JPH05161617A - Portable electrocardiograph - Google Patents

Abstract

PURPOSE:To improve the operability of high-speed scroll and to shorten waiting time by providing a means to automatically switch a display magnification to a bottom magnification when a scroll key is pushed for more than prescribed time and to automatically recover the original magnification when the pushing operation is released. CONSTITUTION:When a patient moves, senses any subjective symptom such as a pain in the chest or the like and pushes an event switch 4, a CPU 26 executes the event recording of electrocardiogram data. Thus, the event recording of the electrocardiogram data before and after the pushing operation for fixed time (two minutes, for example) is executed to a RAM 36. When a user wants to speedily scroll the picture, continuously pushes a one-picture scroll key and continuous the action for more than the prescribed time, the display magnification is automatically switched to the bottom magnification and afterwards, the one-picture scroll is automatically switched to the high-speed scroll at the bottom magnification. When the pushing operation of the scroll key is released the display magnification can automatically recover the original magnification before the high-speed scroll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constantly measures electrocardiographic data of a patient and operates an event switch when the patient becomes aware of symptoms such as palpitation and chest pain. The present invention relates to a portable electrocardiograph configured to store electrocardiographic data over a period of time (event recording) and, if necessary, reproduce and display it as an electrocardiographic waveform (event waveform) during subjective symptoms.

[0002]

2. Description of the Related Art Generally, a portable electrocardiograph has a storage medium such as an IC card for storing electrocardiographic data for several minutes and is sufficient for displaying electrocardiographic waveforms for several heartbeats. It is equipped with a liquid crystal display device of the same size.

Since several heartbeats correspond to several seconds, it is necessary to scroll the displayed electrocardiographic waveform in the time axis direction in order to reproduce and display all the recorded electrocardiographic waveforms on the display screen. The waveform scroll includes "one-waveform scroll" which sequentially feeds one heartbeat, and "one-screen scroll" which sequentially feeds several heartbeats in screen units. When scrolling relatively slowly, one-waveform scrolling is performed, and when scrolling relatively fast, one-screen scrolling is performed.

A specific example of one-screen scroll will be described.

When the display magnification of the waveform is 1, the electrocardiographic waveform for 5 seconds is displayed on the display screen. Assume that the recorded electrocardiographic data spans 2 minutes. In order to display this electrocardiogram waveform from the beginning portion to the end portion by one-screen scroll, the one-screen scroll key (skip key) is continuously pressed to perform high-speed scrolling, and the display screen is × 60/5 = 24 times must be switched.

Since the response speed of liquid crystal display devices is generally slower than that of CRT displays, if the display screen is switched at an excessively high speed, afterimages will remain and the display state will be very difficult to see. This is because the switching speed of the liquid crystal screen is considerably slower than the switching speed of the electrocardiogram data.

Therefore, when the display screen is once switched by the one-screen scroll, a waiting time of several hundreds of msec is given, and then the next one-screen scroll is performed. Therefore, if the display screen is switched over 24 times, it takes a considerably long time.

In order to perform high-speed scrolling, it is recommended in the instruction manual or the like that the display magnification is once reduced by manually operating the display magnification selection key and then the single screen is scrolled.

For example, if the display magnification is switched from 1 × to 1/2 ×, the electrocardiographic waveform displayed on one screen at a time is doubled from 5 seconds to 10 seconds. The number of times the display screen is switched at this time is 2 × 60/10 = 12 times, which is half the number of times when the display magnification is 1, and high-speed scrolling is possible.

It should be noted that in order to perform high-speed scrolling, it is sufficient to continuously press and operate the one-screen scroll key, and when the high-speed scrolling to the last part of the recorded electrocardiogram waveform is completed, the display is again displayed. The display magnification is returned to the original one by manual operation of the magnification selection key.

[0011]

As described above, the instruction manual etc. explain that high-speed scrolling should be performed by operating the single-screen scroll key after switching the display magnification to a small state. If the user is not accustomed to handling the electrocardiograph, the display magnification is not switched to a small value, and one screen is scrolled at the display magnification at that time. Since the normal display magnification is 1 according to that of a general electrocardiograph, the number of times the display screen is switched is 24, and in the end, high-speed scrolling is not executed and it takes a long time to scroll the screen. there were.

In particular, when the storage capacity of the IC card, which is a storage medium, becomes large and the time for recording electrocardiographic data becomes long, the screen scrolls when the above-mentioned unfamiliar handling is performed. It will take a very long time.

For example, if an IC card capable of recording electrocardiogram data for 8 minutes is equipped, the number of times the display screen is switched is 8 when the display magnification is switched to 1/2 and then one screen is scrolled. × 60 ÷ 10
= 48 times, the high speed scroll function is fully demonstrated.

However, if one screen is scrolled while the display magnification is set to one, it is necessary to wait for the doubled screen switching 96 times. This is a significant waste of time. If one screen scroll is performed with the display magnification being twice, it is necessary to wait for 192 screen switchings, which consumes more wasted time.

If it is operated correctly according to the instruction manual, the user can get scrolling at a very high speed.
Alternatively, it is not possible to fully exercise the functions possessed by the device because it does not have sufficient knowledge of operation.

Further, even for a user who has sufficient knowledge about the operation and is accustomed to handling a portable electrocardiograph, when performing high-speed scrolling, the display magnification is first manually switched to the minimum magnification as a preparatory work. Next, the one-screen scroll key was continuously pressed, and after the scrolling was completed, the original magnification had to be returned manually, so the operability for high-speed scrolling was not very good. ..

The present invention was devised in view of the above circumstances, and even if the user is not familiar with how to handle a portable electrocardiograph, high-speed scrolling of an electrocardiographic waveform to be displayed is possible. When there is an intention to do so, it automatically detects it and automatically switches the display magnification to a small value in order to fully utilize the functions of the device, and the display magnification can be switched manually by the user. It is an object of the present invention to improve the operability by eliminating the need for and reduce the waiting time during high-speed scrolling as much as possible.

[0018]

A portable electrocardiograph according to the present invention has a storage means for storing electrocardiogram data obtained from a patient, and in the reproduction display mode, the electrocardiogram data read out from the storage means. Means equipped with a display device for displaying the electrocardiographic waveform state, capable of changing the display magnification of the electrocardiographic waveform displayed on the screen of the display device, and electrocardiographic waveform to be displayed on the screen of the display device in the time axis direction A portable electrocardiograph having a scroll key for scrolling, and means for automatically switching the display magnification to a minimum magnification based on detection that the scroll key is continuously pressed for a predetermined time or longer. After that, means for automatically returning the display magnification to the original magnification based on the detection that the pressing operation of the scroll key is released is provided. Than it is.

[0019]

The fact that the scroll key is continuously pressed for a predetermined period of time or more means that the user is trying to perform high-speed scrolling. In such a case, the display magnification is automatically switched to the lowest magnification and the scrolling is performed in that state, so that high-speed scrolling can be performed in a state where the device has the full function. Therefore, it is not necessary to force the user to have operation knowledge for high-speed scrolling. Further, when the pressing operation of the scroll key is released, the display magnification is automatically returned to the original magnification, so that the user is not confused.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a portable electrocardiograph according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the external appearance of the portable electrocardiograph according to the embodiment. This perspective view is drawn with the front part of the electrocardiograph body facing upward and the top part placed on the front side.

In the figure, A is the electrocardiograph main body, 2 is a matrix of fine liquid crystal display elements arranged vertically and horizontally, and various data such as electrocardiogram data are displayed as numerical values, graphs,
Dot-matrix liquid crystal display (LCD), which can display any of the waveforms, is operated when the patient feels subjective symptoms such as palpitation or chest pain. A large-sized event switch, 6 is a battery alarm lamp having a function of lighting for a moment when the event switch 4 is pressed, and 8 is an induction cord connection terminal for inserting and connecting an induction cord from a body surface electrode (not shown), 10 is an electrocardiogram output terminal used when the electrocardiogram data is stored, 12
Is a power key, 14 is a release key, 16 is a function key, and 18 is an operation explanation key. The liquid crystal display device 2 and various keys are arranged on the front part of the electrocardiograph main body A, and the event switch 4 is arranged on the upper surface part of the electrocardiograph main body A.

The liquid crystal display device 2 has various touch keys (see FIG. 2) arranged on its transparent touch panel. In terms of hardware, the release key 14 and the function key 16
The operation explanation key 18 is also equivalent to the touch key.

FIG. 2 is a block diagram showing the electrical construction of the main part of the portable electrocardiograph.

In the figure, 20 is a body surface electrode for picking up an electrocardiogram signal (ECG) when worn on a patient, 22 is an electrocardiographic amplifier for amplifying the electrocardiogram signal obtained by the body surface electrode 20, and 24 is an amplifier. An A / D converter that converts an analog electrocardiogram signal into digital electrocardiogram data, and 26 is a CPU (program ROM built-in type) that constitutes a central processing unit in a microcomputer and controls the entire operation and performs various processes regarding electrocardiogram data. 28 is a gate array for controlling a data bus, an address bus and peripheral circuits, 30 is a RAM which is used for loading a program and functions as a working memory, and 32 is detachably attached to the electrocardiograph main body A.
C card, 34 is a ROM for storing programs in the IC card 32, 36 is a RAM in the IC card 32,
The electrocardiogram data is temporarily stored by a memory loop method, and when the event switch 4 is pressed, the electrocardiogram data for a fixed time period (for example, 1 minute before the operation to 1 minute after the operation for a total of 2 minutes) is fixed. RAM for holding the data, 38 is a bus line, 40 is a liquid crystal driver which is controlled by the CPU 26 and sends out an electrocardiogram waveform which is display data of electrocardiogram data to the liquid crystal display device 4,
Reference numeral 2 is a touch key arranged on the transparent touch panel of the liquid crystal display device 2, and 44 is an IC card 3 for event recording.
2 is a D / A converter for externally outputting the electrocardiogram data stored in the RAM 36 to the outside, and 46 is an amplifier circuit for amplifying the analog output.

Next, the operation of the portable electrocardiograph of this embodiment will be described.

The operation mode of this portable electrocardiograph is roughly classified into a measurement mode in which a patient wears it to measure and record electrocardiogram data, and a doctor displays the electrocardiogram data recorded in the measurement mode in the liquid crystal display device 2. There is a replay mode for replay display and diagnosis. The present invention has a characteristic in the reproduction mode, but hereinafter, the measurement mode will be described first.

A doctor or the like attaches the body surface electrode 20 to the body of the patient and pushes the power key 12 to operate the CPU.
When the control operation by 26 is started, a screen for designating an operation mode is displayed on the liquid crystal display device 2. On the screen of the liquid crystal display device 2, the measurement key displayed as a part of the touch key 42 is operated. Then, the portable electrocardiograph starts measuring the electrocardiogram data.

That is, the CPU 26 controls the A / D converter 24 to sample the electrocardiogram signal picked up by the body surface electrode 20 and amplified by the electrocardiographic amplifier 22 by the A / D converter 24 at regular intervals. Convert to digital ECG data. The sampled electrocardiogram data is temporarily stored in the RAM 36 of the IC card 32 by the memory loop method.

When the patient feels subjective symptoms such as palpitation or chest pain and presses the event switch 4, the CPU 26 records an event of electrocardiogram data. That is, the memory loop method is temporarily interrupted, and among the electrocardiographic data already stored in the RAM 36, the electrocardiographic data from the time when the event switch 4 is pressed to a predetermined time (for example, 1 minute) ago is fixed. In addition to being held in the RAM 36, the electrocardiogram data from the time when the event switch 4 is pressed until a predetermined time (for example, 1 minute) has elapsed is also stored in the RAM 36.
To be fixedly held. As a result, the electrocardiogram data for a certain time (for example, 2 minutes) before and after the event switch 4 is pressed is recorded as an event in the RAM 36.

At this time, since the alarm lamp 6 is momentarily turned on in response to the pressing operation of the event switch 4, it is possible to confirm whether or not the pressing operation of the event switch 4 has been reliably performed.

When the event recording for a predetermined number of event recordings is completed, the power is automatically turned off. The maximum number of recordable events is about several times, depending on the capacity of the RAM 36.

It should be noted that the event recording may not be performed by pushing the event switch 4 by the patient himself, but the event may be automatically recorded when the arrhythmia or the like is detected by analyzing the electrocardiogram data.

Patients who have finished recording a predetermined number of events are
Bring the portable electrocardiograph to a doctor's office and give it to a doctor. The doctor presses the power key 12 to turn on the power circuit of the liquid crystal display device 2, displays a screen for designating the operation mode, and presses the play key to start the play mode. The electrocardiogram data stored in the RAM 36 of the IC card 32 is read and displayed as an event waveform on the screen of the liquid crystal display device 2 to diagnose a heart disease.

3 and 4 show the display state of the event waveform. FIG. 3 shows a display screen when the display magnification is 1. FIG. 4 shows a display screen when the display magnification is 2 times.

The right scroll key K ₁ , the left scroll key K ₂ , the right skip key K ₃ , the left skip key K _4, and the display magnification selection on the transparent touch panel in a state corresponding to the notation displayed on the display screen of the liquid crystal display device 2. Key K ₅ is arranged. Reference numeral 100 is an event waveform when the display magnification is 1 time, and 200 is an event waveform when the display magnification is 2 times, both of which are based on the time when the event switch 4 is pressed in the initial display state. Is displayed.

Event waveform 10 when the display magnification is 1
In the case of 0, a waveform for 5 seconds (about 5 heartbeats) is displayed on the display screen at one time. The event waveform 200 when the display magnification is 2 is such that the waveform for 2.5 seconds (about 2.5 heartbeats) is displayed at once on the display screen. Although not shown, the event waveform when the display magnification is 1/2 is a waveform for 10 seconds (about 10 heartbeats) is displayed on the display screen at one time.

The right scroll key K ₁ and the left scroll key K ₂ perform one-waveform scroll.
The event waveform is sequentially forwarded to the right and left by one heartbeat. Right skip key K ₃ and left skip key K ₄
One-screen scrolling is performed, and the event waveform is fast-forwarded rightward and leftward in screen units. Each key K ₁ ~K ₄ both when continues to be continuously pressed, so that the meantime continues to respective scroll operation.

Whenever the display magnification selection key K ₅ is pressed once, the display magnification is changed from 1 × → 2 × → 1/2 × → 1.
It is designed to switch cyclically as if doubled.

Now, for example, the RAM 3 of the IC card 32
It is assumed that electrocardiogram data for 8 minutes is stored in 6.
When the display magnification is 1, the right skip key K ₃
It is assumed that one screen is scrolled from the first one heartbeat to the last one heartbeat by continuously pressing.

When the display magnification is 1, it means that the waveform for 5 seconds is displayed on the display screen. Therefore, by the time the one screen scroll is completed, the display screen is displayed 8 × 60/5 = 96 times. Will have to be switched.

However, when the right skip key K ₃ is continuously operated while the display magnification is changed to 1/2, the number of times the display screen is switched until the end of the one-screen scroll is 8 ×. 60 ÷ 10 = 48 times,
It is only 1/2 that of 1 time. If the number of times the display screen is switched is halved, the time required to scroll the entire waveform by one screen will be significantly reduced (to about 1/2), and high-speed scrolling will be performed.

Continuously pressing the right skip key K ₃ or the left skip key K ₄ , which is a one-screen scroll key, is a manifestation of the desire to "scroll at high speed". Therefore, when the right skip key K ₃ or the left skip key K ₄ is continuously pressed for a predetermined time or more, it is possible to automatically switch the display magnification to the minimum magnification and then scroll one screen. The operability of high-speed scroll can be simplified.

The control operation devised in this way will be described below with reference to the flow charts shown in FIGS.

When the reproduction key is pressed to start the reproduction mode, the operation from step S1 is started.
First, in step S1, variables used in the reproduction mode are initialized.

The variable WAVE-NO is a variable representing the waveform number of the QRS group that is first displayed on the screen when displaying the event waveform.

The variable SCALE is a variable representing the display magnification when the event waveform is reproduced and displayed.

When the display magnification is 1/2, SCALE =
SCALE when set to -1 and display magnification is 1x
= 0 and the display magnification is 2x, SCALE
= 1 is set. That is, the display magnification is 1/2 times, 1 time, and 2 times SCALE -10 1.

The variable PRE-SCALE is the variable SCAL.
A variable used for the temporary store of E.

The variable KEY is a variable in which the result obtained when the CPU 26 scans the touch key 42 in the key scan routine (S3, S8) described later is set. When no key is pressed,
When KEY = 0 is set and a key is pressed, a numerical value (key number) that is predetermined according to the type of the key is set.

The variable PRE-KEY is a variable used for temporarily storing the variable KEY.

The variable KEY-MODE is a variable indicating whether the key has been pressed in a single shot or continuously. KEY-MODE = 0 is set during a single-shot operation, and KEY-MODE = 1 is set during a continuous operation. That is, there is a relationship of key operation, single-shot operation, and continuous operation, KEY-MODE 0 1.

The variable COUNTER is a variable used for counting the number of repetitions.

That is, this variable COUNTER is 1
The screen scroll key is continuously pressed for a predetermined time T _0.
It counts the number of times over.

In step S1, each of the above variables WAVE
-NO, SCALE, PRE-SCALE, KEY, P
Each of RE-KEY, KEY-MODE, and COUNTER is set to 0 and initialized.

When the initialization of each variable is completed, step S
Proceed to 2 to execute the waveform display routine. In the waveform display routine, the value of the variable WAVE-NO and the variable SCALE
And the event waveform is displayed on the screen of the liquid crystal display device 2.

As shown in FIG. 9, on the RAM 36, the electrocardiogram data is stored as a table of A / D conversion value strings and pointers indicating the head positions of the QRS groups, and the waveform numbers are stored. The electrocardiogram data are numbered sequentially from the first QRS group as 0, 1, 2, ..., Nmax.

Therefore, for example, the variable WAVE-NO
Is 0 and the value of the variable SCALE is 0, the waveform display routine displays the 0th pointer P in the QRS table.
By referring to ₀ , the A / D conversion value sequence is read in order from the A / D conversion value stored at the address indicated by the pointer P ₀ , and the liquid crystal display device 2 is displayed at the display magnification (1 ×) indicated by the variable SCALE. Display on screen.

When the processing of the waveform display routine is completed, the process proceeds to step S3, and the key scan routine is carried out to perform the key input processing. The key input process differs depending on whether the key is pressed once, once or continuously.

First, there is a case where the key is not pressed at all. In this case, the variable K is set in step S3.
It is 0 that is set in EY (KEY = 0).
Further, since the variable KEY-MODE also remains set to 0 at the time of initialization, the variable KEY- in step S4.
In the MODE determination, it is determined that KEY-MODE = 0, and the process proceeds to step S5.

In step S5, the content of the variable KEY is determined. In this case, since KEY = 0, the process returns to step S3. The reason for returning to step S3 is to prompt key input.

Next, when there is a single key operation in the key input processing, in this case, step S3
Then, the key number corresponding to the type of the key pressed and operated in the variable KEY is set in the variable KEY. Since the key operation is one shot, 0 is set in the variable KEY-MODE. Therefore, the process proceeds from step S4 to step S5, and the content of the variable KEY is determined.

The content of the variable KEY is one waveform scroll key (right scroll key K ₁ or left scroll key K ₂ ) or one screen scroll key (right skip key K ₃
If it corresponds to any one of the left skip key K ₄ ) and the end key, the process proceeds to step S6 shown in FIG. 6, but if it is any other key number, the process proceeds to step S3. Return to and repeat the key scan routine.

From step S6 to step S11,
It is a routine for determining single-shot operation / continuous operation.

In step S6, the contents of the variable KEY are temporarily stored in the variable PRE-KEY. In step S7, a predetermined time T ₀ (for example, 500 msec)
Idling (waiting for time) is performed, and then the key scan routine is executed again in step S8. Here, the key number corresponding to the type of the entered key is set to the variable K.
Set to EY.

Then, in step S9, the variable PRE-K
It is determined whether the contents of EY and the contents of variable KEY are the same.

When the key number set in the variable KEY in step S3 is the same as the key number set in the variable KEY in step S8, that is, when the same key is continuously pressed for a predetermined time T _0. In the PR
E-KEY = KEY, and in this case, step S1
Go to 0 and assume that the key input is continuous, the variable KEY-
Set 1 to MODE (KEY-MODE = 1).

Unlike the above, in step S3 the variable KE
The key number set in Y and the variable KEY in step S8
If the key number set in the key is different, that is, if another key is input before the predetermined time T ₀ has elapsed, PRE-KEY ≠ KEY, and in this case,
Proceeding to step S11, assuming that it is a single key input,
Set 0 to the variable KEY-MODE (KEY-MO
DE = 0).

In step S12 following step S10 or step S11, the content of the variable KEY is determined again. When the key number indicated by the content of the variable KEY corresponds to the end key, the processing in the reproduction mode is processed.

If the key number indicated by the contents of the variable KEY is neither the one-waveform scroll key (K ₁ , K ₂ ) nor the one-screen scroll key (K ₃ , K ₄ ), step S 1
Go to 3 and initialize the variable KEY-MODE again to 0
After that, the process returns to the key scan routine of the first step in step S3.

In the determination of step S12, the variable KE
The key number indicated by the contents of Y is one waveform scroll key (K ₁ , K ₂ ) or one screen scroll key (K ₃ ,
If it is K ₄ ), the routine proceeds to step S14, where a waveform number increasing / decreasing routine is executed.

That is, the variable WAVE-NO indicating the waveform number is increased / decreased depending on whether it is the one-waveform scroll key or the one-screen scroll key, or the rightward key or the leftward key. Next, returning to step S2, the waveform display routine is executed again.

Then, in step S3, a key input is awaited again.

As described above, the routine from step S2 to step S14 is repeated many times. In the determination of the contents of the variable KEY-MODE in step S4, KEY-MODE = 1 and the continuous key is used. When it is determined that there is an input, steps S2 to S14
The routine exits from step S15 and shifts to step S15 shown in FIG.

At this time, what is set in the variable KEY is the key number corresponding to the current key, which is assumed to be continuously pressed, and what is set in the variable PRE-KEY is continuously. It is the key number corresponding to the previous key that is being pressed.

Steps S15 to S shown in FIG.
22 is a routine for processing the continuous key input state.

First, in step S15, it is determined whether or not the content of the variable KEY is reset to 0. This is to confirm whether or not the pressing operation on the keys that have been continuously pressed is still continuing.
When the pushing operation is released, the process proceeds to step S23 and subsequent steps shown in FIG. 8 (described later).

If the variable KEY has not been reset to 0, the process proceeds to step S16, and it is determined whether the contents of the variable PRE-KEY and the variable KEY still match. That is, when another key input is made, it is determined that the continuous key input has been canceled, and the process proceeds to step S23 and thereafter, but when PRE-KEY = KEY and the continuous key input state is still continued. , And proceeds to step S17.

In step S17, the content of the variable KEY is determined again. The key number indicated by the contents of the variable KEY is 1
If it is other than the screen scroll key, the process returns to step S12, but if it is the one screen scroll key,
It proceeds to step S18.

The one-screen scroll key is pressed for a predetermined time T ₀ (5
When the process proceeds to step S18 on the assumption that the continuous pushing operation is performed for 00 msec), the variable C counting the number of times the continuous pushing operation exceeds the predetermined time T _0.
Check the contents of OWNER. In this check, the predetermined number N when the display magnification is forcibly shifted to the minimum magnification is the criterion.

If the content of the variable COUNTER has not reached the predetermined number N, the process proceeds to step S19 in order to maintain the original magnification without changing the display magnification, and the variable SCAL.
E is temporarily stored in the variable PRE-SCALE. Then, the process proceeds to step S22 and the variable COUNT
Increment ER. That is, the number of times the continuous pressing operation of the one-screen scroll key exceeds the predetermined time T ₀ is increased by one.

Then, the process returns to step S12.

Now, steps S20 and S2 described below
1 is an operation which is the point of the present invention.

The process returns from step S19 to step S22 to step S12, but as long as the one-screen scroll key is continuously pressed,
12 → S14 → S2-S4 → S15-S18 → S19 →
Repeat with S22. By repeating this, the variable COU
The content of NTER will eventually reach the predetermined number N. That is, the number of times the continuous pressing operation of the one-screen scroll key exceeds the predetermined time T ₀ reaches the predetermined number N.
Then, the process proceeds from step S18 to step S20.

In step S20, as in step S19, the variable SCALE is temporarily stored in the variable PRE-SCALE, and the original display magnification is stored.
In step S21, a variable SCA that specifies the display magnification
Set LE to -1, and set the display magnification to 1/2 of the minimum magnification.
Forced to double the shift.

Indeed, by the processing of step S21, the subsequent one-screen scroll is automatically switched to the high-speed scroll at the minimum magnification.

In other words, if the user wants to scroll the screen quickly and continues to press the one-screen scroll key (the right skip key K ₃ or the left skip key K ₄ ) continuously, if When the display magnification is 1 or 2, the screen scrolls relatively slowly no matter how many continuous push operations are performed. The display magnification is automatically switched to the minimum magnification (1/2 times) while continuing for more than a time, and is actually switched to the high-speed scroll state.

After that, the content of the variable COUNTER is incremented to (N + 1), but at that time, the process skips from step S18 to steps S20 to S22 and skips to step S12.
The content of NTER remains (N + 1).

When the portion of the event waveform that the user desires to see appears on the display screen after the number of times the continuous pressing operation of the single screen scroll key exceeds the predetermined time T ₀ reaches the predetermined number N, the single screen scroll key The continuous pushing operation of will be released. At this time, the process exits from step S15 to step S23 shown in FIG. In addition, even if the portion of the event waveform desired to be seen before the number of times the continuous pressing operation of the single screen scroll key exceeds the predetermined time T ₀ does not reach the predetermined number N appears on the display screen, the single screen scroll key Cancel the continuous pressing operation of. Also at this time, step S1
The process exits from step 5 to step S23. Furthermore, if another key is pressed while holding down the one-screen scroll key and the pressing operation of the one-screen scroll key is released in that state, the process exits from step S16 to step S23. Step S
After 23, the display magnification is returned to the original state.

In step S23 shown in FIG. 8, the variable PR
Determine the contents of E-KEY. If it is not the key number corresponding to the one-screen scroll key, step S26.
However, if the key number corresponds to the one-screen scroll key, the process proceeds to step S24. Step S
At 24, the contents of the variable COUNTER are checked.
If the value is not (N + 1), the process skips to step S26, but when COUNTER = N + 1, that is,
If the variable SCALE is once set to -1 in step S21 to set the display magnification to the minimum magnification, step S2
Go to step 5 and set the contents of the variable PRE-SCALE to the variable SCA.
Transfer to LE and restore the original display magnification from the lowest magnification.

In step S26, this step S26
Whether the previous step that has come to S23, S24, or S25 is that the continuous pressing operation of the one-screen scroll key has been canceled, so that the variable KEY-MODE and the variable COUNTER are cleared and set to 0. Then, the process returns to the key scan routine of step S3.

[0092]

As described above, according to the present invention, the display magnification is automatically switched to the minimum magnification by continuously pressing the scroll key for a predetermined time or longer. Even if you are not familiar with it, if you continue to press the scroll key with the intention of high-speed scrolling, you can automatically shift to the high-speed scrolling state. Further, when the pressing of the scroll key is released, the display magnification can be automatically returned to the magnification before the high speed scroll. Therefore,
The operability of high-speed scroll can be improved, and the time to wait during high-speed scroll can be shortened as much as possible.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a portable electrocardiograph according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the portable electrocardiograph according to the embodiment.

FIG. 3 is a display example of an event waveform when the display magnification is 1 in the embodiment.

FIG. 4 is a display example of an event waveform when the display magnification is 2 times in the embodiment.

FIG. 5 is a flowchart for explaining the operation of the embodiment.

FIG. 6 is a flowchart for explaining the operation of the embodiment.

FIG. 7 is a flowchart for explaining the operation of the embodiment.

FIG. 8 is a flowchart for explaining the operation of the embodiment.

FIG. 9 is a diagram showing a relationship between electrocardiogram data and a memory map in the example.

[Explanation of symbols]

2 Liquid crystal display device 4 Event switch 12 Power key 20 Body surface electrode 26 CPU 32 IC card 36 IC card RAM 42 Touch key 100 Event waveform when the display magnification is 1 × 200 Event waveform when the display magnification is 2 × ₁ Right scroll key (1 waveform scroll key) K ₂ Left scroll key (1 waveform scroll key) K ₃ Right skip key (1 screen scroll key) K ₄ Left skip key (1 screen scroll key) K ₅ Display magnification selection key

Claims (1)

[Claims] 1. A display device, comprising: a storage unit for storing electrocardiogram data obtained from a patient; and a display device for displaying the electrocardiogram data read out from the storage unit in a reproduction display mode in an electrocardiographic waveform state. A portable electrocardiograph comprising means for changing the display magnification of an electrocardiographic waveform displayed on the screen of a display device and scroll keys for scrolling the electrocardiographic waveform to be displayed on the screen of the display device in the time axis direction. A means for automatically switching the display magnification to the minimum magnification based on the detection that the scroll key is continuously pressed for a predetermined time or more, and thereafter, the pressing operation of the scroll key is canceled. A portable electrocardiograph, comprising: means for automatically returning the display magnification to the original magnification based on detection.