Method for determining gases proportions in an inhalable medical gaseous composition and inhalation temperature of such inhalable medical gaseous composition

A method for determining an inhalation temperature value for an inhalable medical gaseous composition, consisting of three gases including a first noble gas, a second noble gas and oxygen, in order to reach a body temperature target value depending on parameters including proportion of first noble gas, proportion of second noble gas, oxygen proportion and said body temperature target value, comprising:

• setting up of a proportion table wherein gases proportions are indicated for several body temperature target values and inhalation temperature values, at least one gas proportion being calculated by:
• determining, for a given inhalation temperature value of the inhalable medical gaseous composition, a first body temperature theoretical value, for the first noble gas modeled by a first reference regression line,
• determining for said given inhalation temperature value, a second body temperature theoretical value, for the second noble gas modeled by a second reference regression line,
• calculating a highest gap as a difference between the first body temperature theoretical value and the second body temperature theoretical value,
• calculating a target gap as a difference between said body temperature target value and any one of the first body temperature theoretical value and the second body temperature theoretical value,
• calculating a ratio between said target gap and said highest gap, said ratio representing said proportion of first noble gas or second noble gas in said inhalable medical gaseous composition, and
• calculating said first noble gas or second noble gas proportion taking into account the oxygen proportion in said inhalable medical gaseous composition.

A computing device, comprising:

• processing circuitry configured to
• determine gases proportions to obtain an inhalable medical gaseous composition consisting of three gases including a first noble gas, a second noble gas and oxygen, in order to reach a body temperature target value,
• wherein the processing circuitry is further configured to determine a proportion of a first noble gas or a second noble gas of said inhalable medical gaseous composition, depending on predetermined parameters including said body temperature target value, an inhalation temperature value of said inhalable medical gaseous composition, and an oxygen proportion in the inhalable medical gaseous composition,
• wherein the processing circuitry is further configured to determine of the proportion of the first noble gas or the second noble gas by being further configured to
• determine, for said inhalation temperature value, a first body temperature theoretical value, for the first noble gas modeled by a first reference regression line,
• determine for said inhalation temperature value, a second body temperature theoretical value, for the second noble gas modeled by a second reference regression line,
• calculate a highest gap as a difference between the first body temperature theoretical value and the second body temperature theoretical value,
• calculate a target gap as a difference between said body temperature target value and any one of the first body temperature theoretical value and the second body temperature theoretical value,
• calculate a ratio between said target gap and said highest gap, said ratio representing said proportion of first noble gas or second noble gas in said inhalable medical gaseous composition, and
• calculate said first noble gas or second noble gas proportion depending on the ratio and the oxygen proportion.