High-frequency Electrosurgical Unit
Cutting principle
When the high-frequency high-voltage current generated by the high-frequency electric knife passes through the high-impedance tissue, it will generate heat in the tissue, causing the tissue to vaporize or coagulate. During electrosurgical use, the resistance varies from 100 ohms to 2000 ohms. As the tissues solidify, the water in the cells will vaporize, drying the tissues, causing the resistance to continue to increase, and finally the current is completely stopped
The Use
And more and more are used in various endoscopic operations, such as: laparoscopy, prostatoscope, gastroscopy, cystoscopy, hysteroscopy and other operations.
Because the high-frequency electrosurgical knife can cut and coagulate at the same time, it is widely used in operations that are difficult to access and perform with a mechanical scalpel (such as: abdominal duct ligation, prostatic urethral mass removal).
The outstanding coagulation effect of the high-frequency electrosurgical knife makes it widely used in the operation of diffuse bleeding sites such as liver, spleen, thyroid, breast, and lungs.
Other functions
In addition to basic functions such as performing operations, a full-featured high-frequency electrosurgical unit also has the following important functions:
1. Output power indication;
2. Power preset and adjustment;
3. Patient plate detection alarm;
4. Work audio instructions;
5. The output port has the function of preventing misplugging;
6. Hand control and foot control functions.
The Advantage
1. Fast cutting speed, good hemostatic effect, simple operation, safe and convenient.
2. Compared with traditional mechanical scalpels, the use of high-frequency electric scalpels in clinical practice can greatly shorten the operation time, reduce the patient's blood loss and blood transfusion, thereby reducing complications and surgical costs.
3. Compared with other electrosurgical instruments (such as laser knives, microwave knives, ultrasonic knives, water knives, semiconductor thermocoagulation knives, etc.), high-frequency electric knives are suitable for a wide range of operations, easy to enter the surgical site, simple operation, and reasonable cost-performance And other advantages.
Precautions
1. There should be no flammable and explosive gases, liquids or other substances in the operating room, because sparks and arcs will be generated during high-frequency electric knife surgery, and flammable and explosive materials will burn or explode when encountering sparks and arcs.
2. Patients with pacemakers generally cannot use high-frequency electrocautery, because high-frequency will interfere with the pacemaker, causing it to work abnormally or even stop. If you must use a high-frequency electric knife, you must take necessary and effective preventive measures in accordance with the pacemaker's instruction manual.
3. The pole plates must be correctly connected and placed, and the contact surface with the patient's skin must be large enough.
4. Do not blindly increase the output power of the electrosurgical knife, so as to just guarantee the effect of the operation. Because any danger in high-frequency electrosurgical surgery increases with the increase of power. When the power required for the operation is significantly greater than the normal value (generally the power used for electrosurgical surgery is about 20-80W, special operations such as amputation require more, and the single pole rarely exceeds 200W), you should check the placement of the electrode plate, the electrode plate and the Do not increase the output power setting value at will for the integrity of the cutter head cable, the condition of the machine and the degree of patient suspension. When the normal power cannot be predicted, it should be tested gradually from small to large until it is just ready for use. Ensure that the output power is set at a low value before the machine is used and before the machine is turned on, otherwise the excessive power is suddenly added to the patient.
