Method for hydrating and calibrating a sterilizable fiber-optic catheter
First Claim
1. A method of equilibrating a sensor component membrane of a fiber-optic catheter useful for measuring at least one analyte other than chloride in blood to determine pH, pO2, or pCO2 in a blood sample, comprising the step of contacting the sensor component membrane with an aqueous buffer solution containing chloride at a level substantially equal to the level found in blood, for a period of time sufficient to equilibrate the sensor membrane so that an ionic gradient is prevented from forming across the sensor component membrane when the sensor component membrane is contacted with the blood sample.
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Abstract
The present invention provides an aqueous buffer solution and method and solution for hydrating and calibrating a sensor membrane of a fiber-optic catheter useful for measuring an analyte other than chloride in a physiological milieu. The temperature, gaseous atmosphere, and aqueous buffer solution of the sensor component are controlled throughout the calibration process in order to ensure that the device is calibrated in accordance with its intended use. The solution is chemically compatible with the intended use of the device and provides compensation for evaporative loss, contaminants, or changes in the solution occurring during storage especially in plastic containers.
27 Citations
12 Claims
- 1. A method of equilibrating a sensor component membrane of a fiber-optic catheter useful for measuring at least one analyte other than chloride in blood to determine pH, pO2, or pCO2 in a blood sample, comprising the step of contacting the sensor component membrane with an aqueous buffer solution containing chloride at a level substantially equal to the level found in blood, for a period of time sufficient to equilibrate the sensor membrane so that an ionic gradient is prevented from forming across the sensor component membrane when the sensor component membrane is contacted with the blood sample.
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4. A method of equilibrating and calibrating a sensor component membrane and monitoring instrumentation of a fiber-optic catheter useful for measuring at least one analyte other than chloride in a blood sample comprising the steps of:
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contacting the sensor component membrane with a first aliquot of an aqueous buffer solution containing chloride at a level substantially equal to the level found in said blood, for a period of time sufficient to equilibrate said sensor component membrane so that an ionic gradient is prevented from forming across the sensor component membrane when the sensor component membrane is contacted with a blood sample; exposing a second aliquot of the aqueous buffer solution to a controlled gaseous atmosphere to achieve a controlled calibration point value; contacting the sensor component membrane with the second aliquot of the aqueous buffer solution at the controlled calibration point value; and
,contacting the sensor component membrane with the blood sample and determining that an ionic gradient does not form across the sensor component membrane. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A method of equilibrating and calibrating a sensor component membrane and monitoring instrumentation of a fiber optic catheter useful for measuring at least one analyte other than chloride in blood, comprising the steps of:
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contacting the sensor component membrane with an aqueous buffer solution containing chloride at a level substantially equal to the level found in said blood, for a period of time sufficient to equilibrate said sensor component membrane so that an ionic gradient is prevented from forming across the sensor component membrane when the sensor component membrane is contacted with a blood sample; and exposing the aqueous buffer solution and sensor component membrane to a controlled gaseous atmosphere under conditions sufficient to achieve a controlled calibration point value.
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Specification