CN218601124U - Rear sheath isolation chamber, counting assembly, counting device and blood analyzer - Google Patents

Abstract

The application provides a rear sheath isolation chamber, a counting assembly, a counting device and a blood analyzer, wherein a first liquid storage space, a first liquid inlet channel and a first liquid discharging channel are formed in the rear sheath isolation chamber, and the first liquid storage space is communicated with the first liquid inlet channel and the first liquid discharging channel respectively, so that a counting reagent is injected into the first liquid storage space from the first liquid inlet channel and is discharged from the first liquid discharging channel; the back sheath isolation chamber is further provided with an overflow channel, the overflow channel is communicated with the first liquid storage space, so that when the liquid level of the counting reagent in the first liquid storage space exceeds the preset height, the exceeded counting reagent can be discharged through the overflow channel, the liquid level in the back sheath isolation chamber is kept at the preset height, the phenomenon that the liquid level in the back sheath isolation chamber is unstable to generate bubbles is avoided, and the stability of particle counting is reduced.

Description

Rear sheath isolation chamber, counting assembly, counting device and blood analyzer

Technical Field

The application relates to the technical field of medical equipment, in particular to a rear sheath isolation chamber, a counting assembly, a counting device and a blood analyzer.

Background

The sheath flow impedance technique is a technique commonly used in blood analyzers, which detects the concentration of particles to be measured in a sample by forming an electric field in a counter and then counting the particles in the sample by the number of voltage difference fluctuations of the electric field.

Because factors such as the effect of electric field and pressure variation, reagent can produce the bubble in the counter, can influence the stability of particle count, and when concrete application, for the circuit of guaranteeing between the front sheath of counter and the back sheath by the pipeline short circuit of sheath liquid around, generally can keep apart back sheath through back sheath isolation chamber, consequently, in order to avoid producing the bubble in the back sheath isolation chamber for influence particle count's stability behind the bubble entering counter, need guarantee the liquid level stability in the back sheath isolation chamber.

SUMMERY OF THE UTILITY MODEL

This application mainly provides a back sheath isolation chamber, counting assembly and blood analysis appearance, can simplify belt cleaning device's structure, shortens the cleaning time.

In order to solve the technical problem, the application adopts a technical scheme that: providing a rear sheath isolation chamber for particle counting, wherein the rear sheath isolation chamber is provided with a first liquid storage space, a first liquid inlet channel and a first liquid outlet channel, and the first liquid storage space is respectively communicated with the first liquid inlet channel and the first liquid outlet channel to connect the first liquid storage space with the first liquid inlet channel, so that counting reagents are injected into the first liquid storage space from the first liquid inlet channel and are discharged from the first liquid outlet channel; wherein, the back sheath isolation chamber is also provided with an overflow channel which is communicated with the first liquid storage space.

In a specific embodiment, the first liquid inlet channel is close to one end of the first liquid storage space and is higher than one end of the overflow channel, which is close to the first liquid storage space.

In a specific embodiment, back sheath isolation chamber includes diapire, week lateral wall and top cap, the diapire with week lateral wall is connected, the top cap lid is located week lateral wall is in order to form first stock solution space, first inlet channel is formed at the top cap, first drainage channel is formed at the diapire, overflow channel is formed in week lateral wall or top cap.

In order to solve the above technical problem, another technical solution adopted by the present application is: the counting assembly comprises a counter, a first pipeline and the rear sheath isolation chamber, wherein the counter is used for counting particles of a sample, and the first pipeline is communicated with the first drainage channel and the counter respectively.

In a specific embodiment, the count subassembly still includes waste liquid isolation room and second pipeline, the waste liquid isolation room and be formed with second stock solution space, second inlet channel, second drainage channel, the second stock solution space respectively with second inlet channel reaches second drainage channel intercommunication, the second pipeline communicates respectively the counter reaches second inlet channel.

In a specific embodiment, the waste liquid isolation chamber is further formed with an exhaust passage, and the exhaust passage is communicated with the second liquid storage space.

In a specific embodiment, the first pipeline includes that first person in charge, second person in charge, sheath liquid pipe and back sheath scavenge pipe, the one end of first person in charge with first drainage channel intercommunication, the other end of first person in charge communicates respectively the sheath liquid pipe reaches back sheath scavenge pipe, the one end of second person in charge communicates respectively the sheath liquid pipe reaches back sheath scavenge pipe, the other end of second person in charge with the counter intercommunication, the pipe diameter of sheath liquid pipe is less than the pipe diameter of back sheath scavenge pipe, just the intercommunication has the washing to press the stop valve on the back sheath scavenge pipe.

In order to solve the above technical problem, the present application adopts another technical solution: the utility model provides a counting assembly, counting assembly includes sheath filling tube, back sheath filling tube and foretell count subassembly, sheath filling tube with the counter intercommunication, back sheath filling tube with first feed liquor channel intercommunication.

In a specific embodiment, the counting device further includes a power element and an air injection pipe, the air injection pipe is communicated with the rear sheath liquid feeding pipe, and the power element is communicated with the air injection pipe to inject air into the first liquid storage space through the air injection pipe, so that the counting reagent in the first liquid storage space is discharged from the first liquid discharge channel to the counter under the positive pressure effect.

In order to solve the above technical problem, the present application adopts another technical solution that: there is provided a cell analyzer comprising the counting device described above.

The beneficial effect of this application is: different from the situation of the prior art, the rear sheath isolation chamber for particle counting provided by the embodiment of the application is formed with a first liquid storage space, a first liquid inlet channel and a first liquid discharge channel, wherein the first liquid storage space is communicated with the first liquid inlet channel and the first liquid discharge channel respectively to enable counting reagent to be injected into the first liquid storage space from the first liquid inlet channel and to be discharged from the first liquid discharge channel; the rear sheath isolation chamber is also provided with an overflow channel, the overflow channel is communicated with the first liquid storage space, so that when the liquid level of the counting reagent in the first liquid storage space exceeds the preset height, the exceeded counting reagent can be discharged through the overflow channel, the liquid level in the rear sheath isolation chamber is kept at the preset height, the phenomenon that bubbles are generated due to unstable liquid level in the rear sheath isolation chamber is avoided, and the stability of particle counting is reduced.

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 will be 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 without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of a back sheath isolation chamber for particle counting as provided herein;

FIG. 2 is a schematic illustration of the location of another embodiment of the overflow channel of FIG. 1;

FIG. 3 is a schematic diagram of an embodiment of a counting assembly provided herein;

fig. 4 is a schematic diagram of an embodiment of a counting device provided in the present application.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings and embodiments. In particular, the following embodiments are merely illustrative of the present application, and do not limit the scope of the present application. Likewise, the following embodiments are only some embodiments of the present application, not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of this application, "plurality" means at least two, in a manner such as two, three, etc., unless specifically limited otherwise. All directional indications (such as up, down, left, right, front, and back … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. A process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the listed 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a rear sheath isolation chamber 10 for particle counting according to the present application, in which the rear sheath isolation chamber 10 is formed with a first liquid storage space 101, a first liquid inlet channel 102 and a first liquid outlet channel 103.

The first liquid storage space 101 is respectively communicated with the first liquid inlet channel 102 and the first liquid outlet channel 103, so that the counting reagent is injected into the first liquid storage space 101 from the first liquid inlet channel 102 and is discharged from the first liquid outlet channel 103.

Specifically, in practical application, the counting reagent may be a sheath fluid or a cleaning fluid, and the sheath fluid and/or the cleaning fluid are injected into the first liquid storage space 101 through the first liquid inlet channel 102 and then discharged from the first liquid discharge channel 103.

It can be understood that the number of the first inlet channel 102 and the first discharging channel 103 may be one or more, for example, the first inlet channel 102 and the first discharging channel 103 are one, the sheath fluid and the cleaning fluid can be injected into the first liquid storage space 101 through the first inlet channel 102 and discharged from the first discharging channel 103, for example, the first inlet channel 102 and the first discharging channel 103 are two, and the sheath fluid and the cleaning fluid are injected into the first liquid storage space 101 from the two first inlet channels 102 and discharged from the two first discharging channels 103.

Further, the rear sheath isolation chamber 10 is further formed with an overflow channel 104, and the overflow channel 104 is communicated with the first liquid storage space 101, so that when the liquid level of the counting reagent in the first liquid storage space 101 exceeds a preset height, the exceeded counting reagent can be discharged through the overflow channel 104, so that the liquid level in the rear sheath isolation chamber 10 is kept at the preset height, the phenomenon that the liquid level in the rear sheath isolation chamber 10 is unstable and generates bubbles is avoided, and the stability of particle counting is reduced.

In the present embodiment, the end of the first liquid inlet channel 102 close to the first liquid storage space 101 is higher than the end of the overflow channel 104 close to the first liquid storage space 102, that is, as shown in fig. 1, the end a of the first liquid inlet channel 102 is higher than the end B of the overflow channel 104 in the vertical direction Z, and this arrangement can prevent the first liquid injection port 102 from generating bubbles when the first liquid inlet channel 102 injects the counting reagent into the first liquid storage space 101.

Referring to fig. 1 and 2 together, fig. 2 is a schematic position diagram of another embodiment of the overflow channel 104 in fig. 1, wherein the rear sheath isolation chamber 10 includes a bottom wall 11, a peripheral side wall 12 and a top cover 13, the peripheral side wall 12 is connected to the bottom wall 11, the top cover 13 is covered on the peripheral side wall 12 to form the first liquid storage space 101, the first liquid inlet channel 102 is formed on the top cover 13, the first liquid outlet channel 103 is formed on the bottom wall 11, and the overflow channel 104 is formed on the peripheral side wall 12 shown in fig. 2 or the top cover 13 shown in fig. 1.

Referring to fig. 3, fig. 3 is a schematic diagram of a counting assembly 20 according to an embodiment of the present disclosure, in which the counting assembly 20 includes a counter 21, a first pipeline 22, and the rear sheath isolation chamber 10 according to the above embodiment.

Wherein the counter 21 is used for counting particles of the sample.

The counter 21 includes a front sheath 211 and a rear sheath 212, the front sheath 211 having a front sheath inlet 201 and a front sheath cleaning solution inlet 202 formed therein, and the rear sheath 212 having a rear sheath inlet 203 and a waste liquid outlet 204 formed therein.

The first pipe 22 communicates with the first drain passage 103 and the counter 21, respectively, and in the present embodiment, the first pipe 22 communicates with the first drain passage 103 and the rear sheath inlet 203 of the counter 21, respectively.

The first pipe 22 includes a first main pipe 221, a second main pipe 222, a sheath liquid pipe 223, and a rear sheath cleaning pipe 224, one end of the first main pipe 221 is communicated with the first drainage channel 103, the other end of the first main pipe 221 is communicated with the sheath liquid pipe 223 and the rear sheath cleaning pipe 224, one end of the second main pipe 222 is communicated with the sheath liquid pipe 223 and the rear sheath cleaning pipe 224, and the other end of the second main pipe 222 is communicated with the counter 21.

Furthermore, the diameter of the sheath fluid pipe 223 is smaller than that of the back sheath cleaning pipe 224, and the back sheath cleaning pipe 224 is communicated with a cleaning snap valve 2241.

Specifically, when the sheath liquid is injected from the rear sheath isolation chamber 10 into the rear sheath 212 of the counter 21, the injection amount of the sheath liquid cannot be excessively large in order to maintain the stability of the particle count in the counter 21, and therefore, the sheath liquid pipe 223 needs to select a pipe having a small pipe diameter, and when the cleaning liquid is injected from the rear sheath isolation chamber 10 into the rear sheath 212 of the counter 21, the injection amount of the cleaning liquid cannot be excessively small in order to enhance the cleaning effect, and therefore, the rear sheath cleaning pipe 224 needs to select a pipe having a large pipe diameter, and at the same time, when the sheath liquid is injected from the rear sheath isolation chamber 10 into the rear sheath 212 of the counter 21, the cleaning shut-off valve 2241 closes the cleaning pipe 224 to make the cleaning pipe 224 in a non-conducting state, at which time, the sheath liquid can only be injected from the sheath liquid pipe 223 into the rear sheath 212 of the counter 21, and when the cleaning liquid is injected from the rear sheath isolation chamber 10 into the rear sheath 212 of the counter 21, the cleaning shut-off valve 2241 opens the cleaning pipe 224 to make the cleaning pipe 224 in a conducting state, at which the cleaning liquid can be injected from the cleaning pipe 224 into the rear sheath 212 of the counter 21.

Further, in this embodiment, the counting assembly 20 further includes a waste liquid isolating chamber 23 and a second pipeline 24, the waste liquid isolating chamber 23 forms a second liquid storage space 205, a second liquid inlet channel 206, and a second liquid discharging channel 207, the second liquid storage space 205 is respectively communicated with the second liquid inlet channel 206 and the second liquid discharging channel 207, the second pipeline 24 is respectively communicated with the counter 21 and the second liquid inlet channel 206, in this embodiment, the second pipeline 24 is also respectively communicated with the waste liquid inlet 204 and the second liquid inlet channel 206, so that waste liquid generated in the rear sheath 212 of the counter 21 is sequentially injected into the second liquid storage space 205 of the waste liquid isolating chamber 23 through the waste liquid inlet 204 and the second liquid inlet channel 206, and is discharged from the second liquid discharging channel 206.

The waste liquid isolation chamber 23 is further formed with an exhaust channel 208, and the exhaust channel 208 is communicated with the second liquid storage space 205 to balance the air pressure of the second liquid storage space 205, that is, balance the internal and external atmospheric pressures of the waste liquid isolation chamber 23.

Wherein, the second pipeline 24 is communicated with a waste liquid pressure-break valve 241, that is, when waste liquid in the counter 21 needs to be discharged, the waste liquid pressure-break valve 241 opens the second pipeline 24, so that the second pipeline 24 is in a conducting state, and when waste liquid in the counter 21 does not need to be discharged, the waste liquid pressure-break valve 241 closes the second pipeline 24, so that the second pipeline 24 is in a non-conducting state.

Furthermore, in the present embodiment, the counting assembly 20 further includes a shielding cover 25, and the counter 21, the rear sheath isolation chamber 10, and the waste liquid isolation chamber 23 are all disposed in the shielding cover 25 to shield the influence of the external signal on the measurement signal of the counter 21.

The cleaning pressure-break valve 2241 and the waste liquid pressure-break valve 241 can avoid the influence on the measurement signal of the counter 21 when the electromagnetic valve is selected, and the shielding effect of the shielding case 25 is improved.

Referring to fig. 4, fig. 4 is a schematic diagram of an embodiment of a counting device 30 provided in the present application, wherein the counting device 30 in the present embodiment includes a front sheath filler tube 31, a rear sheath filler tube 32, and the counting assembly 20 in the above embodiment.

In the embodiment, the front sheath liquid feeding tube 31 is communicated with the counter 21, that is, the front sheath liquid feeding tube 31 is communicated with the front sheath inlet 201 of the counter 21 to feed the front sheath liquid into the front sheath 211 of the counter 21 through the front sheath liquid feeding tube 31, and the rear sheath liquid feeding tube 32 is communicated with the first liquid feeding channel 102 to feed the rear sheath liquid into the rear sheath isolation chamber 10 through the rear sheath liquid feeding tube 32.

It will be appreciated that in this embodiment, the rear sheath isolation chamber 10 isolates the rear sheath 212 of the counter 21 from the rear sheath barrel 32, thereby preventing the electrical circuit between the front sheath 211 and the rear sheath 212 of the counter 21 from being shorted by the front sheath barrel 31 and the rear sheath barrel 32.

Wherein, the front sheath liquid feeding tube 31 is communicated with a front sheath control element 311, when front sheath liquid feeding tube 31 is needed to be injected into the front sheath 211 through the front sheath liquid feeding tube 31, the front sheath control element 311 opens the front sheath liquid feeding tube 31 to enable the front sheath liquid feeding tube 31 to be in a conduction state, otherwise, the front sheath control element 311 closes the front sheath liquid feeding tube 31 to enable the front sheath liquid feeding tube 31 to be in a non-conduction state, the rear sheath liquid feeding tube 32 is communicated with a rear sheath control element 321, the function and principle of which are the same as those of the front sheath control element 311, and the description is omitted.

Further, the counting device 30 in this embodiment further includes a liquid storage container 33, the liquid storage container 33 is respectively communicated with the front sheath liquid feeding tube 31 and the rear sheath liquid feeding tube 32, so that the front sheath liquid feeding tube 31 extracts the front sheath liquid from the liquid storage container 33, and the rear sheath liquid feeding tube 32 extracts the rear sheath liquid and the cleaning liquid from the liquid storage container 33, that is, in this embodiment, the front sheath liquid, the rear sheath liquid and the cleaning liquid are all provided by the same liquid storage container 33, it can be understood that in other embodiments, the front sheath liquid, the rear sheath liquid and the cleaning liquid may also be provided by different liquid storage containers 33, for example, the three liquid storage containers 33 respectively provide the front sheath liquid, the rear sheath liquid and the cleaning liquid.

Further, counting assembly 30 in this embodiment still includes power component 34 and gas injection pipe 35, gas injection pipe 35 and back sheath filling tube 32 intercommunication, power component 34 and gas injection pipe 35 intercommunication are in order to inject the gas through gas injection pipe 35 in to first stock solution space 101, so that the counting reagent in first stock solution space 101 discharges to counter 21 from first drainage channel 103 under the positive pressure effect, through this kind of power mode, make counting reagent can discharge to counter 21 from back sheath isolation chamber 10 under the constant voltage effect, when counting reagent is sheath liquid, can make the stable back sheath isolation chamber 10 of sheath liquid discharge to counter 21, avoid producing the bubble, when counting reagent is the washing liquid, can form quick washing, improve cleaning performance and cleaning efficiency.

Wherein, the gas injection control component 351 is communicated with the gas injection pipe 35, and when the power component 34 is required to inject gas into the first liquid storage space 101 through the gas injection pipe 35, the gas injection control component 351 opens the gas injection pipe 35, so that the gas injection pipe 35 is in a conduction state, otherwise, the gas injection control component 351 closes the gas injection pipe 35, so that the gas injection pipe 35 is in a non-conduction state.

Further, the counting device 30 in the present embodiment further includes a first waste liquid assembly 36, and the first waste liquid assembly 36 is communicated with the overflow channel 104 to discharge the counting reagent flowing out from the overflow channel 104.

Specifically, the first waste liquid assembly 36 includes a first waste liquid pipe 361 and a first waste liquid container 362, and the first waste liquid pipe 361 is respectively communicated with the overflow channel 104 and the first waste liquid container 362, so that the counting reagent flowing out of the overflow channel 104 is discharged to the first waste liquid container 362 through the first waste liquid pipe 361.

The first waste liquid control element 3611 is connected to the first waste liquid pipe 361, and when the counting reagent flowing out from the overflow channel 104 needs to be discharged, the first waste liquid control element 3611 opens the first waste liquid pipe 361, so that the first waste liquid pipe 361 is in a conducting state, and conversely, the first waste liquid pipe 361 is in a non-conducting state.

Further, the counting device 30 of the present embodiment further includes a second waste liquid assembly 37, and the second waste liquid assembly 37 is communicated with the second liquid discharge channel 207 to discharge the waste liquid in the waste liquid isolation chamber 23.

Specifically, the second waste liquid assembly 37 includes a second waste liquid tube 371 and a second waste liquid container 372, and the second waste liquid tube 371 is respectively connected to the second liquid discharge channel 207 and the second waste liquid container 372, so that the waste liquid in the waste liquid isolation chamber 23 is discharged to the second waste liquid container 372 through the second waste liquid tube 37.

The second waste liquid control element 3711 is connected to the second waste liquid tube 371, and when the waste liquid in the waste liquid isolation chamber 23 needs to be discharged, the second waste liquid control element 3711 opens the second waste liquid tube 371 to make the second waste liquid tube 371 in a conducting state, or vice versa, to make the second waste liquid tube 371 in a non-conducting state.

Further, the counting apparatus 30 according to the present embodiment further includes an anterior sheath cleaning tube 38, and the anterior sheath cleaning tube 38 communicates with the anterior sheath cleaning liquid inlet 202 to inject a cleaning liquid into the anterior sheath 211 of the counter 21, thereby cleaning the anterior sheath 211.

In the present embodiment, the front sheath cleaning tube 38 communicates with the reservoir 33 to draw the cleaning liquid from the reservoir 33.

The front sheath cleaning tube 38 is connected to a cleaning control unit 381, and when a cleaning liquid needs to be injected into the front sheath 211 of the counter 21 through the front sheath cleaning tube 38, the cleaning control unit 381 opens the front sheath cleaning tube 38 to make the front sheath cleaning tube 38 in a conducting state, and conversely, makes the front sheath cleaning tube 38 in a non-conducting state.

Further, the counting apparatus 30 according to the present embodiment further includes a front sheath waste liquid pipe 39, and the front sheath waste liquid pipe 39 communicates with the front sheath liquid feeding pipe 31 so that the waste liquid after the cleaning of the front sheath 211 is discharged through the front sheath waste liquid pipe 39, and in the present embodiment, the front sheath waste liquid pipe 39 further communicates with the second waste liquid container 372 so that the waste liquid after the cleaning of the front sheath 211 is discharged through the front sheath waste liquid pipe 39 to the second waste liquid container 372.

The front sheath waste liquid pipe 39 is connected to a third waste liquid control element 391, which has the same principle and function as the second waste liquid control element 3711, and will not be described again.

Further, the counting device 30 of the present embodiment further includes a sampling component 310, and the sampling component 310 is used for extracting the sample from the sample container 320 and injecting the sample into the front sheath 211 of the counter 21, so that the counter 21 counts the particles of the sample.

The present embodiment also provides a blood analyzer including the counting device 30 of the above embodiment.

Different from the situation of the prior art, the rear sheath isolation chamber for particle counting provided by the embodiment of the application is formed with a first liquid storage space, a first liquid inlet channel and a first liquid discharge channel, wherein the first liquid storage space is communicated with the first liquid inlet channel and the first liquid discharge channel respectively to enable counting reagent to be injected into the first liquid storage space from the first liquid inlet channel and to be discharged from the first liquid discharge channel; the rear sheath isolation chamber is further provided with an overflow channel, the overflow channel is communicated with the first liquid storage space, so that when the liquid level of the counting reagent in the first liquid storage space exceeds a preset height, the exceeded counting reagent can be discharged through the overflow channel, the liquid level in the rear sheath isolation chamber is kept at the preset height, the phenomenon that bubbles are generated due to the unstable liquid level in the rear sheath isolation chamber is avoided, and the stability of particle counting is reduced.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are all included in the scope of the present application.

Claims (10)

1. A back sheath isolation chamber for particle counting, wherein the back sheath isolation chamber is formed with a first reservoir space, a first inlet channel, and a first outlet channel, the first reservoir space being in communication with the first inlet channel and the first outlet channel, respectively, such that counting reagent is injected into the first reservoir space from the first inlet channel and is discharged from the first outlet channel;

wherein, the back sheath isolation chamber is also provided with an overflow channel which is communicated with the first liquid storage space.

2. The back sheath isolator of claim 1, wherein the first inlet channel is positioned closer to an end of the first reservoir space than the overflow channel is positioned closer to the end of the first reservoir space.

3. The rear sheath isolation chamber according to claim 2, wherein the rear sheath isolation chamber comprises a bottom wall, a peripheral side wall, and a top cover, the bottom wall is connected to the peripheral side wall, the top cover is covered on the peripheral side wall to form the first liquid storage space, the first liquid inlet passage is formed in the top cover, the first liquid outlet passage is formed in the bottom wall, and the overflow passage is formed in the peripheral side wall or the top cover.

4. A counting assembly, comprising a counter for counting particles in a sample, a first conduit and the back sheath isolation chamber according to any one of claims 1 to 3, wherein the first conduit is connected to the first drainage channel and the counter, respectively.

5. The counting assembly according to claim 4, further comprising a waste liquid isolation chamber and a second pipeline, wherein the waste liquid isolation chamber is formed with a second liquid storage space, a second liquid inlet channel and a second liquid outlet channel, the second liquid storage space is respectively communicated with the second liquid inlet channel and the second liquid outlet channel, and the second pipeline is respectively communicated with the counter and the second liquid inlet channel.

6. The counting assembly of claim 5, wherein the waste isolation chamber is further formed with an exhaust passage communicating with the second fluid storage space.

7. The counting assembly according to claim 4, wherein the first pipeline comprises a first main pipe, a second main pipe, a sheath liquid pipe and a rear sheath cleaning pipe, one end of the first main pipe is communicated with the first liquid discharging channel, the other end of the first main pipe is communicated with the sheath liquid pipe and the rear sheath cleaning pipe, one end of the second main pipe is communicated with the sheath liquid pipe and the rear sheath cleaning pipe, the other end of the second main pipe is communicated with the counter, the diameter of the sheath liquid pipe is smaller than that of the rear sheath cleaning pipe, and a cleaning pressure-breaking valve is communicated with the rear sheath cleaning pipe.

8. A counting device, characterized in that, the counting device includes a front sheath filling tube, a back sheath filling tube and the counting assembly of any one of claims 4-7, the front sheath filling tube is communicated with the counter, and the back sheath filling tube is communicated with the first liquid inlet channel.

9. The counting device of claim 8, further comprising a power element and an air injection tube, wherein the air injection tube is in communication with the rear sheath filler tube, and the power element is in communication with the air injection tube to inject air into the first reservoir space through the air injection tube, so that the counting reagent in the first reservoir space is discharged from the first discharge channel to the counter under positive pressure.

10. A blood analyzer, characterized in that it comprises a counting device according to any one of claims 8 to 9.

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