Pedicle screw system

Abstract

The invention relates to the technical field of medical instruments, in particular to a pedicle screw system which comprises a pedicle screw and an in-vitro energy input device. The pedicle screw comprises a screw body and an induction coil arranged on the screw body, and the pedicle screw is used for receiving a magnetic field signal sent by the in-vitro energy input device; the external energy input device comprises an energy transmitting module and a control module, and the external energy input device is used for wirelessly transmitting energy to the induction coil and adjusting magnetic field parameters. An alternating electric field with the frequency of 15-30 Hz and the intensity of 1-5 V / m is formed in bone tissue around a nail channel, and the defects that a traditional pulse electromagnetic field therapy is serious in signal attenuation and inaccurate in action range are overcome based on the Faraday's law of electromagnetic induction and the high-frequency resonance coupling theory.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a pedicle screw system. Background Art

[0002] Osteoporosis is a systemic metabolic bone disease characterized by decreased bone mass and deterioration of trabecular microarchitecture. Its pathological changes lead to a significant increase in bone brittleness, which in turn significantly increases the incidence of fractures. In spinal surgery, osteoporosis patients experience decreased vertebral bone density, which severely compromises the fixation strength and long-term stability of conventional pedicle screws after implantation. Complications such as screw loosening, fusion failure, screw subsidence, and adjacent segment fractures are common, impacting surgical efficacy and recovery.

[0003] Existing treatments for osteoporosis primarily include medication and physical stimulation. While medication can improve bone metabolism, it suffers from issues such as slow onset, poor compliance, and adverse reactions with long-term use. Physical therapies such as pulsed electromagnetic field (PEMF) stimulation and low-intensity pulsed ultrasound (LIPUS) can promote bone healing and bone formation to a certain extent. However, these methods suffer from limitations such as limited penetration depth, significant signal attenuation, and difficulty in precisely controlling the range of action during energy transfer. Furthermore, these methods often require patients to wear external devices for a long period of time after surgery, making them inconvenient to use and leading to poor compliance.

[0004] In the prior art, there have also been attempts to combine electromagnetic stimulation elements with implantable internal fixation devices in order to achieve local bone healing promotion after surgery. However, this type of solution often leads to prolonged operation time and increased infection risk due to the complexity of the implant structure, or it is difficult to form a continuous and controllable stimulation effect in the bone defect area due to unstable electromagnetic parameters and low energy transfer efficiency. In addition, the lack of matching between the implant and the external energy supply device, low energy coupling efficiency, and lack of monitoring means for local temperature rise and safety also limit the clinical promotion and application of this type of technology. Therefore, there is a need for a pedicle screw system that can take into account both spinal mechanical fixation and precise electromagnetic treatment functions, and can achieve safe and efficient energy transfer after surgery, so as to solve the problems of long-term stability and bone healing promotion in osteoporosis patients during spinal internal fixation surgery. Summary of the Invention

[0005] Based on the above problems, the present invention proposes a pedicle screw system.

[0006] The present invention is achieved through the following technical solutions:

[0007] A pedicle screw system comprises a pedicle screw and an extracorporeal energy input device;

[0008] The pedicle screw comprises a screw body and an induction coil arranged on the screw body, and the pedicle screw is used to receive the magnetic field signal emitted by the extracorporeal energy input device;

[0009] The extracorporeal energy input device comprises an energy transmitting module and a control module. The extracorporeal energy input device is used to wirelessly transmit energy to the induction coil and adjust magnetic field parameters.

[0010] Furthermore, an annular groove is provided on the nail body, the annular groove is located below the nail body nut, and the induction coil is provided in the annular groove.

[0011] Furthermore, the induction coil is a copper coil with 50-100 turns. The copper coil is used to receive the high-frequency alternating magnetic field signal emitted by the extracorporeal energy input device and form an alternating electric field with a frequency of 15-30 Hz and an intensity of 1-5 V / m locally on the nail body.

[0012] Furthermore, the outer layer of the induction coil is covered with an insulating coating, and the insulating coating includes a polyimide film and medical silicone.

[0013] Furthermore, a shielding coating is provided at the distal end of the nail body, and the shielding coating is an aluminum oxide coating.

[0014] Furthermore, the energy transmission module is a dual-frequency energy transmission module, which is composed of a high-frequency power supply coil, a high-frequency communication antenna and a power amplifier. The frequency range of the high-frequency power supply coil is 1-5MHz, the frequency of the high-frequency communication antenna is 13.56MHz, and the power amplifier is a Class D power amplifier architecture, and its output power is set corresponding to the operating frequency of the high-frequency power supply coil.

[0015] Furthermore, the control module includes a main control unit, a Bluetooth module and an NFC near-field communication module. The main control unit is used to adjust the output power according to feedback information, the Bluetooth module is used to wirelessly connect to the terminal APP, and the NFC module is used to pair the pedicle screws and the extracorporeal energy input device.

[0016] Furthermore, the extracorporeal energy input device also includes a temperature sensor and an impedance detection module. The temperature sensor is a chip-type NTC thermistor, which is used to detect the temperature of the energy transmission module. The impedance detection module is used to evaluate the energy transmission efficiency in real time to prevent copper coil short circuit and power abnormality.

[0017] Furthermore, the extracorporeal energy input device also includes a power management module, which includes a rechargeable lithium battery, a wireless charging module compatible with the Qi protocol, and a 50mAh supercapacitor backup.

[0018] Beneficial effects of the present invention:

[0019] (1) The pedicle screw system proposed in the present invention forms an alternating electric field with a frequency of 15-30 Hz and an intensity of 1-5 V / m in the bone tissue around the screw channel through electromagnetic induction coupling between the copper coil on the pedicle screw body and an external energy input device. Based on Faraday's law of electromagnetic induction and high-frequency resonant coupling theory, it overcomes the defects of traditional pulsed electromagnetic field therapy such as severe signal attenuation and inaccurate range of action.

[0020] (2) The present invention proposes a pedicle screw system, in which the extracorporeal energy input device adopts a 1-5MHz high-frequency energy supply coil and a high-Q value coil wound with Litz wire, combined with a ferrite core to focus the magnetic field. The energy transmission efficiency is ≥75%, and the penetration depth can reach 0-10cm. This solves the energy attenuation problem caused by tissue impedance in traditional physical therapy. At the same time, the 13.56MHz high-frequency communication antenna and NFC module ensure fast pairing and stable communication between devices, improving the system's compatibility and ease of operation.

[0021] (3) The pedicle screw system proposed in the present invention supports multiple treatment positions and dynamically adjusts the magnetic field parameters through the control module of the extracorporeal energy input device and the mobile phone APP to meet different clinical needs, such as promoting bone healing, alleviating postoperative inflammation and improving local blood circulation, thereby improving the treatment effect;

[0022] (4) The present invention proposes a pedicle screw system, in which the pedicle screw is made of medical titanium alloy and covered with a nano-hydroxyapatite coating on the surface to enhance bone integration ability; the outer layer of the copper coil is coated with a polyimide film and a medical silicone insulation coating, and an aluminum oxide shielding coating is provided at the distal end of the screw to effectively prevent body fluid corrosion, short circuit and electric field diffusion, reduce the risk of interference with peripheral nerve tissue, and ensure the safety of long-term implantation;

[0023] (5) The present invention proposes a pedicle screw system, in which the extracorporeal energy input device is a belt-type wearable design that is ergonomic, lightweight, and has an IP54 waterproof rating, making it suitable for daily wear. The built-in temperature sensor and impedance detection module monitor the temperature and energy transmission efficiency of the treatment area in real time. If the temperature exceeds 39°C or power anomalies occur, the system automatically pauses and alarms to ensure safe use. The Bluetooth module is linked to the mobile phone APP to support treatment parameter settings, data visualization, and telemedicine support, thereby improving the convenience of patient use and the efficiency of doctor treatment management;

[0024] (6) The present invention proposes a pedicle screw system with an external energy input device equipped with a 3000mAh rechargeable lithium battery, which supports 6-8 hours of continuous operation, is compatible with Qi protocol wireless charging, and has a built-in 50mAh supercapacitor backup to ensure treatment data preservation and safe shutdown in the event of power outages. The power amplifier with a Class D amplifier architecture achieves efficient energy conversion and extends the device's battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic diagram of the pedicle screw structure of a pedicle screw system proposed in the present invention;

[0027] Figure 2 A schematic diagram of an extracorporeal energy input device for a pedicle screw system proposed in the present invention;

[0028] Figure 3 A schematic diagram of the working principle of a pedicle screw system proposed in the present invention;

[0029] In the figure, 1-pedicle screw, 2-screw body, 3-induction coil. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0031] Example 1

[0032] refer to Figure 1-Figure 3 , this embodiment provides an implementation solution for a pedicle screw system.

[0033] This embodiment provides a pedicle screw system, including a pedicle screw 1 implanted in the patient's vertebral body and an extracorporeal energy input device used in conjunction therewith, which can provide wireless energy transmission to the induction coil 3 in the screw after surgery, so as to generate an alternating magnetic field of specific frequency and intensity locally, thereby physically stimulating the bone tissue, promoting bone formation and increasing bone density around the screw channel.

[0034] The pedicle screw 1 described in this embodiment is made of the medical titanium alloy Ti-6Al-4V. This titanium alloy has excellent biocompatibility and high mechanical strength, providing reliable mechanical support within the vertebral body of osteoporosis patients. The screw surface is coated with a nano-hydroxyapatite coating, formed via a plasma spray process. This coating promotes bone cell adhesion and bone integration, helping to shorten the postoperative bone integration period and enhance the long-term stability of fixation.

[0035] An annular groove is provided under the nut. The diameter and depth of the annular groove are precisely designed according to the screw specifications and are used to embed the induction copper coil. The copper coil is wound with highly conductive copper wire with 50 to 100 turns. The diameter after winding is precisely matched with the outer diameter of the screw body 2 to ensure that the coil does not protrude from the screw surface in the implanted state, thereby avoiding additional damage to the vertebral body during surgery or interference with surrounding tissues after surgery.

[0036] The copper coil is used to receive high-frequency alternating magnetic field signals from an extracorporeal energy input device, and form an alternating electric field with a frequency of 15Hz to 30Hz and an intensity of 1V / m to 5V / m locally on the screw. The frequency and intensity can be adjusted according to different treatment needs to achieve various physical therapy functions such as osteoporosis treatment, postoperative anti-inflammatory and local physical therapy.

[0037] Specifically, in this implementation, a high-frequency magnetic field of 1-5 MHz generated by an external transmitter induces eddy currents in the copper coil of the screw. When this current flows through bone tissue, due to the tissue impedance of approximately 50-200 Ω•m, it spontaneously generates an extremely low-frequency 15-30 Hz secondary electric field of 1-5 V / m. This implementation process is based on the capacitive properties of bone tissue, which causes the high-frequency current to lag in phase, resulting in low-frequency modulation caused by the cell membrane polarization effect. Frequency conversion is achieved by utilizing the natural filtering properties of biological tissue. That is, when the high-frequency 1-5 MHz magnetic field penetrates the tissue, its high-frequency component is greatly attenuated due to the skin effect and dielectric loss. The remaining energy is naturally converted into an extremely low-frequency 15-30 Hz electric field with therapeutic effects through the nonlinear impedance characteristics of the bone-metal interface. Experiments have shown that when a composite waveform with a dominant 20 Hz component is used, osteoblast activity is significantly enhanced.

[0038] The attenuation of high-frequency magnetic fields of 1-5 MHz in bone tissue follows the skin depth formula:

[0039] ;

[0040] in (angular frequency), is the magnetic permeability, is the electrical conductivity (bone tissue is about 0.02 S / m), and the calculated value is 1MHz. , at 5MHz , indicating that high-frequency components are greatly attenuated when penetrating tissue.

[0041] The remaining energy is converted into a low-frequency electric field through the nonlinear impedance (capacitive characteristics) of the bone-metal interface. The equivalent circuit model is:

[0042] ;

[0043] in is the cell membrane capacitance (about 1 μF / cm 2), resulting in phase lag and generating a low-frequency modulation signal. The experimentally measured secondary electric field frequency is 15-30Hz and the intensity is 1-5V / m, satisfying: .

[0044] In this embodiment, implantable energy conversion is used, that is, 1-5 MHz high-frequency magnetic field is emitted from the body → the copper coil of the implanted screw receives the conversion → 15-30 Hz low-frequency electric field (1-5 V / m) is generated in the bone tissue around the screw. The field distribution is highly localized, and the electric field is mainly concentrated in the range of 3-5 mm around the screw (through The cutting-edge shielding layer enables precise control), and the magnetic field intensity decays with distance at a rate of 1 / r³ (r is the distance from the center of the screw). The in vitro high-frequency magnetic field (1-5MHz) can penetrate 5-10cm of tissue, and the converted low-frequency electric field acts only on the target bone tissue. Energy utilization is ≥75% (based on the principle of resonant coupling), achieving targeted treatment while avoiding affecting non-target tissues. It is particularly suitable for local anti-osteoporosis treatment after surgery. Penetration depth is controllable: The high-frequency magnetic field of 1-5MHz emitted in vitro can penetrate 5-10cm of tissue (with minimal skin effect), but the converted low-frequency electric field acts only on bone tissue adjacent to the screw, avoiding affecting nerves or blood vessels.

[0045] Traditional external direct energy sources (PEMF / TMS) have a wide range of action but significant attenuation. External PEMF (e.g., 20 Hz, 1-2 mT) attenuates to 0.1-1 V / m in bone tissue, with limited penetration depth. High frequencies (>1 MHz) have a penetration depth of <3 cm in bone tissue, exhibit nonspecific effects, and may affect non-target tissues, resulting in clinical limitations. Their energy efficiency is <30%, requiring higher power (50-100 W) to compensate for energy loss. To more intuitively demonstrate the differences in these technologies, a comparison of key parameters is shown in Table 1.

[0046]

[0047] Table 1

[0048] In this embodiment, the copper coil is coated with a medical-grade insulating material, preferably a polyimide film and a medical silicone composite coating. The polyimide film effectively prevents metal corrosion caused by infiltration of bodily fluids and exhibits high heat resistance and dielectric strength. The medical silicone layer provides additional flexible cushioning and biosafety, preventing direct contact between the coil and surrounding tissue, thereby reducing the risk of short circuits or electric shock injuries after implantation. A shielding coating of aluminum oxide is applied to the distal end of the screw, effectively shielding the screw tip from magnetic field radiation, preventing local magnetic fields from interfering with the spinal cord, nerve roots, or other sensitive tissues.

[0049] The extracorporeal energy input device used in conjunction with the pedicle screw 1 is used to wirelessly power the copper coil implanted in the screw and to intelligently adjust the frequency and intensity of the magnetic field. The extracorporeal energy input device uses lightweight medical-grade ABS plastic or aluminum alloy shell, and the shell surface is covered with a non-slip silicone layer, which improves the wearing comfort and friction stability while maintaining the structural strength. The input device adopts a flat structure design that fits the curve of the human back, with a thickness of no more than 15mm, and is fixed to the patient's clothing or skin surface through elastic straps or magnetic patches, which can be stable and not easily displaced during daily activities. The device meets the IP54 standard for protection, is resistant to sweat and dust, and is suitable for long-term use by patients in their daily lives.

[0050] The extracorporeal energy input device is internally provided with an energy emission module, which includes a high-frequency emission coil and a power amplifier. The high-frequency emission coil is wound with Litz wire, with a diameter of 50-80mm and 10-20 turns, and a working frequency range of 13.56MHz, which matches the resonant frequency of the implanted screw copper coil to achieve efficient energy coupling. The emission coil is built-in with a ferrite core to enhance the focusing ability of the magnetic field, making the energy transmission efficiency reach more than 75% within a range of 0-10cm. The power amplifier uses a class-D power amplifier circuit design, with an output power range of 10-20W adjustable, and an electrical energy conversion efficiency of more than 90%. The power amplifier supports dynamic power adjustment, which can automatically match the output power according to the treatment gear, such as setting 15W output in the osteoporosis treatment gear and 10W output in the anti-inflammatory gear, to meet different biological stimulation needs.

[0051] The control and communication module is composed of a low-power micro control unit (MCU), preferably using an STM32 series chip, which can integrate and run treatment logic algorithms, collect sensor data in real time, and automatically adjust the output frequency and intensity according to feedback parameters. The control module is built-in with a Bluetooth communication module, supporting BLE 5.0 protocol, and realizing two-way communication with the mobile phone application, which can transmit treatment status, energy intensity, remaining treatment time and abnormal alarm information. The control module also integrates NFC near-field communication function, with a working frequency of 1-5MHz, which can quickly complete the pairing of the implanted screw and the extracorporeal energy input device during surgery, verify device compatibility and ensure frequency matching, avoiding postoperative energy transmission failure.

[0052] The system in this embodiment also includes a power management module with a built-in rechargeable lithium battery with a capacity of 3000mAh. At full power output, it can operate continuously for 6 to 8 hours. The charging interface uses a standard USB-C interface and supports Qi-based wireless charging docks, making it convenient for patients to charge at home. The module also includes a 50mAh supercapacitor to maintain system power in the event of a sudden power outage, preserving the current treatment progress and safely shutting down power output to prevent any adverse effects of downtime on treatment.

[0053] To ensure the safety and reliability of the treatment process, the extracorporeal energy input device is equipped with sensors and safety protection modules. The temperature sensor uses a chip-type NTC thermistor with a temperature detection accuracy of ±0.5°C. It can monitor the temperature of the treatment area in real time. Once the temperature exceeds 39°C, the control module will automatically suspend power output and send an alarm message to the mobile phone application via Bluetooth. The impedance detection circuit can analyze the coil reflection signal to evaluate the current energy transmission efficiency. When the energy coupling efficiency is detected to be lower than the set threshold, the device will prompt the patient to adjust the input position to optimize the energy transfer path. In addition, the hardware circuit also includes overcurrent and overvoltage protection units. When the copper coil short circuits, the power is abnormal, or the voltage exceeds the set safety value, the system will immediately cut off the output to prevent damage to the equipment or thermal damage.

[0054] The extracorporeal energy input device is also equipped with a human-computer interaction interface, including a three-color LED indicator and physical buttons. The three-color LED indicator is used to display different treatment modes, with green representing osteoporosis treatment mode, yellow representing anti-inflammatory mode, and red representing local physiotherapy mode. The physical buttons include a power switch and a gear shift button. The gear shift button supports long pressing to enter emergency stop mode to deal with emergencies. The device has a built-in micro vibration motor, which will vibrate to alert the patient when the treatment is completed or an abnormality occurs.

[0055] By integrating with a mobile app, the extracorporeal energy input device enables visualization and remote management of treatment parameters. Patients can use the app to adjust the output frequency, intensity, and treatment duration. The default treatment time is 30 minutes per session, and customized treatment plans can be customized based on the doctor's recommendations. The app displays the current energy transmission efficiency, remaining treatment time, and historical treatment records in real time. Treatment data can also be uploaded to the cloud for remote review and adjustment by doctors.

[0056] During use, the energy input device can select different gears based on treatment needs. The osteoporosis treatment mode uses an alternating electric field with a fixed frequency of 20Hz and an intensity of 3V / m to increase bone density around the screw; the anti-inflammatory mode uses a low-frequency stimulation mode of 15Hz and an intensity of 1V / m to relieve postoperative inflammatory reactions; the local physiotherapy mode uses a high-frequency output mode of 30Hz and an intensity of 5V / m to promote blood circulation and metabolism in the surgical area. During operation, the device's temperature sensor continuously monitors local temperature rise. When the temperature exceeds 39°C, it automatically suspends output and issues an alarm. Treatment can resume after the temperature returns to a safe range.

[0057] Through the coordination of these structures and functions, the pedicle screw system ensures efficient, safe, and controllable local physical stimulation after surgery while maintaining spinal fixation mechanical properties. This provides stable internal fixation support and adjunctive treatment for osteoporosis patients. Through efficient wireless energy transmission and precise frequency and intensity control, this system overcomes the limitations of traditional physical therapy, such as limited penetration depth, significant energy attenuation, and poor compliance. It also avoids the infection risks and increased surgical complexity associated with direct implantation of large electromagnetic devices into the human body, demonstrating promising clinical application prospects.

[0058] Example 2

[0059] This embodiment proposes a specific usage of the pedicle screw system based on the embodiment 1.

[0060] In this embodiment, the operating principle of the pedicle screw system is based on Faraday's law of electromagnetic induction and resonant coupling theory. The high-frequency energy supply coil of the extracorporeal energy input device generates a high-frequency alternating magnetic field of 1-5 MHz. After penetrating the tissue, it undergoes magnetic resonance coupling with the copper coil of the pedicle screw 1. The energy transmission efficiency is ≥75% and the effective distance is 0-10 cm. The high-frequency magnetic field induces eddy currents in the copper coil. Due to the nonlinear impedance characteristics of bone tissue, the high-frequency signal is naturally converted into a low-frequency secondary electric field (frequency 15-30 Hz, intensity 1-5 V / m, error ±0.2 V / m).

[0061] The working process is as follows:

[0062] Assess the patient's vertebral bone density using X-ray or CT scans to select the implant location. Check the charge level of the external energy input device (≥50%) and scan the QR code in the app to bind the device (enter the screw serial number).

[0063] Implant the screws according to standard spinal fixation surgery, ensuring the nut is exposed. Use the NFC module to touch the nut to verify the coil function (beep prompt).

[0064] The patient wears the energy input device on the back, close to the screw position (vibration indicates successful positioning). Select the treatment gear through the APP:

[0065] Osteoporosis treatment block: frequency 20Hz, intensity 3V / m, duration 30 minutes / time, 2 times / day. Stimulate osteoblast activity and improve bone density; Anti-inflammatory block: frequency 15Hz, intensity 1V / m, duration 20 minutes / time, 3 times / day (1-2 weeks after operation). Relieve inflammation and promote healing; Local physiotherapy block: frequency 30Hz, intensity 5V / m, duration 15 minutes / time, use as needed. Improve blood circulation and relax muscles.

[0066] APP real-time display of transmission efficiency, remaining time and temperature. If the temperature > 39℃, the system will automatically pause and alarm.

[0067] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pedicle screw system, characterized in that: Including pedicle screws and extracorporeal energy input device; The pedicle screw comprises a screw body and an induction coil arranged on the screw body, and the pedicle screw is used to receive the magnetic field signal emitted by the extracorporeal energy input device; The extracorporeal energy input device comprises an energy transmitting module and a control module. The extracorporeal energy input device is used to wirelessly transmit energy to the induction coil and adjust magnetic field parameters.

2. A pedicle screw system according to claim 1, characterized in that: An annular groove is provided on the nail body, the annular groove is located below the nail body nut, and the induction coil is arranged in the annular groove.

3. A pedicle screw system according to claim 2, characterized in that: The induction coil is a copper coil with 50-100 turns. The copper coil is used to receive the high-frequency alternating magnetic field signal emitted by the extracorporeal energy input device and form an alternating electric field with a frequency of 15-30 Hz and an intensity of 1-5 V / m locally on the nail body.

4. The pedicle screw system according to claim 1, characterized in that: The outer layer of the induction coil is covered with an insulating coating, and the insulating coating comprises a polyimide film and medical silica gel.

5. The pedicle screw system according to claim 1, characterized in that: The distal end of the nail body is provided with a shielding coating, which is an aluminum oxide coating.

6. The pedicle screw system according to claim 1, characterized in that: The energy transmission module is a dual-frequency energy transmission module, which consists of a high-frequency energy supply coil, a high-frequency communication antenna and a power amplifier. The frequency range of the high-frequency energy supply coil is 1-5MHz, the frequency of the high-frequency communication antenna is 13.56MHz, and the power amplifier is a Class D power amplifier architecture, and its output power is set corresponding to the operating frequency of the high-frequency energy supply coil.

7. The pedicle screw system according to claim 1, characterized in that: The control module includes a main control unit, a Bluetooth module and an NFC near-field communication module. The main control unit is used to adjust the output power according to feedback information, the Bluetooth module is used to wirelessly connect to the terminal APP, and the NFC module is used to pair the pedicle screws and the extracorporeal energy input device.

8. The pedicle screw system according to claim 1, characterized in that: The extracorporeal energy input device also includes a temperature sensor and an impedance detection module. The temperature sensor is a chip-type NTC thermistor, which is used to detect the temperature of the energy transmission module. The impedance detection module is used to evaluate the energy transmission efficiency in real time to prevent the copper coil from short-circuiting and power anomalies.

9. The pedicle screw system according to claim 1, characterized in that: The extracorporeal energy input device also includes a power management module, which includes a rechargeable lithium battery, a wireless charging module compatible with the Qi protocol, and a 50mAh supercapacitor backup.

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