High-frequency electrotome blood coagulation output control circuit

Abstract

The utility model provides a high-frequency electrotome blood coagulation output control circuit, and relates to the technical field of medical instruments. Comprising a high-frequency driving circuit, a high-frequency booster circuit and a main control circuit, the output end of the main control circuit is connected with the input end of the high-frequency driving circuit, and the output end of the high-frequency driving circuit is connected with the input end of the high-frequency booster circuit; the high-frequency driving circuit comprises a signal generation unit and a power supply and inversion unit, and the main control circuit comprises a micro-control unit used for generating modulation signals. According to the utility model, by realizing the inversion process, the input adjustable direct current is converted into alternating current to be output, and the alternating current has intermittent waveform and higher voltage; on the basis, the problem that in the prior art, alternating current output in an electrotome electrocoagulation mode is mostly generated in an LRC self-excitation oscillation mode, but the waveform of the alternating current carries redundant attenuation waves, and then numerous negative effects are caused is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely is a high frequency electrotome blood coagulation output control circuit. BACKGROUND

[0002] High frequency electrotome is a kind of electric surgical instrument using the heat effect generated when alternating current passes through human body tissue to separate and coagulate tissue;It has the advantages of fast cutting speed, good hemostatic effect, high safety, simple operation and has been widely used in medical field.High frequency electrotome mainly has two basic working modes of cutting and coagulation, wherein: under cutting mode, the waveform of alternating current output by high frequency electrotome is continuous sine wave, and the voltage of this waveform is relatively low but dense and high in energy, so a large amount of heat and high temperature can be released in an instant, and then the rapid cutting of tissue is realized.Under coagulation mode, the waveform of alternating current output by high frequency electrotome is intermittent pulse type, and this discontinuous waveform has the characteristics of low energy but high voltage, compared with the waveform under cutting mode, it generates less heat and lower temperature in an instant, which can coagulate the intima of blood vessels to achieve hemostatic effect.

[0003] In the prior art in the field, the high-frequency high-voltage waveform with attenuation, i.e.the waveform of alternating current output under coagulation mode, is mostly generated by LRC self-excitation oscillation.This high-frequency high-voltage waveform with attenuation can meet the clinical coagulation function, but also has some limitations, for example: first, the excess attenuation wave will generate excess heat, which will cause unintended thermal injury to the patient;Second, the attenuation wave will also cause excess high-frequency leakage current, which may have a negative impact on the patient and the operator;Third, the attenuation wave will also cause excess spatial radiation and conducted interference, which may interfere with the equipment in the operating room;Fourth, the noise existing in this coagulation waveform will affect the collection and feedback accuracy of the collection and feedback circuit of high frequency electrotome, which may cause the high frequency electrotome to fail to guarantee good working effect.

[0004] In view of the above, the utility model provides a high frequency electrotome blood coagulation output control circuit. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a high frequency electrotome blood coagulation output control circuit to solve the problem that the alternating current output under coagulation mode of electrotome is mostly generated by LRC self-excitation oscillation in the prior art, but the waveform of this alternating current has excess attenuation wave, which will cause many negative effects.

[0006] The utility model is implemented by the following technical solutions:

[0007] The application discloses a high-frequency electrotome coagulation output control circuit, which comprises a high-frequency driving circuit, a high-frequency voltage-boosting circuit and a master control circuit, wherein the output end of the master control circuit is connected with the input end of the high-frequency driving circuit, and the output end of the high-frequency driving circuit is connected with the input end of the high-frequency voltage-boosting circuit; the high-frequency driving circuit comprises a signal generating unit and a power supply and inverter unit, and the master control circuit comprises a micro control unit for generating a modulation signal.

[0008] In the control circuit, a 0-500V adjustable DC voltage input from a front-stage circuit is received, the DC voltage provides power support for the whole control circuit, and is converted into high-voltage AC output through an inverting process and a voltage-boosting process; specifically, the high-frequency driving circuit is used for inverting the DC voltage, and the micro control unit in the master control circuit can generate a PWM signal with a specific duty ratio under the control of the modulation signal; the duty ratio of the PWM signal determines the waveform characteristics of the output AC, so that the PWM signal can be used to output the intermittent AC waveform required for electrocoagulation; and then, the intermittent AC is boosted to the working voltage required for electrocoagulation through the voltage-boosting effect of the high-frequency voltage-boosting circuit. In the high-frequency driving circuit, the power supply and inverter unit is used for providing a stable DC power input and realizing the inverting process from DC to AC; and the signal generating unit is used for generating the PWM signal, so as to efficiently realize the conversion from DC to AC and obtain the required intermittent AC waveform.

[0009] Further, the signal generating unit comprises an internal oscillator, two double monostable trigger circuits, a D-type trigger circuit, two AND gates and two MOS tubes; the output end of the internal oscillator is connected with the trigger input end of the two double monostable trigger circuits respectively, the output end of one of the double monostable trigger circuits is connected with the clock input end of the D-type trigger circuit, the signal output end of the micro control unit is connected with the D input end of the D-type trigger circuit, and the output end of the D-type trigger circuit is connected with the input end of the two AND gates respectively, and the output end of the two AND gates is connected with the input end of the two MOS tubes respectively.

[0010] In the above scheme, the internal oscillator can generate a clock pulse signal for the subsequent circuit, and the clock pulse signal is the time reference of the whole control circuit; the two double monostable trigger circuits are used for providing delayed pulse signals for the subsequent circuit respectively, and the delayed pulse signals can be used to further control or adjust the behaviors of other circuit parts; one of the double monostable trigger circuits can control the state updating of the D-type trigger circuit; the D-type trigger circuit generates the PWM signal with the specific duty ratio under the control of the modulation signal, and the logic operation of the two AND gates controls the states of the two MOS tubes, thereby corresponding to the working of the power supply and inverter unit.

[0011] As a further aspect of the present solution, the power and inverter unit comprises two transformers, two MOSFETs, an input connector and an output connector; the input ends of the two transformers in the power and inverter unit are connected with the two MOSFETs in the signal generation unit respectively.

[0012] In the above solution, the two transformers are used for isolation and transformation of voltage level to ensure safety and adapt to load requirements; the input connector is used for receiving 0-500V adjustable DC voltage input by the previous stage circuit; the two MOSFETs are used as power switching devices to realize conversion from DC to AC through fast switching action; and the output connector is used for realizing output of the AC obtained by inversion.

[0013] As a further aspect of the present solution, the high-frequency boost circuit comprises a filter, an intermediate connector, a transformer and an output connector; the intermediate connector in the high-frequency boost circuit is connected with the output connector in the power and inverter unit.

[0014] In the above solution, the filter is used for eliminating high-frequency DC component and improving waveform shape; the intermediate connector is used for receiving the AC generated by the high-frequency driving circuit; the transformer is used for performing ratio boost on the AC to meet the output requirement of coagulation; and the output connector is used for outputting the AC after ratio boost to the load or external equipment.

[0015] As a further aspect of the present solution, the feedback detection circuit is further included, the input end of the feedback detection circuit is connected with the output end of the high-frequency boost circuit, and the output end of the feedback detection circuit is connected with the input end of the main control circuit.

[0016] In the above solution, through the feedback detection circuit, the main control circuit can acquire information of the voltage output by the high-frequency boost circuit in real time, and based on this, can dynamically adjust relevant parameters according to actual output condition, thereby ensuring that the output voltage is always within the set range, so that unintended thermal damage in the coagulation process can be effectively reduced.

[0017] As a further aspect of the present solution, the feedback detection circuit comprises a transformer, three voltage dividing resistors and two voltage stabilizing diodes; the input end of the transformer in the feedback detection circuit is connected with the output connector in the high-frequency boost circuit.

[0018] In the above solution, the transformer is used for reducing the high voltage output by the high-frequency boost circuit to a lower voltage level suitable for subsequent processing; the three voltage dividing resistors form a voltage dividing network, which is used for further transforming the voltage output by the transformer and adjusting to a level suitable for inputting into the micro control unit in the main control circuit; and the voltage stabilizing diodes are used for realizing voltage stabilization to ensure voltage stability of the feedback signal.

[0019] The present utility model realizes the beneficial effects of:

[0020] The high-frequency electrotome coagulation output control circuit is formed by arranging a high-frequency driving circuit, a high-frequency voltage-boosting circuit and a master control circuit, the high-frequency driving circuit comprises a signal generating unit and a power supply and inverter unit, the master control circuit comprises a micro control unit for generating a modulated signal, and the input adjustable direct current can be converted into alternating current output through the inverter process, the alternating current has intermittent waveform and higher voltage, and the requirements of the coagulation output are met.

[0021] Compared with the existing control circuit using the LRC self-excitation oscillation mode and generating noise, the waveform formed by the utility model has no redundant decay wave, and thus redundant heat damage to human body tissue and redundant high-frequency leakage current are avoided, the interference on the equipment in the operating room is reduced, the precision of the coagulation feedback of the high-frequency electrotome is improved, and good working effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structural composition schematic block diagram of the control circuit in the embodiment of the utility model;

[0023] Figure 2 is the high-frequency driving circuit diagram in the control circuit in the embodiment of the utility model;

[0024] Figure 3 is the high-frequency voltage-boosting circuit diagram in the control circuit in the embodiment of the utility model;

[0025] Figure 4 is the feedback detection circuit diagram in the control circuit in the embodiment of the utility model;

[0026] Figure 5 is the coagulation output waveform diagram formed by the control circuit in the embodiment of the utility model;

[0027] Figure 6 is the coagulation output waveform diagram formed by the existing circuit in the embodiment of the utility model. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0029] Embodiment 1

[0030] The embodiment provides a high-frequency electrotome coagulation output control circuit, please refer to Figure 1, including high frequency drive circuit, high frequency boost circuit, main control circuit and feedback detection circuit, the output end of main control circuit connects the input end of high frequency drive circuit, the output end of high frequency drive circuit connects the input end of high frequency boost circuit, the output end of high frequency boost circuit connects the input end of feedback detection circuit, the output end of feedback detection circuit connects the input end of main control circuit;Main control circuit includes micro control unit (MCU) for generating modulation signal (Cut signal). Specifically:

[0031] Please refer to Figure 2 , high frequency drive circuit includes signal generation unit and power and inverter unit, wherein: signal generation unit includes an internal oscillator, monostable trigger Ⅰ IC2, monostable trigger Ⅱ IC4, D flip-flop IC3, AND gate Ⅰ IC5A, AND gate Ⅱ IC5B, MOS tube Ⅰ Q1 and MOS tube Ⅱ Q2;The internal oscillator is composed of counter IC1, resistor Ⅰ R1 and capacitor Ⅰ C1, monostable trigger Ⅰ IC2 is connected with resistor Ⅱ R3 and capacitor Ⅱ C2 respectively, monostable trigger Ⅱ IC4 is connected with resistor Ⅲ R4 and capacitor Ⅲ C3 respectively, resistor Ⅱ R3 and capacitor Ⅱ C2 are used to determine the delay time of monostable trigger Ⅰ IC2, resistor Ⅲ R4 and capacitor Ⅲ C3 are used to determine the delay time of monostable trigger Ⅱ IC4. Two output ends of counter IC1 are connected with trigger input end (pin A) of monostable trigger Ⅰ IC2 and monostable trigger Ⅱ IC4 respectively, the output end of monostable trigger Ⅱ IC4 is connected with the clock input end (CLK end) of D flip-flop, the signal output end of micro control unit is connected with the D input end of D flip-flop, two output ends of D flip-flop are connected with the input end of AND gate Ⅰ IC5A and AND gate Ⅱ IC5B respectively, the output end of AND gate Ⅰ IC5A and AND gate Ⅱ IC5B is connected with the input end of MOS tube Ⅰ Q1 and MOS tube Ⅱ Q2 respectively.

[0032] The power and inverter unit includes transformer Ⅰ T1, transformer Ⅱ T2, MOS tube Ⅲ Q5, MOS tube Ⅳ Q6, input connector Ⅰ J1 and output connector J2;The input end of transformer Ⅰ T1 and transformer Ⅱ T2 is connected with the output end of MOS tube Ⅰ Q1 and MOS tube Ⅱ Q2 respectively, the output end of transformer Ⅰ T1 and transformer Ⅱ T2 is connected with the input end of MOS tube Ⅲ Q5 and MOS tube Ⅳ Q6 respectively.

[0033] Please refer to Figure 3 (in the dashed box), high frequency boost circuit includes filter L3, intermediate connector J3, transformer Ⅲ T5 and final output connector J4;Intermediate connector J3 is connected with output connector J2. Please refer to Figure 4The feedback detection circuit includes transformer IV T6, voltage dividing resistor I R13, voltage dividing resistor II R14, voltage dividing resistor III R15, voltage stabilizing diode I D11 and voltage stabilizing diode II D12.

[0034] Based on the above structural composition, the working process of the embodiment is as follows:

[0035] After converting the 220V mains voltage into 311V DC voltage, the wide voltage DC regulating circuit in the front stage of the control circuit generates a 0-500V adjustable DC voltage, which is received by the input connector I J1; the micro control unit inputs the controlled modulation signal to the D input end of the D-type flip-flop IC3, and when the clock input end of the D-type flip-flop detects a rising edge, the D-type flip-flop will generate a PWM signal with a specific duty cycle according to the modulation signal and output it, which is input into the MOS tube I Q1 and the MOS tube II Q2 after passing through the AND gate I IC5A and the AND gate II IC5B, and controls the state of the MOS tube I Q1 and the MOS tube II Q2, and the MOS tube I Q1 and the MOS tube II Q2 pass the PWM signal to the secondary side through the transformer I T1 and the transformer II T2, and then control the conduction and cutoff of the MOS tube III Q5 and the MOS tube IV Q6, and the MOS tube III Q5 and the MOS tube IV Q6 realize the inversion conversion of DC to AC through fast switching action.

[0036] The high-frequency drive circuit inverts the AC power with a discontinuous waveform, which is output to the intermediate connector J3 in the high-frequency boost circuit through the output connector J2, and after being filtered by the filter L3, reaches the transformer III T5, which performs step-up voltage conversion on the AC power to meet the output requirements of the coagulation, and the step-up AC power is output through the final output connector J4.

[0037] In the feedback detection circuit, the transformer IV T6 reduces the high voltage output by the final output connector J4 to a lower voltage level suitable for subsequent processing, and then the voltage dividing network composed of the voltage dividing resistor I R13, the voltage dividing resistor II R14 and the voltage dividing resistor III R15 further reduces the voltage output by the transformer T6, and after being stabilized by the voltage stabilizing diode I D11 and the voltage stabilizing diode II D12, a stable fbkvpp feedback signal is generated and fed back to the micro control unit, from which the micro control unit obtains real-time information of the voltage output by the high-frequency boost circuit, and then dynamically adjusts the relevant parameters according to the actual output, so as to ensure that the output voltage is always within the set range.

[0038] As described above, the control circuit provided by the embodiment can convert the input adjustable DC power into AC power output through the implementation of the inversion process, and the AC power has a discontinuous waveform and a relatively high voltage, which meets the output requirements of the coagulation. Figure 5 and Figure 6As shown, compared with the prior control circuit, the formed alternating current waveform has no redundant decay wave, thereby having the following advantages: first, no redundant heat is generated, and thus no redundant thermal damage is caused to human tissues; second, no spurious wave exists, and thus no redundant high-frequency leakage current is caused, and thus no negative influence is brought to the patient and the operator; third, the redundant space radiation and conduction interference can be effectively reduced, and thus the interference to the equipment in the operating room is reduced; and fourth, the precision of the high-frequency electrotome collection coagulation feedback can be improved, and thus the high-frequency electrotome can more smoothly control the coagulation and other fine work.

[0039] In addition, since the waveform of the alternating current is controlled by the modulation signal output by the micro control unit, when the control modulation signal is output for a long time at a low level, the D-type flip-flop IC3 can generate a signal with a full duty cycle, and thus the control circuit outputs a continuous sine wave, thereby meeting the output requirement in the high-frequency electrotome electric cutting mode.

[0040] It should be particularly pointed out that the parts not described in detail or expanded in the above scheme are all prior art, and do not belong to the improvement of the prior art by the present application, nor do they belong to the protection scope of the technical scheme of the present application, and thus will not be described herein.

[0041] Of course, the above content is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the embodiments of the present application. The present application is also not limited to the above examples, and any equivalent changes and improvements made by those skilled in the art within the essential scope of the present application should be attributed to the patent coverage range of the present application.

Claims

1. A high frequency electrosurgical coagulation output control circuit, characterized by: The application relates to a high-frequency driving circuit, a high-frequency voltage-boosting circuit and a main control circuit, wherein the output end of the main control circuit is connected with the input end of the high-frequency driving circuit, the output end of the high-frequency driving circuit is connected with the input end of the high-frequency voltage-boosting circuit; the high-frequency driving circuit comprises a signal generating unit and a power supply and inverter unit, and the main control circuit comprises a micro control unit for generating a modulation signal; the signal generating unit comprises an internal oscillator, two double monostable trigger circuits, a D-type trigger, two AND gates and two MOS tubes; the output end of the internal oscillator is connected with the trigger input end of the two double monostable trigger circuits respectively, the output end of one double monostable trigger circuit is connected with the clock input end of the D-type trigger, the signal output end of the micro control unit is connected with the D input end of the D-type trigger, the output end of the D-type trigger is connected with the input end of the two AND gates respectively, and the output end of the two AND gates is connected with the input end of the two MOS tubes respectively. The power supply and inverter unit comprises two transformers, two MOS tubes, an input connector and an output connector; the input end of the two transformers in the power supply and inverter unit is connected with the two MOS tubes in the signal generating unit respectively.

2. The high-frequency electrosurgical coagulation output control circuit of claim 1, wherein: The high-frequency voltage-boosting circuit comprises a filter, an intermediate connector, a transformer and an output connector; the intermediate connector in the high-frequency voltage-boosting circuit is connected with the output connector in the power supply and inverter unit.

3. The high-frequency electrosurgical coagulation output control circuit of claim 2, wherein: The application further comprises a feedback detection circuit, the input end of the feedback detection circuit is connected with the output end of the high-frequency voltage-boosting circuit, and the output end of the feedback detection circuit is connected with the input end of the main control circuit.

4. The high-frequency electrosurgical coagulation output control circuit of claim 3, wherein: The feedback detection circuit comprises a transformer, three voltage dividing resistors and two voltage stabilizing diodes; the input end of the transformer in the feedback detection circuit is connected with the output connector in the high-frequency voltage-boosting circuit.

5. The high-frequency electrosurgical coagulation output control circuit of claim 4, wherein: ​

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