CN215349419U

CN215349419U - LC resonance circuit for high-frequency electrotome

Info

Publication number: CN215349419U
Application number: CN202121762000.7U
Authority: CN
Inventors: 张豪; 王世兵; 李高亚; 孙良俊
Original assignee: Nanjing Eco Microwave System Co ltd
Current assignee: Nanjing Yigao Medical Technology Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-31
Anticipated expiration: 2031-07-30

Abstract

The utility model provides an LC resonance circuit for a high-frequency electrotome, which comprises an optical coupling isolator for electric isolation, a switch circuit unit which is connected with the optical coupling isolator and controls an electric cutting mode and an electric coagulation mode, a transformer connected with the switch circuit unit, a symmetrical LC resonance circuit connected with the transformer, a voltage sampling unit connected with the symmetrical LC resonance circuit, a leakage current sampler and a current sampler. The circuit adopts a group of LC resonance circuits on the primary side of the transformer, is controlled by a relay and is used for the high-frequency electrotome to be used in an electrocoagulation channel, and two groups of LC resonance circuits which are mutually symmetrical are designed on the secondary side of the transformer and are used for the high-frequency electrotome to be used in an electrotomy channel. The utility model can make the high-frequency electrotome output the required voltage and current under different modes of electrotomy electrocoagulation, has simple circuit design structure and improves the circuit efficiency.

Description

LC resonance circuit for high-frequency electrotome

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an LC resonance circuit for a high-frequency electrotome.

Background

In traditional surgical operations, scalpels and hemostats are the most common medical devices used in clinical operations. With the continuous progress of medical technology level and the continuous improvement of the requirements on operation safety and postoperative rehabilitation, the high-frequency electrotome has gradually replaced the traditional medical instruments such as a scalpel, a hemostatic forceps and the like, and becomes an essential medical device in the operation process of large and medium hospitals. The high-frequency electric knife heats the tissue through the heat generated when the high-frequency (usually 200kHz to 3 MHz) high-voltage current generated by the tip of the effective electrode contacts the tissue, so as to realize the separation and coagulation of the tissue of the body, thereby achieving the purposes of cutting and hemostasis. This technique has been in the last hundred years since the first high frequency electric knife invented by doctor William Bovie, Harvey university, 1927, and first used in clinical surgery by doctor Harvey Cushing. Compared with the traditional scalpel, the high-frequency electric scalpel has the following advantages: when the high-frequency electrotome is used for operating a patient, the wound surface of the patient has less bleeding, the visual influence on medical staff is reduced, and the accuracy and the rapidness of the operation are facilitated; the high-frequency electrotome has good coagulation effect, simple operation, safety and convenience, and can greatly shorten the operation time and reduce the blood loss and blood transfusion volume of patients by clinically adopting the high-frequency electrotome, thereby reducing complications and operation cost and greatly improving the operation efficiency and operation success coefficient.

The heat generated by the high-frequency electric knife in the operation process can cause the tissue to heat to 100 ℃ and 200 ℃ so as to cause the tissue cells to denature, necrotize, dry shrink, vaporize, carbonize and form eschar, thereby achieving the purpose of stopping bleeding or cutting the tissue. However, the high frequency electric knife has a large current and a relatively low voltage when achieving electric cutting, and a small current and a relatively large voltage when achieving blood coagulation, which poses a great challenge to the design of a circuit. Therefore, the electrical parameter design is the key design of the high-frequency electrotome for the cutting and coagulation effect of the tissue, the biological tissue is used as the load of the high-frequency electrotome power supply, the tissue characteristics of the biological tissue are shown under different electrical parameters, and the different electrical parameters have good effects on the cutting and coagulation process of the high-frequency electrotome, which is the key of the design and improvement of the high-frequency electrotome power supply control system in the design and development process. In the past, the voltage output is not increased, the coagulation effect is not good, and the leakage current is large, so that the human body is easily damaged.

Disclosure of Invention

The utility model aims to provide an LC resonance circuit for a high-frequency electrotome, which can enable the high-frequency electrotome to output required voltage and current in different modes of electrotomy electrocoagulation, has a simple circuit design structure and improves the circuit efficiency.

In order to achieve the above object, according to the technical scheme provided by the present invention, the LC resonant circuit for a high frequency electrotome comprises an optical coupling isolator for electrical isolation, a switch circuit unit connected with the optical coupling isolator and controlling an electrotomy and electrocoagulation mode, a transformer connected with the switch circuit unit, a symmetrical LC resonant circuit connected with the transformer, a voltage sampling unit connected with the symmetrical LC resonant circuit, a leakage current sampler, and a current sampler.

One end of the optocoupler isolator QPT1 is connected with a control signal, and the other end of the optocoupler isolator QPT1 is connected with the switch circuit unit.

The switch circuit unit comprises a MOS transistor Q5, single-pole double-throw relays SW1 and SW2, diodes D25 and D26, and further comprises a group of LC resonance circuits consisting of an inductor L3 and a capacitor C10.

The transformer is a step-up transformer, and the step-up coefficient is 1: 6.

One path of the symmetrical LC resonance circuit is symmetrically composed of an inductor L2, capacitors C2, C3 and C14 which are connected in series, and a first group of LC resonance circuits are formed by the inductor L2 and the capacitors C2, C3 and C14 and 3 single-pole single-throw relays K1A, K2A and K3A; the other one of the two circuits is composed of an inductor L1, capacitors C4, C5 and C16 which are connected in series, and a second group of LC resonance circuits which are formed by the three circuits and 3 single-pole single-throw relays K4A, K5A and K6A, wherein the first group of LC resonance circuits and the second group of LC resonance circuits are in a symmetrical mode.

Furthermore, the inductance of the inductor L2 is equal to that of the inductor L1, and the capacitances of the capacitors C2, C3, and C14 are respectively the same as the capacitances of the capacitors C4, C5, and C16.

Optionally, the voltage sampling unit is formed by serially connecting resistors R29, R30 and R36, a capacitor C23 and a voltage transformer T3.

Optionally, the leakage current sampler is a current transformer T1, and the current transformer T1 is connected in series with the first group of LC resonant circuits and the second group of LC resonant circuits respectively.

Optionally, the current sampler is a current transformer T6, and the current transformer T6 is connected in series with the second group of LC resonant circuits respectively.

Compared with the prior art, the utility model has the following beneficial effects:

1. the circuit of the utility model adopts a group of LC resonance circuits on the primary side of the step-up transformer T4, is controlled by a relay, is used for the high-frequency electrotome to be used in an electrocoagulation channel, solves the problem that the modulating wave voltage of the high-frequency electrotome is insufficient during electrocoagulation, and effectively meets the requirements of high voltage and low current of the high-frequency electrotome during coagulation.

2. The secondary side of the step-up transformer T4 is designed into two groups of LC resonance circuits which are mutually symmetrical, and the two groups of LC resonance circuits are used for a high-frequency electrotome to be used in an electrotomy channel, so that the problem of large output leakage current is solved while the voltage and the current required by electrotomy are met.

3. The circuit of the utility model designs voltage, current and leakage current sampling, monitors, regulates and controls the output voltage, current and leakage current, prevents the output voltage, current and leakage current from being too low or too high, and prevents the circuit from outputting overvoltage or overcurrent to cause damage to human bodies.

Drawings

Fig. 1 is a circuit diagram of an LC resonant circuit provided in this embodiment.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the present embodiment provides a circuit diagram of an LC resonant circuit. The utility model provides an LC resonance circuit for a high-frequency electrotome, which comprises an optical coupling isolator 1, a switch circuit unit 2, a transformer 3, a symmetrical LC resonance circuit 4, a voltage sampling unit 7, a leakage current sampler 5 and a current sampler 6.

The optical coupler isolator 1 is used for electrically isolating the control signal circuit from the switch circuit unit. When the control signal of the pin 2 of the optical coupler isolator 1 is at a high level, the MOS tube Q5 does not work, the relays K14 and K13 do not work, the pin 1 pin 2 of the relays K14 and K13 are attracted, at the moment, an electrical switching signal is input from FB-A, voltage boosting is carried out for the first time through the transformer T4, and the relays K1A and K6A are disconnected.

When the pure cutting signal with lower frequency passes, the relays K2A and K4A are attracted, and the relays K3A and K5A are disconnected. One path of the pure-cutting signal flows in through a pin 2 of an inductor L2, flows out through a pin 6, resonates through capacitors C2, C3 and C14, then carries out secondary voltage boosting, acts on a human load end to form a loop, and outputs current I1; the other path of the pure-cut signal flows in through a pin 2 of the inductor L1, flows out through a pin 6, resonates through the capacitors C4, C5 and C16, then carries out secondary boosting, acts on a human body load end to form a loop, and outputs a current I2. The difference between the current I1 and the current I2 forms the leakage current I12.

When a mixed-cut signal with higher frequency passes through, the relays K2A and K4A are switched off, the relays K3A and K5A are attracted, one path of a pure-cut signal flows in through the 2 pins and flows out through the 4 pins of the inductor L2, and then after resonance is carried out through harmonic devices of the capacitors C2, C3 and C14, secondary boosting is carried out, a loop is formed by acting on a human body load end, and a current I3 is output; the other path of the pure-cut signal flows in through a pin 2 of the inductor L1, flows out through a pin 4, resonates through the capacitors C4, C5 and C16, then carries out secondary boosting, acts on a human body load end to form a loop, and outputs a current I4. The difference between the current I3 and the current I4 forms the leakage current I34.

Inductance values of the inductor L2 and the inductor L1 are equal, capacitance values of the capacitors C2, C3 and C14 and capacitance values of the capacitors C4, C5 and C16 are respectively and correspondingly equal, and thus two-path symmetrical design is formed.

In conclusion, the input electrotomy signal is a continuous square wave signal, the secondary side of the step-up transformer resonates through two LC circuits to form a continuous sine wave, and then the continuous sine wave is symmetrically output, so that the voltage and the current values required under the electrotomy mode are output, the output leakage current particularly meets the requirements of medical instrument regulations and standards, and meanwhile, the design of the electrical parameters of the high-frequency electrotomy meets the clinical requirements.

According to an embodiment of the utility model, when a control signal of a pin 2 of the optical coupler isolator 1 is at a low level, an MOS tube Q5 is conducted, relays K14 and K13 work, a pin 1 and a pin 3 of the relays K14 and K13 are attracted, at the moment, an electrocoagulation signal is input from FB-A, resonates into a sine wave signal through an inductor L3 and a capacitor C1, and then is boosted again through a transformer, the relays K1A and K6A are attracted, one path of the signals is output through a capacitor C14, and the signals act on a human body load end to form a loop and output a current I5; the other path is output through C16 and acts on a human body load end to form a loop, and a current I6, a difference value of the current I5 and the current I6 are output to form a leakage current I56.

That is, after LC resonance is carried out on the modulated electrocoagulation signal on the primary side of the transformer, the voltage is amplified, and then the modulated electrocoagulation signal passes through the step-up transformer, the output voltage can meet the voltage required by the electrocoagulation mode, so that the problem that the voltage of the electrocoagulation mode cannot be increased in the prior art is solved.

The two output circuits carry out proportional sampling on leakage currents I12, I34 and I56 through a leakage current sampler 5, the leakage current value is controlled within a certain range, and when the leakage current value exceeds the control range and is easy to cause damage to a human body, the circuits can start protective measures.

The voltage sampling unit 7 is connected in parallel to the two output circuits, carries out proportional sampling on the output voltage, controls the output voltage value, and starts overvoltage protection when the voltage is higher than the control range, so as to prevent the human body from being injured by overhigh voltage.

The current sampler 6 is connected in series with one output circuit to perform proportional sampling on the output circuit, control the output current value and perform overcurrent protection on the circuit.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The protection scope of the patent of the utility model is subject to the appended claims.

Claims

1. An LC resonant circuit for a high frequency electrotome, characterized by: the electric coagulation system comprises an optical coupler isolator for electric isolation, a switch circuit unit which is connected with the optical coupler isolator and used for controlling an electric cutting mode and an electric coagulation mode, a transformer connected with the switch circuit unit, a symmetrical LC resonance circuit connected with the transformer, a voltage sampling unit connected with the symmetrical LC resonance circuit, a leakage current sampler and a current sampler.

2. The LC resonant circuit for a high-frequency electric knife according to claim 1, characterized in that: the transformer is a step-up transformer, and the step-up coefficient is 1: 6.

3. The LC resonant circuit for a high-frequency electric knife according to claim 1, characterized in that: the inductance of the inductor L2 is equal to that of the inductor L1, and the capacitances of the capacitors C2, C3 and C14 are respectively the same as the capacitances of the capacitors C4, C5 and C16.

4. The LC resonant circuit for a high-frequency electric knife according to claim 1, characterized in that: the voltage sampling unit is formed by serially connecting resistors R29, R30 and R36, a capacitor C23 and a voltage transformer T3.

5. The LC resonant circuit for a high-frequency electric knife according to claim 1, characterized in that: the leakage current sampler is a current transformer T1, and the current transformer T1 is respectively connected with the first group of LC resonance circuits and the second group of LC resonance circuits in series.

6. The LC resonant circuit for a high-frequency electric knife according to claim 1, characterized in that: the current sampler is a current transformer T6, and the current transformer T6 and the second group of LC resonant circuits are respectively connected in series.