US 6,280,382 B1 · Compensation of concentration values concerning a patient

Abstract

The invention relates to a method for compensating measured concentration values of a first chemical compound (A) within a first internal tract (1*) of a patient, which concentration values (PA) are rendered by a second chemical compound (B), which is becoming present in the body of said patient, to deviate from actual concentration when mixing with the first chemical compound within said first internal tract. Concentration values (EB) of at least said second chemical compound (B) in a second tract (2*) of said patient is measured or derived several times and estimated concentration values (CB) of said second chemical compound is determined simulating its non-detected concentrations in said first internal tract of the patient. The measured initial concentration values (PA) of said first chemical compound (A) in the first internal tract (1*) is corrected by a compensating factor (Fc), whereafter said successive and corrected concentration values (CA) are the respective one for display and/or further use.

Claims22

Dependent claims

Method for compensating measured concentration values of at least a first chemical compound (A) within a first internal tract (1*) of a patient, which concentration values (PA) as measured are affected by a second chemical compound (B), which is becoming present in the body of said patient and has a limited transfer speed to mix with the first chemical compound at least in a detection site for said measured concentration values (PA), rendering these measured concentration values (PA) to deviate from actual concentration values (PRA) within said first internal tract (1*), characterised in that concentration values (EB) of at least said second chemical compound (B) in a second tract (2*) of said patient is measured or derived several times during a time period (T) including first chemical compound measurements in said first internal tract (1*);

that estimated concentration values (CB) of said second chemical compound are determined simulating its non-detected concentrations in said first internal tract of the patient;
that by detection in the first internal tract (1*) measured initial concentration values (PA) of said first chemical compound (A) are corrected by at least a compensating factor (Fc or Qx);
and that each said successive and corrected concentration value (CA) is the respective one of the compensated concentration values.

A method for compensating measured concentration values of carbon dioxide (CO2) within a gastrointestinal tract (1) of a patient, which concentration values are affected by at least nitrous oxide (N2O), which is being dosed into the respiratory gas (M) of said patient and has a limited absorption and/or diffusion and/or transport speed to a detection site of said carbon dioxide concentration measurement, rendering its measured concentration values (PCO2) to deviate from actual concentration values, characterised in that concentration values (EN2O) of at least nitrous oxide are measured or derived several times in the inhaled or exhaled gas (M) of said patient during a period (T) of a clinical operation;

that concentration values (CN2O) for nitrous oxide within the gastrointestinal tract are estimated without detection;
that the measured initial concentration values (PCO2[n]) of carbon dioxide in the gastrointestinal tract are corrected by a compensating factor (Fc);
and that each said successive and corrected concentration value (CCO2[n]) is displayed as final compensated concentration values.

Dependencies are inferred from the claim text.

Compensation of concentration values concerning a patient

Life of this patent

Compensation of concentration values concerning a patient

Life of this patent

Abstract

Claims22