DE19532332A1 - Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement - Google Patents

Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement

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Publication number
DE19532332A1
DE19532332A1 DE19532332A DE19532332A DE19532332A1 DE 19532332 A1 DE19532332 A1 DE 19532332A1 DE 19532332 A DE19532332 A DE 19532332A DE 19532332 A DE19532332 A DE 19532332A DE 19532332 A1 DE19532332 A1 DE 19532332A1
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Prior art keywords
pressure
water
zero point
diaphragm
measurement
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DE19532332A
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German (de)
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Michael Petermeyer
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Individual
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Individual
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Priority to DE19532332A priority Critical patent/DE19532332A1/en
Publication of DE19532332A1 publication Critical patent/DE19532332A1/en
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Classifications

    • 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
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
    • A61B5/023—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure transducers comprising a liquid column
    • 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
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
    • A61B5/02156—Calibration means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/02—Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means

Abstract

The compensation system involves a diaphragm differential pressure meter, one diaphragm side of which faces the pressure to be measured via a measurement hose (3), and the other diaphragm side of which has a connection to a hose (5) filled with water, the water level of which, lies at the same level (6) as the place, at which the pressure is measured. An elimination of the zero point deviation by hydrostatic pressure with the measuring of pressure values, is attained by the connection of a differential pressure meter with a system of communication pipes filled with water. The water in this system is separated from the pressure metering diaphragm of the differential pressure meter by air (8).

Description

Problemproblem

Während Operationen oder auf Intensivstationen ist die direkte Messung von Blutdruckwerten (z. B. arterieller oder venöser Blutdruck) wichtiger Bestandteil der Überwachung. Hierzu wird der Katheter, der das Drucksignal aufnimmt, über einen mit Kochsalzlösung gefüllten Schlauch mit einem Druckwandler verbunden, der den Druck in ein elektrisches Signal umsetzt. Zur Messung ist die Festlegung eines externen Nullpunktes Voraussetzung, der sich z. B. in Höhe des rechten Vorhofes des Herzens befindet. Dazu wird der Wandler auf Höhe des rechten Vorhofes befestigt und der Atmosphärendruck gleich Null gesetzt.During surgery or in intensive care units is the direct measurement of Blood pressure values (e.g. arterial or venous blood pressure) are an important part of the Monitoring. For this purpose, the catheter, which receives the pressure signal, is connected via a Saline-filled tubing connected to a pressure transducer that measures the pressure converted into an electrical signal. An external measurement is required for the measurement Zero point requirement, which z. B. at the level of the right atrium of the heart located. To do this, the transducer is attached at the level of the right atrium and the Atmospheric pressure set to zero.

Während Operationen kann der Patient mehrfach umgelagert werden. Nach jeder Umlagerung muß der Wandler erneut auf Höhe des rechten Vorhofes einjustiert werden, da sonst der hydrostatische Druck in der mit Wasser gefüllten Meßleitung zu Falschmessungen führen würde. Diese können dramatische Konsequenzen für das Verhalten des Anästhesisten und damit für den Patienten haben.The patient can be repositioned several times during operations. After every Relocation must be adjusted again at the level of the right atrium be otherwise the hydrostatic pressure in the measuring line filled with water Wrong measurements would result. These can have dramatic ramifications for the Behavior of the anesthetist and thus for the patient.

Stand der TechnikState of the art

  • - Üblicherweise wird die Vorhofhöhe abgeschätzt und der Wandler, der an einem Infusionshalter befestigt ist, in die entsprechende Position gebracht. Nach Umlagerung des Patienten wird der Wandler manuell nachgeführt.- Usually the atrial height is estimated and the transducer connected to one Infusion holder is attached, placed in the appropriate position. After relocation of the patient, the converter is adjusted manually.
  • - Auf Intensivstationen wird die abgeschätzte Vorhofhöhe auf der Brustwand markiert und der Druckwandler mit einer handelsüblichen Wasserwaage einjustiert.- The estimated atrial height is marked on the chest wall in intensive care units and the pressure transducer is adjusted using a standard spirit level.
  • - Die direkte Befestigung des Wandlers an der Thoraxwand scheitert an praktischen Erwägungen, da der Patient häufig mit sterilen Tüchern abgedeckt ist und der Druckwandler zugänglich bleiben muß.- The direct attachment of the transducer to the chest wall fails due to practical Considerations as the patient is often covered with sterile wipes and the Pressure converter must remain accessible.
  • - Katheter der neuen Generation verfügen am distalen Ende über einen Druckwandler, werden aber wegen der hohen Kosten (ca. 2000 DM) selten eingesetzt.- New generation catheters have a pressure transducer at the distal end, but are rarely used because of the high costs (approx. 2000 DM).

Fundstelle: DE 29 30 869 C2, DE 34 05 086 A1, DE-AS 15 66 140, DD 40 033, WO 92/12742 Find: DE 29 30 869 C2, DE 34 05 086 A1, DE-AS 15 66 140, DD 40 033, WO 92/12742  

Lösungsolution

Das System besteht aus einem hydraulischen Teil und einem Differenzdruckwandler. Der hydraulische Teil besteht aus einem ca. 10 ml fassendes Reservoir, das mit Wasser gefüllt und an der Thoraxwand in Vorhofhöhe (also dem externen Nullpunkt) befestigt wird. Am Reservoir ist ein abführender Schlauch befestigt, indem der Wasserspiegel (nach dem Prinzip der kommunizierenden Röhren) immer die gleiche Höhe wie im Reservoir hat. Das System läßt sich einfach mit einem handelsüblichen Infusionsbesteck realisieren.The system consists of a hydraulic part and a differential pressure converter. The hydraulic part consists of an approx. 10 ml reservoir with water filled and on the chest wall at atrial height (i.e. the external zero point) is attached. A draining hose is attached to the reservoir by the Water level (according to the principle of communicating tubes) always the same Height as in the reservoir. The system is easy to use with a commercially available one Realize infusion sets.

Bei Patientenumlagerungen wird die Höhe des Reservoir verändert und es tritt im abführenden Schlauch ein hydrostatischer Druck auf. Dieser Druck ist in Betrag und Vorzeichen identisch mit dem hydrostatischen Druck, der in der Meßleitung entsteht und die Messung verfälscht. Wenn beide Druckwerte voneinander subtrahiert werden, ist das Ergebnis immer Null.When moving patients, the height of the reservoir is changed and it occurs in the discharge hose to a hydrostatic pressure. This pressure is in amount and Sign identical to the hydrostatic pressure that arises in the measuring line and falsified the measurement. If both pressure values are subtracted from each other, the result is always zero.

Die Subtraktion erfolgt durch einen Differenzdruckwandler. Hierzu wird das Drucksignal der Meßleitung auf die eine Seite der druckregistrierenden Membran gebracht. Die andere Membranseite ist mit dem Schlauchende des hydraulischen Teils verbunden. Zu Beginn der Operation wird das Reservoirgefäß auf rechter Vorhofhöhe an der Thoraxwand fixiert und der Druckwandler in ebenderselben Höhe an z. B. einem Infusionshalter befestigt. Jetzt erfolgt die Nullpunktkalibrierung gegen Atmosphärendruck. Dazu wird die Meßleitung zum Patienten hin verschlossen und der Druckwandler zur Außenluft hin geöffnet. Üblicherweise geschieht dieses durch einen Dreiwegehahn.The subtraction is carried out by a differential pressure converter. For this, the Pressure signal from the measuring line to one side of the pressure-registering membrane brought. The other diaphragm side is with the hose end of the hydraulic part connected. At the beginning of the operation, the reservoir vessel is at the right atrial level fixed to the chest wall and the pressure transducer at exactly the same height on z. B. one Infusion holder attached. Now the zero point calibration against atmospheric pressure takes place. For this purpose, the measuring line is closed to the patient and the Pressure transducer open to the outside air. This is usually done by one Three-way cock.

Von nun an kann der Patient beliebig umgelagert werden ohne daß es zu einer Fehlmessung durch Höhenunterschiede kommt.From now on, the patient can be rearranged as desired without it becoming one Incorrect measurement due to height differences.

Beim Anschluß des hydraulischen Teiles an den Druckwandler soll das Wasser durch ein Luftpolster von der druckregistrierenden Membran isoliert sein. Damit werden elektrische Probleme vermieden und die Messung weniger gedämpft.When connecting the hydraulic part to the pressure transducer, the water should flow through an air cushion must be isolated from the pressure-registering membrane. With that electrical problems avoided and the measurement less damped.

Erreichte VorteileAchieved advantages

  • - Das Nachführen des Druckwandlers während Umlagerung von Patienten entfällt.- The pressure transducer does not have to be adjusted while patients are being transferred.
  • - Erhöhte Patientensicherheit, da Fehlmessungen durch Höhenunterschiede zwischen Patient und Druckwandler nicht auftreten.- Increased patient safety due to incorrect measurements due to height differences between Patient and pressure transducer do not occur.
  • - Einfache Realisation bei den üblicherweise verwendeten Piezo-Druckwandlern.- Simple implementation with the commonly used piezo pressure transducers.
  • - Entlastung des Anästhesisten.- Relief for the anesthetist.
  • - Kein zusätzliches Müllaufkommen, da der hydraulische Teil wiederverwendet werden kann. Er muß nicht einmal steril sein.- No additional waste, since the hydraulic part can be reused can. It doesn't even have to be sterile.
Weitere Ausgestaltung der ErfindungFurther embodiment of the invention

Die häufig verwendeten Einwegdruckwandlern sind durch eine minimale Änderung des Gehäuses als Differenzdruckwandler zu verwenden. Da der Innenraum des Gehäuses Verbindung zur Gegenseite der druckregistrierenden Membran hat, reicht eine Abdichtung des Gehäuses und das Abbringen eines normierter Anschluß (Luer-Lock) zum Anschluß des hydraulischen Teiles zur Realisierung aus.The commonly used disposable pressure transducers are characterized by a minimal change in the To use the housing as a differential pressure converter. Because the interior of the housing A connection is sufficient to the opposite side of the pressure-registering membrane Sealing of the housing and removal of a standardized connection (Luer lock) to connect the hydraulic part for implementation.

Ein Schutz der druckregistrierenden Membran gegen eindringendes Wasser aus der Wasserwaage wäre eine Watte oder ein Filter. Protection of the pressure-registering membrane against water ingress from the Spirit level would be a cotton ball or a filter.  

Beschreibung eines AusführungsbeispielesDescription of an embodiment

In den folgenden Abbildungen wird ein Ausführungsbeispiel der Erfindung erläutert:An exemplary embodiment of the invention is explained in the following figures:

Abb. 1 Patienten mit korrekt einjustiertem Druckwandler, Fig. 1 Patients with a correctly adjusted pressure transducer,

Abb. 2 hochgelagerter Patient, Fig. 2 elevated patient,

Abb. 3 Blockbild eines handelsüblichen Piezo-Einwegdruckwandlers, Fig. 3 Block diagram of a commercially available piezo disposable pressure transducer,

Abb. 4 Erfindung. Fig. 4 Invention.

Abb. 1 zeigt die bisher geübte Praxis der Druckmessung: einen Patienten (1) mit korrekt auf Höhe des externen Nullpunktes (Vorhofhöhe) einjustiertem Druckwandler (2). Ein z. B. zentraler Katheter in der Vena Basilica des Patienten ist über die Meßleitung (3) mit dem Transducer verbunden. Der Überwachungsmonitor (4) zeigt einen zentralvenösen Druck (ZVD) von 5 mm Hg an. Fig. 1 shows the previous practice of pressure measurement: a patient ( 1 ) with the pressure transducer ( 2 ) correctly adjusted at the external zero point (atrial height). A z. B. central catheter in the patient's vena basilica is connected to the transducer via the measuring line ( 3 ). The monitoring monitor ( 4 ) shows a central venous pressure (ZVD) of 5 mm Hg.

Der mit Wasser gefüllte hydraulische Teil der Erfindung besteht aus einem Schlauch (5) und einem Wasserreservoir (6), welches auf Höhe des rechten Vorhofes des Herzens befestigt ist. Die obere Meßkammer des Wandlers ist zuvor zur Atmosphäre hin geöffnet und der gemessene Druck auf Null gesetzt worden (Nullpunktkalibrierung).The hydraulic part of the invention filled with water consists of a tube ( 5 ) and a water reservoir ( 6 ) which is attached at the level of the right atrium of the heart. The upper measuring chamber of the transducer has previously been opened to the atmosphere and the measured pressure has been set to zero (zero point calibration).

In Abb. 2 ist der Patient (1) um 13 cm höher gelagert worden. Da der Druckwandler (2) nicht nachgeführt wurde, ergibt sich ein gemessener Druckwert, der um den Betrag des hydrostatischen Druckes in der Meßleitung zu hoch ist. 13 cm Wassersäule entsprechen etwa 10 mm Hg.In Fig. 2 the patient ( 1 ) has been positioned 13 cm higher. Since the pressure transducer ( 2 ) was not tracked, a measured pressure value results which is too high by the amount of the hydrostatic pressure in the measuring line. 13 cm water column correspond to about 10 mm Hg.

Abb. 3 zeigt ein Blockbild eines handelsüblichen Piezo-Einwegdruckwandlers. Die Unterseite der Meßmembran (7) ist zur Atmosphäre hin offen. Über die mit Wasser gefüllte Meßleitung (3) wird dem Druckwandler das Drucksignal zugeführt und in Spannungswerte umgesetzt. Fig. 3 shows a block diagram of a commercially available piezo disposable pressure transducer. The underside of the measuring membrane ( 7 ) is open to the atmosphere. The pressure signal is fed to the pressure transducer via the measuring line ( 3 ) filled with water and converted into voltage values.

Abb. 4 zeigt die Erfindung. Der Patient (1) ist wie in Abb. 2 um 13 cm höher gelagert. Durch den Anschluß des hydraulischen Teiles (5) an den Druckwandler (2), der jetzt als Differenzdruckwandler arbeitet, kommt es zu keiner Falschmessung. Fig. 4 shows the invention. The patient ( 1 ) is positioned 13 cm higher as in Fig. 2. By connecting the hydraulic part ( 5 ) to the pressure transducer ( 2 ), which now works as a differential pressure transducer, there is no incorrect measurement.

Der angezeigte Druck entspricht dem real vorherrschenden Venendruck. Der die Fehlmessung verursachende hydrostatische Druck wird beiden Seiten der Meßmembran (7) des Transducers (2) zugeführt, so daß sich beide Drücke zu Null kompensieren. Der hydraulische Teil ist vom Transducer durch eine Luftblase (8) getrennt.The pressure displayed corresponds to the real prevailing venous pressure. The hydrostatic pressure causing the incorrect measurement is fed to both sides of the measuring membrane ( 7 ) of the transducer ( 2 ), so that both pressures compensate for zero. The hydraulic part is separated from the transducer by an air bubble ( 8 ).

Voraussetzung für eine korrekte Messung ist die Nullpunktkalibrierung mit angeschlossenem hydraulischem Teil.The zero point calibration with is a prerequisite for a correct measurement connected hydraulic part.

Claims (3)

1. Vorrichtung, dadurch gekennzeichnet, daß eine Eliminierung von Nullpunktsabweichungen durch hydrostatischen Druck bei der Messung von Druckwerten durch die Verwendung eines Membran-Differenzdruckmessers realisiert wird, dessen eine Membranseite dem zu messenden Druck zugewandt ist und dessen andere Membranseite Verbindung zu einem mit Wasser gefüllten Schlauch hat, dessen Wasserspiegel auf gleicher Höhe wie der Ort liegt, an dem der Druck gemessen wird.1. Device, characterized in that an elimination of zero point deviations by hydrostatic pressure in the measurement of pressure values is realized by using a diaphragm differential pressure meter, one side of the diaphragm facing the pressure to be measured and the other side of the diaphragm connection to a hose filled with water whose water level is at the same level as the place where the pressure is measured. 2. Vorrichtung, dadurch gekennzeichnet, daß eine Eliminierung von Nullpunktsabweichungen durch hydrostatischen Druck bei der Messung von Druckwerten durch die Verbindung eines Differenzdruckmessers mit einem System von mit Wasser gefüllten, kommunizierenden Röhren erreicht wird.2. Device, characterized in that an elimination of Zero point deviations due to hydrostatic pressure when measuring Pressure values by connecting a differential pressure meter with a System of communicating tubes filled with water. 3. Vorrichtung, dadurch gekennzeichnet, daß sie Schutzanspruch 2 erfüllt und das Wasser in dem System von kommunizierenden Röhren von der druckaufnehmenden Membran des Differenzdruckmessers durch Luft (8) getrennt ist.3. Device, characterized in that it meets protection claim 2 and the water in the system of communicating tubes is separated from the pressure-receiving membrane of the differential pressure meter by air ( 8 ).
DE19532332A 1994-09-03 1995-08-31 Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement Withdrawn DE19532332A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19532332A DE19532332A1 (en) 1994-09-03 1995-08-31 Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9414309U DE9414309U1 (en) 1994-09-03 1994-09-03 Device for eliminating zero point deviations by hydrostatic pressure in the measurement of blood pressure values in humans
DE19532332A DE19532332A1 (en) 1994-09-03 1995-08-31 Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement

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DE19532332A1 true DE19532332A1 (en) 1996-04-11

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DE9414309U Expired - Lifetime DE9414309U1 (en) 1994-09-03 1994-09-03 Device for eliminating zero point deviations by hydrostatic pressure in the measurement of blood pressure values in humans
DE19532332A Withdrawn DE19532332A1 (en) 1994-09-03 1995-08-31 Compensation system for eliminating zero point deviations caused by hydrostatic pressure during e.g. blood pressure measurement

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DE9414309U Expired - Lifetime DE9414309U1 (en) 1994-09-03 1994-09-03 Device for eliminating zero point deviations by hydrostatic pressure in the measurement of blood pressure values in humans

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005032364A1 (en) * 2003-10-07 2005-04-14 Mondo Medical Limited Position monitoring apparatus
DE102005037995A1 (en) * 2005-08-09 2007-02-15 Endress + Hauser Gmbh + Co. Kg Pressure unit testing unit for industrial technique, has connection units between which pressure unit is clamped, and evaluation unit to determine pressure unit characteristics based on hydrostatic pressure and differential pressure
WO2009152118A1 (en) * 2008-06-09 2009-12-17 Gentera Holdings, Llc Pressure sensing catheter
WO2014135457A3 (en) * 2013-03-04 2014-10-30 Andromeda Medizinische Systeme Gmbh Pressure-measuring system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29504674U1 (en) * 1995-03-18 1995-05-24 Braun Melsungen Ag Device for invasive pressure measurement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1566140B1 (en) * 1967-07-22 1970-03-26 Pfrimmer & Co J Device for setting the zero point of venous pressure measuring devices
US4185641A (en) * 1978-08-23 1980-01-29 Hewlett-Packard Company Pressure dome
DE3405086A1 (en) * 1984-02-14 1984-08-30 H.Walter Dr. 1000 Berlin Striebel Simple apparatus for continuous invasive measurement of the arterial blood pressure (as well as other liquid pressures)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005032364A1 (en) * 2003-10-07 2005-04-14 Mondo Medical Limited Position monitoring apparatus
DE102005037995A1 (en) * 2005-08-09 2007-02-15 Endress + Hauser Gmbh + Co. Kg Pressure unit testing unit for industrial technique, has connection units between which pressure unit is clamped, and evaluation unit to determine pressure unit characteristics based on hydrostatic pressure and differential pressure
WO2009152118A1 (en) * 2008-06-09 2009-12-17 Gentera Holdings, Llc Pressure sensing catheter
US8192368B2 (en) 2008-06-09 2012-06-05 Gentera Holdings, Llc Pressure sensing catheter
WO2014135457A3 (en) * 2013-03-04 2014-10-30 Andromeda Medizinische Systeme Gmbh Pressure-measuring system

Also Published As

Publication number Publication date
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