DE2843143B1 - Device for measuring peripheral circulation - Google Patents

Device for measuring peripheral circulation

Info

Publication number
DE2843143B1
DE2843143B1 DE2843143A DE2843143A DE2843143B1 DE 2843143 B1 DE2843143 B1 DE 2843143B1 DE 2843143 A DE2843143 A DE 2843143A DE 2843143 A DE2843143 A DE 2843143A DE 2843143 B1 DE2843143 B1 DE 2843143B1
Authority
DE
Germany
Prior art keywords
heating element
temperature
measuring probe
measuring
skin
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.)
Withdrawn
Application number
DE2843143A
Other languages
German (de)
Inventor
Andras Gedeon
Georgi Psaros
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE2843143A priority Critical patent/DE2843143B1/en
Publication of DE2843143B1 publication Critical patent/DE2843143B1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/01—Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/026—Measuring blood flow
    • 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
    • A61B5/1491—Heated applicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6847—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow where sensing or heating elements are not disturbing the fluid flow, e.g. elements mounted outside the flow duct
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Surgery (AREA)
  • Public Health (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Veterinary Medicine (AREA)
  • Automation & Control Theory (AREA)
  • Hematology (AREA)
  • Cardiology (AREA)
  • Physiology (AREA)
  • Optics & Photonics (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Description

Die Einstellung soll so erfolgen, daß die Temperatur des Heizelementes um einen konstanten Wert von etwa 2 bis 30C über der Hauttemperatur, d. h. 2 bis 30C über der Temperatur der Meßsonde 7, liegt. Dies erfolgt mittels eines Stromgenerators 12, der über die Verbindung 15 dem Heizelement 4 Strom zuführt, bis dessen Temperatur 2 bis 30C über der Hauttemperatur liegt. Diese Temperatur herrscht auch an der wärmeleitenden Platte 6 und wird dadurch auf die Haut übertragen. Der Blutstrom unter der Platte 6 nimmt die Wärme mit und die Platte 6 bzw. das Heizelement werden abgekühlt. Die Meßsonde 5, die in thermischem und mechanischem Kontakt mit dem Heizelement 4 steht, ist ein Istwertgeber in dem Regelkreis für die Temperatur des Heizelementes 4. Wenn das Heizelement 4 abgekühlt wird, kühlt auch die Meßsonde 5 entsprechend ab. Ein der Abkühlung entsprechendes elektrisches Signal wird im Punkt 10 abgegriffen und dem einen Eingang eines Differenzverstärkers 13 zugeführt. Gleichzeitig wird die Hauttemperatur durch die Meßsonde 7 über die ihr zugeordnete Platte 8 gemessen und ein dieser Temperatur entsprechendes Signal im Punkt 11 abgegriffen und dem zweiten Eingang des Differenzverstärkers 13 zugeleitet. Die Differenz der dem Differenzverstärker 13 zugeführten Signale wird nun über die Verbindung 14 dem Stromgenerator 12 zugeleitet, der bewirkt, daß die Temperatur des Heizelements 4 immer um den konstanten Wert von 2 bis 30C über der Temperatur der Meßsonde 7 liegt An der Verbindung 14 ist eine weitere Verbindung 16 ein Meßgerät 17 angeschaltet. Das Meßgerät 17 mißt die jeweilige Leistung, die für die Aufwärmung des Heizelements 4 gebraucht wird. Diese Leistung ist proportional zur peripheren Zirkulation des Blutes. Auf diese Weise kann kontinuierlich der Temperaturabfall vom Heizelement zur Meßsonde erfaßt werden.The setting should be made so that the temperature of the heating element by a constant value of about 2 to 30C above the skin temperature, i.e. H. 2 to 30C above the temperature of the measuring probe 7 is. This is done by means of a power generator 12, which supplies power to the heating element 4 via the connection 15 until its temperature 2 to 30C above skin temperature. This temperature also prevails at the thermally conductive one Plate 6 and is thereby transferred to the skin. The flow of blood under the plate 6 takes the heat with it and the plate 6 or the heating element are cooled. the Measuring probe 5, which is in thermal and mechanical contact with the heating element 4, is an actual value transmitter in the control circuit for the temperature of the heating element 4. If the heating element 4 is cooled down, the measuring probe 5 also cools down accordingly. A The electrical signal corresponding to the cooling is tapped in point 10 and fed to one input of a differential amplifier 13. At the same time, the Skin temperature measured by the measuring probe 7 via the plate 8 assigned to it and a signal corresponding to this temperature is tapped at point 11 and the second The input of the differential amplifier 13 is supplied. The difference in the differential amplifier 13 is now fed to the power generator 12 via the connection 14, which causes the temperature of the heating element 4 to always be around the constant value from 2 to 30C above the temperature of the Measuring probe 7 is on the connection 14, a further connection 16, a measuring device 17 is connected. The measuring device 17 measures the respective power required to warm up the heating element 4 will. This power is proportional to the peripheral circulation of the blood. on In this way, the temperature drop from the heating element to the measuring probe can be continuous can be detected.

Aufgrund des einfachen Aufbaus des Gerätes kann es klein gehalten werden und ist deshalb für Batteriebetrieb geeignet.Due to the simple structure of the device, it can be kept small and is therefore suitable for battery operation.

Claims (3)

Patentansprüche: 1. Gerät zur Messung der peripheren Zirkulation, bei dem zur Registrierung der externen Wärmeableitung aufgrund der Hautdurchblutung ein Heizelement und eine Meßsonde für die Temperatur an einer im Abstand von der Heizstelle liegenden Meßstelle vorhanden sind, dadurch gekennz e i c h n e t, daß in thermischem Kontakt mit dem Heizelement (4) eine weitere Meßsonde (5) vorgesehen ist, die der Istwertgeber in einem Regelkreis (F i g. 2) für die Temperatur des Heizelementes (4) ist. Claims: 1. Device for measuring peripheral circulation, in the case of registering the external heat dissipation due to the blood circulation in the skin a heating element and a measuring probe for the temperature at a distance from the Measuring point lying on the heating point are present, characterized in that a further measuring probe (5) is provided in thermal contact with the heating element (4) is that the actual value transmitter in a control loop (F i g. 2) for the temperature of the Heating element (4) is. 2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß das Heizelement (4) und die ihm zugeordnete Meßsonde (5) auf einer gemeinsamen wärmeleitenden Platte (6) und die im Abstand angeordnete Meßsonde (7) auf einer weiteren wärmeleitenden Platte (8) angeordnet sind und daß die wärmeleitenden Platten (6, 8) Bestandteil eines Applikators (1) sind. 2. Apparatus according to claim 1, characterized in that the heating element (4) and the measuring probe (5) assigned to it on a common heat-conducting plate (6) and the spaced-apart measuring probe (7) on another thermally conductive one Plate (8) are arranged and that the thermally conductive plates (6, 8) part of an applicator (1). 3. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Heizelement (4) an einem Stromgenerator (12) mit einstellbarer Leistung angeschlossen ist, der von einem die Differenz zwischen der Temperatur des Heizelements (4) und der im Abstand angeordneten Meßsonde (7) erfassenden Differenzverstärker (13) im Sinne einer Konstanthaitung der Temperaturdifferenz angesteuert wird, und daß ein Meßgerät (17) für die jeweilige Heizleistung vorhanden ist. 3. Apparatus according to claim 1 or 2, characterized in that the Heating element (4) connected to a power generator (12) with adjustable power is that of one the difference between the temperature of the heating element (4) and the spaced-apart measuring probe (7) detecting differential amplifier (13) in the The sense of a constant the temperature difference is controlled, and that a Measuring device (17) for the respective heating power is available. Die Erfindung geht aus von einem Gerät zur Messung der peripheren Zirkulation, bei dem zur Registrierung der externen Wärmeableitung aufgrund der Hautdurchblutung ein Heizelement und eine Meßsonde für die Temperatur an einer im Abstand von der Heizstelle liegenden Meßstelle vorhanden sind. The invention is based on a device for measuring the peripheral Circulation, in which to register the external heat dissipation due to the Skin circulation a heating element and a measuring probe for the temperature at an im Distance from the measuring point located at the heating point. Es ist ein Gerät dieser Art durch die Zeitschrift »Journal of Applied Physiology« Vor.39, No.l, July 1975, Seiten 170 bis 173 bekannt. Das Heizelement und die Meßsonde werden dabei z. B. auf einer Fingerspitze eines Patienten appliziert. Die Meßsonde mißt die Hauttemperatur. Das Heizelement wird 1 ms bis auf eine bestimmte Temperatur aufgeheizt und wärmt dadurch die Haut an der darunter liegenden Stelle. There is a device of this type by the Journal of Applied Physiology "Vor.39, No. 1, July 1975, pages 170-173 known. The heating element and the probe are thereby z. B. applied to a patient's fingertip. The measuring probe measures the skin temperature. The heating element is 1 ms down to a certain one Temperature and thereby warms the skin in the underlying area. Wenn das Blut an dieser Stelle unter der Haut durchströmt, nimmt es einen Teil der Hautwärme mit und das Heizelement kühlt ab. Nach 1 ms wird im Gerät die Differenz zwischen der Temperatur der Meßsonde und der Temperatur des Heizelements gemessen und registriert. Danach wird das Heizelement wieder 1 ms aufgeheizt und das Meßverfahren wiederholt Wenn die Durchblutung z.B. aufgrund einer Bewegung eines Patienten erhöht wird, muß das Gerät das Heizelement so steuern, daß es nach 1 ms das bestimmte Temperaturniveau, das für alle Messungen gleich ist, erreicht. Die Leistung, die erforderlich ist, um die Temperatur des Heizelements auf das bestimmte Temperaturniveau zu bringen, ist ein Maß für die periphere Zirkulation. Diese Regelung des Temperaturniveaus erfordert einen komplizierten Aufbau des Gerätes. Ein weiterer Nachteil des Gerätes liegt darin, daß das Heizelement auch zur Messung der Temperaturdifferenz dient, so daß eine diskontinuierliche Messung der peripheren Zirkulation eines Patienten erfolgt.When the blood flows under the skin at this point, it increases part of the skin's heat and the heating element cools down. After 1 ms, the device the difference between the temperature of the measuring probe and the temperature of the heating element measured and registered. The heating element is then heated up again for 1 ms and the measuring procedure is repeated Patient is increased, the device must control the heating element so that it is after 1 ms the certain temperature level, which is the same for all measurements, is reached. the Power that is required to bring the temperature of the heating element to the specific Bringing the temperature level is a measure of the peripheral circulation. This regulation the temperature level requires a complicated structure of the device. Another The disadvantage of the device is that the heating element is also used to measure the temperature difference serves, so that a discontinuous measurement of the peripheral circulation of a patient he follows. Der Erfindung liegt die Aufgabe zugrunde, ein Gerät der eingangs genannten Art zu schaffen, das in einer einfachen Weise kontinuierlich den Temperaturabfall vom Heizelement zur Meßsonde erfaßt. The invention has for its object to provide a device of the initially called type to create that in a simple way continuously the temperature drop detected by the heating element to the measuring probe. Diese Aufgabe ist erfindungsgemäß bei einem Gerät der angegebenen Gattung dadurch gelöst, daß in thermischem Kontakt mit dem Heizelement eine weitere Meßsonde vorgesehen ist, die der Istwertgeber in einem Regelkreis für die Temperatur des Heizelementes ist. Aufgrund der Tatsache, daß eine Meßsonde vorhanden ist, die das Heizelement auf einem konstanten Temperaturniveau hält, kann eine kontinuierliche Messung der peripheren Zirkulation eines Patienten erfolgen. According to the invention, this object is given in the case of a device Genus solved in that another in thermal contact with the heating element Measuring probe is provided, which the actual value transmitter in a control circuit for the temperature of the heating element. Due to the fact that there is a measuring probe that Keeping the heating element at a constant temperature level can be continuous Measurement of the peripheral circulation of a patient can be done. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben. Advantageous further developments of the invention are set out in the subclaims specified. Die Erfindung ist anhand eines in den Figuren dargestellten Ausführungsbeispiels näher erläutert. Es zeigt Fig. 1 einen Schnitt durch den Applikator des Gerätes und F i g. 2 ein Schaltbild des Gerätes. The invention is based on an embodiment shown in the figures explained in more detail. 1 shows a section through the applicator of the device and F i g. 2 a circuit diagram of the device. F i g. 1 zeigt einen Applikator 1, der auf einer Fingerspitze 2 eines Patienten zur Messung der peripheren Zirkulation des Blutes angebracht ist. Der Applikator 1 ist über eine Leitung 3 mit einer in der F i g. 2 näher beschriebenen Schaltungsanordnung des Gerätes verbunden. In dem Applikator 1 ist ein Heizelement 4 und eine ihm zugeordnete Meßsonde 5 auf einer gemeinsamen, an der Haut der Fingerspitze 2 anliegenden, wärmeleitenden Platte 6 angeordnet. In dem Applikator 1 ist eine weitere Meßsonde 7 auf einer ebenfalls an der Haut der Fingerspitze 2 anliegenden wärmeleitenden Platte 8 angebracht. F i g. 1 shows an applicator 1, which is on a fingertip 2 of a Patient to measure the peripheral circulation of the blood is appropriate. Of the Applicator 1 is connected via a line 3 to a device shown in FIG. 2 described in more detail Circuit arrangement of the device connected. In the applicator 1 is a heating element 4 and a measuring probe 5 assigned to it on a common one on the skin of the fingertip 2 adjacent, thermally conductive plate 6 is arranged. In the applicator 1 is a further measuring probe 7 on a likewise resting against the skin of the fingertip 2 heat conductive plate 8 attached. Bevor eine Messung der peripheren Zirkulation eines Patienten erfolgt, muß das Gerät geeicht werden. Dies erfolgt bei der Schaltungsanordnung gemäß F i g. 2 mittels eines manuell einstellbaren Potentiometers 9. Before measuring a patient's peripheral circulation, the device must be calibrated. This takes place in the circuit arrangement according to F i G. 2 by means of a manually adjustable potentiometer 9.
DE2843143A 1978-10-03 1978-10-03 Device for measuring peripheral circulation Withdrawn DE2843143B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2843143A DE2843143B1 (en) 1978-10-03 1978-10-03 Device for measuring peripheral circulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2843143A DE2843143B1 (en) 1978-10-03 1978-10-03 Device for measuring peripheral circulation

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DE2843143B1 true DE2843143B1 (en) 1980-03-13

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Application Number Title Priority Date Filing Date
DE2843143A Withdrawn DE2843143B1 (en) 1978-10-03 1978-10-03 Device for measuring peripheral circulation

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3217142A1 (en) * 1982-05-07 1983-11-17 Gerhard Dipl.-Ing. 3500 Kassel Armonies Blood flow measuring device
WO1987007016A1 (en) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Process and circuit for measuring the air flow in the inlet manifold of an internal combustion engine
FR2615385A1 (en) * 1987-05-22 1988-11-25 Centre Nat Rech Scient Apparatus for measuring heat losses from the finger

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3217142A1 (en) * 1982-05-07 1983-11-17 Gerhard Dipl.-Ing. 3500 Kassel Armonies Blood flow measuring device
WO1987007016A1 (en) * 1986-05-09 1987-11-19 Robert Bosch Gmbh Process and circuit for measuring the air flow in the inlet manifold of an internal combustion engine
FR2615385A1 (en) * 1987-05-22 1988-11-25 Centre Nat Rech Scient Apparatus for measuring heat losses from the finger

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