CN107362449A - A kind of radio communication circuit structure and method applied to Implanted cardiac pacemaker - Google Patents

Abstract

The invention discloses a special wireless communication circuit structure and method for implantable cardiac pacemakers. In the functional device; the functional device implanted in the body can transmit the hardware information, various parameters, battery status, stored data and ECG data detected by the special circuit of the cardiac pacemaker stored in the MCU to the external program control instrument through the wireless communication circuit . The circuit structure can meet the following characteristics: the communication distance with the external program controller is greater than 10cm when passing through the human body and the titanium shell; The standby power consumption of the circuit is extremely low; the working power consumption of the communication circuit can meet the normal life requirements of the pacemaker; at a body fluid ambient temperature of 37°C, the surface temperature of the titanium shell rises less than 2°C after continuous communication for 0.5 hours.

Description

A wireless communication circuit structure and method applied to implantable cardiac pacemaker

technical field

The invention belongs to the field of biomedical application-specific integrated circuits, and in particular relates to a wireless communication circuit structure applied to implantable cardiac pacemakers.

Background technique

An implantable cardiac pacemaker is an implanted medical device whose working environment is inside the human body. It is usually required that these devices have sufficient information processing capabilities to provide data telemetry. Now, with the development of engineering technology, most of the implantable devices around the world can be programmed in the body by an external program controller to obtain better working efficiency. Implantable cardiac pacemakers are powered by a single non-replaceable battery, generally required to be able to work continuously in the human body for 10 years or more, and must have extremely low power consumption to prolong the service life and reduce heat dissipation. In addition, in order to reduce the patient's discomfort, the chip area in the implantable cardiac pacemaker should be as small as possible. Therefore, this circuit system requires the use of large scale integrated circuit technology, advanced wireless technology and power management technology.

The telemetry function and data transmission function of the currently used implantable cardiac pacemaker are generally completed by the two-way communication between the pacemaker and the external programmer.

The current wireless communication circuits of implantable cardiac pacemakers are generally constructed using FPGA and discrete components. Compared with using fully customized ASICs, the disadvantages are low integration, larger area, higher power consumption, and no advantage in performance. , which has the advantage of shorter development time and lower cost.

In the existing communication methods of implantable devices, the information is modulated and loaded onto the coil, and then transmitted through resonance demodulation. The communication circuit in the present invention performs data transmission through coil coupling and mutual inductance, and the receiving end in the body does not need a demodulation circuit, which further reduces the complexity and power consumption of the circuit.

During the process of the pacemaker transmitting ECG data to the program-controlled instrument, the ECG signals collected by the electrodes are collected by the relevant circuits of the ASIC and sent to the MCU for analysis. In the existing pacemaker scheme, the data is processed by the MCU and sent through the transmitting tube and the coil. During the transmission of the ECG data, the MCU generates a lot of heat, and the patient will feel obvious discomfort.

Contents of the invention

The purpose of the present invention is to meet various current functional requirements, provide a wireless communication circuit structure and method applied to implantable cardiac pacemakers, overcome the area, The problem of power consumption, as well as the heating problem of transmitting ECG data in existing schemes, provide a set of feasible communication circuit module structure for implantable cardiac pacemaker ASIC.

In order to achieve the above object, the present invention adopts the following technical solutions.

A wireless communication circuit structure applied to an implantable cardiac pacemaker, including a wireless communication circuit, the wireless communication circuit includes a filter module, an amplifier module, a hysteresis comparator module, a waveform shaping module, a synchronization module, a decoding module, The wake-up circuit module, the transmitting tube module, the communication coding module, the hybrid coding module, and the internal coil L; the external program controller is coupled and connected through the external coil L and the internal coil L, and the internal coil L is sequentially connected to the filter module, the amplifier module, the hysteresis comparator module, The waveform shaping module, the waveform shaping module is connected to the MCU module through the synchronization module, the decoding module and the wake-up circuit module respectively; the MCU module transmits the MCU message to the wireless communication circuit module through the communication encoding module, the transmitting tube module, and the internal coil L in turn, The external coil L is transmitted to the external program-controlled instrument; the ASIC module is connected to the heart to collect ECG data, and then transmitted to the MCU module; the wireless communication module collects the ECG data of the ASIC module and the MCU module and connects with the communication coding module through the hybrid coding module in turn .

The emitter module is a bipolar transistor or MOSFET.

The filtering module is a passive filtering structure or an active filtering structure.

The internal coil L is a special-shaped hollow coil wound along the inner side of the titanium shell of the implantable cardiac pacemaker.

Except for the internal coil L, the wireless communication modules are in the form of integrated circuits.

When the wireless communication circuit adopts a 0.35 μm process, the maximum working current is less than 50 μA.

The wireless communication circuit uses a 32K crystal oscillator clock signal, and the highest transmission rate from the wireless communication circuit to the program-controlled instrument is 8.192kbps.

Among them, the communication coil (coil L1 inside the body and coil L2 outside the body) is connected to the external program controller for two-way data transmission through coupling mutual inductance, and the output of the communication coil is connected to the input of the filter circuit. Since there is no carrier, the receiving end in the body does not need a demodulation circuit , further reducing the complexity and power consumption of the circuit;

The filter circuit is opened when the program-controlled instrument transmits data to the communication circuit. Its input is the communication coil, and its output is the input terminal of the amplifier. The filter circuit removes the clutter in the signal received by the coil and leaves a useful signal;

The amplifier is turned on when the program-controlled instrument transmits data to the communication circuit and when the communication circuit transmits ECG data to the program-controlled instrument, and receives synchronous data. Its input comes from the output of the filter circuit. The amplifier amplifies the filtered signal amplitude and converts It is converted into a differential signal, and the differential signal is output to the input terminal of the hysteresis comparator;

The hysteresis comparator is turned on when the program-controlled instrument transmits data to the communication circuit and the communication circuit transmits ECG data to the program-controlled instrument, and when it receives synchronous data, its input comes from the output of the amplifier. The signal is converted into a digital signal, and the digital signal is output to the waveform shaping circuit;

The waveform shaping circuit is opened when the program-controlled instrument transmits data to the communication circuit and the communication circuit transmits ECG data to the program-controlled instrument, and when receiving synchronous data, its input comes from the output of the hysteresis comparator. The digital signal output by the device is shaped into a digital signal with a standard pulse width, which is output to the decoding circuit, synchronization circuit and wake-up circuit;

The decoding circuit is turned on when the program-controlled instrument transmits data to the communication circuit, and its input comes from the output of the waveform shaping circuit. The decoding circuit is used to complete the transformation of the digital signal output by the waveform shaping circuit from communication encoding to data encoding, and output to the communication The pacemaker outside the circuit has a built-in MCU;

The synchronization circuit is turned on when the communication circuit transmits ECG data to the program-controlled instrument, and its input terminal is connected to the output terminal of the waveform shaping circuit. The synchronous circuit is used to receive and identify the synchronous signal emitted by the external program-controlled instrument, and to control the working state of the communication circuit function;

The wake-up circuit is turned on when the communication circuit is in a dormant state, and its input terminal is connected to the output terminal of the waveform shaping circuit. The wake-up circuit is used to receive and identify the wake-up signal emitted by the external program controller, and has the function of opening the communication circuit to make it work;

The hybrid encoding circuit is turned on when the communication circuit transmits ECG data to the program-controlled instrument. Its input is the ECG signal collected by the ASIC and the event mark from the MCU. The hybrid encoding circuit adds the ECG information to the event marker bit, check bit, The start bit and the stop bit are output to the communication coding circuit;

The communication encoding circuit is turned on when the communication circuit transmits ECG data and hardware information stored in the MCU, various parameters, battery status, storage data and other data to the program controller, and its input is the output of the hybrid encoding circuit and the corresponding MCU The output serial port, the communication encoding circuit converts the input signal from information code into communication code, and then outputs it to the transmitting tube;

The launch tube is turned on when the communication circuit transmits ECG data and hardware information stored in the MCU, various parameters, battery status, storage data and other data to the program-controlled instrument. Its input is the output of the communication encoding circuit. The function of the launch tube is By controlling the current break on the communication coil, the data to be sent to the programmer is loaded on the communication coil.

A control method applied to a wireless communication circuit structure of an implantable cardiac pacemaker, comprising the following steps:

1) Exchanging data: use the external program controller to continuously send a specific wake-up signal to the wireless communication circuit through the coupling between the external coil L and the internal coil L; after the wake-up signal is received by the internal coil L and enters the wireless communication circuit, it is filtered sequentially module, amplifier module, hysteresis comparator module, waveform shaping module, and wake-up circuit module, which convert the entire wireless communication circuit from the sleep state to the wake-up state, and notify the MCU module in the body at the same time; The encoding module, the transmitting tube module, and the coil L in the body transmit the pacemaker verification information out of the wireless communication circuit module, and after being received by the external program controller through the external coil L, the wireless communication circuit module enters the internal receiving working mode; the program controller module will The previously received verification information is sequentially transmitted to the MCU module through the external coil L, the internal coil L, the filter module, the amplifier module, the hysteresis comparator module, the waveform shaping module, and the decoding module. After the MCU module receives the verification information and confirms that it is correct, Repeat the verification process of sending and receiving above again, if the verification is correct, the communication is successfully established, otherwise the wireless communication circuit module will return to the dormant state after waiting for a period of time;

2) ECG data transmission: the ASIC module collects the ECG data from the heart, and then transmits it to the MCU module; the MCU module stops the data transmission with the wireless communication circuit module, generates an event mark according to the ECG data received from the ASIC module, and sends The event marker bit is stored in the register; the wireless communication module regularly collects ECG data from the ASIC module and event markers from the MCU module, passes the collected ECG data and event markers through the mixed encoding module, enters the communication encoding module and compiles them into a communication The code is loaded onto the internal coil L through the transmitting tube module, and is received by the external program control instrument module through coupling with the external coil L to complete the general transmission process of ECG data;

3) Dormant state: every time the ECG data is sent a certain number of times, the wireless communication circuit module opens the receiving channel to receive the synchronization signal from the program controller module. After the synchronization signal comes out of the waveform shaping module, it enters the synchronization module for synchronization confirmation. Electrical data transmission working mode, otherwise the wireless communication circuit module enters the dormant working mode.

Compared with the prior art, the present invention has the following advantages:

The invention provides an application-specific integrated circuit communication module applied to implantable cardiac pacemakers, which includes a complete receiving and sending path, and directly encodes and decodes pulses sent and received to meet the communication rate requirements. A solution with low power consumption and low bit error rate. Under the pacemaker structure where ASIC and MCU work together, the communication circuit module in the present invention has functions such as codec function, automatic wake-up function, automatic transmission of ECG data and synchronous verification, which greatly reduces the work of MCU. burden, so that the power consumption and heat generation of the MCU are well suppressed in the process of communicating with the external programmer.

Furthermore, the implantable cardiac pacemaker mainly includes functional modules such as electrodes, application-specific circuits (ASICs), microcontrollers (MCUs), and dedicated wireless communication circuits. The structure is simple and compact. Power consumption and area can be well controlled, the service life of the pacemaker is prolonged, and the cost of a single chip is reduced. The circuit structure in the present invention realizes most of the logic functions through the special circuit, so that the calorific value of the built-in MCU is greatly reduced, and the patient's discomfort is reduced. The circuit structure can meet the following characteristics: the communication distance with the external program controller is greater than 10cm when passing through the human body and the titanium shell; The standby power consumption of the circuit is extremely low; the working power consumption of the communication circuit can meet the normal life requirements of the pacemaker; at a body fluid ambient temperature of 37°C, the surface temperature of the titanium shell rises less than 2°C after continuous communication for 0.5 hours.

Further, the transmission process of the present invention does not depend on the carrier, so the receiving and transmitting process is very simple, and the analog circuit side does not need to demodulate and modulate the signal, only need to recover the waveform and control the disconnection of the transmitting tube. Therefore, the circuit structure of the present invention is simpler, and the power consumption and area are greatly reduced. The maximum current of the wireless communication circuit structure in the present invention is less than 50 μA when working in a 0.35 μm process.

The control method of the present invention includes three working states: data exchange, ECG data transmission and sleep state; the external program controller can transmit the preset parameters to the functional device implanted in the body through the communication circuit; the functional device implanted in the body can The hardware information stored in the MCU, various parameters, battery status, stored data, and the ECG data detected by the special circuit of the cardiac pacemaker are transmitted to the external program control instrument through the wireless communication circuit. The communication rate of the control process of the present invention is high, the structure is stable, the anti-noise and interference ability are strong, and the communication function requirements of the implantable cardiac pacemaker can be well met, and the structure can share most of the logic functions of the MCU in the communication process , reducing the calorific value of the pacemaker system, and at the same time, the circuit structure is simple, the power consumption is low, the battery life is prolonged, and the cost is reduced.

Description of drawings

Fig. 1 is a schematic structural diagram of a wireless communication circuit described in the present invention;

Fig. 2 is a schematic diagram of the encoding rules of the hybrid encoding circuit module described in the present invention;

FIG. 3 is a schematic diagram of the relationship between data codes and communication codes described in the present invention.

detailed description

Implantable cardiac pacemakers are powered by batteries and are required to work continuously in the human body for more than ten years. They are very sensitive to the power consumption of the circuit. Therefore, the circuit structures provided in the present invention are all designed and implemented in a low-power consumption manner. The invention has complete functions and simple circuit structure, can well control power consumption and area, prolongs the service life of the pacemaker, and reduces the cost of a single chip. The circuit structure in the present invention realizes most of the logic functions through the special circuit, so that the calorific value of the built-in MCU is greatly reduced, and the patient's discomfort is reduced.

The circuit structure in the present invention not only realizes communication at a higher data transmission rate, but also controls the bit error rate in the communication process by suppressing noise and clutter. The circuit structure in the present invention is a stable communication state machine.

The present invention will be described in further detail below in conjunction with the accompanying drawings. In the following description, the key role played by each module of the circuit in the overall circuit structure is emphasized. The function of the description of the circuit communication method is to further explain the function of the circuit structure by describing the circuit working mode, but it is not the present invention. focus, so not all communication states will be fully described here.

Referring to FIG. 1 , a wireless communication circuit structure applied to an implantable cardiac pacemaker according to the present invention includes a wireless communication circuit 01 . The wireless communication circuit 01 includes a filtering module 010, an amplifier module 011, a hysteresis comparator module 012, a waveform shaping module 013, a synchronization module 014, a decoding module 015, a wake-up circuit module 016, a transmitting tube module 017, a communication encoding module 018, Hybrid encoding module 019 and body coil L1.

The wireless communication circuit is usually in a dormant state. In the dormant state, the wake-up function module of the wireless communication circuit is turned on intermittently to listen to whether there is a wake-up command from the external program controller. The power consumption of this working mode is very low. Under the condition of 32K crystal oscillator clock, the current is less than 10nA.

When the doctor needs to establish communication to exchange data, the external programmer 2 is used to continuously send a specific wake-up signal to the wireless communication circuit 01 through the coupling of the external coil L2 and the internal coil L1. After the wake-up signal is received by the coil L1 in the body and enters the wireless communication circuit 01, it passes through the filter module 010, the amplifier module 011, the hysteresis comparator module 012, the waveform shaping module 013 and the wake-up circuit module 016 in sequence, and the whole wireless communication circuit 01 is turned from the sleep state Transition to the wake-up state, and notify the MCU module 03 in the body at the same time. Next, the MCU module 03 enters the internal transmission working mode. The specific process is that the MCU module 03 transmits the pacemaker verification information to the wireless communication circuit module 01 through the communication encoding module 018, the transmitting tube module 017, and the internal coil L1 in sequence, and passes through the external coil. After L2 is received by the external program controller 2, the wireless communication circuit module 01 enters the internal receiving mode, and the program controller module 2 passes the verification information received before through the external coil L2, the internal coil L1, the filter module 010, the amplifier module 011, The hysteresis comparator module 012, the waveform shaping module 013, and the decoding module 015 are transmitted to the MCU module 03. After the MCU module 03 receives the verification information and confirms that it is correct, it repeats the above-mentioned verification process of sending and receiving. If the verification is correct, Then the communication is successfully established, otherwise the wireless communication circuit module 01 returns to the dormant state after waiting for a period of time.

The working mode of the wireless communication module 01 after it wakes up and successfully establishes communication is controlled by the MCU module 03, and the working mode that the MCU module 03 allows the wireless communication module 01 to be in depends on the message sent by the programmer module 2 received by the MCU module 03. mode control command to decide. The wireless communication module 01 has three working modes in total, including the in-body sending mode, the in-vivo receiving mode and the ECG data transmission mode. Since the control of the working mode of the wireless communication module 01 is performed by the MCU module 03, the in-body In the sending and receiving working modes in the body, the function performed by the wireless communication module 01 is no different from the transmission of verification information during the wake-up phase, which is equivalent to the data transmission and analysis path from the MCU module 03 to the in vitro program controller module 2, where the in vivo The working mode of receiving is equivalent to the working process in which the in vitro program controller module 2 sends the received verification information to the MCU module 03, and the working mode of in vivo sending is equivalent to the working process in which the MCU module 03 sends the verification information to the in vitro program controlling device module 2.

If the doctor wants the internal device circuit module 0 to transmit ECG data, he can send an instruction to the MCU module 03 through the internal receiving mode to switch the working mode of the wireless communication circuit module 01 to the ECG data transmission mode. In this working mode, the ASIC module 02 collects the ECG data from the heart 1, and then transmits it to the MCU module 03; the MCU module 03 stops the data transmission with the wireless communication circuit module 01, and according to the ECG data received from the ASIC module 02 Generate event markers, store event marker bits in registers; wireless communication module 01 regularly collects ECG data from ASIC module 02 and event markers from MCU module 03, passes the collected ECG data and event markers through the hybrid coding module 019 adds the parity bit, start bit and stop bit according to the set rules, enters the communication coding module 018 and compiles it into a communication code, and then loads it to the internal coil L1 through the transmitting tube module 017, and is coupled with the external coil L2 by The in vitro program controller module 2 receives and completes the general transmission process of ECG data. Every time the ECG data is sent a certain number of times, the wireless communication circuit module 01 opens the receiving channel to receive the synchronization signal from the program controller module 2. The reception of the synchronization signal is different from the internal receiving working mode. The synchronization signal enters the synchronization module after it comes out of the waveform shaping module 013 014 for synchronous confirmation, if the confirmation is successful, the ECG data transmission working mode will continue, otherwise the wireless communication circuit module 01 will enter the dormant working mode.

When the wireless communication module needs to receive data at any time, the opened modules include:

The function of the internal coil L1 is to couple the data on the external coil L2 through mutual inductance and provide it to the subsequent circuit;

The filter module 010 is used to receive the electrical signal on the internal coil L1 and filter out other clutter coupled to the coil;

The amplifier module 011 is used to receive the signal after the filter module 010, amplify the signal and convert the single-ended signal into a differential signal, the purpose is to pre-amplify the attenuated signal after filtering, so that the wireless communication module can be as far away as possible The distance can also receive the signal sent by the external program controller, which meets the requirements of the communication distance;

The hysteresis comparator module 012, its role is to receive the differential signal output by the amplifier module 011 and convert it into a single-ended digital signal, the purpose is to complete the conversion from analog to digital, while the hysteresis comparator depends on the specific communication conditions The introduction of a certain amount of hysteresis can well shield the noise signal, prevent bit errors, and improve the anti-interference ability;

The function of the waveform shaping module 013 is to receive the digital signal with a duty cycle offset output by the hysteresis comparator module 012 and convert it into a digital signal with a standard duty cycle.

In the ECG data transmission working mode, in addition to opening the above-mentioned circuit modules that need to be opened for any data reception situation, the synchronization module 014 must also be opened, and its function is to periodically receive the synchronization information sent by the external program controller. The communication module continues the ECG data transmission working mode, and if the reception fails, the wireless communication module exits the ECG data transmission working mode to the dormant state.

In the body receiving mode, in addition to opening the above-mentioned circuit modules that need to be opened in any case of receiving data, the decoding module 015 must also be opened, and its function is to decode the digital signal after being shaped by the waveform shaping circuit module 013 from the communication code into a data code.

When the wireless communication module is in the dormant state to be woken up, in addition to opening the above-mentioned circuit modules that need to be opened in any case of receiving data, the wake-up circuit module 016 is also opened, and its function is to listen to the wake-up signal, and wake up when the wake-up signal is successfully detected. wireless communication circuit.

When the wireless communication module needs to send any data, the opened modules include:

The communication encoding module 018 is used to convert any signal input into the module from data codes to communication codes, and output the communication codes to the transmitting tube module 017;

The transmitting tube module 017 functions to load the communication code encoded by the communication encoding module 018 onto the body coil L1;

The internal coil L1 is used to receive the electrical signal of the transmitting tube module 017, and couple the signal to the external coil L2 through the mutual inductance of the coil.

In the ECG data transmission mode, in addition to opening the above-mentioned modules that need to be opened in any case of sending data, it is also necessary to open the hybrid encoding module 019, whose function is to collect the ECG data collected from the ASIC module 02 and the MCU module 03 The received event marks are integrated, and the start bit, stop bit and check code are added, and then sent to the communication encoding module 018. The schematic diagram of the encoding rule of the mixed encoding module 019 is shown in FIG. 2 .

The emitter module 017 can be a bipolar transistor or a MOSFET.

The filtering module 010 may be a passive filtering structure or an active filtering structure.

As shown in Figure 3, the relationship between the data code and the communication code, through such conversion, the high and low level width information of the data code is converted into information that can be carried on the trigger edge in a single direction, so that the specific pulse waveform generated by inductive coupling The shape will not affect the analyzed signal, so that the error caused by signal analysis during the communication process can be well avoided.

The internal coil L1 is a special-shaped hollow coil wound along the inner side of the titanium shell of the implantable cardiac pacemaker. In the present invention, due to performance and process reasons, it cannot be implemented in a form integrated on a chip.

Except for the internal coil L1, the wireless communication module 01 is realized in the form of a fully customized ASIC, but it is not limited thereto. The present invention proposes a system structure of a wireless communication module, and the scope of this structure is also included in Integrated circuits implemented in other forms. Depending on the performance of the integrated circuit technology, the transmitting tube module 017 and the filtering module 010 may also be implemented in the form of discrete devices.

The highest transmission rate of the wireless communication circuit described in the present invention is determined by the clock signal of the special circuit, and the highest transmission rate of the wireless communication circuit to the program-controlled instrument under the 32K crystal oscillator clock signal is 8.192kbps.

A feature of the present invention that is different from other wireless communication circuit structures suitable for implantable cardiac pacemakers is that the transmission process does not rely on the carrier, so the receiving and sending process is very simple, and the analog circuit terminal does not need to demodulate and modulate the signal, only need Restoring the waveform and controlling the disconnection of the launch tube are enough. Therefore, the circuit structure of the present invention is simpler, and the power consumption and area are greatly reduced. The maximum current of the wireless communication circuit structure in the present invention is less than 50 μA when working in a 0.35 μm process.

In summary, the wireless communication circuit structure proposed in the present invention has a high communication rate, a stable structure, strong anti-noise and interference capabilities, and can well meet the communication function requirements of implantable cardiac pacemakers, and the structure can Sharing most of the logic functions of the MCU in the communication process reduces the calorific value of the pacemaker system. At the same time, the circuit structure is simple, the power consumption is low, the battery life is prolonged, and the cost is reduced.

Claims (8)

1. A wireless communication circuit structure applied to an implantable cardiac pacemaker, characterized in that it includes a wireless communication circuit (01), and the wireless communication circuit (01) includes a filtering module (010), an amplifier module (011 ), hysteresis comparator module (012), waveform shaping module (013), synchronization module (014), decoding module (015), wake-up circuit module (016), launch tube module (017), communication coding module (018) , mixed coding module (019) and internal coil L1; the external program controller (2) is coupled and connected through the external coil L2 and the internal coil L1, and the internal coil L1 is sequentially connected to the filter module (010), the amplifier module (011), and the hysteresis comparator module (012), waveform shaping module (013), and waveform shaping module (013) is connected with MCU module (03) by synchronous module (014), decoding module (015) and wake-up circuit module (016) respectively; MCU module (03) ) through the communication encoding module (018), the transmitting tube module (017), and the internal coil L1 in turn, transmit the MCU message to the wireless communication circuit module (01), and transmit it to the external program controller (2) through the external coil L2; the ASIC module ( 02) Connect with the heart (1) to collect ECG data and transmit it to the MCU module (03); the wireless communication module (01) collects the ECG data of the ASIC module (02) and the MCU module (03) through the hybrid coding module in turn (019) is connected with communication encoding module (018). 2. The wireless communication circuit structure applied to an implantable cardiac pacemaker according to claim 1, characterized in that, the transmitting tube module (017) is a bipolar transistor or MOSFET. 3. The wireless communication circuit structure applied to an implantable cardiac pacemaker according to claim 1, characterized in that, the filter module (010) is a passive filter structure or an active filter structure. 4. The wireless communication circuit structure applied to an implantable cardiac pacemaker according to claim 1, wherein the internal coil L1 is wound along the inner side of the titanium shell of the implantable cardiac pacemaker special-shaped hollow coils. 5. The wireless communication circuit structure applied to an implantable cardiac pacemaker according to claim 1, characterized in that, the wireless communication module (01) is in the form of an integrated circuit except for the internal coil L1. 6. The wireless communication circuit structure applied to implantable cardiac pacemakers according to claim 1, characterized in that, when the described wireless communication circuit (01) adopts a 0.35 μm process, the maximum current during operation is less than 50μA. 7. the wireless communication circuit structure that is applied to implantable cardiac pacemaker according to claim 1, is characterized in that, described wireless communication circuit (01) adopts 32K crystal oscillator clock signal, and wireless communication circuit sends to program-controlled instrument The highest transfer rate is 8.192kbps. 8. A control method applied to a wireless communication circuit structure of an implantable cardiac pacemaker as claimed in claim 1, comprising the following steps: 1) Exchanging data: use the external program controller (2) to continuously send a specific wake-up signal to the wireless communication circuit (01) through the coupling of the external coil L2 and the internal coil L1; the wake-up signal is received by the internal coil L1 and enters the wireless communication After the circuit (01), through the filter module (010), amplifier module (011), hysteresis comparator module (012), waveform shaping module (013) and wake-up circuit module (016), the entire wireless communication circuit (01) Switch from dormant state to wake-up state, and notify the MCU module (03) in the body at the same time; the MCU module (03) enters the internal transmission working mode, and the MCU module (03) sequentially passes through the communication encoding module (018), the transmitting tube module (017), the internal The coil L1 transmits the pacemaker verification information to the wireless communication circuit module (01), and after being received by the external program controller (2) through the external coil L2, the wireless communication circuit module (01) enters the internal receiving mode; the program controller module (2) Pass the previously received verification information through the external coil L2, the internal coil L1, the filter module (010), the amplifier module (011), the hysteresis comparator module (012), the waveform shaping module (013), and the decoding module (015) Transfer to the MCU module (03). After the MCU module (03) receives the verification information and confirms that it is correct, repeat the verification process of sending and receiving above again. If the verification is correct, the communication is successfully established, otherwise the wireless communication The circuit module (01) returns to the dormant state after waiting for a period of time; 2) ECG data transmission: the ASIC module (02) collects ECG data from the heart (1), and then transmits it to the MCU module (03); the MCU module (03) stops data transmission with the wireless communication circuit module (01), According to the electrocardiographic data that receives from ASIC module (02), generate event mark, event mark bit is stored in register; ) event mark, the collected ECG data and event mark pass through the hybrid coding module (019), enter the communication coding module (018) and compile it into a communication code, and then load it into the body coil L1 through the transmitting tube module (017), Received by the external program controller module (2) through coupling with the external coil L2, and complete the general transmission process of the ECG data; 3) Dormant state: every time the ECG data is sent a certain number of times, the wireless communication circuit module (01) opens the receiving channel to receive the synchronization signal from the program controller module (2), and the synchronization signal enters the synchronization module after coming out of the waveform shaping module (013) (014) Carry out synchronous confirmation, if the confirmation is successful, continue the ECG data transmission working mode, otherwise the wireless communication circuit module (01) enters the dormant working mode.