Siemens Aktiengesellschaft

George Psaros

Sven-Gunnar Olsson

A method and apparatus for the re-use of anesthetic gases which are not absorbed by a patient, in inhalation anesthesia make use of an adsorption filter during exhalation, the unused anesthetic gases being subsequently desorbed from the adsorption filter during inhalation, and being reintroduced into the respiration flow to the patient. The exhaled gas is supplied through an absorber for carbon dioxide before it is re-supplied to the patient. The apparatus includes a common line for the delivery and discharge of anesthesia and respiration gases to and from a patient. An adsorption filter for adsorption and desorption of anesthetic gases is arranged in this line. To prevent the carbon dioxide from the exhalation gas of the patient, which is adsorbed in the adsorption material, from being re-supplied to the patient in the next inhalation phase, the common line between the patient and the adsorption filter is at least partially divided into an inhalation branch and an exhalation branch, with an absorber for carbon dioxide disposed in the inhalation branch, sized to match the small amount of carbon dioxide left in the reintroduced gas.

Growing community of inventors

Tullinge, Sweden

George Psaros