METHOD AND APPARATUS FOR MEASURING CHANGE IN BLOOD PRESSURE BY RESPIRATION CONTROL

• US 20140031638A1
• Filed: 03/14/2013
• Published: 01/30/2014
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: CHO, Jae-Geol, JUNG, Sun-Tae
• Granted Patent: US 9,918,645 B2
• Time in Patent Office: Days
• US Class Current: 600/301
• CPC Class Codes: A61B 5/0082 adapted for particular medical purposes
• 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 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/4848 Monitoring or testing the effects of treatment, e.g. of medication
• CPC Class Codes: A61B 5/486 Bio-feedback A61B5/375 takes precedence
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence

Abstract

A method and an apparatus are provided for measuring a change in blood pressure caused by respiration control. A number of respirations per minute is measured based on a heart rate when a respiration exercise begins. Respiration of a subject is induced until the number of respirations per minute reaches a predetermined number of respirations per minute. A pulse transit time is calculated during the respiration exercise, a blood pressure value associated with the pulse transit time is calculated, and the blood pressure value is outputted.

Claims

1. A blood pressure measuring apparatus for measuring a change in blood pressure caused by respiration control, the apparatus comprising:

a blood pressure measuring module for measuring blood pressure by pressurizing and depressurizing a cuff; and

a controller for measuring a number of respirations per minute based on a heart rate when a respiration exercise begins, inducing respiration of a subject until the number of respirations per minute reaches a predetermined number of respirations per minute, calculating a pulse transit time during the respiration exercise, and calculating and outputting a blood pressure value associated with the pulse transit time.

2. The apparatus of claim 1, further comprising:

a PhotoPlethysmoGraphy (PPG) module for detecting a pulse wave signal of the subject; and

an ElectroCardioGram (ECG) module for detecting an ECG signal of the subject.

3. The apparatus of claim 2, wherein the controller calculates an initial pulse transit time using the pulse wave signal and the ECG signal, draws and stores a correlation equation between the initial pulse transit time and the blood pressure measured when the cuff is pressurized.

4. The apparatus of claim 3, wherein the controller calculates the blood pressure value associated with the pulse transit time by using the correlation equation.

5. The apparatus of claim 2, wherein the controller calculates the heart rate using the pulse wave signal or the ECG signal when the respiration exercise begins.

6. The apparatus of claim 3, wherein the controller calculates the pulse transit time using the pulse wave signal and the ECG signal in a state in which the cuff is removed when the respiration exercise begins, and calculates the blood pressure value by substituting the pulse transit time in the correlation equation.

7. The apparatus of claim 1, wherein the controller outputs the calculated blood pressure value when the number of respirations per minute reaches the predetermined number of respirations per minute.

8. The apparatus of claim 1, wherein the controller outputs a blood pressure measurement result including at least one of a blood pressure value measured before the respiration exercise and a blood pressure value calculated during the respiration exercise, when the number of respirations per minute reaches the predetermined number of respirations per minute.

9. The apparatus of claim 1, wherein the controller measures the number of respirations per minute in a state where the cuff is not pressurized when the respiration exercise begins.

10. The apparatus of claim 1, further comprising:

a display unit for outputting contents that induce respiration of the subject until the number of respirations per minute reaches the predetermined number of respirations per minute, based on the controller.

11. The apparatus of claim 1, further comprising:

a speaker to output a sound guidance to induce respiration of the subject until the measured number of respirations per minute reaches the predetermined number of respirations per minute.

12. A method of measuring a change in blood pressure caused by respiration control in a blood pressure measuring apparatus, the method comprising the steps of

measuring a number of respirations per minute based on a heart rate when a respiration exercise begins;

inducing respiration of a subject until the number of respirations per minute reaches a predetermined number of respirations per minute; and

calculating a pulse transit time during the respiration exercise, calculating a blood pressure value associated with the pulse transit time, and outputting the blood pressure value.

13. The method of claim 12, further comprising:

calculating an initial pulse transit time using an ElectroCardioGram (ECG) signal or a pulse wave signal of the subject; and

drawing and storing a correlation equation between the initial pulse transit time and a blood pressure measured when a cuff wound around an upper arm of the subject is pressurized.

14. The method of claim 13, wherein the blood pressure value associated with the pulse transit time is calculated by using the correlation equation.

15. The method of claim 13, wherein the heart rate is calculated based on the ECG signal or the pulse wave signal in a state where the cuff is removed.

16. The method of claim 13, wherein calculating and outputting the blood pressure value comprises:

calculating the pulse transit time using the pulse wave signal and the ECG signal in a state where the cuff is removed; and

calculating the blood pressure value by substituting the pulse transit time in the correlation equation.

17. The method of claim 12, wherein inducing respiration of the subject comprises:

outputting contents that induce respiration of the subject through a display unit or a speaker.

18. The method of claim 12, wherein calculating and outputting the blood pressure value comprises:

outputting a blood pressure measurement result including at least one of a blood pressure value measured before the respiration exercise and a blood pressure value calculated during the respiration exercise, when the number of respirations per minute reaches the predetermined number of respirations per minute.