Disposable medical electric knife circuit pad double circuit negative plate without wire

Working principle of negative plate
The negative pole loop gasket is made up of polymer gel, conductive cloth and conductor
It is different from the negative plate
The conductive layer of negative pole loop pad is not directly contacted with the patient through the conductive adhesive, but is wrapped in the insulating polymer gel
By using the principle of capacitance, the conductive layer can be regarded as the two conductor of capacitance, and the polymer gel is regarded as the insulating dielectric
Because the high-frequency electric knife uses AC, the AC is allowed to pass through through through the charge and discharge characteristics of the capacitor, so as to form a circuit
When the contact area is reduced, the conductor area is reduced, the capacitance impedance is increased, and the loop current intensity is reduced to avoid burns

Advantages and disadvantages of negative plate
(1) It is applicable to a wide range, such as burn patients, allergic skin, physical weight loss or other patients who are not suitable for the use of adhesive negative plate, and the preoperative preparation time is short

(2) If the negative plate contact quality detection system of the electric knife cannot be activated, the output current efficiency may be low and higher set power may be required due to too large impedance or too thick dielectric

(3) If the patient directly touches the hard part of the loop pad or cable, the patient may be crushed during long-term operation

(4) For metal implants, due to large reflux area and dispersed current, they will not cause local burns and can be used
However, for the cardiac pacemaker, the current will cause interference when passing through, which will affect the patients
All patients with cardiac pacemaker are recommended to use it with caution