Patent ID: 11925756
Assignee: SHENZHEN MINDRAY SCIENTIFIC CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 12:
13. An anesthesia machine, comprising an anesthetic output concentration monitoring device, wherein the anesthetic output concentration monitoring device comprises a first flow sensor, a second flow sensor, an anesthetic concentration sensor, a processor, and a memory,
wherein the processor is configured to execute a computer program stored in the memory to:
control the first flow sensor to monitor a flow of a fresh gas flowing into a breathing circuit to obtain a fresh gas flow rate;
control the second flow sensor to monitor a flow of an inhaled gas of an anesthetized object to obtain an inhaled gas flow rate;
when the inhaled gas flow rate is greater than the fresh gas flow rate, control the anesthetic concentration sensor to monitor concentrations of anesthetic in the inhaled gas and an exhaled gas of the anesthetized object to obtain an inhaled gas anesthetic concentration and an exhaled gas anesthetic concentration, respectively;
use the exhaled gas anesthetic concentration and a concentration of carbon dioxide in the exhaled gas to calculate a concentration of anesthetic in a gas reflowing into an inspiratory branch, in the exhaled gas, to obtain a re-inhaled gas anesthetic concentration; and
use the fresh gas flow rate, the inhaled gas flow rate, the inhaled gas anesthetic concentration, and the re-inhaled gas anesthetic concentration to calculate a concentration of output anesthetic of an anesthetic output device to obtain an anesthetic output concentration.