JPH11271305A - Biochemical analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure an ionic activity with good accuracy in a biochemical analyzer by which the ionic activity of a sample liquid such as blood or the like can be measured. SOLUTION: When a detection means 150 detects that a slide for ionic- activity measurement is moved to a position faced with an analyzer used to measure an ionic activity, an electrification stop means 151 stops the electrification of electric components which are not required for the measurement of the ionic activity. Thereby, an electric noise (induction) which is generated from the electric components does not affect the measurement of the ionic activity, and the ionic activity can be measured with good accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biochemical analyzer for determining the concentration of a predetermined biochemical substance in a sample liquid using a chemical analysis element on which a sample liquid such as blood or urine is spotted. It is.

[0002]

2. Description of the Related Art Heretofore, a dry-type chemical analysis element capable of quantitatively analyzing a specific chemical component or material contained in a sample liquid simply by spotting and supplying a small droplet of the sample liquid. Has been put to practical use. In addition, in order to perform quantitative analysis of chemical components and the like in a sample liquid using such a chemical analysis element, after the sample liquid is spotted on the chemical analysis element,
This is kept at a constant temperature for a predetermined time (incubation) in an incubator (incubator) to produce a color reaction (dye formation reaction).
Then, the chemical analysis element is irradiated with measurement irradiation light having a wavelength selected in advance by a combination of a predetermined biochemical substance in the sample solution and a reagent contained in the chemical analysis element, and its optical density is measured. From this optical density, a substance concentration of a predetermined biochemical substance in a sample solution is obtained using a calibration curve representing a correspondence between an optical density determined in advance and a substance concentration of a predetermined biochemical substance. Biochemical analyzer is used.

In this biochemical analyzer, the chemical analysis elements are sequentially transported to an incubator, and the measured chemical analysis elements are taken out of the incubator and disposed of for disposal. , JP 61
-26864, U.S. Pat.No.4,296,069, etc., the chemical analysis element is carried into the disc-type incubator from the outer side, and the chemical analysis element whose measurement has been completed is taken from the inner side of the incubator. It is provided so as to be carried out by being pushed out or taken out from the outer peripheral side, and to be discarded.

Further, a chemical analysis element having a sample liquid spotted thereon is linearly transported by a transport means and inserted into a storage section of a rotary incubator having a storage section for storing a plurality of chemical analysis elements one by one. Then, a predetermined incubation is performed in the storage section, the color reaction of the chemical analysis element is measured from the bottom of the storage section, and the chemical analysis element whose measurement has been completed is further transported toward the center of the incubator by the transporting means. There is also known a biochemical analyzer which is dropped into a disposal hole opened at the center and disposed of (JP-A-6-66818).

On the other hand, an ion activity measuring device capable of measuring the ion activity of specific ions contained in a sample solution is disclosed in, for example, US Pat. No. 4,257,862, Japanese Patent Publication No. 58-4981, and
58-156848, JP-A-58-211648, and JP-B-6-82113. Such a chemical analysis element used in the ion activity measuring device includes at least one pair of ion selective electrodes including an ion selective electrode that generates a potential corresponding to the ion activity of a specific ion, and the ion selective electrode. A porous bridge having a porous bridge arranged so as to communicate between both electrodes of a pair, and a reference solution having a known ion activity of a specific ion and a sample solution having an unknown ion activity of an ion are used as an ion selective electrode. The liquid is applied to one electrode of the pair and the other electrode by spot application, and the interface between the two liquids is brought into contact (liquid junction) by the action of the porous bridge to establish electrical continuity. A potential difference is generated in accordance with the difference in the ion activity of the ions existing between the sample liquids. Therefore, if the potential difference is measured, the potential difference in the sample liquid is determined based on a calibration curve previously obtained (the principle is based on the Nernst equation). So that the ion activity of constant ion is obtained.

As a measuring device for measuring ion activity using such a chemical analysis element, an analyzer having a function of spotting and supplying a reference liquid and a sample liquid and measuring a potential difference may be used. preferable. This type of analyzer sends the chemical analysis element to the potential difference measuring section after the spotting of the reference liquid and the sample liquid, where the potential measuring probes are brought into contact with both electrodes of the electrode pair to measure the potential difference between the electrodes. It has such a configuration.

On the other hand, a biochemical analyzer provided with both a color reaction measuring unit for measuring a color reaction of a sample solution and an ion activity measuring unit for measuring an ion activity is proposed by the present applicant. (For example, Japanese Patent Application No. 10-14466). According to such a biochemical analyzer, the chemical analysis element for measuring the color reaction and the chemical analysis element for measuring the ion activity are simultaneously transported, and inserted into the incubator to measure the color reaction and measure the ion activity. Both the measurement of the quantity and the quantity can be carried out in one device.

[0008]

However, the measurement of the ion activity is to measure the minute potential difference of the sample solution, and the measurement of the color reaction is to optically measure the minute concentration difference of the sample solution. Therefore, electric noise (induction) by electric components such as a heater for controlling the temperature of the incubator, a motor for rotating the incubator, a pump for sucking the sample liquid, and a valve for switching the negative pressure of the pump. ) Adversely affects the measurement of the ion activity or the color reaction, and as a result, the ion activity or the color reaction may not be accurately measured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a biochemical analyzer capable of reducing the influence of electrical noise when measuring ion activity or color reaction. It is.

[0010]

A biochemical analyzer according to the present invention is a biochemical analyzer for determining the concentration of a predetermined biochemical substance in a sample solution using a chemical analysis element onto which the sample solution has been spotted. A color reaction measuring section for measuring a color reaction of the chemical analysis element which causes an optical density change due to a chemical reaction with a predetermined biochemical substance contained in the sample liquid, and / or measuring an ion activity of the sample liquid. A measuring means having an ion activity measuring unit for performing the measurement, and an energization stop for stopping energization to an electric component unnecessary for the measurement of the ion activity or the color reaction at least at the time of measuring the ion activity or the color reaction. Means.

Here, "at least when measuring the ion activity or the color reaction" includes not only the time when the ion activity or the color reaction is measured, but also before the measurement of the ion activity or the color reaction. It is a thing. Further, "electrical components unnecessary for measurement of ion activity or color reaction" is an electrical component not directly involved in measurement of ion activity or color reaction, for example,
A heater for controlling the temperature of the incubator described above, a motor for rotating the incubator, a pump for sucking the sample solution, a valve for switching the negative pressure of the pump, and a color reaction for measuring the ion activity. Refers to optical components and electrical components such as analyzers that measure ion activity during color reaction measurement.

[0012]

According to the biochemical analyzer of the present invention, when at least the ion activity or the color reaction is measured, the power supply to the electric parts unnecessary for the measurement of the ion activity or the color reaction is stopped. Therefore, no electrical noise (induction) is generated from these electric components. Therefore, the measurement of the ion activity or the color reaction is not affected by the electrical noise (induction) generated from these components, and thus, the ion activity or the color reaction can be accurately measured. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic plan configuration of a biochemical analyzer according to an embodiment of the present invention.

The biochemical analyzer 10 includes a blood filtration device 9 for separating plasma from blood, a slide standby unit 12 for storing unused chemical analysis slides 11, and a plasma (whole blood, serum, Urine and the like are also possible, but only the plasma will be described in the present embodiment), a spotting portion 13 for spotting a sample solution, and an incubator 14 containing the chemical analysis slide 11 and holding at a constant temperature for a predetermined time, The chemical analysis slide 11 is sequentially spotted from the slide standby section 12 by the transport means 15
13 and slide it on the chemical analysis slide
On the other hand, the nozzle tip 25 (see FIG. 9) is attached to the tip of the spotting nozzle 91 of the spotting means 17 (sampler), and then the sample liquid (plasma) is inserted into the nozzle tip 25 from the sample container 16 (sample rack). ), A predetermined amount of spotting is performed on the slide 11, and the spotted chemical analysis slide 11 is transported by a transport unit.
15 is inserted into the storage section 55 of the incubator 14, and the degree of coloration (reflection optical density) of the chemical analysis slide 11 kept at a constant temperature by the incubator 14 is measured by the photometric head 27 of the measuring means 18.
Or the ion activity is measured by the analyzer 21 using the chemical analysis slide 11 'for measuring the plasma ion activity, and further, the chemical analysis slide 11 after the measurement (or 11', hereinafter represented by 11). Is dropped and discharged into a disposal hole 56 on the center side of the incubator 14 by the transport means 15. Incidentally, the spotting means 17 is provided with a syringe means 19 for performing suction and discharge of the sample liquid by the nozzle tip 25,
The used nozzle tip 25 is detached from the spotting nozzle 91 at the tip extracting section 20 disposed near the incubator 14 and is dropped and discarded.

FIG. 12 shows the structure of a chemical analysis slide 11 used to measure the degree of coloration of plasma and a chemical analysis slide 11 'used to measure the ionic activity of plasma. As shown in Figure 12, chemical analysis slide
Reference numeral 11 denotes a rectangular mount in which a reagent layer is disposed, and a spotting hole 11a is formed in the surface of the mount. Spotting hole 11
Plasma is spotted on a as described below. On the other hand, the chemical analysis slide 11 'has substantially the same shape as the chemical analysis slide 11, and has two liquid supply holes 11c and 11d. Plasma is spotted on the liquid supply hole 11c as described later, and a reference liquid having a known ion activity is spotted on the liquid supply hole 11d. The chemical analysis slide 11 'is provided with three pairs of ion selective electrodes 11e, 11f, 11g which are electrically connected to the electrodes of the analyzer 21 for measuring the ion activity. Each ion selection electrode pair 11e, 11f, 11g is C
l ^-, K ^+, and those having an ion-selective layer for Na ^+. In addition, barcodes for specifying inspection items and the like are attached to the back surfaces of the chemical analysis slides 11 and 11 '.

The structure of each part will be described. First, as shown in FIG. 2 and FIG.
It comprises a holder 1 attached to the opening of the blood collection tube 7 accommodated in 16 and a suction means 2 connected to the holder 1 to apply a negative pressure for separating plasma from blood. The holder 1 includes a holder body 1A and a lid 1B made of plastic.
The holder body 1A has an insertion portion 1a inserted into the blood collection tube,
A filter holding portion 1b into which the filter 3 made of glass fiber is inserted, and a flange portion 1c joined to the lid 1B by ultrasonic welding or the like. The lid 1B includes a flange 1d joined to the holder body 1A, a cup 1e for holding the plasma filtered by the filter 3, and a filter 3 attached to the cup 1e.
And a nozzle-shaped supply port 1f for supplying the plasma from the nozzle.

The suction means 2 has an arm 2a attached to a shaft member 4 rotatably supported on a base 31. arm
A suction part 2b that comes into contact with the lid 1B of the holder 1 is provided below the front end of 2a, and this suction part 2b is connected to a negative pressure supply part 2c that is connected to a pump (not shown). Further, the negative pressure supply section 2c is provided with a release valve for releasing negative pressure from the pump. Further, a liquid level detection sensor 2d for detecting the level of the plasma supplied to the cup 1e and preventing the plasma from overflowing from the cup 1e is provided in the suction cup 2b. A timing belt 5 (see FIG.
The timing belt 5 is also wound around the pulley 6a of the drive motor 6, and the shaft member 4 is driven to reciprocate by the forward and reverse rotation of the drive motor 6. .

As shown in FIG. 3, the shaft member 4 is rotatably attached to a support member 63 installed on the base 31. A feed screw 64 is rotatably supported between the support member 63 and the base 31 in a vertical direction. Lead screw 64
A pulley 65 is fixed to the lower end of the drive motor 66.
A timing belt 68 is wound around the drive pulley 67. Further, the feed screw 64 penetrates a fixing member 69 attached to the shaft member 4, and a feed screw 64
A nut member 69a screwed to the screw 64 is provided, and the shaft member 4 is configured to move up and down in accordance with the rotation of the feed screw 64.

When separating plasma from blood,
Holder 1 in blood collection tube 7 stored in sample storage unit 16
Of the arm 2a from the initial position shown by the solid line in FIG. 1 to the position shown by the imaginary line.
The holder 2b is made to face the holder 1, and the arm 2a is further lowered to bring the lid 1B of the holder 1 and the suction cup 2b of the arm 2a into contact with each other. Next, a pump (not shown) is driven to apply a negative pressure to a space formed between the lid 1B and the suction cup 2b. Thereby, as shown in FIG. 4, the whole blood in the blood collection tube 7 is sucked up from the insertion portion 1a, filtered by the filter 3, and supplied to the cup 1e via the nozzle supply port 1f.

The liquid level detecting sensor 2d irradiates the liquid level of the plasma supplied to the cup 1e with light, and optically detects the reflected light. The plasma liquid level is substantially the same as the height of the cup 1e. Is set to output the maximum signal value when. Therefore, when the maximum signal value is output from the liquid level detection sensor 2d, the release valve of the negative pressure supply unit 2c is opened to stop blood suction. Thereafter, the arm 2a is moved up to the original position (see the solid line in FIG. 1), and the filtration is completed.

Next, as shown in FIG. 5, the transport means 15 includes a transport table 30 which extends linearly toward the center of the incubator 14 and a leg 30a at the front and rear ends thereof is a flat plate having a lower portion. The slide stand 12 is disposed at a substantially central portion of the transfer base 30, and the spotting portion 13 is disposed on the incubator 14 side.

The slide standby section 12 has a chemical analysis slide
A slide guide 32 for holding the chemical analysis slides 11 is formed, and a plurality of unused chemical analysis slides 11 are usually stacked and held on the slide guide 32. The slide guide 32 is mounted on the concave portion of the transport base 30 so that the lowermost chemical analysis slide 11 is positioned at the same height as the transport surface of the transport base 30. An opening 32a through which only the chemical analysis slide 11 can pass is formed. An opening through which an insertion member described later can be inserted is formed on the rear surface side, and a groove communicating with a slit 30b described later formed on the carrier 30 is formed on the bottom surface.
32b is formed. Note that a cartridge containing a plurality of chemical analysis slides 11 stacked on each other may be set in the slide guide 32.

In the spotting section 13 in front of the slide standby section 12,
A slide holder 33 having a circular opening 33a is provided. The slide holder 33 is slightly movably accommodated in a cover 34 fixed above the transfer table 30, and a glass fixed above the cover 34. The plate 35 also has an opening 35a for spotting. A bar code reader 130 (see FIG. 1) for reading a bar code provided on the chemical analysis slide 11 is attached to the spotting portion 13. The barcode reader 130 is provided for specifying inspection items and the like, and for detecting the transport direction (front and back, front and back) of the chemical analysis slide 11.

The transport of the chemical analysis slide 11 is performed by a forward movement of a plate-shaped insertion member 36 placed on the transport table 30. That is, a slit 30b extending in the front-rear direction is formed at the center of the transfer table 30.
An insertion member 36 is slidably mounted on the upper surface 30b, and a block 37 is fixed to the rear end bottom of the insertion member 36 from below through a slit 30b, and the block 37 is provided slidably in the front-rear direction along the slit 30b. Have been. An auxiliary plate 38 for pressing the insertion member 36 is disposed on the transfer table 30 at a position behind the slide standby unit 12 by the slide guide 32, and the auxiliary plate 38 is held in the cover 39 so as to be able to move slightly up and down. Have been.

A slider 40 is attached to a lower portion of the block 37, and the slider 40 is slidably supported in a front-rear direction by a guide rod 41 arranged along the carrier 30. Further, a part of a belt 44 wound around pulleys 42 and 43 disposed before and after the transfer table 30 is fixed to the slider 40. The rear pulley 43 is driven to rotate by a transport motor 45, and the insertion member 36 is moved in the front-rear direction by a block 37 that moves integrally with the slider 40, and the leading end thereof moves the chemical analysis slide at the lower end of the slide guide 32. By pushing the rear end of the slide 11, the chemical analysis slide 11 is transported linearly from the spotting unit 13 to the incubator 14.

The chemical analysis slide 11 at the lower end of the slide guide 32 is transported to the spotting unit 13 by driving the transport motor 45,
The chemical analysis slide 11 on which the sample solution is spotted is further inserted into the storage section 55 of the incubator 14, and the chemical analysis slide 11 after the measurement is further transported to the disposal hole 56 at the center of the incubator 14. The drive control of the motor 45 is performed.

Next, as shown in FIG. 6, the incubator 14 has a disk-shaped rotating member 50 rotatable with respect to a bearing 53 via a bearing 52 by a rotating cylinder 51 having a lower center. The upper member 54 is supported on the rotating member 50. The bottom surface of the upper member 54 is flat, and a plurality of (six in the case of FIG. 1) concave portions are formed on the upper surface of the rotating member 50 at predetermined intervals on the circumference so that a slit-shaped space is formed between the two members 51 and 54. A storage section 55 is formed.
The height of the bottom surface is set to be the same as the height of the transfer surface of the transfer table 30 of the transfer means 15, and the outer peripheral portion of the rotating member 50 is located close to the tip of the transfer table 30.

The inner hole of the rotary cylinder 51 is formed in a waste hole 56 of the chemical analysis slide 11 after the measurement, and the diameter of the waste hole 56 is set to a size through which the chemical analysis slide 11 can pass. An opening communicating with the disposal hole 56 is provided at the center of the rotating member 50.
50a is formed. The central portion of the storage portion 55 communicates with the central opening 50a at the same height as the storage portion 55,
When the chemical analysis slide 11 located in the storage section 55 moves to the center side as it is, it is configured to drop into the disposal hole 56.

A heating means (not shown) is provided on the upper member 54 to maintain the temperature of the chemical analysis slide 11 in the accommodating portion 55 at a constant temperature by adjusting the temperature thereof. A holding member 57 for holding the mount of the slide 11 from above to prevent evaporation of the sample liquid is provided.
While a cover 58 is provided on the upper surface of the upper member 54, the incubator 14 is covered at the top and sides by an upper cover 59, and at the bottom by a lower cover 60 to shield light. In the heating means, the part for measuring the coloration degree of the chemical analysis slide 11 is set at 37 ± 0.2 ° C. in the storage part 55 in the incubator 14 and the part for measuring the ion activity is set at 30 ± 0.2 ° C. Heat to 1 ° C. This heating means must maintain different parts at different temperatures in the measurement method, but in this embodiment, since only one heating means is provided, the part for measuring the ion activity is the rotating member 50 and The shape of the holding member 57 'is changed so that the temperature does not rise. Details will be described later.

Further, the chemical analysis slide 11 of the rotating member 50
In the center of the bottom of each storage section 55 that stores
Is formed, and the reflection optical density of the chemical analysis slide 11 is measured by the photometric head 27 disposed at the position shown in FIG. 1 through the opening 55a. Also, one of the storage sections 55b has a storage section 55b for ion activity measurement described later.
A pair of electrode holes 55c, 55d and 55f (see FIG. 1) are formed, and a chemical analysis slide 11 'for measuring ion activity is formed.
Is stored in the storage section 55b.

Here, the rotational drive of the incubator 14 is as follows.
A timing belt (not shown) is wound around the outer peripheral portion of the rotary cylinder 51 that supports the rotating member 50, and this timing belt is also wound around a drive pulley (both not shown) of the drive motor. The rotary member 50 is configured to perform reciprocal rotary drive by rotary drive. And the rotation operation of the incubator 14
First, for the photometric head 27 disposed below the predetermined rotation position of 14, the density of the white reference plate is detected, and then the density of the black reference plate is detected and calibrated. 55
The optical density of the color reaction of the chemical analysis slide 11 inserted into the slide 11 is measured. After this series of measurements, the slide 11 is rotated backward to return to the reference position, and the next slide 11 or slide 11 'is measured. Thus, the reciprocating rotation drive is controlled within a predetermined angle range. On the other hand, when measuring the ion activity, after storing the chemical analysis slide 11 'in the storage section 55b, the storage section 55b is rotated to a position corresponding to the analyzer 21, and the ion activity is measured. Thereafter, control is performed so as to perform a reciprocal rotation drive within a predetermined angle range so as to reversely rotate and return to the reference position, and measure the next slide 11 ′ or slide 11.

Further, a collection box 70 for collecting the chemical analysis slide 11 after the measurement is provided below the incubator 14. The collection box 70 has a storage chamber 71 formed below the disposal hole 56 at the center of the rotary cylinder 51, and the storage box 71 is formed in the incubator 14 in relation to the arrangement of other various devices. Is formed wider on one side with respect to the center point. In the corner of the storage chamber 71, an inclined portion 72 into which a nozzle tip 25 to be replaced for each sample liquid in the spotting means 17 described below falls.
Are formed. The inclined portion 72 is located below the chip extracting portion 20 from which the nozzle tip 25 is dropped, and the bottom surface of the inclined portion 72 tilts the falling nozzle tip 25 and guides the nozzle tip 25 toward the center of the accommodation chamber 71. It is formed on a slope (20-45 °) with the 71 side lower.

A projection 73 is provided at the bottom of the storage chamber 71 at a position deviated from the center of the disposal hole 56 to the opposite side to the widened portion of the storage chamber 71. The projection 73 has a spherical or needle-like tip, and has a function of coming into contact with the chemical analysis slide 11 falling from the waste hole 56, changing the falling direction thereof, and dispersing the same.

As shown in FIG. 1, an analyzer for measuring ion activity is provided below the rotating member 50 on the front side.
21 are arranged. This analyzer 21 is disclosed in, for example, U.S. Patent No. 4,257,862, Japanese Patent Publication No. 58-4981,
No. 6848, Japanese Patent Application Laid-Open No. 58-211648, Japanese Patent Publication No. 6-82113, etc., and the structure thereof is shown in FIG. 7 and FIG. 8 which is a sectional view taken along the line II of FIG. As shown in FIGS. 7 and 8, three pairs of through holes 110,
111, 112 are formed, and each through hole 110, 111, 11 is formed.
In FIG. 2, three pairs of potential measuring probes 113, 114 and 115 are provided so as to be movable in the vertical direction in FIG. Since the configuration of each probe 113, 114, 115 is the same, the probe 113 will be described with reference to FIG.

As shown in FIG.
Is fixed to a guide member 121 which is guided up and down by a fixing member 120 erected on a base 150, and is electrically connected to a measuring section 122 of the analyzer 21. Guide member
The holding member 123 for holding the chemical analysis slide 11 'together with the holding member 57' is provided on the 121. The holding member 57 'is different from the holding member 57 described above in that the slide 11'
In order to reduce the contact with the slide 11 'and to prevent the reference solution and the sample solution from coming into contact with the swelling of the slide 11', the recess is formed on the slide 11 'side. The guide member 121 is biased downward in FIG. 8 by a spring (not shown). A drive motor 124 is provided on the side of the guide member 121, and a cam member 125 is mounted on a rotation shaft of the drive motor 124. The cam member 125 is provided so as to face a contact portion 126 provided on the side of the guide member 121. When the drive motor 124 rotates, the cam member 125
Move from the position shown by the solid line in FIG. 8 to the position shown by the imaginary line, whereby the cam member 125 comes into contact with the contact portion 126 to guide the guide member 121, ie, the probe 113 and the holding member 123.
Moves upward. When the cam member 125 is not in contact with the contact portion 126, the potential measurement probes 113, 114, 11
5 is located on the surface of or inside the surface of the analyzer 21, but when the cam member 125 comes into contact with the contact portion 126, the ends of the potential measurement probes 113, 114, and 115 come from the surface of the analyzer 21 from the surface of the analyzer 21. The probe 113, 114, 115 is electrically connected to the ion selective electrode pair 11e, 11f, 11g of the chemical analysis slide 11 '.

A chemical analysis slide 11 'in which plasma is spotted in the plasma supply hole 11c and reference liquid is spotted in the reference liquid supply hole 11d.
Is stored in the storage section 55b, and the rotating member 50 is rotated so that the analyzer 21 and the storage section 55b face each other.
From below, through three pairs of electrode holes 55c, 55d, 55f, potential measuring probes 113, 114, 115 and holding member 12
Raise 3. The size of the notch of the housing portion 55b is the shape and size of the holding member 123, and at the same time, the transfer of heat from the rotating member 50 to the chemical analysis slide 11 'is minimized, so that the chemical analysis slide 11' Are formed so as to reach the above-mentioned temperature. This makes it possible to use chemical analysis slide 1
1 'is held between the holding member 123 and the holding member 57'. At this time, the ion selective electrode pair of the chemical analysis slide 11 '
Since potential differences corresponding to the differences in the respective ion activities of Cl ⁻ , K ⁺ , and Na ⁺ between the reference solution and the sample solution are generated between 11e, 11f, and 11g, the potential measurement probes 113, 114
, 115, the ion activity in the plasma can be measured by measuring the potential difference generated from each ion-selective electrode pair 11e, 11f, 11g. The ion activity measured in this way is displayed on a display unit such as a liquid crystal panel or recorded on a recording paper.

Next, as shown in FIG. 9, the sample holding section 16 has a reference liquid chip holding section 16a,
Electrolyte sample chip holding section 16b, reference liquid storage tube 16c, diluent chip holding section 16d, diluent cup 16e, mixing cup 16f, blood collection tube holding section 16g, and sample chip holding section 16
h are formed, and the reference liquid chip holder 16a, the electrolyte sample chip holder 16b, and the diluent chip holder 16
The reference liquid chip 25a, the electrolyte sample chip 25b, the diluent chip 25d, and the sample chip 25h are held in d and the sample chip holding section 16h, respectively. Here, since the diluent cup 16e and the mixing cup 16f are integrally formed, the molding of these cups 16e and 16f becomes easy. Further, the reference liquid chip holding portion 16a,
Electrolyte sample chip 16b, reference liquid storage tube 16c, diluent chip holder 16d, diluent cup 16e, mixing cup 16f
, Blood collection tube holder 16g and specimen chip holder 16h
Is a spotting arm of a spotting means 17 to be described later as shown in FIG.
It is set to be located on the turning locus of the spot wearing nozzles 91a and 91b accompanying the turning of 88. The sample container
Reference numeral 16 denotes consumables as a whole, and the entire sample storage unit 16 is replaceable with the biochemical analyzer according to the present embodiment.

Next, as shown in FIG. 10, the spotting means 17 has a flange member 83 rotatable via a bearing (not shown) with respect to a support member 80 installed on the base 31, as shown in FIG. Mounted on Guide rods 84, 84 are erected on both sides on the outer peripheral side of the flange member 83, and upper end portions of the guide rods 84, 84 on both sides are fixed to the connecting member 85, so that the two guide rods 84, 84 are vertically moved. It is arranged in parallel to. Further, a feed screw 86 is disposed vertically at the center of rotation of the connecting member 85, the upper end of the feed screw 86 is rotatably supported by the connecting member 85, and the lower end thereof is a flange member 83.
Is rotatably supported at a central portion thereof, and further has a pulley 87 fixed at a distal end portion protruding from the flange member 83. Further, the base end of the spotting arm 88 is supported by the guide rods 84, 84 on both sides so as to be able to move up and down freely, and a sleeve 89 into which the guide rods 84, 84 are inserted is interposed on the spotting arm 88 of the supporting portion. Have been. Further, the feed screw 86 penetrates the spotting arm 88, and a nut member 90 that is screwed to the feed screw 86 is provided in the penetrating portion, so that the spotting arm 88 moves up and down in accordance with the rotation of the feed screw 86. Is configured.

FIG. 10 is an enlarged view taken in the direction of arrow A in FIG.
As shown in FIG. 11, two spotting nozzles 91a and 91b are provided at the tip of the spotting arm 88 so as to penetrate vertically and suction and discharge the sample liquid. This point wearing nozzle 91
The shaft portions of a and 91b are slidably fitted to the spotting arm 88 and urged downward by springs 92a and 92b. The spotting nozzle 91a is for a sample and an electrolyte sample, and the spotting nozzle 91b is for a diluting liquid and a reference liquid. Further, the tip of the spotting nozzles 91a, 91b is attached to the pipette-shaped nozzle tips 25a, 25b, 25
d and 25h (represented by 25 hereinafter) are detachably mounted, and the unused nozzle tip 25 is set in the sample storage section 16, and this is turned on by the downward movement of the spotting arm 88. After fitting and holding the tips of the wearing nozzles 91a and 91b, after use, the fitting is performed by moving up the spotting arm 88 in a state where the upper end of the nozzle tip 25 is engaged with the engaging groove 20a of the tip extracting portion 20. It is removed and dropped into the collection box 70 below through the opening 20b of the chip extracting section 20 to be discarded.

The turning operation of the spotting arm 88 is performed by a flange member.
A timing belt 94 is engaged with an outer peripheral portion of the motor 83, and the timing belt 94 is wound around a drive pulley of a turning motor (not shown). The timing belt 94 is turned to a predetermined position by drive control of forward and reverse rotation of the turning motor. Is done. Also,
The raising and lowering movement of the spotting arm 88, that is, the rotation driving of the feed screw 86, is performed by winding a timing belt 99 between the pulley 87 at the lower end and the driving pulley of the raising and lowering motor. It is moved to a predetermined height by control.

Next, in the mechanism for sucking and discharging the sample liquid into the nozzle tip 25, air passages 101a and 101b are formed at the center of the spotting nozzles 91a and 91b.
Air pipes 110 are provided at upper end portions of the air passages 101a and 101b.
a and 110b are connected. The other ends of the air pipes 110a and 110b are connected to the right end of the syringe 102 of the syringe means 19 (FIG. 1).
See). The syringe 102 is a syringe-shaped air pump, and is configured to perform suction and discharge by operating the syringe 102. In addition, the spot wearing nozzles 91a, 91
The switching of the suction flow path in b is performed by switching a solenoid valve (not shown) provided in the syringe means 19.

The spotting means 17 causes the nozzle tip
With the tip immersed in diluent or plasma in the diluent cup 16e or the cup 1e of the plasma filtration device 9, the piston of the syringe 102 is moved down to perform suction,
By rotating to 13, a predetermined amount of spotting is performed on the chemical analysis slide 11.

Next, a description will be given of an energization stopping device for stopping the energization of the electric parts which are not necessary for the measurement of the ion activity in the measurement of the ion activity in the present embodiment. FIG. 13 is a schematic block diagram illustrating the configuration of the power supply stop device according to the present embodiment. As shown in FIG. 13, the power supply stopping device according to the present embodiment includes a detecting unit 150 for detecting that the slide 11 ′ conveyed to the storage portion 55b of the incubator 14 has moved to a position facing the analyzer 21; When it is detected by 150 that the slide 11 'has moved to a position facing the analyzer 21, there is provided an energization stopping means 151 for stopping the energization of electric components unnecessary for the measurement of ion activity.

Here, as electric parts unnecessary for the measurement of the ion activity, a drive motor 6 for reciprocatingly rotating the shaft member 4 of the suction means 2, a drive motor 66 for moving the shaft member 4 up and down,
A pump for applying a negative pressure when suctioning and filtering whole blood, a transport motor 45 for the transport means 15, a drive motor for rotating the incubator 14, a heating means for adjusting the temperature of the incubator 14, and a spotting arm 88 for the spotting means 17 Motor for reciprocating rotational movement, a drive motor for raising and lowering the spotting arm 88, a syringe 102 of the syringe means 19 for sucking and discharging plasma into the nozzle tip 25, a solenoid valve, and a measurement for measuring a color reaction. Means such as means 18. Then, when the current supply to these electric components is stopped, the current is supplied only to the analyzer 21 necessary for measuring the ion activity.

It should be noted that the supply of power to the electric parts unnecessary for the measurement of the ion activity may be stopped not only when the ion activity is measured but also before the measurement.
In addition to stopping the energization of these electric components at once, the energization may be sequentially stopped from those unnecessary for the measurement of the ion activity.

Next, the operation of this embodiment will be described.

FIGS. 14 to 19 are flowcharts for explaining the operation of the present embodiment. First, as shown in FIG. 1, before performing the analysis, the chemical analysis slides 11 and 11 'are set in the slide standby unit 12, and the consumable sample storage unit 16 is set, and then the analysis process is started. . At this time, the reference liquid chip holding section of the sample storage section 16
The reference solution chip 25a is provided for the electrolyte sample tip 16b, the reference solution storage tube 16c, the diluent chip holding unit 16d, the blood collection tube holding unit 16g, and the sample chip holding unit 16h, respectively.
, Electrolyte sample chip 25b, reference solution, diluent chip 2
5d, the blood collection tube 7 having blood for analysis and the sample chip 25h are held.

First, in step S1, the biochemical analyzer is initialized, and in step S2, the blood filtering device 9 is initialized.
Thus, the whole blood in the blood collection tube 7 is filtered to obtain a plasma component.
FIG. 15 shows a flowchart of the process performed in the blood filtration device 9. First, in step S21, the dirt on the liquid level detection sensor 2d is checked, and the cup 1e is checked.
The reference plate is set at the height position of and the gain of the liquid level detection sensor 2d is set. Next, in step S22, the suction part 2b of the arm 2a is rotated to a position facing the holder 1 (see the phantom line in FIG. 1), and the arm 2a is further lowered to lower the lid 1B of the holder 1 and the suction part of the arm 2a. 2b is brought into contact with each other. Then, in step S23, a pump (not shown) is driven to apply a negative pressure to a space formed between the lid 1B and the suction cup 2b. Thus, the blood is filtered by the filter 3 and the plasma is supplied to the cup 1e via the nozzle supply port 1f. At this time, the pressure of the pump may be checked to detect a leak or a hematogenous amount of blood.

In the next step S24, the liquid level detection sensor 2d detects that a predetermined amount of plasma has been supplied to the cup 1e, and stops driving the pump. At this time, instead of the liquid level detection sensor 2d, the drive of the pump may be stopped after a certain suction time has elapsed. Next, in step S25, the release valve of the negative pressure supply unit 2c is released to end the decompression,
In step S26, the arm 2a is lifted to release the contact between the lid 1B and the suction cup portion 2b, and the arm 2a is returned to the original position (see the solid line in FIG. 1), and the process ends.

Returning to FIG. 14, in step S3, the transfer means 15 applies the slide 11 from the slide standby section 12 to the slide section.
Transport to 13. Barcode reader in spotting section 13
The bar code provided on the slide 11 is read by 130, and the inspection item or the like of the slide 11 is detected. When the read inspection item is the ion activity measurement, the process proceeds to B described later, and when the read inspection item is the dilution request item, the process proceeds to A1 described later. If the read test item is the measurement of the degree of coloration, in the next step S4, the spotting arm 88 is moved to the sample storage section 16 and the sample chip 25h is mounted on the spotting nozzle 91a.
In step S5, the liquid level of the sample (plasma) supplied to the cup 1e is detected, and it is confirmed whether the liquid level and the required plasma are supplied to the cup 1e. Then, in step S6, the spotting arm 88 is lowered to aspirate the sample from the cup 1e to the sample chip 25h, and in step S6
The sample tip 25h from which the sample was aspirated in step 7
Then, the sample is spotted on the spotting hole 11a of the slide 11. At this time, the clogging of the tip 25h may be detected by monitoring the pressure change and comparing it with a predetermined value.

Then, in step S8, the slide 11 on which the sample is spotted is inserted into the incubator 14.
The internal temperature of the incubator 14 is set at 37 ± 0.2 ° C. for measuring the degree of coloration. At this time, slide
It may be detected whether or not 11 has been inserted into the incubator 14 without fail. When processing is performed continuously, in step S13, another slide 11 is conveyed to the spotting unit 13, the barcode is read, and the processing from step S6 to step S8 is performed. At this time, if the read test item is the ion activity measurement, the sample chip 25h is discarded as described later in step S14 and the process proceeds to B described later, and if the test item is a dilution request item, the process proceeds to A2 described later. .

When the slide 11 is inserted into the incubator 14, the storage section 55 of the incubator 14 is rotated, and the inserted slide 11 is sequentially moved to a position facing the photometric head 27. Then, in the next step S9, the photometric head
The measurement of the reflection optical density of the slide 11 by 27 is performed.
After the measurement is completed, the chemical analysis slide 11 after the measurement is pushed out to the center side of the incubator 14 by the transport means 15 for inserting the slide 11 into the incubator 14 and discarded. Then, the measurement result is output in step S11, and in step S12, the used sample tip 25h is detached from the spotting nozzle 91a by the tip extracting section 20 and dropped downward to be discarded, thus ending the processing.

Next, the case where the test item is a dilution request item will be described with reference to the flowcharts shown in FIGS. This dilution request item is performed, for example, when the blood concentration is too high to perform an accurate test. First, in step S31, FIG.
In the same manner as in step S4, the spotting arm 88 is moved to the sample storage section 16 and the sample tip 25h is mounted on the spotting nozzle 91a. In step S32, the liquid level of the sample (plasma) supplied to the cup 1e is detected, and it is confirmed whether the liquid level and the required plasma have been supplied to the cup 1e. In A2 in FIG. 14, the processing from step S33 is performed. Then, in step S33, the spotting arm 88 is lowered to remove the sample chip 25h from the cup 1e.
Aspirate the sample. At this time, the clogging of the chip 25h may be detected by monitoring the pressure change and comparing it with a predetermined value.

In the next step S34, the aspirated sample is dispensed from the sample chip 25h to the mixing cup 16f.
After dispensing the sample, in step S35, the used sample tip 25h is detached from the spotting nozzle 91a by the tip extracting section 20, and is dropped and discarded. Next, in step S36, the spotting arm 88 is moved to the sample container 16, and the diluting liquid tip 25d is mounted on the spotting nozzle 91b. In step S37, the liquid level of the diluent supplied to the diluent cup 16e is detected, and it is confirmed whether or not the liquid level and the required diluent have been supplied to the diluent cup 16e. Then, in step S38, the spotting arm 88 is lowered to suck the diluent from the diluent cup 16e to the diluent tip 25d. At this time, the clogging of the tip 25d may be detected by monitoring the pressure change and comparing it with a predetermined value.

In the next step S39, the sucked diluent is discharged from the diluent tip 25d to the mixing cup 16f. Then, in step S40, the diluent chip 25d
Is inserted into the mixing cup 16f, and stirring and discharging are repeated to perform stirring. After the stirring, the sample diluted in step S41 is sucked into the diluent chip 25d, and the spotting arm 88 sucking the sample diluted in step S42 is moved to the spotting unit 13, and the slide 11 is spotted. A specimen is spotted on the hole 11a. At this time, the clogging of the tip 25d may be detected by monitoring the pressure change and comparing it with a predetermined value. If the processing is to be performed continuously, the slide conveyance and the reading of the barcode are performed in step S43, and the processing in steps S41 and S42 is performed.

Then, in steps S45 to S49, step S in the flowchart of FIG.
From 8 to S12, photometry, slide discard, result output, and chip discard are performed, and the process ends.

Next, the case where the test item is the measurement of ion activity will be described with reference to the flowcharts shown in FIGS. In the case of the measurement of the ion activity, FIG.
The slide carried in step S3 is a chemical analysis slide 11 'for measuring the ion activity. First, in step S51, as in step S4 of FIG. 14, the spotting arm 88 is moved to the sample container 16, and the electrolyte sample chip 25b is mounted on the spotting nozzle 91a. Step S52
In, the liquid level of the sample (plasma) supplied to the cup 1e is detected, and it is confirmed whether the liquid level and the required plasma are supplied to the cup 1e. And step S
At 53, the spotting arm 88 is lowered to suck the sample from the cup 1e to the electrolyte sample chip 25b. At this time, the clogging of the tip 25b may be detected by monitoring the pressure change and comparing it with a predetermined value.

In the next step S54, the solenoid valve of the syringe means 19 is switched to switch the pressure flow path to the spotting nozzle 91b. Then, in step S55,
The spotting arm 88 is moved to the sample storage section 16 and the reference liquid tip 25a is mounted on the spotting nozzle 91b. Step S56
In, the liquid level of the reference liquid supplied to the reference liquid storage pipe 16c is detected, and it is confirmed whether the liquid level and the required reference liquid are supplied to the reference liquid storage pipe 16c. Then, in step S57, the spotting arm 88 is lowered to suck the reference liquid from the reference liquid storage tube 16c to the reference liquid tip 25a. At this time, the clogging of the tip 25a may be detected by monitoring the pressure change and comparing it with a predetermined value.

Next, in step S58, the flow path of the pressure is switched to the spotting nozzle 91a side by the solenoid valve of the syringe means 19, and in step S59, the electrolyte sample chip
The sample aspirated into 25b is spotted on the liquid supply hole 11c of the slide 11 '. Further, in step S60, the syringe means
The pressure flow path is switched to the spotting nozzle 91b side by the solenoid valve 19, and the reference liquid sucked by the reference liquid tip 25a in step S61 is spotted on the liquid supply hole 11d of the slide 11 '.

Then, in step S62, the slide 11 'on which the sample and the reference solution are spotted is placed in the incubator 14
Into the storage section 55b. Storage section of incubator 14
55b has an internal temperature of 30 ± 1 for measurement of ion activity.
It is set to ° C. At this time, it may be detected whether or not the slide 11 'has been securely inserted into the storage section 55b of the incubator 14. When the slide 11 'is inserted into the incubator 14, the storage section 55 of the incubator 14 is rotated, and the slide 11' inserted into the storage section 55b is moved to a position facing the analyzer 21. Then, in the next step S63, when the detection means 150 (for example, a sensor for optically detecting) detects that the slide 11 'has moved to a position facing the analyzer 21, in the next step S64,
Electric components unnecessary for the measurement of ion activity, that is, a drive motor 6 for reciprocatingly rotating the shaft member 4 of the suction means 2, a drive motor 66 for moving the shaft member 4 up and down, and a negative pressure for suction filtration of whole blood. Pump to operate, transport motor of transport means 15
45, a drive motor for rotating the incubator 14, a heating means for adjusting the temperature of the incubator 14, a drive motor for reciprocatingly rotating the spotting arm 88 of the spotting means 17, a driving motor for moving the spotting arm 88 up and down, a nozzle Syringe of syringe means 19 for aspirating and discharging plasma into tip 25
102, the solenoid valve, and the power supply to the measuring means 18 for measuring the color reaction are stopped by the power supply stopping means 151 during the measurement of the ion activity (about one minute). Note that these motors include energization for excitation.

At this time, the power supply to the heating means of the incubator 14 is also stopped, but the temperature at the time of measuring the ion activity is lower than the temperature at the time of measuring the color reaction, and the pressing member 57 'for holding the slide 11' is held. Unlike the holding member 57 for holding the slide 11, the slide 11 'is not heated, and the temperature does not change rapidly. For this reason, even if the heating means is stopped during the measurement of the ion activity (about 1 minute), the temperature change during that time hardly affects the measurement of the ion activity as compared with the electrical noise of the heating means. Things. However, when the environmental temperature is lower than usual, the heating unit may be stopped only during sampling (a plurality of times in several seconds) during the ion activity measurement. Further, when the ambient temperature is higher than usual, cooling by the cooling means may be considered.

Then, in the next step S65, measurement of ion activity (measurement of potential difference) by the analyzer 21 is performed. After the measurement is completed, in step S66, the electric components unnecessary for the measurement of the ion activity are sequentially energized as necessary, and in step S67, the chemicals after the measurement are carried out by the transfer means 15 for inserting the slide 11 'into the incubator 14. The analysis slide 11 'is pushed out to the center side of the incubator 14 and discarded. In step S68, the measurement result is output. Further, in step S69, the used reference solution tip 25a and electrolyte sample tip 25b are detached from the spotting nozzles 91a, 91b by the tip extracting section 20, and dropped and discarded. The process ends.

As described above, in the present embodiment, at least at the time of measuring the ion activity, the power supply to the electric parts (including the measuring means 18 for measuring the color reaction) unnecessary for the measurement of the ion activity is stopped. Therefore, no electrical noise (induction) is generated from these electrical components. Therefore, the measurement of the ion activity is not affected by the electrical noise generated from these components,
The ion activity can be measured accurately.

In the above-mentioned embodiment, only the case where the unnecessary electric parts and the supply of electricity are stopped when the ion activity is measured has been described. However, the same applies to the case where the color reaction is measured. It is possible to stop the supply of electric components unnecessary for measurement. As a result, the measurement result of the color reaction is not affected by electric noise generated from electric components unnecessary for the measurement of the color reaction, and the color reaction can be accurately measured.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a main mechanism of a biochemical analyzer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a blood filtration device.

FIG. 3 is a diagram showing a configuration of a blood filtration device.

FIG. 4 is a diagram for explaining a blood filtration state;

FIG. 5 is a cross-sectional front view of a transporting unit.

FIG. 6 is a sectional front view of a part of the incubator.

FIG. 7 is a diagram showing a configuration of an analyzer.

8 is a sectional view taken along line II of FIG. 7;

FIG. 9 is a diagram showing a configuration of a sample storage unit.

FIG. 10 is a cross-sectional front view of the spotting means.

11 is an enlarged view in the direction of arrow A in FIG. 10;

FIG. 12 is a diagram showing a configuration of a chemical analysis slide.

FIG. 13 is a schematic block diagram illustrating a configuration of an energization stopping device according to the present embodiment.

FIG. 14 is a flowchart showing a coloration degree measurement process;

FIG. 15 is a flowchart showing processing in the blood filtration device.

FIG. 16 is a flowchart showing processing for performing a dilution operation (part 1);

FIG. 17 is a flowchart illustrating processing for performing a dilution operation (part 2);

FIG. 18 is a flowchart showing an ion activity measurement process (part 1).

FIG. 19 is a flowchart showing an ion activity measurement process (part 2).

[Explanation of symbols]

 9 Hemofiltration device 10 Biochemical analyzer 11, 11 'Chemical analysis slide 13 Spotting section 14 Incubator 15 Transport means 16 Sample storage section 17 Spotting means 21 Analyzer 25 Nozzle chip 150 Detecting means 151 Power supply stopping means

Claims (1)

[Claims] 1. A biochemical analyzer for determining a concentration of a predetermined biochemical substance in a sample liquid using a chemical analysis element onto which the sample liquid is spotted, wherein the predetermined biochemical substance contained in the sample liquid is A measuring unit having a color reaction measuring unit for measuring a color reaction of the chemical analysis element which causes an optical density change due to a chemical reaction of and / or an ion activity measuring unit for measuring an ion activity of the sample liquid; At least at the time of measuring the ion activity or color reaction,
A biochemical analyzer, comprising: an energization stopping means for stopping energization of an electric component unnecessary for measurement of the ion activity or color reaction.