①Advantages: Relieve pressure in time to prevent animal lungs from being overstressed.
②Disadvantage: Part of isoflurane and oxygen are wasted, and isoflurane will pollute the air (need to connect exhaust gas absorption device).
2. Open the main valve of the oxygen cylinder of the animal anesthesia machine, and adjust the output pressure to 0.2~0.3MPa, not more than 0.4MPa.
①If the pressure is too high, it is easy to collapse the tube.
②The pressure is too low and the air volume is not enough to meet the needs of animals.
3. Transition stage: The "3-3-3" principle is recommended, so that animals can quickly and smoothly transition from the induction anesthesia stage to the maintenance anesthesia stage.
①The first 3 minutes after intubation.
②The oxygen flow is adjusted to 3L/min (it has nothing to do with the size, breed, etc. of the animal).
③Adjust the anesthesia concentration to the scale "3" (it has nothing to do with the size, breed, etc. of the animal).
4. Maintenance of anesthesia
①From the 4th minute.
②Adjust the oxygen flow meter: according to the weight of the animal, 100-150mL/Kg/min.
③Adjust the concentration of anesthesia: It is related to the animal's body weight, physiological and pathological state, sensitivity to anesthesia and the length of operation, etc., and can be adjusted flexibly according to the specific situation.
④Monitoring during surgery is extremely important: breathing, heart rate, blood oxygen, etc.
5. Monitoring of airway pressure gauge
During the operation, it is necessary to ensure that the animal anesthesia machine has the correct airway pressure, so as not to affect the lung function or cause complications.
6. Weaning after surgery
①Turn off the anesthesia tank first, or you can choose to turn off the animal anesthesia machine in advance during the skin suture (conducive to accelerating the recovery of the animal).
②Let the animal inhale pure oxygen (there will be more or less anesthetic gas remaining in the pipeline) and wait for it to wake up.
③ When the animal begins to become conscious, remove the tracheal intubation and remove the animal anesthesia machine.
④ After weaning, remember not to adjust the oxygen flowmeter to the smallest size (because all the pressure is stored between the flowmeter and the anesthesia tank when the main oxygen valve is not closed, which is easy to collapse), first close the main valve of the oxygen cylinder , press the quick oxygen filling valve to discharge the residual gas, make the pointer of the oxygen pressure gauge and the output pressure gauge return to zero, and then turn off the gas circuit switch to end.