JP2795260B2 - Waveform drawing device for patient monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform drawing apparatus used in a patient monitoring system for monitoring a biological phenomenon of a patient, and for emphasizing a specific portion when drawing a biological signal waveform.

[0002]

2. Description of the Related Art Conventionally, in this type of waveform drawing apparatus, a biological signal waveform is drawn with a fixed line width. Further, when a specific portion of the biological signal waveform is emphasized, luminance modulation is used.

[0003]

However, the brightness modulation has a problem that the structure for changing the brightness becomes complicated. Also, for a user of the patient monitoring system, the brightness modulation is not easy to see because a bright part is generated.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a waveform drawing apparatus for a patient monitoring system which can emphasize a specific portion of a biological signal waveform with a simple structure and has excellent visibility.

[0005]

A waveform drawing apparatus according to the present invention is used in a patient monitoring system for monitoring a biological phenomenon of a patient, and draws a biological signal waveform. That is, data input means for inputting two numerical data representing biological signals at two consecutive times at a fixed time interval, and a data difference calculating means for calculating a difference between the two numerical data input by the data input means And a line width determining means for determining the line width of the biological signal waveform according to the difference between the numerical data calculated by the data difference calculating means.
Then , the line width determining means determines the line width to be large when the difference between the numerical data is small, and to reduce the line width when the difference between the numerical data is large . or
, The line width determining unit is smaller the line width when the difference of the numerical data is smaller, in which largely determines the line width when the difference of the numerical data is larger.

[0006] After the two numerical data are output to the data input means, their difference is calculated by the data difference calculation means. The line width determining means determines the line width of the biological signal waveform according to the difference. Then , the line width of the portion where the difference between the numerical data is small is increased, and the line width of the portion where the difference between the numerical data is large is reduced. Then, the flat part of the biological signal waveform is emphasized thickly. Conversely, the line width of the portion where the difference between the numerical data is small is reduced, and the line width of the portion where the difference between the numerical data is large is increased. Then, the steep portion of the biological signal waveform is emphasized thickly.

[0007]

FIG. 1 is a functional block diagram showing an embodiment of a waveform drawing apparatus according to the present invention. Hereinafter, description will be made based on this drawing.

The waveform drawing device 10 comprises a data input means 12 for inputting two numerical data x _n , x _{n +1} representing biological signals A, B at two consecutive times t _n , t _{n +1} ;
Numerical data x _n , x input by the data input means 12
_{n + 1} of the difference | x _n -x n + ₁ | and data difference calculation means 14 for calculating a difference calculated by the data difference calculation means 14 | x _n -
and a line width determining means 16 for determining the line width W _n of the biological signal waveform according to x _{n + 1} |. Waveform drawing device 1
Each means of 0 can be constituted by, for example, a microcomputer and its computer program, but can also be constituted only by hardware.

FIG. 2 is a functional block diagram showing a more specific example of the data difference calculating means 14 and the line width determining means 16 of the waveform drawing apparatus 10. FIG. 3 is a graph showing an example of the biological signal. Hereinafter, the operation of the waveform drawing apparatus 10 will be described with reference to FIGS.

Data difference calculating means 14 and line width determining means 1
6 is a counter 20, a comparator 22, and a counter control unit 2.
4.

A biological signal A (t _n ,
x _n ) is output, and the biological signal B (t _{n + 1} , x _{n + 1} ) is output at the next sampling time Δt. The numerical data x _n and x _{n + 1} are compared in magnitude by the data input means 12, and the larger one is outputted to the terminal 30 and the smaller one is outputted to the terminal 32. For example, if x _n <x _{n + 1} , the numerical data x _n is output to the terminal 32 and the numerical data x _{n + 1} is output to the terminal 30. The numerical data _xn is transferred to the counter 20, and the comparator 24 compares the output signal _xn of the counter 20 with the numerical data _{xn + 1} . In this case, since x _n <x _{n + 1} , the comparator 24 outputs the comparison result to the counter control unit 26, and the counter control unit 26 increments the data x _n in the counter 20, that is, x _n ← x _n +1.

The counter control unit 26 repeats this operation until x _n = x _{n + 1,} and according to the final increment (x _{n + 1} −x _n ), the numerical data x _n in the counter 20 ₊₁ is further adjusted (incremented or decremented) to obtain numerical data _xne . The numerical data x _ne and the biological signal A (t _n , x _n ) are output to a waveform display device (not shown), and a line width W _n starting from x _n and ending at x _ne.
Is drawn on the display screen. On the other hand, the waveform drawing device 1
The biological signal C is set to 0 at the next sampling time Δt.
(T _{n + 2} , x _{n + 2} ) are output and the numerical data x
By continuing similar processing using _{n + 1} and _{xn + 2} , a line width Wn _{+ 1} is obtained.

[0013] Figure 4 is the difference between the numerical data in the line width determining unit 16 | is a graph showing an example of the relationship between the line width _{W n | x n -x n +} 1. FIG. 5 is a graph showing an example of a biological signal waveform drawn based on the relationship of FIG. Hereinafter, description will be made with reference to FIGS.

In this example, the difference | x _n -x _{n + 1} |
a thick line width W ₀ in x ₁ or less, the difference | is a narrow line width W ₁ at a constant value [Delta] x ₁ or | x _n -x _n + _1. As a result, as shown in FIG. 5, the base line of the biological signal waveform is displayed thick.

FIG. 6 is a graph showing another example of the biological signal waveform drawn by the waveform drawing device 10. Hereinafter, description will be made based on this drawing.

In this example, contrary to the relationship shown in FIG. 4, a thin line width is used when the difference between the numerical data is less than a certain value, and a thick line width when the difference between the numerical data is more than a certain value. As a result, the gradient angle of the biological signal waveform that is equal to or larger than a certain value can be displayed thick.

[0017]

According to the waveform drawing apparatus of the present invention, the line width of the biological signal waveform is determined according to the difference between the two numerical data representing the biological signal. Can emphasize certain parts of In addition, since there is no dazzling portion, visibility can be improved. Further, the present invention can be applied to a monochrome screen.

As described above, since the highlighting can be performed by changing the gradient, it can be suitably used, for example, for displaying when an arrhythmia occurs. In addition, it is possible to suitably use the display for each patient information by changing the line width for each patient.

According to a waveform drawing apparatus according to claim 1, increase the line width of the difference is small portion of the numerical data, by reducing the line width of portions numerical difference data is large, flat of the biological signal waveform The part can be emphasized thickly.

According to the waveform drawing device of the second aspect, the line width of the portion where the difference of the numerical data is small is reduced, and the line width of the portion where the difference of the numerical data is large is increased, so that the biological signal can be obtained. The steep part of the waveform can be emphasized thickly.

[Brief description of the drawings]

FIG. 1 is a functional block diagram illustrating an embodiment of a waveform drawing apparatus according to the present invention.

FIG. 2 is a functional block diagram showing an example in which a data difference calculation unit and a line width determination unit in the waveform drawing apparatus of FIG.

FIG. 3 is a graph showing an example of a biological signal.

FIG. 4 is a diagram illustrating a line width determining unit of the waveform drawing apparatus of FIG. 1;
9 is a graph illustrating an example of a relationship between a difference in numerical data and a line width.

FIG. 5 is a graph showing an example of a biological signal waveform drawn based on the relationship of FIG.

FIG. 6 is a graph showing another example of a biological signal waveform drawn by the waveform drawing device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waveform drawing apparatus 12 Data input means 14 Data difference calculation means 16 Line width determination means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A61B 5/00 A61B 5/04 G01D 7/00

Claims (2)

(57) [Claims] 1. A waveform drawing apparatus used for a patient monitoring system for monitoring a biological phenomenon of a patient, which draws a biological signal waveform, wherein two numerical data representing a biological signal at two consecutive times at a fixed time interval. Data input means for inputting the data, a data difference calculating means for calculating a difference between the two numerical data input by the data input means, and a biological signal waveform according to a difference between the numerical data calculated by the data difference calculating means. Line width determining means for determining the line width of the numerical value data , wherein the line width determining means
When the line width is large and the difference between the numerical data is large
A waveform drawing device for a patient monitoring system , wherein the line width is determined to be small . 2. A patient monitoring system for monitoring a biological phenomenon of a patient.
Waveform drawing device for drawing biological signal waveforms
And the biological signals at two consecutive times at a fixed time interval are
Data input means for inputting two numerical data representing
The difference between the two numerical data input by the data input means
Data difference calculating means to calculate, and the data difference calculating means
Line width of the biological signal waveform according to the difference between the calculated numerical data
Line width determining means for determining the difference between the numerical data is small
When the line width is small and the difference between the numerical data is large
A waveform drawing device for a patient monitoring system , which determines the line width larger .