Made in China
Drager Narkomed 2A
Ohmeda Aestiva
A Datex Ohmeda British machine
The commonest type of anaesthetic machine in use in the developed world is theachine, which is designed to provide an accurate and continuous supply of medical gases ( such as oxygen and nitrous oxide ), mixed with an accurate concentration of anesthetic vapour (such as isoflurane), and deliver this to the patient at a safe pressure and flow. Modern machines incorporate a ventilator, suction unit, and patient-monitoring devices.
Ⅰ The gas delivery system
Ⅰ-Ⅰ Oxygen supply Ⅰ-Ⅱ Piped gases Ⅰ-Ⅲ Flow control valves Ⅰ-Ⅳ Flowmeters Ⅰ-Ⅴ Vaporizers Ⅰ-Ⅵ The common gas outlet Ⅰ-Ⅶ Oxygen flush valve
Anesthesia Machine
Second Medical College 三峡大学仁和医院 Jian Dao-lin 简道林
Overview ⅠThe gas delivery system Ⅱ Breathing systems Ⅲ Anesthesia ventilator Ⅳ Safety features Ⅴ Scavenging Ⅵ Gas analysis Ⅶ Accessories Ⅷ New generation anesthesia machines
Ⅰ-ⅠOxygen supply
1.Central oxygen supply system Liquid oxygen
2. Oxygen bank (smaller oxygen cylinders or tanks)
Ⅰ-Ⅱ Piped gases
Wall outlets supply oxygen, nitrous oxide and air at a pressure of 50 to 55 pounds/in2 (psi). These outlets and the supply hoses ( corrugated tube ) to the machine are diameter indexed and colorcoded.
A schematic diagram of an anesthesia machine
Non-rebreathing Systems
rebreathing system (Vaporizer-in-the-Circle)
rebreathing system(Vaporizer-out-of-the-Circle)
The function of the anesthesia machine is to prepare a gas mixture of precisely known but variable composition. The machine provides a controlled flow of oxygen, nitrous oxide, air, and anesthetic vapors. These are delivered to a breathing system, which provides a means to deliver positive pressure ventilation and to control alveolar carbon dioxide by minimizing rebreathing and/or by absorbing carbon dioxide. A mechanical ventilator is connected to the breathing system, freeing up the anesthetist's hands for other tasks. Several types of monitors are used to observe the function of the system, to detect equipment failures, and to provide information about the patient.
Overview
Definition
Anesthesiologists define the machine which is used to support the administration of anesthesia as the anesthesia machine. The original concept was invented by the British anesthetist H.E.G. Boyle in 1917. Prior to this time, anesthetists often carried all their equipment with them, but the development of heavy, bulky cylinder storage and increasingly elaborate airway equipment meant that this was no longer practical for most circumstances.