SE439068B - TRANSCUTANIC ACID CONCENTRATION METHOD SENSOR - Google Patents
TRANSCUTANIC ACID CONCENTRATION METHOD SENSORInfo
- Publication number
- SE439068B SE439068B SE7904172A SE7904172A SE439068B SE 439068 B SE439068 B SE 439068B SE 7904172 A SE7904172 A SE 7904172A SE 7904172 A SE7904172 A SE 7904172A SE 439068 B SE439068 B SE 439068B
- Authority
- SE
- Sweden
- Prior art keywords
- cathode
- electrode
- electrode membrane
- membrane
- heating device
- Prior art date
Links
Classifications
-
- 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
- A61B5/14542—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 for measuring blood gases
-
- 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
- A61B5/1468—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 chemical or electrochemical methods, e.g. by polarographic means
- A61B5/1477—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 chemical or electrochemical methods, e.g. by polarographic means non-invasive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- Medical Informatics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Optics & Photonics (AREA)
- Veterinary Medicine (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Biophysics (AREA)
- Public Health (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Description
79oh172-9 _syret vid katoden 1, medan en oxidationsreaktion av silvret sker vid anoden 3. Som följd härav flyter en elektrolytisk ström mellan anoden och katoden, och strömintensiteten är proportionell mot antalet syremolekyler, som passerar genom membranet. Mätningen av denna ström anger approximativt kon- centrationen av syre i-den subkutana vävnaden och följaktligen i det artäriella blodet. 79oh172-9 - the oxygen at the cathode 1, while an oxidation reaction of the silver takes place at the anode 3. As a result, an electrolytic current flows between the anode and the cathode, and the current intensity is proportional to the number of oxygen molecules passing through the membrane. The measurement of this current approximately indicates the concentration of oxygen in the subcutaneous tissue and consequently in the arterial blood.
Den ovan beskrivna konventionella avkännaren är emel- lertid ofördelaktig vad gäller följande punkter: Såsom fram- går av fig. 1 har värmeanordningskroppen 10 en öppning 11, som frilägger elektrodmembranet, varvid dock öppningen 11 är relativt stor. Då sålunda avkännaren föres i beröring med hud- ytan, höjer sig denna in i öppningen 11 och skjuter elektrod- membranet 5. Som följd härav förändras elektrolytskiktets 8 tjocklek. Det blir sålunda svårt att mäta på stabilt sätt.However, the above-described conventional sensor is disadvantageous with respect to the following points: As can be seen from Fig. 1, the heating device body 10 has an opening 11, which exposes the electrode membrane, however, the opening 11 is relatively large. Thus, when the sensor is brought into contact with the skin surface, it rises into the opening 11 and pushes the electrode membrane 5. As a result, the thickness of the electrolyte layer 8 changes. It thus becomes difficult to measure in a stable manner.
Vidare befinner sig periferikanten hos öppningen 11, som frilägger elektrodmembranet, på avsevärt avstånd från katoden 1. Härigenom blir temperaturen hos den mot katoden 1 vända huden avsevärt lägre än temperaturen hos huden i direkt beröring med värmeanordningskroppen 10, d.v.s. hudytan värmes på icke likformigt sätt. Det blir sålunda svårt att utföra en stabil mätning av det artäriella blodet.Furthermore, the peripheral edge of the opening 11, which exposes the electrode membrane, is at a considerable distance from the cathode 1. As a result, the temperature of the skin facing the cathode 1 is considerably lower than the temperature of the skin in direct contact with the heating device body 10, i.e. the skin surface is heated in a non-uniform manner. Thus, it becomes difficult to perform a stable measurement of the arterial blood.
Föreliggande uppfinning syftar till att erbjuda en transkutan blodsyrekoncentrationsmätningsavkännare, som icke är behäftad med den tidigare kända teknikens ovan beskrivna nackdelar. Avkännaren skall kunna mäta med hög noggrannhet.The present invention aims to provide a transcutaneous blood acid concentration measurement sensor which does not suffer from the above-described disadvantages of the prior art. The sensor must be able to measure with high accuracy.
Dessa syften nås med avkännaren enligt patentkraven.These objects are achieved with the sensor according to the claims.
Uppfinningen förklaras närmare i det följande med hän- visning till bifogad ritning.The invention is explained in more detail in the following with reference to the accompanying drawing.
Fig. 1 visar ett vertikalsnitt genom en konventionell avkännare, och fig. 2 ett vertikalsnitt genom en avkännare enligt uppfinningen.Fig. 1 shows a vertical section through a conventional sensor, and Fig. 2 a vertical section through a sensor according to the invention.
Avkännaren enligt uppfinningen, fig. 2,kan erhållas genom en modifiering av den ovan beskrivna, konventionella avkännaren, varvid elektrodaggregatet göres avsmalnande. När- mare bestämt har elektrodaggregatet en konisk yta 12, som är utformad på änddelen av isolatorn 2 mellan katoden 1 och ano- 7904172-9 den 3. Vidare formas en konisk yta 13 av samma konicitetsvin~ kel som den koniska ytan 12 på insidan av värmeanordnings~ kroppens 10 elektrodmembranfriläggande öppning 11. Öppningens 11 kant är placerad intill katoden 1, och elektrodmembranets 5 friläggande yta är reducerad. Vidare är katodens ände i när- heten av den nedre änden av en cirkulär, stympad kon, som bil- das av den komiska ytan 13. Elektrodmembranet 5 sträcker sig genom det smala gapet mellan de båda koniska ytorna 12 och 13.The sensor according to the invention, Fig. 2, can be obtained by a modification of the above-described conventional sensor, whereby the electrode assembly is made tapered. More specifically, the electrode assembly has a conical surface 12, which is formed on the end portion of the insulator 2 between the cathode 1 and the anode 3. Furthermore, a conical surface 13 is formed by the same conicity angle as the conical surface 12 on the inside of the electrode membrane exposing opening 11 of the heating device body 10 is located next to the cathode 1, and the exposing surface of the electrode membrane 5 is reduced. Furthermore, the end of the cathode is near the lower end of a circular, truncated cone formed by the comic surface 13. The electrode membrane 5 extends through the narrow gap between the two conical surfaces 12 and 13.
Såsom framgår av ovanstående beskrivning är arean av värmeanordningskroppens 10 elektrodmembranfriläggande öppning 11 reducerad så, att den frilägger väsentligen endast katoden 1. Sålunda kan hudytan värmas likformigt, vilket medför stabil mätning med hög noggrannhet. Arean för beröring mellan hud- ytan och elektrodmembranet 5 är mindre, d.v.s. huden kan täckas av värmeanordningskroppen 10, som är utdragen till nära katoden 1. Huden kommer därför icke att i avsevärd mån höjas in i den elektrodmembranfriläggande öppningen 11. Följ- aktligen förskjutes icke elektrodmembranet 5, d.vÄs. tjock- leken av elektrolytens 8 skikt förblir väsentligen oförändrad, vilket ger mätning med hög noggrannhet.As can be seen from the above description, the area of the electrode membrane exposing opening 11 of the heating device body 10 is reduced so that it exposes substantially only the cathode 1. Thus, the skin surface can be heated uniformly, which results in stable measurement with high accuracy. The area of contact between the skin surface and the electrode membrane 5 is smaller, i.e. the skin can be covered by the heating device body 10, which is extended to near the cathode 1. The skin will therefore not be significantly raised into the electrode membrane exposing opening 11. Consequently, the electrode membrane 5 is not displaced, i.e. the thickness of the layers of the electrolyte 8 remains essentially unchanged, which gives measurement with high accuracy.
Eftersom elektrodaggregatets änddel är konisk, kan elektrodmembranet 5 likformigt spridas över elektrodaggregat- ets änddel. Följaktligen kan svårigheten med att endast en del eller delar av elektrodmembranet 5 sprides elimineras. I en- lighet härmed förblir elektrodmembranets syrepermeabilitet likformig, vilket leder till stabil mätning.Since the end portion of the electrode assembly is conical, the electrode membrane 5 can be uniformly spread over the end portion of the electrode assembly. Consequently, the difficulty of spreading only a part or parts of the electrode membrane 5 can be eliminated. Accordingly, the oxygen permeability of the electrode membrane remains uniform, leading to stable measurement.
Den beskrivna utföringsformen av uppfinningen kan på många sätt modifieras och varieras inom ramen för denna.The described embodiment of the invention can be modified and varied within the scope thereof in many ways.
Claims (5)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6337178U JPS5613933Y2 (en) | 1978-05-12 | 1978-05-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7904172L SE7904172L (en) | 1979-11-13 |
SE439068B true SE439068B (en) | 1985-05-28 |
Family
ID=13227350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7904172A SE439068B (en) | 1978-05-12 | 1979-05-11 | TRANSCUTANIC ACID CONCENTRATION METHOD SENSOR |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5613933Y2 (en) |
DE (1) | DE2919118C3 (en) |
FR (1) | FR2430218B1 (en) |
GB (1) | GB2020819B (en) |
SE (1) | SE439068B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5613935Y2 (en) * | 1978-05-18 | 1981-04-01 | ||
DE3279860D1 (en) * | 1981-10-13 | 1989-09-14 | Radiometer As | Method for transcutaneous measurement of a blood parameter and an electrochemical measuring electrode device for carrying out the method |
JPH0751126B2 (en) * | 1986-12-05 | 1995-06-05 | 住友電気工業株式会社 | Percutaneous blood gas sensor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3334623A (en) * | 1964-11-02 | 1967-08-08 | Beckman Instruments Inc | Electrochemical transducer |
DE2640987C3 (en) * | 1976-09-11 | 1982-06-09 | Drägerwerk AG, 2400 Lübeck | Transducer for the transcutaneous measurement of gases in the blood |
GB1587880A (en) * | 1976-12-29 | 1981-04-08 | Hagihara B | Oxygen measuring electrode assembly |
GB2003275B (en) * | 1977-08-24 | 1982-05-19 | Hagihara B | Oxygen measuring electrode assembly |
-
1978
- 1978-05-12 JP JP6337178U patent/JPS5613933Y2/ja not_active Expired
-
1979
- 1979-05-02 GB GB7915343A patent/GB2020819B/en not_active Expired
- 1979-05-11 FR FR7912043A patent/FR2430218B1/en not_active Expired
- 1979-05-11 DE DE19792919118 patent/DE2919118C3/en not_active Expired
- 1979-05-11 SE SE7904172A patent/SE439068B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB2020819B (en) | 1982-08-18 |
FR2430218B1 (en) | 1985-06-07 |
DE2919118A1 (en) | 1979-11-22 |
GB2020819A (en) | 1979-11-21 |
FR2430218A1 (en) | 1980-02-01 |
DE2919118B2 (en) | 1980-12-18 |
JPS54175388U (en) | 1979-12-11 |
JPS5613933Y2 (en) | 1981-04-01 |
SE7904172L (en) | 1979-11-13 |
DE2919118C3 (en) | 1983-12-15 |
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