A liquid sampling device

Abstract

The utility model relates to medical detection technical field, more particularly, relate to a liquid sampling device. The liquid sampling device includes holding part and sampling part, and sampling part is connected with holding part, and sampling part is provided with capillary conduit, and the lateral wall of sampling part is provided with slit, and one end of sampling part away from holding part is provided with through -hole, wherein, the through -hole and slit all communicate with capillary conduit. The liquid sampling device can realize multiple suction to obtain sufficient liquid sample, improve the accuracy of detection.

Description

Technical Field

[0001] This utility model relates to the field of medical testing technology, and more specifically, to a liquid sampling device. Background Technology

[0002] In professional fields such as biomedical research, environmental monitoring, and chemical analysis, liquid sampling is a crucial step 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, air bubbles can easily get into the sampling pipe, resulting in insufficient actual sampling volume and affecting the accuracy of the test results. In addition, they cannot simultaneously achieve multiple aspiration and automatic venting functions. Utility Model Content

[0004] The purpose of this invention is to provide a liquid sampling device that can expel air bubbles and perform multiple aspirations to obtain sufficient liquid samples, thereby improving the accuracy of detection.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] This utility model provides a liquid sampling device, comprising:

[0007] Holding part;

[0008] The sampling section is connected to the holding section; the sampling section is provided with capillary channels, the side wall of the sampling section is provided with slits, and the end of the sampling section away from the holding section is provided with a through hole.

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

[0010] In an alternative implementation, the slit extends in a direction parallel to the axis of the capillary.

[0011] In an optional implementation, the slit extends through both ends of the sampling section.

[0012] In an optional implementation, the two inner walls of the slit are set at an angle, so that the width of the slit gradually increases from the capillary channel toward the outside.

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

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

[0015] In an optional embodiment, the supporting part is provided with an exhaust hole, which is connected to a capillary tube; 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 communicates with an exhaust port.

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

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

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

[0020] The liquid sampling device provided in this embodiment features a grip for picking up liquid and a capillary tube in the sampling section for collecting liquid. Liquid enters the capillary tube through a through-hole, transferring the liquid sample to a detection device for analysis. The liquid sampling device incorporates a slit, allowing air bubbles within the capillary tube to escape during sampling, thus ensuring sufficient liquid sample collection and improving detection accuracy. This embodiment, through the capillary tube and slit, enables multiple sampling and automatic air bubble removal. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the liquid sampling device provided in this embodiment from a first-view perspective;

[0023] Figure 2 This is a schematic diagram of the liquid sampling device provided in this embodiment from a second perspective.

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

[0025] Figure 4 This is a cross-sectional schematic diagram of the liquid sampling device provided in this embodiment;

[0026] Figure 5 A cross-sectional schematic diagram of a liquid sampling device provided for other embodiments.

[0027] Icons: 100-Liquid sampling device; 110-Holding part; 111-Exhaust groove; 120-Sampling part; 121-Capillary tube; 1211-Collection section; 1212-Flow limiting section; 122-Slit; 123-Through hole; 130-Holding part; 131-Exhaust hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] In existing technologies, during the process of multiple intermittent sample aspiration, air bubbles are easily mixed into the sampling pipe, resulting in insufficient actual sampling volume and thus affecting the accuracy of the test results. Secondly, existing samplers have limited functionality and cannot simultaneously achieve multiple aspiration and automatic venting functions.

[0035] For the above issues, please refer to... Figures 1-4 This invention provides a liquid sampling device 100, which includes a gripping part 110 and a sampling part 120 connected to each other. An operator can hold the gripping part 110 and then collect liquid through the sampling part 120. Alternatively, a robotic arm can grip the gripping part 110 to move the liquid sampling device 100, thereby bringing the sampling part 120 closer to the liquid for automatic sampling.

[0036] Since staff need to hold the grip part 110, the edges of the grip part 110 should be designed to be rounded to improve the comfort of staff holding it.

[0037] In this embodiment, the sampling part 120 is provided with a capillary tube 121, and a through hole 123 is provided at the end of the sampling part 120 away from the grip part 110, so that the end where the through hole 123 is located can contact the liquid, while the liquid will not contact the grip part 110.

[0038] Understandably, the capillary tube 121 is made of a hydrophilic material and has a smooth inner wall surface. In addition, the capillary tube 121 has a small diameter, so when the end of the sampling part 120 comes into contact with the liquid, the sampling part 120 can use the surface tension and viscosity of the liquid to allow the liquid to flow from the through hole 123 into the capillary tube 121, thereby achieving liquid collection.

[0039] Furthermore, in this embodiment, the sampling unit 120 is also provided with a slit 122, through which the capillary tube 121 communicates with the outside. During the liquid collection process, air bubbles may be mixed in. Because this embodiment is provided with a slit 122, the air bubbles can be discharged from the slit 122 after entering the capillary tube 121, thereby enabling the liquid sampling device 100 to collect sufficient liquid samples to improve the accuracy of detection.

[0040] It should be noted that the slit 122 in this embodiment is extremely narrow, and since the liquid has surface tension and viscosity, the liquid will not leak from the slit 122; only air bubbles will escape from it. Similarly, after the end of the sampling section 120 leaves the liquid, the liquid sample in the capillary tube 121 will not flow out from the through hole 123. When the end of the sampling section 120 contacts the liquid again, the liquid can continue to enter the capillary tube 121 from the through hole 123. Therefore, even if the sampling section 120 leaves the surface of the liquid to be collected before the liquid has completely filled the capillary tube 121, it can continue to collect liquid by re-contacting it. Thus, this embodiment can achieve multiple liquid extractions and automatic venting.

[0041] Based on the above, please refer to... Figures 1-4In this embodiment, the width of the slit 122 is b, and the range of the width of the slit 122 is: 0.01mm ≤ b ≤ 0.5mm. The width of the slit 122 can be adjusted according to the liquid to be collected. Since different liquids have different surface tension and viscosity, the width of the slit 122 should also be different for different liquids.

[0042] Specifically, if the liquid to be collected is blood, its viscosity differs from that of ordinary liquids due to variations in hematocrit. In this case, the width of the slit 122 should be 0.05mm-0.1mm to ensure that blood does not overflow from the slit 122 while allowing gas to escape, thus preventing air bubbles from mixing into the collected blood. If the liquid to be collected is urine, its viscosity is low, so the width of the slit 122 should be approximately 0.05mm to prevent urine from overflowing from the slit 122.

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

[0044] The operator holds the handle 110 and moves the liquid sampling device 100 close to the liquid to be collected, bringing the end of the sampling part 120 containing the through hole 123 into contact with the liquid. After contacting the end, the liquid enters the capillary tube 121 through the through hole 123.

[0045] After the liquid fills the capillary tube 121, the liquid sampling device 100 is brought close to the detection device, and the end of the sampling section 120 with the through hole 123 is brought into contact with the detection device. Since the tension balance inside and outside the liquid is broken at this time, the liquid in the capillary tube 121 will be discharged from the through hole 123 and enter the detection device. Then, the detection device can be used to detect the collected liquid sample.

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

[0047] Based on the above, after the liquid sampling device 100 provided in this embodiment comes into contact with the liquid, the liquid will automatically enter the capillary tube 121. Compared with the liquid collection method using a dropper in the prior art, the volume of the collected liquid is more controllable and the liquid can also be prevented from being contaminated.

[0048] In this embodiment, the extension direction of the slit 122 is parallel to the axis of the capillary tube 121. It should be noted that both ends of the capillary tube 121 in this embodiment are open. To ensure that air bubbles can be expelled regardless of their location, the slit 122 extends through both ends of the sampling section 120, meaning it extends from one end of the sampling section 120 to the other. This makes the length of the slit 122 equal to the length of the capillary tube 121. Therefore, during the process of liquid entering the capillary tube 121, air 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 air bubbles, guaranteeing sufficient liquid volume, and improving detection accuracy.

[0049] In other embodiments, the slit 122 may be provided in multiple segments, which may be arranged sequentially along the axial direction of the capillary tube 121, and the extension directions of each segment may coincide or not coincide, and may be staggered. In other embodiments, the slit 122 may also be arranged meandering around the sampling section 120.

[0050] Further, please refer to Figures 1-4 Since the liquid sampling device 100 is small in size and the slit 122 is narrow, in order to facilitate the opening of the slit 122 on the sampling part 120, the two inner walls of the slit 122 in this embodiment are set at an angle, so that the width of the slit 122 gradually increases from the capillary tube 121 toward the outside.

[0051] In this embodiment, the included angle is α, and the value of the included angle is in the range of 15°≤α≤120°. The value of the included angle can be adjusted according to the width of the slit 122 to be opened as needed. Specifically, it can be 20°, 70°, or 100°.

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

[0053] In other embodiments, the two opposing 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] Further, please refer to Figures 1-4 This embodiment also includes a supporting portion 130 connected to one end of the sampling portion 120 near the holding portion 110. The supporting portion 130 is provided with a vent hole 131, which communicates with the capillary tube 121. Therefore, 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 hole 131 is d, where d < D.

[0055] Understandably, since the diameter of the vent 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. This causes the resistance received by the liquid to change during flow. Therefore, in this embodiment, the flow rate of the liquid can be controlled by the vent hole 131.

[0056] Based on the above, the gripping part 110 is provided with an exhaust groove 111 that communicates with the exhaust port 131. Understandably, when liquid is drawn into the capillary tube 121, if the liquid sampling device 100 is inverted, the exhaust port 131 is provided, and the liquid has surface tension, which can be used to resist gravity, thereby preventing the liquid from overflowing from the exhaust port 131.

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

[0058] Understandably, the vent 131 constitutes the first layer of protection, while the vent groove 111 constitutes the second layer of protection, together preventing liquid from flowing into the grip 110.

[0059] It should be noted that after the liquid overflows from the vent hole 131 due to its own gravity, the capillary pressure at both ends of the sampling part 120 is balanced because the vent groove 111 is provided in this embodiment. In addition, the liquid has viscosity, which allows the liquid to adhere to the area around the vent hole 131, that is, the end face of the sampling part 120, so it will not flow to the gripping part 110.

[0060] Furthermore, to ensure that the exhaust groove 111 can balance the capillary pressure, the length and width of the exhaust groove 111 need to be adjusted according to the diameter of the capillary tube 121. In this embodiment, the diameter of the capillary tube 121 is D, the length of the exhaust groove 111 is L, and the width of the exhaust groove 111 is W; wherein, the range of the length of the exhaust groove 111 is: 0.5D≤L≤1.5D; and the range of the width of the exhaust groove 111 is: 0.5D≤W≤1.5D.

[0061] In other embodiments, the abutment portion 130 may also be used to close the end of the capillary tube 121, such that only one end of the capillary tube 121 is provided with an orifice for liquid to enter and exit.

[0062] Furthermore, it should be noted that the capillary channel 121 in this embodiment is cylindrical, and its diameter remains unchanged. Please refer to... Figure 5In other embodiments, the capillary tube 121 may include a collection section 1211 and a flow-limiting section 1212 that are interconnected. The collection section 1211 is connected to the through hole 123, and the flow-limiting section 1212 is connected to the vent hole 131; that is, the collection section 1211 is the front end, and the flow-limiting section 1212 is the tail end. The diameter of the flow-limiting section 1212 is smaller than the diameter of the collection section 1211, so that when the liquid flows from the collection section 1211 into the flow-limiting section 1212, the flow rate decreases, thereby regulating the flow rate of the liquid.

[0063] In summary, this embodiment uses a gripping part 110 for holding and picking up liquid, and collects liquid through the capillary tube 121 of the sampling part 120. The liquid can enter the capillary tube 121 through the through-hole 123, transferring the liquid sample from the capillary tube 121 to the detection device for testing. This embodiment also incorporates a slit 122, allowing air bubbles within the capillary tube 121 to escape during sampling, thus ensuring sufficient liquid sample collection and improving detection accuracy. Furthermore, this embodiment, by incorporating the capillary tube 121 and the slit 122, enables multiple sampling and automatic air bubble removal.

[0064] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid sampling device, characterized in that, include: Holding part (110); A sampling section (120) is connected to the holding section (110); the sampling section (120) is provided with a capillary tube (121), the side wall of the sampling section (120) is provided with a slit (122), and the end of the sampling section (120) away from the holding section (110) is provided with a through hole (123); The through hole (123) and the slit (122) are both connected to the capillary tube (121).

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

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

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

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

6. The liquid sampling device according to claim 1, characterized in that, The liquid sampling device (100) further includes a support portion (130) connected to one end of the sampling portion (120) near the grip portion (110).

7. The liquid sampling device according to claim 6, characterized in that, The supporting part (130) is provided with an exhaust hole (131), which is connected to 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 grip (110) is provided with an exhaust groove (111), which is connected to the exhaust hole (131).

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

10. The liquid sampling device according to claim 1, characterized in that, The capillary tube (121) includes a collection section (1211) and a flow-limiting section (1212) that are connected to each other. The collection section (1211) is connected to the through hole (123). The diameter of the flow-limiting section (1212) is smaller than the diameter of the collection section (1211).

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