CN112450940A - Electrocardio detection device, chip, method and wearable electronic equipment - Google Patents
Electrocardio detection device, chip, method and wearable electronic equipment Download PDFInfo
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- CN112450940A CN112450940A CN201910843402.0A CN201910843402A CN112450940A CN 112450940 A CN112450940 A CN 112450940A CN 201910843402 A CN201910843402 A CN 201910843402A CN 112450940 A CN112450940 A CN 112450940A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2576/00—Medical imaging apparatus involving image processing or analysis
- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
- A61B2576/023—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the heart
Abstract
The embodiment of the application provides an electrocardio detection device, which comprises an electrocardio acquisition module and a detection module connected with the electrocardio acquisition module. The detection module comprises a signal generation module connected to the pulse output end of the electrocardio acquisition module, a signal receiving module connected to the electrocardio acquisition end of the electrocardio acquisition module and a judgment module connected to the signal receiving module. The signal generation module outputs an alternating current signal flowing through a human body at a signal driving end of the electrocardio acquisition module, the signal receiving module receives the alternating current signal at an electrocardio acquisition end of the electrocardio acquisition module, and finally the judgment module judges a receiving result of the signal receiving module to detect whether the leads fall off. Therefore, the electrocardio detection device provided by the embodiment of the application can realize the falling detection of the leads.
Description
Technical Field
The application relates to the technical field of bioelectricity signal acquisition, in particular to an electrocardio detection device, a chip, a method and wearable electronic equipment.
Background
Currently, Electrocardiograph (ECG) acquisition technology has been developed, and ECG acquisition devices are gradually approaching to miniaturization, such as wearable electronic devices like bracelets. During the ECG acquisition process, if the leads fall off or loosen, the result of the ECG acquisition is greatly influenced.
Disclosure of Invention
In view of the above problems, the present invention provides an electrocardiographic detection device, a chip, a method, and a wearable electronic device, which can detect lead-off.
In a first aspect, the present application provides an electrocardiographic detection device, comprising: the electrocardiogram collecting module is provided with an electrocardiogram collecting end, a signal driving end and a pulse output end, wherein the electrocardiogram collecting end is connected with an electrocardiogram lead wire, the electrocardiogram lead wire is used for being in contact connection with a human body, the signal driving end is connected with a driving lead wire, the driving lead wire is used for being in contact connection with the human body, the electrocardiogram collecting module is used for outputting a driving signal to the human body through the driving lead wire through the signal driving end and receiving a signal of the electrocardiogram lead wire through the electrocardiogram collecting end so as to collect electrocardiogram of the human body; the detection module is connected with the electrocardio acquisition module and is used for detecting the connection state of the electrocardio lead wire and the drive lead wire with the human body; wherein, the detection module includes: the signal generation module is connected to the pulse output end and used for outputting a signal to be detected passing through a human body to the driving lead wire according to the pulse signal output by the electrocardio acquisition module; the signal receiving module is connected with the electrocardio acquisition end and outputs a detection signal when receiving a signal to be detected which passes through a human body through an electrocardio lead wire; and the judging module is connected with the signal receiving module and is used for determining the connection state of the electrocardio lead wire and the drive lead wire with the human body according to the detection signal.
In a second aspect, the present application provides an electrocardiograph detection chip, which includes the above electrocardiograph acquisition device.
In a third aspect, the present application provides an electrocardiographic lead detection method, which is applied to the electrocardiographic detection apparatus or the electrocardiographic detection chip, and the method includes: the signal to be detected is output at the signal driving end and is an alternating current signal and flows through a human body through the driving lead wire; detecting a signal to be detected which flows through a human body and is output through an electrocardio lead wire at an electrocardio acquisition end and outputting a detection signal; and receiving the detection signal, and judging the connection state of the human body and the lead wire according to the detection signal.
In a fourth aspect, the present application provides a wearable electronic device, which includes the above electrocardiograph detection apparatus or includes the above electrocardiograph detection chip.
The application provides an electrocardio detection device, through set up signal generation module at electrocardio acquisition module's signal drive end, set up signal receiving module and the judging module who connects signal receiving module at electrocardio acquisition module's electrocardio acquisition end, judging module is used for confirming electrocardio lead wire and drive lead wire and human connected state according to detecting signal, can detect conveniently and lead whether normally to connect. For example, when the leads are normal, the alternating current signal to be detected output by the signal generating module is received by the signal receiving module after passing through a human body and outputs a detection signal; when the leads fall off, the signal receiving module cannot receive the alternating current signals to be detected output by the signal generating module, so that whether the leads fall off or not can be judged by detecting the output signals of the signal receiving module through the judging module.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic connection diagram of an electrocardiograph detection device provided by an embodiment of the present application and a human body.
Fig. 2 shows a schematic diagram of a connection between an electrocardiograph detection device and a human body according to an embodiment of the present application.
Fig. 3 is a waveform diagram showing a first pulse signal, a second pulse signal and a signal to be detected adopted by the central electric detection device in fig. 2.
Fig. 4 shows a schematic diagram of connection between another electrocardiograph detection device and a human body according to an embodiment of the present application.
Fig. 5 shows a schematic connection diagram of an electrocardiograph detection chip provided by an embodiment of the present application and a human body.
Fig. 6 is a schematic flowchart illustrating an electrocardiograph lead detection method according to an embodiment of the present application.
Fig. 7 shows a schematic structural diagram of a wearable electronic device provided in an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
Currently, Electrocardiograph (ECG) acquisition technology has been developed, and ECG acquisition devices are gradually approaching to miniaturization, such as wearable electronic devices like bracelets. In miniaturized ECG acquisition devices, the ECG acquisition is typically performed by an Integrated Circuit (IC) chip that integrates various circuits required for ECG acquisition. When ECG is collected, leads are frequently fallen or loosened, and if the leads are fallen or loosened, great influence is caused when ECG is collected, so that the electrocardiographic waveform is distorted, and the actual electrocardiogram is difficult to obtain, thereby influencing the diagnosis result.
The traditional method for detecting the lead falling is to integrate a current source at the electrocardio acquisition end in the IC chip, the current source outputs constant current, and when the current flows through a human body, a small voltage signal can be generated at the electrocardio acquisition end of the IC chip due to the relatively small impedance of the human body. If the lead wire falls off, the current output by the current source passes through the interior of the IC chip, the impedance of the interior of the IC chip is relatively large, a large voltage signal can be generated at the electrocardio acquisition end of the IC chip, and therefore whether the lead wire falls off or not can be detected by detecting the magnitude of the voltage signal.
However, in practical applications, some devices are often added outside the IC chip in order to improve the performance of the IC chip. For example, in order to improve input impedance and common mode rejection capability of ECG acquisition, a voltage follower is usually connected to an ECG acquisition end outside an IC chip, and since an input end of the voltage follower is high impedance and an output end is low impedance, a current output by a current source directly flows through the voltage follower without flowing through a human body, which results in that it is impossible to detect whether a lead falls off by detecting a voltage signal generated at the ECG acquisition end of the IC chip after the current output by the current source flows through the human body.
In order to solve the above problems, the inventor has made a long-term study and provides an electrocardiograph detection device, a chip, a method and a wearable electronic device in the embodiments of the present application, in which a signal generation module is disposed between a driving lead wire and a signal driving end of an electrocardiograph acquisition module, a signal receiving module is disposed between the electrocardiograph lead wire and the electrocardiograph acquisition end of the electrocardiograph acquisition module, and a determination module connected to the signal receiving module is disposed between the electrocardiograph lead wire and the electrocardiograph acquisition end of the electrocardiograph acquisition module, and the determination module is configured to determine a connection state of the electrocardiograph lead wire and the driving lead wire with a human body according to a detection signal. For example, when the leads are normal, the alternating current signal to be detected output by the signal generating module is received by the signal receiving module after passing through a human body and outputs a detection signal; when the leads fall off, the signal receiving module cannot receive the alternating current signals to be detected output by the signal generating module, so that whether the leads fall off or not can be judged by detecting the output signals of the signal receiving module through the judging module no matter any device is added outside the IC chip.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 exemplarily shows a schematic diagram of a connection between an electrocardiograph detection apparatus 100 provided by an embodiment of the present application and a human body, where the electrocardiograph detection apparatus 100 includes a driving lead 110, at least one electrocardiograph lead 120, an electrocardiograph acquisition module 130, and a detection module 140. The electrocardiograph acquisition module 130 has a signal driving end 131, an electrocardiograph acquisition end 132 and a pulse output end 133. The driving lead wire 110 is connected to the signal driving end 131 of the electrocardiograph acquisition module 130, the electrocardiograph lead wire 120 is connected to the electrocardiograph acquisition end 132 of the electrocardiograph acquisition module 130, and the detection module 140 is connected to the electrocardiograph acquisition module 130. The electrocardiograph acquisition module 130 outputs a driving signal at the signal driving end 131, and the driving signal is output to the human body to stimulate the human body impedance through the driving lead wire 110, so that the electrocardiograph acquisition module 130 can acquire the human body bioelectricity signal at the electrocardiograph acquisition end 132 thereof through the electrocardiograph lead wire 120. The electrocardiograph acquisition module 130 outputs a pulse signal to the detection module 130 at the pulse output end 133, and the detection module 130 generates a signal to be detected according to the pulse signal to detect the connection state of the electrocardiograph lead wire 120 and the driving lead wire 110 with the human body. It is understood that, in some embodiments, the electrocardiograph detecting device 100 may not include the driving lead 110 or the electrocardiograph lead 120, and in use, the electrocardiograph detecting device 100 may be connected to the external driving lead and the electrocardiograph lead to collect the bioelectrical signal of the human body, at this time, the external driving lead is detachably connected to the signal driving end 131 and is configured to be in contact with the human body, and the external electrocardiograph lead is detachably connected to the electrocardiograph collecting end 132 and is configured to be in contact with the human body.
In the embodiment shown in the figures, the electrocardiograph sensing device 100 includes a drive lead wire 110. The driving lead wire 110 includes a first electrode 111, and the first electrode 111 is a driving electrode for contacting with a human body to excite the impedance of the human body. In the present embodiment, the driving lead line 110 is a right leg driving lead line. The electrocardiograph acquisition module 130 outputs a driving signal at the signal driving end 131 thereof, and the driving signal is output to the right leg of the human body after passing through the driving lead wire 110, so as to excite the impedance of the human body, and thus the impedance of the human body can be measured by the device.
In the embodiment shown in the figures, the electrocardiograph detection device 100 includes an electrocardiograph lead wire 110. In this embodiment, there are two electrocardiograph lead wires 120, and accordingly, the electrocardiograph acquisition module 130 also has two electrocardiograph acquisition terminals 132, and the two electrocardiograph lead wires 120 are respectively connected to the two electrocardiograph acquisition terminals 132. Each electrocardiograph lead wire 120 comprises a second electrode 121, and the second electrode 121 is a measuring electrode and is used for contacting with a human body to measure the impedance of the human body and collect bioelectrical signals. The two electrocardiographic lead wires 120 can be a left-hand electrocardiographic lead wire 120 and a right-hand electrocardiographic lead wire 120, respectively, and after the driving signal is output to the human body, the bioelectric signal of the human body can be acquired through the electric signal between the two second electrodes 121 and is output to the electrocardiographic acquisition module 130 through the two electrocardiographic lead wires 120. In this embodiment, the two second electrodes 121 contact the left hand and the right hand of the human body, respectively, and in some embodiments, the two second electrodes 121 may also contact other parts of the human body, such as the chest.
In this embodiment, the ECG collecting module 130 is an ECG IC chip, and various circuits required for ECG collection, measurement and analysis, such as an instrumentation amplifier, are integrated in the ECG collecting module 130. The two electrocardiograph acquisition terminals 132 are respectively connected to two input terminals of the instrumentation amplifier inside the electrocardiograph acquisition module 130.
The detection module 140 is used for detecting the connection state between the electrocardiograph lead wire 120 and the human body and between the drive lead wire 110 and the human body, and can detect whether the electrocardiograph lead wire 120 and the drive lead wire 110 fall off from the human body through the detection module 140.
Optionally, the electrocardiograph detecting device 100 may further include a first voltage follower 150, wherein the first voltage follower 150 includes a voltage follower a1 and a voltage follower a2, and the voltage follower a1 and the voltage follower a2 are respectively connected between each electrocardiograph lead 120 and the corresponding electrocardiograph collecting terminal 132. Specifically, the non-inverting input terminal of the first voltage follower 150 is connected to the electrocardiograph lead 120, and the output terminal of the first voltage follower 150 is connected to the electrocardiograph acquisition terminal 132. Due to the characteristics of high input impedance and low output impedance of the voltage follower, the first voltage follower 150 can improve the input impedance and the common mode rejection capability of the electrocardiograph acquisition terminal 132.
Referring to fig. 1, the detecting module 140 specifically includes a signal generating module 141, a signal receiving module 142, and a determining module 143. The signal generating module 141 is connected between the driving lead wire 110 and the pulse output end 133 of the electrocardiograph acquisition module 130, the signal receiving module 142 is connected between the electrocardiograph lead wire 120 and the electrocardiograph acquisition end 132 of the electrocardiograph acquisition module 130, and the judging module 143 is connected to the output end of the signal receiving module 142. The signal generating module 141 is configured to output a signal to be detected according to the pulse signal output by the electrocardiograph acquisition module 130 at the pulse output end 133, and the signal to be detected is received by the signal receiving module 142 after passing through the human body via the driving lead wire 110. When the signal receiving module 142 receives the signal to be detected, it outputs a detection signal at its output end, and when the judging module 143 receives the detection signal, it indicates that the lead connection state is good. If the determining module 143 does not receive the detection signal output by the signal receiving module 142, that is, the signal receiving module 142 does not receive the signal to be detected flowing through the human body, it indicates that the lead wire falls off. It can be understood that the lead falling may be driving the lead wire 110 to separate from the human body, so that the signal to be detected cannot be output to the human body; or the electrocardiograph lead wire 120 may be separated from the human body, so that the signal receiving module 142 cannot receive the signal to be detected. Therefore, the judging module 143 can judge whether the lead is dropped by receiving the detection signal outputted from the signal outputting module. When the determination module 143 determines that the lead has fallen, an alarm can be issued to alert the user. The reminding manner may include, but is not limited to, an audio reminder, a vibration reminder, a light reminder, a message reminder, and the like. Based on this, in some embodiments, the apparatus 100 may further include an alarm module, connected to the determination module, for reminding the user according to the determination result of the determination module.
In addition, when the determining module 143 receives the detection signal output by the signal receiving module 142, the loosening condition of the lead can be determined by the voltage magnitude of the detection signal. When the voltage of the detection signal is larger, the lead connection condition is good; when the voltage of the detection signal is small, the lead connection is not good, and the lead may be loosened. Optionally, a threshold voltage may be set at the determining module 143, and when the voltage of the detection signal is greater than the threshold voltage, it indicates that the lead connection condition is good; when the voltage of the detection signal is less than the threshold voltage, loosening of the lead is indicated. Meanwhile, when the leads are loosened, the alarm module can also give an alarm to remind a user. The reminding mode can be different from the alarm mode, and a user can distinguish lead falling and lead loosening conveniently. Optionally, the reminding mode may also be the same as the above-mentioned reminding mode, and the specific reminding mode is not described herein again.
In this embodiment of the application, the signal to be detected generated by the signal generating module 141 is an ac signal, and the ac signal can eliminate or reduce the influence of the polarization voltage and the power frequency interference on the ECG collection. Referring to fig. 2, the signal generating module 141 includes a signal generating unit 1411 and a low pass filter unit 1412 connected to the signal generating unit 1411. The signal generating unit 1411 is connected between the driving lead wire 110 and the ecg collecting module 130, and is configured to output an ac signal; the low-pass filtering unit 1412 is used for filtering the interference of the high-frequency signal and preventing the high-frequency signal from damaging the stability of the circuit.
The ecg acquisition module 130 includes a first pin, a second pin, a third pin, a fourth pin, and a fifth pin. The first pin and the second pin are used as two electrocardiograph acquisition ends 132 of the electrocardiograph acquisition module 130, the third pin is used as a signal driving end 131 of the electrocardiograph acquisition module 130, and the fourth pin and the fifth pin are used as two pulse output ends 133 of the electrocardiograph acquisition module 130. Optionally, the fourth pin and the fifth pin may be interrupt pins of the ecg acquisition module 130.
Referring to fig. 2, in the present embodiment, the signal generating unit 1411 includes a first electronic switch and a second electronic switch connected to the first electronic switch, where the first electronic switch and the second electronic switch may be, but not limited to, a field effect transistor, a triode, a thyristor, or the like, and the first electronic switch and the second electronic switch in the present embodiment are exemplified by an N-channel field effect transistor, and specific devices are not limited. The first electronic switch is a field effect transistor Q1, and the second electronic switch is a field effect transistor Q2. The drain D of the field effect transistor Q1 is connected to the power supply, the source S of the field effect transistor Q1 is connected to the drain D of the field effect transistor Q2, the source S of the field effect transistor Q2 is grounded, and the connection node a between the field effect transistor Q1 and the field effect transistor Q2 is connected between the drive lead wire 110 and the signal driving end 131 of the electrocardio acquisition module 130. The signal generating unit 1411 further includes a resistor R1 and a resistor R2, wherein the resistor R1 is connected between the power supply and the drain D of the fet Q1, and the resistor R2 is connected between the source S of the fet Q2 and ground. The control terminal of the first electronic switch is the gate G of the fet Q1, and the control terminal of the second electronic switch is the gate G of the fet Q2. The gate G of the field effect transistor Q1 and the gate G of the field effect transistor Q2 are respectively connected to the two pulse output terminals 133 of the electrocardiograph acquisition module 130. Specifically, the gate G of the fet Q1 is connected to the fourth pin, and the gate G of the fet Q2 is connected to the fifth pin. The gate G of the field-effect transistor Q1 and the gate G of the field-effect transistor Q2 respectively receive the pulse signals output by the electrocardiograph acquisition module 130 at the fourth pin and the fifth pin to be alternately opened and closed, and finally, an alternating current signal is output at the connection node a, and the alternating current signal and the driving signal are superposed at the connection node a to generate a signal to be detected and output to a human body.
Referring to fig. 3, fig. 3 exemplarily shows waveforms of the first pulse signal of the fourth pin, the second pulse signal of the fifth pin, and the signal to be detected at the connection node a. In this embodiment, the first pulse signal and the second pulse signal have the same period, and at the same time, the first pulse signal corresponds to the second pulse signal being at a low level when the first pulse signal is at a high level, and the second pulse signal being at a high level when the first pulse signal is at a low level, and the sum of the duty ratios of the first pulse signal and the second pulse signal is 1. When the first pulse signal is at a high level, the second pulse signal is at a low level; when the second pulse signal is at a low level, the second pulse signal is at a high level. Reflected to the field effect transistor Q1 and the field effect transistor Q2, namely when the field effect transistor Q1 is switched on, the field effect transistor Q2 is switched off; when the fet Q1 is off, the fet Q2 is on. The voltage at the connection node a repeatedly jumps between "0" and "1", thereby generating an alternating current signal.
Referring to fig. 2, the low-pass filter unit 1412 includes a first low-pass filter circuit and a second low-pass filter circuit. The first low-pass filter circuit is connected between the signal generation unit 1411 and the signal driving end 131 and is used for filtering a high-frequency part in the driving signal; the second low-pass filter circuit is connected between the signal generating unit 1411 and the driving lead line 110, and is used for filtering a high-frequency portion of the signal to be detected. Specifically, the first low-pass filter circuit includes a first resistor, specifically a resistor R3, and a second capacitor, specifically a capacitor C1. One end of the resistor R3 is connected with the third pin, and the other end is connected with the connection node a; one end of the capacitor C1 is connected between the resistor R3 and the third pin, and the other end is grounded. The second low-pass filter circuit comprises a second resistor and a second capacitor, wherein the second resistor is specifically a resistor R4, and the second capacitor is specifically a capacitor C2. One end of the resistor R4 is connected to the connection node a, and the other end is connected to the driving lead wire 110; one end of the capacitor C2 is connected between the resistor R4 and the driving lead 110 and the resistor R4, and the other end is grounded.
Referring to fig. 4, in some embodiments, the signal generating unit 1411 includes an amplifier a3, a third electronic switch, and a fourth electronic switch. The inverting input terminal of the amplifier a3 is connected to the third pin, and the output terminal is connected to the driving lead 110 to output the signal to be detected. Further, a resistor R5 is connected between the inverting input terminal of the amplifier a3 and the third pin. The non-inverting input of amplifier a3 includes a first non-inverting input and a second non-inverting input. The first non-inverting input terminal is preset with a first reference voltage Vref1, and the second non-inverting input terminal is preset with a second reference voltage Vref 2. The controlled end of the third electronic switch is connected to the first same-phase input end, and the control end of the third electronic switch is connected to the fourth pin; the controlled end of the fourth electronic switch is connected to the second non-inverting input end, and the control end of the fourth electronic switch is connected to the fifth pin. The third electronic switch and the fourth electronic switch may be, but not limited to, a field effect transistor, a triode, a thyristor, or the like, and the third electronic switch and the fourth electronic switch in this embodiment are illustrated as N-channel field effect transistors, and specific devices are not limited. The third electronic switch is specifically a field effect transistor Q3, the controlled terminals of which are a drain D and a source S, and the control terminal is a gate G. Specifically, the drain D of the fet Q3 is preset with a first reference voltage Vref1, the source S is connected to the first non-inverting input of the amplifier A3, and the gate G is connected to the fourth pin of the ecg collection module 130. The fourth electronic switch is specifically a field effect transistor Q4, the controlled terminals of which are a drain D and a source S, and the control terminal is a gate G. Specifically, the drain D of the field effect transistor Q4 is preset with a second reference voltage Vref2, the source S is connected to the second non-inverting input terminal of the amplifier A3, and the gate G is connected to the fifth pin of the ecg acquisition module 130. Further, a feedback resistor R6 is connected between the inverting input terminal and the output terminal of the amplifier a 3. The amplifier A3 stabilizes the voltage of the signal to be detected output by the amplifier A3 to be the first reference voltage Vref1 or the second reference voltage Vref2 through feedback adjustment. It should be noted that, in this embodiment, the cycle of the first pulse signal output by the electrocardiograph acquisition module 130 at the fourth pin and the cycle of the second pulse signal output by the fifth pin may be equal or unequal, and without limitation, it is only required to meet that the second pulse signal is at a low level when the first pulse signal is at a high level, and the second pulse signal is at a high level when the first pulse signal is at a low level. That is, when fet Q3 is on, fet Q4 is off; when the fet Q3 is turned off, the fet Q4 is turned on, and one of the fet Q3 and the fet Q4 can be continuously turned on, so that the condition that the non-inverting input terminal of the amplifier A3 is not connected to the first reference voltage Vref1 and the second reference voltage Vref2 at the same time is satisfied. However, in other embodiments, the non-inverting input of the amplifier a3 may alternatively be connected to the first reference voltage Vref1 and the second reference voltage Vref2 at the same time.
With reference to fig. 4, the low-pass filter unit 1412 includes a third resistor and a third capacitor. The low-pass filtering unit 1412 functions to filter a high frequency part of the first reference voltage Vref1 or the second reference voltage Vref 2. The third resistor is specifically a resistor R7, one end of the resistor R7 is connected to the non-inverting input terminal of the amplifier A3, and the other end is connected to the source S of the field-effect transistor Q3 and the source S of the field-effect transistor Q4 respectively; the third capacitor is specifically a capacitor C3, one end of the capacitor C3 is connected between the resistor R7 and the amplifier A3, and the other end is grounded.
Referring to fig. 2 again, the signal receiving module 142 is a second voltage follower. The second voltage follower includes voltage follower a4 and voltage follower a 5. The voltage follower a4 and the voltage follower a5 are respectively connected between the two electrocardiograph lead wires 120 and the electrocardiograph acquisition module 130. As an example, the voltage follower a4 is connected between the left-hand ecg lead and the first pin of the ecg collection module 130; the voltage follower a5 is connected between the right-hand ecg lead and the second pin of the ecg collection module 130. Specifically, the non-inverting input end of the voltage follower a4 is connected to the left-hand ecg lead wire, and the output end is connected to the determining module 143; the non-inverting input terminal of the voltage follower a5 is connected to the right-hand-wrist electrical connection line, and the output terminal is connected to the determining module 143. It can be understood that, since the signal receiving module 142 has two voltage followers, whether the lead is dropped can be detected by the two judging modules 143 respectively detecting the output signals of the two voltage followers. In some embodiments, the output ends of the two voltage followers of the signal receiving module 142 may also be connected to a judging module 143, and the judging module 143 receives the output voltages of the two voltage followers at the same time and judges the connection state of the lead according to the difference between the two voltages.
It should be noted that the positional relationship between the first voltage follower 150 and the second voltage follower is not limited. That is, the non-inverting input of the second voltage follower may be connected to the output of the first voltage follower 150. Or may be connected to the non-inverting input of the first voltage follower 150. Fig. 2 and 4 only show examples in which the non-inverting input terminal of the second voltage follower is connected to the output terminal of the first voltage follower 150.
According to the electrocardio detection device provided by the embodiment of the application, the signal generation module is arranged between the driving lead wire and the signal driving end of the electrocardio acquisition module, the signal receiving module is arranged between the electrocardio lead wire and the electrocardio acquisition end of the electrocardio acquisition module, and the judgment module is connected with the signal receiving module; when the leads fall off, the signal receiving module cannot receive the alternating current signals to be detected output by the signal generating module, so that whether the leads fall off or not can be judged by detecting the output signals of the signal receiving module through the judging module regardless of adding any device outside the electrocardio acquisition module.
Referring to fig. 5, fig. 5 exemplarily shows a schematic connection diagram of an electrocardiograph detection chip 200 provided by an embodiment of the present application and a human body. The electrocardiograph detection chip 200 includes the electrocardiograph acquisition module 210 and the detection module 220, which are the electrocardiograph acquisition module 130 and the detection module 140. The ECG detecting chip 200 is an ECG IC chip, and circuits required for ECG acquisition, measurement and analysis are integrated in the ECG detecting chip. In this embodiment, the ecg collection module 210 is an instrumentation amplifier, and the instrumentation amplifier can be used to connect the ecg lead wire and the driving lead wire, respectively. Because the detection module 220 and the electrocardiograph acquisition module 210 are integrated in the electrocardiograph detection chip 200, the electronic switch in the signal generation module can be turned on or off according to the pulse signal provided in the chip. Moreover, the detection module 220 in this embodiment is integrated inside the cardiac electric detection chip, so that no matter whether a device is added outside the cardiac electric detection chip 200 or any device is added, the lead detection is not affected, and the applicability is relatively strong.
The electrocardio detection chip that this application embodiment provided, the detection module integration that drops will detect the lead is inside this electrocardio detection chip for any device of electrocardio detection chip outside addition can not produce the influence to the detection of leading, and the suitability is strong.
Referring to fig. 6, fig. 6 schematically illustrates an electrocardiograph lead detection method 300, wherein the method 300 employs the above electrocardiograph lead device and the above electrocardiograph lead chip, and the method 300 may include steps S310 to S330.
Step S310: and outputting a signal to be detected at the signal driving end.
The signal driving end is connected with the driving lead wire, and after the signal driving end outputs a signal to be detected, the signal to be detected flows through the human body through the driving lead wire. Further, the signal to be detected is an alternating current signal, and the alternating current signal can eliminate or reduce the influence of polarization voltage and power frequency interference on ECG acquisition.
Step S320: and detecting a signal to be detected which flows through the human body and is output through the electrocardio lead wire at the electrocardio acquisition end and outputting a detection signal.
The electrocardio acquisition end is connected with the electrocardio lead wire, and when the signal to be detected is output to a human body, the signal to be detected can be detected at the electrocardio acquisition end and a detection signal is output.
Step S330: and receiving the detection signal, and judging the connection state of the human body and the lead wire according to the detection signal.
The lead wire comprises an electrocardiogram lead wire and a driving lead wire. When the connection state of the lead wire and the human body is good, the signal to be detected can be detected at the electrocardio acquisition end, and when the signal to be detected is detected, a detection signal can be output to indicate that the connection state of the lead wire and the human body is good; when the lead wire falls off, the signal to be detected cannot be detected at the electrocardio acquisition end, and when the signal to be detected is not detected, the detection signal cannot be output, so that the lead falls off. That is, the lead connection state is judged according to the existence of the detection signal.
In some embodiments, a detection signal is output when the detection action is performed. That is, when the connection state of the lead wire and the human body is good, the signal to be detected can be detected at the electrocardio acquisition end, and when the signal to be detected is detected, the output detection signal is at a high level, which indicates that the connection state of the lead wire and the human body is good; when the lead wire falls off, the signal to be detected cannot be detected at the electrocardio acquisition end, and when the signal to be detected is not detected, the output detection signal is at a low level, which indicates that the lead wire falls off. That is, the lead connection state is judged according to the state of the detection signal level. Based on this, in some embodiments, step S330 may include: if the voltage of the detection signal is larger than the preset threshold voltage, judging that the connection between the lead wire and the human body is normal; and if the voltage of the detection signal is less than or equal to the preset threshold voltage, judging that the connection of the lead wire is abnormal.
According to the electrocardio lead detection method provided by the embodiment of the application, a signal to be detected is output at the signal driving end, the signal to be detected is detected at the electrocardio acquisition end, and finally the connection state of the lead is judged according to the detection result. Whether the lead is dropped or not can be judged by the method regardless of any external device added.
Referring to fig. 7, fig. 7 schematically illustrates a wearable electronic device 400, where the wearable electronic device 400 includes the electrocardiograph detection apparatus 100 or the electrocardiograph detection chip 200.
Further, wearable electronic device 400 may be, but is not limited to being, a smart bracelet.
According to the wearable electronic device provided by the embodiment of the application, the signal generation module is arranged between the driving lead wire and the signal driving end of the electrocardio acquisition module, the signal receiving module is arranged between the electrocardio lead wire and the electrocardio acquisition end of the electrocardio acquisition module, and the judgment module is connected with the signal receiving module; when the leads fall off, the signal receiving module cannot receive the alternating current signals to be detected output by the signal generating module, so that whether the leads fall off or not can be judged by detecting the output signals of the signal receiving module through the judging module regardless of adding any device outside the electrocardio acquisition module.
Although the present application has been described with reference to the preferred embodiments, it is to be understood that the present application is not limited to the disclosed embodiments, but rather, the present application is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the present application.
Claims (16)
1. An electrocardiographic detection device, the device comprising:
the electrocardiogram collecting module is provided with an electrocardiogram collecting end, a signal driving end and a pulse output end, the electrocardiogram collecting end is used for being connected with an electrocardiogram lead wire, the electrocardiogram lead wire is used for being in contact connection with a human body, the signal driving end is used for being connected with a driving lead wire, the driving lead wire is used for being in contact connection with the human body, the electrocardiogram collecting module is used for outputting a driving signal to the human body through the driving lead wire by the signal driving end and receiving the signal of the electrocardiogram lead wire by the electrocardiogram collecting end so as to collect electrocardiogram of the human body; and
the detection module is connected with the electrocardio acquisition module and is used for detecting the connection state of the electrocardio lead wire and the drive lead wire with a human body; wherein the detection module comprises:
the signal generation module is connected to the pulse output end and used for outputting a signal to be detected which passes through a human body to the driving lead wire according to the pulse signal output by the electrocardio acquisition module;
the signal receiving module is connected to the electrocardio acquisition end and outputs a detection signal when receiving the signal to be detected passing through a human body through the electrocardio lead wire; and
and the judging module is connected with the signal receiving module and is used for determining the connection state of the electrocardio lead wire and the drive lead wire with the human body according to the detection signal.
2. The cardiac electrical detection apparatus of claim 1, wherein the signal generation module comprises:
the signal generating unit is connected to the pulse output end and used for outputting the signal to be detected to the driving lead wire according to the pulse signal output by the electrocardio acquisition module; and
a low pass filtering unit connected to the signal generating unit.
3. The electrocardiograph detection device according to claim 2, wherein the signal generation unit includes a first electronic switch and a second electronic switch, one end of the first electronic switch is connected to the second electronic switch and the other end of the first electronic switch is connected to a power supply, the other end of the second electronic switch is connected to ground, a connection node of the first electronic switch and the second electronic switch is connected to the signal driving end, a control end of the first electronic switch and a control end of the second electronic switch are further connected to the pulse output end, and the first electronic switch and the second electronic switch are alternately closed according to the pulse signal output by the electrocardiograph acquisition module at the pulse output end so as to output a signal to be detected, which passes through a human body, to the driving lead line at the connection node.
4. The electrocardiograph sensing device according to claim 3 wherein said first electronic switch comprises a first transistor, a first field effect transistor or a first thyristor; the second electronic switch comprises a second triode, a second field effect transistor or a second silicon controlled rectifier.
5. The cardiac electrical detection apparatus as set forth in claim 2, wherein the low pass filtering unit comprises:
the first low-pass filter circuit is connected between the signal generating unit and the signal driving end; and
and one end of the second low-pass filter circuit is connected to the signal generating unit, and the other end of the second low-pass filter circuit is connected with the driving lead wire.
6. The electrocardiograph lead device according to claim 5, wherein the first low-pass filter circuit includes a first resistor and a first capacitor, the first resistor is connected between the signal generating unit and the signal driving terminal, one end of the first capacitor is connected between the first resistor and the signal driving terminal, and the other end of the first capacitor is grounded;
the second low-pass filter circuit comprises a second resistor and a second capacitor, one end of the second resistor is connected to the signal generating circuit, the other end of the second resistor is used for being connected with the driving lead wire, and one end of the second capacitor is connected to the second resistor and the other end of the second capacitor is grounded.
7. The electrocardiograph detection device according to claim 2, wherein the signal generation unit includes an amplifier, a third electronic switch and a fourth electronic switch, an inverting input terminal of the amplifier is connected to the signal driving terminal, and an output terminal of the amplifier is used for connecting the driving lead wire, a non-inverting input terminal of the amplifier includes a first non-inverting input terminal preset with a first reference voltage and a second non-inverting input terminal preset with a second reference voltage, a controlled terminal of the third electronic switch is connected to the first non-inverting input terminal, a controlled terminal of the fourth electronic switch is connected to the second non-inverting input terminal, a control terminal of the third electronic switch and a control terminal of the fourth electronic switch are further connected to the pulse output terminal, the third electronic switch and the fourth electronic switch are alternately closed according to the pulse signal output by the electrocardiograph acquisition module so that the amplifier outputs a signal to be detected, and the voltage of the signal to be detected is the first reference voltage or the second reference voltage.
8. The electrocardiograph sensing device according to claim 7 wherein said third electronic switch comprises a third transistor, a third field effect transistor or a third thyristor; the fourth electronic switch comprises a fourth triode, a fourth field effect transistor or a fourth controllable silicon.
9. The electrocardiograph detection device according to claim 7, wherein the low-pass filter unit comprises a third resistor and a third capacitor, the third resistor is connected to the non-inverting input terminal of the amplifier, one end of the third capacitor is connected between the third resistor and the amplifier, and the other end of the third capacitor is grounded.
10. The electrocardiograph detection device according to claim 1 further comprising a first voltage follower, wherein one end of the first voltage follower is connected to the electrocardiograph acquisition module, and the other end of the first voltage follower is connected to the electrocardiograph lead wire to change the input impedance of the electrocardiograph acquisition module.
11. The electrocardiograph detection device according to any one of claims 1 to 10, wherein the signal receiving module is a second voltage follower, a non-inverting input terminal of the second voltage follower is connected to the electrocardiograph acquisition terminal, and an output terminal of the second voltage follower is connected to the judging module.
12. The electrocardiograph detection device according to any one of claims 1 to 10, further comprising: the signal generating module is connected between the driving lead wire and the pulse output end; the electrocardio lead wire comprises a second electrode used for being connected with a human body, and the signal receiving module is connected between the electrocardio lead wire and the electrocardio acquisition end.
13. An electrocardiographic detection chip characterized by comprising the electrocardiographic detection device according to any one of claims 1 to 12.
14. An electrocardiographic lead detection method applied to the electrocardiographic detection device according to any one of claims 1 to 12 or the electrocardiographic detection chip according to claim 13, the method comprising:
outputting a signal to be detected at the signal driving end, wherein the signal to be detected is an alternating current signal and flows through a human body through the driving lead wire;
detecting the signal to be detected which flows through the human body and is output by the electrocardio lead wire at the electrocardio acquisition end and outputting a detection signal; and
and receiving the detection signal, and judging the connection state of the human body and the lead wire according to the detection signal.
15. The method for detecting an electrocardiographic lead according to claim 14, wherein the receiving the detection signal and determining the connection state of the human body and the lead line according to the detection signal comprises:
if the voltage of the detection signal is larger than a preset threshold voltage, judging that the connection between the lead wire and the human body is normal; and
and if the voltage of the detection signal is less than or equal to the preset threshold voltage, judging that the connection of the lead wire is abnormal.
16. Wearable electronic equipment, characterized in that the wearable equipment comprises the electrocardio detection device of any one of claims 1-12 or the electrocardio detection chip of claim 13.
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| CN201910843402.0A CN112450940A (en) | 2019-09-06 | 2019-09-06 | Electrocardio detection device, chip, method and wearable electronic equipment |
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