Sampling tube

Abstract

The utility model discloses a sampling tube. The sampling tube comprises a tube body, a tube cover and a sealing gasket, the tube body is provided with a containing cavity with a top opening; the tube cover can be spirally and hermetically connected with the tube body; the straw cover comprises a cover body and a straw, a sealing gasket is arranged in the cover body, and the top face of the sealing gasket faces a top opening of the cover body. The suction pipe is provided with a hollow pipe cavity; the sealing gasket downwards seals the pipe cavity; the suction tube enables a small amount of liquid in the containing cavity to be easily sucked by the needle tube, and the length of a needle head of the needle tube does not need to be specially set.

Description

Technical Field

[0001] The present application belongs to the field of PCR detection technology, and specifically relates to a sampling tube. Background Art

[0002] A sampling tube is used in the PCR (Polymerase Chain Reaction) detection process, and the inside of the sampling tube where the sealing cover needs to be opened (for example: to insert a swab) is non-vacuum. After the sampling tube is sealed, it is necessary to pierce the sealing layer with a needle tube to extract the liquid inside. If most of the inside of the sampling tube is occupied by liquid and only a small amount of gas is retained, when the liquid is partially extracted, the air pressure inside the sampling tube decreases sharply, and the pressure difference between the inside and outside is too large, which will cause difficulty in suction. In order to ensure smooth suction, the sealed sampling tube recorded in the CN217677507U patent needs to retain more gas inside the sampling tube, that is, the liquid can only occupy a small part of the volume of the sampling tube. At this time, the length of the needle inserted into the sampling tube must be adapted to the length of the sampling tube so that the needle can be extended to the bottom of the sampling tube to absorb the liquid placed at the bottom. However, in some cases, the length of the needle inserted into the sampling tube cannot match the length of the sampling tube. For example, in order to adapt to the requirements of compact structure and small height of the POCT reagent kit, the needle of the syringe cannot be made long enough. How to balance the air pressure inside and outside the sampling tube and solve the problem of smooth suction under sealed conditions become technical problems that need to be solved by the utility model. Summary of the invention

[0003] In view of the above-mentioned shortcomings or deficiencies of the prior art, the technical problem to be solved by the present application is to provide a sampling tube that can easily draw a small amount of liquid in the tube even with an ordinary needle tube.

[0004] To solve the above technical problems, this application is implemented through the following technical solutions:

[0005] The present application proposes a sampling tube, comprising: a tube body, a tube cover and a sealing gasket; the tube body has a accommodating cavity with a top opening; the tube cover can be spirally sealed and connected to the tube body; the tube cover comprises a cover body and a straw, a sealing gasket is arranged in the cover body, and the top surface of the sealing gasket faces the top opening of the cover body, so that the needle can pierce the sealing gasket through the top opening of the cover body; the straw has a hollow tube cavity, and the sealing gasket seals the tube cavity downward.

[0006] Optionally, in the above-mentioned sampling tube, the sealing gasket is made of a self-resilient sealing elastic material.

[0007] Optionally, in the above-mentioned sampling tube, the tube cavity, the sealing gasket and the accommodating cavity have a common central axis.

[0008] Optionally, in the above-mentioned sampling tube, the lumen of the suction tube is an inverted cone.

[0009] Optionally, in the above-mentioned sampling tube, the maximum inner diameter of the tube cavity of the suction tube does not exceed 50% of the inner diameter of the accommodating cavity.

[0010] Optionally, in the above-mentioned sampling tube, the cover body has an external threaded portion, and the tube body has an internal threaded portion, and the external threaded portion and the internal threaded portion are screwed together to seal the accommodating cavity.

[0011] Optionally, in the above-mentioned sampling tube, a sealing film is provided inside the cover body and below the sealing gasket, and the sealing film is a PP material film or an aluminum-plastic film.

[0012] Optionally, in the above-mentioned sampling tube, the lower end of the suction tube extends into the lower part of the accommodating cavity.

[0013] Optionally, in the above-mentioned sampling tube, the straw is made of PP material.

[0014] Optionally, in the above-mentioned sampling tube, the straw and the cover body are integrally formed.

[0015] Compared with the prior art, this application has the following technical effects:

[0016] The present application sets a straw in the sampling tube, and the lower end of the straw is set close to the bottom of the accommodating cavity, so that the liquid level of the liquid at the bottom of the accommodating cavity is easily higher than the lower end opening of the straw. When it is necessary to use a needle tube to extract the liquid at the bottom of the accommodating cavity of the sampling tube, the needle only needs to pierce the sealing pad and enter the straw to start the suction operation without extending into the bottom of the accommodating cavity of the sampling tube. At the beginning, the needle tube first draws away the gas in the straw. As the gas in the straw decreases, the air pressure decreases, and the liquid at the bottom of the accommodating cavity is squeezed into the straw, so that the liquid level in the straw rises, and the needle tube can easily extract the liquid at the bottom of the accommodating cavity without special consideration of the needle length design. It saves costs, is easy to operate, ensures smooth liquid suction under sealed conditions, and is highly compatible with various PCR detection processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 : A three-dimensional diagram of a sampling tube according to an embodiment of the present application;

[0019] Figure 2 : A cross-sectional view of a sampling tube according to an embodiment of the present application;

[0020] Figure 3 : A schematic diagram of a sampling tube before liquid is taken out according to an embodiment of the present application;

[0021] Figure 4: Schematic diagram of a sampling tube when liquid is being taken according to one embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] like Figures 1 to 4 As shown, in one of the embodiments of the present application, a sampling tube includes: a tube body 1, a tube cover 2 and a sealing gasket 3; the tube body 1 has a accommodating cavity 11 with a top opening; the tube cover 2 can be spirally sealed and connected to the tube body 1; the tube cover 2 includes a cover body 21 and a straw 22, and the cover body is provided with a sealing gasket 3, and the top surface of the sealing gasket 3 faces the top opening of the cover body 21, so that the needle can pierce the sealing gasket through the top opening of the cover body 21; the straw 22 has a hollow tube cavity 23, and the sealing gasket 3 seals the tube cavity 23 downward.

[0024] The accommodating cavity 11 of the tube body 1 can be used for the sealed storage of virus preservation liquid and sampling swabs, etc. In the present embodiment, an internal threaded portion 12 which is matched and connected with the tube cover 2 is provided at a position near the top of the inner wall of the tube body 1. The internal threaded portion 12 cooperates with the external threaded portion 24 provided on the outer wall of the cover body 21 to tighten and seal the accommodating cavity 11, thereby reducing the overall volume while ensuring the volume of the sampling tube. It is known to those skilled in the art that, when the volume of the sampling tube does not need to be considered, in other embodiments, an external threaded portion may be provided on the outer wall of the tube body 1 near the top, and an internal threaded portion may be provided on the inner wall of the cover body 21, so that the two cooperate with each other to achieve the same tightening effect.

[0025] like Figure 3 As shown, the arrangement of the straw 22 makes the liquid level at the bottom of the accommodating chamber 11 exceed the lower opening of the straw 22 under normal circumstances. When it is necessary to use a needle to extract the liquid at the bottom of the sampling accommodating chamber, the needle first pierces the sealing pad 3 to enter the straw and absorb the gas in the straw. As the gas in the straw decreases, the air pressure decreases, and the liquid at the bottom of the accommodating chamber 11 is squeezed into the straw 22, so that the liquid level in the straw 22 is greatly increased. Figure 4 As shown, the needle tube can easily draw the liquid at the bottom of the holding chamber without the need to set a special length for the needle tip of the needle tube, thereby ensuring smooth liquid suction under sealed conditions and being highly compatible with various PCR detection processes.

[0026] The sealing gasket 3 is made of a self-rebounding elastic material, such as TPE, silicone, rubber, etc., so that after the needle pierces the sealing gasket 3 and is pulled out, the pinhole on the sealing gasket 3 can instantly rebound and self-seal, thereby ensuring the sealing effect of the sampling tube.

[0027] Preferably, a sealing film is provided inside the cover body 21 and below the sealing gasket 3. The sealing film may be a PP film or an aluminum-plastic film. The sealing film may prevent the liquid in the accommodating cavity 11 from contacting the sealing gasket 3, thereby preventing the sealing gasket 3 from being corroded by the liquid or producing irrelevant chemicals that dissolve in the liquid and affect subsequent PCR reactions.

[0028] The straw 22 is arranged directly below the sealing pad 3, and the lumen 23 overlaps with the central axes of the sealing pad 3 and the accommodating cavity 11. This arrangement enables the needle to accurately enter the straw after aligning with and piercing the middle position of the sealing pad 3.

[0029] The hollow structure of the straw 22 is an inverted cone, and the inner diameter of the portion of the straw 22 near the upper opening is larger, so that the needle can more easily enter the straw 22 after piercing the middle position of the sealing pad 3; the closer to the lower opening, the smaller the inner diameter of the straw 22, the greater the height to which the liquid level in the lumen can rise after the liquid at the bottom of the accommodating cavity 11 enters the lumen 23, and the easier it is for the needle to absorb the liquid in the straw 22. Preferably, the maximum inner diameter of the lumen 23 does not exceed 50% of the inner diameter of the lumen 11, so that the liquid level in the lumen 23 can rise to a reasonable height.

[0030] The lower end of the straw 22 extends into the lower part of the accommodating chamber 11 and is disposed close to the bottom of the accommodating chamber 11. The smaller the distance between the straw 22 and the bottom of the accommodating chamber 11, the easier it is for the liquid level at the bottom of the accommodating chamber to be higher than the lower end opening of the straw, and the easier it is for the liquid in the accommodating chamber 11 to be sucked out. However, the distance between the lower end of the straw 22 and the bottom of the inner side of the accommodating chamber 11 should not be too small to make it difficult for the liquid to enter the straw 22. It should be noted that in different application scenarios, the accommodating chamber 11 may be used to store liquids of different viscosities.

[0031] In this embodiment, the straw 22 is made of PP material. Those skilled in the art will appreciate that in other embodiments, the straw 22 may also be made of other materials with a certain hardness, as long as it is ensured that when the needle absorbs gas in the straw, the straw 22 will not deform to block its lower opening, so that the liquid in the accommodating cavity 11 cannot enter, and the same technical effect can be achieved.

[0032] In this embodiment, the straw 22 is integrally formed with the cover 21. In other embodiments, the upper end of the straw 22 and the lower end of the cover 21 can also be fixedly sealed and connected by gluing, clamping, etc.

[0033] The above embodiments are only used to illustrate the technical solution of the present application but not to limit it. The present application is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A sampling tube, characterized in that: include: A tube body, a tube cover and a sealing gasket; the tube body has a accommodating cavity with an opening at the top; the tube cover can be spirally sealed and connected to the tube body; the tube cover includes a cover body and a straw, the cover body is provided with a sealing gasket, and the top surface of the sealing gasket faces the top opening of the cover body; the straw has a hollow tube cavity, and the sealing gasket seals the tube cavity downwards.

2. The sampling tube according to claim 1, characterized in that: The sealing pad is made of elastic material with self-rebound sealing.

3. The sampling tube according to claim 2, characterized in that: The tube cavity, the sealing pad and the accommodating cavity have a common central axis.

4. The sampling tube according to claim 3, characterized in that: The tube cavity of the straw is in an inverted cone shape.

5. The sampling tube according to claim 4, characterized in that: The maximum inner diameter of the tube cavity of the straw does not exceed 50% of the inner diameter of the accommodating cavity.

6. The sampling tube according to claim 5, characterized in that: The cover body has an external threaded portion, and the tube body has an internal threaded portion. The external threaded portion and the internal threaded portion are screwed together to seal the accommodating cavity.

7. The sampling tube according to claim 2, characterized in that: A sealing film is arranged inside the cover body and below the sealing pad, and the sealing film is a PP material film or an aluminum-plastic film.

8. The sampling tube according to claim 1, characterized in that: The lower end of the straw extends into the lower part of the accommodating cavity.

9. The sampling tube according to any one of claims 1 to 8, characterized in that: The straw is made of PP material.

10. The sampling tube according to any one of claims 1 to 8, characterized in that: The straw is integrally formed with the cover body.

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