Automated analyzer and reaction vessel

Abstract

When a reaction liquid in a reaction vessel is irradiated with light to measure a light quantity such as transmitted light, optical axis deviation occurs due to vibration-induced rattling of the reaction vessel, and measurement precision decreases. A torsion coil spring 302 for biasing a reaction vessel 112 is provided in a heat block 200 on which the reaction vessel is mounted and which has a plurality of reaction vessel installation holes 201, the reaction vessel 112 is provided with a projection 501 in a portion of a side surface thereof, and when the reaction vessel is inserted in a hole, an arm part of the torsion coil spring 302 operates so as to retract along the projection, and biases the projection vertically downward and in the horizontal direction when the reaction vessel is settled in the hole, and so as to press the reaction vessel 112 against the wall of the hole 201.

Description

[Technical field]

[0001] The present invention relates to an automatic analyzer and a reaction vessel therefor. [Background technology]

[0002] Automated analyzers that analyze components in samples such as blood and urine and test for the presence or absence of microorganisms include biochemical automated analyzers that perform biochemical tests and immunological automated analyzers that perform immunological tests. For example, in biochemical automated analyzers, a reagent that reacts with the target substance is added to the sample to cause color development through a chemical reaction, and the color development is measured as a change in absorbance over time using absorptiometry to determine the rate of change in absorbance, which is then substituted into a calibration curve to determine the concentration of the target component in a colorimetric analysis. In addition, in immunological automated analyzers, a specific target substance contained in the sample is labeled by an antigen-antibody reaction that reacts specifically with it, the amount of the labeled substance is quantified, and this is substituted into a calibration curve to determine the concentration of the target component in an immunological analysis. These reactions have an appropriate temperature at which the reaction proceeds most efficiently. Generally, in specimen tests targeting substances present in the human body, the reaction efficiency is good at 37°C, which is close to human body temperature. For this reason, in many automated analyzers, the chemical reaction of the target substance is performed using a heat block or the like that is controlled to around 37°C. (See Patent Document 1.) Also, a hybrid automatic analyzer is known that combines the analytical methods of a biochemical automatic analyzer and an immunological automatic analyzer. Reaction vessels to be used in this hybrid automatic analyzer are also being studied. (See Patent Document 2.) [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2018 / 147029 [Patent Document 2] WO2020 / 066165 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned Patent Document 1 describes an invention that realizes an improvement in the temperature uniformity of the reaction liquid in multiple reaction vessels held by a heat block by a simple method, and improves the stability of the measurement accuracy while suppressing the increase in size of the device itself. Also, the above-mentioned Patent Document 2 describes a shape of a reaction vessel that can measure the amount of light from the reaction liquid without reducing the function of maintaining the reaction vessel at a predetermined temperature.

[0005] On the other hand, no mention is made of an appropriate holding mechanism for the reaction vessel when it is placed in the heat block.In a combined automatic analyzer that combines the analytical methods of a biochemical automatic analyzer and an immunological automatic analyzer, a cylindrical shape is adopted for the reaction vessel so that it can be handled by the same mechanism as the chip and to improve the robustness of position adjustment during insertion.

[0006] In addition, the reaction solution in a disposable reaction vessel held by a heat block is irradiated with light to measure the amount of transmitted light and scattered light. During this light measurement, the heat block rotates, and vibrations cause the reaction vessel to wobble, resulting in misalignment of the optical axis and reduced measurement accuracy.

[0007] Therefore, an object of the present invention is to provide an automatic analyzer and a reaction vessel having a holding mechanism that can suppress rattling of the reaction vessel without reducing the function of maintaining the reaction vessel at a predetermined temperature. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides an automatic analyzer for analyzing a mixture of a sample and a reagent, the automatic analyzer comprising a heat block having a hole into which a reaction container is inserted and a biasing member for biasing the reaction container, the reaction container having a first protrusion on a part of its side, the biasing member operating to retract to the outside of the reaction container along the first protrusion when the reaction container is lowered vertically from above to below when inserted into the hole, and configured to bias the first protrusion vertically downward when the reaction container is placed in the hole.

[0009] In addition, in order to solve the above problems, the present invention provides a reaction vessel for containing a mixture of a sample and a reagent, the reaction vessel having a configuration including a first protrusion on a part of a side surface for biasing the reaction vessel with a spring, and a second protrusion on a part of the side surface, the second protrusion being provided at a position that is off the vertical line with the first protrusion, for guiding a light-transmitting surface to be vertical. Effect of the Invention

[0010] According to the present invention, it is possible to provide an automatic analyzer having a holding mechanism capable of suppressing rattling of a reaction vessel without compromising the function of maintaining the reaction vessel at a predetermined temperature. Problems, configurations, and effects other than those described above will become apparent from the description of the following embodiments. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of the overall configuration of an automatic analyzer according to a first embodiment. [Diagram 2] FIG. 2 is a diagram showing an optical system in a heat block in which a reaction vessel according to the first embodiment is placed. [Diagram 3] FIG. 2 is a schematic diagram of a heat block according to the first embodiment. [Figure 4] 3A and 3B are a perspective view and a cross-sectional view of a torsion coil spring installation position according to the first embodiment. [Diagram 5] FIG. 1 is a schematic diagram of a reaction vessel according to a first embodiment. [Figure 6] FIG. 4 is a diagram showing the movement of a torsion coil spring when a reaction vessel is inserted according to the first embodiment. [Figure 7] FIG. 5 is a schematic diagram of a reaction vessel according to Example 2. [Figure 8] FIG. 11 is a schematic diagram of a reaction vessel according to Example 3. [Figure 9] FIG. 11 is a schematic view of a torsion coil spring stopper according to a third embodiment. [Figure 10] FIG. 11 is a schematic view of a torsion coil spring stopper according to a fourth embodiment. [Figure 11] FIG. 13 is a schematic view of a torsion coil spring stopper according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, preferred embodiments of the automatic analyzer according to the present invention will be described with reference to the accompanying drawings. In the following description and the accompanying drawings, components having the same functional configuration are designated by the same reference numerals to avoid redundant description.

[0013] An example of the overall configuration of an automatic analyzer 100 for biochemical testing to which various embodiments are applied will be described with reference to Fig. 1. The automatic analyzer 100 has a sample transport path 103, a reagent disk 104, a transfer unit 108, an incubator 105, a spectrophotometer 113, and a control unit 109. Each unit will be described below. As shown in the lower right of Fig. 1, the left-right direction is the X-axis, the up-down direction is the Y-axis, and the vertical direction perpendicular to the paper surface is the Z-axis.

[0014] The sample transport path 103 transports a sample rack 102 on which a plurality of sample containers 101 containing samples are mounted to a position accessible by the sample dispensing unit 106. The samples contained in the sample containers 101 are dispensed by the sample dispensing unit 106 into reaction containers 112 held in an incubator 105.

[0015] The transfer unit 108 grasps and transfers the reaction vessels 112 and dispensing tips, which are consumables placed on the tray, with a gripper. The reaction vessels 112 transferred from the tray to the incubator 105 by the transfer unit 108 are used to contain a mixture of a specimen and a reagent, and are replaced for each analysis. That is, the transfer unit 108 transfers unused reaction vessels 112 to the incubator 105.

[0016] The reagent disk 104 stores a plurality of reagent containers 110 that contain reagents. To reduce deterioration of the reagents, the inside of the reagent disk 104 is kept at a temperature lower than room temperature. The reagent disk 104 is covered by a reagent disk cover 111. Note that in FIG. 1, only a portion of the reagent disk cover 111 is shown to show an example of the arrangement of the reagent containers 110. The reagent contained in the reagent containers 110 is dispensed by a reagent dispensing unit 107 into the reaction containers 112 into which the sample has been dispensed.

[0017] The incubator 105 holds a plurality of reaction vessels 112 that contain a mixture of a specimen and a reagent, and is kept at a predetermined temperature, for example, around 37° C., to cause the mixture to react. The mixture is reacted for a predetermined time while the reaction vessels 112 are held in the incubator 105 that is kept at the predetermined temperature, and becomes a reaction liquid to be used in analysis. The incubator 105 is sometimes called a heat block.

[0018] The spectrophotometer 113 measures the absorbance of the reaction liquid contained in the reaction vessel 112 in order to analyze a specific component contained in the reaction liquid. The spectrophotometer 113 is disposed adjacent to the incubator 105, and has a light source, a spectroscopic element, and a photodetector. A halogen lamp is used as the light source, a diffraction grating is used as the spectroscopic element, and a photomultiplier tube or a photodiode is used as the photodetector. The light emitted from the light source is split into measurement wavelengths by the spectroscopic element and then irradiated onto the reaction liquid contained in the reaction vessel 112, and the intensity of the light that has passed through the reaction liquid is detected by the photodetector. The absorbance A for a certain wavelength λ is λ is the intensity of light irradiated to the reaction solution, I λ0 and the intensity of light transmitted through the reaction solution I λ It is calculated by the following formula using

[0019] A λ =log(I λ0 / I λ ) … (Equation 1) and absorbance A λ is proportional to the optical path length L and the concentration C of a specific component contained in the reaction solution, so the following equation holds:

[0020] A λ =ε·L·C … (Equation 2)Here, ε is a proportionality constant determined for each type of specific component. That is, the intensity of the transmitted light from the reaction solution I λ The absorbance A calculated from λ The concentration C of a specific component is calculated from the value of and the optical path length L.

[0021] The control unit 109 is a device, such as a computer, that controls the operation of each unit, receives input of data necessary for analysis, and displays and stores the results of the analysis.

[0022] 2 is a cross-sectional view of a state in which a reaction vessel 112 is placed in a heat block 200, which is an incubator. The heat block 200 has a hole 201 for holding the reaction vessel 112, and serves to raise and maintain the temperature of the reaction liquid in the reaction vessel 112 to a predetermined temperature, and has slits 202 and 203 in the optical path to allow light to pass through.

[0023] The optical system is composed of a light source 204, a condenser lens 205, a concave diffraction grating 206, and a photodetector 207. The light emitted from the light source 204 is condensed by the condenser lens 205, the irradiation range is limited by the irradiation slit 202, and the light enters the reaction vessel 112, from which light of an amount according to the absorbance of the reaction solution 208 in the reaction vessel 112 is emitted, the receiving range is limited by the light receiving slit 203, the light is dispersed by the concave diffraction grating 206, and the light is received by the photodetector 207. The amount of light of each wavelength received here is converted into an electric signal, whereby the absorbance is measured. EXAMPLES

[0024] Example 1 is an automatic analyzer, in which a heat block having a plurality of holes in which reaction vessels are mounted is provided with a torsion coil spring for biasing the reaction vessel, and the torsion coil spring is attached near the holes in the heat block and has an arm for directly biasing the reaction vessel and a coil for providing a restoring force to the arm. The reaction vessel into which a reaction liquid in which a reagent and a sample are mixed is injected has a first protrusion on a part of its side, and when the reaction vessel is inserted into the hole, the arm of the torsion coil spring operates to retract along the first protrusion, and when the reaction vessel is fitted into the hole, the first protrusion is biased vertically downward and horizontally, and so as to press the reaction vessel against the wall of the hole.

[0025] 3 is a diagram showing an example of the configuration of the heat block 200 of the automatic analyzer of Example 1. A hollow circular plate 301 rotatably supported around the central axis of the heat block 200 has holes 201 for storing a plurality of reaction vessels 112, and a torsion coil spring 302 for biasing the reaction vessels is provided near the holes. The torsion coil spring 302 is fixed to the heat block 200 by engaging with a resin part 303. The installation position of the torsion coil spring 302 is preferably inside the installation hole 201 because if the torsion coil spring 302 is provided on the outer periphery side of the installation hole 201, the distance between the reaction vessels 112 and the heater 304, which is a temperature control mechanism provided on the outer periphery of the hollow circular plate 301, is increased, which impairs the responsiveness of the temperature control.

[0026] FIG. 4 is a cross-sectional view showing a method of fixing the torsion coil spring 302. (a) and (b) of the same figure show a perspective view of the installation position of the torsion coil spring in the resin part, and a cross-sectional view when the torsion coil spring is installed on the heat block. It is desirable to select a torsion coil spring 302 whose free height (height when uncompressed) is higher than the depth h of the hole provided in the heat block, and to design the torsion coil spring 302 so that the height of the arm of the torsion coil spring 302 is restored to a fixed position by compressing the torsion coil spring 302 when installed, so that the force required for inserting the reaction vessel is constant. The resin part 303 is provided with a groove 402 that engages with the arm 401 of the torsion coil spring as a rotation stopper provided on the torsion coil spring, and functions to restore the arm 403 on the side that biases the reaction vessel to its original position. Note that the resin part 303 does not have to be made of resin, and the groove as a rotation stopper may be provided on the heat block side.

[0027] 5 shows the appearance and cross section of the reaction vessel of this embodiment. The reaction vessel 112 is made of a plastic material with sufficient transmittance for the wavelength of light required for analysis, and is basically cylindrical so that both the dispensing tip and the reaction vessel can be transported by the same transport mechanism, with a protrusion 501 on the side of the cylindrical part for biasing by a spring. The protrusion 501 of the reaction vessel 112 is mountain-shaped, and may be called the first protrusion.

[0028] That is, the shape of the protrusion is desirably a mountain shape that the torsion coil spring can easily overcome, taking into consideration the insertion and removal of the reaction vessel 112, and the protrusion 501 for biasing is positioned above two opposing parallel flat surfaces 502 provided near the bottom surface of the reaction vessel in order to measure absorbance. Also, the protrusion and the heat block need to be processed so as not to interfere with each other, and since the protrusion is not in contact with the wall surface, it is desirably provided above the liquid level height 503 at the maximum reaction liquid volume (total liquid volume of the specimen and reagent) so as not to affect the heating performance.

[0029] With respect to the heat block and reaction vessel having the above-mentioned configuration, when reaction vessel 112 is lowered vertically from top to bottom to store it in mounting hole 201 of heat block 200 as shown in FIG. 6, torsion coil spring 302 operates to retract to the outside of the reaction vessel along protrusion 501 of the reaction vessel, and as shown on the right side of the same figure, when the reaction vessel is placed in mounting hole 201, it urges the protrusion vertically downward and the cylindrical part of the reaction vessel against the wall of the mounting hole, resulting in reaction vessel 112 being subjected to a pressing force downward and in the circumferentially outward direction.

[0030] This allows for improved accuracy in measuring absorbance without rattling or rotating the reaction vessel 112. In addition, because the reaction vessel is pressed against the wall of the installation hole, heat from the heat block 200 is easily transferred to the reaction vessel 112, which also leads to improved temperature control performance. EXAMPLES

[0031] A variation of the reaction vessel of Example 1 will be described as Example 2. Example 2 is an example of a reaction vessel that contains a mixture of a specimen and a reagent, and is configured to include a first protrusion for biasing the vessel by a spring on a part of the side surface, and a second protrusion for guiding the light-transmitting surface, which is provided on a part of the side surface at a position that is off the line perpendicular to the first protrusion, so as to be vertical.

[0032] 7 is a diagram showing the addition of a protrusion 701 for guiding the light-transmitting surface to be perpendicular to the reaction vessel 112 of this embodiment. That is, a configuration can be considered in which a protrusion 701 for guiding the optical axis to be perpendicular to the flat surface 502 of the reaction vessel 112, i.e., the light-transmitting surface, is added, and a guide groove that engages with the resin part 303 is provided, thereby improving the positioning accuracy of the reaction vessel 112. In this specification, the protrusion 701 may be referred to as a second protrusion.

[0033] The number of protrusions 701 is not limited to two as shown in the figure, but may be one, and may be any position relative to the light-transmitting surface as long as it can be guided so that the optical axis is perpendicular to the light-transmitting surface. Regarding the shape, when there are two protrusions 701, the second protrusion may have a different shape. There may be one protrusion 501 for two guide grooves, and the number of guide grooves and protrusions does not have to be the same. The guide groove may be provided not only in the resin part 303, but also in the heat block or both. EXAMPLES

[0034] 8 and 9 are diagrams showing a reaction vessel 112 according to the third embodiment, which has a recess 901 that engages with a torsion coil spring. The reaction vessel 112 has a flat surface 502, as in the second embodiment. In this embodiment, the reaction vessel 112 does not have a shape that protrudes outward from the cylinder, so there is no need to machine a relief groove for the protrusion in the heat block, and productivity can be expected to improve. Reference numeral 801 denotes a recess in the resin part 303 that engages with the reaction vessel protrusion 701 and that holds the reaction vessel. EXAMPLES

[0035] 10 is a diagram showing a state during insertion in the configuration of Example 4 in which a gap 503 is provided so that the torsion coil spring 302 can also move in the vertical direction as indicated by the arrow. (a), (b), and (c) of the figure show a cross-sectional view in the initial state, a cross-sectional view during insertion, and a three-dimensional cross-sectional view in the initial state.

[0036] When the motion direction of torsion coil spring 302 is limited to the horizontal direction, it is considered that the insertion force becomes large due to friction with the support part of torsion coil spring 302. To solve this problem, in this embodiment, gap 503 is provided to allow torsion coil spring 302 to move in the vertical direction. In this configuration, torsion coil spring 302 moves in the direction of the arrow shown in FIG. 10(b) through gap 503, and until it reaches its vertical motion limit and contacts stopper 305, no frictional force acts between torsion coil spring 302 and the support part, so it can be inserted with a small force. In addition, since the coil part of torsion coil spring 302 is compressed at the same time, the arm part of the spring is always in a nearly horizontal state, allowing stable insertion.

[0037] However, in order to ensure that the torsion coil spring 302 overcomes the protrusion 501 before reaching the final position where the reaction vessel 112 is fixed, it is desirable to position the stopper 305 so that the torsion coil spring 302 is above the protrusion 501 when the reaction vessel 112 is fixed.

[0038] In addition, it is desirable for the spring constant of the coil part of torsion coil spring 302 to be a value that keeps the arms of the spring close to horizontal when inserted. A balance in which the coil part is significantly compressed first may cause the coil part to tilt relative to the guide axis, resulting in stiff movement, so it is desirable to avoid a spring constant balance in which the coil part moves down before the arms. EXAMPLES

[0039] 11 is a diagram showing a state during insertion in the configuration of Example 5 in which the stopper 306 is inclined so that the force of inserting the reaction vessel 112 becomes a force that opens the torsion coil spring 302 in order to reduce the insertion force when the torsion coil spring 302 comes into contact with the stopper. (a), (b), and (c) of the figure show a cross-sectional view in the initial state, a cross-sectional view during insertion, and a three-dimensional cross-sectional view in the initial state.

[0040] When inserting the reaction vessel 112, the stopper 306 is provided with an inclination that induces the torsion coil spring 302 to release not only in the horizontal direction but also in the vertical direction, thereby reducing frictional force and allowing the cuvette to be inserted with less force. In this case, the torsion coil spring 302 moves in the direction of the arrow shown in FIG. 11. It is desirable that the inclination of the stopper 306 is set to the maximum angle within the range in which the torsion coil spring 302 always overcomes the protrusion 501 before finally reaching the position where the reaction vessel 112 is fixed. The configuration of this embodiment can be more effectively achieved by combining it with the fourth embodiment.

[0041] The present invention is not limited to the above-described embodiments and modifications, and further includes various modifications. For example, the above-described embodiments and modifications have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations described. In addition, it is possible to replace a part of the configuration of a certain embodiment or modification with the configuration of another embodiment or modification, and it is also possible to add the configuration of another embodiment or modification to the configuration of a certain embodiment or modification. In addition, it is also possible to add, delete, or replace a part of the configuration of each embodiment or modification with the configuration included in another embodiment or modification. [Explanation of symbols]

[0042] 100: automatic analyzer, 101: sample container, 102: sample rack, 103: sample transport path, 104: reagent disk, 105: incubator, 106: sample dispensing section, 107: reagent dispensing section, 108: transfer section, 109: control section, 110: reagent container, 111: reagent disk cover, 112: reaction container, 113: spectrophotometer, 200... heat block, 201... reaction container installation hole, 202... entrance slit, 203... exit slit , 204...light source, 205...condensing lens, 206...concave diffraction grating, 207...photodetector, 208...reaction liquid, 301...disk, 302...torsion coil spring, 303...resin part, 304...heater, 305, 306...stopper, 401...anti-rotation groove, 501...reaction vessel protrusion, 502...reaction vessel flat part, 503...gap, 701...reaction vessel protrusion, 801...reaction vessel holding recess, 901...recess for engaging with torsion coil spring.

Claims

1. An automatic analyzer for analyzing a mixture of a specimen and a reagent contained in a reaction vessel, comprising: a heat block including a hole into which the reaction vessel is inserted and a biasing member for biasing the reaction vessel; the reaction vessel has a first protrusion on a part of a side surface, the biasing member operates to retreat to the outside of the reaction vessel along the first protrusion when the reaction vessel is lowered vertically from the upper side to the lower side when the reaction vessel is inserted into the hole, and is installed to bias the first protrusion vertically downward when the reaction vessel is accommodated in the hole, and biases the first protrusion horizontally and to press the reaction vessel against the wall of the hole. An automatic analyzer characterized by:

2. (delete)

3. The automatic analyzer according to claim 1, the reaction vessel has a second protrusion at a part of a side surface at a position that is off a line perpendicular to the first protrusion, and the heat block has a groove that fits with the second protrusion. An automatic analyzer characterized by:

4. The automatic analyzer according to claim 1, The biasing member also operates in a vertical direction along the first protrusion when the reaction vessel is inserted. An automatic analyzer characterized by:

5. An automatic analyzer for analyzing a mixture of a specimen and a reagent contained in a reaction vessel, comprising: a heat block including a hole into which the reaction vessel is inserted and a biasing member for biasing the reaction vessel; the reaction vessel has a first protrusion on a part of a side surface, the biasing member is configured to operate to retreat to the outside of the reaction vessel along the first protrusion when the reaction vessel is lowered vertically from the upper side to the lower side when the reaction vessel is inserted into the hole, and to bias the first protrusion vertically downward when the reaction vessel is accommodated in the hole; The biasing member also moves in a vertical direction along the first protrusion when the reaction vessel is inserted, and includes a stopper to prevent the biasing member from moving beyond a certain amount. An automatic analyzer characterized by:

6. The automatic analyzer according to claim 5, the biasing member allows a predetermined vertical movement even when the reaction vessel is not present, and includes a stopper having an inclination that allows further vertical movement as the biasing member retreats to the outside of the reaction vessel along the first protrusion when the reaction vessel is inserted; An automatic analyzer characterized by:

7. An automatic analyzer for analyzing a mixture of a specimen and a reagent contained in a reaction vessel, comprising: a heat block including a hole into which the reaction vessel is inserted and a biasing member for biasing the reaction vessel; the reaction vessel has a first protrusion on a part of a side surface, the biasing member is configured to operate to retreat to the outside of the reaction vessel along the first protrusion when the reaction vessel is lowered vertically from the upper side to the lower side when the reaction vessel is inserted into the hole, and to bias the first protrusion vertically downward when the reaction vessel is accommodated in the hole; the biasing member is guided to be accommodated at a predetermined height when the reaction container is not present, and includes a stopper having an inclination that allows vertical movement as the biasing member retreats to the outside of the reaction container along the first protrusion when the reaction container is inserted; An automatic analyzer characterized by:

8. The automatic analyzer according to claim 7, the biasing member allows a predetermined vertical movement even when the reaction vessel is not present, and includes a stopper having an inclination that allows further vertical movement as the biasing member retreats to the outside of the reaction vessel along the first protrusion when the reaction vessel is inserted; An automatic analyzer characterized by:

9. A reaction vessel for containing a mixture of a sample and a reagent, A first protrusion for biasing the housing by a spring is provided on a part of the side surface of the housing. a second protrusion that is a part of the side surface and is provided at a position that is off a line perpendicular to the first protrusion, for guiding the light-transmitting surface to be vertical; The lowermost surface of the first protrusion is provided above a liquid level when the reaction liquid amount in the reaction vessel is at a maximum. A reaction vessel characterized by:

10. (delete)

11. A reaction vessel for containing a mixture of a sample and a reagent, A first protrusion for biasing the housing by a spring is provided on a part of the side surface of the housing. a second protrusion that is a part of the side surface and is provided at a position that is off a line perpendicular to the first protrusion, for guiding the light-transmitting surface to be vertical; A lowermost surface of the first projection is located below a lowermost surface of the second projection. A reaction vessel characterized by:

12. A reaction vessel for containing a mixture of a sample and a reagent, A first protrusion for biasing the housing by a spring is provided on a part of the side surface of the housing. a second protrusion that is a part of the side surface and is provided at a position that is off a line perpendicular to the first protrusion, for guiding the light-transmitting surface to be vertical; The first protrusion is provided on a surface parallel to the light-transmitting surface. A reaction vessel characterized by:

13. The reaction vessel according to any one of claims 9, 11 and 12, The second projections are provided in a pair at opposing positions on the side surface. A reaction vessel characterized by:

Images