TWI693919B - Electrical discharge testing method for surgical instruments - Google Patents

Abstract

An electrical discharge testing method for a surgical instrument includes a setup step, a plasma discharge step and a determination step. The setup step includes a controller of an electrical discharging testing circuit regulating a test current flowing through a gas plasma lightning arrester. The plasma discharge step includes the gas plasma lightning arrester receiving the test current and generating a plasma discharge; and building a lightning arrester voltage and a lightning arrester current at the instance of the plasma discharge. Dynamic impedance of the surgical instrument is related to a result of the lightning arrester voltage divided by the lightning arrester current. The determination step includes a determination unit measuring the dynamic impedance, comparing the dynamic impedance and a first threshold value predefined, and producing a determination result.

Description

Surgical instrument discharge test method

The invention relates to a discharge test method of a surgical instrument, in particular to a discharge test method of a surgical instrument by using a discharge of a gas plasma arrester to find a dynamic impedance of a surgical instrument, and judging its superiority or inferiority.

Referring 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, so that the water in the human tissue quickly evaporates, and finally achieve tissue separation or blood coagulation The function of the surgical instrument 100 is an electric pen 101 and a circuit patch 102, or a tissue scissors 103. The general operation of electrocautery surgery is to use surgical instrument 100 and an electrosurgical generator (Electrosurgical generator) 200. The electrocautery generator 200 generates a high-frequency, high-voltage AC voltage and current to drive the surgical instrument 100 to generate thermal energy for surgery Electric surgery.

The electric cauterization generator 200 has a positive output terminal and a negative output terminal, wherein the electric pen 101 is also called a unipolar electric knife, and is used in conjunction with the circuit patch 102, the electric pen 101 is electrically connected to the electric cautery generator The positive output terminal of 200, the circuit patch 102 is electrically connected to the negative output terminal of the electrocautery generator 200, and the circuit patch 102 is adhered to the surgical site of the patient, then the high-frequency current generated by the electrocautery generator 200 passes through After the output of the electrocautery pen 101 passes through the patient, it then flows from the circuit patch 102 back to the electrocautery generator 200 to form a current loop for electrosurgical operation. However, the organization cuts 103 is also called a bipolar electrocautery. A positive end and a negative end of the tissue cutter 103 are electrically connected to the positive output end and the negative output end of the electric cauterization generator 200, respectively. The frequency current forms the current loop through a positive end and a negative end of the tissue shear 103.

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

Therefore, the purpose of the present invention is to solve at least one of the above problems and to propose a discharge test method for surgical instruments.

Therefore, the discharge test method of the surgical instrument includes a setting step, a plasma discharge step, and a judgment step.

The setting step is to use a control unit of a discharge test circuit to control the magnitude of a test current flowing through a gas plasma arrester. The plasma discharge step is to use the gas plasma arrester to receive the test current and generate a plasma discharge , A surge arrester voltage and a surge arrester current are generated at the moment of the plasma discharge, wherein a dynamic impedance of a surgical instrument is related to the surge arrester voltage divided by the surge arrester current, the judgment step is to set the dynamic impedance using a judgment unit, And comparing the dynamic impedance with a first threshold stored in the judgment unit to generate a judgment result.

Further, the discharge test method of the surgical instrument further includes an installation step performed before the setting step. The installation step is to connect the surgical instrument between a high-voltage generating device and the discharge test circuit.

Further, the discharge test method of the surgical instrument further includes a starting step performed after the judging step, the starting step is to use the control unit to control the current flowing through the surgical instrument to return directly to the current without passing through the gas plasma arrester The high-voltage generating device then uses the high-voltage generating device to set the operation mode to perform the electrosurgical operation.

Further, the gas plasma arrester has a first end of the gas plasma arrester and a second end of the gas plasma arrester, and the first end of the gas plasma arrester is electrically connected to the surgical instrument.

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 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, and the second field effect transistor 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 gas plasma arrester At 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 switching element control end in a Switching between an on state and an open state, the switching element normally maintains the open state.

Further, in the starting step, the electronic load controller is used to control the field effect transistor to operate in a cut-off zone, and then the electronic load controller is used to generate a switch control signal, and the switching element receives the switch control signal and receives The switch control signal controls the transition to the conductive state, and then the current flowing through the surgical instrument directly passes through the switch element and flows back to the high-voltage generating device.

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

1. Through the plasma discharge step, the gas plasma surge arrester of the discharge test circuit generates the surge arrester voltage and the surge arrester current at the instant when the plasma discharge occurs, to obtain the dynamic impedance of the surgical instrument, and then borrow In this judgment step, the judgment unit judges whether the surgical instrument is good or bad according to the dynamic impedance, so that the medical staff can decide whether to use the surgical instrument according to the result, and avoid using the unusable surgical instrument during the surgical procedure The disadvantages.

2. In the starting step, the switching element can be switched between the conductive state and the open state by the electronic load controller, then after the test of the surgical instrument is completed, the switching element is controlled by the conductive state, Therefore, the impedance value of the surgical instrument operating at its own can be directly used without being affected by the discharge test circuit, which is quite convenient.

(1): High voltage generating device

(11): High voltage generating unit

(111): Power factor modifier

(112): Synchronous rectification buck converter

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

(114): Controller

(115): drive

(1151): The first comparator

(1152): Second comparator

(1153): The 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 ): the first end of the 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): circuit patch

(103): tissue shear

(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 end 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 terminal of the first switch

(Q _1b ): the second terminal of the first switch

(Q ₂ ): Second switch

(Q _2a ): the first end of the second switch

(Q _2b ): the second terminal of the second switch

(Q ₃ ): third switch

(Q _3a ): the first end of the third switch

(Q _3b ): the second terminal of the third switch

(Q ₄ ): fourth switch

(Q _4a ): the first end of the fourth switch

(Q _4b ): the second terminal of the fourth switch

(Q ₅ ): Fifth switch

(Q _5a ): the first end of the fifth switch

(Q _5b ): the second terminal of the fifth switch

(Q ₆ ): sixth switch

(Q _6a ): the first end of the sixth switch

(Q _6b ): the second terminal of the sixth switch

(Q): Field effect transistor

(Q _a ): the first end of the field effect transistor

(Q _b ): Field effect transistor second end

(L ₁ ): the 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 ): the first output capacitor

(C _o1a ): the first end of the first output capacitor

(C _o1b ): the second terminal of the first output capacitor

(C _o2 ): second output capacitor

(C _o2a ): the first end of the second output capacitor

(C _o2b ): the second terminal 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 procedure

(S3): plasma discharge step

(S4): Judgment step

(S5): Startup steps

[Figure 1] is a schematic perspective view illustrating a surgical instrument and an electric cautery generator currently in use.

[Second figure] is a block diagram illustrating an embodiment of a discharge test system of a surgical instrument for performing the discharge test method of the surgical instrument of the present invention.

[Third figure] is a circuit diagram illustrating a circuit of a synchronous rectification buck converter of the discharge test system.

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

[Fifth figure] is a waveform diagram illustrating that a high voltage generating device of the discharge test system operates in a cutting mode.

[Figure 6] is a waveform diagram illustrating that the high voltage generating device of the discharge test system operates in a solidification mode.

[Seventh figure] is a waveform diagram illustrating that the high voltage generating device of the discharge test system operates in a hybrid mode.

[Figure 8] is a step diagram illustrating the steps performed by this embodiment.

[Figure 9A] is a schematic perspective view illustrating that the discharge test system is connected to a tissue shear.

[Figure 9B] is a three-dimensional schematic diagram illustrating that the electric discharge test system is connected with an electric pen and a circuit patch.

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

Referring to the second to fourth figures, a discharge test system of a surgical instrument is suitable for an AC voltage source and a surgical instrument 100. To perform an embodiment of a discharge test method of a surgical instrument of the present invention, the surgical instrument 100 is in use Prior to this, the pros and cons can be judged to determine whether the surgical instrument 100 is to be used. The AC voltage source is used to generate an AC input voltage V _AC . The surgical instrument 100 is an electrocautery pen 101 and a primary circuit patch 102, or a tissue scissors 103. The electric pen 101 includes a positive pole, the circuit patch 102 includes a negative terminal, and the electric pen 101 and the circuit patch 102 are used in conjunction with each other. The tissue shear 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 generates 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 modulated RF inverter (SPWM RF inverter) 113, a controller 114, and a driver (SPWM Gate driver) 115.

The power factor modifier 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 an upper bridge switch first terminal Q _Ha and an upper bridge switch second terminal Q _Hb , the upper bridge switch first terminal Q _{Ha is} electrically connected to the power factor modifier 111, and the upper bridge The switch Q _H is controlled to switch between the conducting state and the non-conducting state. The upper bridge switch Q _H is an N-type metal oxide half field effect transistor, the first terminal Q _Ha of the upper bridge switch is a drain, and the second terminal Q _Hb of the upper bridge switch is a source. The lower bridge switch Q _L has a lower bridge switch first end Q _La and a lower bridge switch second end Q _Lb , the lower bridge switch first end Q _{La is} electrically connected to the upper bridge switch second end Q _Hb , the lower bridge The second terminal Q _{Lb of the} switch is electrically connected to the power factor modifier 111, and the lower bridge switch Q _L is controlled to switch between a conducting state and a non-conducting state. The lower bridge switch Q _L is an N-type metal oxide half field effect transistor, the first end Q _La of the lower bridge switch is a drain, and the second end Q _Lb of the lower 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 modifier 111 caused by the upper bridge switch Q _H and the lower bridge switch Q _{L being} turned on at the same time. The first inductance L ₁ has a first inductance first end L _1a and a first inductance second end L _1b . The first inductance first end L _{1a is} electrically connected to the first end of the lower bridge switch Q _La , the The first output capacitor C _o1 has a first output capacitor first terminal C _o1a and a first output capacitor second terminal C _o1b . The first output capacitor first terminal C _{o1a is} electrically connected to the first inductor second terminal L _1b . Therefore, when the upper bridge switch Q _{H is} turned on, the first inductor L ₁ stores energy; when the upper bridge switch Q _{H is} turned off, the lower 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 inductance L ₂ , and a second output capacitor C _o2 .

The input capacitor C _in has an input capacitor first terminal C _ina and an input capacitor second terminal C _inb . The input capacitor first terminal C _ina and the input capacitor second terminal C _{inb are both} electrically connected to the synchronous rectification 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 first terminal C _{ina of} the input capacitor, and the The first switch Q ₁ is controlled to switch between the conducting state and the non-conducting state. The first switch Q ₁ is an N-type metal oxide half field effect transistor, 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 second terminal C _{inb of} the input capacitor, and the first The two switch Q ₂ is controlled to switch between the conducting state and the non-conducting state. The second switch Q ₂ is an N-type metal oxide half field effect transistor, 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 metal oxide half field effect transistor, 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 first The four-switch second terminal Q _{4b is} electrically connected to the second switch first terminal Q _2a , 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 metal oxide half field effect transistor, the first end Q _4a of the fourth switch is a drain, and the second end Q _4b of the fourth switch is a source. The second inductance L ₂ has a second inductance first end L _2a and a second inductance second end L _2b . The second inductance first end L _{2a is} electrically connected to the first switch second end 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 C _{o2b 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 that controls 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 that controls the conducting 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 that controls the conducting state of the third switch Q ₃ . The fourth comparator 1154 has a non-inverting input terminal, an inverting input terminal, and an output terminal that controls the conduction state of the fourth switch Q ₄ .

The function of the single-phase sine wave pulse width modulation high-frequency inverter 113 is to convert a DC voltage to an AC voltage. The controller 114, the driver 115, and the single-phase sine wave pulse width modulation high-frequency inverse The operation principle of the transformer 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 to make the string The wave V _{sin is} input to the non-inverting input terminal of the first comparator 1151, and the triangle 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 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 side of the third comparator 1153 The phase input terminal and the sine wave V _{sin are} 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 outputs a first Three pulse width modulation signal V _gs3 to control 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, and after being low-pass filtered by the second inductor L ₂ and the second output capacitor C _o2 , the output first output voltage V _o1 is a high-frequency sine wave voltage, and An operating frequency of the first output voltage V _o1 can be arbitrarily adjusted. When performing an electric burn operation, the operating frequency of the first output voltage V _o1 is adjusted to 300 kHz to 500 kHz.

It should be added 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 operates under voltage mode control, the output The first output voltage V _o1 reaches the function of constant voltage. If the synchronous rectifier buck converter 112 operates under current mode control, the single-phase sine wave pulse width modulation outputs the first output of the high-frequency inverter 113. When the duty cycle d2 of an output voltage _Vo1 is fixed, the output of the single-phase sine wave pulse width modulation high-frequency inverter 113 can achieve the function of constant current.

The transformer 12 has a primary winding and a secondary winding. Each side 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 of the second output capacitor _Co2a , the non-dotted end of the primary winding of the transformer 12 is electrically connected to the second end of the second output capacitor _Co2b , the transformer 12 Receiving the first output voltage V _{o1 of} the single-phase sine wave pulse width modulation high-frequency inverter 113, the first output voltage V _{o1 is} boosted in 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 first terminal Q _{5a of the} fifth switch and a second terminal Q _5b of the fifth switch. The first terminal Q _{5a of} the fifth switch is electrically connected to the dotted end 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 metal oxide half field effect transistor, 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 metal oxide half field effect transistor, 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, Q ₆ of the sixth switch receives the first output voltage V _o1, and a control signal to control each of the pause interval between the first two cycles of the output voltage V _o1 according to the output mode, so that the first 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 V _o2 , so that the operation mode of the second output voltage V _o2 can be divided into three modes:

(1) Cutting mode: The second output voltage V _o2 is a continuous voltage waveform, as shown in the fifth figure, the period is set to 100%, the intermittent interval is zero, and the cutting mode does not contact human tissue, The tip of the surgical instrument 100 is used to cut human tissue.

(2) Coagulation mode: The second output voltage V _o2 is a discontinuous voltage waveform, as shown in the sixth figure, the period is set to 6% of the 100% cycle, and the coagulation mode is a large-area electrode using the surgical instrument 100 Close the body's blood vessels to achieve the purpose of hemostasis.

(3) Mixed mode: The second output voltage V _o2 is a discontinuous voltage waveform, as shown in the seventh figure, the cycle is set to 50% of the 100% cycle, and the mixed mode is to use the surgical instrument 100 for cutting and coagulation The function.

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

The gas plasma arrester 21 has a gas plasma arrester first end 21 _a and a gas plasma arrester second end 21 _b . The gas plasma arrester first end 21 _{a is} electrically connected to the negative end 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 field effect transistor first end Q _a and a field effect transistor second end Q _b , the field effect transistor first end Q _{a is} electrically connected to the cathode of the diode D and the electron the load controller 221, a second terminal of the field effect transistor Q _b is electrically connected to the electronic load controller 221, and the field effect transistor Q load by the electronic controller 221 controls to switch the operation mode. In this example, the field effect transistor Q is an N-type metal oxide half field effect transistor, the first end Q _a of the field effect transistor is a drain, and the second end 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 A second end of the non-dotted end of the secondary winding of the transformer 12. The switch element 222 has a switch element first end 222 _a , a switch element second end 222 _b , and a switch element control end 222 _c , the switch element first end 222 _{a is} electrically connected to the gas plasma arrester first end 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 pass the control end 222 _{c of} the switching element Under the control of the electronic load controller 221, it switches between an on state and an open state. The switch element 222 is a relay. The switch element 222 is normally open. 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 conducting state.

The judging unit 3 stores a first critical value, and the first critical value is an impedance value, which is related to a critical value of whether the surgical instrument 100 can continue to use the boundary. The judging unit 3 similarly has a logical comparison and judgment , An electronic device for computing functions. It should be noted that the judgment unit 3 can further store a plurality of threshold values, which are respectively related to different levels of judgment according to different models of the plurality of surgical instruments 100 or subdivided into good, usable, unusable, etc. Multiple impedance values. In this example, the determination unit 3 stores the first threshold value for illustration.

Referring to the second, fourth, and eighth figures, 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 starting 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 terminal of the tissue shear 103 to the second terminal of the high-voltage generating device 1 The positive pole of the output voltage V _{o2 and} the negative pole of the tissue shear 103 are connected to the first end 21 _a of the gas plasma surge arrester 21 of the gas plasma surge arrester 21 of the discharge test circuit 2. The appearance is shown in the ninth figure A. Or connect the electrocautery pen 101 to the positive pole of the second output voltage V _o2 of the high-voltage generating device 1, and connect the circuit patch 102 to the gas plasma arrester 21 of the gas plasma arrester 21 of the discharge test circuit 2 first End 21 _a , the appearance is shown in Figure 9B. Next, this setting step S2 is performed.

Setting step S2: The control unit 22 of the discharge test circuit 2 is used to control the magnitude of a test current i _t flowing through the gas plasma arrester 21. 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 The field effect transistor Q becomes a variable resistor of voltage control type, according to which the size of the test current i flowing through the gas plasma arrester 21 is controlled to achieve the current limiting function to avoid the gas plasma arrester 21 After that (when the plasma is discharged), an excessive current is generated. Next, this plasma discharge step S3 is performed.

Plasma discharge step S3: The gas plasma surge arrester 21 receives the test current i and generates a plasma discharge. At the moment of the plasma discharge, a surge arrester voltage and a surge arrester current are generated. Among them, a dynamic of the surgical instrument 100 The impedance is related to the voltage of the arrester divided by the current of the arrester. 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 indicates the operation If the condition of the instrument 100 is no longer suitable for reuse, the medical personnel may discard the surgical instrument 100. If the dynamic impedance is smaller than the first threshold, it indicates that the condition of the surgical instrument 100 can be reused, and then proceed to the start step S5 Therefore, the medical staff can know whether the surgical instrument 100 can continue to be used according to the judgment result.

Starting step S5: the electronic load controller 221 is used to control the field effect transistor Q to operate in a cut-off zone, and then the electronic load controller 221 of the control unit 22 is used to generate the switch control signal S _Relay , and the switch element 222 receives When the switch control signal S _Relay is controlled by the switch control signal S _{Relay to} change into a conductive state, the current flowing through the surgical instrument 100 will directly flow back to the high-voltage generating device 1 after passing through the switching element 222, 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 electric burn operation.

In summary, the gas surge arrester 21 of the discharge test circuit 2 generates the surge arrester voltage and the surge arrester current at the instant when the plasma discharge occurs to obtain the dynamic impedance of the surgical instrument 100, and by using the The judging unit 3 judges whether the surgical instrument 100 is good or bad 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 using the surgical instrument 100 that is unusable during the surgical procedure Then, the switching element 222 can be switched between the conductive state and the open state by the electronic load controller 221, then after the test of the surgical instrument 100 is completed, the switching element 222 is controlled by the conductive state, then The impedance value of the surgical instrument 100 operating at its own can be directly used without being affected by the discharge test circuit 2, which is quite convenient, and more preferably, the high-voltage generating device 1 uses the synchronous rectification step-down converter 112 and the The single-phase sine wave pulse width modulation high-frequency inverter 113 can arbitrarily adjust the output sine wave waveform to meet the use of electric surgery.

Based on the description of the above embodiments, the operation, use and effects of the present invention can be fully understood. However, the above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the implementation of the present invention. The scope, that is, simple equivalent changes and modifications made in accordance with the scope of the present invention's patent application and the description of the invention, is within the scope of the present invention.

(S1): Installation steps

(S2): Setting procedure

(S3): plasma discharge step

(S4): Judgment step

(S5): Startup steps

Claims (7)

A discharge test method for surgical instruments, comprising: a setting step, a control unit of a discharge test circuit is used to control the magnitude of a test current flowing through a gas plasma arrester; a plasma discharge step uses the gas plasma arrester Receiving the test current and generating a plasma discharge, generating a surge arrester voltage and a surge arrester current at the instant of the plasma discharge, wherein a dynamic impedance of a surgical instrument is related to the surge arrester voltage divided by the surge arrester current; and a judgment Step: Use a judgment unit to set the dynamic impedance and compare the dynamic impedance with a first threshold stored in the judgment unit to generate a judgment result. The discharge test method of a surgical instrument as described in item 1 of the patent application scope further includes an installation step performed before the setting step, the installation step is to connect the surgical instrument to a high-voltage generating device and the discharge test Between circuits. The discharge test method of a surgical instrument as described in item 2 of the patent application scope also includes a start-up step performed after the judgment step, the start-up step is to use the control unit to control the current flowing through the surgical instrument not to pass through the gas The plasma surge arrester directly flows back to the high-voltage generating device, and then uses the high-voltage generating device to set the operation mode to perform the electrosurgical operation. The discharge test method for surgical instruments as described in item 3 of the patent application scope, wherein the gas plasma arrester has a first end of the gas plasma arrester, and a second end of the gas plasma arrester, the gas plasma arrester One end is electrically connected to the surgical instrument. The discharge test method for surgical instruments as described in item 4 of the patent application scope, wherein the control unit includes a diode, a field effect transistor, an electronic load controller, and a resistor, the diode has an electrical connection An anode and a cathode at 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 cathode of the diode and the electronic load controller, and the second end of the field effect transistor is electrically connected 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 to the field effect Transistor second end. The discharge test method of a surgical instrument as described in item 5 of the patent scope, wherein 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 switching element At the control end, 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 It can be switched between an on state and an open circuit state through the control end of the switching element under the control of the electronic load controller. The normal state of the switching element is to maintain the open circuit state. The discharge test method of a surgical instrument as described in item 6 of the patent application scope, wherein in the starting step, the electronic load controller is used to control the field effect transistor to operate in a cut-off area, and then the electronic load control is used The switch generates a switch control signal. The switch element receives the switch control signal and is controlled by the switch control signal to change to the conductive state. Then, the current flowing through the surgical instrument directly passes through the switch element and flows back to the high-voltage generating device.

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