1 composition of unipolar electric knife

Unipolar electric knife generally by the host, electric knife pen, foot control switch and negative plate (line) composition.

2 The principle of unipolar electric knife

Using 300-500HZ high frequency current, the release of heat and discharge on the tissue cutting, bleeding. The electric current forms high temperature, heat energy and discharge at the tip of the electric knife, which makes the contacting tissue dehydrate, decompose, evaporate and blood coagulate rapidly.

3 The application range of unipolar electric knife

Unipolar electrosurgical knife is widely used in surgery, dermatology, dentistry, according to its function can be used for cutting different tissues.

(1) pure cutting function: it is mainly used for cutting any tissue clearly, accurately and without damage.

(2) mixed cutting function: it is used for cutting any tissue and has good coagulation function.

(3) there are three types of coagulation function:

a、Low-pressure contact clotting (desicate/low) : commonly used for laparoscopic surgery and fine-tissue clotting.

b、Non-contact clotting (fulgurate/Med) : works on most tissues and is suitable for most operations.

c、Spray/high: Used to bleed large areas of tissue and form a very thin layer of tissue-charred pods.

4 Operation Steps

1. Connect power cord, negative plate circuit.

2. Turn on the power supply, boot self-check, according to the instructions and surgery to choose the appropriate output power.

3. The negative plate is affixed to the right part of the patient's musculature.

4. Connect electric knife and pen circuit, use manual or foot switch.

5. After using the first off the main power, then dial the power plug.

5 points to note

1. High-frequency electric knives should be operated by trained medical personnel, even before the use of a new electric knife should be carefully read the instructions, in order to prevent misoperation caused by safety problems.

2. Choice of negative plate: hard negative plate than soft negative plate security, double-circuit negative plate than single-circuit negative plate security, must pay attention to the use of observation.

3. When the output power reaches 100 ~ 700W, it is extremely easy to burn or dry other electronic equipment.

4. Negative plate area: more than 100CM2. It is generally required that the effective conductive area of the negative plate for children be 65 CM2. The effective conductive area of adults is 129cm2, once the effective contact area is reduced, the resistance increases to unsafe levels, the machine automatically alarm and stop output. If the temperature of the plate exceeds 6 ° C of skin temperature, burns may occur.

5. Where to place the negative plate:

1 inappropriate sites: bony protrusions, scars, skin wrinkles, fat tissue or fat thickness, epidermis, weight bearing sites, sites where fluid may accumulate, near metal grafts or pacemakers.

2 suitable parts: easy-to-observe parts, smooth muscle area, shaved skin, clean dry skin, the negative plate should be more than 15cm away from the ECG electrode; As close as possible to the surgical incision site to reduce the current loop, but first consider the ideal paste sites such as: calf, thigh, buttocks, waist, back, abdomen, upper limbs; The long side of the negative plate is perpendicular to the high-frequency current, and the long side of the negative plate is perpendicular to the high-frequency current.

3 the baby negative plate: the part chooses the thigh, the back, the abdomen and so on flat muscle area, 15kg below the child should choose the baby negative plate.

6. One-time use of soft negative plate notes:

1 should be kept flat, prohibit cutting and folding.

2 one-time use, do not re-use: because after use, the negative plate surface of the conductive adhesive adheres to the dander, hair, the physical and chemical properties of the change, poor conductivity, reduced safety, the patient is more likely to get a burn. If the negative plate is used at the same time, it may carry the dandruff of bacteria, HIV, HBV or skin disease patients. If the same negative plate is used repeatedly among different patients, cross infection may occur.

3 remove the negative plate should be removed from the edge along the direction of the skin grain slowly to avoid too fast, excessive force, resulting in mechanical damage.

7. Note: remove the eschar on the head of the electric knife in time, keep good conduction function, do not use sharp tool to scrape the surface of the head of the electric knife, use special electric knife or wet saline gauze wipe; When the electric knife is not used temporarily, it should be put into an insulating container. Do not put it on the part that obstructs the doctor's operation and the exposed body surface of the patient to avoid causing burns to the medical staff and patients.

8. High-frequency, unipolar artificial pacemaker are not allowed in patients who have them.

9. Avoid direct contact between the patient's limbs and metal during the use, the patient and metal bed to maintain at least 4 cm thickness between the insulation layer, if necessary, can use cloth, hand board fixed limbs.

10. The Electric Knife Pen is a disposable article and is destroyed after use.