CN221046106U - Disposable quantitative pipetting sampler - Google Patents

Abstract

The utility model discloses a disposable quantitative pipetting sampler which comprises a pipe body and a piston rod, wherein a sliding cavity which extends along the length direction of the pipe body and is used for sliding and embedding the piston rod is formed in the pipe body; the tube body is provided with a sampling tube which is communicated with the sliding cavity and is slender along the length direction of the tube body, the sampling tube extends to the end part of the tube body to form a sampling port for absorbing liquid, the tube body is also provided with a liquid storage cavity which is arranged between the sampling tube and the sliding cavity, and the liquid storage cavity is respectively communicated with the sampling tube and the sliding cavity; from this, absorb quantitative sample liquid to stock solution intracavity through the self-priming effect of capillary, can release the sample liquid that the stock solution inner chamber stored and drip to the assigned position through pressing the piston rod, sampling process is simple, reduces the number of times of using of other equipment such as pipette, practices thrift the cost.

Description

Disposable quantitative pipetting sampler

Technical Field

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

Background

More than 1300 ten thousand people need to collect trace peripheral blood every year in China, and the trace peripheral blood collection is mainly used for collecting peripheral blood at the nerve terminal of a human body, namely, the trace peripheral blood collection is clinically commonly called thumb blood collection. Thumb blood collection typically draws a blood sample through a lancet/tube, then pushes the blood sample out through a balloon and into a test tube or other reaction cartridge containing reagents for reaction or dilution, which has the following drawbacks: 1) Before the balloon is used, operations such as infiltration, assembly, evacuation and the like are required, and the use process is complicated; 2) The separation type structure is arranged between the saccule and the blood taking needle/blood taking tube, after blood is collected in the blood taking needle/blood taking tube, the saccule is arranged on the blood taking needle/blood taking tube, so that the blood can be pushed out, and the operation steps are more and complex; 3) The blood sampling amount of the blood sampling needle/blood sampling tube cannot be accurately controlled, and the blood sampling amount is observed by depending on the experience or scales of medical staff, so that over sampling is caused.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art, and provides a disposable quantitative pipetting sampler which is characterized in that quantitative sampling liquid is sucked into a liquid storage cavity through the self-priming action of a capillary tube, the sampling liquid stored in the liquid storage cavity can be pushed out by pressing a piston rod and is dripped to a designated position, the sampling process is simple and quick, the use times of other equipment such as a pipette are reduced, and the cost is saved.

In order to achieve the above purpose, the disposable quantitative pipetting sampler provided by the utility model comprises a pipe body and a piston rod, wherein the pipe body is formed with a sliding cavity which extends along the length direction of the pipe body and is used for sliding and embedding the piston rod, the piston rod is formed with an air vent, and the air vent extends through the piston rod to enable the sliding cavity to be communicated with the external environment through the air vent; the tube body is formed with a sampling tube which is communicated with the sliding cavity and is slender along the length direction of the tube body, the sampling tube extends to the end part of the tube body to form a sampling port for absorbing liquid, 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 communicated with the sampling tube and the sliding cavity.

Further, the filter element is arranged between the sliding cavity and the liquid storage cavity and is overaerated but not liquid.

Further, a limit groove which is matched and buckled with the preformed limit boss on the piston rod is formed on the inner wall of the pipe body in a surrounding mode.

Further, the tube body is formed with a hand-held portion extending to protrude to a side surface thereof.

Further, the liquid storage cavity is in an inverted horn shape which is gradually narrowed from inside to outside.

The utility model adopts the scheme, and has the advantages that the quantitative sampling liquid is sucked into the liquid storage cavity through the self-suction effect of the capillary tube, the sampling liquid stored in the liquid storage cavity can be pushed out and dripped to the appointed position through pressing the piston rod, the sampling process is simple and quick, the use of other equipment such as a pipette is reduced, and the cost is saved; the filter element which is overgas and overliquid is arranged, so that the liquid stored in the liquid storage cavity is prevented from being polluted by the external environment; through spacing boss and spacing recess of matched with lock joint, avoid the piston rod to take off the body, facilitate the use.

Drawings

Fig. 1 is a schematic structural view of a disposable quantitative pipetting sampler in the utility model.

FIG. 2 is a cross-sectional view of a disposable quantitative pipetting sampler in accordance with the utility model.

Fig. 3 is a structural view of a piston rod in the present utility model.

Fig. 4 is a partial cross-sectional view of a tube body in accordance with the present utility model.

The device comprises a 1-tube body, a 11-sliding cavity, a 12-sampling tube, a 121-sampling port, a 13-liquid storage cavity, a 14-limit groove, a 15-hand-held part, a 2-piston rod, 21-vent holes, 22-limit bosses and a 3-filter element.

Detailed Description

In order that the utility model may be understood more fully, the utility model will be described with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1 and 2, which are schematic structural views of a disposable quantitative pipetting sampler in this embodiment, the disposable quantitative pipetting sampler comprises a tube body 1 and a piston rod 2, wherein the tube body 1 is in an inverted cone-like tubular structure with a wide upper part and a narrow lower part, and a sliding cavity 11 extending along the length direction of the tube body 1 is formed at the upper end part of the tube body 1; the piston rod 2 is a cylinder with the diameter matched with the size of the accommodating section of the sliding cavity 11, the piston rod 2 is inserted and embedded in the accommodating space of the sliding cavity 11, and the piston rod 2 can slide along the inner wall of the pipe body 1 by pressing the piston rod 2. In addition, a hand-held part 15 which is convenient for a user to take is arranged at the upper end part of the pipe body 1, one end of the hand-held part 15 is integrally connected to the pipe body 1, and the other end extends and protrudes to form the two side surfaces of the pipe body 1.

Referring to fig. 3, in this embodiment, at least one ring of annular limiting boss 22 is preformed on the circumferential surface of the piston rod 2, correspondingly, at least one ring of limiting groove 14 matched with the specification of the limiting boss 22 is formed on the inner wall of the tube body 1 in a surrounding manner, and when the piston rod 2 slides along the inner wall of the tube body 1, the limiting boss 22 and the limiting groove 14 are matched, buckled and mutually abutted to form a blocking effect, so that the piston rod 2 can be prevented from falling out of the tube body 1.

With continued reference to fig. 2, in this embodiment, the piston rod 2 is formed with a vent hole 21, and the vent hole 21 extends through the piston rod 2 to connect the sliding cavity 11 with the external environment via the vent hole 21, which is beneficial to exchanging air between the sliding cavity 11 and the external environment, and balancing the internal and external air pressures of the pipetting sampler.

Referring to fig. 4, in the present embodiment, a sampling tube 12 (i.e., a capillary tube) is formed at the lower end of the tube body 1 so as to be elongated in the longitudinal direction of the tube body 1, one end of the sampling tube 12 communicates with the slide chamber 11, and the other end extends to the end of the tube body 1 to form a sampling port 121 for sucking liquid. Further, a liquid storage cavity 13 in the shape of an inverted horn gradually narrowing from inside to outside is formed in the tube body 1 between the sampling tube 12 and the sliding cavity 11, and the liquid storage cavity 13 is respectively communicated with the sampling tube 12 and the sliding cavity 11.

Specifically, when the air holes 21 are opened, the internal and external air pressures of the pipetting sampler are balanced, and the liquid to be measured is absorbed into the liquid storage cavity 13 through the self-priming action of the capillary tube (the self-priming action of the capillary tube is a conventional technical means, and is not described in detail here); when the air holes 21 are plugged by hands to be closed, the liquid-transferring sampler is not conducted with the external environment, the air pressure in the liquid-transferring sampler is lower than the external air pressure, the air in the sliding cavity 11 is compressed by pressing the piston rod 2 to do work, so that the liquid to be tested in the liquid storage cavity 13 is pushed out and dripped to a designated position, the sampling process is simple and quick, the use of other equipment such as a pipette is reduced, and the aim of saving cost is achieved. It should be noted that, the capacity specifications of the liquid storage cavity 13 and the sampling tube 12 are preset according to actual needs, so as to realize accurate quantification of each pipetting sampler.

Furthermore, a filter element 3 which is too gas but not too liquid is arranged between the sliding cavity 11 and the liquid storage cavity 13, and the filter element 3 is formed by sintering PE. The pore diameter of the PE sintering filter element 3 is smaller, so that liquid can be prevented from passing through the PE sintering filter element to avoid direct contact of bacteria and viruses in external environment such as air and pollution of the liquid stored in the liquid storage cavity 13; meanwhile, the filter element 3 does not obstruct the gas passing, does not influence the gas exchange inside and outside the liquid-transferring sampler, and avoids the unbalance of the gas pressure inside and outside the liquid-transferring sampler.

In sum, through the capillary tube, the ventilation holes 21 and the piston rod 2, the liquid to be measured can be precisely quantified and the pipetting operation can be completed, the process is simple and quick, the flexible taking advantage is achieved, the use of other equipment such as a pipette is reduced, and the cost is saved; the filter element 3 which is overgas and overliquid is arranged, so that bacteria and viruses in the external environment are prevented from polluting the liquid stored in the liquid storage cavity; the piston rod is prevented from falling out of the pipe body through the limit boss 22 and the limit groove 14 which are matched and buckled; by providing the hand-held portion 15, the user can conveniently take the pipette sampler.

The above-described embodiments are merely preferred embodiments of the present utility model, and are not intended to limit the present utility model in any way. Any person skilled in the art, using the disclosure above, may make many more possible variations and modifications of the technical solution of the present utility model, or make many more modifications of the equivalent embodiments of the present utility model without departing from the scope of the technical solution of the present utility model. Therefore, all equivalent changes made according to the inventive concept are covered by the protection scope of the utility model without departing from the technical scheme of the utility model.

Claims (5)

1. A disposable quantitative pipetting sampler, characterized in that: the sliding type air cylinder comprises a pipe body (1) and a piston rod (2), wherein the pipe body (1) is provided with a sliding cavity (11) which extends along the length direction of the pipe body (1) and is used for sliding and embedding the piston rod (2), the piston rod (2) is provided with an air vent (21), and the air vent (21) extends through the piston rod (2) so as to enable the sliding cavity (11) to be communicated with the external environment through the air vent (21); the liquid suction tube is characterized in that the tube body (1) is provided with a sampling tube (12) which is communicated with the sliding cavity (11) and is in an elongated shape along the length direction of the tube body (1), the sampling tube (12) extends to the end part of the tube body (1) to form a sampling port (121) for sucking liquid, the tube body (1) is also provided with a liquid storage inner cavity (13) which is arranged between the sampling tube (12) and the sliding cavity (11), and the liquid storage inner cavity (13) is respectively communicated with the sampling tube (12) and the sliding cavity (11).

2. A disposable quantitative pipetting sampler as recited in claim 1 wherein: the filter element (3) is arranged between the sliding cavity (11) and the liquid storage cavity (13) and is overaerated but overliquid.

3. A disposable quantitative pipetting sampler as recited in claim 1 wherein: the inner wall of the pipe body (1) is formed with a limit groove (14) which is matched and buckled with a limit boss (22) preformed on the piston rod (2).

4. A disposable quantitative pipetting sampler as recited in claim 1 wherein: the tube body (1) is formed with a hand-held portion (15) extending to protrude to a side surface thereof.

5. A disposable quantitative pipetting sampler as recited in claim 1 wherein: the liquid storage cavity (13) is in an inverted horn shape which is gradually narrowed from inside to outside.