Anethseia Machine
1.Structural Characteristics and Operating Principles
This anesthesia machine consists of a main unit, an anesthetic vaporizer, a flow meter, an anesthesia respirator and a respiratory circuit system.
2.1 Anesthesia Machine Main Unit
The structure and operating principles of the main unit are as shown
The flow meter not only can indicate but also can adjust the flow rates of the oxygen and nitrous oxide. A “oxygen-nitrous oxide linkage device” and “nitrous oxide cut-off equipment” are installed between the oxygen flow regulator valve and laughing gas flow regulator valve. Their functions: when only the oxygen flow regulator valve is opened, laughing gas flow may be closed; but if the laughing gas flow regulator valve is opened, the oxygen flow regulator valve will inevitably be opened by the link mechanism to ensure the oxygen concentration required by the patient. After the oxygen and laughing flows are opened, the oxygen flow rate will decrease if the oxygen flow rate is decreased gradually. When the pressure of the oxygen entering the flow meter is lower than 0.20MPa±0.05MPa, the flow meter will automatically close the laughing gas flow. At the flow meter outlet, oxygen and laughing gas are mixed with each other and then enter the anesthetic vaporizer.
If the anesthesia machine is equipped with two vaporizers and such two vaporizers are connected in series, when one vaporizer is activated the other one cannot be activated and this can ensure that only one vaporizer can work at any time to ensure patient safety. The mixed gas flowing out from the anesthetic vaporizer flows through a one-way valve to the gas outlet. Then it passes through a transition interface to enter the recirculation circuit to be described later in this manual.
When the anesthesia machine is in operation, the pressure at the gas output port will be caused to be always at a fluctuating level by turning on the rapid switch. The one-way valve isolates the adverse impacts that such fluctuating pressure has on the vaporizer.
2.2 Anesthetic Recirculation Circuit
The anesthetic recirculation circuit, also called patient circuit, is a combination gas circuit device connected with the patient. Its main function is to transmit mixed anesthetic gases to the patient and allow the patient to normally inhale oxygen and exhale carbon dioxide through such system. It can operate in the “Maneuvering” or “Manual” mode. The so-called “Maneuvering Mode” refers to the mode in which the patient’s respiratory function is managed by using the anesthetic respirator. The so-called “Manual” mode refers to the mode in which an anesthetist controls the respiration of the patient by pressing the air storage bag connected on the recirculation circuit.
An integrated anesthetic recirculation circuit is used on the YJ-8502 Anesthesia Machine.
1.Manual/Maneuvering changeover valve
2.Common gas inlet
3.Gas storage bag connection port
4.Carbon dioxide absorber
5.Exhalation valve
6.Exhalation screwed pipe port
7.Inhalation screwed pipe port
8.Inhalation valve
9.Pressure gauge
10.APL safety valve
11.Air bellow
12.Driving gas inlet
13.Pressure signal
14.Oxygen concentration sensor interface
15.Waste gas exhaust port
16.Connection with 17 through screwed pipe
17.Connection with 16 through screwed pipe
