Patient hose heating for respirator - has heat exchanger heated by controlled heating element between breathing gas humidifier and inspiration hose

摘要

The breathing gas is directly heated in a concentrated heat exchanger (2) after passing the humidifier (1). It is heated to such a level that it does not cause condensation, even after passing the unheated inspiration hose (3). The heating element (9) power is set by a temp.-regulating circuit. A temp. sensor (13) in the inspiration hose is pref. installed directly on the localising tubular connector, a further temp. sensor (12) being placed approx. 30 cm in front of the latter. A min. temp. evaluator (14) ensures that the temp. regulator (10) is supplied with the lower temp. value of both sensors as the actual value. Water vapour condensation can also be avoided if the hose heating is used in an incubator by placing the main temp. sensor (13) outside the wall of the incubator (16). ADVANTAGE - Easier handling with reduced cost and risk of fault.