Wireless heart rate sensing system and method

• US 20050143667A1
• Filed: 06/10/2004
• Published: 06/30/2005
• Est. Priority Date: 12/26/2003
• Status: Abandoned Application

• Current Assignee: Information and Communications University Educational Foundation
• Original Assignee: Information and Communications University Educational Foundation
• Inventors: Park, Jung-Min, Park, Seong-Ook, Kwon, Young-Bae
• Application Number:
  US10/865,706
• Publication Number:
  US 20050143667A1
• Time in Patent Office: Days
• US Class Current: 600/509
• 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 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/0507 using microwaves or terahertz waves

Abstract

Disclosed is a wireless heart rate sensing system which comprises: an oscillator for generating signals of a specific frequency; a power divider for dividing power of the signals generated by the oscillator; a transmit antenna for radiating a first signal output by the power divider to a patient'"'"'s chest; a receive antenna for receiving a signal, the frequency of which is transited by a motion of the patient'"'"'s chest and which is reflected and returned; a mixer for combining frequency components of an RF signal received through the receive antenna and a second signal output by the power divider; and a baseband unit for filtering the signal combined by the mixer, converting it into a digital signal, and outputting the digital signal.

Claims

1. A wireless heart rate sensing system comprising:

an oscillator for generating signals of a specific frequency;

a power divider for dividing power of the signals generated by the oscillator;

a transmit antenna for radiating a first signal output by the power divider to a patient'"'"'s chest;

a receive antenna for receiving a signal, the frequency of which is transited by a motion of the patient'"'"'s chest and which is reflected and returned;

a mixer for combining frequency components of an RF signal received through the receive antenna and a second signal output by the power divider; and

a baseband unit for filtering the signal combined by the mixer, converting it into a digital signal, and outputting the digital signal.

2. The wireless heart rate sensing system of claim 1, further comprising a low noise amplifier, connected between the receive antenna and the mixer, for eliminating noise from the signal received through the receive antenna, maximizing a gain, and outputting a result signal.

3. The wireless heart rate sensing system of claim 1, wherein the transmit antenna and the receive antenna are respectively a circular polarized antenna with a different polarized component.

4. The wireless heart rate sensing system of claim 1, wherein the transmit antenna and the receive antenna have a patch antenna format in which a cavity is provided between the two antennas on a single substrate.

5. The wireless heart rate sensing system of claim 1, wherein the baseband unit filters the signals through the IIR (infinite impulse response) filtering method.

6. A wireless heart rate sensing method comprising:

(a) power-dividing an oscillated signal and radiating it to a patient'"'"'s chest;

(b) receiving the signal, the frequency of which is transited by a motion of the patient'"'"'s chest, and which is then reflected and returned;

(c) combining frequency components of the received signal and the power-divided signal; and

(d) filtering the combined signals, converting them into digital signals, and displaying them on a monitor.

7. The wireless heart rate sensing method of claim 6, further comprising, between (b) and (c), eliminating noise from the received signals, and maximizing a gain.

8. The wireless heart rate sensing method of claim 7, wherein (a) and (b) comprise using a circular polarization phenomena with different polarized components, and transmitting and receiving signals.

9. A wireless heart rate sensing method comprising:

(a) power-dividing an oscillated signal, and radiating the signal to a patient'"'"'s chest through an antenna with a circular polarized component in a first direction;

(b) receiving the signal, the frequency of which is transited by a motion of the patient'"'"'s chest, and which is then reflected and returned, at an antenna with a circular polarized component in a second direction;

(c) combining frequency components of the received signal and the power-divided signal; and

(d) filtering the combined signals, converting them into digital signals, and displaying the digital signals on a monitor.

10. The wireless heart rate sensing method of claim 9, wherein the first direction is the right (or left) direction and the second direction is the left (or right) direction.