Ultrasonic knife refers to focusing high-intensity ultrasound on the end of the knife through the horn, and the strong vibration of the knife can crush soft tissues such as liver and brain. This method is used clinically to remove human soft tissue tumors. The crushed tumor tissue fragments are washed and sucked out at any time, and the surrounding blood vessels and nerves are not easily damaged. So it is called the bloodless scalpel.

A complete set of ultrasonic knife equipment is composed of the following parts: frame, host, handle, foot control device, knife head and other parts. General cutter heads are consumables, and Johnson & Johnson's cutter heads are all disposable. Comparison of Ultrasonic Knife and Other Cutting Instruments The main body of the ultrasonic knife system conducts current to the handle, and the piezoelectric ceramic sheet in the handle activates the work. The ceramic sheet converts electrical energy into mechanical energy, generates longitudinal mechanical vibration and expands at the conduction shaft node, which is transmitted to the cutter head The bite reaches the maximum 55.5kHz vibration, the cutter head contacts the tissue protein, the hydrogen bond of the protein is broken and the protein structure is reorganized, the protein coagulates and closes the small tube cavity, and the protein is subjected to vibration to generate secondary energy energy, and deep coagulation closes the larger tube cavity. So as to achieve the effect of cutting, clotting tissue and hemostasis. After comparing with scalpels, electric knives, laser knives and other instruments, it is found that ultrasonic knives have unique advantages.

The advantages of the ultrasonic knife only produce small water droplets without smoke, and the surgical field of vision is clear. The thermal effect is small, and the operating heat is 80℃～100℃; the thermal damage is small, and the damage is within 3mm. It has the functions of tissue cutting, coagulation and separation, and can precisely control the cutting and coagulation range, shortening the operation time and reducing intraoperative bleeding. There is no possibility of electrical damage. There is less tissue adhesion, less eschar formation, and less postoperative complications. Postoperative adhesions were few and the incision healed quickly. The rapid oscillation has a self-cleaning effect, and there will be no adhesion between the knife and the tissue. Suitable for patients with pacemakers. It is suitable for laparoscopic surgery during pregnancy. It can be used to deal with extensive adhesions of the greater omentum, the omentum fat is disconnected without electrocoagulation contracture, the incision is neat, and the omentum blood vessels are completely coagulated.

Clinical application and development trend The development of hospitals and departments depends on the development and improvement of clinical medical technology and the improvement of disease diagnosis and treatment methods. As an important part of the hospital's surgical system, the development of its surgical technology is largely determined by the development and improvement of surgical technology. At present, the development trend of surgical technology is more and more towards minimally invasive, and ultrasonic scalpel surgery is one of the important components of minimally invasive surgery. The main advantages of minimally invasive surgery are: less surgical trauma, faster postoperative recovery, and significantly shorter hospital stay; slight postoperative pain; reduced chance of blood loss during surgery (90% of laparoscopic surgery basically has no bleeding); simple postoperative treatment and lower cost As a result, patients also benefit from shortening the time of sick leave, returning to work earlier, and reducing the burden of family care. Traditional electrosurgicals (unipolar electrosurgical or bipolar electrosurgical) cannot solve the defects of too wide heat conduction range (prone to cause secondary damage to important organs), ineffective treatment of blood vessels, and large smoke affecting the field of vision, which severely restrict micro Expansion of the scope of invasive surgery. Until the birth of the ultrasonic cutting hemostatic knife in 1996, the minimally invasive technology has been developed by leaps and bounds, so that the minimally invasive surgical technology based on ultrasonic scalpel surgery can be widely used in various surgical fields.