Arrangement for adding liquid anesthetic to the respiratory gas supplied to a patient

摘要

The invention is directed to an arrangement for adding liquid anesthetic medium to the respiratory gas to be directed to a patient and is applicable to a closed respiratory system wherein an adequate quantity of the anesthetic medium must be supplied in a small respiratory gas volume and is also applicable to an open system wherein large quantities of anesthetic medium are required. The arrangement of the invention includes a plurality of tanks containing anesthetic mediums and a selection switch which can be selectively switched to any one of the tanks. A pump is located after the selection switch and a change-over switch permits switching the anesthetic medium from the pump to an anesthetic medium vaporizer and a swirl chamber. The anesthetic medium is vaporized in the vaporizer and then conducted at high concentration into the respiratory gas directed to the patient. The gas can be guided in a closed system. In the swirl chamber, the anesthetic medium is vaporized into the fresh gas flow which then is conducted to the patient in the form of respiratory gas. A control arrangement monitors and, with data from corresponding measuring devices, controls the preselected sequences.