CN105597233A - Heart pacemaker with noncontact power supply function - Google Patents

Abstract

The invention discloses a cardiac pacemaker with non-contact power supply function, which comprises a storage battery, an external pacemaker circuit and an energy receiving device in the body, the storage battery is connected with the external pacemaker circuit, and the external pacemaker circuit There is a wireless ECG sensor at the end, the wireless ECG sensor is installed at the heart outside the body, the energy receiving device in the body is set in the skin of the left shoulder, the external pacemaker circuit is connected with the energy receiving device in the body through electromagnetic coupling, and the energy receiving device in the body passes through Electrodes are connected to the heart. The present invention judges the degree of fatigue of the heart by measuring the heart rate variation characteristic through the measurement of the electrocardiogram signal, and controls the amplitude of the pulse voltage and the conduction stimulation time to be provided; Installed outside the body, only the non-contact power supply secondary circuit is installed in the patient's body, which greatly reduces the volume of the built-in circuit, and no longer requires regular surgery to replace the battery.

Description

Pacemaker with contactless power supply

technical field

The invention relates to the technical field of cardiac pacemakers, in particular to a cardiac pacemaker with a non-contact power supply function, capable of monitoring and pacing the beating state of the heart outside the body, and belongs to the field of medical electronics.

Background technique

The cardiac pacemaker is used for auxiliary stimulation of human heart pacing. It is usually installed on the skin of the patient's body under the left shoulder. The pacemaker is placed under the skin of the left chest to make the skin prop up to form a pouch. It is placed under the clavicle of the left chest The venipuncture leads to the electrode, and the electrode leads from the vein to the heart and is fixed by the threaded hook at the front end piercing the inner side of the heart, as shown in Figure 1. Because traditional pacemakers are usually relatively large, the patient's skin cannot be closed for a long time after installation, and bathing and exercise are restricted. The suffering of patients is beyond words, some patients even stay at home, and many people cannot go to work, work and strenuous exercise such as running.

Since the traditional pacemaker has a built-in disposable battery, such a pacemaker must be large enough to keep working for about 10 years, and it must be replaced regularly in order to save power and cannot do strenuous exercise. When the skin has just closed a few years later, it is possible to take a shower, and the sweat does not soak into the body, and the next operation begins again, and the patient's quality of life is only maintained at the lowest level.

Some scholars have also proposed pacemakers based on wireless power supply, but these pacemakers still need built-in batteries, wireless communication circuits, and detection circuits. The size of the pacemaker cannot be reduced to the extent that the skin is completely closed after surgery.

Contents of the invention

In order to solve the above technical problems, the present invention provides a cardiac pacemaker with a non-contact power supply function, which only needs to install an internal energy receiving device in the patient's body, detect ECG signals outside the body and use the method of estimating electrode voltage for non-contact power supply , does not need to directly detect the voltage on both sides of the heart electrode, and does not need to install an external communication circuit, which reduces the overall volume of the implant, prolongs the service life, and can work permanently without replacement, so that patients can avoid multiple operations. pain.

In order to achieve the above object, the technical solution of the present invention is: a cardiac pacemaker with a non-contact power supply function, including a battery, an external pacemaker circuit and an energy receiving device in the body, and the battery is connected to the external pacemaker circuit , the outer end of the external pacemaker circuit is equipped with a wireless ECG sensor, the wireless ECG sensor is installed at the heart outside the body, the energy receiving device in the body is set in the skin of the left shoulder, and the external pacemaker circuit and the energy receiving device in the body are electromagnetically coupled The energy receiving device in the body is connected with the heart through electrodes.

The energy receiving device in the body includes a non-contact power supply secondary coil, a rectifier circuit, a filter circuit and an electrode interface, the non-contact power supply secondary coil is connected with the non-contact power supply primary coil through electromagnetic coupling, and the non-contact power supply secondary coil is connected to the The circuits are connected, the rectification circuit is connected with the filter circuit, the filter circuit is connected with the electrode interface, and the electrode interface is connected with the electrode.

The external pacemaker circuit includes a signal detection filter circuit, a control circuit, a non-contact power supply primary circuit and a non-contact power supply primary coil, the wireless ECG sensor is connected to the signal detection filter circuit, and the signal detection filter circuit is connected to the control circuit The control circuit is connected with the primary circuit of the non-contact power supply, and the primary circuit of the non-contact power supply is connected with the primary coil of the non-contact power supply.

The control circuit includes a three-axis gyroscope, an A/D conversion circuit, a data processing analysis circuit, a fatigue degree judgment circuit and an output control circuit, the A/D conversion circuit is connected with a signal detection filter circuit, and the three-axis gyroscope, A/D The D conversion circuit is respectively connected with the data processing and analysis circuit, the data processing and analysis circuit is connected with the fatigue degree judgment circuit, the fatigue degree judgment circuit is connected with the output control circuit, and the output control circuit is connected with the non-contact power supply primary side circuit.

The wireless ECG sensor is installed in the corset garment near the external heart in a wearable manner, the primary coil of the non-contact power supply and the secondary coil of the non-contact power supply are installed under the left shoulder in parallel, the primary coil of the non-contact power supply and the secondary coil of the non-contact power supply The distance between the secondary coils is between 0.3 and 0.5 cm, and the non-contact power supply primary coil and the non-contact power supply secondary coil transmit magnetic field energy in a non-contact manner.

The non-contact power supply secondary coil is a coil made of thin copper enameled wire, and the rectifier circuit and filter circuit are chip components.

Its working principle is: the wireless ECG sensor collects the user's ECG signal, and the signal detection filter circuit uses the operational amplifier inside to amplify, filter, and raise the weak ECG signal to finally generate the waveform of the ECG analog signal; A/ The D conversion circuit converts the ECG analog signal waveform into a digital signal and sends it to the data processing and analysis circuit for analysis and processing. The fatigue degree judgment circuit judges the state of the heart according to the processing results of the ECG signal, and the output control circuit controls the non-contact power supply primary circuit. The duty cycle t _on of the switching device is used to transfer energy from the primary coil of the non-contact power supply to the secondary coil of the non-contact power supply, and the internal energy receiving device rectifies and filters the heart through the electrodes to perform pacing stimulation.

The method for judging heart fatigue by the fatigue degree judging circuit: measuring the time difference between RR peaks of the electrocardiographic signal waveform, calculating the variation characteristics of heart rate, and judging as fatigue if the time between RR peaks is greater than the normal time range.

The output control circuit changes the output voltage u o of the electrode by controlling the duty ratio t _on of the switching device of the primary side circuit of the non-contact power supply, and the output control circuit changes the output voltage u _o of the electrode by judging and controlling the total power supply time of the primary side circuit of the non-contact power supply The duration of the electrode output voltage u _o , the duration is the conduction stimulation time t _tot of an electrocardiographic pulse.

The three-axis gyroscope measures the positions, moving trajectories and accelerations of the three coordinate axes in the three-dimensional space, and sends the obtained signals to the data processing and analysis circuit for analysis and processing. When the body movement is detected, the output control circuit Immediately strengthen the cardiac pacing stimulation signal, increase the voltage amplitude of the stimulation and prolong the conduction stimulation time t _tot of the electrocardiographic pulse.

The present invention judges the fatigue degree of the heart by measuring the ECG signal, using the heart rate variation characteristic, judges the fatigue degree by the fatigue degree judging module, and controls the pulse provided by the non-contact power supply primary side circuit to the non-contact power supply secondary side coil through the output control circuit The magnitude of the voltage and the length of the stimulation time; at the same time, the patient's body changes are measured by the three-axis gyroscope to realize the judgment of active pacing. Different from the traditional pacemaker, the present invention installs the ECG signal detection filter circuit, cardiac pacemaker, battery and non-contact power supply primary circuit outside the body, and only the non-contact power supply secondary circuit is installed on the patient In the subcutaneous pouch of the left chest, the volume of the built-in circuit can be greatly reduced, and the need for regular surgery to replace the pacemaker battery is no longer required. The pacemaker based on the wireless power supply technology of the present invention does not need a built-in battery, wireless communication circuit and detection circuit, and the energy receiving device in the body does not need to directly detect the voltage on both sides of the heart electrodes, and does not need to be equipped with an external pacemaker circuit to match Compared with the previous built-in dual-chamber pacemaker, the volume of the energy receiving device in the body is reduced to less than 1/4 of the original, and the thickness is reduced to less than 1/3 of the original. After the implantation of the energy receiving device in the body Can work permanently without replacement.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a diagram of the installation position of a traditional cardiac pacemaker.

Fig. 2 is a functional block diagram of the present invention.

FIG. 3 is a circuit diagram of the signal detection filter circuit of the present invention.

Fig. 4 is the ECG signal waveform of the present invention.

Fig. 5 is a relative position diagram of the non-contact power supply coil of the present invention.

Fig. 6 is a circuit voltage waveform of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

A cardiac pacemaker with non-contact power supply function, the functional block diagram is shown in FIG. 2 , including a battery 9 , an external pacemaker circuit 27 and an internal energy receiving device 11 . The storage battery 9 is used as the power supply of the whole device, and provides electric energy support for the whole device. Installed at the heart outside the body, the internal energy receiving device 11 is placed in the skin of the left shoulder, the external pacemaker circuit 27 is connected to the internal energy receiving device 11 through electromagnetic coupling, and the internal energy receiving device 11 is connected to the heart through electrodes.

The wireless ECG sensor 25 is installed in the corset garment near the external heart in a wearable manner to realize the collection of the patient's ECG signal. The wireless ECG sensor 25 is connected with the external pacemaker circuit 27 . The external pacemaker circuit 27 includes a signal detection filter circuit 1, a control circuit 12, a non-contact power supply primary side circuit 7 and a non-contact power supply primary side coil 13, a wireless ECG sensor 25 is connected with the signal detection filter circuit 1, and the signal detection The filter circuit 1 is connected with the control circuit 12 , the control circuit 12 is connected with the non-contact power supply primary circuit 7 , and the non-contact power supply primary circuit 7 is connected with the non-contact power supply primary coil 13 .

The signal detection filter circuit 1 processes the ECG signals collected by the wireless ECG sensor 25 to generate corresponding waveforms. The wireless ECG sensor 25 detects the original ECG signal u _dec of the human body. Since the original ECG signal u _dec is very weak, only 0.05-5mV, the signal detection filter circuit 1 needs to amplify the collected original ECG signal. The circuit diagram of the signal detection filter circuit 1 is shown in Figure 3. The operational amplifier AMP1 is an OP07 operational amplifier, and the operational amplifier AMP1 is used to form a second-order low-pass filter circuit and amplify the ECG signal. The main function of the low-pass filter circuit is to filter out high-frequency interference outside the frequency band of the ECG signal to improve the system signal-to-noise ratio. The design upper limit cut-off frequency of the low-pass filter circuit is 45Hz. The operational amplifier AMP2 constitutes a second-order high-pass filter circuit. The high-pass filter circuit can filter out low-frequency noise components outside the frequency band of the ECG signal and improve the system signal-to-noise ratio. The lower limit cut-off frequency of the circuit design should be 0.03Hz, which is required by the AHA standard. Requirements for diagnostic ECG equipment. In order to avoid the 50Hz power frequency interference generated when the battery is charged, and to ensure that other signals pass through without attenuation, a band-stop notch filter is designed, and the operational amplifiers AMP3 and AMP4 form a notch filter circuit. After filtering the amplified ECG signal u _heart , when the input voltage of the original ECG signal u _dec is 1mV, the output voltage of the ECG signal u _heart can reach about 1V, that is, the amplification factor of the signal detection filter circuit 1 is about 1000 times. The maximum input voltage of the A/D conversion circuit 3 is 3.3V, and the output voltage of the ECG signal u _heart is within the conversion range of the A/D conversion circuit 3 .

The control circuit 12 is composed of an ARM9 chip as its core circuit, and can accurately judge the fatigue degree of the patient according to the pulse waveform of the ECG signal. The control circuit 12 includes a three-axis gyroscope 2, an A/D conversion circuit 3, a data processing and analysis circuit 4, a fatigue degree judgment circuit 5, and an output control circuit 6. The A/D conversion circuit 3 is connected to the signal detection filter circuit 1, and the three The axial gyroscope 2 and the A/D conversion circuit 3 are respectively connected with the data processing and analysis circuit 4, the data processing and analysis circuit 4 is connected with the fatigue degree judgment circuit 5, the fatigue degree judgment circuit 5 is connected with the output control circuit 6, and the output control The circuit 6 is connected with the non-contact power supply primary side circuit 7 , and the non-contact power supply primary side circuit 7 is connected with the non-contact power supply primary side coil 13 .

The energy receiving device 11 in the body includes a non-contact power supply secondary coil 14, a rectifier circuit 8, a filter circuit 17 and an electrode interface 10. The non-contact power supply secondary coil 14 is connected with the non-contact power supply primary coil 13 through electromagnetic coupling, and the non-contact power supply The secondary coil 14 is connected to the rectifier circuit 8, the rectifier circuit 8 is connected to the filter circuit 17, the filter circuit 17 is connected to the electrode interface 10, and the electrode interface 10 is connected to the electrode. The electrodes include a positive electrode 15 and a negative electrode 16. The input ends of the positive electrode 15 and the negative electrode 16 are respectively connected to the motor interface 10. The output ends of the positive electrode 15 and the negative electrode 16 are inserted into the heart through the cardiac artery and hooked on the inner wall of the heart. Therefore, the resistance at both ends of the electrodes inside the heart is the load Req of the non-contact power supply circuit, and the stimulation of the heart can be _realized by applying a voltage to the positive electrode 15 and the negative electrode 16 through the energy receiving device 11 in the body. The voltage between the two electrodes The amplitude is 1~5V.

The non-contact power supply primary side coil 13 and the non-contact power supply secondary side coil 14 are installed in parallel under the left shoulder. The distance between the contact power supply secondary coils 14 is 0.3~0.5cm. As shown in FIG. 5 , the non-contact power supply primary coil 13 and the non-contact power supply secondary coil 14 transmit magnetic field energy in a non-contact manner. The non-contact power supply secondary coil 14 is a coil made of thin copper enameled wire, and the rectifier circuit 8 and the filter circuit 17 are chip components, which reduce the volume of the energy receiving device 11 in the body. The non-contact power supply secondary coil 14 is wound along the outer edges of the rectifier circuit 8, the filter circuit 17 and the electrode interface 10, the total thickness of the circuit and the coil is within 2mm, and the thickness of the shell is not more than 3mm, and the length and width are 25mm× Within 25mm.

The degree of fatigue can be divided into physical fatigue and mental fatigue. The present invention only focuses on physical fatigue, and judges the degree of fatigue based on the beating of the heart. When the patient is exercising vigorously, the frequency of the heart beat increases, but the blood supply is not enough to meet the needs of the human body, and the waveform of the heart beat is abnormal. At this time, a pacemaker is needed to stimulate the heart to increase the intensity of pumping blood; if the patient does not During strenuous exercise, when the heartbeat is stable, it can be considered that the fatigue state is zero, and there is no need for cardiac pacemaker stimulation.

The waveform of the ECG signal has certain characteristics. The waveform of the ECG signal processed by the signal detection filter circuit is shown in Figure 4. Among them, P wave: represents the atrial depolarization wave; QRS wave: represents the ventricular depolarization wave; T wave: represents the Ventricular repolarization wave; U wave: the influence of subsequent potential PR interval, the time from the beginning of atrial depolarization to the beginning of ventricular depolarization; QRS interval: representing the time required for ventricular depolarization; Q-T interval: representing ventricular depolarization and the time required for the whole process of ventricular repolarization; S-T segment: represents a period of time from the end of ventricular depolarization to the beginning of repolarization. During this period, the ventricular muscle is in a depolarized state, which can reflect the blood supply state of the ventricle.

Heart rate HR (HeartRate, HR) has an obvious response in fatigue. The main factor affecting HR is physical load. HRV (HeartRateVariability) refers to the small fluctuation of continuous heartbeat interval (R-R interval). HRV is used to measure the fatigue state. To obtain the HRV signal, the heartbeat interval must be obtained. In order to improve the accuracy of collecting the HRV signal, it is necessary to measure the time difference between two adjacent R wave peaks. Some studies have found that when the driver is fatigued, the standard RR interval will gradually increase with the increase of driving time, and the heart rate variability will increase. Therefore, the time difference between RR peaks is measured here, and the heart rate variability is calculated. If the time between RR peaks is less than the normal time range, it is judged as fatigue. The calculation of heart rate variability includes two contents, one is whether the RR interval is within a reasonable range; the other is continuous heart rate fluctuation (HeartRateVariability, HRV). That is, the change characteristics (acceleration) of the heartbeat speed must be controlled within a certain range. If the HRV characteristics of the patient exceed the characteristic range value, it means that the heart function is abnormal, and the pacemaker stimulation function needs to be turned on.

In addition, arrhythmia (referring to any abnormality in the origin, frequency, rhythm, conduction, etc.) of the heart beat is judged by the electrocardiogram. The origin of the normal heart beat should be the sinoatrial node, and the heart rhythm produced by the abnormal excitation of the sinus node Arrhythmia mainly includes tachycardia, bradycardia, arrhythmia and asystole. The phenomenon of arrhythmia is determined, and the amplitude of the stimulation voltage u _o and the conduction stimulation time t _tot that the cardiac pacemaker needs to provide are determined according to the phenomenon. The duration of the stimulation voltage u _o is the conduction stimulation time t _tot .

The working principle of the present invention is: the wireless ECG sensor 25 collects the user's ECG signal, and the signal detection filter circuit 1 utilizes an operational amplifier therein to amplify, filter, and raise the weak ECG signal to finally generate an ECG analog signal Waveform; the A/D conversion circuit 3 converts the ECG analog signal waveform into a digital signal and sends it to the data processing and analysis circuit 4 for analysis and processing, and the fatigue degree judgment circuit 5 judges the state of the heart according to the processing result of the ECG signal, and outputs the control circuit 6 Control the non-contact power supply primary circuit 7, the non-contact power supply primary coil 13 transmits energy to the non-contact power supply secondary coil 14, and the internal energy receiving device 11 rectifies and filters the heart through electrodes to perform pacing stimulation.

The present invention can realize the active pacing of the cardiac pacemaker through the three-axis gyroscope 2 . When the patient is in a state of exercise such as standing suddenly, running, etc., the blood supply to the heart does not appear to be insufficient for the time being. If only the method of passively detecting the ECG signal is used, the stimulation signal strength of the cardiac pacemaker is difficult to reach the level of the exercise within a few seconds. If necessary, the patient may experience extreme cases of palpitation, shortness of breath and even abnormal heartbeat. The present invention uses the three-axis gyroscope 2 to simultaneously measure the positions, moving tracks and accelerations of three coordinate axes in three-dimensional space in six directions, and sends the signals obtained by the three-axis gyroscope 2 to the data processing and analysis circuit 4 for processing. When the body movement is detected, the cardiac pacing stimulation signal is immediately strengthened, that is, the voltage amplitude of the stimulation is increased and the conduction stimulation time t _tot of the electrocardiographic pulse is prolonged. This method of actively judging the state of human body movement can quickly stimulate the heart function within 1 second, and can prevent insufficient cerebral blood supply or even sudden death caused by the patient getting up suddenly or suddenly changing from sitting to standing.

The circuit voltage waveform of the present invention is shown in FIG. 6 . The non-contact power supply primary side circuit 7 is powered by a storage battery 9 . The terminal voltage u _i and current i _i supplied by the storage battery 9 to the non-contact power supply primary circuit 7 are detected by the external pacemaker circuit 27 to obtain power P _i = u _i × i _i . According to the circuit structure, the approximate value of the transmission efficiency η of the non-contact circuit is obtained. The load at both ends of the positive electrode 15 and the negative electrode 16 is the heart resistance, which can be _{equivalent to the resistance Req} , which is directly measured when the positive electrode 15 and the negative electrode 16 are installed. obtained, then P _i = u _i × i _i = u _o ² / R _eq , thus the amplitude of the voltage u _o between the two electrodes can be determined, and the amplitude of the voltage u _o between the electrodes is controlled within 1~ between 5V. The energy receiving device 11 in the body of the present invention does not need to directly detect the voltage on both sides of the heart electrode, and does not need to install a communication circuit that matches the external pacemaker circuit 27. Compared with the previous built-in dual-chamber pacemaker, the energy in the body The volume of the receiving device 11 is reduced to less than 1/4 of the original, and the thickness is reduced to less than 1/3 of the original. After implanted, the energy receiving device 11 in the body can work permanently without replacement.

The non-contact power supply primary side circuit 7 selects a full-bridge DC-DC converter circuit with transformer isolation, and converts direct current into high-frequency alternating current (65kHz) by a single-phase full-bridge circuit. u _dr1 and u _dr2 are driving signal waveforms for driving the full bridge circuit. u _p is the voltage waveform at both ends of the primary coil 13 for non-contact power supply. Therefore, the ratio of the pulse width of the driving signal waveform driving the full-bridge circuit to the cycle time is called the duty cycle t _on . The duration of the electrode output voltage, that is, the on-stimulation time t _tot of an ECG pulse, represents the total time from the start of the non-contact power supply circuit to the cut-off of the power supply of the non-contact power supply circuit, and t _tot is usually 10ms~100ms. The output control circuit 6 changes the output voltage of the electrode by controlling the duty cycle t _on of the switching device of the primary side circuit 7 of the non-contact power supply, and the output control circuit 6 judges and controls the total power supply time of the primary side circuit 7 of the non-contact power supply, so as to Change the on-stimulus time t _tot .

The method for judging heart fatigue by the fatigue degree judging circuit 5 is: measure the time difference between the RR peaks (between two peaks R) of the ECG signal waveform, and calculate the variation characteristics of the heart rate, if the time between the RR peaks is greater than the normal time range ( Generally take 1 second) is judged as fatigue. Judging the state can be divided into two situations: if the human body is in a state of heart fatigue, it can be determined that the blood supply is not enough to meet the needs of body functions, and the pacemaker should be activated; otherwise, the human body is less fatigued, and the pacemaker should be turned off or activated Work in a weakly stimulated state.

The degree of human fatigue judged by the fatigue degree judging circuit 5 is sent to the output control circuit 6. When the human body is tired, the output control circuit 6 sends a control voltage to the non-contact power supply primary circuit 7 to stimulate the heart. The greater the degree of fatigue, the greater the duty cycle t _on , the greater the voltage amplitude of the stimulation, and at the same time increase the on-stimulation time t _tot of the ECG pulse. If the degree of fatigue is small, reduce the duty cycle t _on , the voltage amplitude of the stimulation will decrease, and at the same time shorten the conduction stimulation time t _tot of the ECG pulse; if the human body is resting or sleeping and the heartbeat is stable, it will not Stimulate.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention.

Claims (10)

1. A cardiac pacemaker with non-contact power supply function, characterized in that it includes a battery (9), an external pacemaker circuit (27) and an internal energy receiving device (11), the battery (9) and the external The pacemaker circuit (27) is connected, the external pacemaker circuit (27) is provided with a wireless ECG sensor (25), the wireless ECG sensor (25) is installed at the heart outside the body, and the energy receiving device (11 ) is set in the skin of the left shoulder, the external pacemaker circuit (27) is connected with the energy receiving device (11) in the body through electromagnetic coupling, and the energy receiving device (11) in the body is connected with the heart through electrodes. 2. The cardiac pacemaker with non-contact power supply function according to claim 1, characterized in that, the internal energy receiving device (11) includes a non-contact power supply secondary coil (14), a rectifier circuit (8), The filter circuit (17) and the electrode interface (10), the non-contact power supply secondary coil (14) is connected to the non-contact power supply primary coil (13) through electromagnetic coupling, the non-contact power supply secondary coil (14) is connected to the rectifier circuit ( 8) are connected to each other, the rectifier circuit (8) is connected to the filter circuit (17), the filter circuit (17) is connected to the electrode interface (10), and the electrode interface (10) is connected to the electrode. 3. The cardiac pacemaker with non-contact power supply function according to claim 1 or 2, characterized in that the external pacemaker circuit (27) includes a signal detection filter circuit (1), a control circuit (12 ), the non-contact power supply primary circuit (7) and the non-contact power supply primary coil (13), the wireless ECG sensor (25) is connected with the signal detection filter circuit (1), and the signal detection filter circuit (1) is connected with the control circuit (12) are connected, the control circuit (12) is connected with the non-contact power supply primary circuit (7), and the non-contact power supply primary circuit (7) is connected with the non-contact power supply primary coil (13). 4. The cardiac pacemaker with non-contact power supply function according to claim 3, characterized in that, the control circuit (12) includes a three-axis gyroscope (2), an A/D conversion circuit (3), a data Processing analysis circuit (4), fatigue degree judgment circuit (5) and output control circuit (6), A/D conversion circuit (3) is connected with signal detection filter circuit (1), three-axis gyroscope (2), A The /D conversion circuit (3) is respectively connected with the data processing and analysis circuit (4), the data processing and analysis circuit (4) is connected with the fatigue degree judgment circuit (5), and the fatigue degree judgment circuit (5) is connected with the output control circuit (6) ), and the output control circuit (6) is connected with the non-contact power supply primary side circuit (7). 5. The cardiac pacemaker with non-contact power supply function according to claim 3, characterized in that, the wireless ECG sensor (25) is installed in a corset garment near the external heart in a wearable manner, non-contact The power supply primary coil (13) and the non-contact power supply secondary coil (14) are installed in parallel under the left shoulder, and the distance between the non-contact power supply primary coil (13) and the non-contact power supply secondary coil (14) is 0.3~0.5 cm, the non-contact power supply primary coil (13) and the non-contact power supply secondary coil (14) transmit magnetic field energy in a non-contact manner. 6. The cardiac pacemaker with non-contact power supply function according to claim 3, characterized in that, the non-contact power supply secondary coil (14) is a coil wound with thin copper enameled wire, and the rectifier circuit ( 8) and filter circuit (17) are chip components. 7. The cardiac pacemaker with non-contact power supply function according to claim 4, characterized in that, its working principle is: the wireless ECG sensor (25) collects the user's ECG signal, and the signal detection filter circuit (1 ) uses the operational amplifier inside to amplify, filter, and raise the voltage of the weak ECG signal to finally generate the waveform of the ECG analog signal; the A/D conversion circuit (3) converts the waveform of the ECG analog signal into a digital signal and sends it to data processing The analysis circuit (4) performs analysis and processing, the fatigue degree judgment circuit (5) judges the state of the heart according to the processing result of the ECG signal, and the output control circuit (6) controls the occupation of the switching device of the non-contact power supply primary side circuit (7). In the empty ratio t _on , the non-contact power supply primary coil (13) transmits energy to the non-contact power supply secondary coil (14), and the internal energy receiving device (11) rectifies and filters the heart through electrodes to perform pacing stimulation. 8. The cardiac pacemaker with non-contact power supply function according to claim 7, characterized in that, the fatigue degree judging circuit (5) judges the method of heart fatigue: measuring the time difference between the peaks of the ECG waveform RR, Calculate the variability characteristics of heart rate, and if the time between RR peaks is greater than the normal time range, it is judged as fatigue. 9. The cardiac pacemaker with non-contact power supply function according to claim 7, characterized in that, the output control circuit (6) controls the duty cycle t of the switching device of the non-contact power supply primary side circuit (7) _on changes the output voltage u _o of the electrode, the output control circuit (6) judges and controls the total power supply time of the non-contact power supply primary side circuit (7) to change the duration of the electrode output voltage u _o , the duration is one ECG The on-stimulation time t _tot of the pulse. 10. The cardiac pacemaker with non-contact power supply function according to claim 7, characterized in that the three-axis gyroscope (2) measures the position, movement trajectory and acceleration in six directions of three coordinate axes in three-dimensional space , send the obtained signal to the data processing and analysis circuit (4) for analysis and processing, when the body movement is detected, the output control circuit (6) immediately strengthens the cardiac pacing stimulation signal, increases the voltage amplitude of the stimulation and extends The conduction stimulation time t _tot of the electrocardiographic pulse.