Patent Description:
As an example of an automatic analyzer having a constant-temperature apparatus that prevents the propagation of fungi generated in a constant-temperature medium without adversely affecting metal used for a circulation path of the constant-temperature medium and can improve the contamination, clogging, and optical characteristics of the circulation path, Japanese Literature <NUM> describes that a test tube for storing a sample is provided in a constant-temperature tank, a constant-temperature apparatus keeps the temperature of the sample constant by circulating the constant-temperature medium via a heating unit, and an ultraviolet lamp is constituted by a member that causes ultraviolet light to be transmitted through a part of the circulation path in the heading unit, and irradiates the constant-temperature medium with ultraviolet light through the member.

Patent Literature <NUM>: <CIT> <CIT> discloses an automatic analyzer with the features in the preamble of present claim <NUM>. Another conventional analyzer is described in <CIT> and a sampling system is shown in <CIT>.

An automatic analyzer that analyzes a specific component in a biological sample such as blood or urine is an apparatus that uses a reagent, which reacts with the specific component to change optical characteristics, or a reagent, which has an index that specifically reacts with the specific component, to measure a change in optical characteristics of a reaction solution of the specimen and the reagent, or counts the number of indices to perform qualitative and quantitative analysis.

This automatic analyzer generally includes a specimen supply unit in which reaction containers are arrayed on a circular rotary table and that includes a specimen container, a specimen transport mechanism, and a specimen dispensing mechanism in the vicinity of the rotary table, a reagent supply unit including a reagent cold storage unit, a reagent dispensing mechanism, and a reagent container automatic transport mechanism, a stirring mechanism that makes reaction between a specimen and a reagent uniform, a cleaning mechanism that cleans the reaction container after the reaction, an optical system mechanism that includes a light source unit and a light receiver that perform spectroscopic measurement, a control system that controls operations of each device within the apparatus, and the like, and operations are managed by software.

In recent circumstances surrounding automatic analyzers, the pursuit of higher speed, miniaturization, price reduction, and functions as an automatic machine is reaching a plateau. Therefore, functions and mechanisms for automatically loading specimens and exchanging reagent containers are beginning to be incorporated. In addition, emphasis is placed on further reducing operator work and reducing maintenance.

In the automatic analyzer, it is desired to keep a reaction container for causing a sample and a reagent to react with each other at <NUM>, which is the same as the body temperature of the human body, so that the reaction is stabilized. Therefore, the reaction container is immersed in a constant-temperature tank filled with constant-temperature water. The constant-temperature water flows in a circulation flow path so as to be maintained at a constant temperature and passes through a cooling portion and a heating portion so that the temperature is controlled.

The temperature around <NUM> is also a very suitable temperature for the propagation of germs. Excessive propagation of germs causes slime on the side of a part. When the slime accumulates, it turns into an aggregate (biofilm). This aggregate may separate from the surface of the part. When the separated aggregate passes through an optical axis, the aggregate may adversely affect analytical data.

Therefore, it is necessary to remove the slime before this aggregate is formed and always keep the inside of the circulation flow path clean. For this, physical cleaning is the most effective way. It is a major issue not to perform this cleaning or to reduce its frequency in aiming for reducing maintenance.

In addition, in order to prevent slime, in addition to cleaning the constant-temperature tank, regular replacement of constant-temperature water and addition of a chemical to prevent the propagation of germs are carried out. However, with only these methods, there is a limit to the suppression of germs in the circulation flow path for a long period of time.

On the other hand, as described in Patent Literature <NUM>, a method of preventing the propagation of fungi generated in a constant-temperature medium, and improving the contamination, clogging, and optical characteristics of the circulation path has been considered.

However, in the technique described in Patent Literature <NUM>, although bacteria flowing in the circulation flow path can be sterilized by ultraviolet light, there is a problem that bacteria that became a biofilm in the reaction tank and remained in the reaction tank could not be sterilized.

In addition, it has become clear that there is a problem that when a power supply of the apparatus is off, ultraviolet light is not emitted, and fungi propagate in the circulation flow path for the constant-temperature medium and in the reaction tank during a state in which the power supply is off. Therefore, even in the automatic analyzer described in Patent Literature <NUM>, replacing the constant-temperature medium and cleaning the inside of the reaction tank need to be performed regularly, which is time-consuming and burdensome for the operator.

The present invention provides an automatic analyzer that suppresses the propagation of fungi in a circulation flow path for a liquid such as a constant-temperature medium to reduce the frequency of exchanging liquids and the frequency of work of cleaning the inside of a reaction tank and reduce a time period for maintenance work performed by an operator, compared with conventional techniques.

The scope of the present invention is defined in claim <NUM>.

The dependent claims relate to preferred embodiments.

According to the present invention, it is possible to suppress the propagation of fungi in a circulation flow path for a liquid to reduce the frequency of exchanging liquids and the frequency of work of cleaning the inside of a reaction tank, compared with conventional techniques. Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Embodiments of an automatic analyzer according to the present invention are described below with reference to the drawings.

A first embodiment of the automatic analyzer according to the present invention is described with reference to <FIG> and <FIG>.

First, an entire configuration of an automatic analyzer is described with reference to <FIG> is a diagram schematically illustrating the entire configuration of the automatic analyzer according to the first embodiment.

The automatic analyzer <NUM> illustrated in <FIG> is an apparatus that is configured to analyze a specimen and mainly includes a main switch <NUM>, an analyzer <NUM> that analyzes the specimen, and an analysis controller <NUM> that controls an operation of the automatic analyzer <NUM>.

The main switch <NUM> supplies power from a commercial power supply <NUM> to a control power supply circuit <NUM> within the analysis controller <NUM> and a mechanism power supply circuit <NUM> within the analyzer <NUM>. In addition, the main switch <NUM> has a function as a breaker that blocks supply of power to the entire automatic analyzer <NUM> when electric leakage, overcurrent, or the like occurs on the commercial power supply <NUM> side.

The analyzer <NUM> mainly includes a dispensing mechanism <NUM>, reaction containers <NUM>, a reagent cooler <NUM>, a stirring mechanism <NUM>, a light source <NUM>, a photometer <NUM>, a reaction tank <NUM>, a flow path <NUM>, a temperature sensor <NUM>, a temperature adjusting mechanism <NUM>, a circulation pump <NUM>, a liquid supply unit <NUM>, the mechanism power supply circuit <NUM>, an actuator driving circuit <NUM>, and the like.

The dispensing mechanism <NUM> is a device that dispenses a specimen from a specimen container (not illustrated) into the reaction containers <NUM> and dispenses a reagent from a reagent container (not illustrated) into the reaction containers <NUM>. The reaction containers <NUM> are containers that hold a reaction solution obtained by causing the sample dispensed by the dispensing mechanism <NUM> to react with the reagent dispensed by the dispensing mechanism <NUM>. The plurality of reaction containers <NUM> are provided in the apparatus. The stirring mechanism <NUM> is a device that stirs the reaction solution held in the reaction containers <NUM>.

The reagent cooler <NUM> is a device that cools and stores the reagent container storing the reagent to be used for analysis and includes a cold storage power supply circuit. Power is supplied from the commercial power supply <NUM> to the reagent cooler <NUM> via the main switch <NUM>. Therefore, even in a stopped state, the degradation of the reagent is suppressed by storing the reagent at a low temperature.

The light source <NUM> is a device that emits light to the reaction solution held in the reaction containers <NUM> for qualitative and quantitative analysis. The photometer <NUM> is a mechanism that measures optical characteristics of the reaction solution. For example, the photometer <NUM> is a device that detects the amount of light emitted from the light source <NUM> and transmitted through the reaction solution. The result of the detection by the photometer <NUM> is output to an A/D converter <NUM> of the analysis controller <NUM>.

The reaction tank <NUM> is a mechanism that keeps the temperatures of the plurality of reaction containers <NUM> constant. The inside of the reaction tank <NUM> is filled with a constant-temperature medium supplied from a circulation flow path.

The flow path <NUM> is provided to manage the temperature of the constant-temperature medium within the reaction tank <NUM> and includes the temperature sensor <NUM>, the temperature adjusting mechanism <NUM>, and the circulation pump <NUM>. The liquid supply unit <NUM> is connected to the flow path <NUM>.

The temperature sensor <NUM> is a thermometer that is present in the reaction tank <NUM> and detects the temperature of the constant-temperature medium flowing in the flow path <NUM>.

The temperature adjusting mechanism <NUM> is a device constituted by a heater and a cooler that adjust the temperature of the constant-temperature medium within the flow path <NUM>.

The circulation pump <NUM> is a pump that circulates the constant-temperature medium within the reaction tank <NUM> and the flow path <NUM>.

The reaction tank <NUM>, the flow path <NUM>, the temperature sensor <NUM>, the temperature adjusting mechanism <NUM>, and the circulation pump <NUM> constitute an analyzer circulation system that circulates the liquid present in the analyzer <NUM>.

It is possible to change the order of the temperature sensor <NUM>, the temperature adjusting mechanism <NUM>, and the circulation pump <NUM> as appropriate.

In addition, although the case where the temperature sensor <NUM> is provided in the flow path <NUM> within the circulation path in <FIG> is described, the temperature sensor <NUM> can be provided at a position other than the position illustrated in <FIG>. It is sufficient if the temperature sensor <NUM> is located at a position where the temperature sensor <NUM> can measure the temperature of the constant-temperature medium. For example, the temperature sensor <NUM> may be located in the reaction tank <NUM>. The temperature sensor <NUM> can be located outside the circulation path.

The liquid supply unit <NUM> is a mechanism that stores the liquid to be used by the analyzer <NUM> and supplies the constant-temperature medium from upstream to each device within the analyzer <NUM>, for example, to the dispensing mechanism <NUM> and is constituted by a liquid tank or the like. The temperature of the liquid in the liquid supply unit <NUM> is basically not managed.

To suppress the retention of the liquid in the liquid supply unit <NUM>, a configuration for circulating the liquid in the liquid supply unit <NUM> is desirable. This configuration constitutes a supply unit circulation system. In addition, the liquid supply unit <NUM> may have a function of temporarily storing the constant-temperature medium.

The mechanism power supply circuit <NUM> is a device that supplies power from the commercial power supply <NUM> via the main switch <NUM> to each of mechanisms of the analyzer <NUM>.

The actuator driving circuit <NUM> is provided for each of the mechanisms constituting the analyzer <NUM> and drives each of the mechanisms based on a command from a CPU <NUM> via an input/output port <NUM>.

The analysis controller <NUM> transmits a control signal to the mechanism power supply circuit <NUM> and the actuator driving circuit <NUM> included in the analyzer <NUM> and connected via the input/output port <NUM>. In addition, the analysis controller <NUM> receives, via the A/D converter <NUM>, a signal detected by the photometer <NUM> at the time of the measurement of the reaction solution and performs necessary calculation to perform an analysis operation.

The analysis controller <NUM> includes an operation unit <NUM>, an interface <NUM>, the CPU (central processing unit) <NUM>, a display unit <NUM>, the control power supply circuit <NUM>, a memory <NUM>, a storage medium <NUM>, the input/output port <NUM>, the A/D converter <NUM>, and the like.

The operation unit <NUM> is a mechanism that inputs a command signal to the CPU <NUM> via the interface <NUM> and is constituted by a keyboard or a mouse that is configured to input various types of data such as various parameters, settings, analysis request information, and a command to start analysis.

The CPU <NUM> is a mechanism that performs various types of arithmetic processing and controls operations of each device in the automatic analyzer <NUM> based on a computer program stored in the storage medium <NUM> described later.

The CPU <NUM> according to the present embodiment performs control to switch at least one of the flow rate of the liquid circulated by the analyzer circulation system and the flow rate of the liquid circulated by the supply unit circulation system between a first flow rate at normal time and a second flow rate different from the first flow rate. Details thereof are described later.

The "normal time" when the liquid is circulated at the first flow rate in the present embodiment means, for example, the time of the execution of the analysis operation.

The display unit <NUM> is a device that displays various types of information based on a display command from the CPU <NUM> and is constituted by a liquid crystal display or the like that displays information such as an input screen for various parameters and settings, analysis inspection data of initial inspection or reinspection, and measurement results. The display unit <NUM> can be a touch panel display device that also serves as the above-described operation unit <NUM>.

The control power supply circuit <NUM> is a device that supplies power supplied from the commercial power supply <NUM> via the main switch <NUM> to each unit of the analysis controller <NUM>.

The memory <NUM> is a device that temporarily stores various types of information.

The storage medium <NUM> is a recording device that has recorded therein results of measuring a specimen set in the automatic analyzer <NUM>, analysis request information of a specimen stored in a specimen container placed in each specimen rack, and the like and is a semiconductor memory such as a flash memory, a magnetic disk such as an HDD (hard disk drive), or the like. The storage medium <NUM> also has recorded therein various control parameters and setting values of operations of each device in the automatic analyzer <NUM>, various computer programs for performing various processes such as a display process.

The input/output port <NUM> is a device that relays information between the CPU <NUM>, and the mechanism power supply circuit <NUM> and the actuator driving circuit <NUM> of the analyzer <NUM>.

The A/D converter <NUM> is a device that converts a detection signal from the photometer <NUM> from an analog format to a digital format and transmits the signal to the CPU <NUM>.

The above-described configuration is the entire configuration of the automatic analyzer <NUM>.

The configuration of the automatic analyzer is not limited to the configuration for analyzing biochemical analytical items as illustrated in <FIG>. The automatic analyzer can be an analyzer that performs analysis on other analytical items, such as an immunoassay apparatus that performs analysis on immunological analytical items. In addition, the biochemical analyzer is not limited to the configuration illustrated in <FIG> and can have a configuration obtained by appropriately adding various mechanisms or removing a mechanism, a configuration with another analyzer for measuring an electrolyte, a configuration in which the numbers of mechanisms illustrated in <FIG> are changed, or the like, for example.

In addition, the automatic analyzer is not limited to a single analysis module configuration as illustrated in <FIG> and can have a configuration in which two or more analysis modules capable of measuring various identical or different analytical items, or two or more preprocessing modules that performs a preprocess are connected by a transport device.

A process of analyzing a specimen by the automatic analyzer <NUM> described above is generally performed in the following order.

In accordance with an analytical parameter of an inspection item instructed for a single specimen, first, the dispensing mechanism <NUM> dispenses the specimen into the reaction container <NUM>. Next, the dispensing mechanism <NUM> dispenses the reagent to be used for analysis from the reagent container of the reagent cooler <NUM> into the reagent container <NUM> with the specimen dispensed therein. Subsequently, the stirring mechanism <NUM> stirs a mixed liquid of the specimen and the reagent in the reaction container <NUM> to prepare a reaction solution.

After that, light emitted from the light source <NUM> is transmitted through the reaction container <NUM> storing the reaction solution, and the photometer <NUM> measures the luminous intensity of the transmitted light, for example. The luminous intensity measured by the photometer <NUM> is transmitted to the CPU <NUM> via the A/D converter <NUM> of the analysis controller <NUM>.

The CPU <NUM> performs qualitative and quantitative analysis by performing arithmetic processing to calculate the concentration of a predetermined component within the specimen, causes the display unit <NUM> or the like to display the result of the qualitative and quantitative analysis, and stores the result of the qualitative and quantitative analysis to the storage medium <NUM>.

Next, control to change a flow rate of the circulating liquid such as the constant-temperature medium in the automatic analyzer <NUM> according to the present embodiment is described in detail with reference to <FIG> and <FIG>. <FIG> is a flow diagram illustrating the flow of an operation of the circulation pump. <FIG> is a diagram schematically illustrating details of the reaction tank.

In the automatic analyzer <NUM>, during the execution of the above-described analysis operation, the reaction container <NUM> is maintained at a constant temperature by the constant-temperature medium stored in the reaction tank <NUM>. This is due to the fact that it is necessary to cause the specimen to react with the reagent at a constant temperature in the reaction container <NUM>.

The constant-temperature medium is introduced into the automatic analyzer <NUM> from the outside of the automatic analyzer <NUM> through the liquid supply unit <NUM>. As the constant-temperature medium, water is used in many cases. This water is also used to clean each part such as the dispensing mechanism <NUM> in the automatic analyzer <NUM>.

The constant-temperature medium is circulated in the reaction tank <NUM> and the circulation path (flow path <NUM>) by the circulation pump <NUM> at a predetermined flow rate suitable to stabilize the temperature. It is assumed that the rotational speed of the circulation pump <NUM> in this case is a first rotational speed.

However, since a target object to be maintained at a constant temperature is not present in the reaction container <NUM> in a time period other than the time of the analysis operation, it is not necessary to circulate the constant-temperature medium at a flow rate equal to that at the time of the analysis operation. In addition, since the constant-temperature medium is not consumed when the constant-temperature medium is used for cleaning, it is not necessary to supply the constant-temperature medium and the constant-temperature medium does not flow in the liquid supply unit <NUM>.

It is known that when cleaning is not periodically performed in the liquid supply unit <NUM> and the reaction tank <NUM>, bacteria propagate and a biofilm is formed, for example, in a place where the flow rate is low or a place where the constant-temperature medium is stagnant, such as the wall surface of the reaction tank <NUM>.

Details are described with reference to <FIG>. The left of <FIG> is a diagram when the reaction tank <NUM> is viewed from a top surface and the right of <FIG> is a cross-sectional view of A-A' and a cross-sectional view of B-B'. The reaction tank <NUM> includes a recess 10a for adding a medical agent with antibacterial action or the like using the dispensing mechanism <NUM>, a constant-temperature medium circulation port 10b for supplying the constant-temperature medium from the flow path <NUM> into the reaction tank <NUM>, and an irregular portion such as a floating matter removal filter in the reaction tank <NUM>. In such a place, since the flow rate easily becomes low and the constant-temperature medium easily becomes stagnant, a biofilm is easily formed unless cleaning is periodically performed. In addition, an example of a place where a biofilm is easily formed is a back surface 10c of the constant-temperature medium circulation port 10b. The constant-temperature medium is supplied into the reaction tank in an arrow direction illustrated from a substantially circular pipe illustrated in the cross-sectional diagram of A-A'. Although the flow rate of the medium in the arrow direction is relatively high, the flow rate at a root of the back surface <NUM> on the opposite side is relatively low since the back surface 10c becomes a resistance to the flow and the constant-temperature medium easily becomes stagnant. Even in such a place, a biofilm is easily formed unless cleaning is not periodically performed.

In the present embodiment, control to suppress the generation of a biofilm is performed by increasing or changing the flow rate of the constant-temperature medium or of the liquid at predetermined time intervals, periodically, or at any time intervals a plurality of times, compared with that at the time of the analysis operation, such that analysis after analysis work or the like is not interrupted.

For example, since it is possible to suppress the formation of a thick biofilm by increasing the flow rate, it is possible to prevent a biofilm from growing to a large biofilm that interrupts analysis at the time of crossing an optical path.

The control of the flow rate of the circulating constant-temperature medium or liquid is desirably performed not to prevent the analysis after the above-described analysis work or the like and is performed by the CPU <NUM> transmitting a control signal to control the rotational speed of the circulation pump <NUM> to the actuator driving circuit <NUM> via the input/output port <NUM>. The control signal used in this case is referred to as a second control signal and the rotational speed of the circulation pump <NUM> used in this case is a second rotational speed.

The flow of the flow rate control is described below with reference to <FIG>.

As illustrated in <FIG>, first, when the CPU <NUM> receives, via the interface <NUM>, an analysis start command input by an operation of the operation unit <NUM> by the operator (step S201), the CPU <NUM> outputs a first control signal to the actuator driving circuit <NUM> via the input/output port <NUM> (step S202).

The actuator driving circuit <NUM> drives the circulation pump <NUM> at the first rotational speed based on the first control signal (step S203). This circulates the constant-temperature medium in the reaction tank <NUM> and the flow path <NUM> at the first flow rate.

After that, the CPU <NUM> determines whether the apparatus is performing analysis (step S204). When it is determined that the apparatus is performing the analysis, the process returns to step S204. When it is determined that the apparatus is not performing the analysis, the process proceeds to step S205.

Next, the CPU <NUM> outputs the second control signal to the actuator driving circuit <NUM> via the input/output port <NUM> (step S205).

The actuator driving circuit <NUM> drives the circulation pump <NUM> at the second rotational speed based on the second control signal (step S206). This circulates the constant-temperature medium in the reaction tank <NUM> and the flow path <NUM> at the second flow rate.

It is desirable that control be performed to set the second flow rate to, for example, <NUM> to <NUM> times the first flow rate. When the flow rate is increased, a biofilm is hardly formed but the constant-temperature medium may overflow from the reaction tank <NUM>. Therefore, the flow rate when the constant-temperature medium does not overflow from the reaction tank <NUM> is an upper limit. On the other hand, regarding a decrease in the flow rate, it is desirable that control be performed to set the second flow rate to be, for example, <NUM> to <NUM> times the first flow rate. When the flow rate is decreased, the flow changes due to a change in the flow rate without the suppression of the formation of a biofilm and the constant-temperature medium present in a place where the constant-temperature medium is stagnant can be efficiently replaced. Therefore, it can be expected to suppress the formation of a biofilm.

After that, the CPU <NUM> determines whether the CPU <NUM> has received an analysis start command from the operator (step S207). When it is determined that the command has been received, the process returns to step S202. When it is determined that the command has not been received, the process proceeds to step S208.

After that, the CPU <NUM> determines whether all analysis plans have been completed (step S208). When it is determined that all the analysis plans have been completed, the CPU <NUM> ends the process. When it is determined that not all the analysis plans have been completed, the process returns to step S207.

When the circulation flow path is provided in the liquid supply unit <NUM>, control is performed to change the flow rate in a similar manner.

Next, effects of the present embodiment are described below.

The automatic analyzer <NUM> according to the above-described first embodiment of the present invention includes the analyzer <NUM> that analyzes a specimen, the supply unit that stores and supplies the liquid to be used by the analyzer <NUM>, the analyzer circulation system that circulates the liquid present in the analyzer <NUM>, the supply unit circulation system that circulates the liquid present in the supply unit, and the analysis controller <NUM> that controls the operation of the automatic analyzer <NUM>. The analysis controller <NUM> switches at least one of the flow rate of the liquid circulated by the analyzer circulation system and the flow rate of the liquid circulated by the supply unit circulation system between the first flow rate at the normal time and the second flow rate different from the first flow rate.

Therefore, the flow occurs even in places where the constant-temperature medium or the liquid is stagnant in the liquid supply unit <NUM>, the reaction tank <NUM>, and the flow path <NUM> when the constant-temperature medium or the liquid is circulated at a constant flow rate, and the propagation of fungi that causes a biofilm is suppressed compared with conventional techniques. Therefore, it is possible to reduce the frequency of exchanging the liquid such as the constant-temperature medium and the frequency of work of cleaning the inside of the liquid supply unit <NUM>, the inside of the reaction tank <NUM>, and the inside of the flow path <NUM>, compared with conventional apparatuses. Therefore, the automatic analyzer can reduce a time period required for the operator to perform maintenance work and reduce a load.

An automatic analyzer according to a second embodiment of the present invention is described with reference to <FIG> and <FIG>. <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the second embodiment. <FIG> is a flow diagram illustrating the flow of an operation of a temperature adjusting mechanism. The same configurations as those described in the first embodiment are denoted by the same reference signs and a description thereof is omitted. The same applies to the following embodiments.

The automatic analyzer 100A according to the present embodiment illustrated in <FIG> performs temperature adjustment such that a constant-temperature medium is at a defined temperature appropriate for analysis at the time of an analysis operation in a similar manner to the automatic analyzer <NUM> according to the first embodiment. In addition, a CPU 53A of an analysis controller 50A performs control to heat the liquid by the temperature adjusting mechanism <NUM> at least once when all analysis for the day is completed and a power supply of the apparatus is turned off, when the apparatus is activated, when analysis is not planned to be performed by an analyzer 20A for a certain time period or longer, and at a predetermined time interval such that the temperature of the liquid becomes higher than that at the time of normal temperature adjustment.

More specifically, when the CPU 53A receives, via the interface <NUM>, a trigger signal to start heating control, such as a signal to turn off the power supply of the apparatus or a signal to turn on the power supply of the apparatus, based on an operation of the operation unit <NUM> by the operator, the CPU 53A outputs, to an actuator driving circuit <NUM> of the analyzer 20A via the input/output port <NUM>, a heat signal to start heating by the temperature adjusting mechanism <NUM>.

The CPU 53A constantly receives temperature information from the temperature sensor <NUM> via the input/output port <NUM>, transmits a signal based on the information to the actuator driving circuit <NUM> for driving the temperature adjusting mechanism <NUM> via the input/output port <NUM> to heat the constant-temperature medium at a temperature higher than <NUM> degrees at the normal time, such as a temperature of <NUM> degrees or higher, thereby sterilizing bacteria in the constant-temperature medium. The heating temperature may not be <NUM> degrees or higher and can be set according to the configuration of the apparatus or a condition for the operation.

The flow of the heating control according to the present embodiment is described below with reference to <FIG>. A case where the heading control is performed when the power supply of the apparatus is off is described with reference to <FIG>.

As illustrated in <FIG>, first, when the CPU 53A receives, via the interface <NUM>, a command to turn off the power supply of the apparatus that has been input by an operation of the operation unit <NUM> by the operator (step S301), the CPU 53A outputs a temperature increase signal to the actuator driving circuit <NUM> via the input/output port <NUM> (step S302) and the actuator driving circuit <NUM> increases output of the heater of the temperature adjusting mechanism <NUM> based on the temperature increase signal.

After that, the CPU <NUM> determines whether the temperature of the constant-temperature medium detected by the temperature sensor <NUM> is equal to or higher than <NUM> degrees (step S303). When it is determined that the temperature is lower than <NUM> degrees, the process returns to step S303.

On the other hand, when it is determined that the temperature is equal to or higher than <NUM> degrees, the process proceeds to step S304. Next, the CPU <NUM> outputs a temperature increase completion signal to the actuator driving circuit <NUM> and the mechanism power supply circuit <NUM> via the input/output port <NUM> (step S304). The actuator driving circuit <NUM> ends the operation of the temperature adjusting mechanism <NUM> based on the input temperature increase completion signal after a certain time period, the mechanism power supply circuit <NUM> completes the supply of power to the temperature adjusting mechanism <NUM> after a certain time period based on the input temperature increase completion signal, and the process is completed.

Other configurations and operations are substantially the same as those of the automatic analyzer <NUM> according to the above-described first embodiment and a description thereof is omitted.

Even the automatic analyzer 100A according to the second embodiment of the present invention can obtain effects similar to those of the automatic analyzer <NUM> according to the above-described first embodiment.

In addition, the temperature adjusting mechanism <NUM> that adjusts the temperature of the liquid in the analyzer circulation system is further provided. Since the analysis controller 50A controls the temperature adjusting mechanism <NUM> to cause the temperature adjusting mechanism <NUM> to heat the liquid at a temperature higher than that at the time of the normal temperature adjustment at least once when the power supply of the apparatus is turned off, when the apparatus is activated, when analysis is not planned to be performed by the analyzer 20A for a certain time period or longer, and at a predetermined time interval so that it is possible to more efficiently reduce the number of fertile bacteria in the reaction tank <NUM> and thus further reduce a load on the operator.

The present embodiment is not limited to an embodiment in which the constant-temperature medium is heated. Control may be performed to cool the constant-temperature medium when analysis is not performed for a certain time period or before the power supply of the apparatus is turned off. The heating and the cooling may be performed.

An automatic analyzer according to a third embodiment of the present invention is described with reference to <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the third embodiment.

The automatic analyzer 100B according to the present embodiment illustrated in <FIG> has a configuration obtained by adding, to the automatic analyzer <NUM> according to the first embodiment or the automatic analyzer 100A according to the second embodiment, ultraviolet light sources 14a and 14b that irradiate a constant-temperature medium or a liquid in an analyzer 20B with ultraviolet light to sterilize the constant-temperature medium.

As long as the ultraviolet light source 14a can irradiate the circulating constant-temperature medium with ultraviolet light, the ultraviolet light source 14a may be located at any position outside the circulation path. For example, the ultraviolet light source 14a can be located at a position in the reaction tank <NUM> or the like.

In addition, the ultraviolet light source 14b is not limited to the configuration for irradiating the liquid supplied from the liquid supply unit <NUM> toward each mechanism in the analyzer 20B with ultraviolet light. The ultraviolet light 14b can be configured to irradiate the liquid in the liquid supply unit <NUM> with ultraviolet light or irradiate the liquid constituting the circulation system for the supply unit with ultraviolet light.

In addition, the order of the temperature sensor <NUM>, the temperature adjusting mechanism <NUM>, the circulation pump <NUM>, and the ultraviolet light sources 14a and 14b that are illustrated in <FIG> is not limited to that illustrated in <FIG> and can be changed.

In the automatic analyzer 100B according to the present embodiment, a CPU 53B of an analysis controller 50B is configured to turn on the ultraviolet light sources 14a and 14b periodically at predetermined time intervals or at any time intervals a plurality of times. The CPU 53B can be configured to constantly turn on the ultraviolet light sources 14a and 14b.

For example, it is desirable that the ultraviolet light be emitted when analysis after analysis work or the like is not interrupted. In addition, when the circulation flow rate is not increased, the circulation flow rate of the constant-temperature medium can be reduced such that the sterilization efficiency of the ultraviolet light sources 14a and 14b is improved. Therefore, it is possible to increase a time period when the constant-temperature medium is present in irradiation ranges of the ultraviolet light sources 14a and 14b.

Other configurations and operations are substantially the same as those of the automatic analyzer <NUM> according to the above-described first embodiment or those of the automatic analyzer 100A according to the above-described second embodiment and a description thereof is omitted.

The automatic analyzer 100B according to the third embodiment of the present invention can obtain effects similar to those of the automatic analyzer <NUM> according to the above-described first embodiment and the like.

In addition, since the ultraviolet light sources 14a and 14b that irradiate the liquid with ultraviolet light are provided, it is possible to emit ultraviolet light with high bactericidal power and efficiently suppress the propagation of fungi. Therefore, it is possible to efficiently reduce the frequency of exchanging the liquid such as the constant-temperature medium and the frequency of work of cleaning the inside of the reaction tank <NUM>.

Furthermore, the analysis controller 50B can turn on the ultraviolet light sources 14a and 14b periodically at predetermined time intervals or at any time intervals at a plurality of times to efficiently suppress the propagation of fungi, suppress wear of the ultraviolet light sources 14a and 14b as compared with a case where the analysis controller 50B constantly turns on the ultraviolet light sources 14a and 14b, and contribute to a further reduction in maintenance.

An automatic analyzer according to a fourth embodiment of the present invention is described with reference to <FIG> and <FIG>. <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the fourth embodiment. <FIG> is a diagram schematically illustrating details of a stop controller and a liquid sterilizer together with a peripheral configuration.

The automatic analyzer 100C according to the present embodiment illustrated in <FIG> includes a relay <NUM>, the stop controller <NUM>, the liquid sterilizer <NUM>, and the like in addition to the automatic analyzer 100B according to the third embodiment.

In the automatic analyzer 100C according to the present embodiment illustrated in <FIG>, power is supplied from the commercial power supply <NUM> to the mechanism power supply circuit <NUM> and the control power supply circuit <NUM> via the main switch <NUM> and the relay <NUM>.

The main switch <NUM> has a function as a breaker that blocks the supply of power to the entire automatic analyzer when electric leakage, overcurrent, or the like occurs.

The relay <NUM> switches between the supply of power to the control power supply circuit <NUM> of the analysis controller <NUM> and the mechanism power supply circuit <NUM> of an analyzer 20C and the blocking of the supply of power to the control power supply circuit <NUM> of the analysis controller <NUM> and the mechanism power supply circuit <NUM> of an analyzer 20C. Control for the switching is performed based on a command from the stop controller <NUM>.

As illustrated in <FIG>, the stop controller <NUM> includes a stop controller memory 37a as a storage unit for storing various types of information, a controller 37b, a setting/abnormality information communication path <NUM> for transmission and reception of setting information and abnormality information to and from the CPU <NUM>, and the like.

The controller 37b controls an operation of the stop controller <NUM> based on information from the stop controller memory 37a and information from the liquid sterilizer <NUM>. Particularly, the controller 37b maintains a state in which power is supplied to the reagent cooler <NUM> and the ultraviolet light sources 14a and 14b of the liquid sterilizer <NUM>, and performs control to switch between a stopped state in which the supply of power to the relay <NUM>, that is, the supply of power to the analyzer 20C and the analysis controller <NUM> is blocked, and an activated state in which power is supplied to the analyzer 20C and the analysis controller <NUM>.

The controller 37b can be implemented by reading programs into a computer including a CPU, a memory, an interface, and the like or into a field-programmable gate array (FPGA) and causing the computer or the FPGA to perform calculation. These programs are stored an internal recording medium in each configuration or an external recording medium (not illustrated) and read and executed by the CPU.

The liquid sterilizer <NUM> includes the circulation pump <NUM> for circulating the constant-temperature medium, the ultraviolet light sources 14a and 14b that sterilize the constant-temperature medium, and a sterilization power supply circuit 38a that supplies power supplied from the commercial power supply <NUM> via the main switch <NUM> to each of the units of the liquid sterilizer <NUM>. Even in the stopped state, the power is supplied from the commercial power supply <NUM> via the main switch <NUM>.

In the stopped state, the ultraviolet light sources 14a and 14b may be continuously turned on, may be turned on periodically at predetermined time intervals in accordance with a command of the controller 37b of the stop controller <NUM>, or may be turned on at any time intervals a plurality of times in accordance with a command of the controller 37b of the controller <NUM>.

In addition, the controller 37b of the stop controller <NUM> may use the circulation pump <NUM> of the liquid sterilizer <NUM> to cause the flow rate of the constant-temperature medium at the time of the analysis operation to be different from the flow rate of the constant-temperature medium at time other than the time of the analysis operation in either one or both of the stopped state and a state other than the time of the analysis operation in the activated state as described in the first embodiment.

Furthermore, as described in the second embodiment, the temperature adjusting mechanism <NUM> can perform heating control on the liquid or the constant-temperature medium.

Other configurations and operations are substantially the same as those of the automatic analyzer 100B according to the above-described third embodiment and a description thereof is omitted.

The automatic analyzer 100C according to the fourth embodiment of the present invention can obtain effects similar to those of the automatic analyzer 100B according to the above-described third embodiment.

In addition, the relay <NUM> that switches between the supply of power to the analyzer 20C and the analysis controller <NUM> and the blocking of the supply of power to the analyzer 20C and the analysis controller <NUM>, and the stop controller <NUM> that maintains a state in which power is supplied to the ultraviolet light sources 14a and 14b and that switches between the stopped state in which the supply of power to the analyzer 20C and the analysis controller <NUM> is blocked and the activated state in which power is supplied to the analyzer 20C and the analysis controller <NUM> are further provided. Thus, even when the power supply of the automatic analyzer 100C is off, it is possible to irradiate the liquid within the liquid supply unit <NUM> and the like with ultraviolet light. Therefore, even when analysis is not performed for a long time period, it is possible to efficiently suppress the propagation of germs in the liquid and efficiently further reduce a load on the operator.

An automatic analyzer according to a fifth embodiment of the present invention is described with reference to <FIG>. <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the fifth embodiment. <FIG> and <FIG> are diagrams illustrating examples of screens displayed on the display unit when amounts of light of the ultraviolet light sources become lower than a defined value. <FIG> is a diagram illustrating an example of a screen displayed on the display unit when an abnormal amount of the liquid is detected.

The automatic analyzer 100D according to the present embodiment illustrated in <FIG> includes, in a liquid sterilizer 38D of an analyzer 20D, a lighting detection sensor that detects an abnormality in the ultraviolet light sources 14a and 14b, and a liquid amount sensor that detects the amount of the constant-temperature medium in the reaction tank <NUM>, in addition to the automatic analyzer 100C according to the fourth embodiment. The lighting detection sensor <NUM> needs to be located in a range in which ultraviolet light emitted from the ultraviolet light sources 14a and 14b reaches the lighting detection sensor <NUM>. The liquid amount sensor <NUM> may be located in the reaction tank <NUM> or outside the reaction tank <NUM>. The position of the liquid amount sensor <NUM> is not particularly limited as long as the liquid amount sensor <NUM> can detect the amount of the liquid.

In the automatic analyzer 100D according to the present embodiment, when it is determined that an abnormality occurs in the ultraviolet light sources 14a and 14b based on information of the lighting detection sensor <NUM>, a stop controller 37D notifies the operator of the abnormality by a method in which information indicating that the abnormality has been detected is displayed on the display unit <NUM>.

<FIG> illustrates the example of the screen displayed on the display unit <NUM> when amounts of light of the ultraviolet light sources 14a and 14b are smaller than an amount specified by the controller 37b. As illustrated in <FIG>, "Caution: A decrease in the intensity of the ultraviolet light source has been detected. " is displayed as alarm information 54a on the display unit <NUM>.

In addition, <FIG> illustrates the example of the screen displayed on the display unit <NUM> when amounts of light of the ultraviolet light sources 14a and 14b become lower than the defined value. As illustrated in <FIG>, "Alarm: The ultraviolet light source needs to be replaced. " is displayed as alarm information 54b on the display unit <NUM>. Therefore, the operator can easily recognize that the ultraviolet light sources 14a and 14b need to be replaced.

In addition, the stop controller 37D can block the supply of power to the ultraviolet light sources 14a and 14b based on information of the lighting detection sensor <NUM>. For example, when the amounts of light of the ultraviolet light sources 14a and 14b become lower than the defined value, the stop controller <NUM> can transmit, to the mechanism power supply circuit <NUM>, a signal to block the supply of power to the ultraviolet light sources 14a and 14b.

In addition, for example, even in a case where it is determined that an abnormality such as a failure of the ultraviolet light sources 14a and 14b is present based on information of the lighting detection sensor <NUM>, the stop controller 37D can enable the apparatus when maintenance work is periodically carried out.

In addition, in the present embodiment, the liquid sterilizer 38D is incorporated in the temperature sensor <NUM> and power is supplied even in the stopped state.

In addition, the stop controller 37D can adjust the intensities of ultraviolet light emitted by the ultraviolet light sources 14a and 14b based on temperature information of the liquid measured by the temperature sensor <NUM> of the liquid sterilizer 38D. In addition, the stop controller 37D outputs, to the circulation pump <NUM> of the liquid sterilizer 38D, a command to control at least one of the flow rate of the liquid in the analyzer circulation system and the flow rate of the liquid in the supply unit circulation system as in the first embodiment. The stop controller 37D may control both of the flow rates or may control either one of the flow rates.

Furthermore, in the present embodiment, the temperature adjusting mechanism <NUM> is incorporated in the liquid sterilizer 38D and power is supplied even in the stopped state.

In addition, the stop controller 37D can cause the temperature adjusting mechanism <NUM> to heat the constant-temperature medium at a temperature of <NUM> degrees or higher to sterilize the constant-temperature medium. Alternatively, the stop controller 37D can cool the constant-temperature medium at a temperature of <NUM> degrees or lower to reduce the propagation speed of bacteria. Therefore, it is possible to set the temperature of the constant-temperature medium to a temperature unsuitable for the propagation of fungi and suppress the propagation of fungi in the constant-temperature medium.

In addition, in the present embodiment, when it is determined that the amount of the liquid detected by the liquid amount sensor <NUM> is abnormal in the stopped state or the like, the stop controller 37D can notifies the operator of the abnormality by displaying, on the display unit <NUM>, information indicating that the fact that the amount of the constant-temperature medium is an abnormal value has been detected.

<FIG> illustrates the example of the screen displayed on the display unit <NUM> when an abnormal amount of the constant-temperature medium is detected. As illustrated in <FIG>, "Alarm: The sterilization process has been temporarily stopped. " is displayed as alarm information 54c on the display unit <NUM>.

In addition, instead of or in addition to the notification of the abnormality to the operator, the stop controller 37D can output, to the sterilization power supply circuit 38a of the liquid sterilizer 38D, a command signal to block the supply of power to each of the units of the liquid sterilizer 38D, such as the ultraviolet light sources 14a and 14b.

Furthermore, instead of or in addition to the notification of the abnormality to the operator and the blocking of the supply of power to each of the units of the liquid sterilizer 38D, the stop controller 37D can increase or reduce the amount of the liquid from the liquid supply unit <NUM>. In this case, it is desirable that the liquid supply unit <NUM> be able to reduce the constant-temperature medium in amount.

When the supply of power to the liquid sterilizer <NUM> is blocked, the constant-temperature medium is not sterilized and thus it is necessary to carry out maintenance work such as cleaning of the reaction tank <NUM> and exchange of the constant-temperature medium at the time of the activation of the apparatus.

In the present embodiment, when the controller 37b determines that the amount of the constant-temperature medium deviates from a defined normal value based on information of the liquid amount sensor <NUM>, the liquid supply unit <NUM> can increase or reduce the constant-temperature medium in amount.

Other configurations and operations are substantially the same as those of the automatic analyzer 100C according to the above-described fourth embodiment and a description thereof is omitted.

The automatic analyzer 100D according to the fifth embodiment of the present invention can obtain effects similar to those of the automatic analyzer 100C according to the above-described fourth embodiment.

In addition, since the lighting detection sensor <NUM> that detects an abnormality in the ultraviolet light sources 14a and 14b is further provided, it is possible to early detect an abnormality in the ultraviolet light sources 14a and 14b. It is also possible to suppress the occurrence of a situation in which sterilization by ultraviolet light is not performed, and it is possible to easily reduce maintenance.

Furthermore, by notifying the operator of an abnormality based on information of the lighting detection sensor <NUM>, the operator can recognize a decrease in the sterilizing effects of the ultraviolet light sources 14a and 14b and recognize that it is almost time to replace the ultraviolet light sources 14a and 14b. Therefore, it is possible to reliably suppress the occurrence of a situation in which sterilization by ultraviolet light is not performed.

In addition, by blocking the supply of power to the ultraviolet light sources 14a and 14b based on information of the lighting detection sensor <NUM>, it is possible to prevent power from being unnecessarily supplied to the ultraviolet light sources 14a and 14b in which an abnormality is likely to occur, and suppress the occurrence of a serious abnormality. Therefore, it is possible to prevent the number of portions requiring maintenance from increasing more than necessary, and similarly, it is possible to more easily reduce the maintenance work time.

Furthermore, since the liquid amount sensor <NUM> that detects the amount of the liquid in the analyzer circulation system or the amount of the liquid in the supply unit circulation system is provided, it is possible to determine whether or not the amount of the liquid or the constant-temperature medium in the apparatus is abnormal and it is possible to suppress the occurrence of a failure such as interruption of analysis due to an insufficient amount of the liquid.

In addition, by notifying the operator of the abnormality based on information of the liquid amount sensor <NUM>, it is possible for the operator to recognize that work of sterilizing the constant-temperature medium has been interrupted and recognize that some handling is necessary. Furthermore, by blocking the supply of power to the ultraviolet light sources 14a and 14b or increasing or decreasing the liquid in amount, it is possible to maintain the amount of the constant-temperature medium at a certain level even in the stopped state and avoid maintenance work associated with the supply of power to the liquid sterilizer <NUM> since the supply of power to the liquid sterilizer <NUM> is not blocked.

Furthermore, the propagation rate of fungi depends on the temperature, and the temperature of the constant-temperature medium in the stopped state depends on the temperature of the environment in which the apparatus is installed. Therefore, by controlling at least any one of the intensities of ultraviolet light emitted by the ultraviolet light sources 14a and 14b, the flow rate of the liquid in the analyzer circulation system, and the flow rate of the liquid in the supply unit circulation system, it is possible to appropriately perform sterilization work based on the state of the apparatus and easily reduce a load on the operator.

An automatic analyzer according to a sixth embodiment of the present invention is described with reference to <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the sixth embodiment.

The configuration of the automatic analyzer 100E according to the present embodiment illustrated in <FIG> is substantially the same as that of the automatic analyzer 100C according to the fourth embodiment illustrated in <FIG>. The automatic analyzer 100E turns on the ultraviolet light sources 14a and 14b periodically at predetermined time intervals or at any time intervals a plurality of times even in the stopped state of the apparatus.

A difference from the automatic analyzer 100C illustrated in <FIG> is that the automatic analyzer 100C uses the circulation pump <NUM> of the liquid sterilizer <NUM> to perform control to change the flow rate of the constant-temperature medium between the flow rate at the time of the analysis operation and the flow rate at time other than the time of the analysis operation, but the automatic analyzer 100E according to the present embodiment does not perform such flow rate control in a liquid sterilizer 38E of an analyzer 20E and the analysis controller <NUM>. In addition, the temperature adjusting mechanism <NUM> does not perform control to heat the constant-temperature medium.

In the sixth embodiment of the present invention, the automatic analyzer 100E includes a relay <NUM> that switches between the supply of power to the analyzer 20E and the analysis controller <NUM> and blocking of the supply of power to the analyzer 20E and the analysis controller <NUM>, and a stop controller 37E that maintains a state in which power is supplied to the ultraviolet light sources 14a and 14b and that switches between the stopped state in which the supply of power to the analyzer 20E and the analysis controller <NUM> is blocked and an activated state in which power is supplied to the analyzer 20E and the analysis controller <NUM>. According to the automatic analyzer 100E, it is possible to sterilize the constant-temperature medium by the ultraviolet light sources 14a and 14b not only in the activated state of the apparatus but also in the stopped state. Therefore, even in the stopped state, it is possible to efficiently suppress the propagation of bacteria in the reaction tank <NUM> and thus it is possible to obtain effects similar to the automatic analyzer <NUM> according to the above-described first embodiment.

An automatic analyzer according to a seventh embodiment of the present invention is described with reference to <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the seventh embodiment.

The configuration of the automatic analyzer 100F according to the present embodiment illustrated in <FIG> is substantially the same as that of the automatic analyzer 100E according to the sixth embodiment illustrated in <FIG>. A stop controller 37F turns on ultraviolet light sources 14a and 14b of a liquid sterilizer 38F periodically at predetermined time intervals or at any time intervals a plurality of times even in the stopped state of the apparatus and the like.

In the automatic analyzer 100F according to the present embodiment, the stop controller 37F performs control to switch at least one of the flow rate of the liquid circulated by the analyzer circulation system and the flow rate of the liquid circulated by the supply unit circulation system between the first flow rate at normal time and the second flow rate different from the first flow rate during the stop of analysis and at time around turning off of a power supply.

In addition, instead of or in addition to the flow rate control, the stop controller 37F performs control to heat the liquid at a temperature higher than that at the time of normal temperature adjustment by the temperature adjusting mechanism <NUM> at least once when the power supply of the apparatus is turned off, when the apparatus is activated, when analysis is not planned to be performed by the analyzer 20F for a certain time period, and at a predetermined time interval.

Other configurations and operations are substantially the same as those of the automatic analyzer 100E according to the above-described sixth embodiment and a description thereof is omitted.

The automatic analyzer 100F according to the seventh embodiment of the present invention can obtain effects similar to those of the automatic analyzer 100E according to the above-described sixth embodiment and effects specific to the fourth embodiment or effects specific to the second embodiment.

An automatic analyzer according to an eighth embodiment of the present invention is described with reference to <FIG> is a diagram schematically illustrating an entire configuration of the automatic analyzer according to the eighth embodiment.

The automatic analyzer <NUM> according to the present embodiment illustrated in <FIG> is substantially the same as the automatic analyzer 100D according to the fifth embodiment illustrated in <FIG>.

In the automatic analyzer <NUM> according to the present embodiment, in a case where the stop controller 37F turns on the ultraviolet light sources 14a and 14b in a liquid sterilizer <NUM> of an analyzer <NUM> periodically at predetermined time intervals or at any time intervals a plurality of times in the stopped state of the apparatus and the like, the stop controller 37F performs abnormality notification control based on a detection result of the lighting detection sensor <NUM> and performs control to block the supply of power to the ultraviolet light sources 14a and 14b. Alternatively or in addition, the stop controller 37F notifies the operator of an abnormality, blocks the supply of power to the ultraviolet light sources 14a and 14b, and performs control to increase or decrease the amount of the liquid based on information of the liquid amount sensor <NUM>. Furthermore, the stop controller 37F controls at least one of intensities of ultraviolet light emitted by the ultraviolet light sources 14a and 14b, the flow rate of the liquid in the analyzer circulation system, and the flow rate of the liquid in the supply unit circulation system.

Other configurations and operations are substantially the same as those of the automatic analyzer 100D according to the above-described fifth embodiment and a description thereof is omitted.

The automatic analyzer <NUM> according to the eighth embodiment of the present invention can obtain effects similar to those of the automatic analyzer 100E according to the sixth embodiment described above and effects specific to the fifth embodiment.

The embodiments are described in detail to clearly explain the present invention and are not necessarily limited to those having all the configurations described.

Claim 1:
An automatic analyzer (<NUM>; 100A-<NUM>) comprising:
an analyzer (<NUM>; 20A-<NUM>) that analyzes a specimen;
a supply unit (<NUM>) that stores and supplies a liquid to be used by the analyzer (<NUM>; 20A-<NUM>);
an analyzer circulation system (<NUM>-<NUM>, <NUM>) that circulates the liquid existing in the analyzer (<NUM>; 20A-<NUM>) and the supply unit (<NUM>); and
a controller (<NUM>; 50A; 50B) that controls an operation of the automatic analyzer (<NUM>; 100A-<NUM>),
wherein the controller (<NUM>; 50A; 50B) switches a flow rate of the liquid circulated by the analyzer circulation system (<NUM>-<NUM>, <NUM>) between a first flow rate in a normal state and a second flow rate different from the first flow rate,
wherein
the automatic analyzer (<NUM>; 100A-<NUM>) further comprises a temperature adjuster (<NUM>) that adjusts the temperature of the liquid within the analyzer circulation system (<NUM>-<NUM>, <NUM>),
the liquid within the analyzer circulation system (<NUM>-<NUM>, <NUM>) is water, characterized in that
the controller (<NUM>; 50A; 50B) heats the liquid to a temperature of <NUM> or higher and higher than the temperature of the liquid in normal temperature adjustment by the temperature adjuster (<NUM>) when a device power supply (<NUM>) is turned off, or when the automatic analyzer (<NUM>; 100A-<NUM>) is activated, or when the analysis is not planned for a certain time period or longer in the analyzer (<NUM>; 20A-<NUM>), or at predetermined time intervals.