High-frequency current large vessel closer control system powered by battery

Abstract

The invention provides a battery-powered high-frequency current large blood vessel closer control system, which solves the problem of portability of a blood vessel closer and the like, and comprises a battery, the battery is connected with a battery management circuit, the battery management circuit is connected with an inverter booster circuit, and the inverter booster circuit is provided with a front-stage push-pull circuit and a rear-stage full-bridge inverter circuit. The system has the advantages of good portability, high power supply stability and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of surgical equipment, and in particular relates to a battery-powered high-frequency current large blood vessel closure device control system. Background Art

[0002] Existing high-frequency current control systems for vascular sealers primarily consist of a generator, feedback system, and electrodes, working together to effectively seal blood vessels. Most control systems incorporate various safety protection mechanisms, such as overcurrent and overheating protection. Systems like the POWER-420L high-frequency surgical system feature intelligent real-time feedback technology, automatically identifying impedance and terminating power output appropriately. Once tissue is completely coagulated, it automatically cuts off the high-frequency current supply, reducing the risk of tissue damage and complications caused by improper current control. However, in actual use, it still relies on an external energy platform, making it less suitable for environments without access to a power source or outdoors.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document [202210085625.7] discloses a high-frequency electrosurgical knife operation control device and system. During operation, the device uses a least-squares method to fit the output electrical parameters of the tool under the operating state to obtain an optimal voltage curve. The device then obtains the tool's output current parameters and matches them with the optimal voltage curve to dynamically track and adjust the tool's frequency as it changes, thereby maintaining the tool's operating state.

[0004] The above solution solves the problem of current feedback control to a certain extent, but the solution still has many shortcomings, such as being unsuitable for battery-powered control and insufficient portability. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems and provide a battery-powered high-frequency current large blood vessel closure device control system with reasonable design and high portability.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: a battery-powered high-frequency current large blood vessel closure device control system, including a battery, the battery is connected to a battery management circuit, the battery management circuit is connected to an inverter boost circuit, and the inverter boost circuit has a front-stage push-pull circuit and a rear-stage full-bridge inverter circuit.

[0007] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the battery management circuit includes a boost circuit connected to the battery. The boost circuit communicates with the main control circuit via the I2C protocol. The output end of the boost circuit is connected to a current monitoring circuit. The main control circuit performs AD sampling on the current monitoring circuit. A temperature detection circuit is provided between the main control circuit and the battery.

[0008] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the boost circuit includes a TPS55289 boost converter, and the input and output ends of the boost converter are connected to a filter circuit.

[0009] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the main control circuit includes an STM32H750VBT6 MCU module.

[0010] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the current monitoring circuit includes an INA181A1 model current detection amplifier.

[0011] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the temperature detection circuit includes a thermistor of model MCU18XH103D60RB.

[0012] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the front-stage push-pull circuit includes a driver chip of model IXDD604SIA, which is connected to the transformer through a MOS tube of model IRLZ44NSTRLPBF. The transformer uses an EQ125 magnetic core and has a turns ratio of 1 / 5.

[0013] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the rear-stage full-bridge inverter circuit includes an EG8010 model sine wave inverter chip.

[0014] In the above-mentioned battery-powered high-frequency current large blood vessel occluder control system, the power ground and signal ground of the front-stage push-pull circuit and the rear-stage full-bridge inverter circuit are isolated and grounded at a single point.

[0015] In the above-mentioned battery-powered high-frequency current large blood vessel closure control system, the rear-stage full-bridge inverter circuit uses resistor voltage division to access the voltage feedback pin of the sine wave inverter chip.

[0016] Compared with the existing technology, the advantages of the present invention are: the battery management circuit is connected to the inverter boost circuit, and the front-stage push-pull circuit and the rear-stage full-bridge inverter circuit are used to achieve battery boost and high-frequency, high-voltage and low-current signal output, meeting the portable control requirements of the closer battery; the front-stage push-pull circuit and the rear-stage full-bridge inverter circuit adopt a partitioned layout to avoid high-frequency noise coupling, stabilize the signal reference potential, and improve anti-interference ability and system reliability; the overall circuit design achieves small size, large output, high efficiency, and software control, which is suitable for scenarios with strict requirements on performance, reliability and space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present invention;

[0018] Figure 2 is a circuit diagram of a boost circuit of the present invention;

[0019] Figure 3 is a circuit diagram of the main control circuit of the present invention;

[0020] Figure 4 is a circuit diagram of a current monitoring circuit of the present invention;

[0021] Figure 5 is a circuit diagram of a temperature detection circuit of the present invention;

[0022] Figure 6 1 is a circuit diagram of a front-stage push-pull circuit of the present invention;

[0023] Figure 7 1 is a circuit diagram of a rear-stage full-bridge inverter circuit of the present invention;

[0024] In the figure, there are a battery 1, a battery management circuit 2, a boost circuit 21, a main control circuit 22, a current monitoring circuit 23, a temperature detection circuit 24, an inverter boost circuit 3, a front-stage push-pull circuit 31, and a rear-stage full-bridge inverter circuit 32. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-7 Figure 1 shows a battery-powered, high-frequency current large vessel closure device control system. The device includes a battery 1 connected to a battery management circuit 2 for current boosting. The battery management circuit 2 is connected to an inverter-boost circuit 3, which includes a front-stage push-pull circuit 31 and a rear-stage full-bridge inverter circuit 32. Battery power improves device convenience. The front-stage push-pull circuit 31 reduces switching losses, and the high-frequency current from the rear-stage full-bridge inverter circuit 32 rapidly closes blood vessels, minimizing thermal damage.

[0027] Specifically, the battery management circuit 2 includes a boost circuit 21 connected to the battery. This circuit communicates with a main control circuit 22 via the I2C protocol to adapt to load changes. The output of the boost circuit 21 is connected to a current monitoring circuit 23, which the main control circuit 22 samples. A temperature detection circuit 24 is located between the main control circuit 22 and the battery. This battery management circuit 2 employs dual current and temperature monitoring to prevent damage to the device or battery due to overcurrent and overheating.

[0028] The main control circuit 22 can first accurately adjust the duty cycle, frequency and other parameters of the driver chip, MOS tube, etc. of the front-stage push-pull circuit 31 to preliminarily control the output medium-frequency AC characteristics, and then further fine-tune the high-frequency output of the rear-stage according to the voltage, current and other signals fed back by the rear-stage full-bridge inverter circuit 32 (such as obtaining feedback by using a resistor divider to access the voltage feedback pin of the sinusoidal wave inverter chip in the rear stage), so as to achieve precise control of the entire output waveform, power and other aspects from low frequency to high frequency, which is more conducive to adapting to the characteristics of different vascular tissues and the precise energy supply requirements for large blood vessel closure in different surgical scenarios.

[0029] In depth, the boost circuit 21 includes a TPS55289 model boost converter, and the input and output ends of the boost converter are connected to a filter circuit. The boost converter supports a maximum output of 200W (40V / 5A), which is suitable for large current loads. It has built-in MOSFET synchronous rectification, compensation network, soft start and protection circuit, and the efficiency can reach 95%. It is dynamically adjusted through the I2C protocol, significantly reducing conduction loss and temperature rise.

[0030] Furthermore, the main control circuit 22 includes an STM32H750VBT6 model MCU module, and the internal USB bus supports external programming and remote communication control. The MCU module has multiple USB ports to meet the wiring control requirements of the boost circuit 21 and the current monitoring circuit 23, and has low power consumption and high-speed processing capabilities to meet real-time control requirements.

[0031] Furthermore, the current monitoring circuit 23 includes a current detection amplifier of the INA181A1 model, which senses the voltage drop across the current sensing resistor at a common-mode voltage of –0.2V to +26V that is independent of the power supply voltage, and ensures that the circuit output current is within a safe range by detecting the boost output current in real time.

[0032] In addition, to avoid serious heating during boosting, which may cause device burnout, output abnormality, and other problems, the temperature detection circuit 24 includes a thermistor of model MCU18XH103D60RB, which monitors the temperature of the boost circuit 21 and transmits the temperature to the main control circuit 22 in real time.

[0033] The front-stage push-pull circuit 31 includes an IXDD604SIA driver chip, which is connected to the transformer via an IRLZ44NSTRLPBF MOSFET. A current-limiting circuit consisting of a resistor and a diode in parallel is placed between the MOSFET and the driver chip. The transformer uses an EQ125 core with a turns ratio of 1 / 5 to improve transformer efficiency. The transformer is also equipped with a voltage-stabilizing circuit with multiple capacitors in parallel. This front-stage push-pull circuit 31 is equipped with a full-bridge circuit for AC / DC conversion. The sinusoidal inverter chip in the rear-stage full-bridge inverter circuit 32 ensures stable current output.

[0034] The key parameters of the front-stage push-pull circuit 31 are calculated and optimized, and the transformation ratio and turns ratio are calculated as follows:

[0035] Variation ratio formula:

[0036] N p / N s ＝ V p / V s ×(1-D) ;

[0037] Number of turns selection: According to the core saturation flux density B max And frequency to calculate the minimum turns ratio:

[0038]

[0039] Among them A e is the effective cross-sectional area of ​​the core; ΔB is the change in magnetic flux, which is usually 0.2 to 0.3T.

[0040] Temperature rise control: Calculation of core and winding losses:

[0041]

[0042] The heat dissipation design uses forced air cooling, thermal conductive adhesive filling, or metal casing for heat dissipation. Final testing includes humidity and heat cycle testing and vibration testing. The design meets all requirements.

[0043] As can be seen, the rear-stage full-bridge inverter circuit 32 includes an EG8010 sine wave inverter chip. The front-stage push-pull circuit 31 and the rear-stage full-bridge inverter circuit 32 primarily utilize a two-stage process to achieve efficient conversion. The front-stage push-pull circuit 31 boosts the 40V DC voltage to a 200V peak-to-peak high-frequency AC square wave. The rear-stage full-bridge inverter circuit 32, in conjunction with SPWM modulation, rectifies the high-frequency square wave into high-voltage DC, which is then converted to a 100kHz sine wave through full-bridge inverter.

[0044] Different large vessel closure surgeries may involve vessels of varying thickness and physiological characteristics, requiring different parameters such as the frequency and power of the high-frequency current. This partitioned layout facilitates separate parameter adjustments for the front-stage and back-stage circuits. For example, the output voltage range can be adjusted by changing the transformer turns ratio in the front-stage push-pull circuit 31, or the frequency and duty cycle of the high-frequency output can be adjusted by modifying the control parameters of the sine wave inverter chip in the back-stage full-bridge inverter circuit 32. This allows for flexible adaptation to various surgical scenarios, improving the device's versatility and adaptability to diverse surgical needs.

[0045] The filter inductor and filter capacitor of the rear-stage full-bridge inverter circuit 32 are designed synchronously with the push-pull stage, and the cut-off frequency is designed by the formula:

[0046]

[0047] Obviously, high-frequency large currents such as the switch tube current and the transformer leakage inductance current flowing through the power ground will generate switching noise, high-frequency harmonics, ground bounce noise and other noises; the signal ground is usually used for low-level control circuits, which are sensitive to noise. The power ground and signal ground of the front-stage push-pull circuit 31 and the rear-stage full-bridge inverter circuit 32 are isolated and single-point grounded, which can block the high-frequency noise of the power ground from coupling to the signal ground through the ground line, avoiding the signal ground potential from being contaminated, resulting in malfunction of the control circuit or sampling distortion.

[0048] The partitioned layout gives the circuit better fault isolation characteristics. If the rear-stage full-bridge inverter circuit 32 experiences an abnormality such as inverter chip failure or power tube damage, the relatively clear partitioning and isolation from the front-stage push-pull circuit 31 can prevent the fault from spreading further to the front-stage circuit, protecting the front-stage battery management and other related circuits from being affected. At the same time, it is also convenient to set independent protection mechanisms for circuits in different partitions. For example, the front stage can set overcurrent and overvoltage protection thresholds for the push-pull circuit, and the rear stage can set corresponding high-frequency abnormality protection for the full-bridge inverter circuit, etc., which improves the ability of the entire circuit system to cope with various fault conditions and enhances overall reliability.

[0049] Preferably, the rear-stage full-bridge inverter circuit 32 uses a resistor divider to connect to the voltage feedback pin of the sine wave inverter chip to prevent the output voltage from exceeding the expected design value. At the same time, overload protection uses a mutual inductor and a comparator circuit to detect the output current, triggering a shutdown signal to shut down the system.

[0050] To sum up, the principle of this embodiment is: battery 1 is used for power supply, and current conversion is performed by the battery management circuit 2 and the inverter boost circuit 3, wherein the inverter boost circuit 3 has a front-stage push-pull circuit 31 and a rear-stage full-bridge inverter circuit 32 that are isolated and single-point grounded, blocking the noise coupling path, stabilizing the signal reference potential, and improving the anti-interference ability and system reliability.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0052] Although this document frequently uses terms such as battery 1, battery management circuit 2, boost circuit 21, main control circuit 22, current monitoring circuit 23, temperature detection circuit 24, inverter boost circuit 3, front-stage push-pull circuit 31, and rear-stage full-bridge inverter circuit 32, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations would be contrary to the spirit of the present invention.

Claims

1. A battery-powered high-frequency current large blood vessel closure device control system, comprising a battery (1), characterized in that: The battery (1) is connected to a battery management circuit (2), the battery management circuit (2) is connected to an inverter boost circuit (3), and the inverter boost circuit (3) has a front-stage push-pull circuit (31) and a rear-stage full-bridge inverter circuit (32).

2. A battery-powered high-frequency current large blood vessel closure device control system according to claim 1, characterized in that: The battery management circuit (2) includes a boost circuit (21) connected to the battery, the boost circuit (21) communicates with the main control circuit (22) via the I2C protocol, the output end of the boost circuit (21) is connected to a current monitoring circuit (23), the main control circuit (22) performs AD sampling on the current monitoring circuit (23), and a temperature detection circuit (24) is provided between the main control circuit (22) and the battery.

3. A battery-powered high-frequency current large blood vessel closure device control system according to claim 2, characterized in that: The boost circuit (21) includes a TPS55289 boost converter, and the input and output ends of the boost converter are connected to a filter circuit.

4. The battery-powered high-frequency current large blood vessel closure device control system according to claim 2, characterized in that: The main control circuit (22) includes an STM32H750VBT6 MCU module.

5. The battery-powered high-frequency current large blood vessel closure device control system according to claim 2, characterized in that: The current monitoring circuit (23) includes a current detection amplifier of the INA181A1 model.

6. The battery-powered high-frequency current large blood vessel closure device control system according to claim 2, characterized in that: The temperature detection circuit (24) includes a thermistor of model MCU18XH103D60RB.

7. The battery-powered high-frequency current large blood vessel closure device control system according to claim 1, characterized in that: The front-stage push-pull circuit (31) includes a driver chip of the IXDD604SIA model, and the driver chip is connected to the transformer through a MOS tube of the IRLZ44NSTRLPBF model. The transformer uses an EQ125 magnetic core and has a turns ratio of 1 / 5.

8. The battery-powered high-frequency current large blood vessel closure device control system according to claim 7, characterized in that: The rear-stage full-bridge inverter circuit (32) includes a sine wave inverter chip of the EG8010 model.

9. The battery-powered high-frequency current large blood vessel closure device control system according to claim 8, characterized in that: The power ground and signal ground of the front-stage push-pull circuit (31) and the rear-stage full-bridge inverter circuit (32) are isolated and single-point grounded.

10. The battery-powered high-frequency current large blood vessel closure device control system according to claim 9, characterized in that: The latter full-bridge inverter circuit (32) is connected to the voltage feedback pin of the sine wave inverter chip by using a resistor voltage divider.

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