction measurement sequence, and in that in a subsequent combination step (4), at least one vital parameter measurement sequence for a vital parameter detected from the induction measurement sequence is calculated from the induction measurement sequence and the secondary measurement sequence using a predefined combination function, so that the detection accuracy of the vital parameter represented in the vital parameter measurement sequence and the induction measurement sequence is improved by combining the induction measurement sequence with the secondary measurement sequence to form the vital parameter measurement sequence. The invention also relates to a measuring apparatus for carrying out the method according to the invention.

Claims

1. A measurement method (1) for detecting vital parameters in a human or animal body, in which, in a detection step (3), a magnetic induction sensor (7) detects an induction measurement sequence (19, 24, 29) which is dependent on a time-varying change in at least one vital parameter, characterized in that in the detection step (3), a secondary sensor unit (10) simultaneously obtains a secondary measurement sequence (20, 23, 28, 30), the secondary measurement sequence (20, 23, 28, 30) being dependent on an influential variable signal sequence that influences the induction measurement sequence (19, 24, 29), and in that in a subsequent combination step (4), a predefined combination function is used to calculate at least one vital parameter measurement sequence (21, 26, 31, 32) for a vital parameter detected by the induction measurement sequence (19, 24, 29) from the induction measurement sequence (19, 24, 29) and the secondary measurement sequence (20, 23, 28, 30), thereby improving the accuracy of detection of the vital parameter represented in the vital parameter measurement sequence (21, 26, 31, 32) and the induction measurement sequence (19, 24, 29) by combining the induction measurement sequence (19, 24, 29) with the secondary measurement sequence (20, 23, 28, 30) to form the vital parameter measurement sequence (21, 26, 31, 32).

2. The measurement method (1) according to claim 1, characterized in that the combination function is established in a calibration step (2) prior to the detection step (3).

3. The measurement method (1) according to claim 1, characterized in that in the calibration step (2), parameters of the combination function are established.

4. The measurement method (1) according to claim 1, characterized in that, in an extraction step (5) that follows the combination step (4), the vital parameters are determined from the vital parameter measurement sequence (21, 26, 31, 32).

5. The measurement method (1) according to claim 1, characterized in that the secondary measurement sequence (20, 23, 28, 30) is dependent on at least one additional time-varying vital parameter.

6. The measurement method (1) according to claim 5, characterized in that the time-varying vital parameter detected from the secondary measurement sequence (20, 23, 28, 30) is the influential variable component of the induction measurement sequence (19, 24, 29).

7. The measurement method (1) according to claim 1, characterized in that, in the combination step (4), the induction measurement sequence (19, 24, 29) and the secondary measurement sequence (20, 23, 28, 30) are combined by means of a compensation method (18) to form the vital parameter measurement sequence (21, 26, 31, 32), in order to offset an undesirable influential variable component in the induction measurement sequence (19, 24, 29).

8. The measurement method (1) according to claim 1, characterized in that, in the combination step (4), the induction measurement sequence (19, 24, 29) and the secondary measurement sequence (20, 23, 28, 30) are combined with one another by means of a complementary fusion method (22) to form the vital parameter measurement sequence (21, 26, 31, 32), in order to offset detection errors (25).

9. The measurement method (1) according to claim 5, characterized in that the time-varying vital parameter detected with the induction measurement sequence (19, 24, 29) is a secondary influential variable component of the secondary measurement sequence (20, 23, 28, 30), and in the combination step (4), by means of a mutual compensation method, the secondary influential variable component of the secondary measurement sequence (20, 23, 28, 30) is diminished in the secondary measurement sequence (20, 23, 28, 30) based on the induction measurement sequence (19, 24, 29) and an additional predefined combination function.

10. The measurement method (1) according to claim 1, characterized in that, in the combination step (4), by combining the induction measurement sequence (19, 24, 29) with the secondary measurement sequence (20, 23, 28, 30) by means of a source separation method (27), which is based on a mathematical model which describes a correlation between the vital parameter represented in the induction measurement sequence (19, 24, 29) and the secondary influential variable component represented in the secondary measurement sequence (20, 23, 28, 30) and/or the vital parameter represented in the secondary measurement sequence (20, 23, 28, 30), at least one vital parameter measurement sequence (21, 26, 31, 32) is determined, with a vital parameter detected in the induction measurement sequence (19, 24, 29) and/or in the secondary measurement sequence (20, 23, 28, 30) being represented in the vital parameter measurement sequence (21, 26, 31, 32).

11. The measurement method (1) according to claim 10, characterized in that the source separation method (27) is carried out on the basis of an independent component analysis, a Kalman filtering or a principal component analysis.

12. The measuring apparatus (6) for detecting vital parameters in a human or animal body according to claim 1, characterized in that the measuring apparatus (6) comprises a magnetic induction sensor (7), an analysis unit (11) and a secondary sensor unit (10), the analysis unit (11) being connected to the magnetic induction sensor (7) and the secondary sensor unit (10) so as to enable signal transmission.

13. The measuring apparatus (6) according to claim 12, characterized in that the measuring apparatus (6) comprises a storage unit (12), which is connected to the analysis unit (11) so as to enable signal transmission, and is provided for storing the combination function and/or the induction measurement sequence (19, 24, 29) and/or the secondary measurement sequence (20, 23, 28, 30) and/or the vital parameter measurement sequence (21, 26, 31, 32).

14. The measuring apparatus (6) according to claim 12, characterized in that the secondary sensor unit (10) comprises at least one secondary sensor (8, 9) for detecting the secondary measurement sequence (20, 23, 28, 30).

15. The measuring apparatus (6) according to claim 14, characterized in that the secondary sensor (8, 9) employs a measuring principle different from the principle employed by the magnetic induction sensor (7).

16. The measuring apparatus (6) according to claim 14, characterized in that the secondary sensor (8, 9) is an optical sensor (13).

17. The measuring apparatus (6) according to claim 14, characterized in that the secondary sensor (8, 9) is an acceleration sensor (17).

18. The measuring apparatus (6) according to claim 14, characterized in that the secondary sensor (8, 9) is a sensor based on capacitance coupling.

19. The measuring apparatus (6) according to claim 14, characterized in that the secondary sensor (8, 9) is a distance sensor (15, 16).

20. The measuring apparatus (6) according to claim 1, characterized in that the measuring apparatus (6) is integrated into an automobile seat, an examination chair, a hospital bed or an article of clothing.