US5330634A
Expired / Lapsed
US
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Calibration solutions useful for analyses of biological fluids and methods employing same
Assignee: Segars California Partners LP
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Filing: 1992-08-28
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Granted: 1994-07-19
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Expires: 2012-08-28
Abstract
Abstract Novel calibration solutions are provided which are useful, for example, with sensor assemblies used for analysis of CO 2 , especially in combination infusion fluid delivery/blood chemistry analysis systems which include a sensor assembly with each of the assembly electrodes mounted in an electrode cavity in the assembly. The analysis system used in the practice of the present invention typically includes provision for delivering infusion fluid and measuring blood chemistry during reinfusion of the physiological fluid at approximately the same flow rates. The invention calibration solutions are useful for calibrating an array of sensors capable of simultaneously measuring a number of blood chemistry parameters, including the partial pressures (tensions) of carbon dioxide and oxygen, pH (hydrogen ion), sodium, potassium, ionized calcium, ionized magnesium, chloride, glucose, lactate and hematocrit, in body fluids. More particularly, this invention relates to the use of an infusible intravenous solution to facilitate calibration on a regular basis for every individual sensor in a sensor assembly, which is in constant fluid communication with the body regardless of whether the sensors are ex vivo or in vivo.
Inventors
- 👤 David K. Wong
- 👤 Kenneth M. Curry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:32
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1468; A61B5/1486; A61B5/14532; A61B5/1495; G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925; G01N33/50; G01N33/84; G01N33/96; G01N2496/00; G01N2496/70; G01N2496/80
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
A method for the calibration of a sensor employed for the detection of CO 2 partial pressure in physiological fluid, said method comprising contacting a sensor assembly having: a fluid passageway and a sensor for CO 2 exposed to said fluid passageway, and means to pass physiological fluid or infusible calibrant, or physiological fluid and infusible calibrant over said sensor, with an infusion medium/calibrant comprising: non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L; and thereafter calibrating said sensor.
Claim 2
Independent Claim
100 words
A method for the calibration of a sensor employed for the detection of CO 2 partial pressure in physiological fluid, said method comprising contacting a sensor assembly having: a fluid passageway and a sensor for CO 2 exposed to said fluid passageway, and means to pass physiological fluid or infusible calibrant, or physiological fluid and infusible calibrant over said sensor, with an infusion medium/calibrant comprising: non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L; and thereafter calibrating said sensor.
Claim 3
Dependent Claim
53 words
A method according to claim 1 wherein said method further comprises the calibration of one or more additional species selected from the group consisting of Na + , K + , Ca ++ , Mg ++ , Cl - , pH, pO 2 , lactate and glucose, in addition to pCO 2 .
Claim 4
Dependent Claim
65 words
A method according to claim 2 wherein said calibration is carried out employing a multi-sensor assembly comprising a plurality of sensors which are responsive to one or more additional species selected from the group consisting of Na + , K + , Ca ++ , Mg ++ , Cl - , hydrogen ions, O 2 , lactose and glucose, in addition to CO 2 .
Claim 5
Dependent Claim
243 words
A method according to claim 1 wherein said infusion medium/calibrant is selected from: a non-buffered physiological sodium chloride-containing saline, further containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 to 100 mM/L, optionally containing one or more additional electrolytes, or a non-buffered 0.9% sodium chloride containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L, optionally containing one or more additional electrolytes, or a non-buffered Isolyte™ brand infusible injection solution containing an amount of sodium bicarbonate effective to provide concentration of HCO 3 - in the range of about 1 up to 100 mM/L, or a non-buffered PlasmaLyte™ brand infusible injection solution containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L, or a non-buffered Ringer's injection containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L, or a non-buffered Ringer's Acetate containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of 1 up to 100 mM/L, or a non-buffered Ringer's Lactate containing an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L.
Claim 6
Dependent Claim
24 words
A method according to claim 1 wherein said infusion medium/calibrant further comprises in the range of about 10 up to 10,000 mg/L of dextrose.
Claim 7
Dependent Claim
24 words
A method according to claim 1 wherein said infusion medium/calibrant further comprises in the range of about 10 up to 50,000 IU/L sodium heparin.
Claim 8
Dependent Claim
19 words
A method according to claim 1 wherein said infusion medium/calibrant further comprises one or more non-buffering pH adjusting reagents.
Claim 9
Dependent Claim
37 words
A method according to claim 1 wherein said method further comprises passing a volume of calibrant through the fluid passageway of said sensor assembly to provide contact of fresh calibrant with said sensor(s) when calibrating said sensor.
Claim 10
Dependent Claim
52 words
A method according to claim 1 wherein said method further comprises determining the time required for transport of fluid from the source container to the sensor, and correcting the calibration of said system to reflect the diffusion loss of gases to which the tubing employed for delivery of infusible fluid is permeable.
Claim 11
Dependent Claim
65 words
A method according to claim 1 wherein said method further comprises compensating for changes in the CO 2 concentration in the calibrant by monitoring any changes in the pH of the calibrant or any changes in the temperature of the calibrant, or any changes in the pH and temperature of the calibrant, and calculating the resulting pCO 2 based on the pH of the calibrant.
Claim 12
Independent Claim
114 words
A method for the assay of CO 2 partial pressure in physiological fluid, said method comprising contacting an assembly having: a fluid passageway and a sensor for CO 2 exposed to said fluid passageway, and means to pass physiological fluid or infusible calibrant, or physiological fluid and infusible calibrant over said sensor, with an infusible calibrant comprising: a non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L; and calibrating said CO 2 sensor; and thereafter contacting said assembly with said physiological fluid and measuring the CO 2 partial pressure in said physiological fluid.
Claim 13
Independent Claim
114 words
A method for the assay of CO 2 partial pressure in physiological fluid, said method comprising contacting an assembly having: a fluid passageway and a sensor for CO 2 exposed to said fluid passageway, and means to pass physiological fluid or infusible calibrant, or physiological fluid and infusible calibrant over said sensor, with an infusible calibrant comprising: a non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L; and calibrating said CO 2 sensor; and thereafter contacting said assembly with said physiological fluid and measuring the CO 2 partial pressure in said physiological fluid.
Claim 14
Dependent Claim
55 words
In a method for the assay of pCO 2 in physiological fluid employing a sensor assembly, the improvement comprising using an infusible calibrant comprising: a non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L.
Claim 15
Dependent Claim
55 words
In a method for the assay of pCO 2 in physiological fluid employing a sensor assembly, the improvement comprising using an infusible calibrant comprising: a non-buffered physiological sodium chloride-containing saline, and an amount of sodium bicarbonate effective to provide a concentration of HCO 3 - in the range of about 1 up to 100 mM/L.
Claim 16
Dependent Claim
51 words
In a combination infusion delivery system and chemical analysis system having a pCO 2 sensor, wherein physiological saline is employed as the infusion medium, the improvement comprising introducing an effective amount of sodium bicarbonate into said physiological saline to provide a CO 2 concentration adequate to calibrate said CO 2 sensor.
Claim 17
Dependent Claim
51 words
In a combination infusion delivery system and chemical analysis system having a pCO 2 sensor, wherein physiological saline is employed as the infusion medium, the improvement comprising introducing an effective amount of sodium bicarbonate into said physiological saline to provide a CO 2 concentration adequate to calibrate said CO 2 sensor.
References Cited (Backward Citations)
US5256660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-18 | 1998-01-17 | 1998-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-18 | 2002-01-17 | 2002-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-18 | 2006-01-17 | 2006-07-19 | $7700.00 | Window Closed / Lapsed |