Method and device for measuring blood gas parameters

• US 7,491,175 B2
• Filed: 05/30/2003
• Issued: 02/17/2009
• Est. Priority Date: 05/31/2002
• Status: Expired due to Fees

• Current Assignee: Roche Diagnostics Operations Incorporated (Roche Holding AG)
• Original Assignee: Roche Diagnostics Operations Incorporated (Roche Holding AG)
• Inventors: Ruether, Horst, Huemer, Herfried
• Primary Examiner(s): Nasser; Robert L
• Application Number:
  US10/449,420
• Publication Number:
  US 20030225341A1
• Time in Patent Office: 2,090 Days
• Field of Search: 600/549, 600/364, 73/10.2, 436 66- 68, 435/283.1, 435/287, 422/50, 422/68.1, 422/82.12, 422/83, 422/99
• US Class Current: 600/549
• CPC Class Codes: A61B 5/0008 Temperature signals
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Abstract

The invention relates to a method and device for measuring blood gas parameters, preferably pH, pCO₂, and pO₂, in a blood sample, where the blood sample of a patient is fed into at least one measuring cell of an analyzer. In order to obtain accurate values for the blood gas parameters even in cases where the temperature of the patient deviates from normal temperature, the temperature of the patient or blood sample is measured upon sample withdrawal, and the measured temperature is transmitted to the analyzer or is recorded by the analyzer, and the temperature of the measuring cell of the analyzer is adjusted to the measured temperature by cooling or heating.

Claims

1. A method for measuring blood gas parameters in a blood sample from a patient, comprising:

measuring the temperature of the patient or the temperature of the blood sample upon sample withdrawal,

feeding the blood sample into at least one measuring cell of an analyzer for measuring blood gas parameters,

transmitting the measured temperature to the analyzer,

adjusting the temperature of the at least one measuring cell of the analyzer to the measured temperature, wherein the analyzer enables entry of the sample only after the measuring cell is adjusted to the measured temperature, and

measuring a blood gas parameter.

2. The method according to claim 1, wherein the measuring cell is adjusted to the measured temperature before the blood sample is entered into the analyzer.

3. The method according to claim 1, wherein the patient temperature is measured by a temperature probe adapted to be capable of being placed in or on the patient.

4. The method according to claim 3 wherein the temperature data are transmitted automatically to the analyzer.

5. The method according to claim 1, wherein the temperature of the measuring cell of the analyzer is adjusted between 22°

C. to 40°

C.

6. A method according to claim 1, wherein the transmission of the measured temperature to the analyzer is performed via cable, via IF signal, or via RF signal.

7. A method according to claim 1, wherein the measured blood gas parameter is at least one of pH, pCO₂ , and pO₂.

8. A method for measuring blood gas parameters in a blood sample from a patient, comprising:

measuring the temperature of the patient or the temperature of the blood sample upon sample withdrawal,

feeding the blood sample into at least one measuring cell of an analyzer for measuring blood gas parameters,

transmitting the measured temperature to the analyzer,

adjusting the temperature of the at least one measuring cell of the analyzer to the measured temperature, wherein the temperature of the patient is continuously measured and the temperature of the measuring cell is continuaVy adjusted synchronously with the temperature of the patient, and

measuring a blood gas parameter.

9. The method according to claim 8, wherein the measuring cell is adjusted to the measured temperature before the blood sample is entered into the analyzer.

10. The method according to claim 8, wherein the patient temperature is measured by a temperature probe adapted to be capable of being placed in or on the patient.

11. The method according to claim 8, wherein the temperature data are transmitted automatically to the analyzer.

12. The method according to claim 8, wherein the temperature of the measuring cell of the analyzer is adjusted between 22°

C. to 40°

C.

13. The method according to claim 8, wherein the transmission of the measured temperature to the analyzer is performed via cable, via IF signal, or via RF signal.

14. The method according to claim 8, wherein the measured blood gas parameter is at least one of pH, PCO₂, and PO₂.

15. A method for measuring blood gas parameters in a blood sample from a patient, comprising:

providing an analyzer including at least one measuring cell,

adjusting the temperature of the sample to the temperature of the patient or the temperature of the blood sample upon sample withdrawal, wherein the analyzer enables entry of the blood sample only upon the measuring cell reaching the temperature of the patient or sample, and

measuring a blood gas parameter.

16. The method of claim 15 wherein the blood sample is placed into at least one measuring cell.

17. The method of claim 15 wherein the temperature of the patient or sample is transmitted to the analyzer.