Method and apparatus for cufflessly and non-invasively measuring wrist blood pressure in association with communication device

• US 8,086,301 B2
• Filed: 03/11/2008
• Issued: 12/27/2011
• Est. Priority Date: 03/12/2007
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Jae-Geol, Jung, Sun-Tae, Im, Jae-Joong
• Primary Examiner(s): Gedeon, Brian T
• Application Number:
  US12/075,377
• Publication Number:
  US 20080228089A1
• Time in Patent Office: 1,386 Days
• Field of Search: 600/509, 600/513, 600/516, 600/517
• US Class Current: 600/513
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle

Abstract

A method of cufflessly and non-invasively measuring blood pressure in a wrist region of a patient in association with a communication device that relays the information being measured includes: detecting a magnitude difference between a plurality of pulse wave signals detected from a wrist of a user; detecting feature points from an electrocardiogram (ECG) and pulse wave signals detected from the user; extracting variables needed to calculate the highest blood pressure and the lowest blood pressure using the detected feature points; and calculating the highest blood pressure and the lowest blood pressure of the user by deducing a scatter diagram using the extracted variables.

Claims

1. A method of cufflessly and non-invasively measuring wrist blood pressure in association with a communication device, the method comprising:

(a) detecting an electrocardiogram (ECG) using an ECG sensor, detecting infrared pulse waves using an infrared sensor, and detecting pressure pulse wave signals using a pressure sensor, the ECG, infrared pulse waves and pressure pulse waves being detected from a wrist region of a user;

(b) detecting feature points from the ECG, the infrared pulse waves and the pressure pulse wave signals detected in (a) from the user;

(c) extracting variables for calculating a highest blood pressure and a lowest blood pressure by applying the feature points detected in step (b) to a blood pressure calculation algorithm; and

(d) calculating the highest blood pressure and the lowest blood pressure of the user by deducing a scatter diagram using the extracted variables and compensating using absolute pressure to correct a magnitude of a detected pulse after comparing the infrared pulse wave signals to each other to obtain a vector component to search for a measured position and depth of an artery; and

transmitting the calculated data to a portable communication device.

2. The method of claim 1, wherein the detecting of the feature points from the ECG and pulse wave signals detected from the user in step (b) comprises:

(i) detecting an R-peak in a P-QRS-T waveform indicating one period of electric activity of a heart from the measured ECG signal; and

(ii) detecting a beginning point, the highest point, and a notch point of the R-peak,

wherein R-peak denotes a de-polarization timing of the left ventricle of the heart.

3. The method of claim 2, wherein the calculating of the highest blood pressure and the lowest blood pressure comprises:

deducing a linear regression expression by using the extracted variables as independent variables; and

calculating the highest blood pressure and the lowest blood pressure of the user from the deduced linear regression expression.

4. The method according to claim 3, further comprising (e) transmitting the highest and lowest blood pressure values calculated are transmitted to an external device.

5. The method according to claim 3, further comprising (e) storing the highest and lowest blood pressure values from step (d) in a memory.

6. The method according to claim 3, further comprising (e) display the highest and lowest blood pressure values calculated in step (d).

7. The method according to claim 1, wherein the ECG sensor and pressure sensor are integrated in a sensor unit for measuring blood pressure in a wrist region without a cuff.

8. The method according to claim 1, further comprising (e) transmitting the highest and lowest blood pressure values calculated are transmitted to an external device.

9. A method of cufflessly and non-invasively measuring wrist blood pressure in association with a communication device, the method comprising:

(a) detecting an electrocardiogram (ECG) and pulse wave signals from a wrist region of a user using an ECG sensor and a pressure sensor;

(b) detecting feature points from the ECG and pulse wave signals detected from the user;

(c) extracting variables for calculating a highest blood pressure and a lowest blood pressure by applying the feature points detected in step (b) to a blood pressure calculation algorithm; and

(d) calculating the highest blood pressure and the lowest blood pressure of the user by deducing a scatter diagram using the extracted variables,

wherein the detecting of the ECG and pulse wave signals in step (a) comprises;

(i) setting a criterion of pressure applied to the wrist using magnitude differences of the measured more than one pulse wave signals; and

(ii) compensating for a user environment, including at least one of a position and depth of an artery measured using an infrared sensor, and a criterion value change according to a sensor applied pressure difference.

10. A method of cufflessly and non-invasively measuring wrist blood pressure in association with a communication device, the method comprising:

(a) detecting an electrocardiogram (ECG) and pulse wave signals from a wrist region of a user using an ECG sensor and a pressure sensor;

(b) detecting feature points from the ECG and pulse wave signals detected from the user;

(c) extracting variables for calculating a highest blood pressure and a lowest blood pressure by applying the feature points detected in step (b) to a blood pressure calculation algorithm; and

(d) calculating the highest blood pressure and the lowest blood pressure of the user by deducing a scatter diagram using the extracted variables,

wherein the variables for calculating the highest blood pressure and the lowest blood pressure comprises a time value from a detected R-peak of the ECG signal to a pulse wave beginning point, a time value from the R-peak to a pulse wave highest point, a time value from the pulse wave beginning point to a pulse wave highest point, a time value from the pulse wave highest point to a pulse wave notch point, and an area value from the pulse wave beginning point to the pulse wave notch point, and

the R-peak obtained from the ECG signal is used as a criterion value of time.

11. A method of cufflessly and non-invasively measuring wrist blood pressure in association with a communication device, the method comprising:

(a) detecting an electrocardiogram (ECG) and pulse wave signals from a wrist region of a user using an ECG sensor and a pressure sensor;

(b) detecting feature points from the ECG and pulse wave signals detected from the user;

(c) extracting variables for calculating a highest blood pressure and a lowest blood pressure by applying the feature points detected in step (b) to a blood pressure calculation algorithm; and

(d) calculating the highest blood pressure and the lowest blood pressure of the user by deducing a scatter diagram using the extracted variables,

(e) transmitting the highest and lowest blood pressure values calculated are transmitted to an external device;

wherein the detecting of the feature points from the ECG and pulse wave signals detected from the user in step (b) comprises;

(i) detecting an R-peak in a P-QRS-T waveform indicating one period of electric activity of a heart from the measured ECG signal; and

(ii) detecting a beginning point, the highest point, and a notch point of the R-peak,

wherein R-peak denotes a de-polarization timing of the left ventricle of the heart;

wherein the calculating of the highest blood pressure and the lowest blood pressure comprises;

deducing a linear regression expression by using the extracted variables as independent variables; and

calculating the highest blood pressure and the lowest blood pressure of the user from the deduced linear regression expression, and

wherein the highest and lowest blood pressure values are transmitted when the values exceed a predetermined threshold value.