A pipette extension device

Abstract

This utility model provides a pipette extension device, relating to the field of pipette technology. It includes a pipette body with a negative pressure device inside. A connecting tube is installed at one end of the pipette body, and an extension tube is connected to one end of the connecting tube. The extension tube includes an inner tube and an outer tube. The outer tube is sleeved on the outer surface of the inner tube. A first limiting ring and a second limiting ring are fixedly installed on the surface of the inner tube. A groove is formed on the surface of the inner tube. A third limiting ring is fixedly installed on the surface of the outer tube. A locking block is fixedly installed on the inner wall of the outer tube. By employing a retractable inner-outer tube double-layer tube structure, and with the engagement of the first, second, and third limiting rings, the length of the extension tube can be flexibly adjusted.

Description

Technical Field

[0001] This utility model relates to the field of pipette technology, and in particular to a pipette extension device. Background Technology

[0002] When conducting biochemical tests, it is necessary to manually remove air bubbles from the surface of the liquid in the reagent bottle using a pipette before placing the reagents into the fully automated biochemical analyzer; otherwise, the experiment will be affected. When removing foam or drawing reagents using a pipette, the pipette tip is typically inserted into the reagent bottle, and then the tip is used to draw the foam or reagent from the bottle. Chinese Patent Publication No. CN217490930U discloses a pipette, including a pipette body with a negative pressure device inside, the negative pressure device being operable to blow and aspirate the liquid to be pipetted, and a connecting tube on the pipette body communicating with the negative pressure device; the pipette also includes: an extension tube detachably connected to the connecting tube; and a pipette tip detachably connected to the end of the extension tube away from the connecting port. In this existing design, although an extension tube can be added between the pipette body and the tip when the pipette body obscures the tip, thus separating the two and maximizing the field of view for observation, allowing surface air bubbles to be removed. Additionally, when some reagent bottles are deep, the pipette tip may not reach the bottom, preventing the reagent from being completely aspirated. Adding an extension tube would extend the tip further, allowing it to reach the bottom. However, existing pipette extension devices typically use a single fixed-length extension tube or a simple plug-in structure, which cannot flexibly adjust the length according to the depth of the reagent bottle, resulting in poor performance when handling extremely deep or shallow containers. Therefore, a pipette extension device is designed to solve the above problems. Utility Model Content

[0003] To address the problems mentioned in the background art, this utility model provides a pipette extension device with the feature of flexibly adjusting the length of the extension tube.

[0004] The present invention adopts the following technical solution: a pipette extension device, comprising a pipette body, wherein the pipette body has a negative pressure device, a connecting tube is installed at one end of the pipette body, and an extension tube is connected to one end of the connecting tube. The extension tube includes an inner tube and an outer tube, the outer tube is sleeved on the outer surface of the inner tube, a first limiting ring is fixedly installed on the surface of the inner tube, a second limiting ring is fixedly installed on the surface of the inner tube, a slot is formed on the surface of the inner tube, a third limiting ring is fixedly installed on the surface of the outer tube, and a locking block is fixedly installed on the inner wall of the outer tube.

[0005] As a preferred embodiment of the pipette extension device of this utility model, the number of connecting tubes is several groups, and the several groups of connecting tubes are distributed at equal intervals at one end of the pipette body.

[0006] As a preferred embodiment of the pipette extension device of this utility model, the connecting tube is connected to the negative pressure device inside the pipette body.

[0007] In a preferred embodiment of the pipette extension device of this utility model, the first limiting ring and the second limiting ring are respectively fixed to the top and bottom of the inner tube.

[0008] In a preferred embodiment of the pipette extension device of this utility model, the diameter of the first limiting ring is larger than the inner diameter of the outer tube, and the diameter of the second limiting ring is smaller than the inner diameter of the outer tube.

[0009] In a preferred embodiment of the pipette extension device of this utility model, the third limiting ring is fixed to the top end of the inner wall of the outer tube, and the diameter of the third limiting ring is smaller than the diameter of the second limiting ring.

[0010] As a preferred embodiment of the pipette extension device of this utility model, the number of slots is several sets, and the several sets of slots are evenly distributed on the outer surface of the inner tube.

[0011] In a preferred embodiment of the pipette extension device of this utility model, the position, shape, and size of the card block and the card slot are matched.

[0012] As a preferred embodiment of the pipette extension device of this utility model, the outer surface of the inner tube is provided with a graduated groove.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows: by adopting a telescopic inner tube-outer tube double-layer tube structure, and with the interlocking of the first limiting ring, the second limiting ring and the third limiting ring, the length of the extension tube can be flexibly adjusted. The equally spaced grooves on the surface of the inner tube and the locking blocks on the inner wall of the outer tube engage with each other, which can fix the extension tube in multiple preset positions during the extension and retraction process, avoiding accidental slippage during use. The top and bottom ends of the inner tube are respectively provided with the first limiting ring and the second limiting ring of different diameters, forming multiple limiting with the outer tube and the third limiting ring. This can prevent the inner tube from completely detaching from the outer tube and limit its excessive extension into the outer tube, thereby improving operational safety. The scale groove on the outer surface of the inner tube allows the user to intuitively read the current extension length, which is convenient for precise control of the depth of the nozzle into the liquid surface. It can adapt to reagent bottles of different depths, ensuring that the reagent at the bottom of the bottle is completely absorbed, and also provides a better field of vision when removing air bubbles from the liquid surface, avoiding obstruction. Attached Figure Description

[0014] Figure 1 This invention provides a schematic diagram of a pipette extension device; Figure 2 A partial schematic diagram of a pipette extension device is provided for this utility model; Figure 3 A schematic diagram of a pipette extension tube is provided for this utility model; Figure 4 A schematic diagram of the inner tube of a pipette extension device is provided for this utility model; Figure 5 This invention provides a schematic diagram of the outer tube of a pipette extension device.

[0015] Legend: 1. Pipette body; 2. Connecting tube; 3. Extension tube; 301. Inner tube; 302. Outer tube; 4. First limiting ring; 5. Second limiting ring; 6. Slot; 7. Third limiting ring; 8. Locking block; 9. Graduation groove. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Example 1 In existing technology, conventional pipettes include a pipette body with a negative pressure device operably used to blow and aspirate the liquid to be pipetted. The pipette body has a connecting tube that communicates with the negative pressure device. The pipette also includes an extension tube detachably connected to the connecting tube and a pipette tip detachably connected to the end of the extension tube away from the connecting port. This pipette allows for the addition of an extension tube between the pipette body and the pipette tip when the pipette body obstructs the tip's position, thus separating the pipette body and the tip and maximizing the available field of view for observation, allowing for the removal of surface air bubbles. Furthermore, when reagent bottles are deep, the pipette tip may not reach the bottom, preventing the reagent at the bottom from being completely aspirated. Therefore, adding an extension tube extends the pipette tip, allowing it to reach the bottom of the reagent bottle.

[0019] This application incorporates the aforementioned prior art, such as Figures 1 to 5 As shown, this utility model provides a technical solution: a pipette extension device, including a pipette body 1, a negative pressure device inside the pipette body 1, a connecting tube 2 installed at one end of the pipette body 1, an extension tube 3 connected to one end of the connecting tube 2, the extension tube 3 including an inner tube 301 and an outer tube 302, the outer tube 302 being sleeved on the outer surface of the inner tube 301, a first limiting ring 4 fixedly installed on the surface of the inner tube 301, a second limiting ring 5 fixedly installed on the surface of the inner tube 301, a slot 6 opened on the surface of the inner tube 301, a third limiting ring 7 fixedly installed on the surface of the outer tube 302, and a locking block 8 fixedly installed on the inner wall of the outer tube 302.

[0020] In this implementation scheme: by adopting a telescopic inner tube 301-outer tube 302 double-layer tube structure, and with the engagement of the first limiting ring 4, the second limiting ring 5 and the third limiting ring 7, the length of the extension tube 3 can be flexibly adjusted. The equally spaced grooves 6 on the surface of the inner tube 301 and the locking blocks 8 on the inner wall of the outer tube 302 engage with each other, which can fix the extension tube 3 in multiple preset positions during the extension and retraction process, avoiding accidental slippage during use. The top and bottom ends of the inner tube 301 are respectively provided with the first limiting ring 4 and the second limiting ring 5 of different diameters, which form multiple limits with the outer tube 302 and the third limiting ring 7. This can prevent the inner tube 301 from completely detaching from the outer tube 302, and also limit its excessive extension into the outer tube 302, thereby improving operational safety.

[0021] Combining the above solutions: Furthermore: like Figures 1 to 2 As shown; To improve pipetting efficiency, in one optional embodiment, the number of connecting tubes 2 is several sets, and the several sets of connecting tubes 2 are distributed at equal intervals at one end of the pipette body 1.

[0022] In this embodiment, there are several sets of connecting tubes 2, which are evenly distributed at one end of the pipette body 1. Multiple sets of connecting tubes 2 can enable multiple extension tubes 3 to work simultaneously, thereby improving pipetting efficiency.

[0023] Combining the above solutions: Furthermore: like Figures 1 to 2 As shown; To improve usability, in an optional embodiment, the connecting tube 2 is connected to the negative pressure device inside the pipette body 1.

[0024] In this embodiment, the connecting tube 2 is connected to the negative pressure device inside the pipette body 1, which can realize the effective transmission of negative pressure and ensure that the extension tube 3 can stably complete the liquid aspiration and discharge operations.

[0025] Combining the above solutions: Furthermore: like Figure 4 As shown; In an optional embodiment, to serve as a limiting device, the first limiting ring 4 and the second limiting ring 5 are respectively fixed to the top and bottom of the inner tube 301. The diameter of the first limiting ring 4 is larger than the inner diameter of the outer tube 302, and the diameter of the second limiting ring 5 is smaller than the inner diameter of the outer tube 302. The third limiting ring 7 is fixed to the top of the inner wall of the outer tube 302, and the diameter of the third limiting ring 7 is smaller than the diameter of the second limiting ring 5.

[0026] In this embodiment, the top and bottom ends of the inner tube 301 are respectively provided with a first limiting ring 4 and a second limiting ring 5 of different diameters, which together with the outer tube 302 and the third limiting ring 7 form multiple limiting, which can prevent the inner tube 301 from completely detaching from the outer tube 302 and limit its excessive extension into the outer tube 302, thereby improving operational safety.

[0027] Combining the above solutions: Furthermore: like Figure 4 As shown; To facilitate fixing the outer tube 302, in an optional embodiment, there are several sets of slots 6, which are evenly distributed on the outer surface of the inner tube 301.

[0028] In this embodiment, there are several sets of slots 6, which are evenly distributed on the outer surface of the inner tube 301. This allows the outer tube 302 to be fixed in multiple preset positions during the extension and retraction of the extension tube 3, thereby enabling flexible adjustment of the extension tube 3.

[0029] Combining the above solutions: Furthermore: like Figures 2 to 5 As shown; In order to fix the length of the extension tube 3, in an optional embodiment, the position, shape and size of the card block 8 and the card slot 6 are matched.

[0030] In this embodiment, the equally spaced slots 6 on the surface of the inner tube 301 engage with the locking blocks 8 on the inner wall of the outer tube 302, which can fix the extension tube 3 in multiple preset positions during the extension and retraction process, thus preventing accidental slippage during use.

[0031] Combining the above solutions: Furthermore: like Figure 4 As shown; In order to quickly adjust the length of the extension tube 3, in an optional embodiment, the outer surface of the inner tube 301 is provided with a scale groove 9.

[0032] In this embodiment, the scale groove 9 on the outer surface of the inner tube 301 allows the user to intuitively read the current length of the extension tube 3, which facilitates precise control of the depth into the liquid surface.

[0033] Working principle: When the length of the extension tube 3 needs to be adjusted, simply pull the outer tube 302 slightly to make it slide on the surface of the inner tube 301. At this time, the locking block 8 disengages from the initial locking groove 6 and moves to the lower locking groove 6. By observing the scale groove 9 exposed on the inner tube 301, the outer tube 302 can be slid quickly to make the extension tube 3 reach the required length. When it is moved to the required length, the locking block 8 is inserted into the locking groove 6 to fix the outer tube 302.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pipette extension device, comprising a pipette body (1), wherein the pipette body (1) has a negative pressure device, a connecting tube (2) is installed at one end of the pipette body (1), and an extension tube (3) is connected to one end of the connecting tube (2), characterized in that: The extension tube (3) includes an inner tube (301) and an outer tube (302). The outer tube (302) is sleeved on the outer surface of the inner tube (301). A first limiting ring (4) is fixedly installed on the surface of the inner tube (301). A second limiting ring (5) is fixedly installed on the surface of the inner tube (301). A slot (6) is opened on the surface of the inner tube (301). A third limiting ring (7) is fixedly installed on the surface of the outer tube (302). A locking block (8) is fixedly installed on the inner wall of the outer tube (302).

2. The pipette extension device according to claim 1, characterized in that: The number of connecting tubes (2) is several groups, and the several groups of connecting tubes (2) are distributed at equal intervals at one end of the pipette body (1).

3. The pipette extension device according to claim 2, characterized in that: The connecting tube (2) is connected to the negative pressure device inside the pipette body (1).

4. The pipette extension device according to claim 3, characterized in that: The first limiting ring (4) and the second limiting ring (5) are respectively fixed at the top and bottom of the inner tube (301).

5. The pipette extension device according to claim 4, characterized in that: The diameter of the first limiting ring (4) is greater than the inner diameter of the outer tube (302), and the diameter of the second limiting ring (5) is less than the inner diameter of the outer tube (302).

6. The pipette extension device according to claim 5, characterized in that: The third limiting ring (7) is fixed to the top of the inner wall of the outer tube (302), and the diameter of the third limiting ring (7) is smaller than the diameter of the second limiting ring (5).

7. The pipette extension device according to claim 6, characterized in that: The number of slots (6) is several groups, and the several groups of slots (6) are evenly distributed on the outer surface of the inner tube (301).

8. The pipette extension device according to claim 7, characterized in that: The position, shape and size of the card block (8) and the card slot (6) are matched.

9. The pipette extension device according to claim 8, characterized in that: The outer surface of the inner tube (301) is provided with a graduated groove (9).

Images