Multi-path liquid taking head and pipette thereof

Abstract

The utility model provides a multipath liquid taking head. The multipath liquid taking head comprises a connecting part, a transition part and a liquid taking part, the connecting part is used for being connected with a pipette head of a pipette body, and the bottom of the connecting part is detachably connected with a transition part for preventing liquid from flowing back; the bottom of the transition part is detachably connected with a liquid suction head; the connecting part comprises a plurality of sleeves which are integrally formed and have different diameters, and is used for connecting the pipettes with different specifications and models; by designing the multi-diameter liquid taking head connecting part comprising a plurality of sleeves with different diameters, the technical scheme can be adapted to most specifications of pipettes on the market, and the universality and the flexibility of the liquid taking head are greatly improved; laboratory personnel do not need to purchase liquid taking heads of various specifications for different types of pipettes, so that the experiment cost and the management difficulty are reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical pipettes, and in particular to a multi-diameter pipette head and the same. Background Technology

[0002] As an indispensable precision instrument in the laboratory, the core function of a pipette is to achieve the precise transfer of micro-volume liquids through its pick-up tip. The pick-up tip, as the part of the pipette that comes into direct contact with the liquid sample, directly affects the accuracy, efficiency, and safety of the pipetting process.

[0003] Traditional pipette tips are usually made of plastic and designed in standard sizes or a limited number of sizes to accommodate pipettes of different capacities. These tips are usually for single use to ensure cleanliness in the laboratory and avoid cross-contamination. However, with the increasing diversification of scientific research needs, the design of traditional tips has gradually revealed some limitations.

[0004] On the one hand, the specifications of traditional liquid dispensing tips are limited, and they often cannot perfectly fit all models of pipettes, which limits the versatility and flexibility of pipettes; laboratory personnel may need to equip different types of pipettes with different specifications of liquid dispensing tips, which not only increases experimental costs, but also brings management inconvenience.

[0005] On the other hand, the performance of traditional sampling tips in preventing contamination and leakage still needs improvement. Although disposable sampling tips help reduce the risk of cross-contamination, when handling high-concentration, highly toxic, or highly infectious samples, if the connection between the sampling tip and the pipette is not sealed properly, or if the sampling tip itself is defective, sample leakage or aerosol contamination may still occur, posing a potential threat to laboratory personnel and the laboratory environment. Utility Model Content

[0006] To address the problems of specification compatibility and anti-contamination performance of traditional pipette tips in the prior art, this utility model provides a multi-diameter pipette tip and its pipette.

[0007] The multi-diameter liquid sampling head and its pipette provided by this utility model adopt the following technical solution:

[0008] On one hand, a multi-diameter liquid dispensing head includes a connecting part, a transition part, and a liquid dispensing part; the connecting part is used to connect to the liquid suction head of the pipette body, and the bottom is detachably connected to the transition part for preventing liquid backflow; the bottom of the transition part is detachably connected to the liquid suction head; the connecting part includes several integrally formed sleeves of different diameters for connecting pipettes of different specifications and models.

[0009] Furthermore, the transition section includes a connecting cylinder; the top of the connecting cylinder is connected to the connecting part by a thread; the bottom of the connecting cylinder is connected to the liquid taking part by a thread; a filter membrane is fixedly connected to the inner wall of the transition section;

[0010] Furthermore, the filter membrane is a PTFE membrane with a pore size range of 0.22μm-0.45μm, used to prevent aerosols or particles from flowing back and contaminating the pipette;

[0011] Furthermore, the outer wall of the connecting cylinder is integrally formed with an annular protrusion, and the outer wall of the annular protrusion is provided with an anti-slip pattern.

[0012] Furthermore, the connecting part includes at least two sleeves with different diameters; the diameter of all the sleeves decreases sequentially from top to bottom; the lowermost sleeve is connected to the transition part; the transition between the inner walls of each sleeve is chamfered; each inner wall of the sleeve is provided with a plurality of sealing rings; the cross-section of the sealing ring is semi-circular.

[0013] Furthermore, each of the sleeves has at least two sealing rings fixedly connected to its inner wall; the diameter of the sealing rings in each sleeve increases sequentially from top to bottom.

[0014] Furthermore, the sealing ring is made of thermoplastic elastomer;

[0015] Furthermore, the liquid collection part includes at least two integrally formed liquid collection tubes with gradually changing diameters; each liquid collection tube extends downward in an inverted cone shape, and the transition between the inner sidewalls of each liquid collection tube is rounded.

[0016] Furthermore, the inner wall of the liquid collection section is coated with a hydrophobic layer; the hydrophobic layer is a silicon oxide-polytetrafluoroethylene composite material.

[0017] On the other hand, a pipette includes a pipette body, the bottom of which is provided with a suction head, which is connected to the aforementioned multi-diameter suction head.

[0018] In summary, the beneficial effects of this utility model are as follows:

[0019] This invention, through the design of a multi-diameter liquid-collecting head connection part containing multiple sleeves of different diameters, can be adapted to most specifications of pipettes on the market, greatly improving the versatility and flexibility of the liquid-collecting head; laboratory personnel no longer need to purchase multiple specifications of liquid-collecting heads for different types of pipettes, reducing experimental costs and management difficulty.

[0020] In addition, a filter membrane is fixedly installed on the inner wall of the transition section, which effectively blocks the risk of aerosol or particle backflow contaminating the pipette. This design not only improves the safety of the experimental process, but also helps to protect the pipette from contamination and extend its service life. At the same time, the inner wall of the liquid dispensing section is coated with a hydrophobic layer, which further reduces liquid residue and lowers the possibility of cross-contamination. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall internal structure of this utility model;

[0023] Figure 3 This utility model Figure 2 An enlarged schematic diagram of part A in the middle;

[0024] Figure 4 This utility model Figure 2 Enlarged schematic diagram of part B in the middle;

[0025] Figure 5 This utility model Figure 2 An enlarged schematic diagram of section C;

[0026] Figure 6 This is a schematic diagram showing the connection between the present invention and a pipette.

[0027] As shown in the figure: 1-pipette body, 11-absorption head, 2-connecting part, 21-sleeve, 22-chamfer, 23-sealing ring, 3-transition part, 31-connecting cylinder, 32-filter membrane, 33-annular protrusion, 4-liquid collection part, 41-liquid collection tube, 42-rounded corner. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 The present invention will be further described in detail below:

[0029] This utility model discloses a multi-diameter liquid dispensing head and its pipette, on the one hand, such as Figure 1 , 2As shown, a multi-diameter liquid dispensing head includes a connecting part 2, a transition part 3, and a dispensing part 4. The connecting part 2 is used to connect to the suction head 11 of the pipette body 1, and the bottom is detachably connected to the transition part 3 to prevent backflow of liquid. The bottom of the transition part 3 is detachably connected to the suction head 11. The connecting part 2 includes several integrally formed sleeves 21 of different diameters for connecting pipettes of different specifications and models. In this embodiment, functional decoupling is achieved through the detachable connecting part 2, transition part 3, and dispensing part 4. The connecting part 2 is adapted to different pipette specifications, the transition part 3 is responsible for preventing backflow, and the dispensing part 4 is responsible for liquid aspiration. The transition part 3 physically blocks the backflow of aerosols or particles while allowing liquid to pass through in one direction. The multi-diameter sleeves 21 of the connecting part 2 are designed to adapt to various pipette specifications, reducing the cost of frequent replacement of consumables. The transition part 3 effectively blocks aerosols or particles from entering the pipette interior, avoiding cross-contamination and improving experimental safety.

[0030] like Figure 4 As shown, the transition section 3 includes a connecting cylinder 31; the top of the connecting cylinder 31 is connected to the connecting section 2 via threads; the bottom of the connecting cylinder 31 is connected to the liquid dispensing section 4 via threads; a filter membrane 32 is fixedly connected to the inner wall of the transition section 3; the filter membrane 32 is a PTFE membrane with a pore size range of 0.22μm-0.45μm, used to prevent aerosols or particles from backflowing and contaminating the pipette; in this embodiment, the connecting cylinder 31 is fixed to the connecting section 2 via a top thread, and the liquid dispensing section 4 is fixed to the bottom thread, achieving modular assembly; the PTFE filter membrane 32 has a pore size of 0.22μm-0.45μm. μm, utilizing the principle of physical sieving, it blocks particles or aerosols ≥0.22μm while allowing liquids and air to pass through; effectively intercepting airborne particles, aerosols, or contaminants in samples, protecting the cleanliness of the pipette's interior; the pore size of the filter membrane 32 is selected to balance air permeability and barrier properties, avoiding excessive pipetting resistance due to pressure differences; the threaded connection structure ensures the firmness of the transition part 3, the connecting part 2, and the liquid-taking part 4, preventing detachment during operation; among them, PTFE material, also known as polytetrafluoroethylene, has chemical inertness, hydrophobicity, and high temperature resistance, making it suitable for biological and chemical experimental scenarios;

[0031] like Figure 4 As shown, the outer wall of the connecting cylinder 31 is integrally formed with an annular protrusion 33, and the outer wall of the annular protrusion 33 is provided with an anti-slip pattern; in this embodiment, the annular protrusion 33 and the pattern increase the friction of the hand, making it easy to tighten or loosen the threaded connection by hand; the assembly and disassembly of the transition part 3 can be completed by hand without the aid of tools, thus improving experimental efficiency;

[0032] like Figure 2 , 3As shown, the connecting part 2 includes at least two sleeves 21 with different diameters; the diameter of all sleeves 21 decreases from top to bottom; the lowermost sleeve 21 is connected to the transition part 3; the transition between the inner walls of each sleeve 21 is chamfered 22; each inner wall of each sleeve 21 is provided with several sealing rings 23; the cross-section of the sealing ring 23 is semi-circular; at least two sealing rings 23 are fixedly connected to the inner wall of each sleeve 21; the diameter of the sealing rings 23 in each sleeve 21 increases from top to bottom. The sealing ring 23 is made of thermoplastic elastomer. In this embodiment, thermoplastic elastomers, such as TPE and TPU, have high elasticity and wear resistance. After being compressed, they deform to fill the gap between the pipette tip 11 and the sleeve 21. The diameter of the sealing ring 23 increases from top to bottom to adapt to the taper of different pipette tips 11, ensuring airtightness. The surface energy of the elastomer material is low, reducing sample residue. The sealing ring 23 with a gradually changing diameter can adapt to the taper differences of different specifications of pipette tips 11, expanding compatibility.

[0033] like Figure 2 , 5 As shown, the liquid collection section 4 includes at least two integrally formed liquid collection tubes 41 with gradually decreasing diameters; each liquid collection tube 41 extends downward in an inverted cone shape, and the transition between the inner walls of each liquid collection tube 41 is a rounded corner 42; in this embodiment, the diameter of the liquid collection tube 41 gradually decreases from top to bottom, forming a gradient structure to adapt to the liquid extraction needs at different depths; the rounded corner 42 design of the inner wall reduces liquid turbulence and avoids the generation of bubbles or splashing; the rounded corner 42 transition can also reduce the adhesion of liquid to the tube wall and reduce dead volume;

[0034] The inner wall of the liquid collection section 4 is coated with a hydrophobic layer (not shown in the figure); the hydrophobic layer is a silicon dioxide-polytetrafluoroethylene composite material; in this embodiment, silicon dioxide provides adhesion to the substrate, and polytetrafluoroethylene imparts extremely low surface energy, forming a hydrophobic interface; the hydrophobic layer reduces the contact area between the liquid and the tube wall, reducing the risk of sample residue and cross-contamination; this composite material is resistant to acids, alkalis, and organic solvents, and is suitable for complex experimental environments; it significantly reduces the adsorption of liquid on the tube wall, and is especially suitable for high-concentration samples or viscous liquids;

[0035] like Figure 1 As shown, a pipette includes a pipette body 1, and a suction head 11 is provided at the bottom of the pipette body 1. The suction head 11 is connected to the aforementioned multi-diameter liquid collection head.

[0036] With the multi-diameter sleeve 21 and the gradient liquid collection tube 41, it covers a variety of pipette specifications and container types;

[0037] The PTFE filter membrane features a 32+ hydrophobic layer for dual protection, preventing contamination from aerosols, particulate matter, and sample residues.

[0038] Optimized structures such as chamfered transition 22, rounded corner design 42, and sealing ring 23 reduce dead volume and liquid residue;

[0039] Modular design, anti-slip threads, and chemically inert materials extend product life and reduce maintenance difficulty;

[0040] This liquid dispensing head, through structural innovation and material optimization, solves the pain points of traditional pipette consumables, such as poor compatibility, high risk of contamination, and high maintenance costs, and has significant market competitiveness.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-diameter liquid sampling head, characterized in that: It includes a connecting part (2), a transition part (3), and a liquid taking part (4); the connecting part (2) is used to connect to the liquid suction head (11) of the pipette body (1), and the bottom is detachably connected to the transition part (3) to prevent liquid backflow; the bottom of the transition part (3) is detachably connected to the liquid suction head (11); the connecting part (2) includes several integrally formed sleeves (21) of different diameters for connecting pipettes of different specifications and models.

2. A multi-diameter liquid sampling head according to claim 1, characterized in that... The transition section (3) includes a connecting cylinder (31); the top of the connecting cylinder (31) is connected to the connecting section (2) by a thread; the bottom of the connecting cylinder (31) is connected to the liquid taking section (4) by a thread; and a filter membrane (32) is fixedly connected to the inner wall of the transition section (3).

3. A multi-diameter liquid sampling head according to claim 2, characterized in that... The filter membrane (32) is a PTFE membrane with a pore size range of 0.22μm-0.45μm, used to prevent aerosols or particles from flowing back and contaminating the pipette.

4. A multi-diameter liquid sampling head according to claim 2, characterized in that... The outer wall of the connecting cylinder (31) is integrally formed with an annular protrusion (33), and the outer wall of the annular protrusion (33) is provided with an anti-slip pattern.

5. A multi-diameter liquid sampling head according to claim 1, characterized in that... The connecting part (2) includes at least two sleeves (21) with different diameters; the diameter of all the sleeves (21) decreases from top to bottom; the lowermost sleeve (21) is connected to the transition part (3); the transition between the inner walls of each sleeve (21) is chamfered (22); each inner wall of the sleeve (21) is provided with several sealing rings (23); the cross-section of the sealing ring (23) is semi-circular.

6. A multi-diameter liquid sampling head according to claim 5, characterized in that... Each sleeve (21) has at least two sealing rings (23) fixedly connected to its inner wall; the diameter of the sealing rings (23) in each sleeve (21) increases sequentially from top to bottom.

7. A multi-diameter liquid sampling head according to claim 6, characterized in that... The sealing ring (23) is made of thermoplastic elastomer.

8. A multi-diameter liquid sampling head according to claim 1, characterized in that... The liquid collection part (4) includes at least two integrally formed liquid collection tubes (41) with gradually changing diameters; each liquid collection tube (41) extends downward in an inverted cone shape, and the transition between the inner sidewalls of each liquid collection tube (41) is rounded (42).

9. A multi-diameter liquid sampling head according to claim 8, characterized in that... The inner wall of the liquid collection part (4) is coated with a hydrophobic layer; the hydrophobic layer is a silicon oxide-polytetrafluoroethylene composite material.

10. A pipette, comprising a pipette body (1), wherein a suction head (11) is provided at the bottom of the pipette body (1), characterized in that: The suction head (11) is connected to any one of the multi-diameter suction heads described in claims 1-9.

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