Medical device with real-time physiological signal analysis function

• US 20090156949A1
• Filed: 04/14/2008
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Abandoned Application

• Current Assignee: Chung-Yuan Christian University
• Original Assignee: Chung-Yuan Christian University
• Inventors: Lee, Shih Yu, Lin, Yong Tai, Shyu, Liang-Yu, HU, Wei-Chih
• Application Number:
  US12/102,020
• Publication Number:
  US 20090156949A1
• Time in Patent Office: Days
• US Class Current: 600/515
• 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 5/02405 Determining heart rate variability
• CPC Class Codes: A61B 5/0245 by using sensing means generating electric signals, i.e. ECG signals
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/7257 using Fourier transforms

Abstract

A medical device with real-time physiological signal analysis function is disclosed. An ECG signal is generated by detection of detection circuit to the human heart while conversion circuit receives the ECG signal and converts it into an ECG data. The ECG data is sent to a process control unit for being processed to generate a HRV parameter. The ECG data and the HRV parameter are shown by a display unit for real-time analysis of changes of HRV in time domain and frequency domain. Thus doctors can make diagnosis according to these data. Moreover, The process control unit is coupled to the memory module so as to save the ECG data and the HRV parameter. Thus after long-term data collection of the ECG and HRV, doctors can make diagnosis by means of these data.

Claims

1. A medical device with real-time physiological signal analysis function comprising:

a detection circuit that detects a human heart to generate an electrocardiographic(ECG) signal;

a conversion circuit that receives the ECG signal and converts the ECG signal into an ECG data;

a process control unit for receiving and processing the ECG data so as to generate a HRV(Heart Rate Variability) parameter;

a memory module for saving the ECG data and the HRV parameter; and

a display unit that receives and displays the ECG data and the HRV parameter.

2. The device as claimed in claim 1, wherein the device further comprising:

a computer receiving the ECG data and the HRV parameter for display and storage of the ECG data and the HRV parameter.

3. The device as claimed in claim 2, wherein the device further comprising:

a transmission interface coupled to the computer and the process control unit for transmission of the ECG data and the HRV parameter.

4. The device as claimed in claim 3, wherein the transmission interface is a universal serial bus (USB) interface, a Peripheral Component Interconnect (PCI) card, a 1394 interface, a local area network (LAN) interface (IEEE802.3), an infrared (IrDA) interface, or a Bluetooth interface.

5. The device as claimed in claim 1, wherein the memory module comprising:

a first memory unit and a second memory unit respectively for saving the ECG data and for saving the HRV parameter.

6. The device as claimed in claim 1, wherein the process control unit comprising:

an analysis process module that receives and processes the ECG data to generate the HRV parameter; and

a peripheral control module that receives the ECG data and the HRV parameter, and sends them to the memory module and the display unit.

7. The device as claimed in claim 6, wherein the process control unit further comprising:

a keyboard module for control of the analysis process module and the peripheral control module to receive the ECG data and the HRV parameter.

8. The device as claimed in claim 7, wherein the process control unit further comprising:

a computation module that receives and processes the ECG data to generate a R-R interval;

a re-sampling unit that receives and samples the R-R interval to generate a equal sampled signal;

a Fourier Transform module that receives and turns the sampled signal to generate a spectrum signal; and

a square root calculation module that receives and processes the spectrum signal so as to generate the HRV parameter.

9. The device as claimed in claim 8, wherein the process control unit further comprising:

a handshake interface that receives and sends the ECG data to the computation module by a handshake procedure.

10. The device as claimed in claim 8, wherein the computation module comprising:

a first processing unit that receives and differentiates the ECG data and then takes the absolute value to get a differential data;

a second processing unit that receives and calculates the moving average of the differential data to generate a moving average data; and

a retrieving unit that detects the moving average data for retrieving a plurality of R waves to calculate the R-R interval.

11. The device as claimed in claim 8, wherein the Fourier Transform module comprising:

a Fourier Transform unit that turns the sampled signal into the spectrum signal having a real number and an imaginary number;

a first storage unit for saving the real number; and

a second storage unit for saving the imaginary number.

12. The device as claimed in claim 8, wherein the square root calculation module comprising:

a conversion unit that turns the real number and the imaginary number of the spectrum signal into an unsigned number of the spectrum signal;

a first processing unit for adding square of the unsigned number to get a square sum data; and

a second processing unit that takes the square root of the square sum data to generate the HRV parameter.

13. The device as claimed in claim 7, wherein the peripheral control module comprising:

a frequency divider module that receives the ECG data and the HRV parameter, reduces frequency of the ECG data as well as the HRV parameter and then reduced ECG data as well as reduced HRV parameter are saved into the memory module.

14. The device as claimed in claim 13, wherein the peripheral control module further comprising:

a handshake interface that receives and transmits the reduced ECG data to the memory module by a handshake procedure.

15. The device as claimed in claim 13, wherein the peripheral control module further comprising:

a switch unit that receives and switches the ECG and the HRV parameter into the display unit.

16. The device as claimed in claim 15, wherein the peripheral control module further comprising:

a handshake interface that receives and transmits the reduced ECG data and the reduced HRV parameter to the switch unit by a handshake procedure.

17. The device as claimed in claim 1, wherein the process control unit is a Field Programmable Gate Array (FPGA).

18. The device as claimed in claim 1, wherein the memory module is a flash memory.