초록

A method and an apparatus are described for determining the partial pressures of gases in blood, in which a membrane filter is used to separate plasma which passes to a blood gas analyzer.

대표청구항 ▼

A method for determining the partial pressure of at least one gas in blood flowing in an extracorporeal circuit, comprising the steps of separating plasma containing a gas from the blood at a membrane filter, and bringing the plasma containing the gas into contact with at least one sensor responsive

A method for determining the partial pressure of at least one gas in blood flowing in an extracorporeal circuit, comprising the steps of separating plasma containing a gas from the blood at a membrane filter, and bringing the plasma containing the gas into contact with at least one sensor responsive to the partial pressure of the gas, air being continuously excluded from the plasma and the partial pressure of the gas then being measured in the plasma during the exclusion of air. An apparatus for determining the partial pressure of at least one gas in blood comprising: a liquid filter having a chamber space, a semipermeable membrane having an exclusion limit of at least 40,000 atomic mass units but not greater than an exclusion limit wherein the membrane is capable of separating plasma from blood, said membrane dividing the chamber space into first and second chambers, means defining an extracorporeal blood circuit connected with the first chamber, at least one sensor for determining the partial pressure of a gas, a first liquid duct connecting the at least one sensor with the second chamber of the filter, the second chamber having a single outlet connected with the first liquid duct, and a unit, placed in the first liquid duct, for conveying liquid derived from blood through the membrane of the filter.