JPH0410809Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an electrosurgical device for performing surgical operations using an electric scalpel.

B. Prior Art Surgery using an electric scalpel utilizes the phenomenon of applying a high frequency voltage between the needle end of the electric scalpel and the surgical patient to destroy and cut cells. In this type of electrosurgical device, as shown in FIG. 2, an electric scalpel 1 is connected to a high frequency oscillator 2 in a device box 6 via a lead wire 4. On the other hand, a return electrode plate 3 serving as a counter electrode of the electric knife 1 is attached to a part of the patient K and connected to a high frequency oscillator 2 via a lead wire 5. Reference numeral 10 denotes a switch for oscillating a command signal for turning on and off the high frequency oscillator 2 via a lead wire 11. 7 is a power supply connection system that supplies power to the device box 6; 13 is a power supply connection system that supplies power to the electric operating table 12.

In such a surgical device, when performing surgery, the needle end of the electric scalpel 1 is brought close to the affected area of the patient K, and the switch 10 is pressed to apply a high frequency voltage to the affected area of the patient between the tip and the return electrode plate 3. The human body is approximately
Although it has a resistance of 600 ohms, a high frequency current flows between the electric scalpel 1 and the return electrode plate 3 to perform the surgery. In this case, the return electrode 3 is attached to the human body over a certain wide area, so the current is not concentrated, but the current is concentrated at the tip of the electric scalpel 1, which destroys the cells of the human body on the tip side and cuts. It will be.

C. Problems to be solved by the invention With such an electrosurgical device, there have been cases where patient K has been burned during surgery. In other words, although the return electrode plate 3 is attached to the human body in a certain area, during the cutting or coagulation operation using an electric scalpel or as time passes, the contact with the human body becomes point contact (high resistance), and local heating phenomenon occurs. may occur and cause burns. For this purpose, a contrivance has been taken to disconnect the lead wire 5 from the return electrode plate 3 from the ground (earthed state) and to place it in a so-called floating state. Although this floating method is useful for relieving burn injuries, it carries the risk of cardiac arrest due to the microshock the patient receives during surgery. In other words, electrical equipment and ME equipment generally use EPR to prevent electrical shock.
(Equipotential Patient Reference) system is in place. This system connects equipment that can be touched directly by the patient or through the body (conductor) of a doctor or nurse to a single point called the EPR point via a conductor with very low resistance, creating a potential difference of 5 mV between this single point and the equipment. I will leave it as follows. FIG. 2 shows this EPR system, and the device box 6 and operating table 12 are grounded via lead wires 8 and 14, respectively.

However, the side of the return electrode plate 3 is grounded (earthed)
If, for example, the patient's hand touches a conductor on the operating table 12 while floating, high-frequency current will flow between the patient and the operating table 12, giving an electric shock to the heart or the like. This is because the return electrode 3 is floating and the electric scalpel system has a different potential from the ground (earth) potential. This is because current flows. Therefore, conventional electrosurgical devices have the problem of causing microshocks that are dangerous to the patient.

The present invention aims to provide an electrosurgical device that solves these problems.

D. Measures to solve the problem A detector that detects when the electric scalpel comes in contact with (proximity to) the patient's body, and the signal detected by this detector is used to ground the connecting lead wire between the return electrode and the high-frequency oscillator. A disconnector is provided to disconnect the system to (earth), and the connecting lead wire is floated during incision or coagulation using an electric scalpel so that it can be grounded at times other than when incision or coagulation is being performed.

E Effect During the incision or coagulation operation, the return electrode side is floating, so even if the contact state at the part where the return electrode is attached to the patient's body is a point contact, there is no local contact between it and other metal contact parts. Electricity will no longer flow. In addition, since the return electrode side is grounded when not performing incision or coagulation operations, an EPR system is formed and when the patient's hand touches the operating table, electricity will not flow through the patient's hand to the operating table side.

F. Embodiment The configuration of the present invention will be explained below based on the embodiment shown in FIG.

In FIG. 1, parts having the same functions as those in FIG. 2 are designated by the same reference numerals as in FIG. 2, and detailed explanation thereof will be omitted.

As is clear from the figure, in addition to the system consisting of the high-frequency oscillator 2, the electric scalpel 1, the return electrode plate 3, and their connecting leads 4 and 5, a parallel circuit for the high-frequency oscillator 2 is provided, and a resistance meter is connected to this parallel circuit. A detector 15 including a detector 15 is provided. This detector 15 detects whether the electric scalpel 1 is in contact with the patient's body, that is, an incision or coagulation operation is in progress.
A detection signal is output when the electric scalpel 1 is in contact with the patient's body. 16 is a relay switch interposed in the grounding system of the lead wire 5;
The system is normally connected, but when a detection signal is output from the detector 15, it operates to disconnect the ground system in response to it. That is, during the cutting or coagulation operation, the grounding system is disconnected and the return electrode plate 3 becomes floating.

Of course, after the incision or coagulation operation, the detector 15
detects this, the floating state is erased, and the system becomes grounded.

The invention also encompasses devices with other detectors instead of an ohmmeter. The circuit to be provided may also be other than the parallel circuit (bypass circuit) as shown in the illustrated example. For example, a modified embodiment can be mentioned in which a sensor is attached to the body of the electric scalpel to output an electric signal when the needle end comes into contact with the patient's body, and this signal is used to operate the cutting device. The relay switch may also be replaced with another cutter.

G Effect According to the present invention, the return electrode side is floated during the incision or coagulation operation, so no burns occur, and on the other hand, it is grounded except during the incision or coagulation operation, so there is no risk of cardiac shock. .
A device is thus obtained which ensures safe electrosurgery.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing an electrosurgical device according to the present invention, and FIG. 2 is a diagram similarly showing a conventional device. 1...Electric scalpel, 2...High frequency oscillator, 3...
Return electrode, 4, 5, 11...Lead wire, 6...Device box, 7, 13...Power connection system, 10...Switch, 12...Electric operating table, K...Patient.

Claims (1)

[Scope of utility model registration request] a high-frequency oscillator; an electric scalpel that operates on a patient by receiving high-frequency output from the oscillator; a return electrode plate that is connected to the high-frequency oscillator and is a counter electrode of the electric scalpel that is attached to the body of the surgical patient; It is equipped with a grounding system that grounds the plate side, and a switch attached to the electric scalpel for transmitting an operation on/off command signal for the high-frequency oscillator, and when the switch is operated, a high-frequency voltage is generated between the electric scalpel and the patient. The surgical device is configured to perform a surgery by applying electric current, and includes a detector for detecting that the electric scalpel comes into contact with a patient's body, and a grounding system for the return electrode that operates in response to a detection signal from the detector. An electrosurgical device comprising: a cutter that cuts the return electrode plate and floats the return electrode plate.