Anesthetic breathing apparatus having improved monitoring of anesthetic agent

摘要

An anesthetic breathing apparatus has a first gas analyzer arranged to provide gas measurement data related to a first sample point to a control unit that is arranged in a servo or feedback control system configured to adjust delivery of a vaporized anesthetic agent from an anesthetic vaporizer to a delivery point in an inspiratory branch of a breathing circuit of the anesthetic breathing apparatus, The first sampling point is arranged in the breathing circuit downstream and close to the delivery point. A second gas analyzer arranged to be operated in a first mode of operation to provide gas measurement data for patient monitoring, and arranged to be operated in a second mode of operation to provide gas measurement data to the control unit. A switch over unit is fluidly connected to the second gas analyzer, and arranged to switch fluid communication of said second gas analyzer between the first sample point for the second mode of operation and a second sample point for the first mode of operation. The second sample point is arranged in a patient tubing close to a Y-piece at a patient connected to the breathing circuit.

主权项

1. A method of monitoring anesthetic agents in an anesthetic breathing apparatus, wherein said anesthetic breathing apparatus comprises a control unit, a breathing circuit in fluidic connection with an anesthetic agent delivery device, a first gas analyzer, and a second gas analyzer, said method comprising:
providing first gas measurement data for gas sampled from a first sample point from said first gas analyzer to a said control unit, wherein said first sampling point is arranged in an inspiratory branch of said breathing circuit downstream from and in proximity of an anesthetic agent delivery point; adjusting delivery of a vaporized anesthetic agent from said anesthetic agent delivery device to said anesthetic agent delivery point in an inspiratory branch of said breathing circuit by said control unit in a feedback control system, providing second gas measurement data from a second gas analyzer in a first mode of operation and in a second mode of operation; and switching said second gas analyzer between said first and second modes of operation; wherein: said switching between said first and second modes of operation comprises switching fluid communication of said second gas analyzer between said first sample point for said second mode of operation and a second sample point arranged in a patient tubing close to a Y-piece at a patient connected to said breathing circuit for said first mode of operation and said switching between said first and second modes of operation comprises controlling a switch over unit fluidly connecting said second gas analyzer to said first and second sample points.