Suction head of pipettor

Abstract

The utility model discloses a pipettor suction head, and relates to the field of medical instruments, and the pipettor suction head comprises a straight tube used for being detachably connected to a pipettor; the bottom nozzle is detachably connected to the straight pipe, and the outer diameter of the end, away from the straight pipe, of the bottom nozzle is smaller than that of the straight pipe. According to the pipettor suction head disclosed by the invention, the straight pipe and the bottom nozzle are detachably combined for use, so that the pipettor suction head is suitable for various complex use conditions such as transfer of to-be-sucked liquid in a long and narrow container under the condition that the measuring range requirement is met; in addition, the straight pipe / bottom nozzle can be selected according to requirements and combined with an existing integrally-formed pipettor suction head for use, and the universality of the pipettor suction head is improved.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a pipette tip. Background Art

[0002] Pipette tips are tools used with pipettes to transfer small or trace amounts of liquid. Pipette tips of different specifications are used with pipettes of different specifications.

[0003] Currently, pipette tips are integrally formed and are available in a variety of specifications. When in use, the specification of the pipette tip is selected based on a comprehensive consideration of the volume of the liquid to be aspirated, the depth / opening size of the container in which the liquid is to be aspirated, and the pipetting accuracy requirements.

[0004] However, when the liquid to be aspirated is located in a long, narrow container, the pipette tip and the bottom of the pipette are often placed at an angle, which can easily lead to contamination of the bottom of the pipette. Furthermore, when aspirating liquid from deep within the container, pipette tips with a larger range are often selected at the expense of pipetting accuracy. Therefore, one-piece pipette tips are difficult to adapt to complex usage scenarios and have a limited range of applications. Utility Model Content

[0005] In view of the shortcomings of the above-mentioned related technologies, the present application provides a pipette tip. The pipette tip of the present application is used in a detachable combination of a straight tube and a bottom nozzle, and is suitable for various complex usage situations such as transferring liquid to be drawn from a narrow and long container while meeting the range requirements. The straight tube / bottom nozzle can also be selected according to needs and used in combination with existing one-piece pipette tips, thereby improving the universality of the pipette tip.

[0006] The present application provides a pipette tip that adopts the following technical solution:

[0007] A pipette tip, comprising:

[0008] Straight tube for detachable connection to the pipette;

[0009] The bottom nozzle is detachably connected to the straight tube, and the outer diameter of the bottom nozzle at one end away from the straight tube is smaller than the outer diameter of the straight tube.

[0010] Preferably, the straight tube includes a first liquid suction part, a receiving part and a first docking part for connecting to a pipette, which are connected in sequence. The inner diameter of the first docking part gradually decreases toward the receiving part, and the outer diameter of the first liquid suction part gradually decreases toward the receiving part. The bottom nozzle is detachably connected to the first liquid suction part.

[0011] Preferably, the bottom nozzle includes a second liquid suction part and a second docking part connected to each other for installation on the first liquid suction part, and the inner diameter of the second docking part gradually decreases toward approaching the second liquid suction part.

[0012] Preferably, the inner diameter of the second liquid absorbing portion is smaller than the inner diameter of the accommodating portion.

[0013] Preferably, the second liquid absorbing part is configured to be in a straight cylindrical shape, and the ratio of its inner diameter to the inner diameter of the accommodating part is 1:3.5-6.

[0014] Preferably, the outer diameter of the second liquid absorbing part is smaller than the outer diameter of the receiving part.

[0015] Preferably, the ratio of the length of the second liquid absorbing portion to the length of the accommodating portion is 1:0.7-0.9.

[0016] Preferably, the inner diameter of the first docking part away from the end of the accommodating part is consistent with the inner diameter of the second docking part away from the end of the second liquid absorption part, and the inner diameter of the first docking part close to the end of the accommodating part is consistent with the inner diameter of the second docking part close to the end of the second liquid absorption part.

[0017] Preferably, sealing protrusions are provided on the inner walls of the first docking portion and the second docking portion.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. On the one hand, the pipette tip can be adaptively extended according to the depth of the container for the liquid to be drawn through the detachable combination of the straight tube and the bottom nozzle; on the other hand, the outer diameter of the bottom nozzle away from the end of the straight tube is smaller than the outer diameter of the straight tube, which makes it easy for the combined pipette tip to be inserted into the narrow container to draw the liquid, and avoids the use of the oblique method to cause contamination of the bottom of the pipette as much as possible; on the other hand, the design of the outer diameter of the bottom nozzle away from the end of the straight tube is smaller than the outer diameter of the straight tube, which is conducive to improving the accuracy of the pipette tip when drawing liquid. In summary, this application improves the universality of the pipette tip through the detachable combination of the straight tube and the bottom nozzle.

[0020] 2. When the straight tube and bottom nozzle of the present application are used in combination with a pipette, they can also replace pipette tips of commonly used specifications on the market and perform the function of transferring the liquid to be sucked under normal working conditions;

[0021] 3. The combination of straight tubes and bottom nozzles can meet both large-scale and precision requirements, further improving the universality of pipette tips. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0024] Figure 2 This is a cross-sectional view used to illustrate the internal structure of the straight tube and bottom nozzle in the embodiment of the present application;

[0025] Figure 3 is a top view of a straight tube in an embodiment of the present application;

[0026] Figure 4 1 is a top view of the bottom nozzle in the embodiment of the present application.

[0027] Figure numerals: 1, straight tube; 11, first docking portion; 12, accommodating portion; 13, first liquid suction portion; 2, bottom nozzle; 21, second docking portion; 22, second liquid suction portion; 3, sealing protrusion. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 This application is described in further detail.

[0029] The present application embodiment discloses a pipette tip. Figure 1 A pipette tip includes a straight tube 1 for detachably connecting to a pipette and a bottom nozzle 2 detachably connected to the straight tube 1 , wherein the outer diameter of the bottom nozzle 2 away from one end of the straight tube 1 is smaller than the outer diameter of the straight tube 1 .

[0030] Specifically, refer to Figure 2 and Figure 3 The straight tube 1 includes a first liquid-absorbing portion 13, a receiving portion 12, and a first docking portion 11 for connecting to a pipette, which are connected in sequence. The inner diameter of the first docking portion 11 gradually decreases as it approaches the receiving portion 12, while the outer diameter of the first liquid-absorbing portion 13 gradually decreases as it moves away from the receiving portion 12. That is, the first liquid-absorbing portion 13 and the first docking portion 11 are both hollow frustum-shaped, and the receiving portion 12 is straight-cylindrical. The outer and inner diameters of the end of the first liquid-absorbing portion 13 near the receiving portion 12 are consistent with those of the receiving portion 12, and the outer and inner diameters of the end of the first docking portion 11 near the receiving portion 12 are consistent with those of the receiving portion 12. The bottom nozzle 2 is detachably connected to the first liquid-absorbing portion 13.

[0031] The dimensions of the straight tube 1 are as follows: the inner diameter of the end of the first docking portion 11 away from the accommodating portion 12 is 7.4 mm, the length of the first docking portion 11 is 15 mm, the inner diameter of the accommodating portion 12 is 6.4 mm, and the length is 45 mm, the inner diameter of the end of the first liquid absorption portion 13 away from the accommodating portion 12 is 4.4 mm, and the length of the first liquid absorption portion 13 is 15 mm. In addition, the dimensions of the straight tube 1 are designed according to the specifications of the existing pipette and the existing integrally formed pipette tip: the inner diameter of the end of the first docking portion 11 away from the accommodating portion 12 is 5.9 mm, the length of the first docking portion 11 is 10 mm, the inner diameter of the accommodating portion 12 is 4.5 mm, the length is 30 mm, the inner diameter of the end of the first liquid absorbing portion 13 away from the accommodating portion 12 is 2.6 mm, and the length of the first liquid absorbing portion 13 is 10 mm; or the inner diameter of the end of the first docking portion 11 away from the accommodating portion 12 is 3.8 mm, the length of the first docking portion 11 is 4 mm, the inner diameter of the accommodating portion 12 is 3 mm, the length is 23 mm, the inner diameter of the end of the first liquid absorbing portion 13 away from the accommodating portion 12 is 1.2 mm, the length of the first liquid absorbing portion 13 is 4 mm, etc.

[0032] Specifically, refer to Figure 2 and Figure 4 In order to facilitate the docking of the bottom nozzle 2 with the straight tube 1, the bottom nozzle 2 includes a second liquid suction part 22 and a second docking part 21 for being installed on the first liquid suction part 13. The inner diameter of the second docking part 21 gradually decreases towards the direction approaching the second liquid suction part 22, that is, the second docking part 21 is hollow frustum-shaped, and the second liquid suction part 22 is straight cylinder-shaped.

[0033] In order to facilitate the use of the second liquid suction portion 22 of the bottom nozzle 2 to transfer the liquid to be sucked in the narrow and long container, refer to Figure 1 and Figure 2 The outer diameter of the second liquid absorbing portion 22 is smaller than the outer diameter of the second docking portion 21 at the end near the second liquid absorbing portion 22. To reduce system errors when transferring relatively small amounts of liquid, the inner diameter of the second liquid absorbing portion 22 is smaller than the inner diameter of the second docking portion 21 at the end near the second liquid absorbing portion 22. That is, the connection between the second liquid absorbing portion 22 and the second connecting portion is stepped.

[0034] Specifically, the bottom nozzle 2 is designed with the following dimensions: the second docking portion 21 is the same size as the first docking portion 11, and the second liquid suction portion 22 has an inner diameter of 1.1 mm and a length of 58 mm. Furthermore, the bottom nozzle 2 can be configured to adapt to the dimensions of the straight tube 1 with which it is combined: the inner diameter of the second docking portion 21 at the end away from the second liquid suction portion 22 is 5.9 mm, the length of the second docking portion 21 is 10 mm, the inner diameter of the second liquid suction portion 22 is 0.95 mm, and the length is 40 mm; or the inner diameter of the second docking portion 21 at the end away from the second liquid suction portion 22 is 3.8 mm, the length of the second docking portion 21 is 4 mm, and the inner diameter of the second liquid suction portion 22 is 0.8 mm, and the length is 27 mm.

[0035] When it is necessary to transfer the liquid to be absorbed at full scale, the pipette is docked with the first docking portion 11 of the straight tube 1, and then the first liquid absorption portion 13 is directly used to transfer the liquid to be absorbed; or the pipette is docked with the first docking portion 11 of the straight tube 1, and then the first liquid absorption portion 13 is docked with a pipette tip integrally formed in existing specifications, and then the pipette tip integrally formed in existing specifications is used to contact the liquid to be absorbed for transfer, thereby achieving the purpose of improving the measuring range of the pipette tip integrally formed in existing specifications, and the strict sterile area formed by the combination of the straight tube 1 and the pipette tip integrally formed in existing specifications is extended, which avoids as much as possible the contamination of the bottom of the pipette by contact with the liquid to be absorbed when transferring the full scale of the liquid to be absorbed.

[0036] When it is only necessary to transfer the liquid to be drawn within a partial scale (one-fifth, one-quarter, one-third of the full scale, etc.), the inner diameter of the first docking portion 11 of the present application at the end away from the accommodating portion 12 is consistent with the inner diameter of the second docking portion 21 at the end away from the second liquid aspirating portion 22, and the inner diameter of the first docking portion 11 at the end close to the accommodating portion 12 is consistent with the inner diameter of the second docking portion 21 at the end close to the second liquid aspirating portion 22. The first method of use is as follows, so that the pipette can be directly docked with the second docking portion 21 of the bottom nozzle 2, and then the second liquid aspirating portion 22 can be directly used to transfer the liquid to be drawn. Therefore, when drawing the liquid to be drawn from a narrow and long container (such as a test tube), there is no need to tilt the narrow and long container, and the cross-contamination caused by the bottom of the pipette being easily contacted with the inner wall of the narrow and long container or the liquid to be drawn after being extended into the narrow and long container is avoided as much as possible.

[0037] The second method of use is as follows: a pipette is docked with the first docking portion 11 of the straight tube 1, and then the first liquid suction portion 13 of the straight tube 1 is docked with the second docking portion 21 of the bottom nozzle 2. The second liquid suction portion 22 of the bottom nozzle 2 is used to transfer the liquid to be sucked. On the one hand, the straight tube 1 further extends the bottom nozzle 2, making it easier to transfer the liquid to be sucked in a narrow and long container. On the other hand, the ratio of the length dimension of the second liquid suction portion 22 to the length dimension of the receiving portion 12 is 1:0.7-0.9, and the ratio of the inner diameter dimension of the second liquid suction portion 22 to the inner diameter dimension of the receiving portion 12 is 1:3.5-6. Transferring the liquid to be sucked through the receiving portion 12 and the second liquid suction portion 22 improves the accuracy of the liquid to be sucked while meeting the required range.

[0038] In addition, when the bottom nozzle 2 is used to transfer the liquid to be absorbed, the amount of liquid to be absorbed remaining in the more slender second liquid absorption part 22 is less than that remaining in the straight tube 1 / pipette tip of existing specifications, thereby reducing system errors.

[0039] Further, in order to improve the sealing and connection effect between the straight tube 1 and the bottom nozzle 2, refer to Figure 3 and Figure 4 A sealing protrusion 3 is provided on the inner wall of each of the first docking portion 11 and the second docking portion 21. In the embodiment of the present application, the sealing protrusion 3 is annular and integrally formed on the inner wall of the first docking portion 11 / the second docking portion 21. In other embodiments, the sealing protrusion 3 can also be a sealing ring made of rubber material and embedded in the inner wall of the first docking portion 11 / the second docking portion 21.

[0040] The implementation principle of a pipette tip in an embodiment of the present application is as follows: when it is necessary to transfer the liquid to be absorbed in a long and narrow container while meeting the range requirement, the bottom of the pipette is operated to be inserted into the first docking portion 11 of the straight tube 1, and then the pipette is operated to move to the first liquid absorption portion 13 of the straight tube 1 to align with the second docking portion 21 of the bottom nozzle 2 and insert it, thereby completing the detachable installation of the pipette, the straight tube 1 and the bottom nozzle 2, and then the pipette is driven so that the second docking portion 21 of the bottom nozzle 2 is inserted into the liquid to be absorbed, thereby completing the process of transferring the liquid to be absorbed in the long and narrow container while meeting the range requirement. In addition, according to the volume of the liquid to be absorbed and the shape and depth of the container in which it is located, the straight tube 1 and the bottom nozzle 2 can be flexibly selected and used in combination with the existing specifications of the one-piece molded pipette tip, thereby improving the universality of the pipette tip of the present application.

[0041] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The above are all optional embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pipette tip, characterized in that: include: Straight tube for detachable connection to the pipette; The bottom nozzle is detachably connected to the straight tube, and its outer diameter away from one end of the straight tube is smaller than the outer diameter of the straight tube; the straight tube includes a first liquid suction part, a receiving part and a first docking part for connecting to a pipette connected in sequence, the inner diameter of the first docking part gradually decreases in the direction approaching the receiving part, and the outer diameter of the first liquid suction part gradually decreases in the direction away from the receiving part, and the bottom nozzle is detachably connected to the first liquid suction part; the bottom nozzle includes a second liquid suction part connected to each other and a second docking part for being installed on the first liquid suction part, the inner diameter of the second docking part gradually decreases in the direction approaching the second liquid suction part; the inner diameter of the second liquid suction part is smaller than the inner diameter of the receiving part; the second liquid suction part is configured to be straight cylindrical, and the ratio of its inner diameter to the inner diameter of the receiving part is 1:3.5-6; the outer diameter of the second liquid suction part is smaller than the outer diameter of the receiving part.

2. A pipette tip according to claim 1, characterized in that: The ratio of the length of the second liquid absorbing part to the length of the accommodating part is 1:0.7-0.

9.

3. A pipette tip according to claim 1, characterized in that: The inner diameter of the first docking portion away from the end of the accommodating portion is consistent with the inner diameter of the second docking portion away from the end of the second liquid absorbing portion, and the inner diameter of the first docking portion close to the end of the accommodating portion is consistent with the inner diameter of the second docking portion close to the end of the second liquid absorbing portion.

4. A pipette tip according to claim 1, characterized in that: Sealing protrusions are provided on the inner walls of the first docking portion and the second docking portion.

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