Liquid sampling device

Abstract

The invention relates to the technical field of medical detection, in particular to a liquid sampling device. The liquid sampling device comprises a holding part and a sampling part, wherein the sampling part is connected with the holding part; the sampling part is provided with a capillary channel, the side wall of the sampling part is provided with a slit, and one end of the sampling part away from the holding part is provided with a through hole; and the through hole and the fine seam are communicated with the capillary channel. According to the liquid sampling device, multiple times of suction can be realized, so that sufficient liquid samples can be sampled, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical detection technology, and in particular to a liquid sampling device. Background Art

[0002] In professional fields such as biomedical research, environmental monitoring, and chemical analysis, liquid sampling is a key link in experimental testing, and its accuracy and safety directly affect the reliability of experimental results.

[0003] However, existing liquid sampling devices still have several technical limitations in practical applications. First, bubbles can easily enter the sampling pipe, resulting in insufficient actual sampling volume, which in turn affects the accuracy of test results. In addition, they cannot simultaneously achieve multiple aspirations and automatic exhaust functions. Summary of the Invention

[0004] The purpose of the present invention includes providing a liquid sampling device that can discharge bubbles and can achieve multiple aspirations to obtain sufficient liquid samples and improve detection accuracy.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides a liquid sampling device, comprising:

[0007] Grip;

[0008] The sampling portion is connected to the holding portion; the sampling portion is provided with a capillary channel, a slit is provided on the side wall of the sampling portion, and a through hole is provided at one end of the sampling portion away from the holding portion;

[0009] The through holes and the slits are both connected to the capillary channels.

[0010] In an optional embodiment, the extending direction of the slit is parallel to the axis of the capillary channel.

[0011] In an optional embodiment, the slit runs through both ends of the sampling portion.

[0012] In an optional embodiment, two inner walls of the slit that are opposite to each other are arranged at an angle, so that the width of the slit gradually increases from the capillary channel toward the outside.

[0013] In an optional embodiment, the angle is α, where 15°≤α≤120°.

[0014] In an optional embodiment, the liquid sampling device further includes a holding portion connected to an end of the sampling portion close to the holding portion.

[0015] In an optional embodiment, the supporting portion is provided with an exhaust hole, which is communicated with the capillary channel; and the diameter of the exhaust hole is smaller than the diameter of the through hole.

[0016] In an optional embodiment, the grip portion is provided with an exhaust groove, which is communicated with the exhaust hole.

[0017] In an optional embodiment, the width of the slit is b, where 0.01 mm ≤ b ≤ 0.5 mm.

[0018] In an optional embodiment, the capillary channel includes a collecting section and a flow-limiting section that are interconnected, and the collecting section is connected to the through hole; the diameter of the flow-limiting section is smaller than the diameter of the collecting section.

[0019] The beneficial effects of the liquid sampling device provided by the embodiment of the present invention include:

[0020] The liquid sampling device provided in this embodiment is provided with a grip for picking up liquids and a capillary channel in the sampling portion for collecting liquids. Liquids can enter the capillary channel through the through-holes, thereby transferring the liquid sample in the capillary channel to the detection device for testing. The liquid sampling device is provided with a fine slit, which allows bubbles in the capillary channel to be discharged through the slit during the sampling process, thereby collecting sufficient liquid samples and improving detection accuracy. The provision of the capillary channel and fine slit in this embodiment enables multiple sampling and automatic bubble discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of the liquid sampling device provided in this embodiment from a first viewing angle;

[0023] Figure 2 A schematic structural diagram of the liquid sampling device provided in this embodiment from a second viewing angle;

[0024] Figure 3 for Figure 2 Schematic diagram of the cross section at AA in the middle;

[0025] Figure 4 A schematic cross-sectional view of the liquid sampling device provided in this embodiment;

[0026] Figure 5 A schematic cross-sectional view of a liquid sampling device provided in another embodiment.

[0027] Icon: 100-liquid sampling device; 110-holding part; 111-exhaust groove; 120-sampling part; 121-capillary tube; 1211-collecting section; 1212-flow limiting section; 122-slit; 123-through hole; 130-holding part; 131-exhaust hole. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0033] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0034] In the existing technology, during the process of multiple intermittent sample aspiration by the liquid sampling device, bubbles are easily mixed into the sampling pipeline, resulting in insufficient actual sampling volume, which in turn affects the accuracy of the test results; secondly, the existing sampler has a single function and cannot simultaneously realize multiple aspiration and automatic exhaust functions.

[0035] For the above questions, please refer to Figure 1-Figure 4The present invention provides a liquid sampling device 100, which includes a gripping portion 110 and a sampling portion 120 connected to each other. A worker can grip the gripping portion 110 and then collect liquid through the sampling portion 120. It is understood that a robotic arm can also be used to grip the gripping portion 110 to move the liquid sampling device 100, thereby bringing the sampling portion 120 close to the liquid to achieve automatic sampling.

[0036] Since the staff needs to hold the gripping portion 110 with their hands, the edge of the gripping portion 110 should be designed to be arc-shaped to improve the comfort of the staff holding it.

[0037] The sampling portion 120 in this embodiment is provided with a capillary channel 121 , and a through hole 123 is provided at one end of the sampling portion 120 away from the gripping portion 110 , so that the end where the through hole 123 is located can contact the liquid without the liquid contacting the gripping portion 110 .

[0038] It can be understood that the capillary channel 121 is made of hydrophilic material and has a smooth inner wall surface. In addition, the diameter of the capillary channel 121 is small, so when the end of the sampling portion 120 contacts the liquid, the sampling portion 120 can utilize the tension and viscosity of the liquid to allow the liquid to flow from the through hole 123 into the capillary channel 121, thereby realizing the collection of the liquid.

[0039] Furthermore, in this embodiment, the sampling portion 120 is further provided with a slit 122, through which the capillary channel 121 communicates with the outside world. During the liquid collection process, bubbles may enter. Due to the provision of slit 122 in this embodiment, bubbles entering the capillary channel 121 are then discharged through slit 122, thereby enabling the liquid sampling device 100 to collect sufficient liquid sample, thereby improving detection accuracy.

[0040] It should be noted that the slit 122 in this embodiment is extremely narrow, and the liquid has tension and viscosity. Therefore, the liquid will not leak from the slit 122, and only bubbles will be discharged from the slit 122. Similarly, after the end of the sampling portion 120 leaves the liquid, the liquid sample in the capillary channel 121 will not flow out of the through hole 123. When the end of the sampling portion 120 contacts the liquid again, the liquid can continue to enter the capillary channel 121 through the through hole 123. Therefore, even if the liquid has not yet filled the capillary channel 121, if the sampling portion 120 leaves the surface of the liquid to be collected, collection can continue by re-contacting. As a result, this embodiment can achieve multiple liquid aspiration and automatic exhaust.

[0041] Based on the above, please refer to Figure 1-Figure 4In this embodiment, the width of the slit 122 is b, where the width of the slit 122 ranges from 0.01 mm to b and from 0.5 mm to 0.5 mm. The width of the slit 122 can be adjusted based on the liquid to be collected. Because different liquids have different tensions and viscosities, the width of the slit 122 should also vary for different liquids.

[0042] Specifically, if the liquid to be collected is blood, which has a different viscosity than ordinary liquids due to its different compression volume, the width of slit 122 should be 0.05mm-0.1mm. This ensures that blood does not overflow from slit 122, while allowing air to escape from slit 122, thereby preventing air bubbles from being mixed into the collected blood. If the liquid to be collected is urine, which has a lower viscosity, the width of slit 122 should be approximately 0.05mm to prevent urine from overflowing from slit 122.

[0043] The operation process of the liquid sampling device 100 provided in this embodiment is as follows:

[0044] The staff member holds the gripping portion 110, moves the liquid sampling device 100 close to the liquid to be collected, and brings the end portion of the sampling portion 120 where the through hole 123 is located into contact with the liquid. After contacting the end portion, the liquid enters the capillary channel 121 through the through hole 123.

[0045] After the liquid fills the capillary channel 121, the liquid sampling device 100 is moved close to the detection device, and the end of the sampling portion 120 where the through hole 123 is located is brought into contact with the detection device. Since the tension balance between the inside and outside of the liquid is broken at this time, the liquid in the capillary channel 121 will be discharged from the through hole 123 and enter the detection device; then, the collected liquid sample can be tested using the detection device.

[0046] It should be noted that, since the volume of the capillary channel 121 does not change, and the liquid needs to fill the capillary channel 121 before the collection is completed, the volume of the collected liquid is equal to the volume of the capillary channel 121, so this embodiment can achieve quantitative collection.

[0047] According to the above content, after the liquid sampling device 100 provided in this embodiment comes into contact with liquid, the liquid will automatically enter the capillary channel 121. Compared with the method of collecting liquid using a dropper in the prior art, the volume of the collected liquid is more controllable and can also prevent the liquid from being contaminated.

[0048] In this embodiment, the extension direction of the slit 122 is parallel to the axis of the capillary channel 121. It should be noted that both ends of the capillary channel 121 are open. To ensure that bubbles can be expelled regardless of their location, the slit 122 in this embodiment extends through both ends of the sampling portion 120, that is, the slit 122 extends from one end of the sampling portion 120 to the other end of the sampling portion 120; thus, the length of the slit 122 is equal to the length of the capillary channel 121. As a result, as liquid enters the capillary channel 121, bubbles can be expelled from the slit 122 regardless of where they appear in the liquid, ensuring that the collected liquid sample does not contain bubbles, ensuring sufficient liquid volume, and improving detection accuracy.

[0049] In other embodiments, the slits 122 may be arranged in multiple sections, which may be arranged in sequence along the axis of the capillary channel 121, and the extension directions of each section may overlap or may not overlap, and may be staggered. In other embodiments, the slits 122 may be arranged to meander around the sampling portion 120.

[0050] For further information, please refer to Figure 1-Figure 4 Since the volume of the liquid sampling device 100 is small and the width of the slit 122 is small, in order to facilitate the opening of the slit 122 on the sampling portion 120, the two opposing inner walls of the slit 122 in this embodiment are arranged at an angle such that the width of the slit 122 gradually increases from the capillary channel 121 toward the outside.

[0051] In this embodiment, the angle is α, wherein the range of the angle is 15°≤α≤120°, and the value of the angle can be adjusted according to the width of the slit 122 to be opened, specifically 20°, 70°, and 100°.

[0052] It should be noted that when the two inner walls of the slit 122 are arranged at an angle, the width of the inner wall is smaller than the width of the outer wall. At this time, since the width of the inner wall will affect the flow of liquid in the capillary channel 121, the width of the slit 122 refers to the width of the inner wall.

[0053] In other embodiments, the two opposite inner walls of the slit 122 may also be parallel to each other, so that the width of the outer wall is equal to the width of the inner wall.

[0054] For further information, please refer to Figure 1-Figure 4 This embodiment further includes a supporting portion 130 connected to the end of the sampling portion 120 near the grip portion 110. Furthermore, the supporting portion 130 is provided with a vent 131 that communicates with the capillary tube 121. In other words, the supporting portion 130 in this embodiment has an annular structure. In this embodiment, the diameter of the through hole 123 is D, and the diameter of the vent 131 is d, where d < D.

[0055] It can be understood that since the diameter of the exhaust hole 131 is smaller than that of the through hole 123, the pressure between the two ends of the capillary tube 121 is different, resulting in a pressure difference, which causes the resistance encountered by the liquid to change during flow. Therefore, this embodiment can control the flow rate of the liquid through the exhaust hole 131.

[0056] As described above, the grip portion 110 is provided with a vent groove 111 that communicates with the vent hole 131. It is understood that after liquid is drawn into the capillary tube 121, if the liquid sampling device 100 is inverted, the vent hole 131 and the tension of the liquid can be used to counteract gravity, thereby preventing the liquid from overflowing from the vent hole 131.

[0057] However, the diameter of the exhaust hole 131 is smaller than the diameter of the through hole 123, resulting in different capillary pressures at both ends, thereby affecting the surface tension of the liquid. Therefore, the exhaust groove 111 is provided in this embodiment to balance the capillary pressures at both ends, thereby preventing the liquid from overflowing from the exhaust hole 131 and flowing to the gripping portion 110, thereby preventing the staff from coming into contact with the liquid.

[0058] It can be understood that the exhaust holes 131 constitute a first layer of protection, and the exhaust grooves 111 constitute a second layer of protection, which together prevent liquid from flowing toward the grip portion 110 .

[0059] It should be noted that after the liquid overflows the vent hole 131 due to its own gravity, the capillary pressure at both ends of the sampling portion 120 is balanced due to the provision of the vent groove 111 in this embodiment; in addition, the viscosity of the liquid allows the liquid to adhere to the periphery of the vent hole 131, that is, the end surface of the sampling portion 120, and thus will not flow toward the grip portion 110.

[0060] Furthermore, to ensure that the venting groove 111 can balance capillary pressure, the length and width of the venting groove 111 must be adjusted according to the diameter of the capillary channel 121. In this embodiment, the diameter of the capillary channel 121 is D, the length of the venting groove 111 is L, and the width of the venting groove 111 is W. The length of the venting groove 111 can be in the range of 0.5D ≤ L ≤ 1.5D, and the width of the venting groove 111 can be in the range of 0.5D ≤ W ≤ 1.5D.

[0061] In other embodiments, the abutting portion 130 may also be used to close the end of the capillary channel 121 , so that only one end of the capillary channel 121 is provided with a hole for liquid entry and discharge.

[0062] Furthermore, it should be noted that the capillary channel 121 in this embodiment is cylindrical and its diameter does not change. Figure 5In other embodiments, the capillary channel 121 may include a collection section 1211 and a flow-restricting section 1212, which are interconnected. The collection section 1211 is connected to the through hole 123, and the flow-restricting section 1212 is connected to the exhaust hole 131. Specifically, the collection section 1211 is the front end, and the flow-restricting section 1212 is the rear end. The diameter of the flow-restricting section 1212 is smaller than that of the collection section 1211. This reduces the flow rate of the liquid as it flows from the collection section 1211 into the flow-restricting section 1212, thereby regulating the flow rate of the liquid.

[0063] In summary, this embodiment provides a gripping portion 110 for holding and picking up, and collects liquid through the capillary channel 121 of the sampling portion 120, allowing liquid to enter the capillary channel 121 through the through hole 123, thereby transferring the liquid sample in the capillary channel 121 to the detection device for detection. This embodiment provides a slit 122, allowing bubbles in the capillary channel 121 to be discharged through the slit 122 during the sampling process, thereby collecting sufficient liquid sample and improving the accuracy of the detection. This embodiment, by providing the capillary channel 121 and the slit 122, enables multiple sampling and automatic bubble discharge.

[0064] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A liquid sampling device, characterized in that: include: a grip portion (110); A sampling portion (120), the sampling portion (120) being connected to the holding portion (110); the sampling portion (120) being provided with a capillary channel (121); a side wall of the sampling portion (120) being provided with a slit (122); and an end of the sampling portion (120) away from the holding portion (110) being provided with a through hole (123); Wherein, the through hole (123) and the slit (122) are both in communication with the capillary channel (121).

2. The liquid sampling device according to claim 1, characterized in that The extending direction of the slit (122) is parallel to the axis of the capillary channel (121).

3. The liquid sampling device according to claim 1, characterized in that The slit (122) passes through both ends of the sampling portion (120).

4. The liquid sampling device according to claim 1, characterized in that: The two inner walls of the slit (122) facing each other are arranged at an angle, so that the width of the slit (122) gradually increases from the capillary channel (121) toward the outside.

5. The liquid sampling device according to claim 4, characterized in that: The angle is α, wherein 15°≤α≤120°.

6. The liquid sampling device according to claim 1, characterized in that: The liquid sampling device (100) further includes a holding portion (130), wherein the holding portion (130) is connected to an end of the sampling portion (120) close to the holding portion (110).

7. The liquid sampling device according to claim 6, characterized in that: The supporting portion (130) is provided with an exhaust hole (131), and the exhaust hole (131) is communicated with the capillary tube (121); the diameter of the exhaust hole (131) is smaller than the diameter of the through hole (123).

8. The liquid sampling device according to claim 7, characterized in that: The gripping portion (110) is provided with an exhaust groove (111), and the exhaust groove (111) is communicated with the exhaust hole (131).

9. The liquid sampling device according to claim 1, characterized in that: The width of the slit (122) is b, wherein 0.01 mm ≤ b ≤ 0.5 mm.

10. The liquid sampling device according to claim 1, characterized in that: The capillary channel (121) comprises a collecting section (1211) and a flow-limiting section (1212) that are in communication with each other, the collecting section (1211) being in communication with the through hole (123); and the diameter of the flow-limiting section (1212) being smaller than the diameter of the collecting section (1211).

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