Method and Apparatus for Measuring and Monitoring Vital Functions or Presence

• US 20070276202A1
• Filed: 07/01/2005
• Published: 11/29/2007
• Est. Priority Date: 07/01/2004
• Status: Abandoned Application

• Current Assignee: Emfit Oy
• Original Assignee: Emfit Oy
• Inventors: Raisanen, Heikki, Virtanen, Tomi
• Application Number:
  US11/631,272
• Publication Number:
  US 20070276202A1
• Time in Patent Office: Days
• US Class Current: 600/301
• CPC Class Codes: A61B 5/1102 Ballistocardiography
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/447 specially adapted for aiding the prevention of ulcer or pressure sore development, i.e. before the ulcer or sore has developed
• CPC Class Codes: A61B 5/6892 Mats

Abstract

A procedure for the monitoring of a person or an animal on a base (2) with a device that has at least one plane like sensor element (3) arranged to it for transforming the mechanical forces caused by the measured movements and/or the vital signs to electric signals and a signal handling device (7) that registers the movements and/or the respiration frequency and/or the pulse frequency and/or the presence on a base with the help of the signals obtained from the sensor element, characterised in that that after the beginning filtering the sensor signal is divided to n subchannels, an absolute value is taken from the signal in the subchannels, every detected signal is low pass filtered so that highest measurable pulse and/or respiration frequency can be determined, every detected signal is high pass filtered so that lowest measurable pulse and/or respiration frequency can be determined, from these detected signals the intervals between the crossings of the zero points are measured, the alteration of the intervals is measured, from the sub channels the one with the least alteration is chosen, this interval is used to point out the pulse and/or respiration frequency.

Claims

1. A procedure for the monitoring of a person or an animal on a base (2) with a device that has at least one plane like sensor element (3) arranged to it for transforming the mechanical forces caused by the measured movements and/or the vital signs to electric signals and a signal handling device (7) that registers the movements and/or the respiration frequency and/or the pulse frequency and/or the presence on a base with the help of the signals obtained from the sensor element, characterised in that:

1.) After the beginning filtering the sensor signal is divided to n subchannels.

2.) An absolute value is taken from the signal in the subchannels,

3.) Every detected signal is low pass filtered so that highest measurable pulse and/or respiration frequency can be determined,

4.) Every detected signal is high pass filtered so that lowest measurable pulse and/or respiration frequency can be determined,

5.) From these detected signals the intervals between the crossings of the zero points are measured.

6.) The alteration of the intervals is measured,

7.) From the sub channels the one with the least alteration is chosen.

8.) This interval is used to point out the pulse and/or respiration frequency.

2. The procedure according to the claim 1, characterised in that the pass bands of the pass band filters are slightly overlapping.

3. The procedure according to the claim 1, characterised in that it includes 4 or more subchannels for different kind of bases or persons being measured.

4. The procedure according to the claim 1, characterised in that the device chooses automatically the sub channel that fits the best on the moment.

5. The procedure according the claim 1, characterised in that the most convenient sub channel is chosen manually by the user.

6. The procedure according to the claim 1 defines the average movement activity and/or respiration frequency and/or pulse frequency produced by the electric signals caused by the movements and vital signs of the measured person.

7. The procedure according to the claim six has a signal handling part in which the measuring time is divided into measurement periods (T). In the measurement one or more activity calculators (C(k)) are used. In the beginning of every measurement the calculator is reset to zero and in case the amplitude of the total value of the signal exceeds the preset threshold level, the activity calculator associated to the measurement period is raised.

8. The procedure according to the claim 7 has an signal handling part in which several threshold levels are defined and the signal amplitudes that has exceeded each separate threshold levels are registered to their own activity calculators.

9. The procedure according to the claim 1, characterised in that time periods with a risen movement activity grade are determined in it'"'"'s signal handling part by the electric signals caused by the movements of the measured subject. After this the calculation is reset to zero by itself and it begins a new time period to measure the movement activity.

10. A device to monitor a person or an animal on a base (2) with at least one customary sensor element (3) placed to the base to transfer the mechanical forces caused by the movement and/or the vital signs of the measured person into electric signals and a signal-processing device (7) that registers the movements and/or the respiration frequency and/or the pulse frequency and/or the presence on a base with the help of signals obtained from the sensor element, the method is characterised in that:

After the beginning filtering the sensor signal is divided into n pieces sub channels.

In the sub channel a total value is taken from the signal.

Every detected signal is low pass filtered so that the highest measurable pulse or respiration frequency can be determined.

Every detected signal high pass filtered so that the lowest measurable pulse or respiration frequency can be determined.

From these detected signals the intervals between the crossings of the zero points are measured.

The alteration of the intervals is measured.

From the sub channels the one with the least alteration is chosen.

This interval is used to point out the pulse and/or respiration frequency.

The sensor is dynamic.

11. The device according to the patent claim 10 has threshold value positioning organs that are used to define at least one threshold value to the electric signals before hand. The signal handling part defines the cumulative sum of the measured electric signals caused by the movements that exceeds the pre set threshold value on a wanted time period. It also evaluates the period that has a risen movement activity grade. The signal handling part also estimates the person'"'"'s condition and/or physic condition from the following periods average pulse frequency. The control unit divides the measuring time to measurement period'"'"'s (T) and one or more activity calculator (C(k)) are used in the measurement. The activity calculators are reset to zero in the beginning of the measurement and in case the total value of the signal amplitude exceeds the preset threshold level the activity calculator concerning the period is raised.

12. The device according to the claim 10 having a device attached to it so the person can call for nurse independently.

13. The device according to the claim 12 having a possibility to form a two-way talking connection between the monitored and the monitor.

14. The device according to the claim 10 means to transfer the registered information to be saved on the server.

15. The device according to the claim 10 having signal handling devices in the signal handling part also for the handling of the information obtained from the oxygen oxide metering unit and/or for transfer to the server.

16. The device according to the claim 10 having several entrances for the sensor elements and a multiplexing between them and an automatic locking system for the channel that gives the strongest signal on the wanted frequency area.