Disposable double-quantitative function pipetting suction tube

Abstract

The utility model discloses a disposable double-quantitative function pipette which comprises a body, a first air bag part and a second air bag part, and any one of the first air bag part and the second air bag part is detachably and independently arranged at the top end of the body in a sleeving mode. Or the second air bag part is detachably sleeved on the first air bag part, so that the inner cavity of the first air bag part is communicated with the inner cavity of the second air bag part through the air hole; a liquid guide pipe which extends from the top end of the body to the bottom end in the length direction is formed in the body, the liquid guide pipe is divided into a first liquid suction section with small diameter width and a second liquid suction section with large diameter width from bottom to top, and the liquid suction volume of the first liquid suction section corresponds to the use state that the first air bag part or the second air bag part is independently arranged on the body in a sleeving mode; the sum of the liquid suction volume of the first liquid suction section and the liquid suction volume of the second liquid suction section corresponds to the using state that the first air bag part and the second air bag part are combined and arranged on the body in a sleeving mode.

Description

Technical Field

[0001] The utility model relates to the technical field of pipetting devices, in particular to a disposable double-quantitative pipetting straw with a dual quantitative function. Background Art

[0002] In the fields of biology, chemistry, and medical testing, the commonly used pipetting straws on the market use an airbag to suck liquid. By pressing the airbag, the air in the pipetting straw is discharged, making the inside of the pipetting straw in a negative pressure state. At this time, the liquid suction port of the pipetting straw is immersed in the liquid to be measured; then the airbag is released, and the liquid to be measured enters the pipetting straw from the liquid suction port under the action of atmospheric pressure; after the liquid suction is completed, pressing the airbag again can discharge the liquid to be measured in the pipetting straw to complete the pipetting operation.

[0003] In response to this problem, the applicant has applied for a related patent for "a disposable quantitative pipetting sampler". Through the self-priming action of the capillary, a quantitative sampling liquid is sucked into the liquid storage cavity, and by pressing the piston rod, the sampling liquid stored in the liquid storage cavity can be pushed out and dropped to the designated position. The sampling process is simple and fast, reducing the use of other equipment such as pipettes and saving costs; this method has a good effect on quantitative collection, but for collection working conditions with different collection volume requirements, pipetting samplers of different specifications need to be used. Therefore, the user needs to purchase pipetting samplers of multiple specifications (such as different specifications of 10 μL and 60 μL), which undoubtedly increases the procurement cost of the user and is inconvenient to use and prone to confusion. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multi-functional quantitative pipetting straw with flexible and rich functions and accurate pipetting.

[0005] To achieve the above purpose, the utility model provides 1. A disposable double-quantitative pipetting straw, comprising a body, a first airbag part, and a second airbag part. Among them, both the first airbag part and the second airbag part have the characteristic of elastic deformation under pressure. An air-permeable hole communicating with the external air environment is formed in the inner cavity of the first airbag part; either the first airbag part or the second airbag part can be detachably and independently sleeved on the top of the body, or the second airbag part is detachably sleeved on the first airbag part so that the inner cavity of the first airbag part communicates with the inner cavity of the second airbag part through the air-permeable hole; a liquid guide tube extending from the top to the bottom along the length direction is formed inside the body. Among them, the liquid guide tube is divided into a first liquid suction section with a small diameter and a second liquid suction section with a large diameter from bottom to top. The liquid suction volume of the first liquid suction section corresponds to the use state where the first airbag part or the second airbag part is independently sleeved on the body; the sum of the liquid suction volumes of the first liquid suction section and the second liquid suction section corresponds to the use state where the first airbag part and the second airbag part are combined and sleeved on the body.

[0006] Further, a liquid separation and breathable membrane is provided at the upper port of the liquid guide tube.

[0007] Further, an overflow chamber that can communicate with the inner cavity of the first airbag portion or the inner cavity of the second airbag portion is formed at the top end of the main body. Among them, there is a height difference between the upper port of the liquid guide tube and the bottom surface of the overflow chamber.

[0008] Further, the air vent holes are opened at the top end position or the side peripheral surface position of the first airbag portion.

[0009] Further, an annular portion that is snap-fitted with an annular card slot preset on the outer peripheral surface of the top end of the main body is formed on the inner peripheral surface of the first airbag portion or the second airbag portion.

[0010] Further, the annular portion on the inner peripheral surface of the second airbag portion can be in sealed contact with the outer wall of the first airbag portion.

[0011] By adopting the above solution, the beneficial effects of the present utility model are as follows: By adopting the above structure, when the present utility model is in use, the first airbag portion or the second airbag portion can be independently sleeved on the main body to achieve the effect of quantitative collection; in addition, the first airbag portion and the second airbag portion can also be combined and sleeved on the main body, and the effect of quantitative collection can also be achieved; thus, it can be seen that by independently or combinatorially sleeving the first airbag portion and the second airbag portion on the main body, the present utility model can realize quantitative collection of different specifications (small, large), with flexible and rich functions, meet the collection working conditions with different collection volume requirements, reduce the specification quantity of pipette straws or other pipetting devices, and reduce costs; and the structure is simple and compact, which is convenient for use and promotion. Description of the Drawings

[0012] Figure 1-2 It is a schematic diagram of the separate sleeving of the main body and the first airbag portion.

[0013] Figure 3-4 It is a schematic diagram of the separate sleeving of the main body and the second airbag portion.

[0014] Figure 5-6 It is a schematic diagram of the air vent holes opened at the side peripheral surface position.

[0015] Figure 7-8 It is a schematic diagram of the combined sleeving of the main body, the first airbag portion and the second airbag portion.

[0016] Among them, 1 - main body, 11 - liquid guide tube, 111 - first liquid suction section, 112 - second liquid suction section, 12 - liquid separation and breathable membrane, 13 - overflow chamber, 2 - first airbag portion, 3 - second airbag portion, 21 - air vent holes. Detailed Embodiments

[0017] For ease of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the accompanying drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0018] See the attached Figure 1-8 As shown, in this embodiment, a disposable double-quantitative pipette includes a main body 1, a first airbag part 2 and a second airbag part 3. Among them, both the first airbag part 2 and the second airbag part 3 have an inner cavity structure with an opening at the lower part. Both the first airbag part 2 and the second airbag part 3 have the characteristic of pressing elastic deformation, so that after the first airbag part 2 and / or the second airbag part 3 are correspondingly installed on the main body 1, the user can press or release the first airbag part 2 or the second airbag part 3 to achieve the liquid suction or liquid extrusion operation.

[0019] In this embodiment, any one of the first airbag part 2 and the second airbag part 3 can be detachably and independently sleeved on the top of the main body 1. Among them, an annular part is formed on the inner peripheral surface of the first airbag part 2 or the second airbag part 3 of this embodiment, which is clamped with an annular groove preset on the outer peripheral surface of the top of the main body 1, that is: through the clamping cooperation of the annular part and the annular groove, the first airbag part 2 or the second airbag part 3 can be correspondingly sealed and fixed at the top of the main body 1, and the installation is convenient and fast. When disassembly is required, the first airbag part 2 or the second airbag part 3 can be easily pulled off.

[0020] For ease of explanation, in combination with the specific attached Figure 1-6 Make a specific explanation of the above-mentioned first airbag part 2 or the second airbag part 3 sleeved on the top of the main body 1. As Figure 1-2 shown, select the first airbag part 2 to be correspondingly sleeved on the top of the main body 1; it can also be as Figure 3-4 shown, select the second airbag part 3 to be correspondingly sleeved on the top of the main body 1; the user can correspondingly select the appropriate first airbag part 2 or the second airbag part 3 according to the actual liquid transfer volume requirement. The first airbag part 2 and the second airbag part 3 of this embodiment can respectively correspond to different liquid suction volume requirements.

[0021] In this embodiment, air vent holes 21 communicating with the external air environment are formed in the inner cavity of the first airbag part 2. Among them, the air vent holes 21 are opened at the top or the side peripheral surface of the first airbag part 2. It can be as shown in the attached Figure 1-4 where the air vent holes 21 are opened at the top of the first airbag part 2. In this way, when the user pinches the first airbag part 2 for the liquid extrusion operation, another finger needs to be used to press and block the air vent holes 21; it can also be as shown in the attached Figure 5 and 6The vent hole 21 shown is opened at the side circumferential surface position of the first airbag portion 2. In this way, it is more adaptable to the actual operation actions, that is: when the user squeezes the liquid by pinching the first airbag portion 2, the hand just presses and blocks the vent hole 21. Those skilled in the art can adjust the opening position of the vent hole 21 according to the actual production situation.

[0022] In this embodiment, the second airbag portion 3 is not provided with a vent hole 21. It is sleeved on the body 1 to enclose a relatively airtight cavity space. The liquid suction operation can be achieved by pre-pressing the second airbag portion 3 to discharge the air in the cavity space and then releasing the hand. Conversely, the sucked sample liquid can be squeezed out by pressing the second airbag portion 3.

[0023] In this embodiment, in addition to the above-mentioned separate sleeving method, it can also be in the combined sleeving method as shown in the appendix Figure 7-8 Specifically, the second airbag portion 3 is detachably sleeved on the first airbag portion 2 so that the inner cavity of the first airbag portion 2 communicates with the inner cavity of the second airbag portion 3 through the vent hole 21 (at this time, the second airbag portion 3 wraps and covers the vent hole 21 of the first airbag portion 2 in its inner cavity), so as to make the first airbag portion 2 and the second airbag portion 3 form a larger cavity, which is convenient for increasing the liquid suction volume. Further, when the combined sleeving method is adopted, the annular portion on the inner circumferential surface of the second airbag portion 3 can be in sealed contact with the outer wall of the first airbag portion 2, so as to ensure that the first airbag portion 2 and the second airbag portion 3 enclose a larger airtight cavity; similarly, when it needs to be disassembled, the second airbag portion 3 can be easily pulled off.

[0024] In this embodiment, a liquid guide tube 11 is formed inside the body 1 and extends from its top end to the bottom end along the length direction. Among them, the liquid guide tube 11 is divided into a first liquid suction section 111 with a small diameter width and a second liquid suction section 112 with a large diameter width from bottom to top. Here, the diameter width and depth of the first liquid suction section 111 and the second liquid suction section 112 are determined according to the actual liquid transfer volume. Those skilled in the art can set appropriate size specifications, and no specific limitations are made here. For the convenience of understanding, the following specifically explains the above-mentioned liquid guide tube 11 in combination with the above-mentioned separate sleeving or combined sleeving methods.

[0025] Refer to the appendix Figure 1-6 Shown in the separate sleeving method, the liquid suction volume of the first liquid suction section 111 corresponds to the use state of the first airbag portion 2 or the second airbag portion 3 sleeved on the body 1 independently, that is: because the first airbag portion 2 or the second airbag portion 3 corresponds to the liquid suction volume of the first liquid suction section 111, when the user gently holds the first airbag portion 2 or presses the second airbag portion 3 for the liquid suction operation, the sample liquid can only be sucked into the first liquid suction section 111. Refer to the appendix Figure 7 and 8In the combined sleeving method shown, the sum of the liquid absorption volumes of the first liquid absorption section 111 and the second liquid absorption section 112 corresponds to the usage state where the first airbag section 2 and the second airbag section 3 are combined and sleeved on the body 1, that is: since the inner cavity formed by the combination of the first airbag section 2 and the second airbag section 3 corresponds to the sum of the liquid absorption volumes of the first liquid absorption section 111 and the second liquid absorption section 112, when the user presses the second airbag section 3 (due to the larger cavity formed by the combination, more air can be discharged when pressed) for the liquid absorption operation, the sample liquid is sequentially absorbed into the first liquid absorption section 111 and the second liquid absorption section 112. In summary, the user can select the combined sleeving method according to the actual required liquid transfer volume. When the required liquid transfer volume is large, the combined sleeving method can be correspondingly selected; conversely, when the required liquid transfer volume is small, the single sleeving method can be correspondingly selected.

[0026] In this embodiment, due to factors such as non-standard operation and production errors, the liquid absorption volume when using the combined sleeving method is too large, resulting in inaccurate actual liquid transfer volume. Therefore, the following two anti-overflow designs can be adopted in this embodiment. Specifically, as shown in the appendix Figure 1-6 As shown, a liquid separation and breathable membrane 12 is provided at the upper port of the liquid guide tube 11 (which is a common polymer waterproof material, and its structural characteristics are common knowledge and will not be elaborated here). Among them, the liquid separation and breathable membrane 12 has the characteristic of allowing air to pass through but not liquid, so as to prevent the sample liquid from flowing out of the upper port of the liquid guide tube 11, thereby ensuring the maximum liquid transfer volume of the first liquid absorption section 111 and the second liquid absorption section 112. In addition, it can also be adopted as shown in the appendix Figure 7-8 As shown, an overflow cavity 13 that can communicate with the inner cavity of the first airbag section 2 or the inner cavity of the second airbag section 3 is formed at the top of the body 1. Among them, there is a height difference between the upper port of the liquid guide tube 11 and the bottom surface of the overflow cavity 13, that is: the excessive sample liquid can overflow through the upper port of the liquid guide tube 11 and flow downward into the overflow cavity 13 for collection, and cannot flow back into the liquid guide tube 11, thereby ensuring the maximum liquid transfer volume of the first liquid absorption section 111 and the second liquid absorption section 112. Those skilled in the art can select any of the above methods according to actual production requirements, and no specific limitation is made here.

[0027] In summary, for the convenience of understanding the above-mentioned multi-functional quantitative pipette, the following explanations are made in combination with specific usage methods.

[0028] As shown in the appendix Figure 1-6As shown, the first airbag part 2 is independently sleeved. When sucking liquid, the user gently holds the first airbag part 2 and avoids the air holes 21. At this time, the inner cavity of the first airbag part 2 and the cavity formed by enclosing the main body 1 are in internal and external air pressure balance with the external environment. Then, the user inserts the lower port of the liquid guide tube 11 of the main body 1 into the sample to be measured, and the sample liquid is sucked into the first liquid suction section 111 through the self-suction effect of the capillary tube, thus completing the liquid suction operation. On the contrary, when squeezing the liquid, the user covers and blocks the air holes 21 and presses the first airbag part 2. At this time, the inner cavity of the first airbag part 2 and the cavity formed by enclosing the main body 1 are not connected to the external environment. Then, the sample liquid is squeezed out along the first liquid suction section 111, thus completing the liquid squeezing operation.

[0029] As shown in the Figure 3-4 attachment, the second airbag part 3 is independently sleeved. When sucking liquid, the user presses the second airbag part 3 to pre-discharge the air in the inner cavity. Then, the user inserts the lower port of the liquid guide tube 11 of the main body 1 into the sample to be measured and releases the second airbag part 3. At this time, the second airbag part 3 is in a negative pressure state compared with the external environment, and the sample liquid is sucked into the first liquid suction section 111 by relying on the atmospheric pressure, thus completing the liquid suction operation. On the contrary, when squeezing the liquid, the user directly presses the second airbag part 3 to squeeze out the sample liquid along the first liquid suction section 111, thus completing the liquid squeezing operation.

[0030] As shown in the Figure 7-8 attachment, the first airbag part 2 and the second airbag part 3 are combined and sleeved. When sucking liquid, the user presses the second airbag part 3 to pre-discharge the air in the cavities formed by enclosing the inner cavities of the first airbag part 2 and the second airbag part 3 and the main body 1. Then, the user inserts the lower port of the liquid guide tube 11 of the main body 1 into the sample to be measured. At this time, the cavity formed by enclosing the inner cavities of the first airbag part 2 and the second airbag part 3 is in a negative pressure state compared with the external environment, and the sample liquid is sucked into the first liquid suction section 111 and the second liquid suction section 112 by relying on the atmospheric pressure, thus completing the liquid suction operation. On the contrary, when squeezing the liquid, the user presses the second airbag part 3. At this time, the inner cavity of the first airbag part 2 or the second airbag part 3 and the cavity formed by enclosing the main body 1 are not connected to the external environment. Then, the sample liquid is squeezed out along the first liquid suction section 111 and the second liquid suction section 112, thus completing the liquid squeezing operation.

[0031] Through the design of this embodiment, the multifunctional quantitative pipette can realize quantitative pipetting of different volumes, and during the use process, it can prevent the sample liquid from being excessive, improving the accuracy and stability of pipetting.

[0032] The embodiments described above are only the preferred embodiments of the present utility model and do not impose any formal restrictions on the present utility model. Any person skilled in the art, without departing from the scope of the technical solution of the present utility model, makes more possible changes, refinements or modifications to the technical solution of the present utility model by using the technical content disclosed above, which are all equivalent embodiments of the present utility model. Therefore, all equivalent changes made according to the idea of the present utility model without departing from the content of the technical solution of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A disposable dual quantitative function pipette, characterized in that: The invention comprises a main body (1), a first airbag part (2) and a second airbag part (3), wherein the first airbag part (2) and the second airbag part (3) both have the characteristic of elastic deformation under pressure, and the inner cavity of the first airbag part (2) is formed with an air hole (21) which communicates with the external air environment; any one of the first airbag part (2) and the second airbag part (3) can be detachably mounted on the top position of the main body (1), or the second airbag part (3) can be detachably mounted on the first airbag part (2) so that the inner cavity of the first airbag part (2) communicates with the inner cavity of the second airbag part (3) through the air hole (21); the main body (1) comprises a main body (1), a first airbag part (2) and a second airbag part (3); The body (1) is internally formed with a liquid guide tube (11) extending from its top end to its bottom end along the length direction, wherein the liquid guide tube (11) is divided from bottom to top into a first liquid absorption section (111) with a small diameter and width and a second liquid absorption section (112) with a large diameter and width, the liquid absorption volume of the first liquid absorption section (111) corresponding to a use state in which the first airbag section (2) or the second airbag section (3) is independently sleeved on the body (1); the sum of the liquid absorption volumes of the first liquid absorption section (111) and the second liquid absorption section (112) corresponds to a use state in which the first airbag section (2) and the second airbag section (3) are combined and sleeved on the body (1).

2. A disposable dual quantitative function pipette according to claim 1, characterized in that: A liquid-isolating and breathable membrane (12) is provided at the upper end of the liquid-conducting tube (11).

3. A disposable dual quantitative function pipette according to claim 1, characterized in that: The top end of the body (1) is formed with an overflow cavity (13) which can communicate with the inner cavity of the first airbag portion (2) or the inner cavity of the second airbag portion (3), wherein there is a height difference between the upper end of the catheter (11) and the bottom surface of the overflow cavity (13).

4. A disposable dual quantitative function pipette according to claim 1, characterized in that: The ventilation hole (21) is provided at the top end or the side circumference of the first airbag portion (2).

5. A disposable dual quantitative function pipette according to claim 1, characterized in that: The inner circumferential surface of the first airbag portion (2) or the second airbag portion (3) is formed with an annular portion which is engaged with an annular groove preset on the outer circumferential surface of the top end of the body (1).

6. A disposable dual quantitative function pipette according to claim 1, characterized in that: The annular portion of the inner peripheral surface of the second airbag portion (3) can be in sealing contact with the outer wall of the first airbag portion (2).

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