Surgery – Truss – Pad
Patent
1989-04-11
1991-11-19
Smith, Ruth S.
Surgery
Truss
Pad
A61B 50402
Patent
active
050657666
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for detecting R-waves in an electrocardiogram, which device can positively detect R-waves from among electrocardiographic wave patterns
BACKGROUND ART
Various means have hitherto been employed for the positive detection of R-waves in an electrocardiogram. The method most generally used comprises passing the frequency band including the R-waves though a filter and generating pulses by a single stable multi-vibrator when a predetermined threshold value is surpassed. Such a method may be effective for performing a simple count of a heart rate, but it is not suitable for reading information including various bits of phase information from electrocardiographic wave patterns, since it cannot recognize the peak phase (time phase) of an R-wave. Further, if arrhythmia or a normal R-wave appears together with the artifact through lung or body movement, a problem arises in that it is difficult to accurately detect and recognize the arrhythmia or normal R-wave due to a change in the wave pattern.
DISCLOSURE OF THE INVENTION
An object of the present invention is to solve the problems of the prior art mentioned above by providing a device for detecting R-waves in an electrocardiogram, in which R-wave pulses are generated by holding the phase (time phase) of the R-wave, more preferably by correspondingly changing the reference voltage in order to discriminate the R-wave from a T-wave or noise.
The device of the present invention for detecting an R-wave in an electrocardiogram comprises a filter for passing a frequency band including the R-wave in an electrocardiogram and a peak hold circuit for forming R-wave pulse signals from the signals passed through the above filter by holding the peak phase of the R-wave and the voltage.
BRIEF EXPLANATION OF THE DRAWINGS
FIG. 1 is a block diagram of the R-wave detecting device of the present invention;
FIG. 2 is a circuit diagram of the portion A enclosed within the broken line in FIG. 1;
FIG. 3 shows the wave patterns of the respective portions in FIG. 1 and FIG. 2;
FIG. 4 is a block diagram showing another example of the portion A enclosed within the broken line in FIG. 1;
FIG. 5 shows the wave patterns of the respective portions in FIG. 1 and FIG. 4; and
FIG. 6 shows the wave patterns of the respective portions in FIG. 1 and FIG. 4 when a deformed R-wave is input.
PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION
Preferable embodiments of the present invention will be now explained with reference to the drawings.
FIG. 1 is a block diagram of the device for detecting R-waves in an electrocardiogram, according to the present invention. The block diagram shows an electrocardiogram input terminal (11), a filter (12) for passing frequency components including an R-wave from the electrocardiogram input, a peak hold circuit (13) for forming R-wave pulses, a reference voltage setting means (14) for setting the reference voltage value of the above peak hold circuit (13), and an output terminal (16) for outputting R-wave pulses.
The peak hold circuit (13) enclosed within the broken line in FIG. 1 consists of a comparator (COMP), a diode (D), a capacitor (C), and a resistance (R), as shown in FIG. 2. The reference voltage setting circuit (14) of the portion A enclosed within the broken line in FIG. 1 consists of a field effect transistor (FET) and a bias voltage +Vb.
The input terminal (20) for supplying an R-wave is connected to the non-reversal input terminal (23) of the comparator (COMP), the output (25) of the comparator (COMP) is supplied to the pulse output (21), and is also connected through the diode (D) to the (+) terminal of the capacitor (C). The output of the (+) terminal of (24) of the comparator (COMP), and is also connected to the terminal (28) of the field effect transistor (FET). A bias voltage +Vb is supplied to the terminal (26) of the field effect transistor (FET). Here, the voltage E.sub.2 at the reversal input terminal (24) of the comparator (COMP) shown in FIG. 3(c) can be set higher than the a
REFERENCES:
patent: 3590811 (1971-07-01), Harris
patent: 3939824 (1976-02-01), Arneson et al.
patent: 4216780 (1980-08-01), Rubel et al.
patent: 4240442 (1980-12-01), Andresen et al.
Dimmick et al., IBM Technical Disclosure Bulletin, "Physiological Monitor System", vol. 19, No. 3, Aug. 1976, pp. 776-778.
Kabushiki Kaisya Advance Kaihatsu Kenkyujo
Smith Ruth S.
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