Anesthetic breathing apparatus having volume reflector unit with controllable penetration

摘要

An anesthetic breathing apparatus and system, having a patient circle system for re-breathing exhaled gases by a patient, a volume reflector, a fresh gas delivery line, and a gas sensor unit arranged to measure a gas stream upstream a fresh gas connection and downstream said reflector unit. The gas sensor unit provides a signal for detection of a reflector driving gas (RDG) crossing over the volume reflector during inspiration based on at least one property of the gas stream measured by the gas sensor unit. Appropriate action may be taken based on this measurement, for instance in disclosed methods.

主权项

1. An anesthetic breathing apparatus comprising:
a patient circle system adapted to interact with a patient to allow re-breathing by the patient of gases exhaled by the patient; a common expiration and inspiration line in fluid communication with said patient circle; a volume reflector unit located in said common expiration and inspiration line, said volume reflector unit having a proximal end and a distal end, said distal end being connected via a reflector connection to said patient circle system, and said volume reflector unit comprising a reflector volume that receives patient gases from the patient circle system during expiration and said volume reflector unit being configured to return said patient gases from the reflector volume into the patient circle system during a subsequent inspiration; a reflector driving gas line configured to push a reflector driving gas into said proximal end of said volume reflector unit and to push said patient gases out of said distal end of said volume reflector unit during said inspiration into said common expiration and inspiration line and into said circle system; a fresh gas delivery line connected to said patient circle system at a fresh gas connection, said fresh gas connection being located downstream of said reflector connection in said patient circle system; a gas sensor unit configured to measure at least one property of a gas stream upstream of said fresh gas connection and downstream of said volume reflector unit and to generate a gas sensor signal representing said at least one property; and a control unit configured to receive said gas sensor signal and to detect, based on said at least one property of said gas stream measured by said gas sensor unit, a reflector driving gas that crosses over said volume reflector during said inspiration.