TW201414453A - Method and device for dynamically acquiring ECG signal - Google Patents

Abstract

This invention discloses a method and a device for dynamically acquiring ECG signal. The device comprises an ECG signal acquisition circuit; a static unit carrying a second electrode connected to the ECG signal acquisition circuit; and a dynamic unit having a first electrode connected to the ECG signal acquisition circuit and a non-electrode part. When performing ECG signal acquisition, the static unit is fixed to a part of the body of a subject to make the second electrode contact the skin, and the non-electrode part of the dynamic unit is held by an operator to make the first electrode contact the skin of another part of the subject's body. Afterwards, an ECG signal acquisition process is executed to obtain the ECG signal of the subject with a projection angle between two points of the first electrode and the second electrode. Furthermore, the obtained ECG signal or other related ECG messages are instantly displayed on an external device.

Description

Dynamic ECG signal acquisition method and device

The present invention relates to a dynamic electrocardiographic signal acquisition device, and more particularly to an electrocardiographic signal acquisition device that can obtain a multi-angle electrocardiogram by instantaneous movement.

The traditional 12-lead (12-Lead) ECG detection system is one of the most commonly used systems for hospitals to obtain more complete cardiac information. As shown in Figure 1, in order to perform 12-lead ECG detection, it is necessary to Ten electrodes are attached to the patient's body. Through the loop formed between the two electrodes, 12 sets of output signals are obtained, and each set of leads represents a change in cardiac current at different angles.

Generally, when performing 12-lead ECG detection, since the number of electrodes is large and needs to be positioned, the setting of the electrodes is usually performed by the medical staff, after which all the electrodes are connected to the same machine, and the signals are taken by the electrocardiograph. Printed on paper to provide a physician to determine the patient's heart condition.

From the above, it can be seen that under the current equipment and technology, the 12-lead ECG test is indeed a rather time-consuming operation for patients or hospitals. In addition, since it is necessary to install 10 electrodes at the same time, Usually, the electrocardiogram is printed through the tracing device. Therefore, this is also a negligible expenditure for the hospital. In addition, the physician observes the electrocardiogram more than after the detection is completed. Therefore, it is not easy to immediately find the detection problem, for example, The position of the electrodes is not ideal, or the lead needs to be increased to further understand the condition of the heart. For example, the location of some myocardial infarctions is not clearly visible by the 12-lead.

As is well known, electrocardiography is the best way to measure and diagnose abnormal heart rhythms, which can diagnose heart rhythm abnormalities in cardiac electrical tissue damage and changes in heart rhythm due to imbalance of electrolyte balance, especially in myocardial infarction. In the diagnosis, the electrocardiogram can specifically distinguish the area of myocardial infarction. However, when the location of myocardial infarction is rather special, the standard 12-lead ECG may not be able to clearly distinguish its position, which requires an extended lead, which includes an rV ₄ lead (in conjunction with the standard 12 lead). The V ₄ lead is symmetric about the median line, on the right chest wall, and the V ₇ , V ₈ , V ₉ leads on the left chest wall.

Therefore, if the doctor can immediately adjust the position of the electrode according to the measured electrocardiogram at the time of the visit, to obtain the electrocardiogram of the desired orientation, the patient and the medical staff can save time and become more efficient. The way to get the desired ECG signal is also available to the physician in a more convenient way.

Furthermore, each patient's physiological condition is different. When using the same conditions for measurement, it is not obvious that everyone can obtain a good ECG signal suitable for interpretation. It is often necessary to make individual adjustments during the test to get the best ECG. It is also possible to provide the physician with the best judgment basis.

Therefore, if the doctor can immediately understand the acquired ECG signal during the visit, the test conditions, such as sampling rate and gain, can be adjusted in time according to the actual signal waveform, thereby ensuring the required compliance. The ECG signal, I believe that the judgment of the condition will be more helpful.

Therefore, the object of the present invention is to provide a dynamic electrocardiographic signal acquisition device, which can adjust the position of the electrode in time according to the detection, thereby obtaining an electrocardiogram more suitable for actual needs.

Another object of the present invention is to provide a dynamic electrocardiographic signal acquisition device that allows an operator to adjust the sampling conditions in real time according to actual needs to obtain an ECG signal that is most suitable for interpretation.

According to an aspect of the present invention, a dynamic ECG signal acquisition method includes: providing an ECG signal acquisition device, including a dynamic unit having a first electrode and a non-electrode portion, and a static unit carrying a first a second electrode, the static unit is fixed to a part of a body of the subject to contact the second electrode, and the first electrode contacts the body of the subject by an operator holding the non-electrode portion of the dynamic unit The other part performs a single-hearted signal acquisition process to obtain an ECG signal of the subject's projection angle between the first electrode and the second electrode, and an instant display of the external device ECG or other ECG related messages.

According to the above, the execution of the ECG acquisition program can be controlled by detecting a physical change caused by the contact of the dynamic unit with the skin. For example, Contacting the sensing element, a pressure sensing element, or a switching element to obtain a physical change of each element when the dynamic unit is in contact with the body, thereby controlling the execution of the ECG signal, or The signal change of the circuit where the first electrode is located can also be detected. For example, a current is applied to obtain the impedance and capacitance change in the circuit, and the contact between the skin and the skin of the testee is known, thereby controlling the heart. Telecommunications acquisition program.

In addition, a switch may be disposed on the non-electrode portion to allow the operator to control the ECG signal capture by the switch when the dynamic unit is held, wherein, in particular, the switch may be located at the first electrode The position at which the contact person touches the contact person also occurs, so that the operation can be completed at the same time. Alternatively, the switch can also be disposed on the static unit or the external device. Here, it is advantageous that Provides user switching options between automatic control and manual operation.

In addition, the external device can perform an analysis procedure on the ECG signal by loading an analysis formula, thereby obtaining more ECG related information for the physician to perform an immediate interpretation, where the external device It can be a personal computer, a notebook computer, a tablet computer, a smart phone, and a device with a display function such as a PDA, and the external transmission can be implemented as wired or wireless transmission.

According to another aspect of the present invention, a dynamic electrocardiographic signal acquisition device includes: an ECG signal acquisition circuit, a static unit carrying a second electrode connected to the ECG acquisition circuit, and a dynamic a unit having a first electrode connected to the electrocardiographic signal extraction circuit and a non-electrode portion, wherein the non-electrode portion is configured to be hand-held to facilitate contact of the first electrode by moving the dynamic unit a portion of a user's body, and the static unit is configured to be fixed to another portion of the user's body to contact the second electrode, and to simultaneously contact the first electrode and the second electrode The user's body can obtain an ECG signal or other ECG related information of the user's projection angle between the first electrode and the second electrode, and display it to an external device.

According to the above, the ECG signal capture circuit can be disposed in a housing to connect the dynamic unit and the static unit, or alternatively, can be disposed in the dynamic unit, or the static unit, or There is no particular limitation on the external device. In addition, a signal processing circuit may be further included in the dynamic unit to perform related processing when the signal is acquired to reduce the occurrence of noise.

Furthermore, in order to make the non-electrode portion of the dynamic unit suitable for hand-held, it can be implemented in a cylindrical shape, a stethoscope shape or the like for the physician to hold and contact the patient, and also in this form, the dynamic unit can also include a stethoscope. a module to achieve the function of a stethoscope while in contact with the body, for example, to obtain a heart sound or a lung sound, and more particularly, the dynamic unit can also be implemented to be integrated with the external device to provide a hand-held operation It is also possible to read the ECG signal.

Preferably, the type, the number, and the like of the first electrode and the second electrode may be changed according to actual needs, and more advantageously, implemented in a replaceable form to further improve the usability. In addition, it is also advantageous that the number of the dynamic unit and the static unit can also be single or plural without any limitation.

Therefore, the dynamic electrocardiographic signal acquisition device of the present invention provides different electrocardiographic signal acquisition modes by setting the dynamic unit, and moves the first electrode thereon by holding the non-electrode portion of the dynamic unit. To contact different parts of the body according to the requirements, and then to the second electrode on the static unit, in the case where a large number of electrodes are not required, a multi-angle electrocardiogram can be obtained, and by the setting of the non-electrode portion It also allows the physician to carry out the patient's ECG signal capture by holding the dynamic unit, and provides both the patient's own operation and the physician's operation, further increasing the convenience of use, and using the instant display method. Physicians can instantly see the ECG and related information, and instantly adjust the conditions of the signal acquisition, and can also diagnose the symptoms more quickly.

The present invention will be fully understood by the following examples, which can be accomplished by those skilled in the art, and the implementation of the present invention is not limited by the following examples.

Please refer to FIG. 2, which shows a circuit diagram of a dynamic electrocardiographic signal acquisition device according to the present invention, and FIG. 3, which shows an operation diagram of the dynamic electrocardiographic signal acquisition device according to the present invention, wherein, for example, As shown, a dynamic electrocardiographic signal acquisition device according to the present invention includes an ECG signal acquisition circuit 100, a dynamic unit 200, and a static unit 300, wherein the dynamic unit 200 carries a first electrode 202, and The static unit 300 carries a second electrode 302 and is respectively connected to the ECG signal extraction circuit 100. The first electrode 202 and the second electrode 302 simultaneously contact the same user to obtain the ECG signal of the user.

In this architecture, the static unit 300 is implemented to be fixed to the user, for example, a limb, a body, or other body part, while the ECG signal is being taken, and the dynamic unit 200 is provided according to requirements. The function of changing the sampling position.

In order to achieve a movable function, the surface of the dynamic unit 200 is constructed to have a non-electrode portion 204 on the surface (see FIG. 5), and the non-electrode portion 204, in addition to the first electrode 202. The purpose of the setting is to provide the user to hold the dynamic unit 200 without touching the first electrode 202, and then move to avoid affecting the signal extraction. Therefore, preferably, the non-electrode portion 204 further It is constructed to have a hand-held and ergonomic structure.

Here, in particular, through such a structural design, the present invention provides a novel detection method by which a doctor can hold the dynamic unit 200 and perform electrocardiographic detection for a patient. As shown in FIG. 3, in the case of using the dynamic electrocardiographic signal acquisition device provided by the present invention, since the dynamic unit 200 provides the non-electrode portion 204 as a hand-held, when the static unit 300 is fixed After being placed on the subject, the physician can manually move the first electrode 202 to the desired position by touching the dynamic unit 200 and determining the angle of the electrocardiogram desired to be obtained, and contacting the subject. The body, in this way, can be obtained without being limited to the set electrode position, and indeed obtain the electrocardiogram of the true desired angle.

Furthermore, according to the present invention, after the ECG signal is obtained, it is immediately displayed by an external device 400, and the display of the external device 400 allows the physician to immediately know the measured ECG signal and pass through it. In such a way, it is understood whether such a sampling angle is appropriate, whether it is necessary to adjust the position, and whether an electrocardiogram or the like of other angles is required, that is, the dynamic electrocardiographic signal extraction device provided by the present invention provides the physician with the current consultation with the patient. A novel way to instantly adjust and detect, instead of seeing a previously detected ECG, it is found to be insufficient or incorrect, and the patient needs to perform an ECG test to obtain the actual ECG, and The display of the external device 400 allows the physician to immediately know the electrocardiogram waveform of each patient, for example, the amplitude, and know whether there is difficulty in interpretation, so that it can be adjusted immediately for each patient's actual situation. Parameters such as sampling rate, gain, etc., make waveform observation easier, which saves patient time, saves medical resources, and allows physicians to make judgments more quickly.

In addition, if it is necessary to change the position of the reference point, for example, from the left hand to the left foot, the physician can instantly change the fixed position of the static unit 300, and resample the angle electrocardiogram by performing the movement of the dynamic unit 200. The detection procedure, in this way, makes it easy and quick to obtain a multi-angle electrocardiogram with another position as a sampling reference point.

Furthermore, the external device 400 can provide other relevant information for the measured single waveform in addition to the displayed functions, so that the entire detection process is more convenient, for example, by loading the analysis calculus, Various ECG related values such as heart rate, ST value, QRS, PR, QTc, and automatic detection of arrhythmia can be provided immediately.

For example, the external device 400 can display a screen as shown in FIG. 4, which includes an instantaneously acquired electrocardiographic waveform, a display area that can be partially enlarged and reduced, and various related numerical values, a display area of the information, and the like. Through such an instant display mode, the physician can immediately know the current ECG obtained from the contact point, and then, by moving the dynamic unit 200 to another contact point, the corresponding other telecard can be conveniently obtained. No. Further, the external device 400 can also provide a storage function. For example, when the physician sees the ECG signal of each contact point, the physician can choose whether or not to store the signal, so when multiple points After the detection of the contact is over, all measured ECG waveforms can be displayed together, so that the physician can still see the electrocardiogram of multiple leads at the same time, and can make a comprehensive judgment.

In addition, the ECG signal capture circuit can also load an analysis formula, that is, before the transmission to the external device 400, the relevant calculation has been completed, as described above, heart rate, ST value, DRS, PR , QTc, arrhythmia auto-detection, etc., but only by the external device 400 for display, or alternatively, the analytical calculus in the ECG signal acquisition circuit only provides partial, basic analysis The function is to be transmitted to the external device 400 for a more complete analysis, and therefore, there is no limitation, and it may vary depending on actual needs.

Here, due to the design of the non-electrode portion 204 of the dynamic unit 200 of the present invention, the patient can also hold the dynamic unit 200 by himself without affecting the signal acquisition, for example, when the physician searches for and moves to the desired position. Ask the patient to hold it for the doctor to do Waveform observation, recording, etc., or the physician can directly ask the patient to move the position of the dynamic unit 200 according to the instructions, so that all aspects of the demand can be satisfied.

Moreover, an advantage provided by the design of the non-electrode portion 204 is that when the patient holds the hand, the first electrode 202 is not held by the hand holding the dynamic unit 200 due to the electrode contact. The other parts of the body that are in contact, plus the static unit 300, are fixed. Therefore, it is not easy for the patient to manually generate the signal to capture the electromyographic interference of the electrocardiogram, and further determine the signal obtained. Sharpness.

Here, the external device 400 can be a personal computer, a notebook computer, a tablet computer, a smart phone, a PDA and the like, and the connection between the device and the ECG signal capture device can be Implemented as a wireless, or wired connection, without any restrictions, depending on actual needs.

Since the present invention provides a way for the physician to immediately assist the patient in detecting and instantly moving the electrode to set the position, the dynamic unit 200 can further provide a design that makes the user's hand-held operation more convenient and smoother.

According to a preferred embodiment, the dynamic unit 200 can have a detection mechanism, for example, directly disposed on the first electrode 202, so that the ECG signal acquisition program can contact the first electrode 202 to be tested. The body begins to perform at the same time. For example, the contact situation can be known by detecting a physical change caused by the contact between the electrode and the skin. For example, a contact sensing element can be provided, which can be provided by its own circuit. Changes in characteristics, such as capacitance, resistance change, and contact between the reaction electrode and the skin, or a pressure sensing element that senses a change in force on the electrode, or a switching element that determines that the electrode is subjected to Whether the applied force reaches a certain intensity, for example, whether it causes deformation, or alternatively, by sending a signal, a constant current or a constant voltage, detecting a change in circuit characteristics of the loop in which the first electrode 202 is located, For example, changes in impedance and capacitance, and thus the contact between the electrode and the skin of the subject, so that as long as the preset condition range is reached, for example, the contact area is sufficient, If the contact force is enough, the ECG signal acquisition program can be directly executed, which not only has convenience, but also can effectively save operation time. Here, it should be noted that the physical change is not limited to where it occurs, and may be set. The physical change of the component itself on the first electrode 202 may also be a change in the circuit characteristics of the loop in which the first electrode 202 is located, There are any restrictions.

In addition, according to a further preferred embodiment, a switch can be disposed on the dynamic unit 200 to provide a user with a manual control of the selection of the ECG acquisition program. In particular, the switch can be directly disposed in the dynamic unit. 200, when the measurement is made on the contact surface with the skin of the subject, so that no special manual switch is required, but the opening procedure can be completed in the same action of contacting the electrode. According to still another preferred embodiment, The user is provided to switch to the ECG signal acquisition program by a detection mechanism or manually. Alternatively, the switch may be disposed on the external device 400 or the static unit 300 without limitation.

According to a further preferred embodiment of the present invention, the dynamic unit 200 can also include an operation interface. As shown in FIG. 5D, the user can perform some simple operations directly while holding the hand, for example, a button. 206, display component 208, etc., for example, the user can adjust the sampling rate, gain by button, or choose whether to store the ECG at this location, or mark the current sampling position, such as, V1, V2.. .V6, etc., and the user can immediately know the result of adjustment and selection by displaying the component, so that the convenience of the handheld operation can be further improved.

With the design of the dynamic unit 200 of the present invention, it becomes feasible for the physician to hold the dynamic unit 200 to achieve electrode contact on the patient, and the operation of the present invention also makes the present invention suitable for the dynamic unit 200. Adding other detection modules to complete other detection behaviors while achieving electrode contact. For example, a stethoscope module may be added to the dynamic unit 200 to allow the physician to obtain the ECG signal in the same operational behavior. At the same time, other physiological information, such as heart sounds or lung sounds, can also be obtained. In this case, it is more advantageous to allow the user to select only the ECG signal capture or the stethoscope function at the same time by switching. Or use only the stethoscope function, there is no limit.

In order to facilitate the hand-held operation, the implementation of the dynamic unit 200 may vary, as shown in Figures 5A-5D, may be a cylindrical shape (Fig. 5A and 5B), or as a stethoscope The shape (Fig. 5C and Fig. 5D) is feasible as long as it is suitable for hand-held and at the same time a shape that contacts the body surface, in particular, according to a preferred embodiment, the dynamic unit 200 can also be implemented to be external to the exterior The device 400 is combined to become a whole The body, for example, is originally suitable for handheld devices, such as smart phones, PDAs, etc., so that the user can select the desired design according to actual needs.

In addition, the static unit 300 can also have different structural designs, and cooperate with different types of second electrodes 302 to provide various fixing methods for the user, for example, through replacement, to increase selectivity and improve ease of use. The type of the second electrode 302 may include, but is not limited to, a medium that needs to be used, for example, a patch electrode, a cup electrode, etc., and a person who does not need to use a medium, for example, a suction electrode. , dry electrode, clip-on electrode (Fig. 6A and Fig. 6B), and in particular, a special shaped electrode formed according to such an operation type, for example, a grippable rod electrode made of a conductive material ( Fig. 6C), or a plate-form electrode (Fig. 6D), etc., without any limitation. In addition, it may be a special electrode, for example, an electrode integrated with a circuit, for example, a non-contact electrode designed by a potential signal sensing principle and capable of detecting through a clothing, and can be improved. Active electrode circuit with anti-noise capability.

Similarly, the first electrode 202 on the dynamic unit 200 can also have different options. As described above, it can be a suction ball electrode, a dry electrode, a non-contact electrode circuit, an active electrode circuit, etc., or The electrode to be fabricated is applicable as long as it is an electrode type suitable for the operation type of the dynamic unit 200.

In addition, the first electrode 202 or the second electrode 302 is not limited in number, and may be single or plural, and may also be implemented in a replaceable form to provide use. In addition, the number of the dynamic unit 200 and the static unit 300 can also be more than one, and therefore, there is no limitation. In addition, in particular, the dynamic unit 200 and/or Or one or more ground (GND) electrodes are added to the static unit 300, which helps to suppress noise and obtain a clearer ECG signal.

In the physical configuration, the ECG acquisition circuit can be directly disposed in the dynamic unit 200 and/or the static unit, and the static unit 300 is connected to the dynamic unit 200 through a connection line, and then transmits the wireless unit. (as shown in FIG. 7) or a wired transmission interface (as shown in FIG. 3) to communicate with the external device 400, or alternatively, the ECG signal extraction circuit can be disposed in another housing, And let the dynamic unit 200 and the static unit 300 Electrically connected thereto, for example, the two are directly connected to the housing by a connecting line, or the static unit 300 is first connected to the dynamic unit 200, and then connected to the housing by the dynamic unit 200, or alternatively The ECG signal capture circuit can also be disposed in the external device 400, and thus, there is no limitation.

In this case, in particular, the signal processing circuit can be additionally provided in the dynamic unit 200 or the static unit 300, that is, the processing is performed after the ECG signal is acquired, for example, analog digital conversion (A/D conversion). ) to reduce the noise generated by the signal transmitted over long distances.

Due to the high adaptability of the architecture of the present invention, it is also possible to use it in conjunction with conventional electrocardiographic testing devices. For example, a 12-lead electrode can be placed on the patient and connected to the electrocardiogram. In the case of a receiving device, the electrocardiographic signal capturing device of the present invention is additionally used to increase the applicability of the twelve-lead ECG detection.

In addition, due to the high mobility of the ECG signal capture device of the present invention, it is only necessary to cooperate with a portable external device that is convenient to use, for example, a smart phone, a tablet computer, etc., to provide a physician with a heart outside the hospital. Electrical testing, or for ECG testing in doctors' patrols or on ambulances, can replace the traditional need for large machines and the placement of numerous electrodes with numerous connections, in a lighter, simpler way. Get an ECG signal.

In summary, by using an innovatively designed dynamic unit, the dynamic electrocardiographic signal acquisition device according to the present invention provides different ECG signal acquisition modes by moving the first electrode disposed on the dynamic unit, respectively Contacting different parts of the body, and then matching the second electrode on the static unit, therefore, in the case where a large number of electrodes are not required, the device according to the present invention can obtain a multi-angle electrocardiogram to compensate for the general 12-lead electrocardiogram Since the electrode setting position is fixed and cannot cover all the ECG angles, some symptoms may be missed, and the immediate display of the electrocardiogram can be immediately performed by the external device display, so that the conditions of the signal acquisition can be adjusted instantly. For example, sampling rate, gain, etc., do not need to print out the ECG, but also save the trouble that patients may need to re-test, not only save time, save hospital resources, and more importantly, can diagnose symptoms more quickly, and then The electrocardiographic signal acquisition of the present invention is due to the arrangement of the non-electrode portion on the dynamic unit. You can obtain the patient's ECG signal in hand-held operating physician to provide patient operated without use, but also further increase the ease of use.

The present invention has been described in detail by the above-described embodiments, and may be modified by those skilled in the art, without departing from the scope of the appended claims.

100‧‧‧ ECG signal capture circuit

200‧‧‧dynamic unit

202‧‧‧First electrode

204‧‧‧Non-electrode part

206‧‧‧ button

208‧‧‧ display components

300‧‧‧Static unit

302‧‧‧second electrode

400‧‧‧External devices

1 is a schematic view showing an electrode configuration of a conventional 12-lead ECG detecting system; FIG. 2 is a circuit diagram of a dynamic electrocardiographic signal extracting device according to the present invention; FIG. 3 is a view of the present invention A preferred embodiment of the dynamic ECG signal capture device; FIG. 4 is a schematic diagram of a software screen for displaying ECG signals and ECG related messages according to a preferred embodiment of the present invention; 5A-5D drawings: an exemplary schematic diagram of a dynamic unit in accordance with a preferred embodiment of the present invention; FIGS. 6A-6D: an exemplary schematic diagram of a static unit in accordance with a preferred embodiment of the present invention; and FIG. It is a schematic diagram of the dynamic ECG signal acquisition device communicating with an external device according to a preferred embodiment of the present invention.

100‧‧‧ ECG signal capture circuit

202‧‧‧First electrode

302‧‧‧second electrode

Claims (18)

A method for extracting a dynamic electrocardiogram signal, comprising the steps of: providing an ECG signal acquisition device, comprising: a dynamic unit having a first electrode and a non-electrode portion, and a static unit having a second electrode; The static unit is fixed to a part of the body of the subject to contact the second electrode; the first electrode is contacted with the other part of the body of the subject by an operator holding the non-electrode portion of the dynamic unit Performing a heart-to-heart signal acquisition procedure to obtain an ECG signal of a projection angle of the subject between the first electrode and the second electrode; and instantly displaying the obtained ECG signal on an external device Or other ECG related messages. The method of claim 1, further comprising the step of detecting a physical change caused by the contact of the dynamic unit with the subject, thereby controlling execution of the ECG acquisition program. The method of claim 2, wherein the physical change is one or more of the following: a change in circuit characteristics of a contact sensing element, a change in force of a pressure sensing element, and a switching element The deformation, and a circuit characteristic of the loop in which the first electrode is located, changes. The method of claim 1, wherein the operator is the same person as the subject. A dynamic electrocardiographic signal acquisition device includes: a cardiac signal acquisition circuit; a dynamic unit having a first electrode connected to the ECG acquisition circuit, and a non-electrode portion, a static unit having a a second electrode coupled to the ECG capture circuit; and wherein the non-electrode portion is configured to be hand-held to facilitate contact of the first electrode with a portion of a user's body by moving the dynamic unit, and The static unit is configured to be fixed to another portion of the user's body to contact the second electrode; and the first electrode and the second electrode are simultaneously contacted with the user's body to obtain the user An ECG signal or other ECG-related information at a projection angle between the first electrode and the second electrode is immediately displayed on an external device. The device of claim 5, further comprising a housing for housing the electrocardiographic signal extraction circuit therein. The device of claim 6, wherein the dynamic unit and the static unit are respectively connected to the housing through a connecting line. The device of claim 6, wherein the dynamic unit is connected to the housing through a connecting line, and the static unit is connected to the dynamic unit through a connecting line. The device of claim 5, wherein the ECG signal capture circuit is located in the dynamic unit or the static unit, and the dynamic unit and the static unit are connected to each other through a connection line. The device of claim 5, wherein the electrocardiographic signal acquisition circuit is located in the dynamic unit, the static unit, or the external device. The device of claim 5, wherein the dynamic ECG signal capture device is in wireless communication or wired connection with the external device. The device of claim 5, further comprising an operation interface, located in the dynamic unit, the static unit, or the external device, for the user to perform operations such as startup, parameter selection, storage, and the like. The device of claim 5, wherein the external device is a personal computer, a notebook computer, a tablet computer, a smart phone, or a PDA. The device of claim 5, wherein the first electrode is one or more of the following groups, including: a suction electrode, a dry electrode, and an electrode circuit integrated with the circuit. The device of claim 5, wherein the second electrode is one or more of the following groups, including: a patch electrode, a cup electrode, a suction ball electrode, a dry electrode, Clip-on electrodes, rod electrodes made of conductive material, flat-plate electrodes, and electrode circuits integrated with circuits. The device of claim 5, wherein the first electrode and the second electrode are respectively replaceable. The device of claim 5, further comprising a stethoscope module disposed in the dynamic unit to provide an auscultation function when the first electrode contacts the user's body. A dynamic unit as claimed in any one of claims 5-17.