CA1187386A - Fiber optic p ino2 xx probe - Google Patents
Fiber optic p ino2 xx probeInfo
- Publication number
- CA1187386A CA1187386A CA000417127A CA417127A CA1187386A CA 1187386 A CA1187386 A CA 1187386A CA 000417127 A CA000417127 A CA 000417127A CA 417127 A CA417127 A CA 417127A CA 1187386 A CA1187386 A CA 1187386A
- Authority
- CA
- Canada
- Prior art keywords
- dye
- porous
- probe according
- oxygen
- jacket
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/1459—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters invasive, e.g. introduced into the body by a catheter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N2021/6484—Optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/7703—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator using reagent-clad optical fibres or optical waveguides
- G01N2021/7706—Reagent provision
- G01N2021/772—Tip coated light guide
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7769—Measurement method of reaction-produced change in sensor
- G01N2021/7786—Fluorescence
Abstract
ABSTRACT OF THE DISCLOSURE
A fiber optic probe to be implanted in human body tissue for physiologic studies involving measure-ment and monitoring of the partial pressure of gaseous oxygen in the blood stream, which is coursing through a particular blood vessel in the body. The use of the probe is based on the principle of dye fluorescence oxygen quenching. Structurally the probe comprises two 150-micrometer strands of plastic optical fiber ending in a section of porous polymer tubing serving as a jacket or envelope for the fibers. The tubing is packed with a suitable fluorescent light-excitable dye placed on a porous adsorptive particulate polymeric support. The tubing or jacket is usually made of a hydrophobic, gas-permeable commercial material, known as Celgard, but other suitable hydrophobic gas-permeable material could be used for such structure. The fiber optic probe of the invention is of very small size and flexible so that it can easily be threaded through small blood vessels which are located in a variety of tissues of the body.
A fiber optic probe to be implanted in human body tissue for physiologic studies involving measure-ment and monitoring of the partial pressure of gaseous oxygen in the blood stream, which is coursing through a particular blood vessel in the body. The use of the probe is based on the principle of dye fluorescence oxygen quenching. Structurally the probe comprises two 150-micrometer strands of plastic optical fiber ending in a section of porous polymer tubing serving as a jacket or envelope for the fibers. The tubing is packed with a suitable fluorescent light-excitable dye placed on a porous adsorptive particulate polymeric support. The tubing or jacket is usually made of a hydrophobic, gas-permeable commercial material, known as Celgard, but other suitable hydrophobic gas-permeable material could be used for such structure. The fiber optic probe of the invention is of very small size and flexible so that it can easily be threaded through small blood vessels which are located in a variety of tissues of the body.
Description
73~6 FIBER OPTIC Po2 PROBE
~I~Ln 0~ ~r 1~V~5-0~
The present invention relates to measurement of oxygen partial pressure, and more particularly to a fiber optic probe device for implantation to ~easure oxygen partial pressure in the blood or tissue.
BACRGROUND OF THE I~NTION
Physiologic oxygen measurement is important for many reasons, as follows:
3~
- The transfer ~unction (Figure 1) is the ~undamental determinant of oxygen transport and distribution.
- Adsorption f 2 by heme is the most widely used mechanism of oxygen storage and transport throughout the animal kingdom.
- The corresponding protein change (globin) embedding the heme controls its adsorptive charac-teristic~, and determines the shape of the transfer function, thus suiting the heme to the needs of a particular species.
- The globin chain also is part of a control loop to adjust the curve to biochemical signals, most significantly pH, 2,3-diphosphoglycerate and CO2.
- In people, approximately 200 genetic variants of hemoglobin are known; most are innocuous, some are pathologically severe because of alteration of the transfer function (sickle cell disease, etc.).
- Direct measurement of Po2 is therefore necessary to observe the oxygen transport behavior in an individual in any physiologic investigation.
Moreover, adequate tissue oxygenation is one of the most important short-range concerns in a variety of surgical and intensive care situations, requiring either quick response sampling or continuous monitoring of Po2 levels.
A number of techniques and systems are known, but none of these i5 entirely suitable. For example:
- The Clark electrode (membrane-dlffusion, amperometric) does not lend itselE to small size.
7~J~;i ~ 3 - ~he ~iff~sion deDendence is subject to calibration and drift problems.
- A strictly potentiometric (redox) electrode has specificity Aifficulties.
Haase, USP 4,201,222 discloses an optical catheter, including a fiber optic bundle, adapted to be inserted into a blood vessel oE a living body for measuring the partial press~re oE oxygen gas in the blood stream. The catheter comprises a semi-permeable wall member for excluding the entry therethrough of blood liquid while permitting passage of blood gases.
The intensity of a reflected visible light beam entering the optical fiber bundle, when compared to the intensity of the incident beam, is said to accurately correspond to the partial pressure of ~he oxygen gas in the bloodstream.
Mori, USP 3,814,081 discloses an optical catheter for measuring the percentage content of oxygen saturating the blood stream of a living animal body. An illuminating fiber optic system and a light receiving system are arranged closely adjacent to one another. The tip of the catheter is inserted into a blood-carrying organ of the animal body. The degree of oxygen saturation is measured by a light ahsorption spectroscopic determination of light waves which are reflected from the blood stream and received by an optical fiber bundle.
Ostrowski et al USP 3,807 r 390 disclose a fiber optic catheter for monitoring blood oxygen saturation in a human blood stream, in vivo, by insertion of the catheter tip into the cardiovascular system of the living body.
3~1~
~ lillis et al USP 4,033,330 is of general interest in showing a transcutaneous optical pH
measuring device ~or determining blood pH or carbon dioxide concentraton in the blood. Fostick USP
4,041,932 is likewise of general interest in teaching an apparatus usecl to measure and monitor the concentration and partial pressure of gases, such as oxygen and carbon dioxide in arterial blood vessels, and the pH of the blood during various time periods.
The Po2 electrode literature is enormous, but there is still not a suitable electrode available.
Oxygen measurement by luminescence quenching has also been suggested~ The idea originated in the 1930's, but has had relatively little use, although oxygen quenching of fluorescence ls widely recognized as a nuisance. Stevens USP 3,612,866 discloses an apparatus for measuring the oxygen content concentration of liquids or gases based on the molecular luminescence quenching effect of gaseous oxygen on aromatic molecules, derivatives of s~ch aromatics and aliphatic ketones.
Other applications of luminescence quenching for oxygen determination include:
1. Original observation of effect - dyes adsorbed on silica gel: H. Kautsky and A. Hirsch in early 1930's, e.g. H. Kautsky and A. Hirsch, Z. fur anorg. u. allgem~ Chemie 222, 126-34, 1935.
~I~Ln 0~ ~r 1~V~5-0~
The present invention relates to measurement of oxygen partial pressure, and more particularly to a fiber optic probe device for implantation to ~easure oxygen partial pressure in the blood or tissue.
BACRGROUND OF THE I~NTION
Physiologic oxygen measurement is important for many reasons, as follows:
3~
- The transfer ~unction (Figure 1) is the ~undamental determinant of oxygen transport and distribution.
- Adsorption f 2 by heme is the most widely used mechanism of oxygen storage and transport throughout the animal kingdom.
- The corresponding protein change (globin) embedding the heme controls its adsorptive charac-teristic~, and determines the shape of the transfer function, thus suiting the heme to the needs of a particular species.
- The globin chain also is part of a control loop to adjust the curve to biochemical signals, most significantly pH, 2,3-diphosphoglycerate and CO2.
- In people, approximately 200 genetic variants of hemoglobin are known; most are innocuous, some are pathologically severe because of alteration of the transfer function (sickle cell disease, etc.).
- Direct measurement of Po2 is therefore necessary to observe the oxygen transport behavior in an individual in any physiologic investigation.
Moreover, adequate tissue oxygenation is one of the most important short-range concerns in a variety of surgical and intensive care situations, requiring either quick response sampling or continuous monitoring of Po2 levels.
A number of techniques and systems are known, but none of these i5 entirely suitable. For example:
- The Clark electrode (membrane-dlffusion, amperometric) does not lend itselE to small size.
7~J~;i ~ 3 - ~he ~iff~sion deDendence is subject to calibration and drift problems.
- A strictly potentiometric (redox) electrode has specificity Aifficulties.
Haase, USP 4,201,222 discloses an optical catheter, including a fiber optic bundle, adapted to be inserted into a blood vessel oE a living body for measuring the partial press~re oE oxygen gas in the blood stream. The catheter comprises a semi-permeable wall member for excluding the entry therethrough of blood liquid while permitting passage of blood gases.
The intensity of a reflected visible light beam entering the optical fiber bundle, when compared to the intensity of the incident beam, is said to accurately correspond to the partial pressure of ~he oxygen gas in the bloodstream.
Mori, USP 3,814,081 discloses an optical catheter for measuring the percentage content of oxygen saturating the blood stream of a living animal body. An illuminating fiber optic system and a light receiving system are arranged closely adjacent to one another. The tip of the catheter is inserted into a blood-carrying organ of the animal body. The degree of oxygen saturation is measured by a light ahsorption spectroscopic determination of light waves which are reflected from the blood stream and received by an optical fiber bundle.
Ostrowski et al USP 3,807 r 390 disclose a fiber optic catheter for monitoring blood oxygen saturation in a human blood stream, in vivo, by insertion of the catheter tip into the cardiovascular system of the living body.
3~1~
~ lillis et al USP 4,033,330 is of general interest in showing a transcutaneous optical pH
measuring device ~or determining blood pH or carbon dioxide concentraton in the blood. Fostick USP
4,041,932 is likewise of general interest in teaching an apparatus usecl to measure and monitor the concentration and partial pressure of gases, such as oxygen and carbon dioxide in arterial blood vessels, and the pH of the blood during various time periods.
The Po2 electrode literature is enormous, but there is still not a suitable electrode available.
Oxygen measurement by luminescence quenching has also been suggested~ The idea originated in the 1930's, but has had relatively little use, although oxygen quenching of fluorescence ls widely recognized as a nuisance. Stevens USP 3,612,866 discloses an apparatus for measuring the oxygen content concentration of liquids or gases based on the molecular luminescence quenching effect of gaseous oxygen on aromatic molecules, derivatives of s~ch aromatics and aliphatic ketones.
Other applications of luminescence quenching for oxygen determination include:
1. Original observation of effect - dyes adsorbed on silica gel: H. Kautsky and A. Hirsch in early 1930's, e.g. H. Kautsky and A. Hirsch, Z. fur anorg. u. allgem~ Chemie 222, 126-34, 1935.
2. ~easurement of 2 produced by illumination of algae: M. Pollack, P. Pringsheim and D. Terwood, J. Chem. Phys., 12, 295-9, 1944.
7~
7~
3. Catalog of oxygen quenching sensitivities of organic molecules of scintillation interest: I.B. Berlman, "Handbook of Fluorescence Spectra of Aromatic ~olecules", Academic Press, 1965.
4. 2 measured down to 10 5 torr ~ith acriflavin on acrylic s.heet: Gy. Orban, Zs.
Szentirmay and J. Patko, Proc. of the Intl. Conf. on Luminescence, 1966, v.l, 611-3, 19~8.
Szentirmay and J. Patko, Proc. of the Intl. Conf. on Luminescence, 1966, v.l, 611-3, 19~8.
5. Diffusion coefficient f 2 in acrylics measured by observing the phosphorescence of rodso G. Shaw, Trans. Faraday Soc. 63, 2181-9, 1967.
6. 2 permeability of acrylic films measured by quench rate vs. Po2 : P.F. Jones, Polymer Letters 6, 487-91, 1968.
7. PO measuring instrument based on fluoranthene adsorbed on plastic films and porous vycor: I. Bergman, Nature 218, 396, 1968~
8. Pyrenebutyric acid used as probe for measuring intracellular 2 J.A. Knopp and I.A.
Longmuir, Biochimica et Biophysica Acta, 279, 393-7, 1972.
Longmuir, Biochimica et Biophysica Acta, 279, 393-7, 1972.
9. Physiological Po2 measurement using DMF
solutions of pyrenebutyric acid ~n various membrane-enclosed ~orms, D.W. Lubber and N. Opitz, Z. Naturf.
30c, 532-3, 1975.
SUMMARY OF THE INVENTION
It would be advantageous to have improved PO
in vivo measurements.
It would also be advantageous to have an improved PO measurement device, particularly one based on oxy~en measurement using luminescence quenching and includiny a fiber optic probe.
~r~
.
73~
It would fu~ther ~e adva~tageous to have an impro~ed PO measurement devic~ employ~ng lumi~escence quenching as i~s operational p~inciple and utilizing a fiber optic probe in combination with a relatively simple optical system in association with photomultiplier tubes and an electronic computing circuit driven by said photomultiplier tubes and arranged to provide a direct analog computation of PO based on said luminescence quenching as detected by said optical system.
The present invention, in particular, provides a probe for determining PO in the blood or tissue of a living animal, comprising: an oxygen-porous ~acket of a size sufficiently small to be passed into a blood vessel;
a porous dye support carried within said jacket and having high permeability to expose individual dye molecules carried thereby to oxygen collision; a non-to~ic dye carried by said porous dye support, said dye being visibly luminescent, having stability to light and aging, and being oxygen quenching-sensitive; and fiber optic means to pass excitation light to said dye within said jacket and collect luminescence therefrom.
A typical fiber optic probe for measuring oxygen partial pressure according to the present invention, based on the principle of fluorescence quenching, comprises two 150-micrometer strands of plastic optical fiber ending in a section of porous polymer tubing about 5 mm long and 0.6 mm in diameter. The tubing is packed with a d~e on an adsorp-tive particulate support. The general construction is similar to a physiological p~l probe which has previously been described in the Peterson et al USP 4,200,110.
Development of the probe of the present invention required the solution of three major problems not encountered before in the application of the above-mentioned quenching principle:
7~
l. A dye had to be ~ound with the combined properties o~ suitable oxygen quench sensitivity (long activated state lifetime), fluorescence excitation by visible light, and resistance to fading. Plastic ~ptical fibers which transmit light sufficiently at wavelengths shorter than 450 nm are not available.
rJltravio]et transmitting inorganic fibers are not desirahle for this application because of their brittleness.
2. A suitable hydrophobic, high-oxygen permeability envelope was necessaryO
3. An adsorptive support was required which activated the dye without sensitivity to humidity.
The traditional silica dye support is not suitable for use in an aqueous medium.
~ he probe device of the present invention is intended to provide a small-size, low-cost probe suitable for tissue and blood vessel implantation through a hypodermic needle.
Fiber optic probes have substantial advantages, including the following:
` a~ Very small size is possible, such as less than 0.5 mm ~
b. They are flexible, so that they can be threaded through small blood vessels or can be located in a variety of tissues.
c. They are low in cost, disposable, and easy to fabricate.
d. They introduce no electrical hazard.
e. They are suitable for equilibrium measurement, rather than dynamic.
73~
The s~;ectionof luminescence quenching as the mechanism for oxygen measurement was based on the ~ollowing factors:
1. A reversible indicator is needed for a PO probe. A reversible colorimetric (absorbance) indicator for oxygen is not avai]able. The transition ~etal complex oxygen absorbers do not have the required stability 20 Aromatic molecules form charge-transfer complexes with oxygen upon activation by light absorption. This provides a mechanism for deactivation of the fluorescent state which is specific for oxygen.
high energy of activation of the molecule, sufEicient to achieve formation of activated oxygen by collision transfer, is not needed, i.e., the quenching phenomenon can be observed with visible light activation of luminescence.
Fluorescence (and phosphorescence) quenching is the result of a non-luminescent decay mode competing with the luminescent decay of an activated molecule, thereby decreasing the mean lifetime of the activated state and decreasing the luminous intensity (see Figure 2).
With constant illumination, the rate of decay of the excited state is the sum oE the rates of the various decay modes; the collision decay rate is proportional to the activated state mean lifetime (approximately, the fluorescence lifetime) and the collision rate, which is in turn proportional to the pressure of the quench gas. These competing decay rates result in the Stern-Volmer relation for intensity I and pressure Po2 of oxygen:
Io ~ 1 ~ 2 p, (OO Stern and ~. Volmer, Physikalische ZeitschLift ~, 183-8, 1919), where Io is the intensity without quenching and P' is a constant, the pressure at half-quench. The constant includes a proportionality of corresponding quench to mean fluorescence lifetime, so the same expresslon can be written in terms of observed luminescent lifetimes, To and T:
To 2 + 1 +
T P' Good sensitivity to quenching requires a long mean lifetime of the excited state.
Phosphorescence, with a very long lifetime (seconds), is very sensitive to quenching, but is weakin intensity. Fluorescence is less sensitive to quenching, but has a high brightness (high quantum efficiency). P' should be of the order of the pressure to be measured to best compromise brightness and sensitivity (see Figure 3).
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects and advantages of the invention will become apparent from the Eollowing description and claims, and from the accompanying drawings, wherein:
Figure 1 is a graph showing the classic concentration vs. pressure relationship of oxygen in human blood.
73~
solutions of pyrenebutyric acid ~n various membrane-enclosed ~orms, D.W. Lubber and N. Opitz, Z. Naturf.
30c, 532-3, 1975.
SUMMARY OF THE INVENTION
It would be advantageous to have improved PO
in vivo measurements.
It would also be advantageous to have an improved PO measurement device, particularly one based on oxy~en measurement using luminescence quenching and includiny a fiber optic probe.
~r~
.
73~
It would fu~ther ~e adva~tageous to have an impro~ed PO measurement devic~ employ~ng lumi~escence quenching as i~s operational p~inciple and utilizing a fiber optic probe in combination with a relatively simple optical system in association with photomultiplier tubes and an electronic computing circuit driven by said photomultiplier tubes and arranged to provide a direct analog computation of PO based on said luminescence quenching as detected by said optical system.
The present invention, in particular, provides a probe for determining PO in the blood or tissue of a living animal, comprising: an oxygen-porous ~acket of a size sufficiently small to be passed into a blood vessel;
a porous dye support carried within said jacket and having high permeability to expose individual dye molecules carried thereby to oxygen collision; a non-to~ic dye carried by said porous dye support, said dye being visibly luminescent, having stability to light and aging, and being oxygen quenching-sensitive; and fiber optic means to pass excitation light to said dye within said jacket and collect luminescence therefrom.
A typical fiber optic probe for measuring oxygen partial pressure according to the present invention, based on the principle of fluorescence quenching, comprises two 150-micrometer strands of plastic optical fiber ending in a section of porous polymer tubing about 5 mm long and 0.6 mm in diameter. The tubing is packed with a d~e on an adsorp-tive particulate support. The general construction is similar to a physiological p~l probe which has previously been described in the Peterson et al USP 4,200,110.
Development of the probe of the present invention required the solution of three major problems not encountered before in the application of the above-mentioned quenching principle:
7~
l. A dye had to be ~ound with the combined properties o~ suitable oxygen quench sensitivity (long activated state lifetime), fluorescence excitation by visible light, and resistance to fading. Plastic ~ptical fibers which transmit light sufficiently at wavelengths shorter than 450 nm are not available.
rJltravio]et transmitting inorganic fibers are not desirahle for this application because of their brittleness.
2. A suitable hydrophobic, high-oxygen permeability envelope was necessaryO
3. An adsorptive support was required which activated the dye without sensitivity to humidity.
The traditional silica dye support is not suitable for use in an aqueous medium.
~ he probe device of the present invention is intended to provide a small-size, low-cost probe suitable for tissue and blood vessel implantation through a hypodermic needle.
Fiber optic probes have substantial advantages, including the following:
` a~ Very small size is possible, such as less than 0.5 mm ~
b. They are flexible, so that they can be threaded through small blood vessels or can be located in a variety of tissues.
c. They are low in cost, disposable, and easy to fabricate.
d. They introduce no electrical hazard.
e. They are suitable for equilibrium measurement, rather than dynamic.
73~
The s~;ectionof luminescence quenching as the mechanism for oxygen measurement was based on the ~ollowing factors:
1. A reversible indicator is needed for a PO probe. A reversible colorimetric (absorbance) indicator for oxygen is not avai]able. The transition ~etal complex oxygen absorbers do not have the required stability 20 Aromatic molecules form charge-transfer complexes with oxygen upon activation by light absorption. This provides a mechanism for deactivation of the fluorescent state which is specific for oxygen.
high energy of activation of the molecule, sufEicient to achieve formation of activated oxygen by collision transfer, is not needed, i.e., the quenching phenomenon can be observed with visible light activation of luminescence.
Fluorescence (and phosphorescence) quenching is the result of a non-luminescent decay mode competing with the luminescent decay of an activated molecule, thereby decreasing the mean lifetime of the activated state and decreasing the luminous intensity (see Figure 2).
With constant illumination, the rate of decay of the excited state is the sum oE the rates of the various decay modes; the collision decay rate is proportional to the activated state mean lifetime (approximately, the fluorescence lifetime) and the collision rate, which is in turn proportional to the pressure of the quench gas. These competing decay rates result in the Stern-Volmer relation for intensity I and pressure Po2 of oxygen:
Io ~ 1 ~ 2 p, (OO Stern and ~. Volmer, Physikalische ZeitschLift ~, 183-8, 1919), where Io is the intensity without quenching and P' is a constant, the pressure at half-quench. The constant includes a proportionality of corresponding quench to mean fluorescence lifetime, so the same expresslon can be written in terms of observed luminescent lifetimes, To and T:
To 2 + 1 +
T P' Good sensitivity to quenching requires a long mean lifetime of the excited state.
Phosphorescence, with a very long lifetime (seconds), is very sensitive to quenching, but is weakin intensity. Fluorescence is less sensitive to quenching, but has a high brightness (high quantum efficiency). P' should be of the order of the pressure to be measured to best compromise brightness and sensitivity (see Figure 3).
BRIEF DESCRIPTION OF THE DRAWINGS
Further objects and advantages of the invention will become apparent from the Eollowing description and claims, and from the accompanying drawings, wherein:
Figure 1 is a graph showing the classic concentration vs. pressure relationship of oxygen in human blood.
73~
- 10 ~
Figure 2 is a schematic representation o~
competing modes of deactivation o~ an optically excited molecule.
Figure 3 is a schematic representation showing the relationship between P' and P~ .
Figure 4 is a diaqr~mmatic view of an embodiment of a PO probe in accordance ~ith the present invention.
Figure 5 is a graph comparing theoretical Stern-Volmer data with typically observed data according to the invention.
Figures 6 and 7 respectively show schematically the optical system and the electronic computing system of a simple analog instrument employing testing probes according to the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to the drawings, and more particularly to Figure 4, a Po2 probe according to the present invention is generally designated at 8. The pO probe 8 is modelled after the pH probe previously developed by use (see Peterson et al, USP 4,200,110).
In the Po2 probe 8, the dye lS on an adsorbent support 16, is contained inside a section of tubing 10 of porous polyethylene, providing rapid equilibration with the surrounding oxygen and isolating the dye~
packing 16 from contamination. The tubing 10 is 73~i closed at one end, providing an axial tapered closure tip 9. A pair o~ ~lexi~le plastic o~tical fibers 12 and 14, for example, 150-micrometer strands of plastic optical fiber, are suitably secured in the other end o~ the tubing lO, with their ends optically exposed to the d~e 15 in the packing 16. The tubing lO may cornprise a section of porous polymer tubing about 5 mm long and 0.6 mm in diameter.
Blue light illumination passes down one optical fiber 12 to excite the dye 15 to fluorescence.
The green fluorescent light, along with scattered blue light, enters the other fiber 14 and passes to a measuring instrument (see Figures 6 and 7). The blue light intensity Io is used as the reference for optical compensation, and the green light intensity I
is a measure of the oxygen quenching.
The Stern-Volmer relation provides a linear quantitative basis for measuring Po2 by quenching Isee Figure 5). A curved relation is commonly observed (the literature with Stern-Volmer plotted data is large) and an exponent is often attached to the oxygen pressure to ~it the data to the equation.
A theoretical interpretation of the exponential relation is dlfficult to understand;
curved data can be equally well fitted by an offset constant on the intensity measurements, which can be explained as instrumental background or non-quenchable luminescence. For instrumental design purposes, however, using either an exponent m on the intensity ratio or an exponent n as the bracketed difference is more practical:
Po2 = p A simple analog instrument was constructed (see Figures 6 and 7) for evaluation of the probes.
Measurement of Po2 to the nearest ImmHg Po2 requi better than 0.1% intensity measurement error.
Instrumentally, the limiting factor is light source stability.
As noted above, there are three features of the above-described system which need to be properly selected, namely, the dye 15, the dye support 16 and the envelope 10.
A suitable dye 15 has the following characteristics:
a. It must be capable of excitation by and generation of visible wavelengths which can be transmitted by plastic optical fibers of a type which is unbreakable when subjected to sharp bends, is highly flexible, and which can be formed to provide easy optical coupling, such as with flared ends.
b. It must be stable to light and have adequate resistance to aging.
c. It must be non-toxic.
d. It must have sufficient oxygen quenching sensitivity (long mean lifetime of the excited state) as needed to attain measurement to the nearest l mmHg Po2 .
There is a problem in the selection of the dye lS in that many UV-excited dyes have a high quench sensitivity (benzene has one of the highest), but the requirement of visible light excitation makes it much more difficult to find a dye which will meet the requirement. A suitable dye i5 perylene dibutyrate.
~L~.,t3?73~
~nother suitable dye is Pylam Products LX7878~ Less suitable; but usable dyes are Terasil ~rilliant Flavine 8GFF; Nylosan Brilliant Flavine; Acridine Yellow; Brilliant Sulfaflavine; 2~7-dichloro-fluorescein; Acridine Orange; Coumarin 34; Coumarin 6;
sodium ~luorescein (Auranine), and some rhodamines.
~thers have appeared in the literature references given herein.
With regard to a suitable support 16, ~he quenching effect was classically observed on silica gel, and high sensitivity is achie~ed on this support.
A high-permeability support is necessary to expose the individual dye molecules to oxygen collision. A
solution of the dye in liquids or $olids is insen-sitive because of the low oxygen permeability of such materials.
The problem with inorganic adsorbents is that the ~uenching is humidity-sensitive; quenching and/or fluorescence is destroyed at 100% humidity, the condition of physiologic measurement.
Organic adsorbents, such as porous polymers, avoid the humidity problem, with a sacri~ice of quench sensitivity and these polymers determinable by routine testing in view of this disclosure, are desirably selected. A porous polymer, Rohm & Haas "Amberlite XAD4", a non-ionic hydrophobic polymer, is the preferred support 16. Examples of others are Gas Chrom Q, Amberlite XAD2, XAD8; Dow XFS4022;
Johns-Manville Chromosorb, Nos. 101, 102, 103, 104, 105, 106, 107, 108; Waters Porapak Nos. N, P, PS, Q, R, S, QS, T; Hamilton Co. PRP-l.
'73~1i In the ill~strated embodiment of the PO
probe 8, a liquid-water-i~permeable container of high oxygen permeabilit~ is required ~or the permeable envelope 10. Porous polypropylene sheet Celanese "Celgard", heat-sealed into tubing, has been found to be suitable~
The described embodiment works in aqueous media as well as in a gaseous system, and behaves satisfactorily in test animals.
The combination of the use of luminescence quenching for oxygen determination, together with fiber optics is believed to be novel and highly advantageous. As noted above, the important features of the invention include the use oE a porous polymer support, proper selection of dye, and the use of a porous jacket or envelope. The use of a porous polymer as the dye support 16 i.5 essential for the best performance. As above mentioned, a suitable jacket 10 may be formed of Celgard, although other porous materials can be used.
Variations are possible. Thus, there are alternate ways of making the probe, e.g., a single fiber, rather than two fibers, could be used, with appropriate instrumentation modification, to reduce probe size.
In the typical optical system of Figure 7, the optical output of fiber l4 is transmitted through a collimating lens 18 to a 45-inclined dichroic filter 19. The transmitted light component passes through a blue filter 20 to a first photomultiplier tube 21. The reflected light component passes through a green filter 22 to a second photomultiplier tube 23.
As shown in Figure 6, the output currents from the photomultiplier tubes 21 and 23 are ~ed to respective current-to-voltage converter circuits 24, 25, and the resultant voltage signals are passed through respective active filters 26, 27 to the inputs of divider circuit 28 provided with means to apply an exponent m to t'ne quotient (Iblue divided by Igreen~
as given above). The Po2 analog value is then computed by feeding the output of circuit 28 to a final computing circuit 29 which subtracts the quantity 1 from its input signal and applies the coefficient P', as indicated in Figure 6.
It will be obv.ious to those skilled in the art that various changes may be made without departing from the scope of the invention and that the invention is not to be considered limited to what is shown in the drawings and described in the specification.
Figure 2 is a schematic representation o~
competing modes of deactivation o~ an optically excited molecule.
Figure 3 is a schematic representation showing the relationship between P' and P~ .
Figure 4 is a diaqr~mmatic view of an embodiment of a PO probe in accordance ~ith the present invention.
Figure 5 is a graph comparing theoretical Stern-Volmer data with typically observed data according to the invention.
Figures 6 and 7 respectively show schematically the optical system and the electronic computing system of a simple analog instrument employing testing probes according to the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to the drawings, and more particularly to Figure 4, a Po2 probe according to the present invention is generally designated at 8. The pO probe 8 is modelled after the pH probe previously developed by use (see Peterson et al, USP 4,200,110).
In the Po2 probe 8, the dye lS on an adsorbent support 16, is contained inside a section of tubing 10 of porous polyethylene, providing rapid equilibration with the surrounding oxygen and isolating the dye~
packing 16 from contamination. The tubing 10 is 73~i closed at one end, providing an axial tapered closure tip 9. A pair o~ ~lexi~le plastic o~tical fibers 12 and 14, for example, 150-micrometer strands of plastic optical fiber, are suitably secured in the other end o~ the tubing lO, with their ends optically exposed to the d~e 15 in the packing 16. The tubing lO may cornprise a section of porous polymer tubing about 5 mm long and 0.6 mm in diameter.
Blue light illumination passes down one optical fiber 12 to excite the dye 15 to fluorescence.
The green fluorescent light, along with scattered blue light, enters the other fiber 14 and passes to a measuring instrument (see Figures 6 and 7). The blue light intensity Io is used as the reference for optical compensation, and the green light intensity I
is a measure of the oxygen quenching.
The Stern-Volmer relation provides a linear quantitative basis for measuring Po2 by quenching Isee Figure 5). A curved relation is commonly observed (the literature with Stern-Volmer plotted data is large) and an exponent is often attached to the oxygen pressure to ~it the data to the equation.
A theoretical interpretation of the exponential relation is dlfficult to understand;
curved data can be equally well fitted by an offset constant on the intensity measurements, which can be explained as instrumental background or non-quenchable luminescence. For instrumental design purposes, however, using either an exponent m on the intensity ratio or an exponent n as the bracketed difference is more practical:
Po2 = p A simple analog instrument was constructed (see Figures 6 and 7) for evaluation of the probes.
Measurement of Po2 to the nearest ImmHg Po2 requi better than 0.1% intensity measurement error.
Instrumentally, the limiting factor is light source stability.
As noted above, there are three features of the above-described system which need to be properly selected, namely, the dye 15, the dye support 16 and the envelope 10.
A suitable dye 15 has the following characteristics:
a. It must be capable of excitation by and generation of visible wavelengths which can be transmitted by plastic optical fibers of a type which is unbreakable when subjected to sharp bends, is highly flexible, and which can be formed to provide easy optical coupling, such as with flared ends.
b. It must be stable to light and have adequate resistance to aging.
c. It must be non-toxic.
d. It must have sufficient oxygen quenching sensitivity (long mean lifetime of the excited state) as needed to attain measurement to the nearest l mmHg Po2 .
There is a problem in the selection of the dye lS in that many UV-excited dyes have a high quench sensitivity (benzene has one of the highest), but the requirement of visible light excitation makes it much more difficult to find a dye which will meet the requirement. A suitable dye i5 perylene dibutyrate.
~L~.,t3?73~
~nother suitable dye is Pylam Products LX7878~ Less suitable; but usable dyes are Terasil ~rilliant Flavine 8GFF; Nylosan Brilliant Flavine; Acridine Yellow; Brilliant Sulfaflavine; 2~7-dichloro-fluorescein; Acridine Orange; Coumarin 34; Coumarin 6;
sodium ~luorescein (Auranine), and some rhodamines.
~thers have appeared in the literature references given herein.
With regard to a suitable support 16, ~he quenching effect was classically observed on silica gel, and high sensitivity is achie~ed on this support.
A high-permeability support is necessary to expose the individual dye molecules to oxygen collision. A
solution of the dye in liquids or $olids is insen-sitive because of the low oxygen permeability of such materials.
The problem with inorganic adsorbents is that the ~uenching is humidity-sensitive; quenching and/or fluorescence is destroyed at 100% humidity, the condition of physiologic measurement.
Organic adsorbents, such as porous polymers, avoid the humidity problem, with a sacri~ice of quench sensitivity and these polymers determinable by routine testing in view of this disclosure, are desirably selected. A porous polymer, Rohm & Haas "Amberlite XAD4", a non-ionic hydrophobic polymer, is the preferred support 16. Examples of others are Gas Chrom Q, Amberlite XAD2, XAD8; Dow XFS4022;
Johns-Manville Chromosorb, Nos. 101, 102, 103, 104, 105, 106, 107, 108; Waters Porapak Nos. N, P, PS, Q, R, S, QS, T; Hamilton Co. PRP-l.
'73~1i In the ill~strated embodiment of the PO
probe 8, a liquid-water-i~permeable container of high oxygen permeabilit~ is required ~or the permeable envelope 10. Porous polypropylene sheet Celanese "Celgard", heat-sealed into tubing, has been found to be suitable~
The described embodiment works in aqueous media as well as in a gaseous system, and behaves satisfactorily in test animals.
The combination of the use of luminescence quenching for oxygen determination, together with fiber optics is believed to be novel and highly advantageous. As noted above, the important features of the invention include the use oE a porous polymer support, proper selection of dye, and the use of a porous jacket or envelope. The use of a porous polymer as the dye support 16 i.5 essential for the best performance. As above mentioned, a suitable jacket 10 may be formed of Celgard, although other porous materials can be used.
Variations are possible. Thus, there are alternate ways of making the probe, e.g., a single fiber, rather than two fibers, could be used, with appropriate instrumentation modification, to reduce probe size.
In the typical optical system of Figure 7, the optical output of fiber l4 is transmitted through a collimating lens 18 to a 45-inclined dichroic filter 19. The transmitted light component passes through a blue filter 20 to a first photomultiplier tube 21. The reflected light component passes through a green filter 22 to a second photomultiplier tube 23.
As shown in Figure 6, the output currents from the photomultiplier tubes 21 and 23 are ~ed to respective current-to-voltage converter circuits 24, 25, and the resultant voltage signals are passed through respective active filters 26, 27 to the inputs of divider circuit 28 provided with means to apply an exponent m to t'ne quotient (Iblue divided by Igreen~
as given above). The Po2 analog value is then computed by feeding the output of circuit 28 to a final computing circuit 29 which subtracts the quantity 1 from its input signal and applies the coefficient P', as indicated in Figure 6.
It will be obv.ious to those skilled in the art that various changes may be made without departing from the scope of the invention and that the invention is not to be considered limited to what is shown in the drawings and described in the specification.
Claims (14)
1. A probe for determining PO2 in the blood or tissue of a living animal, comprising: an oxygen-porous jacket of a size sufficiently small to be passed into a blood vessel; a porous dye support carried within said jacket and having high permeabilty to expose individual dye molecules carried thereby to oxygen collision; a non-toxic dye carried by said porous dye support, said dye being visibly lumi-nescent, having stability to light and aging, and being oxygen quenching-sensitive; and fiber optic means to pass excitation light to said dye within said jacket and collect luminescence therefrom.
2. A probe according to claim 1, wherein said dye is perylene dibutyrate. (Color Index 59075).
3. A probe according to claim 1 or claim 2, wherein said porous dye support is a porous organic polymer.
4. A probe according to claim 1, and wherein said porous dye support comprises silica gel.
5. A probe according to claim 1, and wherein said porous dye support comprises a porous adsorptive particulate polymeric material.
6. A probe according to claim 1, and wherein said porous dye support comprises Amberlite XAD4.
7. A probe according to claim 1, and wherein said oxygen-porous jacket comprises a tubular envelope of porous material.
8. A probe according to claim 7, and wherein said tubular envelope is formed of Celgard.
9. A probe according to claim 1, and wherein said oxygen-porous jacket comprises porous polypropylene sheet material heat-sealed into tubing, closed at one end and provided at said closed end with a tapered closure tip.
10. A probe according to claim 1, and wherein said fiber optic means comprises at least one strand of transparent plastic fiber with one end extending into said jacket and being optically exposed to said dye.
11. A probe according to claim 1, and wherein said fiber optic means comprises two strands of transparent flexible plastic fiber with ends extending into said jacket and being optically exposed to said dye.
12. A probe according to claim 1, and wherein said fiber optic means includes a strand of transparent plastic fiber with one end extending into said jacket and being optically exposed to said dye, optical beam splitting means optically exposed to the other end of said plastic fiber and forming two spaced optical beams from the light transmitted through the fiber, respective photoelectric signal generating means in the paths of said two optical beams, and PO2 computing circuit means connected to the output of said photoelectric signal generating means.
13. A probe according to claim 12, and respective different-color filter means optically interposed in the paths of the two optical beams between the beam-splitting means and the photo-electrical signal generating means.
14. A probe according to claim 13, and wherein one color filter means passes only light corresponding to the luminescence wavelength of the dye, and the other color filter means passes light only of a color corresponding to that of scattered incident light to which the dye is exposed and which is reflected from the dye.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US36342582A | 1982-03-30 | 1982-03-30 | |
US363,425 | 1982-03-30 | ||
US06/396,055 US4476870A (en) | 1982-03-30 | 1982-07-07 | Fiber optic PO.sbsb.2 probe |
US396,055 | 1982-07-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1187386A true CA1187386A (en) | 1985-05-21 |
Family
ID=27002060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000417127A Expired CA1187386A (en) | 1982-03-30 | 1982-12-07 | Fiber optic p ino2 xx probe |
Country Status (7)
Country | Link |
---|---|
US (1) | US4476870A (en) |
EP (1) | EP0091390B1 (en) |
AU (1) | AU565949B2 (en) |
CA (1) | CA1187386A (en) |
CH (1) | CH665345A5 (en) |
DE (1) | DE3381613D1 (en) |
WO (1) | WO1983003344A1 (en) |
Families Citing this family (185)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4577109A (en) * | 1980-10-06 | 1986-03-18 | Regents Of The University Of California | Remote multi-position information gathering system and method |
US4626693A (en) * | 1980-10-06 | 1986-12-02 | The Regents Of The University Of California | Remote multi-position information gathering system and method |
US4586819A (en) * | 1982-07-09 | 1986-05-06 | Hitachi, Ltd. | Laser Raman microprobe |
CA1261717A (en) * | 1982-12-23 | 1989-09-26 | John R. Bacon | Method and apparatus for oxygen determination |
US5030420A (en) * | 1982-12-23 | 1991-07-09 | University Of Virginia Alumni Patents Foundation | Apparatus for oxygen determination |
EP0126600B1 (en) * | 1983-05-17 | 1989-03-01 | Elf U.K. Plc | Optical fibre probe |
US4553034A (en) * | 1983-12-02 | 1985-11-12 | Westinghouse Electric Corp. | Ion exchange resin intrusion monitor |
US4622974A (en) * | 1984-03-07 | 1986-11-18 | University Of Tennessee Research Corporation | Apparatus and method for in-vivo measurements of chemical concentrations |
GB2159620A (en) * | 1984-05-29 | 1985-12-04 | Norman Barrie Jones | Photoelectric pressure transducer without elastic diaphragm |
JPH0697205B2 (en) * | 1984-09-19 | 1994-11-30 | シーメンス、アクチエンゲゼルシヤフト | Method and apparatus for measuring parameter of sample medium |
DE3569666D1 (en) * | 1984-12-26 | 1989-06-01 | Nivarox Sa | Device to locate in situ through-holes in a hollow pin that is implanted into the medullary canal for the retention of the fragments of a fractured bone |
EP0190830A3 (en) * | 1985-02-04 | 1988-04-27 | Gould Inc. | Single optical fiber sensor for measuring the partial pressure of oxygen |
US4752115A (en) * | 1985-02-07 | 1988-06-21 | Spectramed, Inc. | Optical sensor for monitoring the partial pressure of oxygen |
EP0215854A4 (en) * | 1985-03-20 | 1988-12-12 | Univ Monash | Fibre optic chemical sensor. |
US4666672A (en) * | 1985-04-08 | 1987-05-19 | University Of California | Optrode for sensing hydrocarbons |
US5354825A (en) * | 1985-04-08 | 1994-10-11 | Klainer Stanley M | Surface-bound fluorescent polymers and related methods of synthesis and use |
US4801655A (en) * | 1985-06-21 | 1989-01-31 | Gould, Inc. | Fiber optic pH sensor having low drift rate |
US5043286A (en) * | 1985-07-03 | 1991-08-27 | Abbott Laboratories | Method and sensor for measuring oxygen concentration |
US4810655A (en) * | 1985-07-03 | 1989-03-07 | Abbott Laboratories | Method for measuring oxygen concentration |
JPS62503191A (en) * | 1985-07-03 | 1987-12-17 | インタ−ナシヨナル バイオメデイクス,インコ−ポレイテツド | Method and composition for measuring oxygen concentration |
US4613237A (en) * | 1985-08-22 | 1986-09-23 | United Technologies Corporation | Method for determining the temperature of a fluid |
US5034189A (en) * | 1985-08-27 | 1991-07-23 | The Regents Of The University Of California | Fluorescent probe for rapid measurement of analyte concentration |
AT387860B (en) * | 1985-09-16 | 1989-03-28 | Optical Sensing Technology | METHOD AND DEVICE FOR TUMOR DIAGNOSIS BY MEANS OF SERA |
US4936679A (en) * | 1985-11-12 | 1990-06-26 | Becton, Dickinson And Company | Optical fiber transducer driving and measuring circuit and method for using same |
US4737343A (en) * | 1986-01-21 | 1988-04-12 | The Regents Of The University Of California | Gas-sensing optrode |
US5019350A (en) * | 1986-02-13 | 1991-05-28 | Pfizer Hospital Products, Inc. | Fluorescent polymers |
US4710623A (en) * | 1986-02-27 | 1987-12-01 | Eli Lilly And Company | Optical fiber catheter with fiber-contained reactive element |
US5006314A (en) * | 1986-04-18 | 1991-04-09 | Minnesota Mining And Manufacturing Company | Sensor and method for sensing the concentration of a component in a medium |
US4822127A (en) * | 1986-06-16 | 1989-04-18 | Shiley Incorporated | Multi-channel optical transmission system |
US4927222A (en) * | 1986-06-16 | 1990-05-22 | Shiley Incorporated | Dual optical fiber device |
US4854321A (en) * | 1986-06-18 | 1989-08-08 | Medex, Inc. | Integrated optic system for monitoring blood gases |
US5001054A (en) * | 1986-06-26 | 1991-03-19 | Becton, Dickinson And Company | Method for monitoring glucose |
US4981779A (en) * | 1986-06-26 | 1991-01-01 | Becton, Dickinson And Company | Apparatus for monitoring glucose |
US4895156A (en) * | 1986-07-02 | 1990-01-23 | Schulze John E | Sensor system using fluorometric decay measurements |
US4800886A (en) * | 1986-07-14 | 1989-01-31 | C. R. Bard, Inc. | Sensor for measuring the concentration of a gaseous component in a fluid by absorption |
US4929562A (en) * | 1986-08-20 | 1990-05-29 | The Regents Of The University Of California | Method and apparatus for detecting gem-polyhalogenated hydrocarbons |
US4861727A (en) * | 1986-09-08 | 1989-08-29 | C. R. Bard, Inc. | Luminescent oxygen sensor based on a lanthanide complex |
US4900933A (en) * | 1986-09-08 | 1990-02-13 | C. R. Bard, Inc. | Excitation and detection apparatus for remote sensor connected by optical fiber |
US4760250A (en) * | 1986-09-29 | 1988-07-26 | Spectramed, Inc. | Optoelectronics system for measuring environmental properties having plural feedback detectors |
US5120510A (en) * | 1986-10-10 | 1992-06-09 | Minnesota Mining And Manufacturing Company | Sensor and method for sensing the concentration of a component in a medium |
US5012809A (en) * | 1986-10-10 | 1991-05-07 | Shulze John E | Fiber optic catheter system with fluorometric sensor and integral flexure compensation |
US4886338A (en) * | 1986-10-10 | 1989-12-12 | Minnesota Mining And Manufacturing Company | Optical fiber event sensor |
US4934369A (en) * | 1987-01-30 | 1990-06-19 | Minnesota Mining And Manufacturing Company | Intravascular blood parameter measurement system |
US5048525A (en) * | 1987-01-30 | 1991-09-17 | Minnesota Mining And Manufacturing Company | Blood parameter measurement system with compliant element |
US4989606A (en) * | 1987-01-30 | 1991-02-05 | Minnesota Mining And Manufactoring Company | Intravascular blood gas sensing system |
US4830013A (en) * | 1987-01-30 | 1989-05-16 | Minnesota Mining And Manufacturing Co. | Intravascular blood parameter measurement system |
US4951669A (en) * | 1987-01-30 | 1990-08-28 | Minnesota Mining And Manufacturing Company | Blood parameter measurement system |
US5462052A (en) * | 1987-01-30 | 1995-10-31 | Minnesota Mining And Manufacturing Co. | Apparatus and method for use in measuring a compositional parameter of blood |
US5093266A (en) * | 1987-02-06 | 1992-03-03 | Shiley Inc. | Sensor system |
US4833091A (en) * | 1987-02-06 | 1989-05-23 | Shiley Incorporated | Sensor system |
US4852579A (en) * | 1987-04-20 | 1989-08-01 | Karl Storz Endoscopy Gmbh And Company | Photocharacterization and treatment of normal abnormal and ectopic endometrium |
AT389590B (en) * | 1987-05-27 | 1989-12-27 | Avl Verbrennungskraft Messtech | METHOD FOR THE CONTINUOUS, QUANTITATIVE DETERMINATION OF SULFUR DIOXIDE AND ARRANGEMENT FOR IMPLEMENTING THE METHOD |
US5043285A (en) * | 1987-07-09 | 1991-08-27 | Allied-Signal Inc. | Optical detection of oxygen |
US4785814A (en) * | 1987-08-11 | 1988-11-22 | Cordis Corporation | Optical probe for measuring pH and oxygen in blood and employing a composite membrane |
JPS6463842A (en) * | 1987-09-03 | 1989-03-09 | Terumo Corp | Method and apparatus for measuring concentration of optical material |
US4842783A (en) * | 1987-09-03 | 1989-06-27 | Cordis Corporation | Method of producing fiber optic chemical sensors incorporating photocrosslinked polymer gels |
US4974929A (en) * | 1987-09-22 | 1990-12-04 | Baxter International, Inc. | Fiber optical probe connector for physiologic measurement devices |
JP2628355B2 (en) * | 1987-09-22 | 1997-07-09 | バクスター、インターナショナル、インコーポレイテッド | Fiber optic probe connector for physiological measurement devices |
EP0312293A3 (en) * | 1987-10-16 | 1990-03-14 | O.C.T. Optical Chemical Technologies Limited | Sensing device for analysis |
US5037615A (en) * | 1987-10-30 | 1991-08-06 | Cordis Corporation | Tethered pair fluorescence energy transfer indicators, chemical sensors, and method of making such sensors |
US5242835A (en) * | 1987-11-03 | 1993-09-07 | Radiometer A/S | Method and apparatus for determining the concentration of oxygen |
DK163194C (en) * | 1988-12-22 | 1992-06-22 | Radiometer As | METHOD OF PHOTOMETRIC IN VITRO DETERMINING A BLOOD GAS PARAMETER IN A BLOOD TEST |
US4994396A (en) * | 1987-12-14 | 1991-02-19 | The Dow Chemical Company | Method for measuring the concentration or partial pressure of oxygen |
US4929049A (en) * | 1988-01-29 | 1990-05-29 | Fiberchem, Inc. | Fiber optic refractive index sensor using a metal clad |
US5518895A (en) * | 1990-02-15 | 1996-05-21 | Akzo N.V. | Device for detecting microorganisms using piezoelectric means |
US5217876A (en) * | 1988-03-15 | 1993-06-08 | Akzo N.V. | Method for detecting microorganisms |
US5127077A (en) * | 1988-07-25 | 1992-06-30 | Abbott Laboratories | Fiber-optic physiological probes |
US4925268A (en) * | 1988-07-25 | 1990-05-15 | Abbott Laboratories | Fiber-optic physiological probes |
US5000901A (en) * | 1988-07-25 | 1991-03-19 | Abbott Laboratories | Fiber-optic physiological probes |
US4889407A (en) * | 1988-12-02 | 1989-12-26 | Biomedical Sensors Limited | Optical waveguide sensor and method of making same |
US5047350A (en) * | 1989-01-19 | 1991-09-10 | Eastman Kodak Company | Material and method for oxygen sensing |
EP0381026A3 (en) * | 1989-02-03 | 1991-05-02 | F. Hoffmann-La Roche Ag | Optical oxygen sensor |
US4892383A (en) * | 1989-02-17 | 1990-01-09 | Fiberchem Inc. | Reservoir fiber optic chemical sensors |
US4906249A (en) * | 1989-02-23 | 1990-03-06 | Medtronic, Inc. | Terpolymer composition with bound indicator dye for fiber optic probe |
US5094959A (en) * | 1989-04-26 | 1992-03-10 | Foxs Labs | Method and material for measurement of oxygen concentration |
US5858769A (en) * | 1989-05-15 | 1999-01-12 | Akzo Nobel N.V. | Device for detecting microorganisms |
US5434084A (en) * | 1989-09-06 | 1995-07-18 | The Washington Research Foundation | Flow optrode having separate reaction and detection chambers |
CA2022558A1 (en) * | 1989-09-11 | 1991-03-12 | Richard Barner | Optical oxygen sensor |
JP2798450B2 (en) * | 1989-12-08 | 1998-09-17 | 株式会社日立製作所 | Biological measurement device |
US5244810A (en) * | 1990-01-12 | 1993-09-14 | Gottlieb Amos J | Analytical method |
US5127405A (en) * | 1990-02-16 | 1992-07-07 | The Boc Group, Inc. | Biomedical fiber optic probe with frequency domain signal processing |
US5102625A (en) * | 1990-02-16 | 1992-04-07 | Boc Health Care, Inc. | Apparatus for monitoring a chemical concentration |
US5175016A (en) * | 1990-03-20 | 1992-12-29 | Minnesota Mining And Manufacturing Company | Method for making gas sensing element |
EP0447949A1 (en) * | 1990-03-22 | 1991-09-25 | F. Hoffmann-La Roche Ag | Optical oxygen sensor |
US5115133A (en) * | 1990-04-19 | 1992-05-19 | Inomet, Inc. | Testing of body fluid constituents through measuring light reflected from tympanic membrane |
US5115811A (en) * | 1990-04-30 | 1992-05-26 | Medtronic, Inc. | Temperature measurement and compensation in a fiber-optic sensor |
US5047627A (en) * | 1990-05-18 | 1991-09-10 | Abbott Laboratories | Configuration fiber-optic blood gas sensor bundle and method of making |
US5124130A (en) * | 1990-05-22 | 1992-06-23 | Optex Biomedical, Inc. | Optical probe |
US5271073A (en) * | 1990-08-10 | 1993-12-14 | Puritan-Bennett Corporation | Optical fiber sensor and method of manufacture |
US5186173A (en) * | 1990-08-14 | 1993-02-16 | Drexel University | Method for in vivo measurement of oxygen concentration levels |
US5152287A (en) * | 1990-08-15 | 1992-10-06 | Cordis Corporation | Cross-linked fluorinated polymers for use in gas sensors |
WO1992005441A1 (en) * | 1990-09-17 | 1992-04-02 | Baxter International Inc. | Water insensitive tissue oxygen sensor |
US5176882A (en) * | 1990-12-06 | 1993-01-05 | Hewlett-Packard Company | Dual fiberoptic cell for multiple serum measurements |
US5273716A (en) * | 1991-01-14 | 1993-12-28 | Electric Power Research Institute, Inc. | pH optrode |
US5142155A (en) * | 1991-03-11 | 1992-08-25 | Hewlett-Packard Company | Catheter tip fluorescence-quenching fiber optic pressure sensor |
US5435307A (en) * | 1991-03-29 | 1995-07-25 | The United States Of America As Represented By The Secretary Of The Department Of Health And Human Services | Surface fluorescent monitor |
US5119463A (en) * | 1991-04-09 | 1992-06-02 | Abbott Laboratories | Compound optical probe employing single optical waveguide |
DE4120688A1 (en) * | 1991-06-22 | 1993-01-14 | Wienert Volker | Quantitative detection appts. for fluorescent material in human skin tissue - uses measurement head with stimulation light source and tuned photodiode fluorescent light receiver |
US5241184A (en) * | 1991-09-26 | 1993-08-31 | Electric Power Research Institute | Apparatus and method for quantizing remaining lifetime of transmission cable insulation |
US5204922A (en) * | 1991-10-22 | 1993-04-20 | Puritan-Bennett Corporation | Optical signal channel selector |
US5335305A (en) * | 1991-12-19 | 1994-08-02 | Optex Biomedical, Inc. | Optical sensor for fluid parameters |
US5335658A (en) * | 1992-06-29 | 1994-08-09 | Minnesota Mining And Manufacturing Company | Intravascular blood parameter sensing system |
US5326531A (en) * | 1992-12-11 | 1994-07-05 | Puritan-Bennett Corporation | CO2 sensor using a hydrophilic polyurethane matrix and process for manufacturing |
US5515864A (en) * | 1994-04-21 | 1996-05-14 | Zuckerman; Ralph | Method and apparatus for the in vivo measurement of oxygen concentration levels by the indirect determination of fluoescence lifetime |
US5605152A (en) * | 1994-07-18 | 1997-02-25 | Minimed Inc. | Optical glucose sensor |
US5718842A (en) * | 1994-10-07 | 1998-02-17 | Joanneum Reserach Forschungsgesellschaft Mbh | Luminescent dye comprising metallocomplex of a oxoporphyrin |
US5706808A (en) * | 1995-01-31 | 1998-01-13 | Kleinerman; Marcos Y. | Fiber optic system for measuring cardiac output |
US5490490A (en) * | 1995-04-27 | 1996-02-13 | Ford Motor Company | On-board gas composition sensor for internal combustion engine exhaust gases |
US5902246A (en) * | 1996-03-26 | 1999-05-11 | Lifespex, Incorporated | Method and apparatus for calibrating an optical probe |
US5863460A (en) * | 1996-04-01 | 1999-01-26 | Chiron Diagnostics Corporation | Oxygen sensing membranes and methods of making same |
US6815211B1 (en) | 1998-08-04 | 2004-11-09 | Ntc Technology | Oxygen monitoring methods and apparatus (I) |
US7335164B2 (en) | 1996-07-15 | 2008-02-26 | Ntc Technology, Inc. | Multiple function airway adapter |
US6325978B1 (en) | 1998-08-04 | 2001-12-04 | Ntc Technology Inc. | Oxygen monitoring and apparatus |
US6274086B1 (en) | 1996-12-16 | 2001-08-14 | The Trustees Of The University Of Pennsylvania | Apparatus for non-invasive imaging oxygen distribution in multi-dimensions |
US5830138A (en) * | 1996-12-16 | 1998-11-03 | Trustees Of The University Of Pennsylvania | Intravascular catheter probe for clinical oxygen, pH and CO2 measurement |
US6048359A (en) * | 1997-08-25 | 2000-04-11 | Advanced Photodynamic Technologies, Inc. | Spatial orientation and light sources and method of using same for medical diagnosis and photodynamic therapy |
US6190612B1 (en) | 1998-01-21 | 2001-02-20 | Bayer Corporation | Oxygen sensing membranes and methods of making same |
US6254831B1 (en) | 1998-01-21 | 2001-07-03 | Bayer Corporation | Optical sensors with reflective materials |
US6306347B1 (en) | 1998-01-21 | 2001-10-23 | Bayer Corporation | Optical sensor and method of operation |
CA2329783A1 (en) | 1998-05-13 | 1999-11-18 | Yellow Springs Optical Sensor Co. Pll. | System and method for optical chemical sensing |
US6107083A (en) * | 1998-08-21 | 2000-08-22 | Bayer Corporation | Optical oxidative enzyme-based sensors |
US6219566B1 (en) | 1999-07-13 | 2001-04-17 | Photonics Research Ontario | Method of measuring concentration of luminescent materials in turbid media |
US6701168B1 (en) | 1999-10-14 | 2004-03-02 | Trustees Of The University Of Pennsylvania | Apparatus for measuring an oxygen concentration gradient and method of use thereof |
US6395555B1 (en) | 1999-10-14 | 2002-05-28 | David F. Wilson | Method and apparatus for determining the effect of a drug on cells |
US8527046B2 (en) | 2000-04-20 | 2013-09-03 | Medtronic, Inc. | MRI-compatible implantable device |
US6925328B2 (en) | 2000-04-20 | 2005-08-02 | Biophan Technologies, Inc. | MRI-compatible implantable device |
US20020116029A1 (en) | 2001-02-20 | 2002-08-22 | Victor Miller | MRI-compatible pacemaker with power carrying photonic catheter and isolated pulse generating electronics providing VOO functionality |
US6829509B1 (en) * | 2001-02-20 | 2004-12-07 | Biophan Technologies, Inc. | Electromagnetic interference immune tissue invasive system |
US6731979B2 (en) | 2001-08-30 | 2004-05-04 | Biophan Technologies Inc. | Pulse width cardiac pacing apparatus |
US7054686B2 (en) | 2001-08-30 | 2006-05-30 | Biophan Technologies, Inc. | Pulsewidth electrical stimulation |
US20030077205A1 (en) * | 2001-10-24 | 2003-04-24 | Xu Tom C. | Diagnostic test optical fiber tips |
AU2002360326A1 (en) | 2001-10-31 | 2003-05-12 | Biophan Technologies, Inc. | Hermetic component housing for photonic catheter |
US6968236B2 (en) * | 2002-01-28 | 2005-11-22 | Biophan Technologies, Inc. | Ceramic cardiac electrodes |
US6711440B2 (en) | 2002-04-11 | 2004-03-23 | Biophan Technologies, Inc. | MRI-compatible medical device with passive generation of optical sensing signals |
US6725092B2 (en) | 2002-04-25 | 2004-04-20 | Biophan Technologies, Inc. | Electromagnetic radiation immune medical assist device adapter |
JP3653536B2 (en) * | 2002-06-21 | 2005-05-25 | 独立行政法人航空宇宙技術研究所 | Optical oxygen concentration measuring method and optical oxygen concentration measuring sensor |
US6925322B2 (en) | 2002-07-25 | 2005-08-02 | Biophan Technologies, Inc. | Optical MRI catheter system |
US6999807B2 (en) * | 2003-01-23 | 2006-02-14 | Scimed Life Systems, Inc. | pH measuring balloon |
DE102005024578A1 (en) * | 2005-05-25 | 2006-11-30 | Raumedic Ag | Probe for measuring oxygen content in biological material comprises distal fiber section inclusive of distal end face along with dye enclosed by oxygen-penetrable, fluid-impenetrable membrane which in enclosed area provides gas space |
US7611621B2 (en) * | 2005-06-13 | 2009-11-03 | Nova Biomedical Corporation | Disposable oxygen sensor and method for correcting oxygen effect on oxidase-based analytical devices |
US20060289796A1 (en) * | 2005-06-22 | 2006-12-28 | Cryovac, Inc. | UV-C sensitive composition and dosimeter |
US7648624B2 (en) * | 2005-07-26 | 2010-01-19 | Nova Biomedical Corporation | Oxygen sensor |
DE102005036410A1 (en) * | 2005-07-29 | 2007-02-01 | Biocam Gmbh | Method for determining the oxygen partial pressure distribution in at least one tissue surface section, in particular skin tissue surface section |
EP2679155A1 (en) | 2006-01-04 | 2014-01-01 | The Trustees of The University of Pennsylvania | Oxygen sensor for internal monitoring of tissue oxygen in vivo |
US8129105B2 (en) | 2006-04-13 | 2012-03-06 | Ralph Zuckerman | Method and apparatus for the non-invasive measurement of tissue function and metabolism by determination of steady-state fluorescence anisotropy |
EP2989975B1 (en) | 2007-02-06 | 2018-06-13 | Medtronic MiniMed, Inc. | Optical systems and methods for rationmetric measurement of blood glucose concentration |
US8088097B2 (en) | 2007-11-21 | 2012-01-03 | Glumetrics, Inc. | Use of an equilibrium intravascular sensor to achieve tight glycemic control |
WO2008118042A1 (en) * | 2007-03-23 | 2008-10-02 | St. Jude Medical Ab | Implantable medical device |
WO2008133551A1 (en) * | 2007-04-27 | 2008-11-06 | St. Jude Medical Ab | Implantable concentration sensor and device |
WO2008141241A1 (en) | 2007-05-10 | 2008-11-20 | Glumetrics, Inc. | Equilibrium non-consuming fluorescence sensor for real time intravascular glucose measurement |
WO2009129186A2 (en) | 2008-04-17 | 2009-10-22 | Glumetrics, Inc. | Sensor for percutaneous intravascular deployment without an indwelling cannula |
US10080499B2 (en) * | 2008-07-30 | 2018-09-25 | Medtronic, Inc. | Implantable medical system including multiple sensing modules |
US9874520B1 (en) | 2008-11-07 | 2018-01-23 | Mocon, Inc. | Epi-fluoresence confocal optical analyte sensor |
US8323978B2 (en) * | 2008-11-07 | 2012-12-04 | Mocon, Inc. | Calibration system and technique for photoluminescent oxygen sensors with zero point maintained with a metal-air battery |
CN102265136B (en) * | 2008-11-07 | 2014-08-13 | 膜康公司 | Calibration card for oxygen optical sensors |
US8241911B2 (en) * | 2008-11-07 | 2012-08-14 | Mocon, Inc. | Calibration card for photoluminescent oxygen sensors with zero point maintained with a metal-air battery |
WO2010066273A1 (en) * | 2008-12-11 | 2010-06-17 | Luxcel Biosciences Limited | Optochemical sensor active element, method of its preparation and use |
EP2483679A4 (en) | 2009-09-30 | 2013-04-24 | Glumetrics Inc | Sensors with thromboresistant coating |
US8467843B2 (en) | 2009-11-04 | 2013-06-18 | Glumetrics, Inc. | Optical sensor configuration for ratiometric correction of blood glucose measurement |
US20110136247A1 (en) * | 2009-12-07 | 2011-06-09 | Dmitri Boris Papkovsky | Photoluminescent oxygen probe with reduced cross-sensitivity to humidity |
US8694069B1 (en) | 2009-12-21 | 2014-04-08 | Kosense, LLC | Fiber-optic probe with embedded peripheral sensors for in-situ continuous monitoring |
EP2529201A1 (en) | 2010-01-27 | 2012-12-05 | Luxcel Biosciences Ltd. | Photoluminescent pressure probe |
US8647876B2 (en) * | 2010-03-31 | 2014-02-11 | Fujifilm Corporation | Oxygen permeability measuring apparatus and method, and defect inspection apparatus and method |
US8248612B2 (en) * | 2010-07-26 | 2012-08-21 | Ut-Batelle, Llc | Oxygen concentration sensors and methods of rapidly measuring the concentration of oxygen in fluids |
US20120129268A1 (en) | 2010-11-19 | 2012-05-24 | Mayer Daniel W | Photoluminescent oxygen probe with reduced cross-sensitivity to humidity |
ITFI20100237A1 (en) * | 2010-12-03 | 2012-06-04 | Consiglio Naz Delle Richerche | "OPTICAL FIBER PROBE AND USING SIZE OF MEASURING SENSOR" |
US9274060B1 (en) | 2011-01-13 | 2016-03-01 | Mocon, Inc. | Methods for transmembrane measurement of oxygen concentration and monitoring changes in oxygen concentration within a space enclosed by a membrane employing a photoluminescent transmembrane oxygen probe |
US9121827B2 (en) | 2011-06-30 | 2015-09-01 | Mocon, Inc. | Method of contemporaneously monitoring changes in analyte concentration in a plurality of samples on individual schedules |
EP4016051A1 (en) | 2011-08-17 | 2022-06-22 | Agilent Technologies, Inc. | Tool and method for validating operational performance of a photoluminescence based analytical instrument |
WO2013034176A1 (en) | 2011-09-06 | 2013-03-14 | Luxcel Biosciences Limited | Dry laminated photoluminescent probe and methods of manufacture and use |
WO2013075736A1 (en) | 2011-11-22 | 2013-05-30 | Luxcel Biosciences Limited | Device and method for rapid assay of multiple biological samples for oxygen consumption |
US11293866B2 (en) | 2012-03-22 | 2022-04-05 | John EASTMAN | Fiber optic analyte sensor |
US9057687B2 (en) | 2012-04-20 | 2015-06-16 | Mocon, Inc. | Calibration vial and technique for calibrating a fiber optic oxygen sensing needle |
US8658429B1 (en) | 2012-08-06 | 2014-02-25 | Mocon, Inc. | Photoluminescent oxygen probe tack |
WO2014086411A1 (en) | 2012-12-05 | 2014-06-12 | Luxcel Biosciences Limited | Individually and flexibly deployable target-analyte sensitive particulate probes and method of making and using |
EP4079242A1 (en) * | 2013-03-19 | 2022-10-26 | Surgisense Corporation | Apparatus, systems and methods for determining tissue oxygenation |
US9316554B1 (en) | 2014-12-23 | 2016-04-19 | Mocon, Inc. | Fiber optic analyte sensor with integrated in situ total pressure correction |
WO2017070046A1 (en) | 2015-10-21 | 2017-04-27 | A-Scan Llc | Depth scanning oxygen sensor |
WO2018206746A1 (en) | 2017-05-10 | 2018-11-15 | Luxcel Biosciences Limited | Real-time cellular or pericellular microenvironmental oxygen control |
CN110621586A (en) | 2017-05-16 | 2019-12-27 | 安捷伦科技有限公司 | Headspace-eliminating microtiter plate cover and method for optically measuring the oxygen concentration of a well through the cover |
KR102098942B1 (en) * | 2018-03-23 | 2020-04-08 | 재단법인 아산사회복지재단 | Implantable optical member, medical endoscope and implant method of optical member |
US11193916B2 (en) * | 2019-05-02 | 2021-12-07 | SciLogica Corp. | Calibration of a gas sensor |
US20220369968A1 (en) | 2021-05-19 | 2022-11-24 | Biosense Webster (Israel) Ltd. | Catheter with blood o2/co2 concentration measurement |
WO2023196547A1 (en) | 2022-04-08 | 2023-10-12 | Agilent Technologies, Inc. | Microtiter plate lid and magnetic adapter |
WO2023196546A1 (en) | 2022-04-08 | 2023-10-12 | Agilent Technologies, Inc. | Headspace eliminating microtiter plate lid |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3612866A (en) * | 1969-07-08 | 1971-10-12 | Brian Stevens | Instrument for determining oxygen quantities by measuring oxygen quenching of fluorescent radiation |
US3814081A (en) * | 1971-04-02 | 1974-06-04 | Olympus Optical Co | Optical measuring catheter |
US3807390A (en) * | 1972-12-04 | 1974-04-30 | American Optical Corp | Fiber optic catheter |
DD106086A1 (en) * | 1973-07-16 | 1974-05-20 | ||
DE2508637C3 (en) * | 1975-02-28 | 1979-11-22 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V., 3400 Goettingen | Arrangement for the optical measurement of blood gases |
DE2632556C2 (en) * | 1976-07-20 | 1984-09-20 | Max Planck Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen | Light feed for a device for the optical measurement of substance concentrations |
DE2632710C3 (en) * | 1976-07-21 | 1979-11-08 | Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V., 3400 Goettingen | Arrangement for the optical measurement of substance concentrations |
GB2003050B (en) * | 1977-08-25 | 1982-02-10 | Medishield Corp Ltd | Apparatus for analysis of absorbed gases |
US4201222A (en) * | 1977-08-31 | 1980-05-06 | Thomas Haase | Method and apparatus for in vivo measurement of blood gas partial pressures, blood pressure and blood pulse |
US4200110A (en) * | 1977-11-28 | 1980-04-29 | United States Of America | Fiber optic pH probe |
JPS54155682A (en) * | 1978-05-29 | 1979-12-07 | Sumitomo Electric Industries | Sensor for measuring oxygen concentration in percutaneous blood |
DE2833356A1 (en) * | 1978-07-29 | 1980-02-14 | Max Planck Gesellschaft | METHOD FOR THE OPTICAL MEASUREMENT OF SUBSTANCE CONCENTRATIONS |
-
1982
- 1982-07-07 US US06/396,055 patent/US4476870A/en not_active Expired - Lifetime
- 1982-10-15 AU AU90592/82A patent/AU565949B2/en not_active Ceased
- 1982-10-15 WO PCT/US1982/001418 patent/WO1983003344A1/en unknown
- 1982-10-15 CH CH6521/83A patent/CH665345A5/en not_active IP Right Cessation
- 1982-12-07 CA CA000417127A patent/CA1187386A/en not_active Expired
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1983
- 1983-03-28 DE DE8383450008T patent/DE3381613D1/en not_active Expired - Fee Related
- 1983-03-28 EP EP83450008A patent/EP0091390B1/en not_active Expired - Lifetime
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US4476870A (en) | 1984-10-16 |
AU565949B2 (en) | 1987-10-01 |
CH665345A5 (en) | 1988-05-13 |
EP0091390A1 (en) | 1983-10-12 |
AU9059282A (en) | 1983-10-24 |
DE3381613D1 (en) | 1990-07-05 |
WO1983003344A1 (en) | 1983-10-13 |
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