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Anasthesia machine and it's block diagram.

Anaesthesia Machine:

  • An anaesthesia machine is a device which is used to deliver variable gas mixture of anaesthetic gas and air/oxygen gases to the patient’s respiratory system.
  Need Of Anaesthesia Machine:
  • Surgical Operations normally carried out under some form of Anaesthesia. The functions of anaesthesia are:
        1)     It ensures that the patient does not feel pain and minimizes patient discomfort.
        2)     It provides the surgeon with favourable conditions for the work.
Examples: Diethyl ether, Chloroform, Halothane, cyclopropane and Nitrous oxide.

·       Anaesthesia Machine block diagram:

 

 

  • Anaesthesia machine is consists of two subsystems :
(i)        Gas supply system: Gases are provided to the anaesthesia machine from either a pressurized hospital central supply or small storage cylinders attached to the machine. It includes pressure regulator, pressure guage, fail safe system, gas delivery units.

(ii)      Vapour Delivery: The various anaesthetic liquids are too strong to be used as pure vapours. They are thus diluted in a carrier gas such as air and/or oxygen, or nitrous oxide and oxygen. The device that allows vapourization of the liquid anaesthetic agent and its subsequent admixture with a carrier gas for administration to a patient is called a ‘Vapourizer’
.
(iii)    Delivery system: The function of a Delivery system is to deliver anaesthetic and respiratory gases to and from the patient.

(iv)    Humidification: Dry gases supplied by the anaesthesia machine may cause significant dryness of mucus. Therefore, air or anaesthetic gases need to be humidified.

(v)      Ventilator: The ventilator provides a positive force for transporting respiratory and anaesthetic gases into patient.

(vi)    Patient Circuit: The patient circuit consists of rubber tube, chrome plated tube fitting (T joint), rebreathing bag, Heidbrink valve and face mask.


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