JPH0682454A - Immunoassay device - Google Patents

Abstract

PURPOSE:To provide an immunoassay device capable of performing measurement at high accuracy with a relatively small amount of data and having a simple device constitution. CONSTITUTION:In an immunoassay device, an antigen-antibody bonded body 2 generated through an antigen-antibody reaction is illuminated with light from a mercury lamp 3 and identification of antigens in a sample and measurement of the number of antigens are carried out according to the luminous intensity of fluorescent particles included in the antigen-antibody bonded body 2, and light intensity data based on the luminous intensity and antibody kind data showing the kinds of antibodies are input to the input layer 81 of a neural network 80 and data on the number of antigens corresponding to the input data are output from an output layer 83 through information processing at the neural network 80. In the learning mode using back propagation method, changeover switches 91, 92, 93 are switched so as to provide a teaching signal to the neural network 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immunoassay device for identifying various antigens such as bacteria, pollen and antibiotics and measuring the number of antigens.

[0002]

2. Description of the Related Art In diagnosing diseases such as tumors, infectious diseases, and hormonal abnormalities, it is necessary to accurately measure the concentration of antigen components contained in blood in very small amounts.
An immunoassay device as shown in is used.

This device utilizes the specificity of the antigen-antibody reaction as a measurement principle. As shown in FIG. 3 (a), a sample (21) containing an antigen (23) to be measured and an antibody (24). The reagent (22) containing the conjugate of fluorescent fine particles (25) is reacted in the reaction vessel (1) in which the antibody (24) is implanted, and the antigen-antibody reaction causes the antigen-antibody reaction as shown in FIG. 3 (b). The conjugate (2) is obtained. In the antigen-antibody conjugate (2), the antibody on the reaction container (1)
Antigen (23) is captured by (24) and each antigen (23)
A conjugate of the antibody (24) and the fluorescent fine particles (25) in the reagent (22) is bound to. Therefore, the number of the antigens (23) can be determined by measuring the number of the fluorescent fine particles (25) bound to the antigens (23).

Therefore, the immunoassay device irradiates the antigen-antibody bound substance (2) with light to cause the fluorescent fine particles (25) in the antigen-antibody bound substance (2) to emit light, and to detect the luminescence intensity. Is used to determine the number of fluorescent fine particles (25), and thus the number of antigens (23).

As shown in FIG. 4, the reaction container containing the antigen-antibody conjugate (2) is obtained by reflecting the light having a wavelength of 365 nm emitted from the mercury lamp (3) by the dichroic mirror (4).
Irradiate the back surface of (1). As a result, the antigen-antibody conjugate
The fluorescent fine particles in (2) emit light having a wavelength of 450 nm, and this light passes through the dichroic mirror (4) and the radiation filter (5) and reaches the optical amplification tube (6).

As a result, from the light amplification tube (6), the luminescence intensity of the antigen-antibody bound substance (2), that is, the antigen-antibody bound substance
An output corresponding to the number of fluorescent fine particles (25) contained in (2) is obtained, and the number of antigens is estimated from the output value. The type of antigen can be identified based on the presence or absence of antibody-antigen reaction with a known antibody, that is, the presence or absence of output from the light amplification tube (6).

[0007] When estimating the number of antigens, the luminescence intensity of the antigen-antibody conjugate is examined in advance for a sample of known antibody type and number of antigens, and the relationship between them is stored in a database. The number of antigens corresponding to the emission intensity is extracted from the database.

[0008]

However, since the above-mentioned immunoassay device estimates the number of antigens based on the luminescence intensity of the antigen-antibody-bound product, it has the drawback of poor measurement accuracy. In order to increase the measurement accuracy, the amount of data in the database becomes enormous and it is not practical.

Further, in order to be able to measure a new type of antigen, it is necessary to input the relationship between the number of antigens and the luminescence intensity of the new type of antigen into the database again. Therefore, a large amount of data has to be input, which poses a problem of further increasing the capacity of the database.

On the other hand, the antigen-antibody conjugate (2) shown in FIG. 3 (b)
Are collected from the reaction vessel (1), introduced into a laser fluorescent fine particle counter, the fluorescence pulses generated when the antigen-antibody conjugate passes through the laser luminous flux are counted, and the number of antigens is measured in particle units. A device for measuring is proposed. However, in this device, not only the measurement work is complicated, but also the device configuration is complicated.

An object of the present invention is to provide an immunoassay device which can perform highly accurate measurement with a relatively small amount of data and has a simple device configuration.

[0012]

The immunoassay device according to the present invention applies light from a light source to an antigen-antibody conjugate (2) in which an antibody and fluorescent fine particles are bound to an antigen in a sample by an antigen-antibody reaction. Irradiation is performed to identify the antigen in the sample and measure the number of antigens based on the emission intensity of the fluorescent fine particles contained in the antigen-antibody conjugate (2). Light intensity data creating means for creating corresponding light intensity data, antibody type data input means for inputting the antibody type as numerical data in the measurement mode, and the light intensity data and antibody type data are input. Input layer
(81) and an information processing means equipped with a hierarchical neural network (80) having an output layer (83) for outputting the number-of-antigens data, and the type of antibody to be a teacher signal in the learning mode by the backpropagation method It comprises a teacher signal input means for inputting data, light intensity data and antigen number data to the neural network (80), and switching means for switching between the actual measurement mode and the learning mode.

[0013]

[Function] When constructing the neural network (80), the teacher signal for a known sample obtained by human measurement with a microscope, that is, the kind of antibody and the number of antigens, and the luminescence intensity of the antigen-antibody conjugate are accurately measured. Based on the relationship, preliminary learning based on the backpropagation method is performed in advance, and the input layer (8
1), the weight and threshold value of the snaps coupling between the intermediate layer (82) and the output layer (83) are determined.

When the antigen-antibody conjugate (2) to be measured is irradiated with light from a light source in a state where the measurement mode is set by the switching means, the antigen-antibody conjugate is
The fluorescent fine particles contained in (2) emit light, and light intensity data corresponding to the emitted light intensity are created, and the light intensity data is supplied to the input layer (81) of the neural network (80).

At the same time, the type of antibody in the antigen-antibody conjugate (2) is input as numerical data to the input layer (81) of the neural network (80).

As a result, the neural network (8
Intelligent information processing by 0) is performed, and the antigen layer data corresponding to the input data is output from the output layer (83).

At this time, even when data different from the antibody type data and the light intensity data which have become the teacher signals during the preliminary learning are input to the input layer (81), the neural network (80) has an interpolation ability. It is activated and outputs the appropriate antigen number data according to the input data.

The type of the antigen is identified based on the output value of the neural network (80). When the output value is other than 0, the antigen corresponding to the known antibody in the sample is regarded as the antigen in the sample. judge.

When adding new data such as a teacher signal for a new type of antigen, the learning mode is set by the switching means. In this state, the neural network (8
Antibody type data and light intensity data are input to the input layer (81) of 0), and antigen number data is input to the output layer (83) as a teacher signal, and additional learning is performed by the back propagation method. As a result, the neural network (80) will be reconstructed into a configuration with higher accuracy and capable of measuring a new type of antigen.

[0020]

According to the immunoassay device of the present invention,
The interpolation function and the learning function of the neural network enable highly accurate measurement with a smaller amount of data than the conventional immunoassay device using a database. or,
Even when measurement of a new kind of antigen is possible, the learning function of the neural network allows the neural network to be reconstructed into a highly accurate configuration by adding a small amount of data. Of course, the measurement work is only required to prepare an antigen-antibody conjugate and irradiate it with light, and the device configuration is simpler than that of the conventional laser fluorescence particle counting device.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the immunoassay device according to the present invention irradiates the antigen-antibody bound substance (2) on the reaction container (1) with light to measure the emission intensity of the antigen-antibody bound substance (2). Structure, ie, mercury lamp (3), dichroic mirror
(4), a radiation filter (5) and an optical amplification tube (6), and an output signal of the optical amplification tube (6) is an A / D converter
Supply to (7).

The A / D converter (7) is an optical amplification tube (6).
The analog output of is digitized to create light intensity data.

Further, the immunoassay device inputs the type of antibody as numerical data in the actual measurement mode, and in the learning mode by the backpropagation method, the antibody type data, the light intensity data, and the number of antigens data to be a teacher signal are neural-coded. Equipped with an input section (94) for inputting to the network (80),
The input data is supplied to the control unit (9).

Information processing unit, which is the brain of the immunoassay device
(8) is a hierarchical neural network (81) consisting of two units, an intermediate layer (82) consisting of many units, and an output layer (83) consisting of one unit. Equipped with 80).

The light intensity data sent from the A / D converter (7) in the actual measurement mode and the light intensity data sent as a teacher signal from the control section (9) in the learning mode are the first It is selectively input to one unit of the input layer (81) of the neural network (80) via the switching switch (91). The antibody type data sent from the control unit (9) in the actual measurement mode and the antibody type data as a teacher signal sent from the control unit (9) in the learning mode are stored in the second switching switch (92). Selectively via the neural network (8
It is input to the other unit of the input layer (81) of 0).

Further, the antigen number data obtained from the output layer (83) of the neural network (80) in the actual measurement mode is output through the third switching switch (93), and in the learning mode,
The antigen number data as a teacher signal obtained from the control unit (9) is input to the output layer (83) of the neural network (80) via the switching switch (93).

In the actual measurement mode, the switching switch (9
1) (92) (93) is switched to the side a, whereby the antibody type data from the control unit (9) and the light intensity data from the A / D converter (7) are input to the neural network (80). layer
Input to (81).

As a result, the neural network (8
Intelligent information processing by 0) is performed, and the antigen layer data corresponding to the input data is output from the output layer (83).

In the learning mode, the switching switch (9
1) (92) (93) is switched to the b side, whereby the teacher signal from the control unit (9), that is, the antibody type data and the light intensity data, is transferred to the first and second switching switches (91) (92). At the same time as being input to the input layer (81) of the neural network (80), the antigen number data is input to the output layer (83) of the neural network (80) via the third switching switch (93).

FIG. 2 shows an example of teacher data input to the neural network (80) in the learning mode by the backpropagation method.
The antibody type data and the light intensity data are stored in the output layer (8) in (81).
The antigen number data is entered in 3). The data shown in FIG. 2 are input to the neural network (80) after being normalized.

According to the above immunoassay device, the interpolation function and the learning function exerted by the neural network (80) enable highly accurate measurement with a smaller amount of data than the conventional immunoassay device using the database. That is, even if data not included in the teacher signal shown in FIG. 2 is input in the measurement mode, the neural network (80)
Outputs the number-of-antigens data according to the input data without performing any special processing, it is not necessary to newly import the input data into the database as in the conventional case.

Also, when enabling measurement of a new type of antigen, the learning function of the neural network (80) makes it possible to reconstruct the neural network into a highly accurate structure by adding a small amount of data. I can.
That is, in the conventional database-based device, accurate measurement is impossible unless a large amount of data on a new type of antigen is input in advance, whereas in the immunoassay device according to the present invention, The additional learning function originally possessed by the network makes it possible to enhance intelligence by adding a small amount of data without making any special structural changes.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an immunoassay device according to the present invention.

FIG. 2 is a chart showing an example of a teacher signal to be input in a learning mode.

FIG. 3 is a diagram explaining the principle of antigen identification and antigen number measurement based on an antigen-antibody reaction.

FIG. 4 is a schematic configuration diagram of a conventional immunoassay device.

[Explanation of symbols]

 (1) Reaction container (2) Antigen-antibody conjugate (23) Antigen (24) Antibody (25) Fluorescent fine particles (3) Mercury lamp (6) Light amplification tube (8) Information processing unit (80) Neural network (81) Input layer (82) Middle layer (83) Output layer

Front page continuation (72) Inventor Naohide Tanikawa 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Hiroshi Kawada 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. An antigen-antibody conjugate (2), which comprises irradiating light from a light source onto an antigen-antibody conjugate (2) in which an antibody and fluorescent fine particles are bound to an antigen in a sample by an antigen-antibody reaction In an immunoassay device for identifying an antigen in a sample and measuring the number of antigens based on the emission intensity of fluorescent fine particles, a light intensity data creating means for producing light intensity data according to the emission intensity in a measurement mode. In the measurement mode, the antibody type data input means for inputting the antibody type as numerical data, the input layer (81) into which the light intensity data and the antibody type data are input, and the antigen number data are output. Information processing means equipped with a hierarchical neural network (80) having an output layer (83) and antibody type data, light intensity data and Immunoassay apparatus characterized in that it comprises a teacher signal input means for inputting the number data to the neural network (80), and switching means for switching the actual mode learning mode.