Apparatus and method for measuring biological information

• US 7,731,665 B2
• Filed: 09/05/2006
• Issued: 06/08/2010
• Est. Priority Date: 09/07/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hong, Hyung-Ki, Lee, Youn-Jae, Oh, Hyun-Ho, Cho, Seong-Moon, Jung, Min-Jae, Lee, Kwy-Ro
• Primary Examiner(s): Le; Long V
• Assistant Examiner(s): Weatherby; Ellsworth
• Application Number:
  US11/470,227
• Publication Number:
  US 20070078310A1
• Time in Patent Office: 1,372 Days
• Field of Search: 600/310, 600/323, 600/324, 600/473, 600/476, 600/500, 600/501, 600/502
• US Class Current: 600/501
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/4872 Body fat
• CPC Class Codes: A61B 5/6824 Arm or wrist
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

An apparatus and method for precisely measuring various biological information of a user'"'"'s body by using a single measuring apparatus enable precisely and effectively measuring biological information including body fat, pulse and a blood vessel aging degree. By measuring an infrared absorbance or infrared rays irradiated to a measurement target according to a modulation and tuning method and obtaining the information with reference to supplementary biological information obtained from a user, the plurality of biological information can be precisely measured at a low driving voltage through the modulation and tuning method by using a single infrared light source. Also, the measuring apparatus can be reduced in size by simplifying its construction and can be effectively integrated into various device.

Claims

1. An apparatus for measuring biological information comprising:

an input unit configured to receive an input from a user for selecting each of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode;

a memory configured to store biological information of the user;

an infrared ray transmission and reception unit configured to radiate infrared rays having a single wavelength, and measure an infrared absorbance of a certain portion of the user'"'"'s body by analyzing a reflected amount of the radiated infrared rays;

a controller configured to calculate each one of a body fat value, a pulse value and a blood vessel aging degree value based on the measured infrared absorbance and stored biological information according to the measurement mode selected via the input unit;

a current/voltage conversion unit configured to convert a current signal provided by the infrared ray transmission and reception unit into a voltage signal;

a low pass filter unit configured to filter the voltage signal to cancel radio frequency (RF) optical noise included in the voltage signal;

an amplifying unit configured to amplify the filtered voltage signal;

a high pass filter configured to filter direct current (DC) noise generated by a power source; and

a display unit configured to display at least one of the calculated body fat value, pulse value and blood vessel aging degree value,

wherein the single wavelength is the same in the body fat measurement mode, the pulse measurement mode and the blood vessel aging degree measurement mode.

2. The apparatus of claim 1, wherein the infrared ray transmission and reception unit comprises at least one infrared light emitting diode and one of at least one infrared sensitive photodiode and an infrared sensitive photo-transistor.

3. The apparatus of claim 1, wherein when the body fat measurement mode is selected, the controller calculates the body fat value by using the measured infrared absorbance and at least one of weight, height, gender and an amount of exercise of the user corresponding to the biological information.

4. The apparatus of claim 1, wherein when the pulse measurement mode is selected, the controller calculates the pulse value by analyzing a change of the infrared absorbance measurement value.

5. The apparatus of claim 1, wherein when the blood vessel aging degree measurement mode is selected, the controller calculates the blood vessel aging degree value by differentiating a signal change of the infrared absorbance measurement value by a certain number of times and analyzing the size and form of peaks of the differentiated signal.

6. The apparatus of claim 1, further comprising:

a transmission driving unit connected with the infrared ray transmission and reception unit and configured to provide a drive signal for transmission based on a particular modulation wavelength; and

a reception driving unit connected with the infrared ray transmission and reception unit configured to tune/demodulate a received signal and provide the processed signal to the controller.

15. The apparatus of claim 1, wherein the single wavelength is in a range of 700 nm to 1,000 nm.

19. The apparatus of claim 1, wherein the apparatus is integrated into a portable device comprising a mobile terminal, a remote controller, a mobile audio reproducing device, a mobile multimedia reproducing device, or a game player.

22. The apparatus of claim 1, wherein the measurement mode is selected from a group consisting of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode.

7. A method for measuring biological information, the method comprising:

receiving an input for selecting each of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode;

radiating infrared rays having a single wavelength to a particular portion of a user'"'"'s body, and measuring an infrared absorbance of the user'"'"'s body by analyzing a reflected amount of the radiated infrared rays;

calculating each of a body fat value, a pulse value and a blood vessel aging degree value based on the measured infrared absorbance and pre-set user biological information according to the selected measurement mode;

detecting and converting a current signal generated by the radiated infrared rays into a voltage signal;

filtering radio frequency (RF) optical noise included in the voltage signal by low-pass-filtering;

amplifying the filtered voltage signal;

filtering direct current (DC) noise generated by a power source by high-pass-filtering; and

displaying at least one of the calculated body fat value, the pulse value and the blood vessel aging degree value,

wherein the single wavelength is the same in the body fat measurement mode, the pulse measurement mode and the blood vessel aging degree measurement mode.

8. The method of claim 7, wherein, in the calculating step, when the body fat measurement mode is selected, a body fat value is calculated by using the measured infrared absorbance and at least one of weight, height, gender and an amount of exercise of the user corresponding to the biological information.

9. The method of claim 7, wherein, in the calculating step, when the pulse measurement mode is selected, a pulse value is calculated by analyzing a change of the infrared absorbance measurement value.

10. The method of claim 7, wherein, in the calculating step, when the blood vessel aging degree measurement mode is selected, the blood vessel aging degree value is calculated by differentiating a signal change of the infrared absorbance measurement value by a certain number of times and analyzing sizes and forms of peaks of the differentiated signal.

11. The method of claim 7, wherein the measuring the infrared absorbance comprises:

modulating the infrared rays with a modulation signal and radiating the infrared rays;

receiving an amount of reflection of the radiated infrared rays as an electrical signal; and

demodulating the received electrical signal based on the modulation signal.

16. The method of claim 7, wherein the single wavelength is in a range of 700 nm to 1,000 nm.

20. The method of claim 7, wherein the method is executed by a portable device comprising a mobile terminal, a remote controller, a mobile audio reproducing device, a mobile multimedia reproducing device, or a game player.

23. The method of claim 7, wherein the measurement mode is selected from a group consisting of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode.

12. A mobile terminal comprising:

a keypad configured to receive an input from a user for selecting each of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode;

a memory configured to store biological information of the user;

an infrared ray transmission and reception unit configured to radiate infrared rays having a single wavelength, and measure an infrared absorbance of a certain portion of the user'"'"'s body by analyzing an amount of infrared rays reflected therefrom;

a controller configured to calculate each of a body fat value, a pulse value and a blood vessel aging degree value based on the measured infrared absorbance and biological information according to the measurement mode selected by the user;

a voice conversion unit configured to convert at least one of the calculated body fat value, the pulse value and the blood vessel aging degree value into a voice signal and outputting the voice signal; and

a display unit configured to display at least one of the calculated body fat value, the pulse value and the blood vessel aging degree value,

wherein the single wavelength is the same in the body fat measurement mode, the pulse measurement mode and the blood vessel aging degree measurement mode.

17. The mobile terminal of claim 12, wherein the single wavelength is in a range of 700 nm to 1,000 nm.

24. The mobile terminal of claim 12, wherein the measurement mode is selected from a group consisting of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode.

13. A remote controller, comprising:

a keypad configured to receive an input from a user for selecting each of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode;

a memory configured to store biological information of the user;

an infrared ray transmission and reception unit configured to radiate infrared rays having a single wavelength, and measure an infrared absorbance value of a certain portion of the user'"'"'s body by analyzing an amount of the radiated infrared rays reflected therefrom;

a microcomputer configured to calculate each of a body fat value, a pulse value and a blood vessel aging degree value based on the measured infrared absorbance value and biological information according to the measurement mode selected by the user;

a local area communication unit configured to transmit at least one of the calculated body fat value, the pulse value and the blood vessel aging degree value to an external electronic device having a display unit,

wherein the single wavelength is the same in the body fat measurement mode, the pulse measurement mode and the blood vessel aging degree measurement mode.

14. The remote controller of claim 13, wherein the local area communication unit comprises at least one of an infrared data association (IrDA) device, a Bluetooth device and a ZigBee device.

18. The remote controller of claim 13, wherein the single wavelength is in a range of 700 nm to 1,000 nm.

21. The remote controller of claim 13, wherein the at least one of the calculated body fat value, pulse value or blood vessel aging degree value is output via an external control target device that is controlled by the remote controller, the control target device having a displaying or voice speaking means.

25. The remote controller of claim 13, wherein the measurement mode is selected from a group consisting of a body fat measurement mode, a pulse measurement mode and a blood vessel aging degree measurement mode.