CN213283321U - Control circuit for automatic fine electrocoagulation of high-frequency electrotome - Google Patents
Control circuit for automatic fine electrocoagulation of high-frequency electrotome Download PDFInfo
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- CN213283321U CN213283321U CN202022008618.6U CN202022008618U CN213283321U CN 213283321 U CN213283321 U CN 213283321U CN 202022008618 U CN202022008618 U CN 202022008618U CN 213283321 U CN213283321 U CN 213283321U
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Abstract
A control circuit for automatic fine electrocoagulation of a high-frequency electrotome comprises a multiplier U1, a multiplier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, an analog switch U6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer W1 and a potentiometer W2. The utility model continuously samples the output voltage and current of the power amplifier, calculates the load resistance, and compares the load resistance with the threshold resistance; if the load resistance RL exceeds the threshold resistance R0, the coagulation is finished, the control circuit reduces the output voltage of the switching power supply, so that the output energy of the power amplifier is reduced, only small energy is reserved for continuously detecting the change of the load resistance, the adhesion of tissues and electrodes after the coagulation is finished is prevented, an audio switching signal is generated, continuous sound during starting is changed into intermittent sound, and a doctor is reminded of finishing the coagulation.
Description
Technical Field
The utility model relates to an electronic medical equipment, concretely relates to a control circuit that is used for automatic meticulous electricity of high frequency electrotome to congeal belongs to high frequency electrotome technical field.
Background
The high-frequency electric knife generally has a blood coagulation function, but the common blood coagulation is a working mode that the voltage and the power naturally drop when the load resistance is high, a certain power can be continuously output when the blood coagulation is finished, however, if the power output is not stopped in time, the electrode can be adhered to the tissue, and when the electrode is lifted away from the tissue, the bleeding point can be pulled away, and the blood can not be stopped as if the blood is stopped. At present, the means for preventing adhesion mainly depends on the independent judgment and operation methods of doctors, or a relatively expensive anti-adhesion dripping electrode is adopted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a control circuit for automatic meticulous electricity of high frequency electrotome congeals, through the change automatic adjustment output voltage who detects load resistance to control output, when load resistance surpassed threshold resistance, except that small detection power hardly exports operating current and power, with this possibility that reduces electrode adhesion tissue, send the suggestion sound that the blood coagulation ended simultaneously.
Based on the above-mentioned purpose, the utility model discloses the technical scheme who takes as follows:
a control circuit for automatic fine electrocoagulation of a high-frequency electrotome comprises a multiplier U1, a multiplier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, an analog switch U6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer W1 and a potentiometer W2;
the forward input end of the operational amplifier U3 is connected with a current sampling signal ISEN, the reverse input end is connected with the W pin of the multiplier U1, and the output end is connected with the X pin of the multiplier U1, the X pin of the multiplier U2 and the reverse input end of the operational amplifier U4;
the Y pin of the multiplier U1 is connected with a voltage sampling signal VSEN, the Z pin is connected with a ground GND, the forward input end of the operational amplifier U4 is connected with the middle pin of the potentiometer W1, the two ends of the potentiometer W1 are respectively connected with a power supply VCC and the ground GND, the Y pin of the multiplier U2 is connected with a voltage control signal ER2 and the 11 pin of the analog switch U6, one end of the resistor R3 is connected with the W pin of the multiplier U2 and the 8 pin of the analog switch U6, the other end of the resistor R3 is connected with the Z pin of the multiplier U2 and the middle pin of the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected with the power supply VCC and the ground GND;
a pin 1 of the analog switch U6 is connected to an output terminal of the operational amplifier U4, a pin 13 is connected to a selection signal QBP of the control circuit, a pin 2 is connected to pins 5 and 6 of the analog switch U6, and is simultaneously connected to a forward input terminal of the operational amplifier U5 and one end of the resistor R1, the resistor R1 is a pull-down resistor, the other end of the resistor R1 is grounded GND, a pin 4 of the analog switch U6 is grounded GND, a pin 10 is connected to a pin 9 of the analog switch U6 and a voltage control signal ER2', the resistor R2 is a pull-up resistor, one end of the resistor R is connected to a power supply VCC, and the other end of the resistor R2 is connected to pins 3 and 12 of the analog switch U6;
the inverting input end of the operational amplifier U5 is connected with a reference voltage VREF, the output end is connected with an audio switching signal GBP and one end of the resistor R4, and the other end of the resistor R4 is connected with GND.
Further, the signal GL input to the inverting input terminal of the operational amplifier U4 is 10 × ISEN ÷ VSEN, and is proportional to the reciprocal of the load resistance RL, i.e., the larger the load resistance RL, the smaller the signal GL; the signal G0 input to the positive input end of the operational amplifier U4 is in direct proportion to the reciprocal of the threshold resistor R0, i.e., the larger the threshold resistor R0, the smaller the signal G0; the signal GL is less than the signal G0 when the load resistance RL is greater than the threshold resistance R0.
Furthermore, a signal SER ═ ER2 × ISEN ÷ VSEN +. Δ Z at one end of the resistor R3 is a signal at the other end of the resistor R3, and is adjustable by the potentiometer W2.
Further, when the selection signal QBP is low, the pins 1 and 2 of the analog switch U6 are disconnected, the signals of the pins 5 and 6 are both low, accordingly, the pins 8 and 9 are disconnected, the pins 4 and 3 are disconnected, the signal of the pin 12 is high, accordingly, the pins 11 and 10 are connected, and the voltage control signal ER2' is ER 2;
when the selection signal QBP is high and the load resistance RL is greater than the threshold resistance R0, i.e., the signal GL < G0, pins 1 and 2 of the analog switch U6 are turned on and the signal of pin 2 is high. The 5-pin and 6-pin signals are both high, accordingly, the 4-pin and 3-pin are on, the 3-pin and 12-pin signals are low, the 11-pin and 10-pin are off, and accordingly, the 8-pin and 9-pin are on, and the voltage control signal ER2 'is the signal SER, that is, ER2' ER2 × ISEN ÷ VSEN +. Δ Z.
Further, the reference voltage VREF is 1/2 power VCC;
when the load resistor RL is less than the threshold resistor R0 or the selection signal QBP is low, the signal of pin 2 of the analog switch U6 is low, that is, the level of the positive input terminal of the operational amplifier U5 is less than the reference voltage VREF, then the signal of the output terminal of the operational amplifier U5 is low, that is, the audio switching signal GBP is low, and the start sound is kept unchanged continuously;
when the load resistor RL is greater than the threshold resistor R0 and the selection signal QBP is high, the signal of the pin 2 of the analog switch U6 is high, that is, the level of the positive input terminal of the operational amplifier U5 is greater than the reference voltage VREF, then the signal of the output terminal of the operational amplifier U5 is high, that is, the audio switching signal GBP is high, the continuous sound is changed to the intermittent sound, and the completion of the blood coagulation work is reminded.
Further, the control circuit controls the output voltage by continuously detecting the load resistance RL and comparing the load resistance RL with the threshold resistance R0, so that only small energy is output after coagulation is completed, adhesion of tissues and electrodes is reduced, and continuous sound during starting is changed into intermittent sound to remind that coagulation work is completed.
Further, after the automatic coagulation is started, if the electrode of the high-frequency electrotome is in an open circuit state, the control circuit directly gives off intermittent sound to prompt that the state of coagulation is finished; when the electrode contacts the tissue needing blood coagulation, the control circuit automatically outputs set power until the state of blood coagulation ending is reached again.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. automatically judging whether blood coagulation is finished or not according to the change of the load resistance;
2. after the coagulation is finished, only a tiny detection power is output, and the electrode can be prevented from adhering to tissues;
3. reminding a doctor of ending the blood coagulation by changing the continuous sound during starting into the discontinuous sound;
4. the detection and control part is a hardware circuit, and has high response speed and high reliability.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a diagram illustrating the relationship between the control voltage and the load resistance.
Fig. 3 is an operation schematic diagram of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and is not intended to limit the scope of the invention as claimed.
Referring to fig. 1, the control circuit for automatic fine electrocoagulation of the high-frequency electrotome comprises a multiplier U1, a multiplier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, an analog switch U6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer W1 and a potentiometer W2.
The forward input end of the operational amplifier U3 is connected with the current sampling signal ISEN, the reverse input end is connected with the W pin of the multiplier U1, and the output end is connected with the X pin of the multiplier U1, the X pin of the multiplier U2 and the reverse input end of the operational amplifier U4.
The Y pin of the multiplier U1 is connected with a voltage sampling signal VSEN, the Z pin is connected with a ground GND, the forward input end of the operational amplifier U4 is connected with the middle pin of the potentiometer W1, the two ends of the potentiometer W1 are respectively connected with a power supply VCC and the ground GND, the Y pin of the multiplier U2 is connected with a voltage control signal ER2 and the 11 pin of the analog switch U6, one end of the resistor R3 is connected with the W pin of the multiplier U2 and the 8 pin of the analog switch U6, the other end of the resistor R3 is connected with the Z pin of the multiplier U2 and the middle pin of the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected with the power supply VCC and the ground GND.
The 1 pin of the analog switch U6 is connected with the output end of the operational amplifier U4, the 13 pin is connected with the selection signal QBP of the control circuit, the 2 pin is connected with the 5 pin and the 6 pin of the analog switch U6, and simultaneously connected with the forward input end of the operational amplifier U5 and one end of the resistor R1, the resistor R1 is a pull-down resistor, the other end of the resistor R1 is grounded GND, the 4 pin of the analog switch U6 is grounded GND, the 10 pin is connected with the 9 pin of the analog switch U6 and the voltage control signal ER2', the resistor R2 is a pull-up resistor, one end of the resistor R is connected with a power supply VCC, and the other end of the resistor R6 is connected with the 3 pin and the 12 pin.
The inverting input end of the operational amplifier U5 is connected with a reference voltage VREF, the output end is connected with an audio switching signal GBP and one end of the resistor R4, and the other end of the resistor R4 is connected with GND.
According to the fixed characteristic of the multiplier U1: w X Y/10 + Z, which yields the signal GL in fig. 1 10 × ISEN/VSEN, which is proportional to the inverse of the load resistance RL, i.e. the larger the load resistance RL, the smaller the signal GL. The signal G0 in fig. 1 is proportional to the reciprocal of the threshold resistance R0, i.e. the larger the threshold resistance R0, the smaller the signal G0. Therefore, when the load resistance RL is greater than the threshold resistance R0, i.e., the signal GL is less than the signal G0.
According to the fixed characteristic of the multiplier U2: w ═ X × Y ÷ 10+ Z, the signal SER ═ ER2 × ISEN ÷ VSEN +. Δ Z in the diagram is obtained, wherein the signal Δ Z can be adjusted according to the potentiometer W2.
In fig. 1, QBP is a selection signal of the control circuit, and when QBP is low, pins 1 and 2 of the analog switch U6 are turned off. The resistor R1 is a pull-down resistor, so pins 5 and 6 of the analog switch U6 are both low, pins 8 and 9 are off, and pins 4 and 3 are off. The resistor R2 is a pull-up resistor, so pin 12 of the analog switch U6 is high, corresponding pins 11 and 10 are turned on, and the voltage control signal ER2' is ER 2. When the QBP signal is high and the RL is greater than the R0 threshold, i.e., GL < G0, pins 1 and 2 of the switch U6 are on and pin 2 is high. Pins 5 and 6 of the analog switch U6 are both high, corresponding pins 4 and 3 are on, since pin 4 is grounded, pin 3 and pin 12 are low, and pin 11 and pin 10 of the analog switch U6 are off. Similarly, since the 6 pins of the analog switch U6 are high and the corresponding 8 pins and 9 pins are on, the voltage control signal ER2 ═ SER, that is, ER2 ═ ER2 × ISEN ÷ VSEN +. Δ Z.
In the figure, signal VREF is a reference voltage, and VREF is 1/2 VCC. If the load resistance is smaller than the threshold resistance R0 or the selection signal QBP is low, the pin 2 of the analog switch U6 is a low signal, that is, the positive input terminal of the operational amplifier U5 is smaller than the reference voltage VREF, at this time, the output terminal of the operational amplifier U5 is a low signal, that is, the audio switching signal GBP is low, and the start sound is kept unchanged. If the load resistance RL is greater than the threshold resistance R0 and the selection signal QBP is high, the pin 2 of the analog switch U6 is a high signal, that is, the positive input terminal of the operational amplifier U5 is greater than the reference voltage VREF, and at this time, the output terminal of the operational amplifier U5 is a high signal, that is, the audio switching signal GBP is high, so that the continuous sound during starting is changed into an intermittent sound, and a doctor is reminded of completing the blood coagulation work.
Referring to fig. 2, the control voltage ER is used for adjusting the output voltage of the switching power supply, and further for adjusting the output power of the power amplifier. ER2 is the original switching power supply voltage control signal that has not been adjusted by the control circuit. In the figure, ER2' is a voltage control signal adjusted by the control circuit, and ER1< ER 2. In the figure, RL is a sampled value of the load resistor derived from the voltage sampling signal VSEN and the current sampling signal ISEN. In the figure, R0 is a threshold resistor for determining whether coagulation is completed, and the threshold resistor R0 is adjusted by applying a resistor of a fixed resistance value and adjusting a potentiometer W1. When the load resistance RL is detected to be larger than the threshold resistance R0, which indicates that the coagulation is finished, the control voltage signal is changed from ER2 to ER2', and the output voltage of the switching power supply is reduced, so that the power amplifier only outputs a small detection energy, and the tissue and the electrode are prevented from being adhered after the coagulation is finished.
Referring to fig. 3, the control circuit for automatic fine electrocoagulation of a high-frequency electrotome of the present invention continuously samples the output voltage and current of the power amplifier, calculates the load resistance and compares the load resistance with the threshold resistance; if the load resistance exceeds the threshold resistance, the coagulation is finished, the control circuit reduces the output voltage of the switching power supply, so that the output energy of the power amplifier is reduced, only very small energy is reserved for continuously detecting the change of the load resistance, the adhesion of tissues and electrodes is reduced, an audio switching signal is generated at the same time, continuous sound during starting is changed into intermittent sound, and a doctor is reminded of finishing the coagulation work.
The claimed protection scope of the present invention is not limited to the above embodiments, and should include other obvious changes and alternatives, all equivalent changes and modifications made according to the contents of the present invention, all belonging to the scope of the present invention.
Claims (7)
1. A control circuit for automatic fine electrocoagulation of a high-frequency electrotome, characterized in that: the control circuit comprises a multiplier U1, a multiplier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, an analog switch U6, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer W1 and a potentiometer W2;
the forward input end of the operational amplifier U3 is connected with a current sampling signal ISEN, the reverse input end is connected with the W pin of the multiplier U1, and the output end is connected with the X pin of the multiplier U1, the X pin of the multiplier U2 and the reverse input end of the operational amplifier U4;
the Y pin of the multiplier U1 is connected with a voltage sampling signal VSEN, the Z pin is connected with a ground GND, the forward input end of the operational amplifier U4 is connected with the middle pin of the potentiometer W1, the two ends of the potentiometer W1 are respectively connected with a power supply VCC and the ground GND, the Y pin of the multiplier U2 is connected with a voltage control signal ER2 and the 11 pin of the analog switch U6, one end of the resistor R3 is connected with the W pin of the multiplier U2 and the 8 pin of the analog switch U6, the other end of the resistor R3 is connected with the Z pin of the multiplier U2 and the middle pin of the potentiometer W2, and the two ends of the potentiometer W2 are respectively connected with the power supply VCC and the ground GND;
a pin 1 of the analog switch U6 is connected to an output terminal of the operational amplifier U4, a pin 13 is connected to a selection signal QBP of the control circuit, a pin 2 is connected to pins 5 and 6 of the analog switch U6, and is simultaneously connected to a forward input terminal of the operational amplifier U5 and one end of the resistor R1, the resistor R1 is a pull-down resistor, the other end of the resistor R1 is grounded GND, a pin 4 of the analog switch U6 is grounded GND, a pin 10 is connected to a pin 9 of the analog switch U6 and a voltage control signal ER2', the resistor R2 is a pull-up resistor, one end of the resistor R is connected to a power supply VCC, and the other end of the resistor R2 is connected to pins 3 and 12 of the analog switch U6;
the inverting input end of the operational amplifier U5 is connected with a reference voltage VREF, the output end is connected with an audio switching signal GBP and one end of the resistor R4, and the other end of the resistor R4 is connected with GND.
2. The control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 1, characterized in that: a signal GL which is input to the inverting input terminal of the operational amplifier U4 and is in direct proportion to the reciprocal of the load resistance RL is 10 × ISEN ÷ VSEN, i.e., the larger the load resistance RL is, the smaller the signal GL is; the signal G0 input to the positive input end of the operational amplifier U4 is in direct proportion to the reciprocal of the threshold resistor R0, i.e., the larger the threshold resistor R0, the smaller the signal G0; the signal GL is less than the signal G0 when the load resistance RL is greater than the threshold resistance R0.
3. Control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 2, characterized in that: the signal SER ═ ER2 × ISEN ÷ VSEN +. Δ Z at one end of the resistor R3 is a signal at the other end of the resistor R3, and can be adjusted by the potentiometer W2.
4. A control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 3, characterized in that: when the selection signal QBP is low, pins 1 and 2 of the analog switch U6 are off, the signals of pins 5 and 6 are both low, accordingly, pins 8 and 9 are off, pins 4 and 3 are off, the signal of pin 12 is high, accordingly, pins 11 and 10 are on, and the voltage control signal ER2 ═ ER 2;
when the selection signal QBP is high and the load resistance RL is greater than the threshold resistance R0, i.e. the signal GL < G0, pin 1 and pin 2 of the analog switch U6 are on and the signal for pin 2 is high, the signals for pin 5 and pin 6 are both high, accordingly pin 4 and pin 3 are on, the signals for pin 3 and pin 12 are low, pin 11 and pin 10 are off, respectively pin 8 and pin 9 are on, the voltage control signal ER2'═ signal SER, i.e. ER2' ═ ER2 × ISEN ÷ VSEN +. Δ Z.
5. Control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 2, characterized in that: the reference voltage VREF is 1/2 power VCC;
when the load resistor RL is less than the threshold resistor R0 or the selection signal QBP is low, the signal of pin 2 of the analog switch U6 is low, that is, the level of the positive input terminal of the operational amplifier U5 is less than the reference voltage VREF, then the signal of the output terminal of the operational amplifier U5 is low, that is, the audio switching signal GBP is low, and the start sound is kept unchanged continuously;
when the load resistor RL is greater than the threshold resistor R0 and the selection signal QBP is high, the signal of the pin 2 of the analog switch U6 is high, that is, the level of the positive input terminal of the operational amplifier U5 is greater than the reference voltage VREF, then the signal of the output terminal of the operational amplifier U5 is high, that is, the audio switching signal GBP is high, the continuous sound is changed to the intermittent sound, and the completion of the blood coagulation work is reminded.
6. Control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 2, characterized in that: the control circuit controls the output voltage by continuously detecting the load resistance RL and comparing the load resistance RL with the threshold resistance R0, so that only small energy is output after coagulation is completed, adhesion between tissues and electrodes is reduced, and continuous sound during starting is changed into intermittent sound to remind that coagulation work is completed.
7. Control circuit for automatic fine electrocoagulation of high-frequency electrotomes according to claim 6, characterized in that: after the automatic coagulation is started, if the electrode of the high-frequency electrotome is in an open-circuit state, the control circuit directly gives off intermittent sound to prompt that the coagulation is finished; when the electrode contacts the tissue needing blood coagulation, the control circuit automatically outputs set power until the state of blood coagulation ending is reached again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022008618.6U CN213283321U (en) | 2020-09-15 | 2020-09-15 | Control circuit for automatic fine electrocoagulation of high-frequency electrotome |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022008618.6U CN213283321U (en) | 2020-09-15 | 2020-09-15 | Control circuit for automatic fine electrocoagulation of high-frequency electrotome |
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| CN213283321U true CN213283321U (en) | 2021-05-28 |
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| CN202022008618.6U Active CN213283321U (en) | 2020-09-15 | 2020-09-15 | Control circuit for automatic fine electrocoagulation of high-frequency electrotome |
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