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High-frequency Electrosurgery Unit - The Basics

Views: 0     Author: Site Editor     Publish Time: 2023-04-03      Origin: Site


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What is High-Frequency Electrosurgery Unit?

The High-Frequency Electrosurgery Unit is an electrosurgical device that replaces the mechanical scalpel for tissue cutting, and is divided into monopolar electrodes and bipolar electrocoagulation. It controls the cutting depth and coagulation speed during surgery by computer to achieve the effect of cutting and hemostasis.
In layman's terms, it is a scalpel that uses electricity to achieve blood clotting while cutting.

The HF electrosurgery unit is composed of the main unit and accessories such as Electrosurgical Pencil, Bipolar electrocoagulation tweezers, Neutral electrode, Bipolat foot switch, etc.

1.Hand-controlled Electrosurgical Pencil output
2.Single bipolar mode can be converted and output by Bipolat foot switch
3.Neutral electrode is used to disperse high-frequency currents, avoiding high-frequency current burns and electrical burns for the safety of health care workers and patients.
4.The MeCan model MCS0431 electrosurgical unit is available as an accessory, and electrosurgical consumables such as the Standard electrosurgical pencil (Disposable) and Neutral electrode can be purchased separately.


Working Principle



Monopolar mode: Using the heat energy and discharge released by high-frequency current to cut and stop the bleeding of tissues. The electric current creates high temperature, heat energy and discharge at the tip of the Electrosurgical Pencil, causing rapid dehydration, decomposition, evaporation and blood coagulation of the tissues in contact to achieve the effect of tissue disintegration and coagulation. Bipolar mode: The bipolar forceps are in good contact with the tissue, the current passes between the two poles of the bipolar forceps and its deep coagulation spreads radially, the associated tissue turns into small light brown crusts without forming a visible arc. Good electrocoagulation results can be achieved in both dry or moist operative fields. Bipolar electrocoagulation is basically non-cutting, mainly coagulation, slower, but with reliable hemostasis and minimal impact on surrounding tissues.
The two forceps tips of bipolar form a double circuit, so the bipolar mode does not require Neutral electrode.

The frequency of electrosurgery units in general use today is about 300-750 KHz (kilohertz)
- There are two small buttons on the knife handle, one is CUT and the other is COAG. neutral electrode is a soft benign conductor plate in contact with the body, usually also disposable, attached to the patient's back or thigh and then connected to the main unit. When all connections are made and the Electrosurgical Pencil button is pressed, the current flows from the main unit, through the wire to the high frequency Electrosurgical Pencil, which enters the body through the tip, and then flows back to the main unit from the Neutral electrode attached to the patient to form a closed loop (as shown below).


The electrosurgery unit enables a significant reduction in operating time, reduced surgical difficulties, reduced blood loss in patients, reduced surgical complications and surgical costs. Fast cutting speed, good hemostasis, simple operation, safety and convenience. The bleeding volume of the same surgery is significantly reduced compared to the past.

Operation procedure
1. Connect the power cord and plug the Bipolat foot switch into the corresponding socket.
2. Connect the Neutral electrode lead and attach the Neutral electrode to the patient's muscle rich area.
3. Turn on the power switch and turn on the machine for self-test.
4. Connect the monopolar and bipolar leads, select the appropriate output power and output mode (Coag, Cut, Bipolar), and control the output using the hand switch or Bipolat foot switch (blue Coag, yellow Cut,).
5. After use, return the output power to "0", turn off the power switch and unplug the power cord. 
6. After the operation, use the register and clean and organize the electrosurgery unit equipment.



     Typical Power Setting Values

      Take MeCan model MCS0431 High-frequency Electrosurgery Unit as an example, after each power on, the HF electric knife will default to the recently used mode and power setting value. When using the HF electric knife for cutting, if you do not know the correct power setting value, you should set the knife to a very low setting value, and then carefully increase its power until you can achieve the desired effect.

1、Low power:

Cutting, coagulation <30 watts

- Dermatological surgery

- Laparoscopic sterilization surgery (bipolar and monopolar)

- Neurosurgery (bipolar and monopolar)

- Oral surgery

- Plastic surgery

- Polypectomy surgery

- Vasectomy surgery

2、Medium power:

Cutting: 30-60 watts Coagulation 30-70 watts

- General surgery

- Head and neck surgery (ENT)

- Caesarean section surgery

- Orthopaedic surgery (major surgery)

- Thoracic Surgery (Routine Surgery)

- Vascular surgery (major surgery)

3、High power:

Cutting > 60 watts Coagulation > 70 watts

- Cancer ablation surgery, mastectomy, etc. (cutting: 60-120 watts; coagulation: 70-120 watts)

- Thoracotomy (high power electrocautery, 70-120 watts)

- Transurethral resection (cutting: 100-170 watts; coagulation: 70-120 watts, related to the thickness of the resection ring used and technique)

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