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WO1995014227A1 - Method and device for determining the useful life of disinfection baths - Google Patents

Method and device for determining the useful life of disinfection baths Download PDF

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Publication number
WO1995014227A1
WO1995014227A1 PCT/EP1994/003637 EP9403637W WO9514227A1 WO 1995014227 A1 WO1995014227 A1 WO 1995014227A1 EP 9403637 W EP9403637 W EP 9403637W WO 9514227 A1 WO9514227 A1 WO 9514227A1
Authority
WO
WIPO (PCT)
Prior art keywords
impedance
disinfection
bath
solution
value
Prior art date
Application number
PCT/EP1994/003637
Other languages
German (de)
French (fr)
Inventor
Joachim Klein
Original Assignee
Lang Apparatebau Gmbh
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 Lang Apparatebau Gmbh filed Critical Lang Apparatebau Gmbh
Publication of WO1995014227A1 publication Critical patent/WO1995014227A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/011—Velocity or travel time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/018—Impedance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/022—Liquids
    • G01N2291/0224—Mixtures of three or more liquids

Definitions

  • the invention relates to a method for determining the useful life of disinfection baths according to the preamble of claim 1 and a device for carrying out the method.
  • Disinfection baths for example for instrument disinfection in the clinic area or in doctor's surgeries, are either bought and used ready for use or they are filled into containers or trays ready for use by adding proportionally concentrated products in appropriate dosing devices.
  • Ready-to-use solutions are usually used in 5 percent concentration for the disinfection of instruments, endoscopes and the like. scheduled. The solution is located in a tub or bowl in which the instruments are placed. After a certain minimum exposure time in the range of minutes to hours the biological activities that cause the disinfectant effect have expired and the inserted instruments are considered disinfected. The disinfectant solution is then usually poured out. In the case of instrument disinfection, however, the solution can be used several times, for example over several days. The time of determining the bath change is chosen subjectively. It depends on the assessment of the staff and, if applicable, on in-house hygiene regulations and is also influenced by the desire for economy.
  • the invention is based on the object of specifying a method and a device for recording the useful life of disinfection baths in order to enable constant monitoring of the bath quality by evaluating measurable criteria and to be able to carry out the bath change according to objective criteria.
  • the biological load on the disinfection bath is determined using the method of impedance measurement.
  • a probe that contains at least one electromechanical oscillator is immersed in the bath.
  • Components which generate surface waves by appropriate control (so-called SAW) or also piezoelectric vibrators can be used as vibrators.
  • SAW surface wave by appropriate control
  • the impedance of the oscillation requirement consisting of oscillator and flow liquid determined.
  • the value of this impedance consisting of real part and imaginary part, is stored in an electronic evaluation unit.
  • the impedance value of the solution changes depending on the biological load on the bath, which is caused by contaminated or soiled instruments. If the impedance reaches a critical value, this is displayed in order to achieve a bath change.
  • the change in impedance which occurs with increasing pollution of the bath depends on the type of disinfectant used, on the type of biological load and on the time. Corresponding criteria can be taken into account in the electronic evaluation unit.
  • the control unit generates an electrical alternating voltage of high frequency, which is fed to the oscillator 14.
  • the oscillator 14 is in direct contact with the disinfectant solution 12. As a result of the electrical excitation, it generates mechanical vibrations which are influenced by the bath liquid.
  • the values of current and voltage of the excitation of the vibrator 14 are transmitted from the control unit 15 to a measuring device 16. From the current and voltage values, the measuring device 16 forms the impedance value, which consists of a real part and an imaginary part. The measuring device supplies this impedance value
  • the evaluation unit 17 is a microprocessor to which information 18 about the type of disinfectant used and information 19 about the maximum permissible change in impedance is supplied.
  • the evaluation unit 17 also contains a timer which monitors the maximum permissible service life of the disinfectant solution and issues an alarm if the probe 13 detects a immersed in the disinfectant solution. In this way, the maximum useful life of the disinfectant solution is limited.
  • the timer contained in the evaluation unit 17 After a certain maximum time of use of the bath has elapsed, the timer contained in the evaluation unit 17 generates an alarm, irrespective of the impedance value read, because after the maximum time has elapsed the bath must be changed in any case.

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  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

In order to measure the biological-matter content in a disinfection solution (12), the invention calls for a probe (13) which is immersed in the disinfection bath (10), the probe (13) having at least one electromagnetic oscillator (14) which is in contact with the disinfection solution (12). By exposing the bath to high-frequency mechanical oscillations, the impedance of the oscillating system, consisting of the oscillator (14) and the liquid (12), is determined. The value of this impedance is stored in an electronic processor unit (17). The impedance of the solution varies as a function of the biological-matter content of the solution produced by instruments contaminated with germs or dirt.

Description

Verfahren und Vorrichtung zur Erfassung der Nutzungsdauer von Desinfektionsbädern Method and device for determining the service life of disinfection baths
Die Erfindung betrifft ein Verfahren zur Erfassung der Nutzungsdauer von Desinfektionsbädern nach dem Oberbe¬ griff des Patentanspruchs 1 sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for determining the useful life of disinfection baths according to the preamble of claim 1 and a device for carrying out the method.
Desinfektionsbäder, z.B. für die Instrumenten-Desinfek- tion im Klinikbereich oder in Arztpraxen werden entwe¬ der gebrauchsfertig gekauft und angewendet oder sie werden durch mengenproportionales Zumischen von Konzen¬ trat-Produkten in entsprechenden Dosiergeräten anwen¬ dungsfertig in Behälter oder Schalen abgefüllt. Übli¬ cherweise werden anwendungsfertige Lösungen in 5-pro- zentiger Konzentration für die Desinfektion von Instru¬ menten, Endoskopen u.dgl. angesetzt. Die Lösung befin¬ det sich in einer Wanne oder Schale, in die die Instru¬ mente hineingelegt werden. Nach einer gewissen Mindest- einwirkzeit im Bereich von Minuten bis zu Stunden sind die biologischen Aktivitäten, welche die Desinfektions- wirkung hervorrufen abgelaufen und die eingebrachten Instrumente gelten als desinfiziert. Üblicherweise wird dann die Desinfektionslösung ausgegossen. Bei der In- stru entendesinfektion kann die Lösung hingegen mehr¬ fach benutzt werden, z.B. über mehrere Tage hinweg. Der Zeitpunkt der Bestimmung des Badwechsels wird subjektiv gewählt. Er hängt von der Beurteilung des Personals und ggf. von hausinternen Hygiene-Vorschriften ab und wird zudem vom Wunsch zur Sparsamkeit beeinflußt.Disinfection baths, for example for instrument disinfection in the clinic area or in doctor's surgeries, are either bought and used ready for use or they are filled into containers or trays ready for use by adding proportionally concentrated products in appropriate dosing devices. Ready-to-use solutions are usually used in 5 percent concentration for the disinfection of instruments, endoscopes and the like. scheduled. The solution is located in a tub or bowl in which the instruments are placed. After a certain minimum exposure time in the range of minutes to hours the biological activities that cause the disinfectant effect have expired and the inserted instruments are considered disinfected. The disinfectant solution is then usually poured out. In the case of instrument disinfection, however, the solution can be used several times, for example over several days. The time of determining the bath change is chosen subjectively. It depends on the assessment of the staff and, if applicable, on in-house hygiene regulations and is also influenced by the desire for economy.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Erfassung der Nutzungsdauer von Desinfektionsbädern anzugeben, um durch Auswertung meßbarer Kriterien eine ständige Überwachung der Bad¬ qualität zu ermöglichen und den Badwechsel nach objek¬ tiven Kriterien durchführen zu können.The invention is based on the object of specifying a method and a device for recording the useful life of disinfection baths in order to enable constant monitoring of the bath quality by evaluating measurable criteria and to be able to carry out the bath change according to objective criteria.
Die Lösung dieser Aufgabe erfolgt bei dem Verfahren erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 und bei der Vorrichtung mit den Merkmalen des Patent¬ anspruchs 6.This object is achieved in the method according to the invention with the features of patent claim 1 and in the device with the features of patent claim 6.
Bei dem erfindungsgemäßen Verfahren und der Vorrichtung wird die biologische Belastung des Desinfektionsbades mit der Methode der Impedanzmessung ermittelt. Hierbei wird eine Sonde, die mindestens einen elektromechani- schen Schwinger enthält, in das Bad getaucht. Als Schwinger können Bauelemente verwendet werden, welche durch entsprechende Ansteuerung Oberflächenwelleπ er¬ zeugen (sogenannte SAW) oder auch piezoelektrische Schwinger. Durch Einkopplung der hochfrequenten mecha¬ nischen Schwingungen in das Bad wird die Impedanz der Schwing-Anforderung bestehend aus Schwinger und Flüs- sigkeit ermittelt. Der Wert dieser Impedanz, bestehend aus Realteil und Imaginärteil, wird in einer elektroni¬ schen Auswerteeinheit gespeichert. Der Impedanzwert der Lösung ändert sich in Abhängigkeit von der biologischen Belastung des Bades, welche durch verkeimte oder ver¬ schmutzte Instrumente hervorgerufen wird. Erreicht die Impedanz einen kritischen Wert, so wird dieser zur An¬ zeige gebracht, um einen Badwechsεl zu erreichen.In the method and the device according to the invention, the biological load on the disinfection bath is determined using the method of impedance measurement. Here, a probe that contains at least one electromechanical oscillator is immersed in the bath. Components which generate surface waves by appropriate control (so-called SAW) or also piezoelectric vibrators can be used as vibrators. By coupling the high-frequency mechanical vibrations into the bath, the impedance of the oscillation requirement consisting of oscillator and flow liquid determined. The value of this impedance, consisting of real part and imaginary part, is stored in an electronic evaluation unit. The impedance value of the solution changes depending on the biological load on the bath, which is caused by contaminated or soiled instruments. If the impedance reaches a critical value, this is displayed in order to achieve a bath change.
Die mit zunehmender Badverschmutzung erfolgende Imped¬ anzänderung ist abhängig von der Art des verwendeten Desinfektionsmittels, von der Art der biologischen Be¬ lastung und von der Zeit. Entsprechende Kriterien kön¬ nen in der elektronischen Auswerteeinheit berücksich- tigt werden.The change in impedance which occurs with increasing pollution of the bath depends on the type of disinfectant used, on the type of biological load and on the time. Corresponding criteria can be taken into account in the electronic evaluation unit.
Vorzugsweise wird die Impedanz bei frischer Desinfek¬ tionslösung gemessen und in Abhängigkeit von diesem Anfangs-Impedanzwert wird der Grenztwert bestimmt, bei dem die Lösung unbrauchbar wird. Die Bestimmung dieses Grenzwertes kann dadurch erfolgen, daß eine vorgegebene Differenz zum Anfangs-Impedanzwert gebildet wird, oder daß der Anfangs-Impedanzwert mit einem Paktor multipli¬ ziert wird, der kleiner ist als 1.The impedance is preferably measured in the case of fresh disinfection solution and the limit value at which the solution becomes unusable is determined as a function of this initial impedance value. This limit value can be determined by forming a predetermined difference from the initial impedance value or by multiplying the initial impedance value by a factor that is less than 1.
Im folgenden wird unter Bezugnahme auf die einzige Fi¬ gur der Zeichnung ein Ausführungsbeispiel der Erfindung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the single FIGURE of the drawing.
In der Zeichnung ist eine Vorrichtung zur Erfassung der Nutzungsdauer eines Desinfektionsbades schematisch als Blockschaltbild dargestellt. Das Desinfektionsbad 10 weist eine Wanne 11 auf, in der sich die Desinfektionslösung 12 befindet, in die die Instrumente hineingelegt werden. In die Desinfektions- lösung taucht eine Sonde 13 ein, die mindestens einen elektromechanischen Schwinger 14 enthält. Der Schwinger 14 kann alternativ auch in dem Desinfektionsbad 10 fest installiert sein. Vorzugsweise ist die Sonde 13 so aus¬ gebildet, daß sie in das Bad hineingehalten werden und auch wieder herausgezogen werden kann.In the drawing, a device for recording the useful life of a disinfection bath is shown schematically as a block diagram. The disinfection bath 10 has a tub 11 in which the disinfection solution 12 is located, in which the instruments are placed. A probe 13, which contains at least one electromechanical oscillator 14, is immersed in the disinfection solution. Alternatively, the oscillator 14 can also be permanently installed in the disinfection bath 10. The probe 13 is preferably designed such that it can be held in the bath and can also be pulled out again.
Die Sonde 13 ist elektrisch mit einer AnsteuereinheitThe probe 13 is electrical with a control unit
15 verbunden. Die Ansteuereinheit erzeugt eine elektri¬ sche WechselSpannung hoher Frequenz, die dem Schwinger 14 zugeführt wird. Der Schwinger 14 steht in unmittel- barer Berührung mit der Desinfektionslösung 12. Er er¬ zeugt infolge der elektrischen Anregung mechanische Schwingungen, die durch die Badflüssigkeit beeinflußt werden.15 connected. The control unit generates an electrical alternating voltage of high frequency, which is fed to the oscillator 14. The oscillator 14 is in direct contact with the disinfectant solution 12. As a result of the electrical excitation, it generates mechanical vibrations which are influenced by the bath liquid.
Die Werte von Strom und Spannung der Erregung des Schwingers 14 werden von der Ansteuereinheit 15 an eine Meßeinrichtung 16 übertragen. Aus den Strom- und Span¬ nungswerten bildet die Meßeinrichtung 16 den Impedanz- wert, der aus einem Realteil und einem Imaginärteil besteht. Diesen Impedanzwert liefert die MeßeinrichtungThe values of current and voltage of the excitation of the vibrator 14 are transmitted from the control unit 15 to a measuring device 16. From the current and voltage values, the measuring device 16 forms the impedance value, which consists of a real part and an imaginary part. The measuring device supplies this impedance value
16 an eine Auswerteeinheit 17.16 to an evaluation unit 17.
Die Auswerteeinheit 17 ist ein Mikroprozessor, dem eine Information 18 über die Art des verwendeten Desinfek- tionsmittels zugeführt wird und eine Information 19 über die maximal zulässige Impedanzänderung. Ferner enthält die Auswerteeinheit 17 einen Zeitgeber, der die maximal zulässige Nutzungsdauer der Desinfektionslösung überwacht und Alarm gibt, wenn die Sonde 13 eine be- stimmte Zeit in die Desinfektionslösung eingetaucht ist. Auf diese Weise wird die maximale Nutzungsdauer der Desinfektionslösung zwangsweise begrenzt.The evaluation unit 17 is a microprocessor to which information 18 about the type of disinfectant used and information 19 about the maximum permissible change in impedance is supplied. The evaluation unit 17 also contains a timer which monitors the maximum permissible service life of the disinfectant solution and issues an alarm if the probe 13 detects a immersed in the disinfectant solution. In this way, the maximum useful life of the disinfectant solution is limited.
Nach dem Einbringen der frischen Desinfektionslösung 12 wird der Anfangs-Impedanzwert der Desinfektionslösung gemessen und in der Auswerteeinheit 17 gespeichert. Dadurch wird der Zustand des Desinfektionsbades, wel- eher die Eigenschaft zu Beginn der Anwendungszeit be- schreibt, festgelegt. Während der Benutzung verändert sich das Desinfektionsbad. Diese Veränderung wird durch sich laufend wiederholende Impedanzmessungen als Diffe¬ renz zum Anfangs-Impedanzwert festgestellt. Diese Dif¬ ferenz wird in der Anzeigeeinheit 20 angezeigt. Die Anzeige erfolgt beispielsweise dadurch, daß die Rest- Nutzbarkeit des Bades in Prozent oder in Zeiteinheiten angezeigt wird.After the fresh disinfectant solution 12 has been introduced, the initial impedance value of the disinfectant solution is measured and stored in the evaluation unit 17. This determines the condition of the disinfection bath, which rather describes the property at the beginning of the application period. The disinfection bath changes during use. This change is determined by continuously repeating impedance measurements as a difference to the initial impedance value. This difference is displayed in the display unit 20. The display takes place, for example, in that the remaining usability of the bath is displayed in percent or in time units.
Erreicht die Impedanz-Differenz einen bestimmten vor- gegebenen Grenzwert, so wird der Badwechsel einerseits in der Anzeigevorrichtung 20 sichtbar und zum anderen wird von einem Alarmgeber 21 akustischer oder optischer Alarm gegeben. Die maximal zulässige Impedanzdifferenz kann entsprechend der Art des verwendeten Desinfek- tions ittels variieren.If the impedance difference reaches a certain predetermined limit value, the bath change is visible on the one hand in the display device 20 and, on the other hand, an alarm transmitter 21 gives an acoustic or visual alarm. The maximum permissible impedance difference can vary depending on the type of disinfectant used.
Nach Ablauf einer bestimmten Maximalzeit der Badbenut¬ zung wird durch den in der Auswerteeinheit 17 enthalte¬ nen Zeitgeber Alarm erzeugt, unabhängig von dem ge es- senen Impedanzwert, weil nach Ablauf der Maximalzeit das Bad in jedem Fall gewechselt werden muß. After a certain maximum time of use of the bath has elapsed, the timer contained in the evaluation unit 17 generates an alarm, irrespective of the impedance value read, because after the maximum time has elapsed the bath must be changed in any case.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Verfahren zur Erfassung der Nutzungsdauer von Des¬ infektionsbädern, d a d u r c h g e k e n n z e i c h n e t , daß die Impedanz mindestens eines auf die Desin¬ fektionslösung (12) einwirkenden elektromechani¬ schen Schwingers (14) gemessen wird und daß die Nutzungsάauer beendet wird, wenn die Impedanz ei- nen vorgegebenen Grenzwert erreicht hat.1. A method for determining the service life of disinfection baths, characterized in that the impedance of at least one electromechanical transducer (14) acting on the disinfection solution (12) is measured and that the period of use is ended when the impedance is one has reached the predetermined limit.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Impedanz nach Realteil und Imaginärteil ermittelt wird und daß für die Auswertung beide Teile ausgewertet werden.2. The method according to claim 1, characterized in that the impedance is determined by real part and imaginary part and that both parts are evaluated for the evaluation.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß die Impedanz bei frischer Desinfek- tionslösting (12) gemessen und in- Abhängigkeit von diesem Anfangs-Impedanzwert der Grenzwert bestimmt wird.3. The method according to claim 1 or 2, characterized gekenn¬ characterized in that the impedance with fresh disinfection solution (12) is measured and the limit value is determined as a function of this initial impedance value.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß an einer Anzeigeeinheit (20) die Differenz zwischen der gemessenen Impedanz und dem Anfangs¬ impedanzwert in Prozent oder als Rest-Nu zungsdau¬ er angezeigt wird.4. The method according to claim 3, characterized in that on a display unit (20) the difference between the measured impedance and the initial impedance value is displayed in percent or as a residual nuance duration.
5. Verfahren nach einem der Ansprüche 1 bis 4, da- durch gekennzeichnet, daß die Zeit der Nutzungs¬ dauer gemessen und die Nutzung beendet wird, wenn eine vorgegebene Maximalzeit erreicht ist. 5. The method according to any one of claims 1 to 4, characterized in that the time of the period of use is measured and the use is ended when a predetermined maximum time has been reached.
6. Vorrichtung zur Durchführung des Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeich¬ net, daß eine in das Desinfektionsbad (10) einge¬ tauchte Sonde (13) vorgesehen ist, die einen auf die Desinfektionslösung (12) einwirkenden elektro- mechanischen Schwinger (14) enthält und daß eine Meßeinrichtung (16) zur Bestimmung der Impedanz des Schwingers (14) vorgesehen ist.6. Device for performing the method according to one of claims 1 to 5, characterized gekennzeich¬ net that a in the disinfection bath (10) immersed probe (13) is provided, which acts on the disinfection solution (12) acting electromechanical Contains oscillator (14) and that a measuring device (16) is provided for determining the impedance of the oscillator (14).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeich¬ net, daß eine Auswerteeinheit (17) die Impedanz des Schwingers (14) bei frischer Desinfektionslö¬ sung (12) mißt und in Abhängigkeit von diesem An¬ fangs-Impedanzwert den Grenzwert festlegt. 7. The device according to claim 6, characterized gekennzeich¬ net that an evaluation unit (17) measures the impedance of the vibrator (14) with fresh disinfection solution (12) and determines the limit value as a function of this initial impedance value.
PCT/EP1994/003637 1993-11-13 1994-11-05 Method and device for determining the useful life of disinfection baths WO1995014227A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4338822.1 1993-11-13
DE19934338822 DE4338822A1 (en) 1993-11-13 1993-11-13 Method and device for determining the service life of disinfection baths

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WO1995014227A1 true WO1995014227A1 (en) 1995-05-26

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DE19919836C2 (en) * 1999-04-30 2001-08-02 Daimler Chrysler Ag Method for recognizing a forward and / or a reverse drive of a motor vehicle

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JPS6342461A (en) * 1986-08-07 1988-02-23 Mazda Motor Corp Fuel component detector

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