CN112869869A - Control method for detection and protection of high-frequency surgical equipment - Google Patents

Control method for detection and protection of high-frequency surgical equipment Download PDF

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Publication number
CN112869869A
CN112869869A CN202110173877.0A CN202110173877A CN112869869A CN 112869869 A CN112869869 A CN 112869869A CN 202110173877 A CN202110173877 A CN 202110173877A CN 112869869 A CN112869869 A CN 112869869A
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output
resistor
signal
capacitor
executing
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CN112869869B (en
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万晓东
马二鹏
韩致轲
于龙辛
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Shandong Xinhua Health Industry Co ltd
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Shandong Xinhua Health Industry Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00589—Coagulation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00827—Current
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00875—Resistance or impedance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00892—Voltage
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00898—Alarms or notifications created in response to an abnormal condition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A61B2018/1246—Generators therefor characterised by the output polarity
    • A61B2018/126—Generators therefor characterised by the output polarity bipolar

Abstract

The invention relates to a control method for detection and protection of high-frequency surgical equipment, belonging to the technical field of medical products such as high-frequency electrotomes and radio-frequency knives; the method comprises the following steps: step 1, acquiring a voltage signal Vout of current human tissue, a current signal Iout of current human tissue and a resistance signal dout of current starting resistance, and acquiring a pat voltage signal through an oscillation feedback circuit; step 2, judging whether the output mode is a unipolar output mode or a bipolar output mode according to whether the dout signal is in a high level or whether the bipolar pedal outputs, and executing step 3 if the output mode is the unipolar output mode; if the bipolar output mode is selected, go to step 12; not only can ensure the safety of the negative plate, but also can meet the requirement of timely coagulation; the bipolar coagulation instrument is suitable for a pedal mode and an automatic control mode during bipolar coagulation, can output low power to coagulate blood under the condition of short circuit of two forceps tips or detection of low resistance at two ends of the forceps, and cuts off output when coagulation is completed in a self-starting mode.

Description

Control method for detection and protection of high-frequency surgical equipment
Technical Field
The invention relates to a control method for detection and protection of high-frequency surgical equipment, and belongs to the technical field of medical products such as high-frequency electrotomes and radio-frequency knives.
Background
The high-frequency electrotome on the market at present is divided into two kinds in the aspect of negative plate (neutral electrode) detection:
the negative plate can be simply detected whether to be well connected or not, but can not be detected whether to be well adhered or not and the adhering area, and when the negative plate falls off to be smaller than the safe area, scalding can occur at the negative plate.
And (II) the sticking area can be detected, but only good and no alarm can be detected, and the alarm is disconnected to output if the good and no alarm is detected. Only two points can be detected, and the negative plate is normally output when well pasted; the alarm disconnection output is given when the pasting area drops to a safe area, so that a doctor can not use continuously without knowing when the negative plate begins to drop, the alarm is given when the negative plate drops to the safe area, the blood coagulation requirement of the doctor can not be met at the moment, the negative plate can only be continuously used after being pasted well, and unnecessary bleeding is brought to the patient easily due to untimely blood coagulation of the doctor.
Moreover, the electrocoagulation output of the high-frequency electrotome is mainly used for coagulation after a surgeon cuts human tissue or capillary bleeding, and currently, two bipolar control modes are foot control and self-starting control respectively.
(1) The electric knife on the market has no double-pole short-circuit protection
The existing commercial high-frequency electrotome has almost no measures on bipolar protection, when a bipolar instrument is used, the forceps tip is easy to touch by mistake, namely the instrument is short-circuited, the current is large, and destructive influence is caused on the instrument and a main machine of the equipment.
When using present market electrotome to carry out bipolar coagulation and carry out the blood coagulation, no matter use pedal control or use self-starting control, when the tweezers point mistake touches and takes place the short circuit, its tweezers both ends can produce instantaneous high voltage high frequency electricity, if under high-power output, still can produce high-voltage electric arc at the tweezers both ends, all be a hidden danger to doctor nurse patient, cause the influence to the operation easily.
(2) The electric knife on the market has no bipolar automatic cut-off output function
And a novice doctor is unskilled in bipolar use and cannot accurately judge whether the blood vessel is completely coagulated, so a bipolar protection control method is designed according to market demands.
(3) The electrotome on the market can not output corresponding low power according to a low impedance value, and only outputs according to the current set power, so that unnecessary harm can be caused to a patient.
Therefore, a control method for detecting and protecting the high-frequency surgical equipment is designed according to market demands.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and a control method for detecting and protecting high-frequency surgical equipment is provided, so that the safety of a negative plate can be ensured, and the requirement of timely blood coagulation can be met; the bipolar coagulation instrument is suitable for a pedal mode and an automatic control mode during bipolar coagulation, can output low power to coagulate blood under the condition of short circuit of two forceps tips or detection of low resistance at two ends of the forceps, and cuts off output when coagulation is completed in a self-starting mode.
The control method for detecting and protecting the high-frequency surgical equipment comprises the following steps:
step 1, acquiring a voltage signal Vout of current human tissue, a current signal Iout of current human tissue and a resistance signal dout of current starting resistance, and acquiring a pat voltage signal through an oscillation feedback circuit;
step 2, judging whether the output mode is a unipolar output mode or a bipolar output mode according to whether the dout signal is in a high level or whether the bipolar pedal outputs, and executing step 3 if the output mode is the unipolar output mode; if the bipolar output mode is selected, go to step 12;
step 3, judging whether unipolar power output exists or not according to the pat voltage signal, and if yes, executing step 4; if not, executing the step 9;
step 4, judging whether the voltage of the pat voltage signal is within an output threshold value, if so, executing step 5; if not, executing the step 8;
step 5, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, executing the step 7;
step 6, the panel displays the set power normally, does not give an alarm, and skips to the step 1 after the attack rate is output;
step 7, the panel displays the set power normally, gives an alarm, and skips to the step 1 after outputting the power;
step 8, displaying error codes on a panel, alarming, and skipping to the step 1 after power output is forbidden;
step 9, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 10; if not, executing the step 11;
step 10, the panel displays the set power normally, does not give an alarm, and skips to step 1 after the attack rate output is forbidden;
step 11, the panel displays the set power normally, gives an alarm, and jumps to step 1 after the attack rate output is forbidden;
step 12, calculating the size of a load resistor R;
step 13, setting a pedal mode or an automatic control mode, executing step 14 if the pedal mode or the automatic control mode is set, and executing step 20 if the pedal mode is set;
step 14, judging whether the operation is the first operation, if so, executing step 15, otherwise, executing step 19;
step 15, judging whether the resistance signal dout reaches an output threshold value, if so, executing step 16, otherwise, executing step 21;
step 16, judging whether the load resistance R is smaller than a normal threshold value, if so, executing step 17, otherwise, executing step 18;
step 17, after low power output, skipping to step 1;
step 18, after normal power output is carried out, skipping to step 1;
step 19, judging whether the load resistor R reaches the disconnection upper limit, if so, executing step 21, otherwise, jumping to step 16;
step 20, judging whether the bipolar pedals are output or not, if so, jumping to step 16, and if not, executing step 21;
and step 21, after the power output is forbidden, jumping to the step 1.
Collecting an analog signal pat through an oscillation feedback circuit, detecting a pat voltage signal collected by the circuit, judging whether power is output or not according to the pat signal, if not, only detecting whether the pat signal voltage is within a complete fit threshold value or not, if so, not alarming, and if not, alarming; if the output exists, detecting whether the pat signal voltage is within a threshold value, alarming if the pat signal voltage is not within the range, and alarming if the pat signal voltage is not within the range; judging whether the bonding is within a complete bonding threshold value within the range, and alarming but outputting normally when the bonding is not complete; when the device is completely attached, the alarm lamp is not used and the output is normal.
Through step 9, the threshold value is completely attached, a safe region which can output and alarm is added, the region can ensure that a negative plate alarm system starts to alarm and prompt a doctor when a negative plate starts to fall off in the operation process, the doctor can paste the negative plate in time, and the requirement of the doctor on blood coagulation or cutting is not influenced.
Ensure that when the negative plate begins to drop at the operation in-process negative plate alarm system begin to report to the police and indicate the doctor, can let the doctor in time paste the negative plate piece, can not influence the demand that the doctor urgently needed blood coagulation or cutting this moment.
In the automatic control mode, whether the resistance signal dout reaches the output threshold value is judged through step 15 during the first operation, so that the high-voltage arc generated during short circuit is avoided. In both the pedal mode and the automatic control mode, the size of the load resistor R is judged through step 16, and output can be performed with low power when the detection impedance is very low, and short-circuit alarm can not occur; the power output is forbidden when the load resistor R reaches the disconnection upper limit through the step 19, namely when the coagulation is finished or other human tissues with large impedance can be detected, the bipolar of the high-frequency electrotome automatically disconnects the output, and the condition of overhigh output power is avoided.
Preferably, the step 5 specifically includes the following steps:
step 501, detecting whether short-circuit protection, temporary load rate alarm and leakage current overproof faults affecting unipolar power output exist, and if yes, executing step 7; if not, go to step 502;
step 502, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, go to step 7.
And whether other faults influencing the output of the unipolar power exist can be detected simultaneously, such as short-circuit protection, transient rate alarm, excessive leakage current and the like, so that safety is ensured.
Preferably, the oscillation feedback circuit includes a three-point oscillation circuit, an impedance sensor T704, a neutral electrode impedance detection circuit, and a pat voltage signal generation circuit.
The three-point oscillating circuit is used for generating a positive sine waveform in a self-excitation mode, so that the alarm can be ensured under the condition that the electric knife does not output; the impedance value of a neutral electrode J704 on a negative plate is detected through an impedance sensor T704 and a neutral electrode impedance detection circuit, the ohm law shows that the impedance is increased when the area S is reduced, the amplitude of a sine wave is increased when the impedance value is increased, the amplitude of a waveform induced by a pat voltage signal generation circuit is also increased at the moment, then the rectification and the filtering are carried out, and finally a pat signal which is changed into an analog signal changed along with the change of a load is obtained; the falling condition of the negative plate can be fed back in real time.
Preferably, the three-point oscillation circuit comprises a triode Q703, wherein a base electrode of the triode Q703 is connected with one end of a resistor R723, a collector electrode is connected with one end of a capacitor C715 and an input end 5 of an impedance sensor T704, an emitter electrode is connected with one end of a resistor R724 and the other end of the capacitor C715, the other end of the capacitor C715 is further connected with an excitation voltage VDD and an input end 6 of the impedance sensor T704, the excitation voltage VDD is further connected with one end of a resistor R719, the other end of the resistor R724 is connected with an anode of a zener diode D717, a cathode of the zener diode D717 is connected with the other end of the resistor R723 and the other end of the resistor.
A positive sine waveform is generated by a three-point oscillating circuit in a self-excitation mode of an excitation voltage VDD, so that an alarm can be guaranteed under the condition that the electric knife does not output.
Preferably, the neutral electrode impedance detection circuit comprises a capacitor C713, one end of the capacitor C713 is connected with the input end 4 of the impedance sensor T704 and one end of the resistor R718, the other end of the capacitor C713 is connected with one end of the capacitor C718, the other end of the resistor R718 and one end of the resistor R722, the other end of the capacitor C713 is further connected with an output port, the other end of the capacitor C718 is connected with the input end 3 of the impedance sensor T704 and the other end of the resistor R722, and the other end of the resistor R722 and one end of the resistor R718 are connected with the.
For detecting the impedance value of the neutral electrode J704 on the negative plate, the positive-going wave amplitude increases as the impedance value increases.
Preferably, the pat voltage signal generating circuit includes a capacitance-variable diode D716, an anode of the capacitance-variable diode D716 is connected to the output end 2 of the impedance sensor T704, a cathode of the capacitance-variable diode D716 is connected to one end of a capacitor C719 and one end of an inductor L706, the other end of the inductor L706 is connected to one end of a capacitor C720 and one end of a resistor R725, the other end of the resistor R725 is connected to the other end of the capacitor C720, the other end of the capacitor C719 and the output end 1 of the impedance sensor T704, the output end 1 of the impedance sensor T704 is further connected to the other end of a resistor R724, the other end of the resistor R725 is.
The positive sine wave amplitude is induced through the output end of the impedance sensor T704, then rectification and filtering are carried out, and finally the pat signal which is changed into an analog signal along with the change of the load is obtained.
Preferably, the output threshold value is in the range of 0-1V, that is, the negative plate paste impedance is 0-150 Ω; the range of the complete attaching threshold is 0-0.5V, namely the attaching impedance of the negative plate is 0-100 omega.
When the impedance is lower than 150 omega, the current density is less than 10mA/cm2, and the patient can not be scalded by combining the resistivity calculation formula with the area of the standard negative plate on the market at present.
Preferably, the resistance signal dout of the current starting resistor is collected by a first signal module, and the first signal circuit includes a colpitts oscillating circuit, a first transformer T001, and a first rectifying and filtering circuit.
The cobratiz oscillation circuit regularly sends out oscillation pulses, and aims to provide a detection power supply, a changed pulse signal is conducted to a secondary side from a primary side of a first transformer T001, a stable and smooth direct current is obtained after the pulse signal is rectified by a diode of a first rectification filter circuit and filtered by a capacitor, and a corresponding bipolar detection signal is fed back to a single chip microcomputer to be received and control the output of a bipolar port.
Preferably, the current voltage signal Vout of the human tissue and the current signal Iout of the human tissue are collected by a second signal module, and the second signal module includes a second isolation transformer T002 and a second rectification filter circuit connected in parallel at two ends of the output port, and further includes a third isolation transformer T003 and a third rectification filter circuit connected in series at two ends of the output port.
The primary side of a second isolation transformer T002 is connected in parallel with two ends of an output port, high-voltage alternating current is converted into low-voltage alternating current which is connected in series and in parallel through a diode and a resistor of a second rectifying and filtering circuit, the low-voltage alternating current signal is rectified and filtered to obtain a direct-current voltage signal which is fed back to the single chip microcomputer, the direct-current voltage signal is Vout, and the current voltage signal of human tissues is collected.
The third isolation transformer T003 is connected in series at two ends of the output port, high-voltage alternating current is changed into low-voltage alternating current, and the low-voltage alternating current is rectified and filtered through the series-parallel connection of a diode and a resistor of the third rectifying and filtering circuit to obtain a direct-current voltage signal which is fed back to the singlechip, wherein the direct-current voltage signal is Iout, and the current signal of the current human tissue is collected.
Preferably, the load resistance R is calculated by the following formula (1):
Figure BDA0002939814040000051
and obtaining the current resistance value of the human tissue through Vout/Iout. Whether a small power output or a large power output is required is judged based on the resistance value.
Preferably, the range of the output threshold is below 1000-1500 ohms, the range of the normal threshold is below 25-50 ohms, and the range of the upper limit of disconnection is above 380-420 ohms.
It can be detected that coagulation is not performed at the original power but performed at a smaller power in a smaller human tissue (resistance value of 25 to 50 ohms).
Compared with the prior art, the invention has the following beneficial effects:
(1) the control method for the detection and protection of the high-frequency surgical equipment can ensure the safety of the negative plate and meet the requirement of timely blood coagulation;
(2) a safety region which can output and alarm is added, and the region can ensure that a negative plate alarm system starts to alarm and prompt a doctor when a negative plate falls off in the operation process, so that the doctor can paste the negative plate in time, and the requirement of the doctor on blood coagulation or cutting is not influenced;
(3) the three-point oscillating circuit is used for generating a positive sine waveform in a self-excitation mode, so that the alarm can be ensured under the condition that the electric knife does not output; the impedance value of a neutral electrode J704 on a negative plate is detected through an impedance sensor T704 and a neutral electrode impedance detection circuit, the ohm law shows that the impedance is increased when the area S is reduced, the amplitude of a sine wave is increased when the impedance value is increased, the amplitude of a waveform induced by a pat voltage signal generation circuit is also increased at the moment, then the rectification and the filtering are carried out, and finally a pat signal which is changed into an analog signal changed along with the change of a load is obtained; the falling condition of the negative plate can be fed back in real time.
(4) When bipolar coagulation, be applicable to pedal mode and automatic control mode, can detect output miniwatt and come the blood coagulation under the low resistance to two tweezers point short circuits or tweezers both ends to disconnection output when accomplishing the blood coagulation under the self-starting mode.
Drawings
FIG. 1 is a flow chart of a control method for detection and protection of the HF surgical apparatus according to the present invention;
FIG. 2 is a circuit diagram of a control method for the detection and protection of the HF surgical apparatus according to the present invention;
FIG. 3 is a graph of a pat voltage signal not within the output threshold of the present invention;
FIG. 4 is a graph of a pat voltage signal not within the full-fit threshold of the present invention;
FIG. 5 is a graph of a pat voltage signal within the full-fit threshold of the present invention.
In the figure: 1. a three-point oscillation circuit; 2. a neutral electrode impedance detection circuit; 3. a pat voltage signal generation circuit; 4. a cobratiz oscillation circuit; 5. a first rectifying and filtering circuit; 6. a second rectifying and filtering circuit; 7. and a third rectifying and filtering circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1-2, the control method for detecting and protecting the high-frequency surgical equipment according to the present invention comprises the following steps:
step 1, acquiring a voltage signal Vout of current human tissue, a current signal Iout of current human tissue and a resistance signal dout of current starting resistance, and acquiring a pat voltage signal through an oscillation feedback circuit;
step 2, judging whether the output mode is a unipolar output mode or a bipolar output mode according to whether the dout signal is in a high level or whether the bipolar pedal outputs, and executing step 3 if the output mode is the unipolar output mode; if the bipolar output mode is selected, go to step 12;
step 3, judging whether unipolar power output exists or not according to the pat voltage signal, and if yes, executing step 4; if not, executing the step 9;
step 4, judging whether the voltage of the pat voltage signal is within an output threshold value, if so, executing step 5; if not, executing the step 8;
step 5, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, executing the step 7;
step 6, the panel displays the set power normally, does not give an alarm, and skips to the step 1 after the attack rate is output;
step 7, the panel displays the set power normally, gives an alarm, and skips to the step 1 after outputting the power;
step 8, displaying error codes on a panel, alarming, and skipping to the step 1 after power output is forbidden;
step 9, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 10; if not, executing the step 11;
step 10, the panel displays the set power normally, does not give an alarm, and skips to step 1 after the attack rate output is forbidden;
step 11, the panel displays the set power normally, gives an alarm, and jumps to step 1 after the attack rate output is forbidden;
step 12, calculating the size of a load resistor R;
step 13, setting a pedal mode or an automatic control mode, executing step 14 if the pedal mode or the automatic control mode is set, and executing step 20 if the pedal mode is set;
step 14, judging whether the operation is the first operation, if so, executing step 15, otherwise, executing step 19;
step 15, judging whether the resistance signal dout reaches an output threshold value, if so, executing step 16, otherwise, executing step 21;
step 16, judging whether the load resistance R is smaller than a normal threshold value, if so, executing step 17, otherwise, executing step 18;
step 17, after low power output, skipping to step 1;
step 18, after normal power output is carried out, skipping to step 1;
step 19, judging whether the load resistor R reaches the disconnection upper limit, if so, executing step 21, otherwise, jumping to step 16;
step 20, judging whether the bipolar pedals are output or not, if so, jumping to step 16, and if not, executing step 21;
and step 21, after the power output is forbidden, jumping to the step 1.
Collecting an analog signal pat through an oscillation feedback circuit, detecting a pat voltage signal collected by the circuit, judging whether power is output or not according to the pat signal, if not, only detecting whether the pat signal voltage meets a complete bonding threshold or not, if so, not alarming, and if not, alarming; if the output exists, detecting whether the pat signal voltage is within a threshold value, if the pat signal voltage is not within the threshold value, alarming and alarming if the pat signal voltage is not within the threshold value as shown in the graph 3, and outputting an error code alarm; judging whether the bonding is within the threshold value of complete bonding within the range, and alarming but outputting normally if the bonding is incomplete as shown in FIG. 4; when the fitting is completed as shown in fig. 5, the alarm lamp is not turned on and the output is normal.
Through step 9, the threshold value is completely attached, a safe region which can output and alarm is added, the region can ensure that a negative plate alarm system starts to alarm and prompt a doctor when a negative plate starts to fall off in the operation process, the doctor can paste the negative plate in time, and the requirement of the doctor on blood coagulation or cutting is not influenced.
Ensure that when the negative plate begins to drop at the operation in-process negative plate alarm system begin to report to the police and indicate the doctor, can let the doctor in time paste the negative plate piece, can not influence the demand that the doctor urgently needed blood coagulation or cutting this moment.
The control method for the detection and protection of the high-frequency surgical equipment can be realized by a detection part through a single chip microcomputer; the alarm can be made by a buzzer and a panel display alarm lamp flashing mode. In step 2, the dout signal is in a bipolar output mode when being in a high level or bipolar pedal output, otherwise, the dout signal is in a unipolar output mode.
In the automatic control mode, whether the resistance signal dout reaches the output threshold value is judged through step 15 during the first operation, so that the high-voltage arc generated during short circuit is avoided. In both the pedal mode and the automatic control mode, the size of the load resistor R is judged through step 16, and output can be performed with low power when the detection impedance is very low, and short-circuit alarm can not occur; the power output is forbidden when the load resistor R reaches the disconnection upper limit through the step 19, namely when the coagulation is finished or other human tissues with large impedance can be detected, the bipolar of the high-frequency electrotome automatically disconnects the output, and the condition of overhigh output power is avoided.
Wherein, the step 5 specifically comprises the following steps:
step 501, detecting whether short-circuit protection, temporary load rate alarm and leakage current overproof faults affecting unipolar power output exist, and if yes, executing step 7; if not, go to step 502;
step 502, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, go to step 7.
And whether other faults influencing the output of the unipolar power exist can be detected simultaneously, such as short-circuit protection, transient rate alarm, excessive leakage current and the like, so that safety is ensured.
The oscillation feedback circuit comprises a three-point oscillation circuit 1, an impedance sensor T704, a neutral electrode impedance detection circuit 2 and a pat voltage signal generation circuit 3.
The three-point oscillating circuit 1 is used for generating a positive-going waveform in a self-excitation mode, and can alarm under the condition that the electric knife does not output; the impedance value of the neutral electrode J704 on the negative plate is detected through the impedance sensor T704 and the neutral electrode impedance detection circuit 2, the ohm law shows that the impedance is increased when the area S is reduced, the amplitude of sine wave is increased when the impedance value is increased, the amplitude of a waveform induced by the pat voltage signal generation circuit 3 is also increased at the moment, then the rectification and the filtering are carried out, and finally the obtained pat signal is changed into an analog signal which is changed along with the change of the load; the falling condition of the negative plate can be fed back in real time.
The three-point oscillation circuit 1 comprises a triode Q703, wherein the base electrode of the triode Q703 is connected with one end of a resistor R723, one end of a collector electrode of the triode Q703 is connected with one end of a capacitor C715 and the input end 5 of an impedance sensor T704, one end of an emitter electrode of the capacitor R724 is connected with the other end of the capacitor C715, the other end of the capacitor C715 is also connected with an excitation voltage VDD and the input end 6 of the impedance sensor T704, the excitation voltage VDD is also connected with one end of a resistor R719, the other end of the resistor R724 is connected with the anode of a voltage stabilizing diode D717, the cathode of the voltage stabilizing diode D717 is connected with the other end of the resistor R723 and the.
A positive sine waveform is generated by the three-point oscillating circuit 1 in a self-excited mode of the excitation voltage VDD, and an alarm can be guaranteed even if the electric knife does not output.
The neutral electrode impedance detection circuit 2 comprises a capacitor C713, one end of the capacitor C713 is connected with an input end 4 of an impedance sensor T704 and one end of a resistor R718, the other end of the capacitor C713 is connected with one end of a capacitor C718, the other end of the resistor R718 and one end of a resistor R722, the other end of the capacitor C713 is also connected with an output port, the other end of the capacitor C718 is connected with an input end 3 of the impedance sensor T704 and the other end of the resistor R722, and the other end of the resistor R722 and one end of the resistor R718 are connected with a neutral.
For detecting the impedance value of the neutral electrode J704 on the negative plate, the positive-going wave amplitude increases as the impedance value increases.
When power is output, the output port inputs power.
The pat voltage signal generating circuit 3 comprises a capacitance-variable diode D716, the positive electrode of the capacitance-variable diode D716 is connected with the output end 2 of the impedance sensor T704, the negative electrode of the capacitance-variable diode D716 is connected with one end of a capacitor C719 and one end of an inductor L706, the other end of the inductor L706 is connected with one end of a capacitor C720 and one end of a resistor R725, the other end of the resistor R725 is connected with the other end of the capacitor C720, the other end of the capacitor C719 and the output end 1 of the impedance sensor T704, the output end 1 of the impedance sensor T704 is also connected with the other end of a resistor R724, the other end of the resistor R725.
Here, the pat voltage signal is output from the pat voltage signal output port and sent to the detection portion.
The positive sine wave amplitude is induced through the output end of the impedance sensor T704, then rectification and filtering are carried out, and finally the pat signal which is changed into an analog signal along with the change of the load is obtained.
Wherein the range of the output threshold value is 0-1V, namely the sticking impedance of the negative plate is 0-150 omega; the range of the complete attaching threshold is 0-0.5V, namely the attaching impedance of the negative plate is 0-100 omega.
When the impedance is lower than 150 omega, the current density is less than 10mA/cm2, and the patient can not be scalded by combining the resistivity calculation formula with the area of the standard negative plate on the market at present.
The resistance signal dout of the current starting resistor is acquired through a first signal module, and the first signal circuit comprises a colpitts oscillating circuit 4, a first transformer T001 and a first rectifying and filtering circuit 5.
The cobratiz oscillation circuit 1 regularly sends out oscillation pulses, and aims to provide a detection power supply, a changed pulse signal is conducted to the secondary side from the primary side of the first transformer T001, a stable and smooth direct current is obtained after the pulse signal is rectified by a diode of the first rectification filter circuit 5 and filtered by a capacitor, and a corresponding bipolar detection signal is fed back to the single chip microcomputer to be received and control the output of a bipolar port.
The current voltage signal Vout and the current signal Iout of the current human tissue are acquired through a second signal module, and the second signal module comprises a second isolation transformer T002 and a second rectification filter circuit 6 which are connected in parallel at two ends of an output port, and further comprises a third isolation transformer T003 and a third rectification filter circuit 7 which are connected in series at two ends of the output port.
The primary side of a second isolation transformer T002 is connected in parallel with two ends of an output port, high-voltage alternating current is converted into low-voltage alternating current which is connected in series and in parallel through a diode and a resistor of a second rectifying and filtering circuit 6, a low-voltage alternating current signal is rectified and filtered to obtain a direct-current voltage signal which is fed back to the single chip microcomputer, the direct-current voltage signal is Vout, and the current voltage signal of human tissues is collected.
The third isolation transformer T003 is connected in series at two ends of the output port, high-voltage alternating current is changed into low-voltage alternating current, and the low-voltage alternating current is rectified and filtered through the series-parallel connection of the diode and the resistor of the third rectifying and filtering circuit 7 to obtain a direct-current voltage signal which is fed back to the singlechip, wherein the direct-current voltage signal is Iout, and the current signal of the current human tissue is collected.
Wherein the load resistance R is calculated by the following formula (1):
Figure BDA0002939814040000091
and obtaining the current resistance value of the human tissue through Vout/Iout. Whether a small power output or a large power output is required is judged based on the resistance value.
Wherein the range of the output threshold is below 1000-1500 ohms.
Wherein the normal threshold value is in the range of 25-50 ohms or less.
It can be detected that coagulation is not performed at the original power but performed at a smaller power in a smaller human tissue (resistance value of 25 to 50 ohms).
Wherein, the range of the upper limit of disconnection is above 380-420 ohms.
I.e. in the self-start mode: the bipolar resistance is automatically output when the resistance is below 1000-1500 ohm. When the automatic output is performed, the power limiting output is started when the detection resistance is below about 25-50 ohms, and the output is cut off when the detection resistance is above about 400 ohms.
In the step-on mode: when the detection resistor is below 25-50 ohms, the power limiting output is started, and the output can be realized under the other resistance values. I do not step on the foot but do not output.
It can be detected that coagulation is not performed at the original power but performed at a smaller power in a smaller human tissue (resistance value of 25 to 50 ohms).
When the doctor coagulates blood with the bipole, the doctor can carry out fine coagulation without adjusting the current power, and the doctor is prevented from additionally damaging (scalding) the human body resistance value with a small resistance value. Prevent the doctor from causing unnecessary loss to the misoperation of small human tissues such as cranial nerves and the like. Under the self-starting mode and the pedal mode, the damage of arc discharge caused by the fact that a doctor mistakenly closes the two forceps tips is prevented.
In conclusion, the control method for the detection and protection of the high-frequency surgical equipment can ensure the safety of the negative plate and meet the requirement of timely blood coagulation, is suitable for a pedal mode and an automatic control mode during bipolar blood coagulation, can output low power to blood coagulation when short circuit occurs between two forceps tips or the two ends of the forceps detect low resistance, and can disconnect the output when the blood coagulation is completed in a self-starting mode.

Claims (10)

1. A control method for detection and protection of high-frequency surgical equipment is characterized by comprising the following steps:
step 1, acquiring a voltage signal Vout of current human tissue, a current signal Iout of current human tissue and a resistance signal dout of current starting resistance, and acquiring a pat voltage signal through an oscillation feedback circuit;
step 2, judging whether the output mode is a unipolar output mode or a bipolar output mode according to whether the dout signal is in a high level or whether the bipolar pedal outputs, and executing step 3 if the output mode is the unipolar output mode; if the bipolar output mode is selected, go to step 12;
step 3, judging whether unipolar power output exists or not according to the pat voltage signal, and if yes, executing step 4; if not, executing the step 9;
step 4, judging whether the voltage of the pat voltage signal is within an output threshold value, if so, executing step 5; if not, executing the step 8;
step 5, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, executing the step 7;
step 6, the panel displays the set power normally, does not give an alarm, and skips to the step 1 after outputting the power;
step 7, the panel displays the set power normally, gives an alarm, and skips to the step 1 after outputting the power;
step 8, displaying error codes on a panel, alarming, and skipping to the step 1 after power output is forbidden;
step 9, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 10; if not, executing the step 11;
step 10, the panel displays the set power normally, does not give an alarm, and jumps to step 1 after the power output is forbidden;
step 11, the panel displays the set power normally, gives an alarm, and jumps to step 1 after power output is forbidden;
step 12, calculating the size of a load resistor R;
step 13, setting a pedal mode or an automatic control mode, executing step 14 if the pedal mode or the automatic control mode is set, and executing step 20 if the pedal mode is set;
step 14, judging whether the operation is the first operation, if so, executing step 15, otherwise, executing step 19;
step 15, judging whether the resistance signal dout reaches an output threshold value, if so, executing step 16, otherwise, executing step 21;
step 16, judging whether the load resistance R is smaller than a normal threshold value, if so, executing step 17, otherwise, executing step 18;
step 17, after low power output, skipping to step 1;
step 18, after normal power output is carried out, skipping to step 1;
step 19, judging whether the load resistor R reaches the disconnection upper limit, if so, executing step 21, otherwise, jumping to step 16;
step 20, judging whether the bipolar pedals are output or not, if so, jumping to step 16, and if not, executing step 21;
and step 21, after the power output is forbidden, jumping to the step 1.
2. The control method for detection and protection of high-frequency surgical equipment according to claim 1, wherein the step 5 specifically comprises the following steps:
step 501, detecting whether short-circuit protection, temporary load rate alarm and leakage current overproof faults affecting unipolar power output exist, and if yes, executing step 7; if not, go to step 502;
step 502, judging whether the voltage of the pat voltage signal is within the complete fit threshold value, if so, executing step 6; if not, go to step 7.
3. A control method for detection protection of an hf surgical device according to claim 1 or claim 2 wherein the oscillatory feedback circuit includes a three-point oscillatory circuit (1), an impedance sensor T704, a neutral electrode impedance detection circuit (2), a pat voltage signal generation circuit (3).
4. The control method for the detection and protection of the high-frequency surgical equipment according to claim 3, wherein the three-point oscillating circuit (1) comprises a triode Q703, the base of the triode Q703 is connected with one end of a resistor R723, the collector of the triode Q703 is connected with one end of a capacitor C715 and the input end 5 of an impedance sensor T704, one end of an emitter of the capacitor R724 is connected with the other end of the capacitor C715, the other end of the capacitor C715 is further connected with an excitation voltage VDD and the input end 6 of the impedance sensor T704, the excitation voltage VDD is further connected with one end of a resistor R719, the other end of the resistor R724 is connected with the anode of a voltage stabilizing diode D717, the cathode of the voltage stabilizing diode D717 is connected with the other end of the resistor R723 and the other end of the resistor.
5. The control method for detection and protection of high frequency surgical equipment according to claim 4, wherein the neutral electrode impedance detection circuit (2) comprises a capacitor C713, one end of the capacitor C713 is connected with the input end 4 of the impedance sensor T704 and one end of a resistor R718, the other end of the capacitor C713 is connected with one end of a capacitor C718, the other end of a resistor R718 and one end of a resistor R722, the other end of the capacitor C713 is further connected with an output port, the other end of the capacitor C718 is connected with the input end 3 of the impedance sensor T704 and the other end of the resistor R722, and the other end of the resistor R722 and one end of the resistor R718 are connected with the.
6. The control method for detection and protection of high-frequency surgical equipment according to claim 5, wherein the pat voltage signal generating circuit (3) comprises a capacitance-variable diode D716, the anode of the capacitance-variable diode D716 is connected with the output end 2 of the impedance sensor T704, the cathode of the capacitance-variable diode D716 is connected with one end of a capacitor C719 and one end of an inductor L706, the other end of the inductor L706 is connected with one end of a capacitor C720 and one end of a resistor R725, the other end of the resistor R725 is connected with the other end of the capacitor C720, the other end of the capacitor C719 and the output end 1 of the impedance sensor T704, the output end 1 of the impedance sensor T704 is also connected with the other end of a resistor R724, the other end of the resistor R725.
7. The control method for detection and protection of high-frequency surgical equipment according to claim 3, wherein the output threshold value is in the range of 0-1V, and the full-fit threshold value is in the range of 0-0.5V.
8. A control method for bipolar electrocoagulation output protection according to claim 1, wherein the resistance signal dout of the current starting resistor is collected by a first signal module, and the first signal circuit comprises a colpitts oscillation circuit (4), a first transformer T001, and a first rectifying and filtering circuit (5).
9. A method of controlling bipolar coagulation output protection according to claim 1 or 8, wherein the present human tissue voltage signal Vout and the present human tissue current signal Iout are collected by a second signal module, the second signal module comprising a second isolation transformer T002 and a second rectifying and filtering circuit (6) connected in parallel across the output port, and further comprising a third isolation transformer T003 and a third rectifying and filtering circuit (7) connected in series across the output port.
10. A method of controlling bipolar electrocoagulation output protection according to claim 9, wherein the load resistance R is calculated by the following equation (1):
Figure FDA0002939814030000031
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