Microbiological test pipettor

Abstract

The utility model belongs to the technical field of pipettors, and particularly relates to a microbiological examination pipettor which comprises a suction bag and a suction tube, the upper end and the lower end of the suction bag are respectively provided with an air hole and a suction tube assembly port, the suction tube is inserted into the suction bag through the suction tube assembly port, the suction tube assembly port is sealed with the outer wall of the suction tube, and one end of the suction tube in the suction bag is closed. The end, located outside the suction bag, of the suction pipe is open, and the part, located in the suction pipe assembly opening, of the side face of the suction pipe is provided with a through groove. The suction bag and the suction pipe of the pipettor are ingenious in design, the suction pipe assembly opening and the outer wall of the suction pipe are sealed, the closed end of the suction pipe is matched with the air hole, and the through groove is formed, so that efficient exhaust and stable liquid suction and discharge are achieved. Various use modes meet different experiment scenes and operation habits, the liquid drainage amount can be accurately controlled, and the liquid drainage device can be operated like a conventional dropper. Through a series of innovative designs, the accuracy, reliability and efficiency of microbiological inspection work are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipettes, and in particular relates to a microbiological testing pipette. Background Art

[0002] In the field of microbiology testing, accurate, reliable, and efficient liquid handling is a key factor in successful experiments. Microbiology testing involves the processing, analysis, and detection of various microbial samples, which often requires precise aspiration and transfer of liquid samples of varying volumes, such as culture media and reagents.

[0003] However, traditional pipettes are relatively limited in their use and may not meet the needs of different experimental scenarios and operating habits. For example, in some cases, a pipette is needed that can perform simple aspiration and discharge operations like a conventional dropper while also providing more precise control functions, a balance that traditional pipettes often struggle to achieve. Therefore, to address these issues, we have proposed a microbiological testing pipette.

[0004] The approaches described in this section are not necessarily approaches that have been previously conceived or employed. Unless otherwise indicated, it should not be assumed that any approach described in this section is prior art simply by virtue of its inclusion in this section. Similarly, unless otherwise indicated, the issues raised in this section should not be considered as having been recognized in any prior art. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the utility model discloses a microbiological testing pipette.

[0006] In order to achieve the above purpose, a technical solution adopted by the utility model is:

[0007] A microbiological testing pipette includes a suction bag and a straw. The upper and lower ends of the suction bag respectively have an air hole and a straw assembly port. The straw is inserted into the suction bag through the straw assembly port, and the straw assembly port is sealed with the outer wall of the straw. The end of the straw located inside the suction bag is closed, and the longitudinal projection area of ​​the closed end of the straw can cover the longitudinal projection area of ​​the air hole. The end of the straw located outside the suction bag is open, and the part of the side of the straw located inside the straw assembly port has a through groove.

[0008] Furthermore, the suction bag has an extension portion extending downward at the suction tube assembly opening.

[0009] Furthermore, the straw has a convex ring on its circumference, and the extension portion has an annular groove for accommodating the convex ring.

[0010] Furthermore, the air hole is in the shape of a circle coaxially arranged with the straw.

[0011] Furthermore, the distance between the top end of the straw and the air hole is smaller than the diameter of the air hole.

[0012] Furthermore, the top end of the straw is spherical.

[0013] Furthermore, the through groove is elliptical, and the major axis of the ellipse of the through groove is parallel to the axis of the straw.

[0014] Furthermore, the suction bag is spherical, and the elliptical center of the through groove is horizontally aligned with the spherical center of the suction bag.

[0015] Furthermore, the through grooves have at least two groups, each group of through grooves has two through grooves, the two through grooves in each group are symmetrically arranged around the axis of the straw, and the through grooves in each group are evenly distributed around the axis of the straw.

[0016] Furthermore, the through slots are in two groups.

[0017] The utility model discloses a microbiological testing pipette, the suction bag and straw of the pipette are cleverly designed, the straw assembly port is sealed with the outer wall of the straw, the closed end of the straw cooperates with the air hole and the provision of the through groove, so as to achieve efficient exhaust, stable liquid suction and discharge. A variety of usage methods meet different experimental scenarios and operating habits, which can not only accurately control the discharge volume, but also operate like a conventional dropper. The extension of the suction bag cooperates with the convex ring of the straw to enhance the connection firmness and sealing. The circular design of the air hole, the special shape of the top of the straw, and the elliptical shape and specific distribution of the through groove optimize the gas flow path, ensure the ventilation capacity, and improve the efficiency of liquid suction and discharge. At the same time, the design of the through groove also improves the stability of the pipette, making it convenient for users to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0020] Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention;

[0021] Figure 3 for Figure 2 A schematic diagram of the structure at point A in the middle;

[0022] Figure 4 for Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0023] Figure 5Schematic diagram of the connection of the straw in one embodiment of the present invention.

[0024] The meanings of the reference numerals in the accompanying drawings are:

[0025] Suction bag 1, air hole 11, straw assembly opening 12, extension portion 13, annular groove 14, straw 2, through groove 21, convex ring 22. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Reference Figure 1-Figure 5 As shown, the microbial testing pipette of this embodiment includes a suction bag 1 and a straw 2. The upper and lower ends of the suction bag 1 respectively have an air hole 11 and a straw assembly port 12. The straw 2 is inserted into the suction bag 1 through the straw assembly port 12, and the straw assembly port 12 is sealed with the outer wall of the straw 2. The end of the straw 2 located in the suction bag 1 is closed, and the longitudinal projection area of ​​the closed end of the straw 2 can cover the longitudinal projection area of ​​the air hole 11. The end of the straw 2 located outside the suction bag 1 is open, and the part of the side of the straw 2 located in the straw assembly port 12 has a through groove 21, and the through groove 21 can connect the internal space of the straw 2 and the suction bag 1.

[0028] During use, the user pinches the suction capsule 1 with the thumb and middle finger until the inner wall of the suction capsule 1 contacts the straw 2 , that is, the straw 2 is clamped by the inner walls on both sides of the suction capsule 1 , so that the entire pipette can be held stably.

[0029] After venting, insert the open end of straw 2 into the liquid to be drawn. This creates a communicating vessel between the container and straw 2, allowing the liquid to automatically flow into straw 2. Once straw 2 is filled with liquid, press the top of the suction capsule 1 with your index finger, forcing the inner side of the capsule's top against the top of the straw 2. This seals the top and bottom ends of the air hole 11 with your index finger and straw 2, respectively, sealing the interior of the suction capsule 1. The open end of straw 2 is then removed from the liquid. After removal, the negative pressure within the suction capsule 1 prevents the liquid from being discharged.

[0030] When discharging liquid, move the open end of the straw 2 above the target container, then slowly lift the index finger to release the blockage of the air hole 11. At this time, the interior of the suction bag 1 is connected to the atmosphere, and the liquid in the straw 2 can be discharged through the open end of the straw 2.

[0031] It's worth noting that during the drainage operation, the ventilation capacity of pore 11 can be precisely adjusted by varying the degree of unsealing of pore 11. As the degree of unsealing of pore 11 changes, the size of the gas exchange channel between the interior of the suction capsule 1 and the outside atmosphere also changes accordingly. When the degree of unsealing is low, gas enters the suction capsule 1 slowly, and the pressure inside the suction capsule 1 recovers relatively slowly, causing the liquid in the straw 2 to be slowly discharged under the action of a small pressure differential, thereby achieving a slower liquid discharge rate. Conversely, when the degree of unsealing of pore 11 increases, gas can enter the suction capsule 1 more quickly, causing the pressure inside the suction capsule 1 to rise rapidly. The liquid in the straw 2 is discharged faster due to the larger pressure differential, thereby achieving a faster liquid discharge rate.

[0032] This adjustable liquid discharge rate offers numerous advantages for microbiological testing, catering to diverse scenarios. In experiments requiring precise measurement of liquid volume, such as the preparation of microbial culture media, researchers can meticulously control the degree of unsealing of pores 11 to precisely discharge each drop of liquid, ensuring the correct proportions of the various components in the culture medium. This is crucial for controlling the growth environment of microorganisms and can effectively improve the accuracy and repeatability of experimental results.

[0033] In addition, the requirements for liquid discharge speed vary in different experimental operation scenarios. In some rapid pipetting operations, a faster discharge speed may be required to improve work efficiency; while in some experimental steps that require extremely high liquid discharge accuracy, a slower and more stable discharge speed is required. The pipette perfectly adapts to these diverse needs by adjusting the degree of unsealing of the pores 11. Whether in large-scale sample processing or delicate micro-experiments, it can exert its excellent discharge control capabilities, providing great convenience and accuracy for microbiological testing.

[0034] It should be emphasized that when using the pipette in this way, the user can squeeze the pipette to achieve a steady hold.

[0035] In addition to the above usage, this pipette can also be used in the following ways.

[0036] During use, the user pinches the suction bag 1 with the thumb and middle finger to exhaust air. When pinching, the open end of the straw 2 and the air hole 11 will exhaust air at the same time, which can improve the exhaust efficiency.

[0037] After the air is exhausted, the open end of the straw 2 is inserted into the liquid to be sucked. Then, the index finger presses the upper end of the suction bag 1 so that the inner side of the top of the suction bag 1 abuts against the upper end of the straw 2, so that the upper and lower ends of the air hole 11 are respectively closed by the index finger and the straw 2. At this time, the pipette can be used as a conventional dropper. That is, the suction bag 1 is released by the thumb and middle finger, so that the suction bag 1 returns to its original shape under the action of its own elasticity. Under the action of negative pressure, the liquid is sucked into the straw 2, and the liquid is sucked.

[0038] When draining the liquid, the suction bag 1 can be squeezed to drain the liquid, or the air hole 11 can be unsealed by lifting the index finger to drain the liquid.

[0039] In this embodiment, the straw assembly opening 12 of the suction bag 1 has an extension portion 13 extending downward. The provision of the extension portion 13 can increase the contact area between the straw assembly opening 12 and the straw 2, thereby improving the installation strength of the straw 2 while ensuring sealing.

[0040] Furthermore, the circumference of the straw 2 has a convex ring 22, and the extension 13 has an annular groove 14 for accommodating the convex ring 22. This design has many significant advantages. First, from the perspective of connection security, the combination of the convex ring 22 and the annular groove 14 forms a structure similar to a snap. When the straw 2 is inserted into the extension 13 of the suction capsule 1, the convex ring 22 can be tightly embedded in the annular groove 14, so that the straw 2 can be effectively fixed in both the axial and radial directions. During actual use, whether the pipette is moved, shaken, or subjected to a certain degree of external force, this connection method can ensure that the straw 2 and the suction capsule 1 will not easily loosen or fall off, greatly enhancing the stability of the overall structure. For example, in a laboratory environment, there may be some unexpected collisions or rapid movement of the pipette during operation, and this secure connection design can effectively prevent the straw from falling off due to a loose connection, thereby ensuring the continuity and accuracy of the experimental operation.

[0041] Secondly, the cooperation between the protruding ring 22 and the annular groove 14 also plays a key role in sealing. The protruding ring 22 and the annular groove 14 can form a tight fit, effectively preventing gas and liquid from leaking at the connection between the straw 2 and the suction bag 1, providing a reliable guarantee for microbiological testing.

[0042] In this embodiment, the air hole 11 is circular and coaxial with the pipette 2. As gas passes through the air hole 11, the circular boundary allows the airflow to spread evenly around the hole, preventing sudden changes in direction or turbulence at the hole. The circular air hole allows gas to pass smoothly, reducing airflow resistance and ensuring smoother and more efficient gas flow within the pipette.

[0043] During the actual operation of the pipette, this smooth air flow has a positive impact on improving work efficiency. During the exhaust phase, when the user squeezes the suction capsule 1 to deflate, the circular air holes can quickly expel the air inside the capsule 1, accelerating the exhaust process. This not only saves operation time, but also ensures that the air in the suction capsule 1 is completely exhausted in a short time, creating optimal conditions for subsequent liquid aspiration. For example, when performing multiple liquid aspiration operations in succession, the rapid exhaust efficiency can greatly improve the overall progress of the experiment.

[0044] In this embodiment, the distance between the top of the pipette 2 and the air hole 11 is smaller than the diameter of the air hole 11, and the top of the pipette 2 is spherical. This design further optimizes the flow path of gas within the pipette, making the gas flow smoother and improving the efficiency of liquid suction and discharge.

[0045] In this embodiment, the through-slot 21 is elliptical, with the major axis of the ellipse parallel to the axis of the straw 2. Furthermore, the suction bladder 1 is spherical, with the center of the ellipse of the through-slot 21 horizontally aligned with the center of the sphere of the suction bladder 1. This arrangement ensures the ventilation capacity of the through-slot 21.

[0046] In this embodiment, there are two groups of through grooves 21, each group having two through grooves 21. The two through grooves 21 in each group are symmetrically arranged around the axis of the straw 2, and the through grooves 21 in each group are evenly distributed around the axis of the straw 2. This arrangement allows the inner wall of the suction capsule 1 to abut the edge at the center of the through grooves 21 when the user pinches the suction capsule 1 at its maximum outer diameter. The spacing between the middle portions of each group of through grooves 21 is smaller than the spacing between the upper and lower ends. In other words, the through grooves 21 appear as an inwardly concave arc when viewed from the side, thus forming a more stable contact point, further enhancing the pipette's holding ability.

[0047] In summary, the utility model discloses a microbiological testing pipette, the suction bag and straw of the pipette are cleverly designed, the straw assembly port is sealed with the outer wall of the straw, the closed end of the straw cooperates with the air hole and the provision of the through groove, so as to achieve efficient exhaust, stable liquid suction and discharge. A variety of usage methods meet different experimental scenarios and operating habits, which can not only accurately control the amount of liquid discharged, but also operate like a conventional dropper. The extension of the suction bag cooperates with the convex ring of the straw to enhance the connection firmness and sealing. The circular design of the air hole, the special shape of the top of the straw, and the elliptical shape and specific distribution of the through groove optimize the gas flow path, ensure the ventilation capacity, and improve the efficiency of liquid suction and discharge. At the same time, the design of the through groove also enhances the stabilization ability of the pipette, making it easier for users to operate. In short, the microbiological testing pipette improves the accuracy, reliability and efficiency of microbiological testing work through a series of innovative designs, and provides a better solution for liquid operations in the field of microbiological testing.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical principles disclosed herein shall be covered by the claims of the present invention.

Claims

1. A microbiological testing pipette, comprising a suction capsule and a pipette, characterized in that: The suction bag has an air hole and a straw assembly port at the upper and lower ends respectively. The straw is inserted into the suction bag through the straw assembly port, and the straw assembly port is sealed with the outer wall of the straw. The end of the straw located inside the suction bag is closed, and the longitudinal projection area of ​​the closed end of the straw can cover the longitudinal projection area of ​​the air hole. The end of the straw located outside the suction bag is open, and the part of the side of the straw located inside the straw assembly port has a through groove.

2. A microbiological testing pipette according to claim 1, characterized in that: The suction bag has an extension portion extending downward at the suction tube assembly opening.

3. A microbiological testing pipette according to claim 2, characterized in that: The circumferential surface of the straw is provided with a convex ring, and the extending portion is provided with an annular groove for accommodating the convex ring.

4. A microbiological testing pipette according to claim 1, characterized in that: The air hole is in a circular shape coaxially arranged with the straw.

5. A microbiological testing pipette according to claim 4, characterized in that: The distance between the top end of the straw and the air hole is smaller than the diameter of the air hole.

6. A microbiological testing pipette according to claim 4, characterized in that: The top end of the straw is spherical.

7. A microbiological testing pipette according to claim 1, characterized in that: The through groove is elliptical, and the elliptical major axis of the through groove is parallel to the axis of the straw.

8. A microbiological testing pipette according to claim 7, characterized in that: The suction bag is spherical, and the elliptical center of the through groove is horizontally aligned with the spherical center of the suction bag.

9. A microbiological testing pipette according to claim 7, characterized in that: The through grooves have at least two groups, each group of through grooves has two through grooves, the two through grooves in each group are symmetrically arranged around the axis of the straw, and the through grooves in each group are evenly distributed around the axis of the straw.

10. A microbiological testing pipette according to claim 9, characterized in that: There are two groups of through slots.

Images