JP6274081B2 - Liquid collection device and automatic analyzer equipped with the liquid collection device - Google Patents

Description

  The present invention relates to a liquid collection device that collects a liquid contained in a container via a probe, and an automatic analyzer including the liquid collection device.

  For example, an automatic analyzer dispenses a predetermined amount of a sample into a reaction container, adds a predetermined amount of reagent to the sample, and then optically measures the reaction in the reaction container at a predetermined measurement unit. The action is automatically executed. Various reagents added to the specimen are installed in a predetermined reagent storage unit of the apparatus by an operator, and information on the installed reagent and the installation position are associated with each other and registered on the apparatus side.

  In such an automatic analyzer, the work of collecting the sample from the sample container and dispensing it into the reaction container, or the work of collecting the reagent installed in the reagent container and dispensing it into the reaction container is performed by sucking and discharging the liquid. Generally, this is performed using a probe to be performed. In that case, place the probe at a position on the container containing the target sample or reagent, lower it from the probe tip, enter the tip of the probe into the container, inhale the liquid, and then move the probe to the position of the reaction container Dispense the inhaled liquid into the reaction container.

  In the above-described automatic analyzer, when the sample or reagent is inhaled by the probe, the tip of the probe is used to prevent the probe from being immersed in the sample or reagent more than necessary and contaminated. There is a case where a liquid level sensor that detects that the liquid is in contact with the liquid level is provided (for example, see Patent Document 1). In this case, the probe is lowered from above the liquid to be inhaled and the position of the probe when the tip of the probe comes into contact with the liquid is detected based on the liquid level sensor, and the probe is lowered by a necessary distance from that position. By inhaling the liquid, it is possible to prevent the outer surface of the probe from being unnecessarily contaminated with the specimen or reagent.

  In addition, by detecting the height of the probe when the tip of the probe comes into contact with the liquid by the liquid level sensor, the liquid level in the container can be obtained, so the remaining amount of liquid to be inhaled is automatically determined. The function of recognizing is also realized.

Japanese Patent No. 5093164

  A sample of an automatic analyzer includes serum, but the reagent added to such a sample often contains a surfactant, and bubbles are generated on the liquid surface of such a reagent. Cheap. However, in the liquid level sensor provided in the apparatus, even when the tip of the probe is in contact with the bubble, it is detected in the same manner as when the probe is in contact with the liquid level. It cannot be distinguished whether it was detected. Therefore, when bubbles are generated on the liquid level of the reagent, when the tip of the probe comes into contact with the bubbles and the liquid level sensor detects the bubble, the reagent inhaling operation is executed based on the position, and a predetermined amount The reagent is not inhaled, and the reliability of the analysis result for the sample to which the reagent is added becomes low. Furthermore, even if the reliability of the analysis result is reduced due to bubbles on the liquid level of the reagent, it is difficult for the operator to recognize it.

  In addition to the liquid level sensor, a pressure sensor may be added to detect whether the probe tip is in contact with the liquid level or bubbles by detecting a minute change in pressure applied to the probe. However, since it is necessary to add a pressure sensor in addition to the liquid level sensor, there is a problem that the apparatus cost is increased and a minute change in pressure needs to be detected with high accuracy, so that adjustment of the sensor is difficult.

  In view of the above, an object of the present invention is to make it possible to detect bubbles generated on a liquid surface to be inhaled using a liquid level sensor without adding a new sensor.

  One embodiment of a liquid sampling apparatus according to the present invention includes a probe, a probe drive mechanism, a pump, a liquid level sensor, a probe operation control means, a liquid level detection means, a post-inhalation liquid level calculation means, and a liquid level height. A storage unit, a first threshold holding unit, a second threshold holding unit, a difference calculation unit, a bubble detection unit, and a warning display unit are provided.

  The liquid level sensor of this embodiment detects that the tip of the probe has contacted the liquid level. The probe drive mechanism drives the probe at least in the vertical direction, and the probe operation control means is configured to control the probe drive mechanism and the pump so that the probe lowering operation and the suction operation are executed. The liquid level detection means is configured to detect the level of the liquid before the suction operation by detecting the position of the probe when the probe tip contacts the liquid level during the probe lowering operation. is there. The liquid level height calculating means after inhalation is based on the liquid level height before the inhaling operation detected by the liquid level detecting means and the amount of inhalation during the inhaling operation. The liquid level storage unit stores the theoretical value of the liquid level.

  The first threshold holding unit holds a preset first threshold, and the second threshold holding unit holds a preset second threshold. The first threshold is an error that is allowed as a difference between the theoretical value of the liquid level after the suction operation calculated by the post-suction liquid level calculation means and the actual liquid level after the suction operation. Is the maximum value. The second threshold value is set larger than the first threshold value.

  The difference calculation means stores the liquid level detected by the liquid level detection means and the liquid level height storage unit when performing the second and subsequent probe lowering operations on the same inhalation target container. It is configured to calculate a difference from the theoretical value of the liquid level after the suction operation for the container. The bubble detection means compares the difference value calculated by the difference calculation means with the first threshold value and the second threshold value, the difference value exceeds the first threshold value, and the second threshold value is detected. It is configured to detect the presence of foam when it is below the threshold value, and the warning display means informs that in a manner that the operator can recognize when the foam detection means detects the presence of foam. It is configured to output.

  In other words, in this embodiment, the liquid level after the suction operation obtained by calculation based on the liquid level detected during the previous probe lowering operation and the actual detection during the current probe lowering operation. The difference between the measured liquid level and the difference exceeds the first threshold set as the maximum allowable error set in advance on the apparatus side, and is set larger than the first threshold. It is configured to detect the presence of the foam when it is below the second threshold value, and to display a warning to the operator when the presence of the foam is further detected.

  In a further preferred embodiment of the liquid sampling apparatus according to the present invention, the liquid level storage unit also stores an initial value of the liquid level of the liquid stored in the container, and the difference calculating means The liquid level height detected by the liquid level detection means when performing the first probe lowering operation on the container and the initial value of the liquid level height of the liquid in the container held in the initial value holding unit It is preferable that the difference is calculated so as to be calculated as the difference value used by the bubble detection means for detecting bubbles. Thereby, when performing the 1st inhalation operation | movement with respect to the newly installed container, it can be detected whether the bubble has generate | occur | produced in the container.

  By the way, when the second threshold value is set smaller than the maximum value of the size of the bubble that can be generated on the liquid level in the container, the generation of the bubble is not detected even though the bubble is generated. Things happen. Further, if the second threshold value is set so as to greatly exceed the maximum value of the size of bubbles that can be generated on the liquid level in the container, for example, the reagent container to be inhaled is a new reagent container. Even when the reagent is exchanged or when the reagent is replenished by the operator, it may be recognized that bubbles are generated. Therefore, as the second threshold value, an extremely small value or a large value compared to the maximum value of the size of bubbles that can be generated is not a preferable value. Therefore, the second threshold value is preferably set based on the maximum value of the size of bubbles that can be generated on the liquid level in the container.

  When a plurality of containers containing liquids to be inhaled by the probe are provided and the second threshold value is individually set for each type of liquid to be inhaled, depending on the type of liquid to be inhaled Threshold selection means for selecting a second threshold value is further provided, and the bubble detection means is configured to detect the presence of the bubble using the second threshold value selected by the threshold selection means. It is preferable. This is because the size of bubbles generated on the surface of the liquid to be inhaled may vary depending on the type (nature) of the liquid.

  In addition, when a plurality of containers that contain the liquid to be inhaled by the probe are provided, and the second threshold value is set individually for each size or shape of the container that contains the liquid to be inhaled, The apparatus further comprises threshold selection means for selecting the second threshold in accordance with the size or shape of the container containing the liquid to be inhaled, and the bubble detection means is configured to select the second threshold selected by the threshold selection means. It is preferable to be configured to detect the presence of bubbles using a threshold value. This is because the size of bubbles generated on the liquid surface of the liquid to be inhaled may vary depending on the size and shape of the container that stores the liquid.

  When there are a plurality of containers that contain the liquid to be inhaled by the probe, the first threshold value is also set individually for each size or shape of the container that contains the liquid to be inhaled. Preferably it is. This is because the error in the liquid level after inhalation due to the accuracy of inhalation by the pump varies depending on the size and shape of the container. In that case, the container that contains the liquid to be inhaled further includes threshold selection means that selects the first threshold according to the size or shape of the container that contains the liquid to be inhaled, the bubble detection means, The first threshold value selected by the threshold value selection means is used to detect the presence of bubbles.

  Further, the bubble detecting means detects that the container containing the liquid to be inhaled is a new container when the difference value calculated by the difference calculating means exceeds the second threshold value. It is preferable to be configured. Then, for example, when the reagent container is replaced with a new one or filled with a reagent, the apparatus can automatically recognize it.

  Further, as an example of a preferred embodiment, a probe operation control unit, a liquid level detection unit, a post-inhalation liquid level calculation unit, a liquid level storage unit, a threshold value holding unit, a difference calculation unit, and a bubble detection unit are provided. An arithmetic control device provided, and an information display unit connected to the arithmetic control device and displaying information possessed by the arithmetic control device, wherein the warning display means detects the presence of bubbles when the bubble detection means detects the presence of bubbles. What is comprised so that an effect may be displayed on an information display part is mentioned.

  One embodiment of an automatic analyzer according to the present invention comprises a sample collecting mechanism for collecting a sample from a sample container containing a sample and dispensing the sample into a reaction container for reacting the sample, and the liquid collecting device of the present invention. And a reagent dispensing mechanism that draws the reagent from the reagent container containing the reagent and dispenses it into the reaction container, and a measurement unit that measures the inside of the reaction container containing the sample and the reagent.

  As an example of a further preferred embodiment of the automatic analyzer, a plurality of analyzers each including a sample collection mechanism, a reagent dispensing mechanism, and a measurement unit are provided, and each of the analyzers holds a plurality of sample containers. A belt conveyor that conveys the sample rack in one direction is provided, and among the analyzers arranged adjacent to each other, the end of one belt conveyor and the start of the other belt conveyor are arranged to face each other. The conveyors may be connected by an inter-device transport device having a transport mechanism that holds the sample rack that has reached the end of one belt conveyor and transports the sample rack to the start end of the other belt conveyor.

  In one embodiment of the liquid sampling apparatus of the present invention, the liquid level after the suction operation obtained by calculation based on the liquid level detected during the previous probe lowering operation and the current probe lowering operation A difference from the actually detected liquid level is taken, and the difference exceeds a first threshold set as a maximum value of an allowable error set in advance on the apparatus side. Since it is configured to detect the presence of bubbles when it is less than or equal to the second threshold value set larger than the value, bubbles generated on the liquid surface without providing a new sensor such as a pressure sensor Can be detected. Furthermore, since it is configured to display a warning to the operator when the presence of bubbles is detected, the operator can easily recognize that bubbles are generated on the liquid surface.

  In one embodiment of the automatic analyzer of the present invention, since the reagent dispensing mechanism is configured by the liquid sampling device of the present invention, bubbles are generated on the liquid surface in the reagent container containing the reagent to be added to the specimen. It can be detected and the operator can recognize it.

It is a schematic block diagram which shows one Example of a liquid sampling device. It is a figure which shows roughly the mechanism of the probe periphery of the Example. It is a flowchart which shows the extraction and dispensing operation | movement of the liquid of the Example. It is a schematic block diagram which shows the other Example of a liquid collection apparatus. It is a flowchart which shows the extraction and dispensing operation | movement of the liquid of the Example. It is a schematic block diagram which shows one Example of an automatic analyzer. It is a top view which shows the structure of the Example roughly. It is a top view which shows the transport mechanism of the transport apparatus between apparatuses in the Example. It is a front view of the transport mechanism. It is the disassembled perspective view seen from the diagonal upper side of the transport mechanism. It is the disassembled perspective view seen from the diagonal lower side of the transport mechanism. It is a block diagram which shows the control system of the Example.

Example 1
An embodiment of the liquid collection device will be described.

  As shown in FIG. 1, the liquid sampling apparatus includes a probe 2, a pump 4, a probe driving mechanism 5, a liquid level sensor 8, an arithmetic control device 10, and an information display unit 30. The pump 4 is, for example, a syringe pump, and sucks and discharges liquid via the probe 2. The probe drive mechanism 5 drives the probe 2 in the horizontal plane direction and the vertical direction. The liquid level sensor 8 is a capacitance sensor that detects a change in capacitance when the tip of the probe 2 comes into contact with the liquid level, thereby detecting contact with the liquid level by the tip of the probe 2. is there.

  As shown in FIG. 2, the tip of the probe 2 is held at the tip of the arm 34 in a vertically downward state. The base end portion of the arm 34 is supported by a support shaft 32 arranged in a vertical direction, and the tip end of the arm 34 extends in the horizontal direction. The support shaft 32 is rotated in the horizontal plane and vertically moved in the vertical direction by the vertical drive unit 6 and the rotary drive unit 7 constituting the probe drive mechanism 5, thereby moving the probe 2 held by the arm 34 in the horizontal plane direction. Can be moved to draw an arc, and further moved up and down at a position on the trajectory. Each of the vertical drive unit 6 and the rotary drive unit 7 includes a pulse motor as a component, and the position of the probe 2 can be controlled by the number of pulses applied to the pulse motor. The proximal end of the probe 2 is connected to the syringe pump 4 via a tube 36.

  A sensor substrate 8 (liquid level sensor) is provided inside the arm 34. The sensor substrate 8 detects a change in electrostatic capacitance between the tip of the probe 2 and the liquid level when the tip of the probe 2 comes into contact with the liquid level.

  Returning to FIG. 1, the arithmetic and control unit 10 controls the operation of the pump 4 and the probe driving mechanism 5 and performs various arithmetic processes based on the detection signal from the liquid level sensor 8. The information display unit 30 displays information that the arithmetic control device 10 has. The arithmetic and control unit 10 is realized by, for example, a general-purpose personal computer (PC) or a dedicated computer. The information display unit 30 is realized by, for example, a general-purpose PC monitor or a dedicated monitor.

  The arithmetic and control unit 10 includes a probe operation control unit 12, a liquid level detection unit 14, a post-inhalation liquid level calculation unit 16, a difference calculation unit 18, a bubble detection unit 20, a warning display unit 22, and a liquid level storage unit. 24, a first threshold value holding unit 25 and a second threshold value holding unit 26 are provided. The probe operation control means 12, the liquid level detection means 14, the post-inhalation liquid level height calculation means 16, the difference calculation means 18, the bubble detection means 20, and the warning display means 22 are incorporated in the arithmetic control device 10. This function is realized by a program and a calculation unit (CPU) that executes the program. The liquid level storage unit 24, the first threshold value holding unit 25, and the second threshold value holding unit 26 are realized by a hard disk or a non-volatile memory provided in the arithmetic control device 10.

  The probe operation control means 12 is a probe lowering operation for lowering the probe 2 from the position on the container containing the target liquid based on the dispensing conditions designated by the operator for the liquid to be inhaled, and the liquid in the container is assigned. The pump 4 and the probe drive mechanism 5 are controlled to execute an inhaling operation for inhaling only a fixed amount and a dispensing operation for dispensing the inhaled liquid to a predetermined dispensing position. The probe lowering operation is performed based on the detection signal of the liquid level sensor 8, and the probe 2 is stopped at a position where the tip is further lowered by a certain distance from the height at which the tip contacts the liquid level. The inhalation operation is executed at that position.

The liquid level detection means 14 determines the height of the probe 2 when the tip of the probe 2 is in contact with the liquid level based on the detection signal of the liquid level sensor 8 during the probe lowering operation, for example, the probe driving mechanism 5. This is obtained from the number of pulses given to the pulse motor, and thereby the liquid level height H ₁ in the container is detected. The liquid level height H ₁ detected here is the liquid level height before the suction operation is executed. The detected liquid level height H ₁ is stored in the liquid level height storage unit 24.

The initial value of the amount of liquid stored in the container to be inhaled is input to the device when the container is installed, and the liquid level in the container is based on the input value. Is stored in the liquid level storage 24 as the initial value H ₀ . The initial value H ₀ of the liquid level in the container is used to determine the presence or absence of bubbles on the liquid level when performing the first liquid suction operation from the container. The initial value H ₀ of the liquid level is replaced with a theoretical value H ₀ of the liquid level after inhalation obtained by the after-inhalation liquid level height calculating means 18 to be described later after the first inhaling operation is completed. The theoretical value H ₀ is used for detection of bubbles in the second and subsequent liquid suction operations.

The post-inhalation liquid level calculation means 18 uses the liquid level height H ₁ before execution of the suction operation detected by the liquid level detection means 14 and corresponds to the liquid suction amount from the liquid level height H _1. The liquid level height H ₀ after the suction operation after subtracting the height to be calculated is calculated. The liquid level height H ₀ calculated by the liquid level height calculation means 18 after inhalation is not the actual liquid level after inhalation but the theoretical value of the liquid level obtained by calculation based on the inhalation conditions. is there. The calculated liquid level height theoretical value H ₀ is also stored in the liquid level storage 24. This theoretical value H ₀ is used for calculation of the difference ΔH by the difference calculation means 18 described later after the next probe lowering operation executed for the same container.

When the liquid level height detecting means 14 detects the liquid level height H ₁ in the container, the difference calculating means 18 calculates the post-inhalation liquid level height calculating means 18 at the time of the previous liquid collection for the same container. The difference ΔH (= H ₁ −H ₀ ) between the theoretical value H ₀ calculated by the above and the liquid level height H ₁ detected this time is calculated.

  The bubble detection unit 20 uses the difference ΔH calculated by the difference calculation unit 18 and is held by the first threshold value holding unit 25 and the second threshold value holding unit 26. On the basis of the second threshold value, it is configured to detect whether or not bubbles are generated on the liquid level of the container to be inhaled.

It can be said that the liquid level height H ₁ detected by the liquid level detection means 14 is an actual measurement value of the liquid level after the previous suction of the liquid. H ₀ is a theoretical value obtained by calculation of the liquid level height after the previous suction operation. Therefore, if the liquid level in the container is normally detected by the liquid level sensor 8, H ₁ ≈H _0. It should be. Threshold value for determining whether a H ₁ ≒ H ₀ by the difference ΔH (= H ₁ -H ₀₎ is the first threshold. The first threshold value is set in consideration of an intake amount error due to the intake accuracy of the pump 4.

The case where the liquid level in the container is not normally detected by the liquid level sensor 8 is a case where bubbles are generated on the liquid level and the liquid level sensor 8 detects the liquid level when the tip of the probe 2 comes into contact with the bubbles. It is. In that case, H ₁ > H ₀ is always satisfied, and ΔH exceeds the first threshold value. When the liquid level is normally detected by the liquid level sensor 8, the difference ΔH (= H ₁ −H ₀ ) can be a positive value or a negative value. Although the value may be set as -α to + α, H ₁ > H ₀ is always set when the liquid level sensor 8 detects a bubble, so the first threshold value is set only on the plus side. It only has to be done. In this embodiment, the first threshold value is set only on the plus side. When the difference ΔH calculated by the difference calculating means 18 exceeds the first threshold value, it is suspected that bubbles are generated on the liquid surface in the container.

  However, if ΔH exceeds the first threshold, the container has been replaced with a new one (filled with liquid) after the previous collection of the liquid, or the liquid in the container has been replenished. It may be the case. Therefore, when ΔH exceeds the first threshold value, a threshold value for determining whether the cause is due to bubbles generated on the liquid surface or due to an increase in the liquid amount. Is the second threshold. The second threshold value considers the maximum value of the size of bubbles that can be generated on the liquid level in the container. Therefore, when ΔH exceeds the second threshold value, it can be determined that the container has been replaced with a new one or the liquid has been replenished.

When the liquid level height detecting means 16 detects the liquid level height H ₁ in the container, the bubble detecting means 20 first compares the H ₁ with the theoretical value H _0, and the difference ΔH is the first difference ΔH. It is configured to determine as follows depending on whether or not ΔH exceeds the second threshold and whether or not ΔH exceeds the second threshold.
_{ΔH ≦ 0 (H 1 ≦ H} 0) ·· normal first threshold <[Delta] H ≦ second second threshold bubble is generated in the threshold ... liquid level <[Delta] H ... inhalation The target container has been replaced with a new one

  The warning display unit 22 is configured to output a message to the information display unit 30 when the bubble detection unit 20 detects that bubbles are generated on the liquid surface. The fact can be displayed on the information display unit 30 so that the operator can recognize it.

  Next, the liquid sampling operation of this embodiment will be described with reference to the flowchart of FIG. 3 together with FIG.

  Examples of the liquid to be inhaled by the liquid sampling apparatus include a plurality of types of reagents installed in the automatic analyzer. There are a plurality of liquids that can be inhaled and each is housed and installed in a separate container. When conditions such as the type and amount of liquid to be collected are specified by the operator, the liquid (container) to be inhaled is specified based on the conditions, and the probe 2 is moved from the position above the container to the liquid level sensor 8. Is lowered until the liquid level is detected (probe lowering operation).

When the liquid level sensor 8 detects the liquid level, the probe 2 is stopped, and the liquid level height H ₁ in the inhalation target container is obtained based on the position of the probe 2 at that time. In the case of the first inhalation operation for the inhalation target container, the initial inhalation value H0 stored in the liquid level height storage unit 24 is used, and the second and subsequent inhalation operations for the inhalation target container are performed. In this case, H ₁ is compared with H ₀ using the theoretical value H ₀ of the liquid level after the previous suction operation stored in the liquid level storage unit 24, and H ₁ ≦ H ₀ . If it is normal, the probe 2 is further lowered by a certain distance, and the liquid suction operation is executed. When the theoretical value H ₀ for the container is not stored in the liquid level storage unit 24, the liquid collecting operation for the container is performed for the first time. A predetermined amount of liquid is inhaled (inhalation operation) and dispensed into a predetermined container (dispensing position) (dispensing operation).

If H ₁ > H ₀ , the difference calculation means 18 calculates the difference ΔH (= H ₁ −H ₀ ), and if ΔH is equal to or less than the first threshold value, it is determined to be normal, and the probe 2 is further fixed. The liquid is sucked down by a distance. When ΔH exceeds the first threshold value, ΔH is compared with the second threshold value, and if it is equal to or less than the second threshold value, it is determined that bubbles are generated on the liquid surface. In that case, after the fact is output to the information display unit 30, the subsequent suction operation and dispensing operation are executed. When this liquid collection device is incorporated in the automatic analyzer, the result of analysis performed using the liquid collected by this inhalation operation is displayed on the container when the information display unit 30 displays the result. You may make it display the warning to the effect of the bubble having generate | occur | produced. Then, the operator can recognize that the reliability of the analysis result is doubtful.

  Further, as another embodiment, when a bubble on the liquid level is detected by the bubble detection means 20, a warning to that effect is displayed, and the subsequent suction operation and dispensing operation are interrupted until the operator confirms it. It may be configured.

  When ΔH exceeds the second threshold value, the container is determined to be a new container, and the subsequent suction operation and dispensing operation are executed. Even when ΔH exceeds the second threshold, the information display unit 30 may display that the container is a new container.

Based on the liquid level height H ₁ detected during the probe lowering operation and the suction amount condition, the theoretical value H ₀ of the liquid level after the current suction operation is calculated. In FIG. 3, H ₀ is calculated after the liquid dispensing operation, but the timing of this calculation may be any timing as long as H ₀ can be calculated.

(Example 2)
Another embodiment of the liquid sampling apparatus will be described with reference to FIG.

  In the liquid sampling apparatus of this embodiment, the function of the arithmetic control device 10a that controls the operation of the pump 4 and the probe drive mechanism 6 is the same as that of the arithmetic control device 10 of the first embodiment described with reference to FIGS. This is different from the function, and other configurations are the same as those of the first embodiment.

  The arithmetic control device 10a of this embodiment includes a threshold selection means 19 and a liquid information storage unit 28 in addition to the functions of the arithmetic control device 10 of the first embodiment. Furthermore, the first threshold value holding unit 25 and the second threshold value holding unit 26 in the first embodiment hold a single value as the first threshold value and the second threshold value, respectively. The first threshold value holding unit 25a and the second threshold value holding unit 26a in this embodiment hold a plurality of values as the first threshold value and the second threshold value, respectively.

  The size of bubbles generated on the liquid surface of a container to be inhaled may vary depending on the type of liquid and the size and shape of the container. Further, the range of allowable error in the liquid level after inhalation due to the inhalation accuracy of the pump 4 varies depending on the size and shape of the container. For this reason, the first threshold value holding unit 25a holds the first threshold value corresponding to the size and shape of the container that stores the liquid to be inhaled. The second threshold value holding unit 26a holds, as the second threshold value, a value corresponding to the type of liquid to be inhaled or a value corresponding to the size or shape of the container. The type of liquid and the size or shape of the container are registered in advance on the apparatus side as liquid information, and are registered in the liquid information holding unit 28.

  The threshold selection means 19 reads the information on the inhalation target liquid specified based on the condition designated by the operator from the liquid information holding unit 28, and the first threshold value selection means 19 according to the size or shape of the container that stores the liquid. The threshold value is selected from the first threshold value holding unit 25a, and the second threshold value is selected from the second threshold value holding unit 26a according to the type of liquid, the size or shape of the container. It is configured. The bubble detection means 20 detects bubbles generated on the liquid surface using the first threshold value and the second threshold value selected by the threshold selection means 19.

  The operation of this embodiment will be described with reference to the flowchart of FIG. 5 together with FIG.

  When conditions such as the type and amount of liquid to be collected are specified by the operator, the liquid (container) to be inhaled is specified based on the conditions, and information on the liquid is read from the liquid information holding unit 28. The first threshold value and the second threshold value are selected based on the type of liquid read out, the size or shape of the container. The first threshold value and the second threshold value selected here are used to detect bubbles in the inhalation target container. Since the subsequent flow from the probe lowering operation to the dispensing operation is the same as that in the first embodiment, detailed description thereof is omitted here.

(Example 3)
Next, an embodiment of an automatic analyzer to which the liquid sampling apparatus is applied will be described with reference to FIGS. The liquid sampling device applied in this embodiment may be any one of the first embodiment and the second embodiment.

  The automatic analyzer 101 includes two automatic analyzers 102a and 102b and an inter-device transport device 112. The automatic analyzers 102a and 102b are arranged side by side in the X direction, which is one direction in the horizontal plane, and the transport mechanisms 106a and 106b of the automatic analyzers 102a and 102b are connected by the inter-device transport device 112. . In this automatic analyzer 101, the sample that has been sampled in the front-stage automatic analyzer 102a is introduced into the rear-stage automatic analyzer 102b via the inter-device transport apparatus 112, and the latter-stage automatic analyzer 102b also receives the sample. Sample sampling and analysis are performed.

  The automatic analyzer 102a on the front stage side includes an analysis operation unit 104a, a transport mechanism 106a, and a rack introduction mechanism 118a. The transport mechanism 106a includes a belt conveyor 107a that transports the sample rack 120 holding the sample container to one side in the X direction (left side in FIGS. 6 and 7). The periphery of the belt conveyor 107a is covered with a cover. A sample rack arrangement unit 108a is provided on the start end side (right side in FIGS. 6 and 7) of the transport mechanism 106a, and a sample rack collection unit 110a is provided on the end side (left side in FIG. 6). The covers of the sample rack arranging unit 108a and the sample rack collecting unit 110a can be opened and closed. The user opens the cover of the sample rack arranging unit 108a and arranges the sample rack on the belt conveyor 107a, or covers the sample rack collecting unit 110a. The sample rack that has been sampled can be taken out by opening.

  The rack introduction mechanism 118a moves in the Y direction orthogonal to the X direction in the horizontal plane, holds the sample rack 120 on the belt conveyor 107a and introduces it to the analysis operation unit 104a side, or removes the sample rack 120 after sampling. It is arranged on the conveyor 107a.

  The analysis operation unit 104a includes a reagent storage unit 122a, a sample storage unit 123a, a measurement unit 124a, a sampling arm 125a, and reagent arms 127a and 129a. In the reagent storage unit 122a, a plurality of reagent containers 121a storing various reagents are installed on the same circumference. The sample storage unit 123a can store a plurality of sample racks 120, and the sample rack 120 introduced by the rack introduction mechanism 118a is stored in the sample storage unit 123a. The measurement unit 124a is provided with a plurality of measurement ports (not shown), and optically measures the reactions in the reaction vessels arranged at these measurement ports. The reagent storage unit 122a, the sample storage unit 123a, and the measurement unit 124a are each a turntable that rotates in a horizontal plane, and the reagent container, the sample container, and the measurement port can be moved to arbitrary positions on the circumference thereof. .

  The sampling arm 125a is disposed so as to extend in the horizontal direction between the sample storage unit 123a and the measurement unit 124a. A probe 126a for collecting a sample is fixed to the distal end portion of the sampling arm 125a with the distal end thereof being vertically downward. The base end portion of the sampling arm 125a is supported by a vertically arranged shaft, and can rotate about the shaft and move up and down along the shaft. Accordingly, the probe 126a moves so as to draw a circular orbit between the position on the sample container 123a and the position on the measurement unit 124a, and descends from the position on the sample container or the position on the reaction container. Can be inhaled or the sample can be dispensed into a reaction container. The sampling arm 125a and the probe 126a constitute a sample collection mechanism 140a (see FIG. 12).

  The reagent arms 127a and 129a are arranged so as to extend in the horizontal direction between the reagent storage unit 122a and the measurement unit 124a, respectively. A probe 128a for collecting the reagent is fixed to the tip of the reagent arm 127a, and a probe 130a for collecting the reagent is fixed to the tip of the reagent arm 128a with the tip vertically downward. The base end portions of the reagent arms 127a and 129a are supported by shafts arranged vertically, and can rotate up and down along the shaft while rotating about the shaft. As a result, the probes 127a and 129a move in a circular orbit between a position on the reagent storage unit 122a and a position on the measurement unit 124a, and descend from the position on the reagent container to remove the reagent. The reagent can be dispensed into the reaction vessel by inhalation. The reagent arm 127a and the probe 128a, and the reagent arm 129a and the probe 130a constitute independent reagent dispensing mechanisms 142a (see FIG. 12).

  In this embodiment, the reagent dispensing mechanism 142a is configured by the two reagent arms 127a and 129a. However, only one reagent arm may be provided. By providing the two reagent arms 127a and 129a, it is possible to cope with an analysis item using two or more reagents.

  The reagent dispensing mechanism 142a (see FIG. 12) is applied with the liquid sampling apparatus according to the first embodiment or the second embodiment. That is, the reagent arms 127a and 129a correspond to the arm 34 in FIG. 2, and the probes 128a and 130a correspond to the probe 2 in FIG. Although not shown in FIG. 7, a liquid level sensor 144a (see FIG. 12) that detects that the tips of the probe 128a and the probe 130a are in contact with the liquid level is a reagent dispensing mechanism 142a (see FIG. 12). )), And the detection signal of the liquid level sensor 144a is taken into the arithmetic and control unit 134 (see FIG. 12) that manages the entire automatic analyzer.

  The rear-stage automatic analyzer 102b has the same configuration as the front-stage automatic analyzer 102a. The start end of the belt conveyor 107b provided in the transport mechanism 106b of the automatic analyzer 102b and the end of the front belt conveyor 107a are connected by an inter-device transport device 112.

  The inter-device transport device 112 includes a transport mechanism that holds the sample rack 120 at the end of the front belt conveyor 107a and is disposed at the start end of the rear belt conveyor 107b, and an openable / closable shielding cover 114 that covers the transport mechanism. I have. The transport mechanism will be described later.

  An example of the transport mechanism of the inter-device transport apparatus 112 will be described with reference to FIGS.

  The transport mechanism 1100 includes a table 1102 having a horizontal plane. The table 1102 is supported by a base 1118. The horizontal surface of the table 1102 is set to substantially the same height as the conveying surfaces of the belt conveyors 107a and 107b arranged at both ends. A position in the vicinity of one end (right side in the figure) of the table 1102 in the X direction is a transport start position 1103a that starts transporting by holding a sample rack that is a transport target. It arrange | positions so that the terminal end of the belt conveyor 107a may come. The position in the vicinity of the end of the table 1102 on the other side (left side in the figure) in the X direction is the transport completion position 1103b of the sample rack, and the transport conveyor position 1073b is at the start of the belt conveyor 107b on the rear stage side. Has been placed.

  An arm member 1104 and an arm member 1106 extending in the X direction are disposed opposite to both side edges on the table 1102. The arm member 1104 and the arm member 1106 are driven in the X direction and the Y direction at the side edge of the table 1102. The arm member 1104 and the arm member 1106 move simultaneously in the same direction in the X direction and move in a symmetrical direction around the table 1102 in the Y direction. Although not shown in the figure, the arm member 1104 and a mechanism such as a motor for driving the arm member 1106 are housed inside the base 1118.

  The arm member 1104 includes a protrusion 1104a at the end of the transportation start position 1103a and a protrusion 1104b at the end of the transportation completion position 1103b. The protrusion 1104a and the protrusion 1104b are fitted into a recess (not shown) provided on the side surface of the sample rack on the arm member 1104 side and engaged with the sample rack. The movement of the arm member 1104 in the Y direction is performed between a position where the projections 1104a and 1104b are fitted in the recess of the sample rack and a position where the arm member 1104 does not contact the sample rack itself.

  The arm member 1106 includes a protrusion 1106a at the end of the transportation start position 1103a and a protrusion 1106b at the transportation completion position 1103b. The protrusion 1106a and the protrusion 1106b are engaged with the rear rear surface of the sample rack. The movement of the arm member 1106 in the Y direction is performed between a position where the protrusions 1106a and 1106b engage with the back surface of the sample rack and a position where the protrusions 1106a and 1106b do not contact the sample rack.

  The arm members 1104 and 1106 form a handler that holds the sample rack and slides the table 1102 from the transport start position 1103a to the transport completion position 1103b. This handler is provided with holding portions at two locations on the transportation start position 1103a side and the transportation completion position 1103b side. The holding portion on the transport start position 1103a side is constituted by a projection 1104a of the arm member 1104 and the projection 1106a of the arm member 1106, and the holding portion on the transport completion position 1103b side is constituted by a projection 1104b of the arm member 1104 and a projection 1106b of the arm member 1106. Is done.

  Hereinafter, the arm member 1104 and the arm member 1106 are collectively referred to as “handlers 1104 and 1106”, the holding portions on the transportation start position 1103a side of the handlers 1104 and 1106 are referred to as “first holding portions 1104a and 1106a”, and the transportation completion position 1103b side. The holding units are referred to as “second holding units 1104b and 1106b”.

  The first holding portions 1104a and 1106a insert the projection 1104a into the concave portion on one side surface of the sample rack and insert the sample 1104a by sandwiching the sample rack from both sides at the ends of the arm members 1104 and 1106 on the transport start position 1103a side. The rear rear side opposite to the rack is supported by the protrusion 1106a. The second holding portions 1104b and 1106b sandwich the sample rack from both sides at the ends of the arm members 1104 and 1106 on the transport completion position 1103b side, thereby fitting the protrusion 1104b into the concave portion on one side of the sample rack and the sample rack. The opposite rear back surface is supported by the protrusion 1106b. The handlers 1104 and 1106 move in the X direction while holding the sample rack, and slide the sample rack on the table 1102 for transport. A guide rail 1108 that is fitted in a groove provided on a side surface of the sample rack that slides on the table 1102 and prevents the sample rack from falling is provided on the side edge of the table 1102 on the arm member 1106 side.

  A start sensor 1110 for detecting the arrival of the sample rack at the transport start position 1103a is provided on the side of the transport start position 1103a. An end sensor 1112 for detecting the arrival of the sample rack at the transportation completion position 1103b is provided on the side of the transportation completion position 1103b. Further, a stopper 1114 is provided in the vicinity of the transport start position 1103a for temporarily stopping the sample rack that has been transported to the transport start position 1103a by the preceding belt conveyor 107a at the transport start position 1103a. .

  A circuit board 1116 is provided on the side of the base 1118. The circuit board 1116 constitutes a control unit (hereinafter also referred to as a control unit 1116) that controls the operations of the handlers 1104 and 1106. The start sensor 1110 and the end sensor 1112 are connected to the circuit board 1116 via wiring. Signals from the start sensor 1110 and the end sensor 1112 are taken into the circuit board 1116 and are used to start the sample rack transport operation by the handlers 1104 and 1106 and to determine whether there is a sample rack transport error.

  10 and 12, illustration of wiring and modules mounted on the circuit board 1116 is omitted. In FIG. 11, some of the modules mounted on the circuit board 1116 are illustrated, but illustration of wiring is omitted.

  Next, a control system of the entire automatic analyzer 101 will be described with reference to FIG.

  The first automatic analyzer 102a is provided with a controller 132a that controls the operation of the analysis operation unit 104a, the transport mechanism 106a, and the rack introduction mechanism 118a, and the second automatic analyzer 102b includes the analysis operation unit 104b, the transport mechanism 106b, and A controller 132b that controls the operation of the rack introduction mechanism 118b is provided. The inter-device transport apparatus 112 is provided with a control unit 1116 that controls the operation of the transport mechanism 1100.

  The control units 132a, 132b, and 1116 are each connected to the arithmetic control device 134. Measurement data obtained by the analysis operation unit 104a of the first automatic analyzer 102a and measurement data obtained by the analysis operation unit 104b of the second automatic analysis device 102b are taken into the arithmetic control device 134 via the control unit 132a, The arithmetic and control unit 134 identifies and quantifies components in the specimen.

  As described above, the analysis operation unit 104a of the first automatic analyzer 102a includes the sample collection mechanism 140a and the reagent dispensing mechanism 142a. The reagent dispensing mechanism 142a applies the liquid sampling mechanism of Example 1 or Example 2, and the reagent dispensing mechanism 142a detects that the tips of the probes 128a and 130a are in contact with the liquid surface. A liquid level sensor 144a is provided. Similarly, the analysis operation unit 104b of the second automatic analyzer 102b includes a sample collection mechanism 140b and a reagent dispensing mechanism 142b, and the tips of the probes 128b and 130b are in contact with the liquid level in the reagent dispensing mechanism 142b. A liquid level sensor 144b is provided for detecting the above. The detection signal of the liquid level sensor 144a is taken into the arithmetic control device 134 via the control unit 132a, and the detection signal of the liquid level sensor 144b is taken into the arithmetic control device 134 via the control unit 132b.

  The arithmetic control device 134 realizes the arithmetic control device 10 of the first embodiment or the arithmetic control device 10a of the second embodiment, and the information display unit 138 realizes the information display unit 30 of the first or second embodiment. Is. The arithmetic and control unit 134 detects the bubbles in the liquid level in the reagent container using the liquid level bubble detection function described in the first or second embodiment, and bubbles are formed on the liquid level of the reagent when the reagent is inhaled. Is detected, the fact is displayed on the information display unit 138. When an analysis is performed using a reagent in which bubbles are detected, a warning that bubbles may exist on the liquid surface of the reagent when the analysis result is displayed on the information display unit 138. To do.

2, 126a, 126b, 128a, 128b, 130a, 130b Probe 4 Pump 5 Probe drive mechanism 6 Vertical movement drive unit 7 Rotation drive unit 8, 144a, 144b Liquid level sensor 10, 10a, 134 Arithmetic control unit 12 Probe operation control means DESCRIPTION OF SYMBOLS 14 Liquid level height detection means 16 Inhaled liquid level height calculation means 18 Difference calculation means 19 Threshold selection means 20 Bubble detection means 22 Warning display means 24 Liquid level height memory | storage part 25 1st threshold value holding part 26 , 26a Second threshold value holding unit 28 Liquid information holding unit 30, 138 Information display unit 104a, 104b Analysis operation unit 106a, 106b Transport mechanism 112 Inter-device transport device 118a, 118b Rack introduction mechanism 120 Sample rack 121a, 121b Reagent container 122a, 122b Reagent storage unit 123a, 123b Sample collection Parts 124a, 124b measuring unit 125a, 125b sampling arm 132a, 132b, 1116 control unit 136 information input unit 1100 transport mechanism

Claims (11)

A probe inserted into the container containing the liquid from above and sucking the liquid in the container;
A probe driving mechanism for driving the probe at least in the vertical direction;
A pump for sucking and discharging liquid through the probe;
A liquid level sensor for detecting that the tip of the probe is in contact with the liquid level;
As suction operation for sucking amount the liquid has been previously set in the probe lowering operation and the container is advanced into the vessel by lowering the probe from the position on the container containing the liquid suction target is performed Probe operation control means for controlling the probe driving mechanism and the pump;
Based on the detection signal of the liquid level sensor, the level of the probe before the suction operation is detected by detecting the position of the probe when the probe tip contacts the liquid level during the probe lowering operation. A liquid level detecting means configured as follows:
Based on the intake amount when the detected the suction operation before the liquid level height and the suction operation by the liquid level height detection means, configured to calculate the theoretical value of the liquid level height after the suction operation Liquid level height calculating means after inhalation,
A liquid level storage unit for storing a theoretical value of the liquid level calculated by the liquid level calculating unit after inhalation;
It is set as the maximum value of the error that is allowed as the difference between the theoretical value of the liquid level after the suction operation calculated by the post-suction liquid level calculation means and the actual liquid level after the suction operation. A first threshold value holding unit for holding the first threshold value;
A second threshold value holding unit for holding a second threshold value set larger than the first threshold value;
The liquid level detected by the liquid level detecting means when performing the second and subsequent probe lowering operations on the same inhalation target container, and stored in the liquid level storage unit A difference calculating means configured to calculate a difference from the theoretical value of the liquid level after the inhalation operation for the container;
The difference value calculated by the difference calculating means is compared with the first threshold value and the second threshold value, the difference value exceeds the first threshold value, and the second threshold value liquid collecting device and a bubble detector arranged to detect the presence of bubbles when it is below the threshold. The liquid level storage unit stores an initial value of the liquid level of the liquid stored in the container,
The difference calculation means is stored in the liquid level height detected by the liquid level detection means and the liquid level storage unit when the first probe lowering operation is performed on the container to be inhaled. The liquid sampling apparatus according to claim 1, wherein a difference from an initial value of the liquid level of the liquid in the container is calculated as the difference value used by the bubble detection means for detecting bubbles.   The liquid sampling apparatus according to claim 1 or 2, wherein the second threshold value is set based on a maximum value of the size of bubbles that can be generated on a liquid surface in the container. A plurality of containers containing different types of liquids to be inhaled by the probe are provided, and the second threshold is individually set for each type of inhaled liquid,
Threshold value selecting means for selecting the second threshold value according to the type of liquid to be inhaled;
The liquid sampling apparatus according to claim 3, wherein the bubble detection unit is configured to detect the presence of a bubble using the second threshold value selected by the threshold selection unit. A plurality of containers containing liquids to be inhaled by the probe are provided, and the first threshold value is individually set for each size or shape of the container containing the liquid to be inhaled,
Further comprising threshold selection means for selecting the first threshold according to the size or shape of the container containing the liquid to be inhaled;
The liquid sampling apparatus according to claim 3, wherein the bubble detection unit is configured to detect the presence of a bubble using the first threshold value selected by the threshold selection unit. A plurality of containers containing liquids to be inhaled by the probe are provided, and the second threshold value is individually set for each size or shape of the container containing the liquid to be inhaled,
Further comprising threshold selection means for selecting the second threshold according to the size or shape of the container containing the liquid to be inhaled;
The liquid sampling apparatus according to claim 3, wherein the bubble detection unit is configured to detect the presence of a bubble using the second threshold value selected by the threshold selection unit. It said bubble sensing means, to sense the vessel containing the inhalation subject liquid that is a new container when the difference value calculated by said difference calculating means exceeds said second threshold value The liquid collection device according to any one of claims 1 to 6, wherein the liquid collection device is configured as follows. When the bubble detection means detects the presence of bubbles, the apparatus further comprises a warning display means configured to output that the bubble detection means has detected the presence of bubbles in a manner that can be recognized by an operator. The liquid collection device according to any one of claims 1 to 7. The probe operation control unit, the liquid level detection unit, the post-inhalation liquid level calculation unit, the liquid level storage unit, the threshold holding unit, the difference calculation unit, and the bubble detection unit. An arithmetic control unit,
An information display unit that is connected to the arithmetic control device and displays information of the arithmetic control device;
Said warning display means, according to claim 8, wherein the bubble detection means is configured such that the bubble detection means upon detection of the presence of foam displaying the detection of the presence of bubbles in the information display unit Liquid sampling device. A sample collection mechanism for collecting a sample from a sample container containing the sample and dispensing the sample into a reaction container for reacting the sample;
A reagent dispensing mechanism configured by the liquid sampling device according to any one of claims 1 to 9, wherein the reagent is sucked from the reagent container containing the reagent and dispensed into the reaction container;
An automatic analyzer comprising: a measurement unit that measures the inside of a reaction container containing a sample and a reagent. A plurality of analyzers each provided with the sample collection mechanism, the reagent dispensing mechanism, and the measurement unit are provided,
Each of the analyzers includes a belt conveyor that conveys a sample rack holding a plurality of sample containers in one direction, and the end of one belt conveyor and the other belt conveyor of the analyzers arranged adjacent to each other. The transport mechanism is arranged so that the start ends of the belt conveyors face each other, and the sample rack that has reached the end of the one belt conveyor is held between the belt conveyors and transported to the start end of the other belt conveyor The automatic analyzer according to claim 10 , wherein the automatic analyzer is connected by a device-to-device transport device.

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