System for the liquid sample analysis comprising a position control unit
Abstract
System for analyzing liquid samples by titration of test elements with an analytical unit (20), in which a test element (10) subjected to analysis is placed by means of a fixing device (21, 22, 120, 140) in a position of analysis corresponding to the analytical unit, and the system also contains a control unit to check if an analysis area of the test element is well positioned for measurement with the analytical unit, so that the position control unit comprises - a light source (30, 2), to radiate a surface of the test element, preferably its analysis area (11), - a detector (31, 131), to capture the light reflected by the surface, and - an evaluation unit, and the light source and the detector are located in such a way with respect to each other, that the intensity reflected specularly in the detector, when the test element is well placed for determination, it differs so much from the light intensity when the position is false, that the difference in intensities of the specularly reflected radiation makes it possible to recognize a bad placement; characterized in that the evaluation unit, being a test element well positioned in the longitudinal direction for measurement, allows detecting a vertical deviation of the position of a test element by the light intensity in the detector.

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Projected expiry passed 5 December 2021, 4.8 years ago.
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14 claims: 3 independent, 11 dependent
- 1ES 2 284 579 T3 REIVINDICACIONES 1. Sistema para analizar muestras líquidas por valoración de elementos de ensayo con una unidad analítica (20), en el cual un elemento de ensayo (10) sometido a análisis se coloca mediante un dispositivo fijador (21, 22, 120, 140) en una posición de análisis correspondiente a la unidad analítica, y el sistema contiene además una unidad de control para comprobar si una zona de análisis del elemento de ensayo está bien posicionada para su medición con la unidad analítica, de modo que la unidad de control de la posición comprende - una fuente lumínica (30, 2), para irradiar una superficie del elemento de ensayo, preferentemente su zona de análisis (11), - un detector (31, 131), para captar la luz reflejada por la superficie, y - una unidad de valoración, y la fuente lumínica y el detector están situados de tal modo uno respecto al otro, que la intensidad reflejada especularmente en el detector, cuando el elemento de ensayo está bien situado para la determinación, difiere tanto de la intensidad lumínica cuando la posición es falsa, que la diferencia de intensidades de la radiación reflejada especularmente permite reconocer una mala colocación;caracterizado porque la unidad de valoración, estando un elemento de ensayo bien situado en dirección longitudinal para la medición, permite detectar una desviación vertical de la posición de un elemento de ensayo por la intensidad lumínica en el detector.
- 2Sistema según la reivindicación 1, en el cual la fuente lumínica y el detector están dispuestos uno respecto al otro de tal manera, que, cuando el elemento de ensayo está bien posicionado para la medición, incide radiación relejada especularmente sobre el detector y la parte de radiación relejada especularmente disminuye cuando hay un mal posicionamiento.
- 3Sistema según la reivindicación 1, en el cual la fuente lumínica y el detector están dispuestos uno respecto al otro de tal manera, que, cuando el elemento de ensayo está bien posicionado para la medición, la parte de radiación relejada especularmente es baja o nula y cuando el elemento de ensayo está mal posicionado es mayor.
- 4Sistema según la reivindicación 1, en el cual se irradia la zona analítica con la unidad de análisis y se determina la concentración de un analito mediante la radiación reflejada o transmitida por la zona analítica.
- 5Sistema según la reivindicación 4, en el cual la unidad analítica que se emplea para detectar la radiación utiliza el detector de la unidad de control de posición.
- 6Sistema según la reivindicación 4, en el cual la unidad analítica que se emplea para irradiar la zona analítica utiliza la fuente lumínica de la unidad de control de posición.
- 7Sistema según la reivindicación 1, en el cual el dispositivo fijador está configurado de tal modo, que un elemento de ensayo capaz de doblarse a lo largo de su eje longitudinal es sujetado por dicho dispositivo en un extremo de dicho eje, con lo cual, al doblarse el elemento de ensayo a lo largo del eje longitudinal, se forma un mal posicionamiento, respecto a la unidad de análisis, de una zona analítica distanciada del extremo que se mantiene sujeto.
- 8Sistema según la reivindicación 1 o 5, en el cual la unidad analítica posee una fuente lumínica de medición y hay una unidad monitora que regula secuencialmente la fuente lumínica de medición y la fuente lumínica de la unidad de control de posición.
- 9Sistema según la reivindicación 8, en el cual la fuente lumínica de medición irradia la zona analítica bajo un ángulo α y la fuente lumínica de la unidad de control de posición irradia la zona analítica bajo un ángulo β respecto a la perpendicular a la superficie, de modo que α β.
- 10Sistema según la reivindicación 1, en el cual la unidad de control de posición lleva una segunda fuente lumínica que está posicionada de tal manera respecto al detector, que la intensidad de luz de esta radiación reflejada por el elemento de ensayo varía en el detector de modo inverso a la intensidad de luz de la fuente lumínica para el control de posición, cuando el elemento de ensayo se aleja de la posición correcta para la determinación.
- 11Sistema según las reivindicaciones 2 y 10, en el cual la proporción de radiación reflejada especularmente de la fuente lumínica para el control de posición aumenta en el detector al producirse un mal posicionamiento.
- 12Proceso para analizar muestras líquidas por valoración de elementos de ensayo con una unidad analítica, en el cual se examina mediante una unidad de control de posición si una zona analítica (11) del elemento de ensayo está correctamente posicionada para la medición respecto a la unidad analítica, con cuyo fin una superficie del elemento de ensayo, preferentemente la zona analítica, se irradia con una fuente lumínica (30, 2), la radiación reflejada por la superficie es captada por un detector (31, 131) y una señal emitida por el detector es registrada por una unidad de valoración, para controlar el posicionamiento de la zona analítica, estando la fuente lumínica y el detector colocados de tal modo uno respecto a otro, que la intensidad de la radiación reflejada especularmente en el detector por el elemento de ensayo, cuando la posición de la zona analítica es correcta para la determinación, difiere de la intensidad en caso de posición errónea;caracterizado porque, basándose en las diferentes intensidades de luz de la radiación reflejada especularmente, puede detectarse una desviación de la posición vertical del elemento de ensayo cuando dicho elemento se ha posicionado de manera correcta en dirección longitudinal.
- 13Proceso según la reivindicación 12, en el cual la unidad analítica posee una fuente lumínica separada (1a, 1b), pero, para la detección, utiliza el detector (131) de la unidad de control de posición, y la fuente lumínica (2) de la unidad de control de posición es accionada en un momento T K y la fuente lumínica de medición en un momento T A , de modo que, basándose en la señal emitida por el detector en el momento TK, se realiza un control de posición de la zona analítica y, basándose en la señal emitida en el momento TA, tiene lugar una valoración para determinar la concentración de un analito.
- 14Proceso según la reivindicación 13, en el que los momentos T K y T A n están separados por menos de un segundo.
Independent claims14
21 paragraphs in 2 sections, as filed
ES 2 284 579 T3
DESCRIPTION
System for analyzing liquid samples that includes a position control unit.
The present invention belongs to the field of liquid sample analysis using analyte-specific, disposable test elements. The present invention can be used in those analysis systems where the placement of the test element relative to a titration unit is critical, as in the specific case of an optical titration of test elements.
In the technical state, analysis systems that work with disposable test elements have been established, especially to determine the level of sugar in the blood. These devices are used by diabetics to monitor blood sugar level and, based on this measurement, regulate it through diet or with a dose of insulin. In this field there are devices called measurement sensors, in which the glucose contained in the blood is determined electrochemically, and optical systems, where an analyte-dependent color variation on the test element serves to determine its concentration. These optical systems, based on analyte-dependent color variation, are also known in the titration of test strips for urea or test items for other parameters, such as lactate, creatinine, proteins, uric acid, leukocytes, etc. Especially in optical systems, the relative position of the analysis area with respect to the optical meter is of decisive importance for the precision and correctness of the measurement carried out. Therefore, in the field of analysis systems for evaluating test elements, some attempts have been made to ensure that the positioning of the analytical zone of a test element is adequate for the determination. As in small-format analysis systems, it is the user who must introduce the test elements into the apparatus, in addition to reliable positioning, it is also necessary to offer simple handling, so that the system is attractive to the user. In patent EP B 0 618 443 a fixing device is described which fulfills these conditions and yet has a very simple shape. The test strip, at the front end (distal end) of which there is a recess, is inserted into this clamping device, until a pin engages the recess and the strip is positioned in the longitudinal direction. For positioning in the transverse direction, the device has guides. As the test element is lifted in the area of the pin and is pressed by a clamping piece, it takes on a slightly curved shape that presses the analytical zone of the test element on the substrate, thanks to the flexibility of the strip. Below the analytical zone is a window or notch, which allows an optical assessment through them. Even in a well-developed fixation device, such as that described in patent EP 0 618 443, it cannot be excluded that the user lifts the test element from the side opposite the device (proximal end), in such a way as to vary the position of the analytical zone with respect to the analytical apparatus and the result is falsified. This problem occurs more frequently in less sophisticated test strip fixation devices. Also, US 5,246,858 describes a positioning detector in a blood sugar measuring apparatus, which measures a mark on a test strip. In this way the system can recognize whether the test strip has been inserted correctly with the front part, for the purpose of the determination. The consequence of incorrect positioning are false measured values. In the specific case of blood sugar control carried out by diabetics themselves, these false measurements can have fatal consequences. If, for example, the patient is told that the blood sugar is too high, they may react, under certain circumstances, by injecting an excessive dose of insulin, which in an extreme case would cause fatal hypoglycemia. Therefore there is an urgent need to be able to avoid said false positioning or at least recognize them, so that the user notices the failure.
In the present invention this problem is solved with a system for analyzing liquid samples by titration of test elements in an analytical unit, in which a test element under analysis is placed, by means of a fixing device, in a corresponding analysis position to the analytical unit. The system features a control unit that allows checking if an analysis area of the test element is well positioned for measurement with the analytical unit. The position control unit has a light source to irradiate an area of the test element, preferably its analysis zone, and also a detector to capture the light reflected by the area. The light source and the detector are positioned relative to each other so that the intensity reflected from the detector when the test element is well positioned for measurement differs so much from the light intensity when the position is false that the different intensities of the reflected radiation make it possible to recognize a misplacement and, by means of an evaluation unit, a test element being well positioned in the longitudinal direction for the measurement, A vertical deviation of the position of a test element can be recognized by the light intensity in the detector. According to a first embodiment of said system, the light source and the detector are positioned relative to each other in such a way that the radiation from the light source reflected by the test element falls on the detector when the test element is correctly positioned. On the other hand, if the test element is moved away from the correct position for the determination, due to, for example, lifting the end of the test element opposite the clamping device, the light cone of the reflected radiation moves in such a way that it no longer falls directly on the detector and the light intensity decreases at the detector. In a second embodiment, the reverse process is chosen, that is, when the positioning is correct, the reflected radiation does not fall on the detector. On the other hand, when a bad positioning occurs, the light cone of the reflected radiation falls on the detector, also allowing a false positioning to be recognized.
Thus, an analysis system with a positioning control unit according to the present invention offers the user the advantage of being able to avoid false analysis results thanks to the detection of mispositioning. The user can also be alerted to a mispositioning so that it can be corrected and then safely run the analysis with the same test item. Therefore,
ES 2 284 579 T3 in these forms of execution it is avoided that the user has to use a new test element, which entails costs and is unfavorable in terms of handling, since it forces the user to take another liquid sample (in general, to prick your fingertip).
The present invention can be advantageously applied in analysis systems where a bad positioning of a test element falsifies the results of the analysis. First of all, they are optical measurement systems in which the analysis takes place by irradiating an analytical zone of the test element and evaluating the reflected or transmitted radiation. Relatively smaller patient-operated analysis systems are also a preferred field of application. Such a system is described for example in EP B 0 618 443. These devices are commercially available, for example under the trademarks Accutrend®, AccuCheck®, Glucotrend® and Glucometer.<sup>®</sup>. The present invention is of special importance in those systems where test elements are used that can bow along their longitudinal axis and that are only held by one of their ends in the analysis apparatus. The importance of this last criterion is especially evident when comparing the present invention with EP B 0 779 983. In the apparatus according to patent EP B 0 779 983 a test strip fastener is used which holds the strip both at its distal end and in a part close to the analysis zone. This prevents the test strip from bending along its longitudinal axis in the analysis zone and therefore any mispositioning for this reason. However, the price paid for it is very high in terms of user comfort. On the one hand, the insertion of the test element into the fixator is relatively cumbersome and, on the other hand, the analytical zone moistened with the liquid sample (generally blood) must be pushed through a constriction. The latter results in contamination of the fixative device of the test strip, whereby the fixative used in the system must also be designed so that it is removable and cleanable. On the contrary, in the framework of the present invention, fixing devices are preferably used that hold the test element only at its distal end, while the rest is accessible from the upper face. This is convenient for the user, because it facilitates insertion of the test element into the fixation device and, if desired, you can also deposit a liquid sample while the test element is correctly positioned for a determination in the analysis apparatus. The accessibility of the test element according to this form also gives the apparatus a very open appearance and therefore pleasant for the user.
As already mentioned, the present invention is applicable, above all, to the field of analysis systems that operate optically, which are already well known and do not need to be described in detail at this point. However, it should be noted that the present invention is especially good for those apparatus in which the analysis takes place by irradiating an analytical zone and assessing the reflected diffuse radiation. In EP 0 819 943, for example, specifically in Figures 3 to 5 and in the accompanying text, a suitable optics for the apparatus is shown and described.
In principle, the test elements to be used in the system of the present invention do not require special properties, in comparison with those known from the technical state for said apparatus. However, the present invention is effective for test items that can be bent along their longitudinal axis and are commonly called test strips. These strips have prevailed, above all, because they are simple and inexpensive to manufacture, and also because they are easy for the user to handle. In general, they have a flexible plastic support in the form of a strip. Typical measurements are, for example, 4 cm x 7 mm and 1 mm thick. The strip has an analytical zone inside or on the surface that comes into contact with the liquid sample, causing a change that depends on the concentration of the analyte and is optically detectable. The structure of such a test element is described for example in US 6,036,919. Since the construction of the test strip and its chemistry are well known from the technical state, they are not discussed in more detail here. However, within the framework of the present invention, it is important that the test element, and preferably also the analytical zone, reflect the incident radiation, at least in part. As already mentioned, the detection of the reflected radiation serves to control the position of the analytical zone. It is preferred that the position control is directly mounted in the same analytical zone, but if this is impossible, for example because the reflected radiation of the specular type is too low relative to the reflected radiation of the diffuse type, a part can also be used. of the test element close to the analytical zone for position control. In general, the control will be feasible without the need for special devices, since common plastic support materials have sufficient specular reflectivity. But, if necessary, the area of the test element where the positioning control takes place can also be prepared to mirror the radiation, for example by depositing a reflective material by vaporization or sputtering, in order to facilitate such control. As an alternative, a suitable material can also be chosen for the support of the test element. As already mentioned, as a general rule it is not necessary to carry out the positioning control outside the analytical zone, since this usually has a sufficiently high specular reflection. Even materials that seem fuzzy to the observer, such as eg. ex. To see them impregnated, they have by nature a specular reflection part, which is often undesirable for the evaluation of the analytical zone with a diffusely reflected radiation. Figure 1 represents the structure of a test element (10) that is commercially available under the brand name Gluccotrend<sup>®</sup>. It can be seen that the reagent matrix (14) is arranged on a transparent sheet (13). In this test strip, the sample (40) is deposited at the top and the analytical titration takes place by irradiating the reagent matrix from below and detecting the reflected diffuse radiation. The area of optical access through the opening (15) made in the support thus constitutes the analytical area of the test element. As the sheet (13) has specular reflection characteristics, with this test strip it is easy to control the positioning by means of the specularly reflected radiation, even when the reagent matrix itself has reflective properties.
ES 2 284 579 T3 diffuse types. In figure 1 a recess (16) can also be seen at the distal end, through which the strip is fixed in the manner already described. A more detailed description of the test element, to which reference is made, is found in US patent 6,036,919.
The operation of the present invention is schematically represented in figure 2. The test strip (10) is inserted at its distal end into the analytical unit (20), so that the test element is fixed by a pin (21) in a notch at the distal end and pressed by an edge (22) close to the notch. Figure 2A presents the correct positioning of the test element for determination and titration by an analytical unit. The apparatus (20) has an opening under the analytical zone (11) of the test element, which allows it to be irradiated from the lower side. The analysis unit is located below the opening, made up of a light source (30) and a detector (31). As light sources, those known from the technical state are suitable for this purpose. In particular, light emitting diodes can be used. As detector (31) one of the semiconductor type, such as a light emitting diode, or a photovoltaic element can be used. As seen in Figure 2A, the light source (30) is positioned so as to illuminate the analytical zone (11) at an acute angle relative to perpendicular to its surface. The detector (31) is positioned so that the reflected radiation falls on it. If, as shown in Figure 2B, the strip deviates from the correct position for the determination - which can occur, e.g. e.g. when the user lifts the end of the test element or when placing the proximal end of the test strip on an object - the specular radiation reflected by the analytical zone no longer hits the detector and the signal adjacent to it is lower to that received in case of correct positioning as in figure 2A. The displacement of the test element out of the correct position for the determination can be controlled almost continuously by the signal adjacent to the detector (31) and a bad positioning can be recognized by a decrease of the signal in a series of measurements. Since an almost continuous recording of measurements is accompanied by a rather high power consumption, it is preferred to control the positioning of the test element or the analytical zone only at the time when an analytical evaluation of the test element takes place. In this process, mispositioning can be detected by comparing the sensor signal with a threshold value, with a blank value without a test element, or with another measurement of the inserted test element. Other preferred titration methodologies are described in relation to a system that also features an optical element for analytical evaluation of the test element, which have been omitted in Figure 2 for clarity.
Figure 3A shows a top view of the stage of the apparatus, with the fixing device of the test element (120) incorporated, an optical zone with a detector of the semiconductor type (131) and an illumination optics (Y) that includes three diodes light emitters glued directly on the stage and lenses above the diodes. The illumination optics is explained in more detail by means of figure 4. Figure 3B shows the stage of figure 3A, with an additional removable plastic piece (140), which has a slot (141) to accommodate and laterally guide the test elements. The lateral fixation of the test element is ensured by combining said guide with the fixing device (120) that fits into a recess of the test element, as shown schematically in figure 2. The main object of the present invention is the detection of vertical position deviations. When a test element is lodged in the slot, as shown in Figure 3B, it can happen, through carelessness or systematic malfunction, that the end of the test element protruding from the apparatus is lifted and the analytical zone of the element is moved away. from the valuation optics. The optics of the apparatus, in combination with a suitable titration unit, serve to recognize such deviation and to analytically evaluate a test item.
Figure 4 shows the section (Y) of figure 3A with the light emitting diodes and the superimposed lenses (1a ', 1b', 2 '). In figure 4, the strong miniaturization of the analysis system can also be appreciated by the dimensions. In figure 4 three light sources can be seen, among which there are two light emitting diodes (1a and 1b) located at the same distance from the detector (131). These light emitting diodes serve both for analytically evaluating the test element and for recognizing whether a sufficient quantity of sample has been uniformly deposited on the analysis zone. This function, designated as underdosing detection, is described in European patent application EP A 0 819 943. The light emitting diodes and the detector are geometrically arranged so that only diffuse radiation reflected from the lower side of the analytical zone reaches the detector. On the other hand, the light emitting diode 2, used to control the positioning, is positioned so that in case of correct positioning of the analytical zone, that is to say when the test strip rests on the surface of the groove (141), it does not impinge on the detector no specularly reflected radiation. If, on the other hand, the test element is raised by its unattached end (proximal end), the detector receives a greater amount of specularly reflected radiation and the signal increases. The geometric position of the units is indicated in more detail in Figure 5, as a section through line 2-2 of Figure 3A. In figure 5 the light source 2 can only be seen as a small black dot located under the lens 2 '. The detector (131) is best appreciated by its surface extension. The area between the detector and the light source is made of black plastic, to serve as a light trap. Above the detector (131) there is also an optical window (131 ') that limits the solid angle of the incident light.
Figure 6 shows the relative remission received by the detector (131) when the different light emitting diodes are activated, as a function of the distance between the support surface of the test element (that is, the base of the slot (141)) and the analytical zone. The abscissa represents this distance in mm. The ordinate indicates the quotient of the intensity in the detector for a certain distance and a correct positioning. The upper curve, marked with diamonds, indicates the quotient of the signals at the photo-emitting diode 2 for position recognition. As can be seen, the ratio - and therefore the intensity - of the signal increases as the analytical zone moves away from the correct position for the determination. As seen in figure 5, this is the result
ES 2 284 579 T3 of the increase in the part of specularly reflected radiation incident on the detector. The lower curve, marked with triangles, reproduces the ratios of the signal values described above when activating the photo-emitting diode 1a. As can be seen, the ratio, and therefore the intensity, decreases as the analytical zone is moved away from the optical unit. This effect is due to the reduction of the solid angle by which the detector receives radiation. In order to detect a bad positioning or an elevation of the test element, it has been particularly useful to establish the difference between the intensity received with the light emitting diode 2 and the intensity received with the light emitting diode 1. This difference, in which the currents can also be advantageously included relative, it is more sensitive to a change in position than just the signal from light emitting diode 2.
To carry out a position control, the light emitting diodes 1a, 1b and 2 are activated sequentially. This can be done by means of a control unit regulated by a microprocessor, which can also serve as an evaluation unit for the intensity values obtained with the detector. . To control the position, the light source 2 is activated and the adjacent intensity signal is stored during this time interval. Compared to continuous operation, the one in which a frequency is superimposed on the regulating signal of the light emitting diode is better, and the signal received in the detector is evaluated by means of a synchronous amplifier, which makes it possible to eliminate the influence of the surrounding light. Position control is especially important at two points in the analysis, one of which is the blank value measurement. In this case, the position control ensures that the blank value is not distorted because the analytical zone is far from the measurement optics. In such a case, the apparatus would take a false blank value for the analytical evaluation and / or would cause a false delay in the subsequent course of the measurement.
After measurement of the blank value, the test area is monitored for a change in the signal over time (eg one measurement every second).
The variation of this signal is normally due to the deposition of a sample (or the withdrawal of the strip to put a sample outside the apparatus). Then it is switched to kinetic tracking.
Kinetic monitoring is based on the fact that the observed signals vary with time, since, once the liquid sample is deposited, a chemical reaction with kinetics usually occurs in the analytical zone. This temporal variation is detected by continuous or interval measurement (usually between 2 s and 0.5 s). Position recognition or control is also important in the case of blank value measurement, in order to prevent a change in position of the test item from initiating a kinetic tracking, even though no sample has been deposited, which would give results. completely false.
The second critical point is the analytical assessment itself, which is preferably activated when, when lighting with LED 1a or 1b, the temporal variation of the signal captured by the detector exceeds a predetermined threshold value. In this case the true analytical measurement is started. For this, it is measured successively with the light sources 1a and 1b, and an average value of the detector signals is preferably adopted to assess. In a short time interval, ie preferably less than 1 second, a position control is also performed to ensure that the detector signals have been recorded during correct positioning of the test element. Furthermore, measured values that are separated in time can lead to a false analysis result, because the chemical reaction continues in the analytical zone.
If an incorrect position is detected when measuring the blank value or during analytical evaluation, the device gives an error message. The device positively warns of the failure by means of an indication on a display or an acoustic signal, so that the user can correct it. Therefore, in most cases, proper control of the measurement cycle ensures that neither the measurement nor the test item with the sample should be rejected.
Contents2
5 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5
12 members in 6 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 10061336 | Germany | A | |
| 10061336 | Germany | A | |
| 2000161336 | Germany | – | |
| 1006133601128869 | – | – | – |
| DE2000161336 | – | – | – |
Members12
| Document | Office | Kind | |
|---|---|---|---|
| EP1213579A2 | European Patent Office (EPO) | A2 | |
| DE10061336A1 | Germany | A1 | |
| JP2002228659A | Japan | A | |
| US2002167668A1 | United States of America | A1 | |
| JP3495728B2 | Japan | B2 | |
| EP1213579A3 | European Patent Office (EPO) | A3 | |
| US6906802B2 | United States of America | B2 | |
| EP1213579B1 | European Patent Office (EPO) | B1 | |
| AT362103T | Austria | T | |
| ATE362103T1 | Austria | T1 | |
| DE50112478D1 | Germany | D1 | |
| ES2284579T3This record | Spain | T3 |
Numbers
- Publication
- 2284579
- Publication, DOCDB
- 2284579
- Publication, EPODOC
- ES2284579T
- Application
- 1128869
- Application, DOCDB
- 01128869
- Application, EPODOC
- ES20010128869T
Titles2
- Spanish
- SISTEMA PARA ANALIZAR MUESTRAS LIQUIDAS QUE INCLUYE UNA UNIDAD DE CONTROL DE POSICION.
- English
- SYSTEM FOR ANALYZING LIQUID SAMPLES THAT INCLUDES A POSITION CONTROL UNIT.
Classification
- CPC, 2
- G01N21/8483
- G01N21/4738
- IPC, 8
- G01N21 86
- G01N33 52
- G01B11 16
- G01N21 01
- G01N21 27
- G01N21 47
- G01N21 78
- G01N33 66