Apparatus for measuring biological signal

• US 5,392,780 A
• Filed: 12/17/1992
• Issued: 02/28/1995
• Est. Priority Date: 12/19/1991
• Status: Expired due to Fees

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kogden Corporation
• Inventors: Ogino, Yoshio, Ito, Kideki
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): GILBERT, SAMUEL G
• Application Number:
  US07/991,754
• Time in Patent Office: 803 Days
• Field of Search: 128/670, 128/671, 128/696, 128/700, 128/710, 128/709, 128/712, 364/413.02, 364/413.03, 364/413.06, 364/413.22, 346/33 ME
• US Class Current: 600/483
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

An object of the present invention is to provide an apparatus for measuring biological signals, which is capable of displaying marker lines on a time axis in synchronism with a particular position of a reference wave so that, if an electrocardiogram is selected as the reference wave, a plurality of other biological signals can be monitored in comparison with the electrocardiogram. According to the present invention, an apparatus for measuring biological signals includes an input unit for simultaneously receiving and amplifying a plurality of biological signal waveforms; a memory device for storing the plurality of biological signal waveforms input through the input device; a marker line synchronizing position setting device for determining a marker position by setting an arbitrary position of at least a single biological signal waveform that serves as a reference signal selected from the plurality of biological signal waveforms stored in the memory device; a marker line generating device for generating a marker line at the position set by the marker line synchronizing position setting device; and a display device for displaying the plurality of biological signal waveforms stored in the memory device and displaying the marker line generated by the marker line generating device such that it intersects the time axis of the plurality of biological signal waveforms orthogonally.

Claims

1. An apparatus for measuring biological signals, comprising:

an input device receiving and amplifying a plurality of biological signal waveforms simultaneously and outputting amplified signals;

a memory device, coupled to said input device, said memory device receiving and storing said amplified signals;

a waveform recognition processor coupled with said memory device and designed to locate at least one predetermined feature of at least one of said biological signal waveforms;

a marker line synchronizing position setting device, coupled to said waveform recognition processor, said marker line synchronizing position setting device setting a marker position based on a selection input selecting a position relative to said predetermined feature of said at least one biological signal waveform, said at least one biological signal waveform corresponding to a reference signal;

a marker line signal generating device, coupled to said marker line synchronizing position setting device, said marker line signal generating device receiving said marker position and generating a marker line signal corresponding to said marker position set by said marker line synchronizing position setting device; and

a display device, coupled to said marker line signal generating device, said display device receiving said amplified signals and said marker line signal, and displaying waveform outputs corresponding to said plurality of biological signal waveforms, and displaying a marker line corresponding to said marker line signal generated by said marker line generating device, whereby said marker line orthogonally intersects a time axis of said plurality of biological signal waveforms.

2. An apparatus for measuring biological signals as claimed in claim 1, wherein said reference signal is an electrocardiographical signal.

3. An apparatus for measuring biological signals as claimed in claim 2, wherein said predetermined feature is at least one of a P wave, a QRS wave or a T wave.

4. A method for displaying a plurality of biological signals, said method comprising the steps of:

reading waveforms indicative of said biological signals into a memory;

setting a marker line display position for a marker line, by synchronizing said marker line with one of said biological signals;

automatically locating at least one predetermined feature of at least one of said waveforms by forming a detecting point;

reading a memory address of said detecting point;

converting said memory address into a display address in a waveform display memory;

generating a marker signal from said marker line display position;

composing a display of said biological signals and said marker line based on said waveforms, said display address and said marker signal; and

continuously displaying said display such that said marker line is displayed relative to a time axis of at least one of said biological signals.

5. A method as claimed in claim 4, wherein said biological signals read in said reading step comprises an electrocardiogram.

6. A method as claimed in claim 4, wherein said at least one predetermined feature located in said locating step is one of a P-wave, a QRS-wave, or a T-wave in an electrocardiogram waveform.

7. A method as claimed in claim 4, wherein said at least one predetermined feature located in said locating step is a point in one of said waveforms.

8. A method as claimed in claim 4, wherein said at least one predetermined feature located in said locating step is a pattern in one of said waveforms.

9. A method as claimed in claim 4, wherein said converting step comprises

receiving a correction value;

and

determining said display address based on said memory address and said correction value.

10. An apparatus for measuring biological signals, comprising:

an input means for receiving and amplifying a plurality of biological signal waveforms;

a memory means for storing said plurality of amplified biological signal waveforms input through said input means;

a recognizing means for detecting at least one predetermined feature of at least one of said amplified biological signal waveforms and outputting a detected feature signal;

a marker line synchronizing position setting means for setting a marker position based on said detected feature signal;

a marker line generating means for generating a marker line at said marker position set by said marker line synchronizing position setting means; and

a display means for displaying said plurality of biological signal waveforms and displaying said marker line generated by said marker line generating means, whereby said marker line orthogonally intersects a time axis of said plurality of biological signal waveforms.

11. An apparatus for displaying biological signals, comprising:

a signal input designed to receive and digitize a plurality of contemporaneous biological signal waveforms, and to output digitized waveform signals;

a selection input which receives and processes at least one marker line position selection and outputs a setting signal;

a memory, coupled with said signal input, which stores the digitized waveform signals;

a waveform recognition processor coupled with said memory and designed to locate at least one predetermined feature of the biological signal waveforms by processing the digitized waveform signals and outputting at least one feature output;

a marker line position processor, coupled to said waveform recognition processor and said selection input, which receives the at least one feature output, receives the setting signal and generates marker line data based on the at least one feature output and the setting signal;

a display unit, coupled with said memory and said marker line position processor, which generates and displays a composite signal and marker data based on the digitized waveform signals and the marker line data.

12. An apparatus according to claim 11, wherein said memory comprises a random access memory.

13. An apparatus according to claim 11, wherein said signal input comprises an electrocardiogram amplifier.

14. An apparatus according to claim 11, wherein said signal input comprises at least one blood pressure amplifier.

15. An apparatus according to claim 11, wherein said signal input comprises a pulse wave amplifier.

16. An apparatus according to claim 11, wherein said signal input comprises a phonocardiogram amplifier.

17. An apparatus according to claim 11, wherein said waveform recognition processor is designed to locate at least one of a P-wave, a QRS-wave or a T-wave in an electrocardiogram signal waveform.

18. An apparatus according to claim 11, wherein said waveform recognition processor is designed to locate a point in the biological signal waveforms.

19. An apparatus according to claim 11, wherein said waveform recognition processor is designed to locate a pattern in the biological signal waveforms.

20. An apparatus according to claim 11, wherein said selection input is designed to further receive and process at least one correction value.

21. An apparatus according to claim 11, wherein said display unit comprises a video monitor.

22. An apparatus according to claim 11, wherein said display unit comprises a printer.

23. An apparatus according to claim 11, wherein said waveform recognition processor and said marker line position processor comprise a central processing unit and a read-only memory.