The anesthesia machine is used to in the hospital and clinics. The most common use is the continuous flow type. It is designed to provide an accurate and continuous supply of medical gases. It is mixed with an accurate concentration of anesthetic vapour, and deliver it to the patient at a safe pressure and flow. But the modern machines incorporate the ventilator, and patient monitoring devices.
Simpler anesthetic apparatus may be used in special circumstances, such as the Apparatus, a simplified anesthesia delivery system invented for the British armed forces, which is light and portable and may be used effectively even when no medical gases are available. This device has unidirectional valves which suck in ambient air which can be enriched with oxygen from a cylinder, with the help of a set of bellows. A large number of draw-over type of anesthesia devices are still in use in India for administering an air-ether mixture to the patient, which can be enriched with oxygen. But the advent of the cautery has sounded the death knell to this device, due to the explosion hazard.
Many of the early innovations in U.S. anesthetic equipment, including the closed circuit carbon-dioxide absorber and diffusion of such equipment to anesthetists within the United States can be attributed to Richard von and Company.
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