Sample collection tube

Abstract

The utility model discloses a sample collecting tube and relates to the technical field of collecting devices. According to the main technical scheme, the filter device comprises a pipe fitting, a filter screen and a first end cover, wherein an opening is formed in one end of the pipe fitting; a material storage cavity is formed in the pipe fitting, and the material storage cavity is communicated with the opening; wherein the cross sectional area of the pipe fitting is gradually reduced in the direction from one end of the pipe fitting to the other end of the pipe fitting; the filter screen is arranged in the material storage cavity, a first material storage cavity element is formed between the side, away from the opening, of the filter screen and the cavity wall of the material storage cavity, and the first material storage cavity element is used for storing preserving fluid; a second material storage cavity element is formed between one side, close to the opening, of the filter screen and the cavity wall of the material storage cavity, and the second material storage cavity element is used for storing samples; the first end cover is connected to the opening in a sealed mode. The purposes of improving the stability of the pipe fitting in the standing process and reducing the accidental inclination risk are achieved. Meanwhile, the risk that mixed liquid of the sample and the preservation liquid leaks from the opening is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of collection devices, in particular to a sample collection tube. Background Art

[0002] A sample collection tube is a container used to collect, store and transport various biological samples (such as blood, saliva, urine, feces, tissue fragments, etc.). It is widely used in medical testing, scientific research experiments, disease diagnosis, gene sequencing and other fields.

[0003] In traditional sample collection tubes, mucus and particles in the mixed liquid clog the pipette tip during aspiration.

[0004] The prior art discloses an integrated stool sample collection device, including a storage tube and a sampling rod. The top of the storage tube is provided with a sample quantification hole, and the bottom is sealed. A filter membrane is provided inside the storage tube, and the top of the filter membrane is a mixing chamber, and the bottom of the filter membrane is a storage chamber. The sampling rod can be inserted into the mixing chamber through the sample quantification hole. The integrated stool sample collection device can allow the sample storage liquid in the storage chamber to pass through the filter membrane into the mixing chamber for mixing, so that the stool sample is dispersed in the sample storage liquid, and then the sample storage liquid in the mixing chamber passes through the filter membrane into the storage chamber, and the residue is trapped in the mixing chamber, thereby effectively separating the sample residue, facilitating the preparation of the storage liquid, and greatly simplifying the sample collection process.

[0005] During use, the integrated fecal sample collection device needs to invert the sampling tube, squeeze the storage cavity in the lower half of the sample storage tube, and flow the sample storage liquid at the bottom through the filter membrane into the mixing cavity inside. However, the integrated fecal sample collection device has a structure with the same outer diameter at the upper and lower ends, which greatly reduces the stability of the collection device during inversion. Utility Model Content

[0006] The utility model aims to provide a sample collection tube. When the tube is inverted on the surface of a workbench, the end of the tube with a larger cross-sectional area is attached to the surface of the workbench, thereby achieving the purpose of improving the stability of the tube during static placement and reducing the risk of accidental tilting.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A sample collection tube comprises a tube, a filter and a first end cap, wherein an opening is arranged at one end of the tube; a storage cavity is arranged inside the tube, and the storage cavity is communicated with the opening; wherein the cross-sectional area of ​​the tube gradually decreases from one end of the tube to the other end of the tube; the filter is arranged in the storage cavity, and a first storage cavity element is formed between a side of the filter away from the opening and a cavity wall of the storage cavity, and the first storage cavity element is used for storing a preservation liquid; a second storage cavity element is formed between a side of the filter close to the opening and the cavity wall of the storage cavity, and the second storage cavity element is used for storing a sample; the first end cap is sealed and connected to the opening.

[0009] A further solution is: the pipe fitting includes a first tube body and a second tube body; a receiving groove is provided at one end of the first tube body; the receiving groove extends along one end of the first tube body toward the other end of the first tube body; one end of the second tube body is detachably connected to the receiving groove, and the second tube body is sealed and connected to the groove wall of the receiving groove; a flow channel is provided inside the second tube body, the flow channel extends along one end of the second tube body toward the other end of the second tube body, and the flow channel is connected to the receiving groove; wherein the cross-sectional area of ​​the second tube body gradually decreases along the direction from the other end of the second tube body toward one end of the second tube body; the filter screen is arranged in the flow channel, and the first material storage cavity is formed between the side wall of the filter screen close to the bottom of the receiving groove, the groove wall of the receiving groove, and the bottom of the receiving groove; the second material storage cavity is formed between the side wall of the filter screen away from the bottom of the receiving groove and the side wall of the flow channel; the first end cover is arranged at one end of the flow channel away from the bottom of the receiving groove.

[0010] A further solution is: a first connecting groove is opened at the groove opening of the accommodating groove; the first connecting groove extends along the groove wall of the accommodating groove; one end of the second tube body is screwed into the first connecting groove, and the end face of one end of the second tube body is sealed and connected to the bottom of the first connecting groove.

[0011] A further solution is: a second connecting groove is provided at one end of the first end cover close to the flow channel; the other end of the second tube body is screwed into the second connecting groove, and the end surface of the other end of the second tube body is sealed and connected to the bottom of the second connecting groove.

[0012] A further solution is that a first anti-slip groove is provided on the outer wall of the first end cover.

[0013] A further solution is that: the sample collection tube further includes a second end cover; the second end cover is used to be screwed into the first connecting groove.

[0014] A further solution is: a third connecting groove is formed at one end of the second end cover; and the bottom of the third connecting groove is used for sealing connection with the end surface of one end of the first tube body.

[0015] A further solution is that a second anti-slip groove is provided on the outer wall of the second end cover.

[0016] A further solution is that the cross-sectional area of ​​the flow channel gradually decreases along the direction from the first end cover to the bottom of the accommodating groove.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] On the one hand, the preservation liquid is stored in the first storage cavity, and the first end cap is sealed and connected to the opening of the pipe, so as to ensure the sealing of the preservation liquid during transportation and storage, thereby reducing the risk of contamination and leakage of the preservation liquid.

[0019] On the other hand, when the pipe fitting is placed upside down on the workbench, the end of the pipe fitting with a larger cross-sectional area is attached to the workbench surface, thereby improving the stability of the pipe fitting during static placement and reducing the risk of accidental tilting.

[0020] On the other hand, the filter can filter mucus, particles, etc. in the sample liquid as the sample liquid flows through the filter, thereby reducing the risk of mucus, particles, etc. in the sample liquid clogging the pipette tip during pipetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic cross-sectional structural diagram of a sample collection tube in this embodiment when the second tube body is connected to the first tube body and the first end cover is connected to the second tube body;

[0022] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0023] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0024] Figure 4 This is a schematic cross-sectional structural diagram of a sample collection tube in this embodiment when the second tube body is connected to the first tube body and the first end cover is not connected to the second tube body;

[0025] Figure 5 This is a schematic cross-sectional structural diagram of a sample collection tube in this embodiment when the second end cap of the sample collection tube is connected to the first tube body;

[0026] Figure 6 for Figure 5 The enlarged structural diagram at C in the middle;

[0027] Figure 7 is a schematic cross-sectional structural diagram of a sample collection tube in this embodiment when the second end cap of the sample collection tube is not connected to the first tube body;

[0028] Figure 8 This is a schematic cross-sectional structural diagram of a second tube body for a sample collection tube in this embodiment;

[0029] Fig. 9 This is a schematic diagram of the cross-sectional structure of a sample collection tube in this embodiment when it is inside the first tube body.

[0030] Marks and corresponding parts names in the attached drawings:

[0031] 1-pipe fitting; 101-first pipe body; 102-second pipe body;

[0032] 2-opening; 3-storage cavity; 301-first storage cavity element; 302-second storage cavity element;

[0033] 4-filter screen; 5-first end cover; 6-accommodating groove; 7-flow channel; 8-first connecting groove; 9-second connecting groove; 10-first anti-skid groove; 11-second end cover; 12-third connecting groove; 13-second anti-skid groove. DETAILED DESCRIPTION

[0034] The utility model will be further described below in conjunction with the accompanying drawings.

[0035] Example 1

[0036] This embodiment provides a sample collection tube, such as Figure 1 As shown, it includes a pipe 1, a filter screen 4 and a first end cover 5, wherein an opening 2 is provided at one end of the pipe 1; a storage cavity 3 is provided inside the pipe 1, and the storage cavity 3 is communicated with the opening 2; wherein the cross-sectional area of ​​the pipe 1 gradually decreases along the direction from one end of the pipe 1 to the other end of the pipe 1; the filter screen 4 is arranged in the storage cavity 3, and a first storage cavity element 301 is formed between the side of the filter screen 4 away from the opening 2 and the cavity wall of the storage cavity 3, and the first storage cavity element 301 is used for storing preservation liquid; a second storage cavity element 302 is formed between the side of the filter screen 4 close to the opening 2 and the cavity wall of the storage cavity 3, and the second storage cavity element 302 is used for storing samples; the first end cover 5 is sealed and connected to the opening 2.

[0037] Exemplarily, during the implementation process, the cross-sectional area of ​​the pipe 1 gradually decreases from one end of the pipe 1 to the other end of the pipe 1. A liquid storage cavity is provided inside the pipe 1, and the liquid storage cavity extends from one end of the pipe 1 to the other end of the pipe 1. A filter screen 4 is provided on the cavity wall of the liquid storage cavity, and the filter screen 4 divides the liquid storage cavity into a first storage cavity element 301 and a second storage cavity element 302. Among them, the first storage cavity element 301 is located at the other end of the pipe 1, and the preservation liquid is stored in the first storage cavity element 301. The second storage cavity element 302 is located at one end of the pipe 1, and the second storage cavity element 302 is used to store samples. An opening 2 is provided at one end of the pipe 1, and the opening 2 is connected to the second storage cavity element 302. The first end cap 5 is connected to the opening 2 of the pipe 1 by a detachable connection method such as buckling and screwing, and the first end cap 5 is sealed and connected to the pipe 1 by a sealing ring, a sealing gasket, etc.

[0038] Before use, the preservation solution is stored in the first storage cavity 301, and the first end cap 5 is sealed and connected to the opening 2 of the tube 1, so as to ensure the sealing of the preservation solution during transportation and storage, thereby reducing the risk of contamination and leakage of the preservation solution.

[0039] When in use, the opening 2 of the pipe 1 is facing upwards, and the first end cap 5 is removed from the opening 2 of the pipe 1. Next, the sample is injected into the second material storage cavity 302 from the opening 2. After the sample injection is completed, the first end cap 5 is sealed and connected to the opening 2. Next, the pipe 1 is inverted on the surface of the workbench. At this time, the end of the pipe 1 with a larger cross-sectional area is attached to the surface of the workbench, so as to improve the stability of the pipe 1 during the static process and reduce the risk of accidental tilting.

[0040] During the inversion of the tube 1, the preservation liquid in the first storage chamber 301 can flow through the filter 4 and mix with the sample in the second storage chamber 302 to promote the liquefaction of the sample such as saliva or feces to form a sample liquid. At this time, the sealing connection between the first end cap 5 and the opening 2 can reduce the risk of the mixture of the sample and the preservation liquid leaking from the opening 2.

[0041] After the tube 1 is left to stand for a period of time, the sample such as saliva or stool is fully liquefied. At this time, the tube 1 is inverted again so that the opening 2 faces upward, so that the sample liquid can flow through the filter screen 4 and enter the first storage cavity 301. In the process of the sample liquid flowing through the filter screen 4, the filter screen 4 can filter the mucus, particles, etc. in the sample liquid, thereby achieving the purpose of reducing the risk of mucus, particles, etc. in the sample liquid clogging the pipette tip during aspiration.

[0042] Example 2

[0043] like Figure 1 Combination Fig. 9As shown, on the basis of Example 1, in this embodiment, the pipe fitting 1 includes a first pipe body 101 and a second pipe body 102; one end of the first pipe body 101 is provided with a receiving groove 6; the receiving groove 6 extends along one end of the first pipe body 101 toward the other end of the first pipe body 101; one end of the second pipe body 102 is detachably connected to the receiving groove 6, and the second pipe body 102 is sealedly connected to the groove wall of the receiving groove 6; a flow channel 7 is opened inside the second pipe body 102, and the flow channel 7 extends along one end of the second pipe body 102 toward the other end of the second pipe body 102, And the flow channel 7 is connected with the accommodating groove 6; wherein, the cross-sectional area of ​​the second tube body 102 gradually decreases along the direction from the other end of the second tube body 102 to one end of the second tube body 102; the filter screen 4 is arranged in the flow channel 7, and the first material storage cavity 301 is formed between the side wall of the filter screen 4 close to the bottom of the accommodating groove 6 and the groove wall of the accommodating groove 6 and the bottom of the accommodating groove 6; the second material storage cavity 302 is formed between the side wall of the filter screen 4 away from the bottom of the accommodating groove 6 and the side wall of the flow channel 7; the first end cover 5 is arranged at one end of the flow channel 7 away from the bottom of the accommodating groove 6.

[0044] Exemplarily, in the implementation process, the pipe 1 includes a first pipe body 101 and a second pipe body 102. The first pipe body 101 has a receiving groove 6 at one end, and the receiving groove 6 extends from one end of the second pipe body 102 to the other end of the second pipe body 102.

[0045] One end of the second tube body 102 is detachably connected to the receiving groove 6 by means of buckling, screw connection, etc., and the outer wall of the second tube body 102 is sealed and connected to the groove wall of the receiving groove 6 by means of sealing rings, sealing gaskets, etc. A flow channel 7 is provided inside the second tube body 102, and the flow channel 7 runs through both ends of the second tube body 102 and communicates with the receiving groove 6. The cross-sectional area of ​​the second tube body 102 gradually increases from one end of the second tube body 102 to the other end of the second tube body 102.

[0046] The filter screen 4 is installed in the flow channel 7 by welding, gluing, clamping, etc., so as to form a first material storage cavity 301 between the side wall of the filter screen 4 close to the bottom of the accommodating groove 6, the bottom of the accommodating groove 6 and the wall of the accommodating groove 6. At the same time, a second material storage cavity 302 is formed between the side wall of the filter screen 4 away from the bottom of the accommodating groove 6 and the side wall of the flow channel 7.

[0047] The first end cover 5 is fixed to the end of the flow channel 7 away from the bottom of the accommodating groove 6 by means of buckling, screwing, etc., and the first end cover 5 is sealed and connected to the groove wall of the flow channel 7 by means of sealing rings, sealing gaskets, etc.

[0048] Before use, remove the second tube body 102 and store the preservation solution in the receiving groove 6 on the first tube body 101. This facilitates the storage of the preservation solution in the receiving groove 6. Then, connect the second tube body 102 to the receiving groove 6 of the first tube body 101, and connect the first end cap 5 to the end of the flow channel 7 away from the bottom of the receiving groove 6, so that the first end cap 5 is sealed and connected to the groove wall of the flow channel 7. This ensures the sealing of the preservation solution during transportation and storage, thereby reducing the risk of contamination and leakage of the preservation solution.

[0049] When in use, the first end cap 5 is opened and the sample is injected into the flow channel 7. After the sample injection is completed, the first end cap 5 is sealed and connected to the flow channel 7. Then, the first tube body 101 and the second tube body 102 are inverted on the surface of the workbench. At this time, the end of the second tube body 102 with a larger cross-sectional area is attached to the surface of the workbench, so as to improve the stability of the tube 1 during the static process and reduce the risk of accidental tilting.

[0050] During the inversion of the first tube body 101 and the second tube body 102, the preservation liquid in the containing groove 6 can flow through the filter screen 4 and mix with the sample in the flow channel 7 to promote the liquefaction of the sample such as saliva or feces to form a sample liquid. At this time, the sealed connection between the first end cap 5 and the flow channel 7 can reduce the risk of the mixed liquid of the sample and the preservation liquid leaking from the opening 2.

[0051] After the first tube body 101 and the second tube body 102 are left to stand for a period of time, the sample such as saliva or stool is fully liquefied. At this time, the first tube body 101 and the second tube body 102 are inverted again, so that the notch of the receiving groove 6 faces upward, so that the sample liquid can flow through the filter screen 4 and enter the receiving groove 6. In the process of the sample liquid flowing through the filter screen 4, the filter screen 4 can filter the mucus, particles, etc. in the sample liquid, thereby achieving the purpose of reducing the risk of the mucus, particles, etc. in the sample liquid clogging the pipette tip during the aspiration.

[0052] When the sample liquid in the receiving tank 6 needs to be sucked by the suction head, the second tube 102 is first taken out from the receiving tank 6. Fig. 9 As shown. Then, the suction head is inserted into the receiving tank 6 from the notch of the receiving tank 6 to absorb the sample liquid. This makes it easy for the staff to absorb the sample liquid. At the same time, the second tube 102 is sealed and connected to the groove wall of the receiving tank 6 to ensure the sealing of the sample liquid or the preservation liquid during transportation and storage, thereby reducing the risk of contamination and leakage of the sample liquid or the preservation liquid.

[0053] Example 3

[0054] like Figure 1 Combination Figure 3As shown, on the basis of Example 2, in this embodiment, a first connecting groove 8 is opened at the groove opening of the accommodating groove 6; the first connecting groove 8 extends along the groove wall of the accommodating groove 6; one end of the second tube body 102 is screwed into the first connecting groove 8, and the end face of one end of the second tube body 102 is sealed and connected to the bottom of the first connecting groove 8.

[0055] Exemplarily, in the implementation process, the notch of the receiving groove 6 is provided with a first connecting groove 8, and the first connecting groove 8 extends along the groove wall of the receiving groove 6. An internal thread is provided on the groove wall of the first connecting groove 8, and an external thread is provided on the outer wall of the second tube body 102. The second tube body 102 is inserted into the first connecting groove 8, and the external thread on the second tube body 102 is screwed onto the internal thread of the groove wall of the first connecting groove 8. And the end face of one end of the second tube body 102 is sealed and connected to the bottom of the first connecting groove 8 by means of a sealing ring, a sealing gasket, etc. Through the double sealing of the threaded connection and the sealed connection, the purpose of further ensuring the sealing of the preservation liquid or the sample liquid during transportation and storage is achieved, thereby reducing the risk of contamination and leakage of the preservation liquid or the sample liquid.

[0056] Example 4

[0057] like Figure 1 Combination Figure 2 As shown, on the basis of Example 2, in this embodiment, a second connecting groove 9 is provided at one end of the first end cover 5 close to the flow channel 7; the other end of the second tube body 102 is screwed into the second connecting groove 9, and the end surface of the other end of the second tube body 102 is sealed and connected to the bottom of the second connecting groove 9.

[0058] Exemplarily, in the implementation process, the first end cap 5 is provided with a second connection groove 9 at one end close to the flow channel 7, an external thread is provided on the groove wall of the second connection groove 9, and an internal thread is provided in the flow channel 7. The first end cap 5 is inserted into the flow channel 7, and the external thread on the groove wall of the second connection groove 9 is screwed to the internal thread in the flow channel 7 on the second tube body 102. And the end surface of the other end of the second tube body 102 is connected to the groove bottom of the second connection groove 9 by means of a sealing ring, a sealing gasket, etc. The double sealing of the threaded connection and the sealed connection is achieved to further ensure the sealing of the preservation liquid or the sample liquid during the inversion process, thereby reducing the risk of contamination and leakage of the preservation liquid or the sample liquid.

[0059] Example 5

[0060] like Figure 4 As shown, on the basis of Example 4, in this embodiment, the outer wall of the first end cover 5 is provided with a first anti-slip groove 10.

[0061] Exemplarily, in the implementation process, a first anti-skid groove 10 is provided on the outer wall of the first end cap 5, and the first anti-skid groove 10 can be a straight line, a spiral line, a dot matrix or other geometric shapes that increase friction. The number of the first anti-skid grooves 10 is set to be several, and the several first anti-skid grooves 10 surround the first end cap 5. The purpose of improving the grip stability and operation convenience when holding the first end cap 5 is achieved.

[0062] Example 6

[0063] like Figure 5 As shown, on the basis of Example 3, in this embodiment, the sample collection tube further includes a second end cover 11 ; the second end cover 11 is used to be screwed into the first connecting groove 8 .

[0064] Exemplarily, in the implementation process, the sample collection tube further includes a second end cap 11, the outer wall of the second end cap 11 is provided with an external thread, and the external thread on the second end cap 11 is adapted to the internal thread in the first connection groove 8. When the second tube body 102 is not connected to the first tube body 101, the second end cap 11 can be screwed into the first connection groove 8 to ensure the sealing of the preservation liquid or sample liquid during transportation and storage, thereby reducing the risk of contamination and leakage of the preservation liquid or sample liquid.

[0065] Example 7

[0066] like Figure 6 As shown, based on Example 6, in this embodiment, a third connecting groove 12 is opened at one end of the second end cover 11; the bottom of the third connecting groove 12 is used for sealing connection with the end face of one end of the first tube body 101.

[0067] Exemplarily, in the implementation process, a third connecting groove 12 is provided at one end of the second end cap 11, and an external thread is provided on the groove wall of the third connecting groove 12. The second end cap 11 is inserted into the first connecting groove 8, and the external thread on the groove wall of the third connecting groove 12 is screwed to the internal thread on the first connecting groove 8, and the groove bottom of the third connecting groove 12 is sealed and connected to the end face of one end of the first tube body 101 by means of a sealing ring, a sealing gasket, etc. This further ensures the sealing of the preservation liquid or sample liquid during transportation and storage when the second end cap 11 is connected to the first connecting groove 8, thereby reducing the risk of contamination and leakage of the preservation liquid or sample liquid.

[0068] Example 8

[0069] like Figure 7 As shown, on the basis of Example 6 or Example 7, in this embodiment, the outer wall of the second end cover 11 is provided with a second anti-slip groove 13.

[0070] Exemplarily, in the implementation process, a second anti-skid groove 13 is provided on the outer wall of the second end cap 11, and the second anti-skid groove 13 can be a straight line, a spiral line, a dot matrix or other geometric shapes that increase friction. The number of the second anti-skid grooves 13 is set to be several, and the several second anti-skid grooves 13 are arranged around the second end cap 11. The purpose of improving the grip stability and operation convenience when holding the second end cap 11 is achieved.

[0071] Example 9

[0072] like Figure 8 As shown, based on Example 2, the cross-sectional area of ​​the flow channel 7 gradually decreases along the direction from the first end cover 5 to the bottom of the accommodating groove 6.

[0073] Exemplarily, during the implementation, the cross-sectional area of ​​the flow channel 7 gradually decreases along the direction from the first end cover 5 to the bottom of the receiving tank 6. As the cross-sectional area of ​​the flow channel 7 gradually decreases, the sample liquid will experience a natural acceleration process in the process of flowing to the receiving tank 6, thereby achieving the purpose of facilitating the sample liquid to smoothly pass through the filter screen 4 and finally gather in the receiving tank 6.

[0074] Although the utility model is described herein with reference to a plurality of illustrative embodiments of the utility model, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the disclosure, drawings, and claims of the present application, various modifications and improvements may be made to the components and / or layout of the subject combination layout. In addition to modifications and improvements to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A sample collection tube, characterized in that: include: A pipe fitting (1), wherein one end of the pipe fitting (1) is provided with an opening (2); a material storage cavity (3) is provided inside the pipe fitting (1), and the material storage cavity (3) is communicated with the opening (2); wherein the cross-sectional area of ​​the pipe fitting (1) gradually decreases in a direction from one end of the pipe fitting (1) to the other end of the pipe fitting (1); A filter screen (4), the filter screen (4) being arranged in the material storage cavity (3), a first material storage cavity element (301) being formed between a side of the filter screen (4) away from the opening (2) and a cavity wall of the material storage cavity (3), the first material storage cavity element (301) being used for storing a preservation solution; a second material storage cavity element (302) being formed between a side of the filter screen (4) close to the opening (2) and a cavity wall of the material storage cavity (3), the second material storage cavity element (302) being used for storing a sample; A first end cover (5), wherein the first end cover (5) is sealingly connected to the opening (2).

2. The sample collection tube according to claim 1, characterized in that: The pipe member (1) comprises a first pipe body (101) and a second pipe body (102); A receiving groove (6) is provided at one end of the first tube body (101); the receiving groove (6) extends along the direction from one end of the first tube body (101) to the other end of the first tube body (101); One end of the second tube body (102) is detachably connected to the containing groove (6), and the second tube body (102) is sealedly connected to the groove wall of the containing groove (6); a flow channel (7) is provided inside the second tube body (102), the flow channel (7) extends from one end of the second tube body (102) to the other end of the second tube body (102), and the flow channel (7) is connected to the containing groove (6); wherein the cross-sectional area of ​​the second tube body (102) gradually decreases from the other end of the second tube body (102) to one end of the second tube body (102); The filter screen (4) is arranged in the flow channel (7), and the first material storage cavity (301) is formed between the side wall of the filter screen (4) close to the bottom of the accommodating groove (6), the groove wall of the accommodating groove (6), and the groove bottom of the accommodating groove (6); the second material storage cavity (302) is formed between the side wall of the filter screen (4) away from the bottom of the accommodating groove (6) and the side wall of the flow channel (7); The first end cover (5) is arranged at an end of the flow channel (7) away from the bottom of the accommodating groove (6).

3. The sample collection tube according to claim 2, characterized in that: The notch of the accommodating groove (6) is provided with a first connecting groove (8); The first connecting groove (8) extends along the groove wall of the accommodating groove (6); The second tube body (102) is threadedly connected in the first connecting groove (8), and an end surface of one end of the second tube body (102) is sealingly connected to the bottom of the first connecting groove (8).

4. The sample collection tube according to claim 2, characterized in that: A second connecting groove (9) is provided at one end of the first end cover (5) close to the flow channel (7); The other end of the second tube body (102) is screwed into the second connecting groove (9), and the end surface of the other end of the second tube body (102) is sealingly connected to the bottom of the second connecting groove (9).

5. The sample collection tube according to claim 4, characterized in that: The outer wall of the first end cover (5) is provided with a first anti-slip groove (10).

6. The sample collection tube according to claim 3, characterized in that: Also includes a second end cover (11); The second end cover (11) is used for being screwed into the first connecting groove (8).

7. The sample collection tube according to claim 6, characterized in that: A third connecting groove (12) is formed at one end of the second end cover (11); The bottom of the third connecting groove (12) is used for sealing connection with the end surface of one end of the first tube body (101).

8. The sample collection tube according to claim 6 or 7, characterized in that: The outer wall of the second end cover (11) is provided with a second anti-slip groove (13).

9. The sample collection tube according to claim 2, characterized in that: The cross-sectional area of ​​the flow channel (7) gradually decreases in the direction from the first end cover (5) to the bottom of the accommodating groove (6).

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