Let's start with the concerns of anesthesiologists, whose concerns are as follows:

Friendly man-machine interface, convenient and simple operation;

The function is practical, safe and stable;

Good performance, durable, good air tightness in long-term use;

Applicable to a wide range of anesthesia, adults, children, neonates;

Meet the monitoring of anesthesia: monitoring of airway pressure, volume monitoring, O2 monitoring, PEEP monitoring or setting, CO2, anesthetic gas concentration;

Perfect alarm function;

In response to these concerns of anesthesiologists, as hospital anesthesia machine procurement specialists and regional distributors need to acquire the necessary knowledge in the procurement process, it is necessary to read this article to conduct a quick review.

Solution: Let's start with the working principle of an anesthesia machine. The working diagram of an anesthesia machine is as follows:

1. Type of gas source: oxygen, nitrous oxide, air, carbon dioxide, helium-oxygen mixture. Gas supply: central gas supply pipeline, backup gas cylinder

Focus 1: Do you choose a single source of oxygen, a double source of oxygen and nitrous oxide, or a triple source of oxygen, nitrous oxide and air?

2. Flowmeter: Flowmeters are divided into mechanical flowmeters and electronic flowmeters. The applications of mechanical flowmeters in different grades of anesthesia machines are as follows:

Low-end anesthesia machine: dual circuits of oxygen and nitrous oxide

Mid-to-high-end anesthesia machine: three gas sources of oxygen, nitrous oxide and air. The mid-to-high-end anesthesia machine can supply impure oxygen to avoid pathological changes to the lungs caused by pure oxygen.

High-end anesthesia machines: generally have coarse adjustment tubes and fine adjustment tubes. Common scale range: coarse adjustment 1-10L, fine adjustment: 0-1L, fine adjustment is of great significance for anesthesia with low and micro flow

Electronic flow meters have the advantages of convenience, intuition, clarity, synchronization of operation and control, etc. In addition, some electronic flow meters can also display the flow rate with a bar graph on the ventilator screen.

Focus 2: Does your anesthesia machine have an electronic flow meter?

3. ACGO: What is the role of ACGO (Auxiliary Common Gas Outlet)?

As a portal for fresh gas output, it is used to connect the breathing circuit of the anesthesia machine and the breathing circuit outside the anesthesia machine (such as an external Bain circuit)

Focus 3: Does your anesthesia machine have ACGO function?

4. Vaporizer: The role of a good vaporizer is very important. Its functions are as follows:

Temperature compensation, a good vaporizer should accurately output the anesthetic required by the anesthesiologist in an environment of 15-35oC.

Anesthetics cannot be mixed in the same vaporizer.

Do not dump the vaporizer.

Choice of dosing and dispensing methods: dosing funnel, direct dosing pour fill; dosing cap: quick fill; dosing device, slow dosing key fill,

Focus 4: The brand of vaporizer recommends "PENLON"

5. Breathing circuit: breathing circuit is divided into fully open, semi-open, fully closed and so on. The role of the breathing circuit is very important, and it must be easy to disassemble. Because the rebreathing circuit is in contact with the exhaled gas of the patient, cross-infection will occur and respiratory diseases will be transmitted.

Focus 5: It is recommended to use a highly integrated integrated circuit, which is convenient for line management, replacement and maintenance, disinfection, disassembly and assembly.

6. Bypass function: when the soda lime tank is replaced, the outlet of the circuit is automatically closed, and there is no gas leakage, which can be replaced during surgery. In addition, if it has a heating function, it can eliminate condensed water.

Focus 6: With bypass function, preferably with heating function.

7. Ventilator: The working modes of the ventilator generally include the following: Volume Controlled Ventilation (VCV), Pressure Controlled Ventilation (PCV), Synchronized Intermittent Mandatory Ventilation (SIMV), Pressure Support Ventilation (PSV). Focus 7: Your anesthesia machine needs a highly safe, powerful ventilator.

8. Key sensors: flow sensor, solenoid proportional valve, differential pressure sensor, pressure regulating valve, PEEP valve, the control and monitoring of the ventilator depends on the performance of the above sensors. Recommended brand of flow sensor: Honeywell.

Focus 8: Focus on sensor performance.