CN218601291U - Buffer solution assembly of sample analyzer and sample analyzer - Google Patents

Abstract

The application discloses sample analyzer's buffer solution subassembly, this buffer solution subassembly include buffer solution jar, connector and waste liquid subassembly. The buffer solution tank is used for storing a buffer solution of the sample analyzer; the first end of the connector is connected with the buffer liquid tank through a pipeline, and the second end of the connector is connected with the external air through a pipeline; the waste liquid subassembly passes through the pipeline and is connected with the third end of connector, and the waste liquid subassembly is used for collecting the buffer solution of buffer solution jar overflow. The utility model provides a buffer solution subassembly sets up the connector at the buffer solution jar, and the one end of connector is passed through the pipeline and is connected with the waste liquid subassembly, collects the buffer solution of buffer solution jar overflow through using the waste liquid subassembly, prevents that the buffer solution of overflow from dripping to the sample analyzer built-in, prevents effectively that the interior emergence circuit of sample analyzer from damaging and metal corrosion, improves sample analyzer's security and stability.

Description

Buffer solution assembly of sample analyzer and sample analyzer

Technical Field

The application relates to the technical field of medical equipment, in particular to a buffer solution assembly and a sample analyzer.

Background

In the field of medical devices, a sample analyzer is a common in vitro diagnostic analyzer, and is generally used for detecting and analyzing samples such as blood samples or body fluids. The immunoassay is an analysis method for detecting various substances (drugs, hormones, proteins, microorganisms, etc.) by using an antigen-antibody specific binding reaction, and a sample analyzer for immunoassay can perform immunoassay such as fluorescence, chemiluminescence, etc. by using a sample, and is a general instrument for hospital test. Among them, the fluid path system is a large important component of the sample analyzer, and the buffer solution in the fluid path system is usually used for washing and as a sheath solution for moving the sample.

In the existing buffer assembly design, a control means is usually used to control the opening and closing of the liquid pump so as to ensure that the liquid amount of the buffer liquid tank is in a controllable state. When a sensor device or program logic breaks down, the liquid pump cannot be closed in time, buffer liquid in the buffer liquid tank can overflow, and the buffer liquid tank is arranged at the position where circuit components in the sample analyzer are dense, so that the buffer liquid overflows to easily cause short circuit of circuits in the sample analyzer, and the sample analyzer breaks down.

SUMMERY OF THE UTILITY MODEL

The application provides a buffer solution subassembly and sample analysis appearance to solve the buffer solution jar weeping and lead to the technical problem of circuit short circuit easily.

In order to solve the above problems, the present application provides a first technical solution: the buffer solution component of the sample analyzer comprises a buffer solution tank, a connector and a waste solution component. The buffer solution tank is used for storing the buffer solution of the sample analyzer; the first end of the connector is connected with the buffer liquid tank through a pipeline, and the second end of the connector is connected with the external air through a pipeline; the waste liquid assembly is connected with the third end of the connector through a pipeline and is used for collecting buffer liquid overflowing from the buffer liquid tank.

The buffer solution component comprises a filter, one end of the filter is connected with the third end of the connector through a pipeline, and the other end of the filter is connected with the waste liquid component through a pipeline and used for filtering the buffer solution overflowing from the buffer solution tank.

The buffer solution component comprises a first check valve, one end of the first check valve is connected with the third end of the connector through a pipeline, and the other end of the first check valve is connected with the waste solution component through a pipeline.

And the second end of the connector is connected with an air filter of the sample analyzer through a pipeline.

Wherein, the waste liquid subassembly includes the waste liquid jar, the waste liquid jar is used for collecting the buffer solution of buffer solution jar overflow.

The buffer solution assembly comprises a second one-way valve, one end of the second one-way valve is connected with an air filter of the sample analyzer through a pipeline, and the other end of the second one-way valve is connected with the buffer solution tank through a pipeline.

The buffer solution component comprises a first liquid pump, one end of the first liquid pump is connected with the buffer solution tank through a pipeline, and the other end of the first liquid pump is connected with a buffer solution barrel located outside the sample analyzer through a pipeline.

Wherein the buffer assembly includes a controller electrically connected to the first fluid pump.

The buffer solution assembly comprises a float sensor, the float sensor is electrically connected with the controller, is arranged in the buffer solution tank and is used for monitoring the liquid level in the buffer solution tank, so that when the liquid level in the buffer solution tank reaches a preset requirement, the controller controls the pipeline where the first liquid pump is located to be switched on or switched off.

The float sensor is provided with two sections of float switches, the two sections of float switches are arranged in the buffer liquid tank, and the two sections of float switches are used for detecting the relation between the liquid level and the two heights in the buffer liquid tank.

In order to solve the above problem, the present application provides a second technical solution: there is provided a sample analyzer comprising the buffer assembly and the reagent module, wherein the buffer assembly comprises a second liquid pump, one end of the second liquid pump is connected with the buffer tank through a pipeline, and the other end of the second liquid pump is connected with the reagent module through a pipeline.

The application provides sample analyzer's buffer solution subassembly, this buffer solution subassembly includes buffer solution jar, connector and waste liquid subassembly. The buffer solution tank is used for storing a buffer solution of the sample analyzer; the first end of the connector is connected with the buffer liquid tank through a pipeline, and the second end of the connector is connected with the external air through a pipeline; the waste liquid subassembly passes through the pipeline and is connected with the third end of connector, and the waste liquid subassembly is used for collecting the buffer solution of buffer solution jar overflow. The utility model provides a buffer solution subassembly sets up the connector at buffer solution jar, and the one end of connector is passed through the pipeline and is connected with the waste liquid subassembly, collects the buffer solution of buffer solution jar overflow through using the waste liquid subassembly, prevents that the buffer solution of overflow from dripping in the sample analyzer machine, prevents effectively that the interior emergence circuit of sample analyzer from damaging and the metal corrosion, improves sample analyzer's security and stability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic structural view of one embodiment of a buffer assembly provided herein;

FIG. 2 is a schematic diagram of another embodiment of a buffer assembly provided herein.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish different objects, and are not used to describe a particular order. Furthermore, the terms "include" and "provided," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The application firstly provides a buffer solution component of a sample analyzer, and the buffer solution component is applied to the field of medical or biochemical analysis and used for storing buffer solution and treating waste liquid in the sample analyzer. A more common sample analyzer may be an immunoassay analyzer; the sample analyzer may also be other clinical laboratory equipment.

The sample analyzer of the present application can be used to perform fluorescence detection on a sample. The immunoassay analyzer comprises a transportation module, a sampling module, a reagent module, a reaction module, a magnetic separation module and a fluorescence detection module. When the device is used, the original sample is transferred to the sampling module through the transportation module, the sampling module is used for sampling the original sample quantitatively, and the original sample is transferred to the reaction module to wait for reaction. The reagent module is used for accommodating and preparing reagents required by sample detection, the transportation module transports the reagents which need to be added into the samples to a reagent station, and reagent needles of the reagent module suck corresponding reagents and accurately and quantitatively add the reagents into a reaction disc of the reaction module, wherein the reagents comprise magnetic beads with specific antibodies.

The sampling needle adds the original sample to the reaction disc, and in order to make the antigen in the original sample combine with the specific antibody in the reagent, the original sample needs to be incubated in the reaction disc for a period of time. After incubation is finished, the magnetic separation module performs magnetic separation on the incubated sample mixture, cells which do not react with specific antibodies are separated in the magnetic separation module through an immunomagnetic bead separation technology, and magnetic bead compositions obtained through magnetic separation are cleaned, so that reagents which cannot be combined with magnetic beads in the reaction disc and other wastes are cleaned, and then a sample to be detected is obtained. The fluorescence detection module detects a sample to be detected and converts photoelectric data to obtain detection data.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a buffer assembly provided in the present application. As shown in fig. 1, the buffer assembly 10 of the present embodiment includes a buffer tank 110, a connection head 210, and a waste assembly 310. The buffer tank 110 is used for storing a buffer solution of the sample analyzer; a first end of the connector 210 is connected with the buffer tank 110 through a pipeline, and a second end of the connector 210 is connected with the external air through a pipeline; the waste liquid assembly 310 is connected to the third end of the connection head 210 through a pipeline, and the waste liquid assembly 310 is used for collecting the buffer solution overflowing from the buffer solution tank 110.

Specifically, a buffer assembly 10 is disposed in the sample analyzer, and the buffer assembly 10 is in fluid connection with a reagent module of the sample analyzer, so that the sample analyzer can directly call the buffer from the buffer assembly 10 when the buffer needs to be used. The buffer assembly 10 includes a buffer tank 110, a connection head 210, and a waste assembly 310.

The buffer tank 110 is used for storing the buffer solution of the sample analyzer, and in order to ensure the stable air pressure of the buffer tank 110, the buffer tank 110 is communicated with the atmosphere through one end of the connection head 210. The connection head 210 is used to connect the buffer tank 110 and the waste liquid assembly 310, so that the waste liquid assembly 310 collects the buffer solution overflowing from the buffer tank 110. The connector 210 includes, but is not limited to, a T-joint, a Y-joint.

The buffer of buffer assembly 10 can be used for washing in a sample analyzer, specifically, washing includes, but is not limited to, reagent needle washing, cuvette washing, magnetic bead washing, and the like. When various reagents are filled into a reaction disc, a reagent module of the sample analyzer is provided with a cleaning position, and after one reagent is filled into a reagent needle each time, the reagent needle needs to be cleaned at the cleaning position, so that the reagent needle is prevented from polluting other reagents in the reuse process; a plurality of reaction cup positions are arranged on a reaction disc of the sample analyzer, reagents, magnetic beads, original samples and the like are filled in the reaction cups, and after detection is finished, liquid in the reaction cups needs to be sucked and the reaction cups need to be cleaned, so that the accuracy of subsequent detection results is prevented from being influenced; in the magnetic separation module, it is necessary to wash out the reagents and other waste materials in the reaction disk that are not bound to the magnetic beads to wash away the unbound substances in the reaction solution and interfering substances during the reaction.

The buffer of buffer assembly 10 can also be used as a sheath fluid in a sample analyzer. Specifically, the sample analyzer further comprises a flow detection module, wherein a flow chamber is arranged in the flow detection module, the flow chamber is used for detecting the number of particles in the sample, a complex pipeline is arranged inside the flow chamber, a sheath liquid is stored in the pipeline, so that the cell particles in the sample can be uniformly distributed in the sheath liquid, and the sheath liquid can push the sample to move, so that the sample analyzer can count and detect the number of particles in the sample.

Since the buffer solution of the buffer solution assembly 10 is mainly used to provide the cleaning solution and the sheath solution for the flow detection module and the fluorescence detection module, the buffer solution tank 110 is placed at a position where the pipelines and the instruments of the sample analyzer are complex, so that the structure of the sample analyzer is more compact. Therefore, when the buffer solution in the buffer solution tank 110 overflows, the buffer solution overflows to other instruments and circuit components in the sample analyzer, metal devices in the sample analyzer easily rust, and the short circuit of the instrument circuit is easily caused, so that the service life of the sample analyzer is influenced.

In this embodiment, the buffer assembly 10 includes a buffer tank 110, a connector 210, and a waste assembly 310. The buffer tank 110 is used for storing a buffer solution of the sample analyzer; a first end of the connector 210 is connected with the buffer tank 110 through a pipeline, and a second end of the connector 210 is connected with the external air through a pipeline; the waste liquid assembly 310 is connected to the third end of the connection head 210 through a pipeline, and the waste liquid assembly 310 is used for collecting the buffer solution overflowing from the buffer solution tank 110. Buffer solution subassembly 10 of this embodiment sets up connector 210 at buffer solution jar 110, and the one end of connector 210 is passed through the pipeline and is connected with waste liquid subassembly 310, collects the buffer solution of buffer solution jar 110 overflow through using waste liquid subassembly 310, prevents that the buffer solution of overflow from dripping in the sample analyzer machine, prevents effectively that the interior emergence circuit of sample analyzer from damaging and the metal corrosion, improves sample analyzer's security and stability. In one embodiment, the buffer assembly 10 includes a filter 311, one end of the filter 311 is connected to the third end of the connector 210 through a pipeline, and the other end of the filter 311 is connected to the waste liquid assembly 310 through a pipeline, for filtering the buffer solution overflowing from the buffer solution tank 110.

Specifically, a filter 311 is disposed between the waste liquid assembly 310 and the buffer liquid tank 110, one end of the filter 311 is connected to the third end of the connector 210 through a pipeline, and the other end of the filter 311 is connected to the waste liquid assembly 310 through a pipeline, so that the filter 311 can filter impurities in the buffer liquid overflowing from the buffer liquid tank 110. After the waste liquid component 310 collects the buffer liquid overflowing from the buffer liquid tank 110, the collected waste liquid can be further recycled.

In this embodiment, the first end of the connector 210 is connected to the buffer tank 110 through a pipeline, the second end of the connector 210 is connected to the outside air through a pipeline, the third end of the connector 210 is connected to the waste liquid assembly 310 through a pipeline after being connected to the filter 311, the buffer solution overflowing from the buffer tank 110 can enter the filter 311 through a pipeline, the overflowing buffer solution is collected by the waste liquid assembly 310 after being filtered by the filter 311, the overflowing buffer solution is prevented from dropping onto an instrument circuit in the sample analyzer, and the buffer solution overflowing from the buffer tank 110 is collected, which is convenient for subsequent recycling of the buffer solution.

Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a buffer assembly provided in the present application. In another embodiment, as shown in fig. 2, the buffer assembly 10 includes a first check valve 312, one end of the first check valve 312 is connected to the third end of the connector 210 through a pipeline, and the other end of the first check valve 312 is connected to the waste assembly 310 through a pipeline, for controlling the opening and closing of the pipeline of the waste assembly 310.

Specifically, be provided with first check valve 312 between the pipeline of waste liquid subassembly 310 and buffer solution jar 110, the one end of first check valve 312 is passed through the pipeline and is connected with the third end of connector 210, the other end of first check valve 312 passes through the pipeline and is connected with waste liquid subassembly 310, first check valve 312 includes water inlet and delivery port, and buffer solution only can flow to waste liquid subassembly 310 through the water inlet, and the buffer solution among the waste liquid subassembly 310 can't flow to buffer solution jar 110 from the delivery port.

In this embodiment, the first end of the connector 210 is connected to the buffer tank 110 through a pipeline, the second end of the connector 210 is connected to the outside air through a pipeline, the third end of the connector 210 is connected to the waste liquid module 310 through a pipeline after being connected to the first check valve 312, the buffer solution overflowing from the buffer tank 110 is collected by the waste liquid module 310, the buffer solution is prevented from dripping onto an instrument circuit in the sample analyzer, and the pipeline of the waste liquid module 310 can be controlled by controlling the opening and closing of the first check valve 312.

Optionally, in any of the above embodiments, the second end of the connection head 210 is connected to the air filter 410 of the sample analyzer through a pipeline, and the buffer tank 110 is connected to the air filter 410 through one end of the connection head 210 and then is communicated with the atmosphere to filter dust and impurities in the atmosphere, so that the buffer stored in the buffer tank 110 is not easily deteriorated.

Optionally, the waste assembly 310 includes a waste tank (not shown) for collecting buffer solution overflowing the buffer tank 110.

The waste solution tank of the waste solution module 310 may be located relatively far away from the instrument and circuit module, and collects buffer solution overflowing the buffer solution tank 110. In a specific embodiment, the bottom of the waste liquid tank may further comprise a collector, and the buffer liquid collected in the waste liquid tank may be discharged out of the sample analyzer through the collector under the action of gravity. The position and structure of the waste liquid tank may be other embodiments, and are not limited in detail herein.

Optionally, the buffer assembly 10 includes a second one-way valve 411, one end of the second one-way valve 411 is connected to the air filter 410 of the sample analyzer through a pipeline, and the other end of the second one-way valve 411 is connected to the buffer tank 110 through a pipeline.

Specifically, the buffer solution tank 110 is connected with the air filter 410 after being connected with the second check valve 411 through one end of the connector 210, the air filter 410 is communicated with the atmosphere, and the pipeline of the air filter 410 can be controlled by controlling the opening and closing of the second check valve 411, so that when the buffer solution of the buffer solution tank 110 is used by the related solution pipeline of the sample analyzer, the air pressure in the buffer solution tank 110 is balanced, and the buffer solution in the buffer solution tank 110 can be conveniently extracted by the related solution pipeline of the sample analyzer.

Alternatively, the buffer assembly 10 includes a first liquid pump 611, one end of the first liquid pump 611 is connected to the buffer tank 110 through a pipeline, and the other end of the first liquid pump 611 is connected to a buffer tank 510 located outside the sample analyzer through a pipeline.

The buffer solution assembly 10 includes a first liquid pump 611 and a second liquid pump 612, one end of the first liquid pump is connected to the buffer solution tank 110 through a pipeline, the other end of the first liquid pump is connected to the buffer solution barrel 510 located outside the sample analyzer through a pipeline, and the first liquid pump 611 can inject the buffer solution located in the buffer solution barrel 510 into the buffer solution tank 110 under the power action. One end of the second liquid pump 612 is connected with the buffer solution tank 110 through a pipeline, and the other end is connected with a related liquid pipeline of the sample analyzer through a pipeline, and the second liquid pump 612 can pump the buffer solution in the buffer solution tank 110 to the related liquid pipeline of the sample analyzer under the action of power. Specifically, the first and second liquid pumps 611 and 612 include, but are not limited to, diaphragm pumps.

Optionally, the buffer assembly 10 includes a controller (not shown) that is electrically connected to the first fluid pump 611.

Specifically, the controller is electrically connected to the first liquid pump 611 and the second liquid pump 612, and the controller is configured to control opening and closing of the first liquid pump 611 and the second liquid pump 612, so as to control the liquid level of the buffer solution in the buffer solution tank 110 within a preset range.

Further, the buffer solution assembly 10 includes a float sensor (not shown), which is electrically connected to the controller, and is disposed in the buffer solution tank 110 for monitoring the liquid level of the buffer solution tank 110, so that when the liquid level in the buffer solution tank 110 reaches a preset requirement, the controller controls the pipeline where the first liquid pump 611 is located to be turned on or off.

The float sensor disposed on the buffer tank 110 is electrically connected to the controller, and the controller can monitor the liquid level of the buffer tank 110 by acquiring the liquid level data transmitted from the float sensor. Specifically, the buffer tank 110 is provided with a first preset liquid level height and a second preset liquid level height, and the first preset liquid level height is greater than the second preset liquid level height.

When the controller judges that the liquid level height acquired by the float sensor is smaller than a second preset liquid level height, the controller controls the pipeline where the first liquid pump 611 is located to be communicated, and the first liquid pump 611 injects the buffer solution into the buffer solution tank 110; when the controller judges that the liquid level height acquired by the float sensor is greater than the first preset liquid level height, the controller controls the pipeline where the first liquid pump 611 is located to be closed, and the first liquid pump 611 stops filling the buffer solution.

Further, the float sensor is a two-stage float switch, the two-stage float switch is arranged in the buffer liquid tank 110, and the two-stage float switch is used for detecting the relation between the liquid level height and the two heights of the buffer liquid tank 110.

Specifically, the float sensor is provided with two sections of float switches, which are arranged in the buffer liquid tank 110, and each section of float switch includes a first float and a second float. The first float is used for detecting a relationship between the liquid level of the buffer tank 110 and a first preset liquid level, and when the liquid level detected by the first float is higher than the first preset liquid level, the controller controls the first liquid pump 611 to stop filling liquid. The second float is used for detecting the relationship between the liquid level of the buffer tank 110 and a second preset liquid level, and when the liquid level detected by the second float is lower than the second preset liquid level, the controller controls the second liquid pump 612 to fill liquid.

The present application further provides a sample analyzer, which includes the buffer solution assembly 10 and a reagent module (not shown in the figure) according to any of the above embodiments, where the reagent module is used to accommodate and prepare a reagent required for sample detection, and when the reagent of the reagent module is called to prepare a sample to be detected, the buffer solution of the buffer solution assembly 10 needs to be used for dilution, cleaning, and other operations, so in this embodiment, the other end of the second liquid pump of the buffer solution assembly 10 is connected to the reagent module through a pipeline, so as to draw the buffer solution in the buffer solution tank 110 through the second liquid pump when the buffer solution needs to be called.

Be different from prior art, the buffer solution subassembly 10 of this application is through setting up connector 210 at buffer solution jar 110, and the one end of connector 210 is passed through the pipeline and is connected with waste liquid subassembly 310, collects the buffer solution of buffer solution jar 110 overflow through using waste liquid subassembly 310, prevents that the buffer solution of overflow from dripping in the sample analysis appearance machine, prevents effectively that the interior emergence circuit of sample analysis appearance machine from damaging and the metal corrosion, improves sample analysis appearance's security and stability.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (11)

1. A buffer assembly of a sample analyzer, comprising:

the buffer liquid tank is used for storing the buffer liquid of the sample analyzer;

the first end of the connector is connected with the buffer liquid tank through a pipeline, and the second end of the connector is connected with external air through a pipeline;

the waste liquid assembly is connected with the third end of the connector through a pipeline and is used for collecting buffer liquid overflowing from the buffer liquid tank.

2. The buffer assembly of claim 1, wherein the buffer assembly comprises a filter, one end of the filter is connected to the third end of the connector through a pipeline, and the other end of the filter is connected to the waste liquid assembly through a pipeline, so as to filter the buffer solution overflowing from the buffer tank.

3. The buffer assembly of claim 1, wherein the buffer assembly comprises a first one-way valve, one end of the first one-way valve is connected to the third end of the connector through a pipeline, and the other end of the first one-way valve is connected to the waste liquid assembly through a pipeline.

4. Buffer assembly according to any of claims 1-3, wherein the second end of the connector is connected to an air filter of the sample analyzer via a tube.

5. The buffer assembly of claim 4, wherein the waste assembly comprises a waste tank for collecting buffer solution overflowing the buffer tank.

6. The buffer assembly of claim 5, comprising a second one-way valve, wherein one end of the second one-way valve is connected to the air filter of the sample analyzer via a pipeline, and the other end of the second one-way valve is connected to the buffer tank via a pipeline.

7. The buffer assembly of claim 6, comprising a first fluid pump, one end of the first fluid pump being connected to the buffer tank via a tube, and the other end of the first fluid pump being connected to a buffer tank located outside the sample analyzer via a tube.

8. The buffer assembly of claim 7, comprising a controller electrically connected to the first fluid pump.

9. The buffer solution assembly according to claim 8, wherein the buffer solution assembly comprises a float sensor, the float sensor is connected to the controller, and is disposed in the buffer solution tank for monitoring the liquid level in the buffer solution tank, so that when the liquid level in the buffer solution tank reaches a preset requirement, the controller controls the pipeline where the first liquid pump is located to be turned on or off.

10. The buffer assembly of claim 9, wherein the float sensor is a two-stage float switch disposed in the buffer tank for detecting a level of liquid in the buffer tank relative to the two levels.

11. A sample analyzer comprising the buffer assembly of any one of claims 1-10 and a reagent module, wherein the buffer assembly comprises a secondary fluid pump, one end of the secondary fluid pump is connected to the buffer tank by a pipeline, and the other end of the secondary fluid pump is connected to the reagent module by a pipeline.

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