1 Safety protection and Accident treatment

1.1 The decompression device

This anesthesia machine system has several decompression devices.

This anesthesia machine is equipped with a compressed gas regulation device. Before entering the anesthesia machine ventilation system, the pressure regulator has already depressurized the input gas source to 400kPa. The output end of the pressure regulator is equipped with a safety valve. If the pressure regulator malfunctions or if the output pressure is too high due to human factors (less than twice the rated input pressure), the safety valve will automatically exhaust to ensure that the gas output pressure reaches the rated working pressure.

The anesthesia machine is equipped with a safety overflow valve inside, and when the external air source pressure exceeds 0.6MPa, it will automatically exhaust to ensure the normal operation of the anesthesia machine.

To prevent the pressure inside the anesthesia gas delivery device from exceeding 10kPa due to blockage of the fresh gas output port, a pressure relief device is installed between the flow meter and the evaporator gas circuit to prevent excessive pressure inside the delivery device.

In order to prevent excessive pressure in the anesthesia ventilation system during manual operation, this system is equipped with an adjustable pressure relief device (APL valve) installed in the anesthesia breathing circuit, with an adjustment range of ≤ 7.5kPa.

To prevent the pressure of the anesthesia breathing circuit from being too high during exhalation due to the high oxygen supply flow rate of the flow meter in the computer-controlled state, the air box connected in series in the anesthesia breathing circuit has a 4kPa safety overflow function. In the exhalation state controlled by the machine, when the pressure in the circuit exceeds this pressure, the bellows will automatically overflow to ensure that the airway pressure in the anesthesia breathing circuit does not exceed this value.

1.2 Sealing Performance of the breathing System

Connect the gas source and power, open the anesthesia ventilator. Set the anesthesia ventilator mode VCV, frequency: 10 times / min, I:E :1:8, decrease the tidal volume, and block the breathing pipeline of anesthesia breathing circuit, then observe the pressure waveform when the pressure of the anesthesia ventilator reaches the peak, see if the downward trend of the pressure is obvious. If there is no obvious downward trend, it indicates that the leakage doesn't exist in anesthesia ventilator low-pressure pipeline.

If there is gas leakage, then check the pipeline or reinsert all joints and see if there is some place which may cause leakage.

If these measures taken do not help to solve the problem, please notify our company and the authorized service agencies.

1.3 Breathing tube

If the anesthesia machine has been used for a long period, accumulation of water will appear in the breathing tube. The water should be removed immediately.

1.4 Fuses

The fuses of anesthesia ventilator are installed in the power socket of rear panel.

If the fuse is judged to be broken, then the steps of replacing the new fuse must be taken as follows:

1)Do not turn on the power switch when the Ventilator is working. Just pull out the Ventilator power line from the power socket and the Ventilator will automatically be converted to mode of emergency battery power supply. Now you can change the fuse.

2) Open the cover of fuse base and replace fuse tube.

3) The specifications of fuse tube: RF1-20 F2AL250V. The specifications of the emergency battery:5RF/ F5AL250V, but its fuse is installed inside the machine.

1.5 Low Pressure Hose Components

The oxygen, nitrous oxide conduits used on the machine are low pressure hoses. The hose material is inner layer PE, middle layer of high intensity terylene fiber, and the exterior layer of rubber. The inner layer PE will not have chemical reactions with oxygen, nitrous oxide, Without toxic substance, without harmful effluents, and it has a favorable compatibility with the gas. The inner diameter of the hose is 6mm, and the outer diameter is 12.5mm.

1.6 Improper Operation and Consequence treatment

Improper operation of anesthesia machine include:

1) Flow meter oxygen supplementation volume is too low or closed. While you use the anesthesia machine, the flow meter Oxygen supplementation is usually to ensure the oxygen concentration in the anesthesia breathing circuit. If the oxygen concentration is too low, it may jeopardize patient safety. Solution: Make sure that the flow of flow meter no less than 0.6 L / min.

2) Don’t fill up folding bag when the anesthesia ventilator is used to control breathing. Because in this state, the anesthesia ventilator air supply cannot be transferred to the patients’ body, so he/she cannot get enough ventilation for life. Solution: While using the anesthesia ventilator to control breathing, you should first use the fast oxygen supply to fill up the folding bag, so that the anesthesia breaching machine can properly make it work.

3) You use a anesthesia ventilator to control breathing, while the anesthesia breathing circuit is in manual state. Even though the folding bag is filled up, the anesthesia ventilator cannot drive the work of folding bag normally, so the patient cannot get enough ventilation for life. Solution: Make sure that the anesthesia breathing circuit is set in the "machine controlled" state when you use anesthesia ventilator to control breathing. Similarly, when the anesthesia ventilator is in "MANUAL" mode, the anesthesia breathing circuit should be set in the "manual controlled" state. In other words, the working mode of anesthesia ventilators and anesthesia breathing circuit must be consistent.

Improper operation of the evaporator: more details can be found in 6.1 5 the contents

Improper operation of the anesthesia ventilator :

1) If there is no well-grounded network power supply, it is easy to make the machine electrified, and it may lead to electric shock on patient or operator. The solution is to use well-grounded network power supply.

2) If the trigger sensitivity is set incorrectly, it may appear the phenomenon of continuous trigger in SIPPV or SIMV mode. Solution: At this point the trigger is just at the critical value, that’s why that phenomenon appears, all you need to do is to reduce the trigger sensitivity again.

1.7 The replacement of quick-wear parts, consumables and removable parts

Quick-wear parts in the anesthesia machine include: fuses, sealing ring;

Consumables in the anesthesia machine include:oxygen concentration sensor.

The specifications of the fuse can be seen in chapter 7.4.

Sealing ring has the following specifications: φ7x1.9, φ10 x1.9, φ12x2.1,φ15x2.65, φ20x2.65, φ22x1.9,φ40x3.3 .

Among which, φ7x1.9 is flow adjusting valve sealing ring; φ10 x1.9 is sealing ring at the inner connector of gas source delivery pipe; φ12x2.1 is sealing ring of pressure signal and fresh gas outlet; φ15x2.65 is the sealing ring in the evaporator interface seat;φ20x2.65 is the sealing ring outside evaporator interface seat and the sealing ring of oxygen concentration sensor; φ22x1.9 is the sealing ring at the pressurized gas outlet of the ventilator and φ40x3.3 is the sealing ring of breathing valve in integrated anesthesia breathing circuit .

Refer to the 9.3 chapter for relevant contents about the oxygen concentration sensor.

Removable parts in anesthesia machine are as follows: the breathing tube, oxygen mask, flow sampling tube, oxygen concentration sensor, bellows, and inspiratory and expiratory valve in anesthesia breathing circuit and Sodium lime tank. Among which, the breathing tube and oxygen mask need to be equipped by the users, not our company.

The replacement method of fuse refers to the content in chapter 7.4.

The breathing tube and oxygen mask are both removable parts. Each time its installation must follow the content in chapter 5.2 5

The replacement method of flow sampling tube: this anesthesia ventilator is equipped with standby flow sampling tube, if the original one is damaged, you can replace a new one. Its installation method refers to the content in chapter 5.2 6.

Method of replacing oxygen concentration sensor: if the monitoring is inaccurate or shows nothing because of oxygen concentration drainage, then the user should replace it with new oxygen concentration sensor, and please contact the after-sale service department of our company. Refer to relevant contents of integrated breathing tube for the connecting method of oxygen concentration sensor in chapter 2.2.3.

Bellows components replacement: the bellows components include 1-6 parts in Fig. 3.

If the bellows components is leaking or damaged, the users must contact our company’s after-sale service department, in addition, operate them under our guidance or replace&repair them by technical professionals from our company.

The replacement of inspiratory and expiratory valve in anesthesia breathing circuit: if the valve housing or the respiration valve in the valve housing of anesthesia breathing circuit is damaged, cracked, you need to replace the alternate valve housing, respiration valve provided by our company.

Replacement of sodium lime tank: if the sodium lime tank in the anesthesia breathing circuit is damaged or cracked, the user must contact the after-sale service department of our company.

1.8 Other security protection and accident treatment

1) In order to prevent the connection errors of input oxygen, nitrous oxide to the anesthesia machine, and each pipe is marked.

2) The color difference of gas in internal pipeline: the oxygen pipe is blue, the nitrous oxide pipe is colorless and transparent, and the gas mixture pipe is orange.

3) While you add anesthetic agents to evaporator, the liquid level can neither exceeds the Higher limit nor the lower limit on observation window.

4) The evaporator tilt shall not exceed 45 °. You have to press the zero lock-switch first to rotate the concentration setting dial. The evaporator should not impose excessive pressure, otherwise it may damage the internal parts. It has been tested carefully and cannot be dismantled. It cannot be disinfected, but dried with medical compressed oxygen, if there are problems, you must deliver it to the manufacture to check.

5) During transportation, the evaporator must be removed from anesthesia machine and individually wrapped. The inner part of it must be completely empty and you also need to dry it with medical compressed oxygen for 3 to 5 minutes.

6) For the oxygen has a combustion aiding function, the oxygen pressure gauge and oxygen flow adjusting valve should not be close to grease.

7) There must be well-grounded wire while you use this machine to ensure personnel safety.

8) The composition of anesthesia ventilator driving gas and patient breathing gas are irrelevant. Therefore, you need to turn on the anesthesia machine oxygen flow switch while you use the anesthesia ventilator to ventilate , keep providing a suitable flow of fresh oxygen to avoid oxygen deficit accident.

9) If the folding bag does not return to the initial level when the patient exhales, it may be due to a leak in the anesthesia breathing circuit. It should be checked and corrected in a timely manner, and the oxygen supply flow compensation should be appropriately increased to ensure sufficient ventilation. Or it may be due to the anesthesia ventilator setting turning on the positive end expiratory pressure, resulting in a positive end expiratory pressure that prevents the folding capsule from returning to its initial state. If it does not affect the patient's physiological condition, the positive end expiratory pressure function can be turned off.

10) Emergency battery need to be charged in time after use, and the time interval should not be more than 24 hours.

The emergency battery's specification is DC 14.8V-2.2AH. Otherwise it will affect the usage time.(the operator must not change emergency battery by himself)

11) Anesthesia ventilator uses RF1-20 / F2AL250V cartridge fuse. While replacing the fuse, you should disconnect the power first and then open the fuse box with tools, at last, wrap the fuse box well with tools after replacing it.

12) The pressure and flow characteristics of any gas power output port within the rated input pressure range and twice of the maximum rated input pressure have not been changed.