TWI726346B - Electrical discharge circuit and system for surgical instruments - Google Patents

Abstract

An electrical discharge circuit for a surgical instrument includes a gas plasma lightning arrester and a controller. The gas plasma lightning arrester includes a first terminal and a second terminal. The first terminal is electrically connected to the surgical instrument. The gas plasma lightning arrester is configured to receive a test current and generate a plasma discharge. At the instance of the plasma discharge, a lightning arrester voltage and a lightning arrester current are generated. Dynamic impedance of the surgical instrument is related to a result of the lightning arrester voltage divided by the lightning arrester current. The controller is electrically connected to the second terminal for regulating the test current flowing through the gas plasma lightning arrester.

Description

Discharge test circuit and discharge test system of surgical instruments

The present invention relates to a discharge test circuit and a discharge test system for a surgical instrument, in particular to a discharge test circuit for a surgical instrument that uses the discharge of a gas plasma arrester to obtain a dynamic impedance of a surgical instrument, and then judges its pros and cons With discharge test system.

Refer to the first figure. The basic principle of electrocoagulation is to use high-frequency AC voltage and current to generate heat through the surgical instrument (Instrumentset) 100, which makes the water in the human tissue evaporate quickly, and finally achieve tissue separation or blood coagulation. The role of the surgical instrument 100 is an electrosurgical pen 101 and a loop patch 102, or a tissue scissors 103. Generally, an electric cautery operation uses a surgical instrument 100 and an electrosurgical generator 200. The electrosurgical generator 200 generates a high-frequency and high-voltage AC voltage and current, and drives the surgical instrument 100 to generate heat to perform surgery. Electric surgery.

The electric cautery generator 200 has a positive output terminal and a negative output terminal. The electric knife pen 101 is also called a unipolar electric knife, and is used in conjunction with the loop patch 102. The electric knife pen 101 is electrically connected to the electric cautery generator. 200, the circuit patch 102 is electrically connected to the negative output terminal of the electric cautery generator 200, and the circuit patch 102 is pasted on the surgical site of the patient, and the high-frequency current generated by the electric cautery generator 200 passes through After the output of the electrosurgical pen 101 passes through the patient, it flows from the loop patch 102 back to the electrocautery generator 200 to form a current loop to perform an electrocautery operation. However, the tissue cut 103 is also called a bipolar electrosurgical unit. A positive end and a negative end of the tissue scissors 103 are respectively electrically connected to the positive output end and the negative output end of the electric cautery generator 200. Therefore, the electric cautery generator 200 generates high The frequency current passes through a positive terminal and a negative terminal of the tissue scissors 103 to form the current loop.

However, in recent years, medical resources have become increasingly constrained. After the surgical instrument 100 is cleaned by a disinfection procedure, it will be used again for electrocautery surgery. Because the surgical instrument 100 is repeatedly used and is operated under high temperature and high pressure, the surgical instrument 100 The surface metal coating is prone to slight peeling off or overall impedance change. The former will cause the surgical instrument 100 to stick to the human tissue; the latter will cause the voltage and current waveforms of the electric cautery generator 200 to be abnormal. In addition, according to the literature It is stated that the output waveform of the electric cautery generator 200 is preferably a high-frequency sine wave voltage and current, but the waveforms output by the electric cautery generator 200 currently on the market are generally square wave voltage and current.

Therefore, the first objective of the present invention is to provide a discharge test circuit for surgical instruments in order to solve at least one of the above-mentioned problems.

Therefore, the discharge test circuit of the surgical instrument is suitable for a surgical instrument, and the discharge test circuit includes a gas plasma arrester and a control unit.

The gas plasma arrester has a first end of a gas plasma arrester and a second end of a gas plasma arrester. The first end of the gas plasma arrester is electrically connected to the surgical instrument. The gas plasma arrester receives a test current and generates A plasma discharge generates a lightning arrester voltage and a lightning arrester current at the moment of the plasma discharge. A dynamic impedance of the surgical instrument is related to the arrester voltage divided by the arrester current. The control unit is electrically connected to the gas plasma arrester. The two ends are used to control the magnitude of the test current flowing through the gas plasma arrester.

Further, the control unit includes a diode, a field effect transistor, an electronic load controller, and a resistor. The diode has an anode and a cathode electrically connected to the second end of the gas plasma arrester. The field effect The transistor has a first end of a field effect transistor and a second end of the field effect transistor. The first end of the field effect transistor is electrically connected to the cathode of the diode and the electronic load controller, and the second end of the field effect transistor is The terminal is electrically connected to the electronic load controller, and the field-effect transistor is controlled by the electronic load controller to switch the operation mode. The resistor has a first end of the resistor and a second end of the resistor. The first end of the resistor is electrically connected The second end of the field effect transistor.

Further, the control unit further includes a switching element having a first end of the switching element, a second end of the switching element, and a control end of the switching element. The first end of the switching element is electrically connected to the first end of the gas plasma arrester. One end, the second end of the switching element is electrically connected to the second end of the resistor, the control end of the switching element is electrically connected to the electronic load controller, and the switching element can be controlled by the electronic load controller via the control end of the switching element. Switch between a conducting state and an open state.

The second objective of the present invention is to provide a discharge test system for surgical instruments in order to solve at least one of the above-mentioned problems.

The discharge test system of the surgical instrument is suitable for an AC voltage source and a surgical instrument, and the discharge test system includes a high-voltage generating device, a discharge test circuit, and a judgment unit.

The high voltage generating device includes a high voltage generating unit, a transformer, and an output mode conversion control unit. The high voltage generating unit receives an AC input voltage generated by the AC voltage source and generates a first output voltage accordingly. The output voltage is a high-frequency sine wave voltage. The transformer has a primary winding and a secondary winding, each winding has a dotted end and a non-dotted end, and the dotted end and the non-dotted end of the primary winding The high-voltage generating unit is electrically connected to receive the first output voltage, the first output voltage is boosted by the secondary winding, and the output mode conversion control unit is electrically connected The dot end of the secondary winding and the positive end of the surgical instrument to receive the first output voltage and are controlled to control an intermittent interval between every two cycles of the first output voltage so that the first The output voltage is converted into a second output voltage, and the second output voltage is provided to the surgical instrument. The discharge test circuit includes a gas plasma arrester and a control unit. The gas plasma arrester has a first gas plasma arrester. Terminal, and a second terminal of a gas plasma arrester. The first terminal of the gas plasma arrester is electrically connected to the negative terminal of the surgical instrument. The gas plasma arrester receives a test current and generates a plasma discharge. A surge arrester voltage and a surge arrester current are generated at the moment of, a dynamic impedance of the surgical instrument is related to the arrester voltage divided by the arrester current, the control unit is electrically connected to the second end of the gas plasma arrester to control the flow of the gas For the magnitude of the test current of the slurry arrester, the judging unit stores a first threshold value, uses the judging unit to set the dynamic impedance and compares the dynamic impedance with the first threshold value to generate a judgment result.

Further, the control unit includes a diode, a field effect transistor, an electronic load controller, and a resistor. The diode has an anode and a cathode electrically connected to the second end of the gas plasma arrester. The field effect The transistor has a first end of a field effect transistor and a second end of the field effect transistor. The first end of the field effect transistor is electrically connected to the cathode of the diode and the electronic load controller, and the second end of the field effect transistor is The terminal is electrically connected to the electronic load controller, and the field-effect transistor is controlled by the electronic load controller to switch the operation mode. The resistor has a first end of the resistor and a second end of the resistor. The first end of the resistor is electrically connected The second end of the field effect transistor and the second end of the resistor are electrically connected to the non-spot end of the secondary winding of the transformer.

Further, the control unit further includes a switching element having a first end of the switching element, a second end of the switching element, and a control end of the switching element. The first end of the switching element is electrically connected to the first end of the gas plasma arrester. One end, the second end of the switching element is electrically connected to the second end of the resistor, and the switch The switching element control terminal is electrically connected to the electronic load controller, and the switching element can be switched between an on state and an open state under the control of the electronic load controller via the switching element control terminal.

Further, the high-voltage generating unit includes a power factor corrector, a synchronous rectification step-down converter, and a single-phase sine wave pulse width modulation high-frequency inverter, and the power factor corrector is electrically connected to the AC voltage source and The synchronous rectification and step-down converter, the single-phase sine wave pulse width modulation high-frequency inverter is electrically connected to the synchronous rectification and step-down converter and the dot and non-dot ends of the primary winding of the transformer, and the single-phase The sine wave pulse width modulation high frequency inverter can output the first output voltage and can adjust an operating frequency of the waveform of the first output voltage.

Further, the synchronous rectification step-down converter includes an upper bridge switch, a lower bridge switch, a first inductor, and a first output capacitor. The upper bridge switch has a first terminal of the upper bridge switch, and a first end of the upper bridge switch. Two ends, the first end of the upper bridge switch is electrically connected to the power factor modifier, and the upper bridge switch is controlled to switch between a conducting state and a non-conducting state, the lower bridge switch has a first end of the lower bridge switch, and The second end of the lower bridge switch, the first end of the lower bridge switch is electrically connected to the second end of the upper bridge switch, the second end of the lower bridge switch is electrically connected to the power factor corrector, and the lower bridge switch is controlled to be switched on Between the state and the non-conduction state, the controlled conduction state of the high-bridge switch and the low-bridge switch is opposite, the first inductor has a first inductor first end, and a first inductor second end, the first inductor The first end is electrically connected to the first end of the lower bridge switch, the first output capacitor has a first end of a first output capacitor, and a second end of a first output capacitor, and the first end of the first output capacitor is electrically connected to the first end of the first output capacitor. A second end of the inductor.

Further, the single-phase sine wave pulse width modulation high frequency inverter includes an input capacitor, a first switch, a second switch, a third switch, a fourth switch, a second inductor, and a first switch. Two output capacitors. The input capacitor has a first end of an input capacitor and a second end of an input capacitor. Both the first end of the input capacitor and the second end of the input capacitor are electrically connected to the synchronous rectification and buck converter. The switch has a first end of a first switch, and a second end of a first switch. The first end of the first switch is electrically connected to the first end of the input capacitor, and the first switch is controlled to switch between a conducting state and a non-conducting state Between states, the second switch has a first end of a second switch and a second end of a second switch. The second end of the second switch is electrically connected to the second end of the input capacitor, and the second switch is controlled to Switching between a conducting state and a non-conducting state, the third switch has a first end of a third switch and a second end of a third switch. The first end of the third switch is electrically connected to the second end of the first switch, The second end of the third switch is electrically connected to the second end of the input capacitor, and the third switch is controlled to switch between the conducting state and the non-conducting state, the fourth switch has a fourth switch first end, and a The second end of the fourth switch, the first end of the fourth switch is electrically connected to the first end of the input capacitor, the second end of the fourth switch is electrically connected to the first end of the second switch, and the fourth switch is controlled to switch to Between the conducting state and the non-conducting state, the second inductor has a first end of a second inductor and a second end of a second inductor. The first end of the second inductor is electrically connected to the second end of the first switch. The two output capacitors have a first end of a second output capacitor and a second end of a second output capacitor. The first end of the second output capacitor is electrically connected to the second end of the second inductor and the dot end of the primary winding of the transformer The second end of the second output capacitor is electrically connected to the first end of the second switch and the non-stubbing end of the primary winding of the transformer.

According to the above technical features, the following effects can be achieved:

1. The surge arrester voltage and the surge arrester current are generated at the moment the plasma discharge occurs by the gas plasma arrester of the discharge test circuit to obtain the dynamic impedance of the surgical instrument, and the judgment unit is used to determine the dynamic impedance Judging the quality of the surgical instrument allows medical personnel to decide whether to use the surgical instrument based on the results, and avoids the disadvantages of using the surgical instrument that is unusable during the operation.

2. Since the switch element can be switched between the on state and the open state by the electronic load controller, after the test of the surgical instrument is completed, the switch element is controlled in the on state, and the surgical instrument is operated The impedance value of itself can be used directly without being affected by the discharge test circuit, which is quite convenient.

3. The high-voltage generating device can adjust the output sine wave waveform arbitrarily through the synchronous rectification step-down converter and the single-phase sine wave pulse width modulation high frequency inverter to meet the use of electrocautery.

1: High-voltage generating device

11: High voltage generating unit

111: Power Factor Corrector

112: Synchronous rectification step-down converter

113: Single-phase sine wave pulse width modulation high frequency inverter

114: Controller

115: drive

1151: first comparator

1152: second comparator

1153: third comparator

1154: fourth comparator

12: Transformer

13: Output mode conversion control unit

131: Conversion Controller

2: Discharge test circuit

21: Gas plasma arrester

21 _a : First end of gas plasma arrester

21 _b : The second end of the gas plasma arrester

22: control unit

221: Electronic Load Controller

222: switching element

222 _a : the first end of the switching element

222 _b : the second end of the switching element

222 _c : switching element control terminal

3: Judgment unit

100: Surgical instruments

101: Electric knife pen

102: loop patch

103: tissue shear

200: electric cautery generator

V _AC : AC input voltage

V _o1 : the first output voltage

V _o2 : second output voltage

V _sin : sine wave

V _tri : triangle wave

V _gs1 : the first pulse width modulation signal

V _gs2 : second pulse width modulation signal

V _gs3 : third pulse width modulation signal

V _gs4 : fourth pulse width modulation signal

Q _H : upper bridge switch

Q _Ha : The first terminal of the upper bridge switch

Q _Hb : The second end of the upper bridge switch

Q _L : Lower bridge switch

Q _La : the first end of the lower bridge switch

Q _Lb : The second end of the lower bridge switch

Q ₁ : The first switch

Q _1a : the first end of the first switch

Q _1b : the second end of the first switch

Q ₂ : The second switch

Q _2a : the first end of the second switch

Q _2b : the second end of the second switch

Q ₃ : The third switch

Q _3a : The first end of the third switch

Q _3b : the second end of the third switch

Q ₄ : The fourth switch

Q _4a : The first end of the fourth switch

Q _4b : the second end of the fourth switch

Q ₅ : Fifth switch

Q _5a : The first end of the fifth switch

Q _5b : the second end of the fifth switch

Q ₆ : The sixth switch

Q _6a : The first end of the sixth switch

Q _6b : The second end of the sixth switch

Q: Field effect transistor

Q _a : first terminal of field effect transistor

Q _b : second terminal of field effect transistor

L ₁ : first inductance

L _1a : the first end of the first inductor

L _1b : the second end of the first inductor

L ₂ : second inductance

L _2a : the first end of the second inductor

L _2b : the second end of the second inductor

C _in : Input capacitance

C _ina : the first end of the input capacitor

C _inb : the second end of the input capacitor

C _o1 : first output capacitor

C _o1a : the first end of the first output capacitor

C _o1b : the second end of the first output capacitor

C _o2 : second output capacitor

C _o2a : the first end of the second output capacitor

C _o2b : the second end of the second output capacitor

D: Diode

R: resistance

R _a : the first end of the resistor

R _b : the second end of the resistor

d ₁ : Duty cycle

d ₂ : Duty cycle

i _t : test current

S _Relay : switch control signal

S _current : feedback current signal

S1: Installation steps

S2: Setting steps

S3: Plasma discharge step

S4: Judgment step

S5: startup steps

[The first figure] is a three-dimensional schematic diagram illustrating a surgical instrument and an electric cautery generator currently in use.

[The second figure] is a block diagram illustrating an embodiment of the discharge test system of the surgical instrument of the present invention.

[Third Figure] is a circuit diagram illustrating the circuit of a synchronous rectification buck converter of this embodiment.

[Fourth Figure] is a circuit diagram illustrating the circuit of a single-phase sine wave pulse width modulation high-frequency inverter, a transformer, and an output mode conversion control unit of this embodiment.

[Fifth Figure] is a waveform diagram illustrating that a high voltage generating device of this embodiment operates in a cutting mode.

[Figure 6] is a waveform diagram illustrating the operation of the high-voltage generating device of this embodiment in a solidification mode.

[Seventh Figure] is a waveform diagram illustrating the operation of the high-voltage generating device of this embodiment in a mixed mode.

[Figure 8] is a step diagram illustrating the implementation of a discharge test method in this embodiment.

[Figure 9A] is a three-dimensional schematic diagram illustrating that this embodiment is connected with a tissue scissors.

[Figure 9B] is a three-dimensional schematic diagram illustrating that this embodiment is connected with an electrosurgical pen and a circuit patch.

Based on the above technical features, the main effects of the discharge test system of the surgical instrument of the present invention will be clearly presented in the following embodiments.

Referring to Figures 2 to 4, an embodiment of a discharge test system for a surgical instrument of the present invention is applicable to an AC voltage source and a surgical instrument 100. When a discharge test method is performed, the surgical instrument 100 can be used before The pros and cons are first judged to determine whether the surgical instrument 100 should be used again. The AC voltage source is used to generate an AC input voltage V _AC . The surgical instrument 100 is an electrosurgical pen 101 and a loop patch 102, or a tissue scissors 103. The electrosurgical pen 101 includes a positive terminal, the loop patch 102 includes a negative terminal, and the electrosurgical pen 101 and the loop patch 102 are used in conjunction with each other. The tissue scissors 103 includes a positive terminal and a negative terminal. The discharge test system includes a high-voltage generating device 1, a discharge test circuit 2, and a judgment unit 3.

The high voltage generating device 1 includes a high voltage generating unit 11, a transformer 12, and an output mode conversion control unit 13.

The high voltage generating unit 11 is electrically connected to the AC voltage source to receive the AC input voltage V _AC , and accordingly generate a first output voltage V _o1 , the first output voltage V _o1 is a high frequency sine wave voltage, and the high voltage generates The unit 11 includes a power factor corrector 111, a synchronous rectification buck converter 112, and a single phase sinusoidal pulse width modulation high frequency inverter (Single phase sinusoidal pulse). width modulated RF inverter (SPWM RF inverter) 113, a controller 114, and a driver (SPWM Gate driver) 115.

The power factor corrector 111 is electrically connected to the AC voltage source, and converts the AC input voltage V _AC into a DC voltage.

The synchronous rectification buck converter 112 includes an upper bridge switch Q _H , a lower bridge switch Q _L , a first inductor L ₁ , and a first output capacitor C _o1 . The upper bridge switch Q _H has a first end Q _{Ha of the} upper bridge switch and a second end Q _Hb of the upper bridge switch. The first end Q _{Ha of} the upper bridge switch is electrically connected to the power factor corrector 111, and the upper bridge The switch Q _H is controlled to switch between a conducting state and a non-conducting state. The high-bridge switch Q _H is an N-type MOSFET, the first terminal Q _Ha of the high-bridge switch is a drain, and the second terminal Q _Hb of the high-bridge switch is a source. The lower bridge switch Q _L has a first end Q _La of the lower bridge switch and a second end Q _Lb of the lower bridge switch. The first end Q _{La of} the lower bridge switch is electrically connected to the second end Q _{Hb of} the upper bridge switch. The second terminal Q _{Lb of the} switch is electrically connected to the power factor corrector 111, and the low-bridge switch Q _L is controlled to switch between a conducting state and a non-conducting state. The low-bridge switch Q _L is an N-type MOSFET, the first terminal Q _La of the low-bridge switch is a drain, and the second terminal Q _Lb of the low-bridge switch is a source. The controlled conduction states of the upper bridge switch Q _H and the lower bridge switch Q _L are opposite. Further, the control signals that control the upper bridge switch Q _H and the lower bridge switch Q _L must be complementary signals and have a dead time (Dead -Time) to prevent the short circuit of the output voltage received from the power _{factor corrector 111 caused by the simultaneous conduction of the upper bridge switch Q H} and the lower bridge switch Q _L. The first inductor L ₁ has a first inductor first terminal L _1a and a first inductor second terminal L _1b . The first inductor first terminal L _{1a is} electrically connected to the first terminal Q _{La of} the lower bridge switch. a first output capacitor C _o1 having a first output terminal of the first capacitor _C o1a, and a first output terminal of the second capacitor _C o1b, the first output terminal of the first capacitor _C o1a electrically connected to the second end of the first inductor L _1b . Therefore, when the high-bridge switch Q _{H is} turned on, the first inductor L ₁ stores energy; when the high-bridge switch Q _{H is} turned off, the low-bridge switch Q _L is turned on, and the first inductor L ₁ starts to perform. Release energy.

The single-phase sine wave pulse width modulation high frequency inverter 113 includes an input capacitor C _in , a first switch Q ₁ , a second switch Q ₂ , a third switch Q ₃ , and a fourth switch Q ₄ , A second inductor L ₂ , and a second output capacitor C _o2 .

The input capacitor C _in has a first input capacitor C _ina and a second input capacitor C _inb . The first input capacitor C _ina and the second input capacitor C _{inb are both} electrically connected to the synchronous rectification and step-down Converter 112. The first switch Q ₁ has a first switch first terminal Q _1a and a first switch second terminal Q _1b . The first switch first terminal Q _{1a is} electrically connected to the input capacitor first terminal C _ina , and the The first switch Q ₁ is controlled to switch between a conducting state and a non-conducting state. The first switch Q ₁ is an N-type MOSFET, the first terminal Q _1a of the first switch is a drain, and the second terminal Q _1b of the first switch is a source. The second switch Q ₂ has a second switch first terminal Q _2a and a second switch second terminal Q _2b , the second switch second terminal Q _{2b is} electrically connected to the input capacitor second terminal C _inb , and the The second switch Q ₂ is controlled to switch between a conducting state and a non-conducting state. The second switch Q ₂ is an N-type MOSFET, the first terminal Q _2a of the second switch is a drain, and the second terminal Q _2b of the second switch is a source. The third switch Q ₃ has a third switch first terminal Q _3a and a third switch second terminal Q _3b . The third switch first terminal Q _{3a is} electrically connected to the first switch second terminal Q _1b . The second terminal Q _{3b of the} third switch is electrically connected to the second terminal C _{inb of} the input capacitor, and the third switch Q ₃ is controlled to switch between a conducting state and a non-conducting state. The third switch Q ₃ is an N-type MOSFET, the first terminal Q _3a of the third switch is a drain, and the second terminal Q _3b of the third switch is a source. The fourth switch Q ₄ has a fourth switch first terminal Q _4a and a fourth switch second terminal Q _4b . The fourth switch first terminal Q _{4a is} electrically connected to the input capacitor first terminal C _ina . The second terminal Q _{4b of the} four switch is electrically connected to the first terminal Q _{2a of} the second switch, and the fourth switch Q ₄ is controlled to switch between a conducting state and a non-conducting state. The fourth switch Q ₄ is an N-type MOSFET, the first terminal Q _4a of the fourth switch is a drain, and the second terminal Q _4b of the fourth switch is a source. The second inductor L ₂ has a second inductor first terminal L _2a and a second inductor second terminal L _2b . The second inductor first terminal L _{2a is} electrically connected to the first switch second terminal Q _1b . The second output capacitor C _o2 having a second output terminal of the first capacitor _C o2a, and a second output terminal of the second capacitor _C o2b, the second output terminal of the first capacitor _C o2a electrically connects the second terminal of the second inductor L _{2b , the second terminal Co2b of} the second output capacitor is electrically connected to the first terminal Q _{2a of} the second switch.

The driver 115 includes a first comparator 1151, a second comparator 1152, a third comparator 1153, and a fourth comparator 1154. The first comparator 1151 has a non-inverting input terminal, an inverting input terminal, and an output terminal for _{controlling the conduction state of the first switch Q 1.} The second comparator 1152 has a non-inverting input terminal, an inverting input terminal, and an output terminal for _{controlling the conduction state of the second switch Q 2.} The third comparator 1153 has a non-inverting input terminal, an inverting input terminal, and an output terminal for _{controlling the conduction state of the third switch Q 3.} The fourth comparator 1154 having a positive input, an inverting input terminal, an output and a control terminal of the fourth switch Q ₄ of the conducting state.

The function of the single-phase sine wave pulse width modulation high frequency inverter 113 is to convert a DC voltage into an AC voltage, the controller 114, the driver 115, and the single phase sine wave pulse width modulation high frequency inverter The operating principle of the converter 113 is that _{the control signals for controlling the first switch Q 1} and the third switch Q ₃ are complementary signals. For example, the controller 114 outputs a sine wave V _sin and a triangle wave V tri, so that the _{sine wave V sin and a triangle wave V tri are outputted.} The wave V _{sin is} input to the non-inverting input terminal of the first comparator 1151, and the triangular wave V _{tri is} input to the inverting input terminal of the first comparator 1151. After the first comparator 1151 compares the input signals with each other, the first comparator 1151 The output terminal of a comparator 1151 outputs a first pulse width modulation signal V _gs1 to control the first switch Q ₁ , otherwise, the controller 114 _{inputs the triangular wave V tri} to the positive of the third comparator 1153 The input terminal of the sine wave V _{sin is} input to the inverting input terminal of the third comparator 1153. After the third comparator 1153 compares the input signals with each other, the output terminal of the third comparator 1153 will output a first The three-pulse width modulation signal V _gs3 controls the third switch Q ₃ . Similarly, the control principles of the second switch Q ₂ and the fourth switch Q ₄ are the same. Then, the voltage signal between the _{second terminal of the first switch Q 1 and} the first terminal of the second switch Q ₂ Is a high-frequency AC square wave voltage, after being low-pass filtered _{by the second inductor L 2} and the second output capacitor C _{o2 , the first output voltage Vo1} output is a high-frequency sine wave voltage, and An operating frequency of the first output voltage _Vo1 can be arbitrarily adjusted. When performing an electrocautery operation, the _{operating frequency of the first output voltage Vo1} is adjusted to 300 kHz to 500 kHz.

It should be supplemented that if the duty cycle d1 of the output voltage of the synchronous rectification buck converter 112 is fixed, the single-phase sine wave pulse width modulation high frequency inverter 113 is operated under voltage mode control, and the output If the synchronous rectification and step-down converter 112 is operated under current mode control, the single-phase sine wave pulse width modulation high frequency inverter 113 outputs the first output voltage _{Vo1 to reach the constant voltage function.} When the duty cycle d2 of the output voltage _Vo1 is fixed, the output of the single-phase sine wave pulse width modulation high frequency inverter 113 can achieve a constant current function.

The transformer 12 has a primary winding and a secondary winding. Each side of the winding has a dotted end and a non-dotted end. The dotted end of the primary winding of the transformer 12 is electrically connected to the first end _{Co2a of} the second output capacitor, and the non-dotted end of the primary winding of the transformer 12 is electrically connected to the second end _{Co2b of} the second output capacitor. The transformer 12 _{The first output voltage Vo1 of} the single-phase sine wave pulse width modulation high frequency inverter 113 is received, and the first output voltage _{Vo1 is} boosted by the secondary winding.

The output mode switching control unit 13 includes a fifth switch Q ₅ , a sixth switch Q ₆ , and a switching controller 131. The fifth switch Q ₅ has a fifth switch first terminal Q _5a and a fifth switch second terminal Q _5b . The fifth switch first terminal Q _{5a is} electrically connected to the dot terminal of the secondary winding of the transformer 12 , And the fifth switch Q ₅ is controlled by the switching controller 131 to switch between a conducting state and a non-conducting state. The fifth switch Q ₅ is an N-type MOSFET, the first terminal Q _5a of the fifth switch is a drain, and the second terminal Q _5b of the fifth switch is a source. The sixth switch Q ₆ has a sixth switch first terminal Q _6a and a sixth switch second terminal Q _6b . The sixth switch first terminal Q _{6a is} electrically connected to the fifth switch second terminal Q _5b . The second terminal Q _{6b of the} sixth switch is electrically connected to the positive terminal of the surgical instrument 100, and the sixth switch Q ₆ is controlled by the switching controller 131 to switch between a conducting state and a non-conducting state. The sixth switch Q ₆ is an N-type MOSFET, the first terminal Q _6a of the sixth switch is a source, and the second terminal Q _6b of the sixth switch is a drain. The conversion controller 131 may detect the first zero of the output voltage V _o1 of the crossover point, and give an output mode control signal according to the zero-crossing point of the first output voltage V _o1 and a setting instruction, the fifth switch Q ₅ , the sixth switch Q ₆ receives the first output voltage V _o1 , and controls an intermittent interval between every two cycles of the first output voltage V o1 according to the output mode control signal, so that the first output voltage V _o1 The output voltage _{Vo1 is} converted into a second output voltage _Vo2 , and the second output voltage _{Vo2 is} provided to the surgical instrument 100.

The high voltage generating device 1 can be controlled to output the second output voltage _Vo2 , so that the operation mode of the second output voltage _Vo2 can be divided into three modes:

(1) Cutting mode: The second output voltage _Vo2 is a continuous voltage waveform. As shown in the fifth figure, the period is set to 100%, and the intermittent interval is zero. When the cutting mode is not in contact with human tissues, The tip of the surgical instrument 100 is used to cut human tissue.

(2) Coagulation mode: the second output voltage _Vo2 is a discontinuous voltage waveform, as shown in the sixth figure, the period is set to 6% of the 100% period, and the coagulation mode uses the large-area electrode of the surgical instrument 100 Seal the blood vessels of the human body to achieve the purpose of hemostasis.

(3) Mixed mode: the second output voltage _Vo2 is a discontinuous voltage waveform, as shown in the seventh figure, the period is set to 50% of the 100% period, and the mixed mode is to use the surgical instrument 100 for cutting and coagulation The function.

Referring to the second figure again, the discharge test circuit 2 includes a gas plasma arrester 21 and a control unit 22.

The gas plasma arrester 21 has a first end 21 _{a of the} gas plasma arrester and a second end 21 _b of the gas plasma arrester. The first end 21 _{a of} the gas plasma arrester is electrically connected to the negative terminal of the surgical instrument 100.

The control unit 22 includes a diode D, a field effect transistor Q, an electronic load controller 221, a resistor R, and a switching element 222. The diode D has an anode and a cathode electrically connected to the second end 21 _{b of the gas plasma arrester.} The field effect transistor Q has a first end Q _a of a field effect transistor and a second end Q _b of the field effect transistor. The first end Q _{a of} the field effect transistor is electrically connected to the cathode of the diode D and the electron The load controller 221, the second terminal Q _{b of} the field effect transistor is electrically connected to the electronic load controller 221, and the field effect transistor Q is controlled by the electronic load controller 221 to switch the operation mode. In this example, the field effect transistor Q is an N-type MOSFET, the first terminal Q _a of the field effect transistor is a drain, and the second terminal Q _b of the field effect transistor is a source. pole. The resistor R having a first end of a resistor R _a, and a second terminal of resistor R _b, R _a terminal of the first resistor is electrically connected to the second end of the crystal field effect Q _b, R _B the resistance of the second terminal is electrically connected The non-stubbed end of the secondary winding of the transformer 12 is a second end. The switching element 222 has a first end of the switching element 222 _a, a second terminal of the switching element 222 _b, and a switching element control terminal 222 _c, a first end 222 of the switching element _A is electrically connected to a first end of the plasma gas arrester 21 _a , the second end 222 _{b of} the switching element is electrically connected to the second end R _{b of} the resistor, the control end 222 _{c of} the switching element is electrically connected to the electronic load controller 221, and the switching element 222 can be controlled via the control end 222 _{c of the switching element} The electronic load controller 221 is controlled by the electronic load controller 221 to switch between an on state and an open state. The switch element 222 is a relay, and the switch element 222 is normally in an open state. When the electronic load controller 221 generates a switch control signal S _Relay , the relay receives the switch control signal S _Relay and receives the switch control signal S _Relay. The control changes to the on state.

The determining unit 3 stores a first critical value, the first critical value is an impedance value, and the impedance value is related to a critical value of whether the surgical instrument 100 can continue to use the boundary, and the determining unit 3 is similar An electronic device with logical comparison, judgment, and calculation functions. It should be noted that the judging unit 3 can also store multiple thresholds, which are related to different models of multiple surgical instruments 100 or classified into different grades such as excellent, acceptable, and unacceptable. Multiple impedance values. In this example, the judgment unit 3 stores a first critical value for illustration.

Referring to the second figure, the fourth figure, and the eighth figure, the discharge test system executes the discharge test method. The discharge test method includes an installation step S1, a setting step S2, a plasma discharge step S3, and a judgment step S4, and a start step S5.

Installation step S1: connect the surgical instrument 100 to be measured between the high-voltage generating device 1 and the discharge test circuit 2, for example, connect the positive end of the tissue scissors 103 to the second terminal of the high-voltage generating device 1. The positive terminal of the output voltage _Vo2 , the negative terminal of the tissue scissors 103 is connected to the first terminal 21a of the gas plasma arrester 21 of the discharge test circuit 2, and the appearance is as shown in Fig. _{9A. Or connect the electrosurgical pen 101 to the positive pole of the second output voltage V o2} of the high-voltage generator 1, and connect the loop patch 102 to the first gas plasma arrester of the gas plasma arrester 21 of the discharge test circuit 2 end 21 _a, the appearance as shown in Figure IX B. Next, this setting step S2 is performed.

Setting step S2: the control unit 2 by using the test circuit 22 controls the discharge of the gas flowing through a plasma arrester magnitude of the test current i _t 21. Wherein, the electronic load controller 221 receives a feedback current signal S _current generated by the field effect transistor Q, and controls the field effect transistor Q to operate in a linear region according to the feedback current signal S _{current, so that the} FET Q be a variable resistor a voltage control type, whereby to control the magnitude of the flowing current i _t test the plasma gas arrester 21 in order to achieve current limit function, in order to avoid the gas plasma The arrester 21 generates an excessive current later (at the time of plasma discharge). Next, the plasma discharge step S3 is performed.

Plasma Discharge Step S3: With this plasma gas arrester 21 receives the test current i _t and generating a plasma discharge, generating a lightning arrester and a voltage at the instant of the plasma discharge current, wherein the surgical instrument 100 a The dynamic impedance is related to the arrester voltage divided by the arrester current. Next, this judgment step S4 is performed.

Judgment step S4: Use the judgment unit 3 to set the dynamic impedance, and compare the dynamic impedance with the first critical value to generate a judgment result. For example, if the dynamic impedance is greater than the first critical value, it means the operation If the condition of the instrument 100 is no longer suitable for reuse, the medical staff can discard the surgical instrument 100. If the dynamic impedance is less than the first critical value, it means that the condition of the surgical instrument 100 can be reused, and then proceed to the starting step S5 Therefore, the medical personnel can know whether the surgical instrument 100 can continue to be used according to the judgment result.

Start step S5: use the electronic load controller 221 to control the field-effect transistor Q to operate in a cut-off area, and then use the electronic load controller 221 of the control unit 22 to generate the switch control signal S _Relay , and the switch element 222 receives If the switch control signal S _Relay is controlled by the switch control signal S _Relay to be turned into a conducting state, the current flowing through the surgical instrument 100 will directly flow through the switching element 222 and then flow back to the high-voltage generating device 1, so that the surgical instrument 100 operates at its own impedance value and is not affected by the discharge test circuit 2, and then the operation mode of the high-voltage generating device 1 can be set to perform an electrocautery operation.

In summary, the surge arrester voltage and the surge arrester current are generated at the moment the plasma discharge occurs by the gas plasma arrester 21 of the discharge test circuit 2 to obtain the dynamic impedance of the surgical instrument 100, and by the The judging unit 3 judges the quality of the surgical instrument 100 according to the dynamic impedance, so that medical personnel can decide whether to use the surgical instrument 100 according to the result, and can avoid the disadvantages caused by the use of the surgical instrument 100 during the operation process. , And then the switch element 222 can receive the electron The load controller 221 switches between the on state and the open state. After the test of the surgical instrument 100 is completed, the switch element 222 is controlled in the on state, and the surgical instrument 100 can be operated directly at its own impedance value. Continuing to use is not affected by the discharge test circuit 2, and it is quite convenient. More preferably, the high-voltage generating device 1 uses the synchronous rectification buck converter 112 and the single-phase sine wave pulse width modulation high-frequency reverse The converter 113 can arbitrarily adjust the output sine wave waveform to meet the use of electrocautery surgery.

Based on the description of the above embodiments, when one can fully understand the operation and use of the present invention and the effects of the present invention, but the above embodiments are only the preferred embodiments of the present invention, and the implementation of the present invention cannot be limited by this. The scope, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention, are all within the scope of the present invention.

1: High-voltage generating device

11: High voltage generating unit

111: Power Factor Corrector

112: Synchronous rectification step-down converter

113: Single-phase sine wave pulse width modulation high frequency inverter

114: Controller

115: drive

12: Transformer

13: Output mode conversion control unit

2: Discharge test circuit

21: Gas plasma arrester

21 _a : First end of gas plasma arrester

21 _b : The second end of the gas plasma arrester

22: control unit

221: Electronic Load Controller

222: switching element

222 _a : the first end of the switching element

222 _b : the second end of the switching element

222 _c : switching element control terminal

3: Judgment unit

V _AC : AC input voltage

V _o1 : the first output voltage

V _o2 : second output voltage

V _sin : sine wave

V _tri : triangle wave

V _gs1 : the first pulse width modulation signal

V _gs2 : second pulse width modulation signal

V _gs3 : third pulse width modulation signal

V _gs4 : fourth pulse width modulation signal

Q: Field effect transistor

Q _a : first terminal of field effect transistor

Q _b : second terminal of field effect transistor

D: Diode

R: resistance

R _a : the first end of the resistor

R _b : the second end of the resistor

d ₁ : Duty cycle

d ₂ : Duty cycle

i _t : test current

S _Relay : switch control signal

S _current : feedback current signal

Claims (9)

A discharge test circuit of a surgical instrument is suitable for a surgical instrument, and the discharge test circuit includes: a gas plasma arrester having a first end of a gas plasma arrester and a second end of the gas plasma arrester. The first end of the plasma arrester is electrically connected to the surgical instrument. The gas plasma arrester receives a test current and generates a plasma discharge. At the moment of the plasma discharge, a lightning arrester voltage and a lightning arrester current are generated, and a dynamic impedance of the surgical instrument It is related to the voltage of the arrester divided by the current of the arrester; and a control unit electrically connected to the second end of the gas plasma arrester to control the magnitude of the test current flowing through the gas plasma arrester. The discharge test circuit for a surgical instrument according to claim 1, wherein the control unit includes a diode, a field-effect transistor, an electronic load controller, and a resistor, and the diode is electrically connected to the gas An anode and a cathode at the second end of the plasma arrester. The field effect transistor has a first end of a field effect transistor and a second end of a field effect transistor. The first end of the field effect transistor is electrically connected to the cathode of the diode And the electronic load controller, the second end of the field-effect transistor is electrically connected to the electronic load controller, and the field-effect transistor is controlled by the electronic load controller to switch operation modes, the resistor has a first end of the resistor, And a second end of a resistor, the first end of the resistor is electrically connected to the second end of the field effect transistor. The discharge test circuit for a surgical instrument according to claim 2, wherein the control unit further includes a switch element, the switch element having a first end of the switch element, a second end of the switch element, and a control end of the switch element, The first end of the switch element is electrically connected to the first end of the gas plasma arrester, the second end of the switch element is electrically connected to the second end of the resistor, the control end of the switch element is electrically connected to the electronic load controller, and the switch element can pass through the The control terminal of the switching element is controlled by the electronic load controller to switch between an on state and an open state. A discharge test system for surgical instruments is suitable for an AC voltage source and a surgical instrument, and the discharge test system includes: a high voltage generating device, including a high voltage generating unit, a transformer, and an output mode conversion control unit. The generating unit receives an AC input voltage generated by the AC voltage source and generates a first output voltage accordingly. The first output voltage is a high frequency sine wave voltage. The transformer has a primary winding and a secondary winding. Winding, each side winding has a dotted end and a non-dotted end, the dotted end and the non-dotted end of the primary winding are electrically connected to the high-voltage generating unit to receive the first output voltage, and the second winding is used on the secondary winding. An output voltage is boosted, and the output mode conversion control unit is electrically connected to the dot end of the secondary winding and the positive end of the surgical instrument to receive the first output voltage, and is controlled to control each of the first output voltage In an intermittent interval between two cycles, the first output voltage is converted into a second output voltage, and the second output voltage is provided to the surgical instrument; a discharge test circuit, including a gas plasma arrester and a control Unit, the gas plasma arrester has a first end of the gas plasma arrester, and a second end of the gas plasma arrester, the first end of the gas plasma arrester is electrically connected to the negative terminal of the surgical instrument, and the gas plasma arrester receives A test current and a plasma discharge are generated. At the moment of the plasma discharge, an arrester voltage and an arrester current are generated. A dynamic impedance of the surgical instrument is related to the arrester voltage divided by the arrester current. The control unit is electrically connected to the The second end of the gas plasma arrester is used to control the magnitude of the test current flowing through the gas plasma arrester; and a judging unit, which stores a first critical value, uses the judging unit to set the dynamic impedance and compare the dynamic impedance with The first critical value is compared to generate a judgment result. The discharge test system for a surgical instrument according to claim 4, wherein the control unit includes a diode, a field-effect transistor, an electronic load controller, and a resistor, and the diode has an electric An anode and a cathode connected to the second end of the gas plasma arrester. The field effect transistor has a first end of a field effect transistor and a second end of a field effect transistor. The first end of the field effect transistor is electrically connected to the two The cathode of the polar body and the electronic load controller, the second end of the field effect transistor is electrically connected to the electronic load controller, and the field effect transistor is controlled by the electronic load controller to switch the operation mode, and the resistor has a resistance A first end and a second end of a resistor. The first end of the resistor is electrically connected to the second end of the field effect transistor, and the second end of the resistor is electrically connected to the non-stubbing end of the secondary winding of the transformer. The discharge test system for a surgical instrument according to claim 5, wherein the control unit further includes a switch element having a first end of the switch element, a second end of the switch element, and a control end of the switch element, The first end of the switch element is electrically connected to the first end of the gas plasma arrester, the second end of the switch element is electrically connected to the second end of the resistor, the control end of the switch element is electrically connected to the electronic load controller, and the switch element can pass through the The control terminal of the switching element is controlled by the electronic load controller to switch between an on state and an open state. The discharge test system for surgical instruments according to claim 4, wherein the high-voltage generating unit includes a power factor corrector, a synchronous rectification step-down converter, and a single-phase sine wave pulse width modulation high-frequency inverter The power factor corrector is electrically connected to the AC voltage source and the synchronous rectification and step-down converter, and the single-phase sine wave pulse width modulation high-frequency inverter is electrically connected to the synchronous rectification and step-down converter and the transformer The single-phase sine wave pulse width modulation high-frequency inverter can output the first output voltage and can adjust an operating frequency of the waveform of the first output voltage on the dotted end and the non-dotted end of the primary winding. The discharge test system for a surgical instrument according to claim 7, wherein the synchronous rectification step-down converter includes an upper bridge switch, a lower bridge switch, a first inductor, and a first output capacitor, and the upper bridge switch has A first end of an upper bridge switch and a second end of an upper bridge switch. The first end of the upper bridge switch is electrically connected to the power factor corrector, and the upper bridge switch is controlled to switch between a conducting state and a non-conducting state In between, the lower bridge switch has a first end of a lower bridge switch and a second end of the lower bridge switch. The first end of the lower bridge switch is electrically connected to the second end of the upper bridge switch, and the second end of the lower bridge switch is electrically connected to the power. Because of the corrector and the low-bridge switch is controlled to switch between the conducting state and the non-conducting state, the conducting state of the high-bridge switch and the low-bridge switch are controlled to be opposite, and the first inductor has a first inductance. Terminal, and a second terminal of a first inductor, the first terminal of the first inductor is electrically connected to the first terminal of the lower bridge switch, the first output capacitor has a first terminal of a first output capacitor, and a first terminal of a first output capacitor At two ends, the first end of the first output capacitor is electrically connected to the second end of the first inductor. The discharge test system for surgical instruments according to claim 7, wherein the single-phase sine wave pulse width modulation high frequency inverter includes an input capacitor, a first switch, a second switch, and a third switch , A fourth switch, a second inductor, and a second output capacitor, the input capacitor having a first end of an input capacitor, and a second end of an input capacitor, the first end of the input capacitor and the second end of the input capacitor Are electrically connected to the synchronous rectification buck converter, the first switch has a first end of a first switch, and a second end of a first switch, the first end of the first switch is electrically connected to the first end of the input capacitor, and The first switch is controlled to switch between a conducting state and a non-conducting state. The second switch has a first end of a second switch and a second end of a second switch. The second end of the second switch is electrically connected to the Input the second end of the capacitor, and the second switch is controlled to switch between the conducting state and the non-conducting state. The third switch has a first end of a third switch and a second end of a third switch. The first end of the switch is electrically connected to the second end of the first switch, the second end of the third switch is electrically connected to the second end of the input capacitor, and the third switch is controlled to switch between a conducting state and a non-conducting state. The fourth switch has a first end of a fourth switch and a second end of a fourth switch. The first end of the fourth switch is electrically connected to the first end of the input capacitor, and the second end of the fourth switch is electrically connected to the second switch The first terminal, and the fourth switch is controlled to switch between the conducting state and the non-conducting state, the second inductor has a second inductor first terminal, and a second inductor second terminal, the second inductor One end is electrically connected to the second end of the first switch. The second output capacitor has a first end of a second output capacitor and a second end of a second output capacitor. The first end of the second output capacitor is electrically connected to the second inductor The second end and the dotted end of the primary winding of the transformer, and the second end of the second output capacitor is electrically connected to the first end of the second switch and the non-dotted end of the primary winding of the transformer.

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