Method and apparatus for automatically determining the dilution curve of a solution, particularly the oxygen dissociation curve of blood or hemoglobin solutions
First Claim
1. A method for automatically determining the oxygen dissociation curve of whole blood or of hemoglobin solution, comprising the steps of continuously admixing a first sample of blood or hemoglobin solution containing oxygen at a known predetermined saturation level with a second sample of blood or hemoglobin solution at a different saturation level, continuously measuring the oxygen dissolved in the mixture, converting said measurement into an electrical signal, comparing said signal with reference values related to the said blood or hemoglobin solution having the predetermined saturation level, measuring the partial pressure of oxygen dissolved in the mixture and calculating the functions S = f (Po) and Total O = f'"'"' (Po) according to the equations:
- ##EQU5## in which;
Vo is the known volume of solution having said predetermined saturation level of oxygen,So is the value of S calculated for the volume Vo,C is the capacity of the solvent towards oxygen,α
is the solubility coefficient of blood or hemoglobin solutions,Po is the partial pressure of oxygen in the known volume Vo,Va is the volume of the sample added and mixed with Vo at a time t,P is the partial pressure of oxygen in the mixture at the time t,Sa is the value of S for the mixture at the time t, the calculation being carried out in real time with respect to the mixing,anddetermining said dilution curve from the calculations.
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Abstract
The invention relates to an apparatus for automatically determining the oxygen dissociation curve (ODC) of whole blood or of a hemoglobin solution. Blood or hemoglobin having a predetermined oxygen saturation level are admixed with deoxygenated blood or a hemoglobin solution and the oxygen partial pressure of the mixture, while being formed, is measured. The output of the PO.sbsb.2 electrode, in the form of an electrical signal, is fed into a computer and two functions of the PO.sbsb.2 (saturation and total oxygen) are calculated, giving the required curve by means of recording and/or displaying means. In this way, the ODC can be determined for whole blood under near physiological conditions of pH, hemoglobin concentration, hematocrit, temperature, PCO.sbsb.2, and organic phosphates content.
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Citations
9 Claims
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1. A method for automatically determining the oxygen dissociation curve of whole blood or of hemoglobin solution, comprising the steps of continuously admixing a first sample of blood or hemoglobin solution containing oxygen at a known predetermined saturation level with a second sample of blood or hemoglobin solution at a different saturation level, continuously measuring the oxygen dissolved in the mixture, converting said measurement into an electrical signal, comparing said signal with reference values related to the said blood or hemoglobin solution having the predetermined saturation level, measuring the partial pressure of oxygen dissolved in the mixture and calculating the functions S = f (Po) and Total O = f'"'"' (Po) according to the equations:
- ##EQU5## in which;
Vo is the known volume of solution having said predetermined saturation level of oxygen,So is the value of S calculated for the volume Vo, C is the capacity of the solvent towards oxygen, α
is the solubility coefficient of blood or hemoglobin solutions,Po is the partial pressure of oxygen in the known volume Vo, Va is the volume of the sample added and mixed with Vo at a time t, P is the partial pressure of oxygen in the mixture at the time t, Sa is the value of S for the mixture at the time t, the calculation being carried out in real time with respect to the mixing, and determining said dilution curve from the calculations. - View Dependent Claims (2, 3, 4, 5, 6)
- ##EQU5## in which;
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7. An apparatus for automatically determining the oxygen dissociation curve of the whole blood or of hemoglobin solutions, comprising:
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a thermostated mixing and measuring chamber, first dosing means for feeding to the said chamber blood saturated with oxygen at a predetermined level; second dosing means for feeding to the said chamber deoxygenated blood;
means for measuring the partial pressure of the oxygen on the mixture which is formed in said chamber and converting the measurement into an electrical signal;
an analogic computer, for receiving said signal and containing basic or reference data related to the oxygenated blood for calculating, in real time with respect to the mixing, the functions S = f (PO.sbsb.2) and Total O2 = f" (PO.sbsb.2), and recording means for recording the calculated values of the two above said functions. - View Dependent Claims (8, 9)
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Specification