A HUMAN NECESSITIES
A61 MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61M DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
A61M16/00 Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
A61M16/20 Valves specially adapted to medical respiratory devices
A61M16/201 Controlled valves
A61M16/202 electrically actuated