Serum transfer pipette
By introducing electric push rods and pistons into the serum pipette, the sampling process of automatically forming a negative pressure is realized, and the sealing structure prevents sample contamination, the problems of high manual operation error rate and sample contamination of traditional serum pipettes are solved, and sampling accuracy and working efficiency are improved.
Patent Information
- Application Number
- CN202421857438.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The manual operation error rate of traditional serum pipettes is high, the sampling volume is inaccurate, the operation is difficult, the work efficiency is low, and it is easy to cause sample contamination.
A serum pipette with an electric push rod and a piston was designed. The piston was driven to slide and formed a negative pressure through the electric push rod to achieve automatic sampling, and a sealing structure was set between the fixed tube and the reservoir tube to prevent sample contamination.
It improves the accuracy and working efficiency of sampling, reduces the difficulty of operation, and effectively prevents sample contamination, improving the practicality of the device.
Smart Images
Figure CN222872223U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipettes, in particular to a serum pipette. Background Art
[0002] A serological pipette is a laboratory tool used to accurately aspirate and release liquid samples. It is usually made of plastic or glass and has a slender tube and a tip. They play a key role in scientific research and clinical experiments. They are used to accurately move liquids such as serum and culture medium in different experimental operations to facilitate sample analysis, processing and experimental operations. The use of serological pipettes can ensure the accuracy and repeatability of experimental operations, providing necessary experimental tools for scientific research and clinical diagnosis.
[0003] The serological pipette controls the flow of liquid in and out by manually sucking or squeezing the tip. The operator gently presses the tip of the pipette with his fingers to create a negative pressure in the tube, thereby sucking up the liquid sample. By releasing the pressure of the fingers, the negative pressure in the tube disappears and the liquid sample can flow out freely. This simple mechanical principle makes the serological pipette a commonly used precision pipetting tool in the laboratory, which can be used for the distribution and transfer of various liquid samples.
[0004] However, the manual operation of traditional serological pipettes has a high error rate, which can easily cause inaccurate sampling volume and lead to biased results. It is also time-consuming and inefficient. Manual operation increases the contact area between the hand and the test tube, thereby increasing the probability of sample contamination. The pipette needs to be replaced to absorb samples of different volumes. It is not convenient to use and is difficult to operate. It depends entirely on the operator's skills. Therefore, a serological pipette is proposed. Utility Model Content
[0005] In order to make up for the above shortcomings, the utility model provides a serum pipette aimed at improving the problems of inaccurate manual sampling and low work efficiency caused by high operating difficulty in the prior art.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a serum pipette, comprising a negative pressure tube, a negative pressure cavity is opened inside the negative pressure tube, an electric push rod 1 is arranged inside the negative pressure tube, an output end of the electric push rod 1 is fixedly connected to a piston, an outer wall of the piston is slidably connected to the inner wall of the negative pressure cavity, a fixed tube is fixedly connected inside the negative pressure tube, a liquid storage tube is arranged inside the fixed tube, a flange is arranged on the upper surface of the liquid storage tube, a sliding block is arranged inside the fixed tube, a rubber block is fixedly connected to the inner wall of the fixed tube, the outer wall of the flange is slidably connected to the outer wall of the sliding block, the lower surface of the flange abuts against the upper surface of the rubber block, a sliding cylinder is slidably connected to the inner wall of the fixed tube, a fixing frame is fixedly connected inside the sliding cylinder, and a fixing component is arranged inside the sliding cylinder.
[0007] Furthermore, the fixing assembly comprises a fixing ring, an outer wall of the fixing ring is fixedly connected to the inner wall of the sliding cylinder, and a spring is arranged on one side of the outer wall of the fixing ring.
[0008] Furthermore, one end of the spring is fixedly connected to a fixing block, and the fixing block is slidably connected inside the sliding cylinder.
[0009] Furthermore, a second electric push rod is fixedly connected to the inner wall of the negative pressure tube, and an output end of the second electric push rod is fixedly connected to one side of the outer wall of the fixing frame.
[0010] Furthermore, a pointed tip is provided at one end of the liquid storage tube.
[0011] Furthermore, a handle is fixedly connected to the outer wall of the negative pressure tube, and a release button is provided on one side of the outer wall of the handle.
[0012] Furthermore, an adjustment key is provided on one side of the outer wall of the handle.
[0013] Furthermore, a battery block is fixedly connected inside the negative pressure tube.
[0014] The utility model has the following beneficial effects:
[0015] 1. In the utility model, the electric push rod drives the piston to discharge part of the air in the negative pressure chamber. After the liquid storage tube is installed, the electric push rod repeatedly drives the piston to slide, so that negative pressure is formed inside the negative pressure chamber. The negative pressure chamber and the liquid storage tube are both closed, so that the pointed tip can suck out the serum sample. The volume of the sample sucked is controlled by controlling the size of the negative pressure created by the piston, thereby achieving the effect of automatic sampling, improving the accuracy of sampling, reducing the difficulty of operating the device, and improving work efficiency.
[0016] 2. In the utility model, a sliding block is arranged inside the fixed tube to engage the flange, thereby facilitating the installation and disassembly of the liquid storage tube. A fixing ring and a fixing block are arranged inside the sliding tube. The spring is subjected to a certain pressure to separate the space inside the negative pressure chamber and the liquid storage tube, thereby preventing the sample from contaminating the internal environment of the negative pressure chamber and improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a three-dimensional structural diagram of a serum pipette proposed by the utility model;
[0018] Figure 2 This is a schematic structural diagram of the piston portion of a serum pipette proposed by the utility model;
[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0020] Legend:
[0021] 1. Negative pressure tube; 2. Battery block; 3. Electric push rod 1; 4. Piston; 5. Negative pressure chamber; 6. Fixed tube; 7. Liquid storage tube; 8. Flange; 9. Sliding block; 10. Rubber block; 11. Sliding cylinder; 12. Fixed frame; 13. Electric push rod 2; 14. Tip; 15. Grip; 16. Release button; 17. Adjustment button; 18. Fixed ring; 19. Spring; 20. Fixed block. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] Reference Figure 1 , Figure 2 and Figure 3 An embodiment of the utility model is as follows: a serum pipette comprises a negative pressure tube 1, a negative pressure cavity 5 is provided inside the negative pressure tube 1, an electric push rod 3 is arranged inside the negative pressure tube 1, a piston 4 is fixedly connected to the output end of the electric push rod 3, the outer wall of the piston 4 is slidably connected to the inner wall of the negative pressure cavity 5, a fixed tube 6 is fixedly connected inside the negative pressure tube 1, a liquid storage tube 7 is arranged inside the fixed tube 6, a flange 8 is arranged on the upper surface of the liquid storage tube 7, a sliding block 9 is arranged inside the fixed tube 6, a rubber block 10 is fixedly connected to the inner wall of the fixed tube 6, the outer wall of the flange 8 is slidably connected to the outer wall of the sliding block 9, the lower surface of the flange 8 abuts against the upper surface of the rubber block 10, a sliding cylinder 11 is slidably connected to the inner wall of the fixed tube 6, a fixing frame 12 is fixedly connected to the inside of the sliding cylinder 11, and a fixing component is arranged inside the sliding cylinder 11.
[0024] Specifically, the electric push rod 1 3 drives the piston 4 to slide inside the negative pressure chamber 5 to form a negative pressure environment, instead of manually creating negative pressure, avoiding errors during manual operation, improving accuracy, and improving work efficiency. The flange 8 is stuck in the sliding block 9 set inside the fixed tube 6, and the rubber block 10 increases the sealing between the flange 8 and the fixed tube 6. When the sampling is completed, the electric push rod 2 13 pushes the sliding cylinder 11 to squeeze the sliding block 9 so that the liquid storage tube 7 can be easily taken out, which reduces the difficulty of operation and improves the practicability of the device.
[0025] Reference Figure 1 and Figure 2The fixing assembly includes a fixing ring 18, the outer wall of the fixing ring 18 is fixedly connected to the inner wall of the sliding cylinder 11, a spring 19 is arranged on one side of the outer wall of the fixing ring 18, one end of the spring 19 is fixedly connected to a fixing block 20, the fixing block 20 is slidably connected inside the sliding cylinder 11, an electric push rod 2 13 is fixedly connected to the inner wall of the negative pressure tube 1, the output end of the electric push rod 2 13 is fixedly connected to one side of the outer wall of the fixing frame 12, a pointed head 14 is arranged at one end of the liquid storage tube 7, a handle 15 is fixedly connected to the outer wall of the negative pressure tube 1, a release button 16 is arranged on one side of the outer wall of the handle 15, an adjustment button 17 is arranged on one side of the outer wall of the handle 15, and a battery block 2 is fixedly connected inside the negative pressure tube 1.
[0026] Specifically, different adjustment keys 17 are provided on the handle 15 to control the amount of air discharged by the piston 4, thereby determining the sample volume absorbed by the liquid storage tube 7, thereby improving the practicality of the device and avoiding frequent replacement of pipettes. When the staff moves the device, they cannot ensure that the liquid storage tube 7 is always vertical to the ground. In this case, the sample liquid may flow into the negative pressure chamber 5 and pollute the internal environment of the negative pressure chamber 5. Therefore, a fixing ring 18 and a fixing block 20 are provided inside the sliding cylinder 11. When the fixing block 20 senses a certain pressure, the spring 19 is compressed to cause the fixing block 20 to block the opening inside the fixing ring 18, thereby achieving the effect of separating the negative pressure chamber 5 and the liquid storage tube 7, thereby improving the practicality of the device.
[0027] Working principle: when the serum pipette is needed, first push the liquid storage tube 7 into the fixed tube 6, so that the flange 8 pushes the sliding block 9, so that the sliding block 9 slides to the inside of the fixed tube 6, thereby being stuck on the inner side of the rubber block 10, so that a sealed environment is formed between the flange 8 and the fixed tube 6. After installing the liquid storage tube 7, the negative pressure strength inside the negative pressure tube 1 is adjusted by pressing the adjustment key 17 on the grip 15. Different liquid storage tubes 7 represent different volumes of serum that can be taken by the liquid storage tube 7 later, so as to achieve the effect of automatic sampling and improve the accuracy and work efficiency of sampling work. The electric push rod 3 pushes the piston 4 to stop at different positions inside the negative pressure chamber 5 according to different sampling volumes, so as to achieve the effect of increasing the flexibility of the device. After the air is exhausted, one end of the tip 14 is aligned with the vessel where the serum needs to be taken. At this time, the electric push rod 3 will drive the piston 4 back to its original position, so that the negative pressure The negative pressure state inside the cavity 5 will cause the liquid storage tube 7 to automatically absorb the sample, reducing the difficulty of operation. Since the staff cannot always keep the device vertical to the ground, it will occasionally tilt. In order to prevent the sample from flowing back into the negative pressure cavity 5, a fixing ring 18 and a fixing block 20 are arranged inside the sliding cylinder 11. When the fixing block 20 is subjected to a specified pressure, the spring 19 will be compressed, so that the fixing block 20 blocks the opening inside the spring 19, thereby preventing the sample from flowing back into the negative pressure cavity 5 and polluting the internal environment of the negative pressure cavity 5. After the sampling is completed, the electric push rod 13 pushes the sliding cylinder 11 connected to the fixed frame 12 so that the sliding cylinder 11 squeezes the sliding block 9, so that the liquid storage tube 7 can be easily taken out, thereby improving the work efficiency. The material of the liquid storage tube 7 is glass, which can be sterilized and reused to avoid waste, and the wall is provided with scales to increase the accuracy of sample absorption.
[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A serological pipette, comprising a negative pressure tube (1), characterized in that: A negative pressure chamber (5) is provided inside the negative pressure tube (1), an electric push rod (3) is provided inside the negative pressure tube (1), an output end of the electric push rod (3) is fixedly connected to a piston (4), an outer wall of the piston (4) is slidably connected to the inner wall of the negative pressure chamber (5), a fixed tube (6) is fixedly connected inside the negative pressure tube (1), a liquid storage tube (7) is provided inside the fixed tube (6), a flange (8) is provided on the upper surface of the liquid storage tube (7), a sliding block (9) is provided inside the fixed tube (6), a rubber block (10) is fixedly connected to the inner wall of the fixed tube (6), the outer wall of the flange (8) is slidably connected to the outer wall of the sliding block (9), the lower surface of the flange (8) abuts against the upper surface of the rubber block (10), a sliding cylinder (11) is slidably connected to the inner wall of the fixed tube (6), a fixing frame (12) is fixedly connected to the inside of the sliding cylinder (11), and a fixing component is provided inside the sliding cylinder (11).
2. A serological pipette according to claim 1, characterized in that: The fixing assembly comprises a fixing ring (18), the outer wall of the fixing ring (18) is fixedly connected to the inner wall of the sliding cylinder (11), and a spring (19) is arranged on one side of the outer wall of the fixing ring (18).
3. A serological pipette according to claim 2, characterized in that: One end of the spring (19) is fixedly connected to a fixing block (20), and the fixing block (20) is slidably connected inside the sliding cylinder (11).
4. A serological pipette according to claim 1, characterized in that: The inner wall of the negative pressure tube (1) is fixedly connected to a second electric push rod (13), and the output end of the second electric push rod (13) is fixedly connected to one side of the outer wall of the fixing frame (12).
5. A serological pipette according to claim 1, characterized in that: One end of the liquid storage tube (7) is provided with a pointed tip (14).
6. A serological pipette according to claim 1, characterized in that: A handle (15) is fixedly connected to the outer wall of the negative pressure tube (1), and a release button (16) is provided on one side of the outer wall of the handle (15).
7. A serological pipette according to claim 6, characterized in that: An adjustment key (17) is provided on one side of the outer wall of the handle (15).
8. A serological pipette according to claim 1, characterized in that: A battery block (2) is fixedly connected inside the negative pressure tube (1).