Multifunctional quantitative pipetting suction tube

Abstract

The utility model discloses a multifunctional quantitative pipetting suction tube 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 liquid transfer, in particular to a multifunctional quantitative liquid transfer straw. Background Art

[0002] In the fields of biology, chemistry, and medical testing, commonly used pipettes on the market use air bags to aspirate liquid. The air in the pipette is expelled by pressing the air bag, making the pipette in a negative pressure state. At this time, the aspiration port of the pipette is immersed in the liquid to be tested; then the air bag is released, and the liquid to be tested enters the pipette from the aspiration port under the action of atmospheric pressure; after the aspiration is completed, pressing the air bag again can expel the liquid to be tested in the pipette, completing the pipetting operation.

[0003] In response to this problem, the applicant applied for a related patent for "a disposable quantitative pipette sampler". A quantitative sampling liquid is sucked into the liquid storage cavity through the self-priming action of the capillary. The sampling liquid stored in the liquid storage cavity can be pushed out by pressing the piston rod and dripped to the designated position. The sampling process is simple and quick, reducing the use of other equipment such as pipettes and saving costs. This method has a good effect on quantitative collection, but this type of quantitative collection method requires the use of pipette samplers of different specifications for collection conditions with different collection volume requirements. Therefore, the user needs to purchase pipette samplers of various specifications (such as 10μL, 60μL, different specifications), which undoubtedly increases the user's procurement cost and is inconvenient to use and easy to mix up. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a multifunctional quantitative liquid transfer straw with flexible and rich functions and accurate liquid transfer.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a multifunctional quantitative liquid transfer straw, comprising a body, a first airbag part and a second airbag part, wherein the first airbag part and the second airbag part both have a compression elastic deformation characteristic, and the inner cavities of the first airbag part and the second airbag part are both formed with air holes that communicate with the external air environment; any one of the first airbag part and the second airbag part can be detachably and independently sleeved on the top position of the body, or the second airbag part can be 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 its air holes; a liquid guide tube extending from the top end to the bottom end along the length direction is formed inside the body, wherein 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, and the liquid suction volume of the first liquid suction section corresponds to the use state of the first airbag part or the second airbag part being 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 of the first airbag part and the second airbag part being combined and sleeved on the body.

[0006] Furthermore, a liquid-isolating and breathable membrane is provided at the upper end of the liquid-conducting tube.

[0007] Furthermore, a liquid overflow cavity which 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, wherein there is a height difference between the upper end of the liquid guide tube and the bottom surface of the liquid overflow cavity.

[0008] Furthermore, the ventilation holes of the first airbag portion or the second airbag portion are arranged at the top end position or the side circumferential surface position of the first airbag portion or the second airbag portion.

[0009] Furthermore, an annular portion is formed on the inner circumferential surface of the first airbag portion or the second airbag portion, which is engaged with an annular groove preset on the outer circumferential surface of the top end of the body.

[0010] Furthermore, the annular portion of the inner peripheral surface of the second airbag portion may be in sealing contact with the outer wall of the first airbag portion.

[0011] The utility model adopts the above-mentioned scheme, and its beneficial effect lies in: by adopting the above-mentioned structure, when the utility model is in use, the first airbag part or the second airbag part can be independently mounted on the main body to achieve the effect of quantitative collection; in addition, the first airbag part and the second airbag part can also be mounted on the main body in combination, which also achieves the effect of quantitative collection; it can be seen that the utility model can realize quantitative collection of different specifications (small, large) by independently or in combination mounting the first airbag part and the second airbag part on the main body, and the functions are flexible and rich, which can meet the collection conditions with different collection volume requirements, reduce the number of specifications of pipettes or other pipetting equipment, and reduce costs; and the structure is simple and compact, which is easy to use and promote. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0014] Figure 5-6 This is a schematic diagram showing the location of the air vents on the side surface.

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

[0016] Among them, 1-main body, 11-liquid guide tube, 111-first liquid absorption section, 112-second liquid absorption section, 12-liquid isolation breathable membrane, 13-overflow cavity, 2-first air bag part, 3-second air bag part, 21-air permeability hole. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention is described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0018] See attached Figure 1-8 As shown, in this embodiment, a multifunctional quantitative liquid pipette includes a body 1, a first airbag portion 2, and a second airbag portion 3, wherein the first airbag portion 2 and the second airbag portion 3 both have an inner cavity structure with a lower opening. The first airbag portion 2 and the second airbag portion 3 both have a pressing elastic deformation characteristic, so that the user can press or release the first airbag portion 2 or the second airbag portion 3 after the first airbag portion 2 and / or the second airbag portion 3 are correspondingly installed on the body 1, thereby realizing the operation of sucking or squeezing liquid.

[0019] In the present embodiment, any one of the first airbag portion 2 and the second airbag portion 3 can be detachably and independently mounted on the top position of the main body 1, wherein the inner circumferential surface of the first airbag portion 2 or the second airbag portion 3 of the present embodiment is formed with an annular portion that is snap-fitted with an annular groove preset on the outer circumferential surface of the top end of the main body 1, that is: through the snap-fitting cooperation between the annular portion and the annular groove, the first airbag portion 2 or the second airbag portion 3 can be correspondingly sealed and fixed at the top position of the main body 1, and the installation is convenient and quick. When disassembly is required, the first airbag portion 2 or the second airbag portion 3 can be easily pulled off.

[0020] For the convenience of explanation, Figure 1-6 A specific explanation is given for the first airbag portion 2 or the second airbag portion 3 being sleeved on the top of the body 1. Figure 1-2 As shown, the first airbag portion 2 is selected to be sleeved on the top of the main body 1; Figure 3-4 As shown, the second airbag portion 3 is selected to be correspondingly mounted on the top position of the main body 1; the user can select the appropriate first airbag portion 2 or second airbag portion 3 according to the actual pipetting volume requirements. The first airbag portion 2 and the second airbag portion 3 of this embodiment can respectively correspond to different liquid aspiration volume requirements.

[0021] In this embodiment, the inner cavities of the first airbag portion 2 and the second airbag portion 3 are both formed with ventilation holes 21 that communicate with the external air environment, wherein the ventilation holes 21 of the first airbag portion 2 or the second airbag portion 3 are opened at the top position or the side circumference position of the first airbag portion 2 or the second airbag portion 3, as shown in the attached Figure 1-4 The vent hole 21 of the first airbag portion 2 or the second airbag portion 3 is provided at the top of the first airbag portion 2 or the second airbag portion 3. In this way, when the user pinches the first airbag portion 2 and the second airbag portion 3 to squeeze the liquid, he needs to press and block the vent hole 21 with another finger. Figure 5 and 6 The vent holes 21 of the first airbag part 2 or the second airbag part 3 are provided at the side circumference of the first airbag part 2 or the second airbag part 3. This method is more suitable for actual operation, that is, when the user squeezes the first airbag part 2 and the second airbag part 3 to squeeze liquid, the hand just presses and blocks the vent holes 21. Those skilled in the art can adjust and select appropriate vent hole 21 opening positions according to actual production conditions.

[0022] In this embodiment, in addition to the above-mentioned separate set method, the attached Figure 7-8 In the combined sleeve arrangement shown, 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 its vent hole 21 (at this time, the second airbag portion 3 wraps the vent hole 21 of the first airbag portion 2 into its inner cavity), so that the first airbag portion 2 and the second airbag portion 3 form a larger cavity, so as to increase the liquid absorption volume. Further, when the combined sleeve arrangement is adopted, the annular portion of the inner circumference of the second airbag portion 3 can be sealed and contacted with the outer wall of the first airbag portion 2, thereby ensuring that the first airbag portion 2 and the second airbag portion 3 form a larger closed cavity; similarly, when disassembly is required, the second airbag portion 3 can be easily pulled off.

[0023] In this embodiment, a liquid guide tube 11 is formed inside the body 1 and extends from its top to the bottom along the length direction, wherein the liquid guide tube 11 is divided from bottom to top into a first liquid suction section 111 with a small diameter and a second liquid suction section 112 with a large diameter. The diameter and depth of the first liquid suction section 111 and the second liquid suction section 112 are determined according to the actual amount of liquid transfer. Those skilled in the art can set appropriate size specifications, and no specific restrictions are made here. For ease of understanding, the above-mentioned liquid guide tube 11 is specifically explained below in combination with the above-mentioned single sleeve or combined sleeve method.

[0024] See attached Figure 1-6 In the separate sleeve arrangement shown, the liquid absorption capacity of the first liquid absorption section 111 corresponds to the use state of the first airbag part 2 or the second airbag part 3 being independently sleeved on the main body 1, that is: because the liquid absorption capacity of the first airbag part 2 or the second airbag part 3 corresponds to the liquid absorption capacity of the first liquid absorption section 111, when the user gently holds the first airbag part 2 or the second airbag part 3 to perform the liquid absorption operation, the sample liquid can only be absorbed into the first liquid absorption section 111. See the attached Figure 7 and 8In the combined sleeve 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 use state of the first airbag section 2 and the second airbag section 3 being combined and sleeved on the main body 1, that is: because 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 gently holds the first airbag section 2 and the second airbag section 3 to perform the liquid absorption operation, the sample liquid is absorbed into the first liquid absorption section 111 and the second liquid absorption section 112 in sequence. In summary, the user can select the combined sleeve method according to the actual required amount of liquid transfer. When the required amount of liquid transfer is large, the user can select the single sleeve method accordingly; conversely, when the required amount of liquid transfer is large, the user can select the single sleeve method accordingly.

[0025] In this embodiment, due to factors such as irregular operation and production errors, the amount of liquid aspirated by the combined set is too large, resulting in an inaccurate amount of actual liquid transfer. Therefore, this embodiment can adopt the following two anti-overflow designs, specifically, as shown in the attached Figure 1-6 As shown, a liquid-isolating and breathable membrane 12 (a common polymer waterproof material, whose structural characteristics are common knowledge and will not be described in detail here) is provided at the upper end of the liquid-guiding tube 11, wherein the liquid-isolating and breathable membrane 12 has the characteristic of passing air but not liquid, thereby preventing the sample liquid from flowing out of the upper end of the liquid-guiding tube 11, thereby ensuring the maximum liquid transfer volume of the first liquid-absorbing section 111 and the second liquid-absorbing section 112. In addition, an attached Figure 7-8 As shown, the top of the body 1 is formed with an overflow cavity 13 that can communicate with the inner cavity of the first airbag part 2 or the inner cavity of the second airbag part 3, wherein 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, excess 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 suction section 111 and the second liquid suction section 112. Those skilled in the art can correspond to any of the above methods according to actual production requirements, and no specific restrictions are made here.

[0026] In summary, in order to facilitate the understanding of the above-mentioned multifunctional quantitative pipette, the following explanation is made in combination with the specific usage method.

[0027] As attached Figure 1-6As shown, the first airbag part 2 or the second airbag part 3 is independently set. When aspirating liquid, the user gently holds the first airbag part 2 or the second airbag part 3 and avoids the air hole 21. At this time, the inner cavity of the first airbag part 2 or the second airbag part 3 and the cavity formed by the body 1 are in internal and external pressure balance with the external environment. Then the user extends the lower end of the liquid guide tube 11 of the body 1 into the sample to be tested, and the sample liquid is sucked into the first liquid aspiration section 111 through the self-priming effect of the capillary, and the aspiration operation is completed. On the contrary, when squeezing liquid, the user covers and blocks the air hole 21 and presses the first airbag part 2 or 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 the body 1 are not connected to the external environment. Then the sample liquid is squeezed out along the first liquid aspiration section 111, and the squeezing operation is completed.

[0028] As attached Figure 7-8 As shown, the first airbag part 2 and the second airbag part 3 are combined and set in a sleeve manner. When aspirating liquid, the user gently holds the first airbag part 2 and the second airbag part 3 and avoids the air vent 21 of the second airbag part 3. At this time, the inner cavity of the first airbag part 2 and the inner cavity of the second airbag part 3 and the cavity formed by the body 1 are in internal and external pressure balance with the external environment. Then the user extends the lower end of the liquid guide tube 11 of the body 1 into the sample to be tested, and the sample liquid is sequentially aspirated into the first liquid aspiration section 111 and the second liquid aspiration section 112 through the self-priming effect of the capillary, thus completing the aspiration operation. On the contrary, when squeezing liquid, the user covers and blocks the air vent 21 of the second airbag part 3 and presses the first airbag part 2 or 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 the body 1 are not connected to the external environment. Then the sample liquid is squeezed out along the first liquid aspiration section 111, thus completing the squeezing operation.

[0029] To ensure that the liquid flows smoothly in the liquid catheter 11, the liquid absorption volume of the first liquid absorption section 111 corresponds to the use state of the first air bag part 2 or the second air bag part 3 being independently mounted on the main body 1, that is, when the first air bag part 2 or the second air bag part 3 is independently mounted on the main body 1, its inner cavity volume corresponds to the liquid absorption volume of the first liquid absorption section 111, ensuring that the liquid flows in the first liquid absorption section 111 without overflowing into the second liquid absorption section 112; further, the sum of the liquid absorption volumes of the first liquid absorption section 111 and the second liquid absorption section 112 corresponds to the use state of the first air bag part 2 and the second air bag part 3 being combined and mounted on the main body 1, that is, when the first air bag part 2 and the second air bag part 3 are combined and mounted on the main body 1, the larger inner cavity volume formed by the first air bag part 2 and the second air bag part 3 corresponds to the total liquid absorption volume of the first liquid absorption section 111 and the second liquid absorption section 112, thereby ensuring that the liquid flows in the first liquid absorption section 111 and the second liquid absorption section 112 without overflowing.

[0030] Through the design of this embodiment, the multifunctional quantitative pipette can realize quantitative pipetting of different volumes, and during use, it can prevent excessive sample liquid and improve the accuracy and stability of pipetting.

[0031] The embodiments described above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any technician familiar with the field, without departing from the scope of the technical solution of the present invention, can make more possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or the modifications are equivalent embodiments of the present invention. Therefore, any equivalent and equivalent changes made according to the idea of ​​the present invention without departing from the content of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional quantitative 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 cavities of the first airbag part (2) and the second airbag part (3) are both formed with air holes (21) communicating 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) is connected to the inner cavity of the second airbag part (3) through the air holes (21) thereof. The main body (1) is provided 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 a second liquid absorption section (112) with a large diameter and a liquid absorption volume of the first liquid absorption section (111) corresponds to a use state in which the first airbag section (2) or the second airbag section (3) is independently sleeved on the main body (1); and 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 main body (1).

2. A multifunctional quantitative liquid transfer 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 multifunctional quantitative liquid transfer 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 multifunctional quantitative liquid transfer pipette according to claim 1, characterized in that: The air permeability hole (21) of the first airbag portion (2) or the second airbag portion (3) is provided at the top end position or the side peripheral surface position of the first airbag portion (2) or the second airbag portion (3).

5. The multifunctional quantitative liquid transfer 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 multifunctional quantitative liquid transfer 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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