CN221046106U - Disposable quantitative pipetting sampler - Google Patents

Abstract

The utility model discloses a disposable quantitative liquid transfer sampler, comprising a tube body and a piston rod, the tube body being formed with a sliding cavity extending along the length direction of the tube body and for the piston rod to be slidably embedded, the piston rod being formed with an air vent, the air vent extending through the piston rod to allow the sliding cavity to communicate with the external environment through the air vent; the tube body being formed with a sampling tube which is in communication with the sliding cavity and is slender along the length direction of the tube body, and the sampling tube extending to the end of the tube body to form a sampling port for aspirating liquid, the tube body being further formed with a liquid storage cavity between the sampling tube and the sliding cavity, the liquid storage cavity being respectively in communication with the sampling tube and the sliding cavity; thereby, a quantitative sampling liquid is sucked into the liquid storage cavity by the self-priming action of the capillary, and the sampling liquid stored in the liquid storage cavity can be pushed out by pressing the piston rod and dripped to a designated position, the sampling process is simple, the number of times other equipment such as a pipette is used is reduced, and the cost is saved.

Description

A disposable quantitative pipetting sampler

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a disposable quantitative liquid transfer sampler.

Background technique

Every year, more than 13 million people in China need to collect micro-peripheral blood, which is mainly to collect peripheral blood from the end of human nerves, which is commonly known as thumb blood collection in clinical practice. Thumb blood collection generally uses a blood collection needle/blood collection tube to draw blood samples, and then pushes the blood samples out through a balloon and adds them to a test tube or other reaction box containing reagents for reaction or dilution. This method has the following disadvantages: 1) The balloon needs to be soaked, assembled, emptied, etc. before use, and the use process is cumbersome; 2) The balloon and the blood collection needle/blood collection tube are split structures. After the blood is collected in the blood collection needle/blood collection tube, the balloon is installed on the blood collection needle/blood collection tube before the blood can be pushed out. The operation steps are many and complicated; 3) The blood collection volume of the blood collection needle/blood collection tube cannot be accurately controlled, and it depends on the experience or scale observation of medical staff, resulting in oversampling.

Utility Model Content

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a disposable quantitative pipetting sampler, which absorbs a quantitative sampling liquid into a liquid storage cavity through the self-priming action of the capillary, and the sampling liquid stored in the liquid storage cavity can be pushed out by pressing the piston rod and dripped to a designated position. The sampling process is simple and quick, and the number of times other equipment such as pipettes are used is reduced, saving costs.

In order to achieve the above-mentioned purpose, the utility model provides a disposable quantitative pipette sampler, including a tube body and a piston rod, the tube body is formed with a sliding cavity extending along the length direction of the tube body and for the piston rod to slide and be embedded, the piston rod is formed with an air hole, the air hole extends through the piston rod to make the sliding cavity and the external environment communicate with each other through the air hole; the tube body is formed with a sampling tube that is connected to the sliding cavity and is slender along the length direction of the tube body, and the sampling tube extends to the end of the tube body to form a sampling port for aspirating liquid, and the tube body is also formed with a liquid storage inner cavity between the sampling tube and the sliding cavity, and the liquid storage inner cavity is respectively connected with the sampling tube and the sliding cavity.

Furthermore, it also includes a filter element which is arranged between the sliding cavity and the liquid storage cavity and allows air to pass but not liquid to pass.

Furthermore, a limiting groove is formed on the inner wall of the tube body and is matched and buckled with the limiting boss preformed on the piston rod.

Furthermore, the tube body is formed with a handle portion extending and protruding from its side surface.

Furthermore, the liquid storage cavity is in the shape of an inverted trumpet that gradually narrows from the inside to the outside.

The utility model adopts the above-mentioned scheme, and its beneficial effect lies in that a certain amount of sampling liquid is sucked into the liquid storage cavity by the self-priming action of the capillary, and the sampling liquid stored in the liquid storage cavity can be pushed out by pressing the piston rod and dripped to the designated position. The sampling process is simple and quick, and the use of other equipment such as pipettes is reduced, saving costs; by providing a filter element that allows air to pass but not liquid to pass, the external environment is prevented from polluting the liquid stored in the liquid storage cavity; by the matching and buckled limiting bosses and limiting grooves, the piston rod is prevented from falling out of the tube body, which is convenient for use.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a disposable quantitative liquid transfer sampler in the present invention.

FIG. 2 is a cross-sectional view of the disposable quantitative liquid transfer sampler of the present invention.

FIG. 3 is a structural diagram of the piston rod in the utility model.

FIG. 4 is a partial cross-sectional view of the tube body of the present invention.

Among them, 1-tube body, 11-sliding cavity, 12-sampling tube, 121-sampling port, 13-liquid storage cavity, 14-limiting groove, 15-handling part, 2-piston rod, 21-air vent, 22-limiting boss, 3-filter element.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention is described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

Referring to Figures 1 and 2, a schematic diagram of the structure of a disposable quantitative pipetting sampler in this embodiment is shown, which includes a tube body 1 and a piston rod 2. The tube body 1 is a tubular structure that is wide at the top and narrow at the bottom and is quasi-inverted conical. The upper end of the tube body 1 is formed with a sliding cavity 11 extending along the length direction of the tube body 1; the piston rod 2 is a cylinder with a diameter that matches the size of the accommodating cross-section of the sliding cavity 11. The piston rod 2 is inserted and embedded in the accommodating space of the sliding cavity 11. By pressing the piston rod 2, the piston rod 2 can slide along the inner wall of the tube body 1. In addition, a hand-held portion 15 is provided at the upper end of the tube body 1 for the convenience of the user to take. One end of the hand-held portion 15 is integrally connected to the tube body 1, and the other end extends and protrudes from the surfaces of both sides of the tube body 1.

Referring to FIG. 3 , in the present embodiment, at least one circle of annular limiting bosses 22 are preformed on the circumferential surface of the piston rod 2, and correspondingly, at least one circle of limiting grooves 14 matching the specifications of the limiting bosses 22 are formed around the inner wall of the tube body 1. When the piston rod 2 slides along the inner wall of the tube body 1, the limiting bosses 22 and the limiting grooves 14 cooperate and interlock with each other to form a blocking effect, which can prevent the piston rod 2 from slipping out of the tube body 1.

Continuing to refer to FIG. 2 , in the present embodiment, a vent hole 21 is formed on the piston rod 2. The vent hole 21 extends through the piston rod 2 so that the slide cavity 11 is connected to the external environment through the vent hole 21 , which is beneficial to the gas exchange between the slide cavity 11 and the external environment and balances the air pressure inside and outside the pipette sampler.

As shown in FIG. 4 , in this embodiment, a sampling tube 12 (i.e., a capillary tube) is formed at the lower end of the tube body 1 and is slender along the length direction of the tube body 1. One end of the sampling tube 12 is connected to the slide cavity 11, and the other end extends to the end of the tube body 1 to form a sampling port 121 for aspirating liquid. Furthermore, an inverted trumpet-shaped liquid storage cavity 13 is formed between the sampling tube 12 and the slide cavity 11 in the tube body 1, and the liquid storage cavity 13 is connected to the sampling tube 12 and the slide cavity 11, respectively.

Specifically, when the air hole 21 is opened, the air pressure inside and outside the pipette sampler is balanced, and the liquid to be tested is absorbed into the liquid storage cavity 13 by the self-priming effect of the capillary (the self-priming effect of the capillary is a conventional technical means and will not be elaborated here); when the air hole 21 is blocked by hand to close it, the pipette sampler is not connected to the external environment, and the air pressure inside the pipette sampler is lower than the external air pressure. By pressing the piston rod 2 to compress the air in the sliding cavity 11 to do work, the liquid to be tested in the liquid storage cavity 13 is pushed out and drips to the designated position. The sampling process is simple and fast, reducing the use of other equipment such as pipettes, thereby achieving the purpose of cost saving. It should be noted that the capacity specifications of the liquid storage cavity 13 and the sampling tube 12 are pre-set according to actual needs to achieve accurate quantification of each pipette sampler.

Furthermore, a filter element 3 is provided between the sliding cavity 11 and the liquid storage cavity 13, and the filter element 3 is made of PE sintering. The PE sintering filter element 3 has a small pore size, which can block the passage of liquid to prevent the external environment, such as bacteria and viruses in the air, from directly contacting and contaminating the liquid stored in the liquid storage cavity 13; at the same time, the filter element 3 does not hinder the passage of gas, does not affect the gas exchange inside and outside the liquid sampler, and avoids causing an imbalance in the air pressure inside and outside the liquid sampler.

In summary, through the capillary, the air hole 21 and the piston rod 2, the liquid to be tested can be accurately quantified and the pipetting operation can be completed. The process is simple and fast, has the advantage of flexible use, and reduces the use of other equipment such as pipettes, saving costs; by providing a filter element 3 that allows air to pass but not liquid to pass, bacteria and viruses in the external environment are prevented from contaminating the liquid stored in the liquid storage cavity; by the matching and snap-fitting limit boss 22 and limit groove 14, the piston rod is prevented from falling out of the tube body; by providing a hand-held portion 15, it is convenient for the user to take the pipette sampler.

The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the present invention, makes more possible changes and modifications to the present invention by using the technical contents disclosed above, or makes modifications to the present invention, shall be equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the present invention shall be included in the protection scope of the present invention.

Claims (5)

1. A disposable quantitative liquid transfer sampler, characterized in that: it comprises a tube body (1) and a piston rod (2), the tube body (1) is formed with a sliding cavity (11) extending along the length direction of the tube body (1) and for the piston rod (2) to be slidably embedded, the piston rod (2) is formed with an air vent (21), the air vent (21) extends through the piston rod (2) so that the sliding cavity (11) and the external environment are connected through the air vent (21); the tube body (1) is formed with a sampling tube (12) which is in communication with the sliding cavity (11) and is slender along the length direction of the tube body (1), and the sampling tube (12) extends to the end of the tube body (1) to form a sampling port (121) for aspirating liquid, and the tube body (1) is also formed with a liquid storage cavity (13) between the sampling tube (12) and the sliding cavity (11), and the liquid storage cavity (13) is respectively connected with the sampling tube (12) and the sliding cavity (11). 2. A disposable quantitative liquid transfer sampler according to claim 1, characterized in that it also includes a filter element (3) disposed between the sliding cavity (11) and the liquid storage cavity (13) and capable of passing air but not liquid. 3. A disposable quantitative pipette sampler according to claim 1, characterized in that: a limiting groove (14) is formed around the inner wall of the tube body (1) and is matched and snap-fitted with a pre-formed limiting boss (22) on the piston rod (2). 4. A disposable quantitative liquid transfer sampler according to claim 1, characterized in that: the tube body (1) is formed with a hand-held portion (15) extending and protruding from its side surface. 5. A disposable quantitative liquid transfer sampler according to claim 1, characterized in that: the liquid storage cavity (13) is in the shape of an inverted trumpet that gradually narrows from the inside to the outside.