Non-invasive heart monitoring apparatus and method

• US 6,129,677 A
• Filed: 08/10/1998
• Issued: 10/10/2000
• Est. Priority Date: 08/08/1997
• Status: Expired due to Fees

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kohden Corporation
• Inventors: Tanaka, Rie, Ono, Kohei, Sugo, Yoshihiro, Chen, Wenxi, Sohma, Takeshi, Kasuya, Hiromitsu
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US09/131,678
• Time in Patent Office: 792 Days
• Field of Search: 600/513
• US Class Current: 600/513
• CPC Class Codes: A61B 5/0285 Measuring or recording phase velocity of blood waves

Abstract

An apparatus for non-invasion heart monitoring includes electrocardiogram measuring means (1) for measuring electrocardiograms, pulse wave measuring means (2) for measuring pulse waves, and a CPU (30) for processing electrocardiogram signals derived from the electrocardiogram measuring means (1) and pulse wave signals derived from the pulse-wave measuring means (2). The CPU (30) detects the amplitudes of the pulse waves corresponding to the R waves of the cardiogram and the pulse wave propagation times, and computes a ratio (Nr/N) of the heart rate N and the heart rate Nr exclusive of the heart beats of wave deficits.

Claims

1. An apparatus for non-invasive heart monitoring comprising:

electrocardiogram measuring means for measuring electrocardiograms;

pulse wave measuring means for measuring pulse waves;

pulse wave data detecting means for detecting at least a pulse wave propagation time by use of electrocardiogram information measured by said electrocardiogram measuring means and pulse wave signals measured by said pulse wave measuring means; and

occurrence-frequency detecting means for determining a frequency of occurrence of a pulse deficit of a heart by use of pulse wave data detected by said pulse wave data detecting means.

2. The apparatus for non-invasive heart monitoring according to claim 1, wherein said pulse wave data detecting means also detects amplitudes of pulse waves measured by said pulse wave measuring means.

3. The apparatus for non-invasive heart monitoring according to claim 2, wherein said occurrence-frequency detecting means determines the frequency of occurrence of said pulse deficit by selecting pulse wave data having pulse wave propagation time greater than a predetermined period and pulse wave data having said amplitudes of pulse waves within a predetermined amplitude range.

4. The apparatus for non-invasive heart monitoring according to claim 1, wherein said occurrence-frequency detecting means determines said frequency of occurrence of said pulse deficit by selecting data from said pulse wave data having said pulse wave propagation time greater than a predetermined period.

5. A method for non-invasive heart monitoring, comprising the steps of:

measuring electrocardiograms of a patient;

measuring pulse waves of said patient;

detecting at least a pulse wave propagation time by use of measured electrocardiogram and pulse wave signals;

detecting amplitudes of pulse waves from the measured pulse wave signals;

storing the pulse wave propagation time and the amplitudes of measured pulse waves which are synchronized as a related data;

selecting data from the related data having pulse wave propagation time greater than a predetermined time period; and

determining a frequency of occurrence of a pulse deficit of a heart from the selected data.

6. The method for non-invasive heart monitoring as in claim 5, wherein selecting data further includes:

narrowing selected data with data having amplitudes within a predetermined range.

9. The method for non-invasive heart monitoring as in claim 6, further comprising the step of:

calculating an occurrence ratio (N_r /N) where (N) is a patient heart rate and (N_r) is a heart rate exclusive of heart beats with pulse deficits.

7. A method for non-invasive heart monitoring, comprising the steps of:

measuring electrocardiograms of a patient;

measuring pulse waves of said patient;

detecting at least a pulse wave propagation time from the measured electrocardiogram and pulse wave signals;

detecting amplitudes of the pulse waves from the measured pulse wave signals;

storing the pulse wave propagation time and the amplitudes of the measured pulse waves which are synchronized as a related data;

selecting data having amplitudes of the pulse wave within a predetermined range from the related data; and

determining a frequency of occurrence of a pulse deficit of a heart from the selected data.

8. The method for non-invasive heart monitoring as in claim 7, wherein selecting data further includes:

narrowing selected data with data having pulse wave propagation time greater than a predetermined time period.

10. The method for non-invasive heart monitoring as in claim 8, further comprising the step of:

calculating an occurrence ratio (N_r /N) where (N) is a patient heart rate and (N_r) is a heart rate exclusive of heart beats with pulse deficits.

11. An apparatus for non-invasive heart monitoring comprising:

an electrocardiogram for measuring a patient electrocardiogram signal;

a pulse wave measuring means for measuring a patient pulse wave signal;

a computer means receiving the measured signals from said electrocardiogram and said pulse wave measuring means, said computer means calculating and storing a pulse wave propagation time data and a pulse wave amplitude data, said computer means determining a frequency of occurrence of a pulse deficit of a heart by selecting said pulse wave propagation time data and said pulse wave amplitude data within a predetermined range of propagation time and amplitude values.

12. The apparatus for non-invasive heart monitoring as in claim 11, further comprising:

a display means for continuously displaying said patient electrocardiogram signal, said patient pulse wave signal, and the frequency of occurrence of said pulse deficit, said frequency of occurrence of said pulse deficit being displayed as a ratio (N_r /N), where N is a heart rate of a patient, and N_r is a heart rate of a patient exclusive of heartbeats with pulse deficits.