Medical testing device, capillary adapter, and sample injection needle assembly
By designing the docking groove and through-hole structure between the capillary adapter and the injection needle, the problem of capillary breakage during docking was solved, achieving high-quality sample transfer and safety protection, and improving the performance of the detection equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EDAN INSTR
- Filing Date
- 2023-12-29
- Publication Date
- 2026-07-10
AI Technical Summary
In medical testing equipment, capillary tubes are prone to breakage when they are connected to the injection pin, and there are risks of sample contamination and safety hazards for testing personnel.
Design a capillary adapter with a docking groove and a through hole for fitting the injection needle. The through hole is used to hold the capillary. By using an elastic material and a guiding bevel structure, the pressure on the capillary is reduced, achieving a tight docking and preventing breakage.
It improves sample quality and detection accuracy, protects capillary tubes from breakage, reduces the risk of sample contamination, and ensures the safety of testing personnel.
Smart Images
Figure CN224480488U_ABST
Abstract
Description
[0001] This application is based on application number 202323664592.0, filed on December 29, 2023, and entitled "Sample Injection". A divisional application has been filed for the Chinese utility model patent application for "component and capillary adapter". Technical Field
[0002] The disclosed embodiments of this application relate to the field of detection technology, and more specifically, to sample introduction components and capillary adapters. Background Technology
[0003] In clinical practice, blood gas analysis using capillary pipettes requires strict adherence to procedures. The capillary tube must be completely filled with blood, and there should be no air bubbles or clots present. If air bubbles or clots are found, the blood must be collected again. After collection, the capillary tube should be placed horizontally and the analysis should begin immediately. If the capillary tube has caps at both ends, these caps must be sealed after collection to prevent the blood from coming into contact with air, which could interfere with the measurement.
[0004] When medical testing equipment injects samples, the sampling needle of the sampling component enters the capillary to draw up the sample. However, during the docking process between the handheld capillary and the instrument's sampling needle assembly, docking pressure needs to be applied to ensure the airtightness of the connection between the capillary and the sampling needle, in order to reduce the extraction of air from the sampling needle. However, during the docking process, the capillary is prone to breakage. Utility Model Content
[0005] According to embodiments of this application, this application proposes a sample introduction assembly and a capillary adapter to solve the above-mentioned problems.
[0006] This application provides a capillary adapter for use in medical testing equipment. The capillary adapter includes a first end and a second end, and a through hole penetrating the first end and the second end. The end face of the first end has a mating groove for accommodating a sample injection needle. The through hole is used to hold a capillary tube at least at one end adjacent to the bottom of the mating groove.
[0007] In some embodiments, the through hole has a clamping section and a guiding section, the radial dimension of the clamping section being smaller than the outer diameter of the capillary and located at one end of the through hole adjacent to the bottom of the mating groove, and the radial dimension of the guiding section being larger than the outer diameter of the capillary and located at one end of the through hole away from the bottom of the mating groove.
[0008] In some embodiments, the bottom of the mating groove has a protrusion, and the first end of the through hole passes through the protrusion.
[0009] In some embodiments, the protrusion is conical in shape.
[0010] In some embodiments, the inner wall of the guide section gradually moves away from the central axis of the capillary adapter from the clamping section in a direction away from the docking groove, forming a first guide slope with a gradually increasing inner diameter of the through hole.
[0011] In some embodiments, the inner wall of the guide segment gradually approaches the central axis of the capillary adapter from the second end of the capillary adapter toward the docking groove, forming a second guide slope with a gradually decreasing inner diameter of the through hole.
[0012] According to the present application, a sample injection assembly includes: a sample injection needle assembly having a sample injection needle body and a sample injection needle extending from the tip end of the sample injection needle body; a capillary adapter having a first end and a second end and a through hole penetrating the first end and the second end, the end face of the first end having a mating groove adapted to the sample injection needle tip, and the through hole being used to clamp the capillary at least at one end adjacent to the bottom of the mating groove.
[0013] In some embodiments, the sidewall of the docking groove has a first segment, a second segment, and a third segment in the axial direction of the capillary adapter. The first segment and the third segment are parallel to the central axis of the capillary adapter. The second segment connects the first segment and the third segment. The first segment is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third segment. The outer wall of the tip of the injection needle body has a first surface, a second surface, and a third surface in the axial direction. At least a portion of the first surface abuts against the first segment of the docking groove. At least a portion of the second surface abuts against the second segment of the docking groove. At least a portion of the third surface abuts against the third segment of the docking groove. The first surface and the third surface are parallel. The second surface connects the first surface and the third surface.
[0014] The beneficial effects of this application are as follows: The capillary adapter has a first end and a second end, as well as a through hole penetrating the first and second ends. The first end face has a mating groove adapted to the end of the injection needle. The capillary adapter can be tightly mated with the injection needle body, so that the injection needle does not draw air when extracting the sample from the capillary, thereby improving the quality of the sample entering the medical testing equipment. Furthermore, the through hole of the capillary adapter is used to hold the capillary at least at one end near the bottom of the mating groove. In this way, the capillary can be mated with the injection needle assembly by holding the capillary adapter, transferring the pressure on the capillary during mating to the capillary adapter, thereby reducing the pressure on the capillary and preventing capillary rupture. This not only preserves the sample but also ensures the safety of the testing personnel.
[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description
[0016] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:
[0017] Figure 1 This is a schematic cross-sectional view of the sample introduction component assembly according to an embodiment of the sample introduction component of this application;
[0018] Figure 2 This is a schematic diagram of the structure of the capillary adapter described in the embodiments of the capillary adapter of this application;
[0019] Figure 3 This is a cross-sectional schematic diagram of the capillary adapter and capillary tube according to an embodiment of the capillary adapter of this application;
[0020] Figure 4 This is a cross-sectional schematic diagram of a capillary adapter according to an embodiment of the capillary adapter of this application. Detailed Implementation
[0021] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0022] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.
[0023] In clinical practice, blood gas analysis using capillary tubes requires strict adherence to procedures. The capillary tube must be completely filled with blood, and there should be no air bubbles or clots present. If air bubbles or clots are found, the blood must be collected again. After collection, the capillary tube should be placed horizontally and the analysis should begin immediately. If the capillary tube has caps at both ends, these caps must be sealed after collection to prevent the blood from coming into contact with air, which could interfere with the measurement.
[0024] Through long-term research, the applicant has discovered that during sample introduction in medical testing equipment, the sampling needle of the sampling component enters the capillary to aspirate the sample, enabling the equipment to perform testing. During the process of connecting the capillary to the instrument's sampling needle assembly, or using other tools to clamp the capillary, a certain external force is required to ensure an airtight connection and reduce air extraction during sample introduction. However, when using external force, the capillary may break due to the force or the interaction between it and the sampling needle assembly, adversely affecting the sample and potentially posing a safety hazard to the testing personnel. Therefore, to solve the above-mentioned technical problems, this application proposes at least the following embodiments.
[0025] Please see Figures 1 to 3 The sample introduction assembly described in this application includes a sample introduction needle assembly 3 and a capillary adapter 1. The sample introduction needle assembly 3 includes a sample introduction needle body 32 and a sample introduction needle 31 extending from the tip of the sample introduction needle body 32. The capillary adapter 1 has a first end and a second end, and a through hole 30 passing through the first and second ends. This allows the capillary 2 and the sample introduction needle 31 to communicate through the through hole 30 of the capillary adapter 1, enabling the sample introduction needle 31 to retrieve the sample from the capillary 2. To allow the capillary adapter 1 to mate with the sample introduction assembly, the first end face of the capillary adapter 1 has a mating groove 40 adapted to the tip of the sample introduction needle 31. The through hole 30 is used to hold the capillary 2 at least at one end adjacent to the bottom of the mating groove 40. Because the end of the through hole 30 adjacent to the bottom of the mating groove 40 is used to hold the capillary 2, the sample from the capillary 2 can be retrieved even when the sample introduction needle 31 extends a relatively short distance from its tip. In this way, when the capillary adapter 1 is not fully aligned with the injection assembly, that is, when there is a certain angle between the central axis of the extended injection needle 31 and the central axis of the capillary 2, the injection needle 31 extending from the tip of the injection needle body 32 can avoid contact between the tip of the injection needle 31 and the inner wall of the capillary 2, thus avoiding the situation where the capillary 2 is damaged due to the short extension distance.
[0026] When using capillary adapter 1 to connect capillary tube 2 to the sample injection component, capillary tube 2 can be inserted into capillary adapter 1 first, and then capillary adapter 1 can be held and connected to the sample injection component to achieve connection between the sample injection component and capillary tube 2, so that the injection needle 31 can pick up the sample in capillary tube 2. Of course, in some embodiments, after capillary adapter 1 is connected to the sample injection component, when replacing a new capillary tube 2, the previous capillary tube 2 can be directly pulled out and the new capillary tube 2 can be inserted into capillary adapter 1 without separating capillary adapter 1 from the sample injection component.
[0027] In some embodiments, the capillary adapter 1 can be made of a highly sealing and elastic material, such as silicone. Because the capillary adapter 1 is elastic, it reduces the pressure of external force on the capillary 2 when the capillary adapter 1 is held for docking, thereby extending the service life of the capillary 2 and preventing it from breaking.
[0028] In some embodiments, the capillary adapter 1 may be transparent. When the capillary 2 is inserted into the second end of the through hole 30 through the capillary adapter 1, the depth of insertion of the capillary 2 can be observed through the transparent capillary adapter 1 to determine the position where the end of the capillary 2 near the docking groove 40 reaches the clamping section 10.
[0029] like Figure 4 As shown, the through hole 30 has a clamping section 10. The clamping section 10 is used to fix the capillary tube 2 when it is inserted into the capillary adapter 1. The radial dimension of the clamping section 10 is smaller than the outer diameter of the capillary tube 2, and it is located at one end of the through hole 30 near the bottom of the docking groove 40. The material of the capillary adapter 1 is slightly elastic. Therefore, when the capillary tube 2 is inserted into the clamping section 10 of the through hole 30, the inner wall of the capillary adapter 1 at the clamping section 10 is squeezed by the capillary tube 2 and undergoes slight deformation. This allows the clamping section 10 to achieve an interference fit with the capillary tube 2. After the capillary tube 2 is inserted into the capillary adapter 1 and docked with the sample injection component, a sealed channel is formed between the capillary tube 2, the capillary adapter 1, and the sample injection component. This reduces the extraction of air when the injection needle 31 takes the sample from the capillary tube 2.
[0030] Optionally, the clamping section 10 has a certain length so that when the inspector inserts the capillary tube 2 into the capillary adapter 1, as the radial dimension of the clamping section 10 is smaller than the outer diameter of the capillary tube 2, the inspector may feel increased resistance to further inserting the capillary tube 2, thus prompting the inspector to reduce the force. Furthermore, the length of the clamping section 10 also reduces the probability that the tip of the capillary tube 2 will protrude through the through hole 30 of the capillary adapter 1, thereby preventing the capillary tube 2 from being subjected to the force of the sample injection component during docking.
[0031] Please refer to it again. Figure 4To facilitate the insertion of the capillary tube 2 into the capillary adapter 1, the through hole 30 also has a guide section 20. The radial dimension of the guide section 20 of the through hole 30 is larger than the outer diameter of the capillary tube 2, and it is located at the end of the through hole 30 away from the bottom of the mating groove 40. The clamping section 10 of the through hole 30 and the guide section 20 are connected. That is, when the capillary tube 2 is inserted into the capillary adapter 1, the capillary tube 2 first passes through the guide section 20, and then is tightly connected to the capillary adapter 1 at the clamping section 10. The radial dimension of the guide section 20 is larger than the outer diameter of the capillary tube 2, which facilitates the capillary tube 2 to pass through the guide section 20 and reach the clamping section 10.
[0032] Optionally, the inner wall of the guide section 20 gradually moves away from the central axis of the capillary adapter 1 from the clamping section 10 in a direction away from the docking groove 40, forming a first guide slope 21 with a gradually increasing inner diameter of the through hole 30. Since the radial dimension of the clamping section 10 is smaller than the outer diameter of the capillary 2, directly inserting the capillary 2 into the smaller hole section may generate a large compressive force on the capillary 2. Therefore, the first guide slope 21 can be used to guide the capillary 2 into the clamping section 10 with a smaller radial dimension.
[0033] Optionally, the inner wall of the guide section 20 gradually approaches the central axis of the capillary adapter 1 from the second end of the capillary adapter 1 toward the docking groove 40, forming a second guide slope 23 with a gradually decreasing inner diameter of the through hole 30. By setting the second guide slope 23, it is convenient to insert the capillary 2 into the capillary adapter 1, and the capillary 2 can be guided to be inserted into the clamping section 10.
[0034] Furthermore, by providing a first guide slope 21 and a second guide slope 23, a limiting segment 22 with a radial dimension larger than but close to the outer diameter of the capillary tube 2 can be provided between the first guide slope 21 and the second guide slope 23. This limiting segment 22 is provided to restrict the capillary tube 2 after it is inserted into the capillary adapter 1, reducing the swaying of the capillary tube 2 after insertion into the capillary adapter 1, thereby protecting the capillary tube 2. Optionally, the length of the guide segment 20 can be greater than the length of the first guide slope 21 and the second guide slope 23. The length of the first guide slope 21 can be relatively short so that the radial dimension of the guide segment 20 connected to the first guide slope 21 is not too large.
[0035] Optionally, the length of the first guide ramp 21 may be less than the length of the second guide ramp 23.
[0036] Optionally, the bottom of the docking groove 40 has a protrusion 41, and the first end of the through hole 30 passes through the protrusion 41, which matches the concave surface of the tip of the injection needle body 32. By providing a protrusion 41 at the bottom of the docking groove 40 of the capillary adapter 1, and by having the protrusion 41 match the concave surface of the tip of the injection needle body 32, it is convenient to dock the capillary 2 with the injection assembly and the tightness of the docking between the capillary adapter 1 and the injection assembly can be improved. Furthermore, since the first end of the through hole 30 passes through the protrusion 41, when the capillary 2 is inserted into the clamping section 10 of the capillary adapter 1, a sealed channel is formed between the capillary adapter 1, the capillary 2, and the injection assembly, thereby improving the airtightness of the injection needle 31 when extracting the sample from the capillary 2.
[0037] Optionally, the protrusion 41 is conical in shape.
[0038] Optionally, to ensure a tight fit between the sample introduction assembly and the capillary adapter 1, the sidewall of the docking groove 40 can be segmented axially along the capillary adapter 1. For example... Figure 4 As shown, the sidewall of the docking groove 40 has a first segment 42, a second segment 43, and a third segment 44 along the axial direction of the capillary adapter 1. The first segment 42 and the third segment 44 are parallel to the central axis of the capillary adapter 1. The second segment 43 connects the first segment 42 and the third segment 44. The first segment 42 is closer to the bottom of the docking groove 40 and the central axis of the capillary adapter 1 than the third segment 44. By providing the first segment 42, the second segment 43, and the third segment 44 along the axial direction of the capillary adapter 1 on the sidewall of the docking groove 40, and by having the first segment 42 be closer to the bottom of the docking groove 40 and the central axis of the capillary adapter 1 than the third segment 44, it is convenient for the head end of the sample injection component to enter the docking groove 40 through the first segment 42 with a larger radial dimension on the sidewall of the docking groove 40, and to be tightly docked with the docking groove 40 through the third segment 44 with a smaller radial dimension, thereby facilitating the docking of the sample injection component with the capillary adapter 1.
[0039] Accordingly, to ensure a tight connection between the injection assembly and the capillary adapter 1, a corresponding arrangement can also be made on the outer wall of the tip of the injection needle body 32. Specifically, the outer wall of the tip of the injection needle body 32 has a first surface 35, a second surface 34, and a third surface 33 in the axial direction. At least a portion of the first surface 35 abuts against the first segment 42 of the docking groove 40, at least a portion of the second surface 34 abuts against the second segment 43 of the docking groove 40, and at least a portion of the third surface 33 abuts against the third segment 44 of the docking groove 40. The first surface 35 and the third surface 33 are parallel, and the second surface 34 connects the first surface 35 and the third surface 33. Thus, the tip of the injection needle body 32 matches and is tightly connected with the docking groove 40 of the capillary adapter 1, forming a sealed channel between the capillary adapter 1 and the injection component after docking. This prevents the injection needle 31 from drawing air when it extends to draw the sample from the capillary 2, thus preventing the generation of air bubbles in the drawn sample. This improves the accuracy of the detection and enhances the quality of the medical testing equipment.
[0040] Optionally, the second face 34 can be composed of multiple faces.
[0041] like Figure 2 and Figure 3 As shown in the embodiment of the capillary adapter applied to medical testing equipment in this application, the capillary adapter 1 includes a first end and a second end, and a through hole 30 passing through the first end and the second end. The end face of the first end has a mating groove 40 adapted to the head of the injection needle 31. The through hole 30 is used to hold the capillary 2 at least at one end adjacent to the bottom of the mating groove 40.
[0042] For details regarding the capillary adapter 1 described in the embodiment of the capillary adapter used in medical testing equipment in this application, please refer to the relevant description of the capillary adapter 1 in the above-described sample injection component embodiment, which will not be repeated here.
[0043] In summary, this application provides a capillary adapter with a first end and a second end, as well as a through hole penetrating both ends. The first end has a mating groove adapted to the end of the injection needle. This allows the capillary adapter to tightly engage with the injection needle body via the mating groove, preventing air extraction during sample collection from the capillary and ensuring the sample is free of air bubbles. This improves the quality of samples entering the medical testing equipment and consequently enhances the accuracy of sample detection. Furthermore, the through hole of the capillary adapter, at least at the end near the bottom of the mating groove, is used to hold the capillary. This allows for direct connection between the capillary and injection needle assembly by hand, eliminating the need to manipulate the capillary itself. The pressure previously borne by the capillary during connection is transferred to the adapter, reducing the pressure on the capillary and preventing rupture. This approach preserves the sample and protects personnel, mitigating the risk of sample infection.
[0044] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.
Claims
1. A medical testing device, characterized in that, include: A syringe assembly having a syringe body and a syringe extending from the tip of the syringe body; A capillary adapter has a first end and a second end, and a through hole passing through the first end and the second end. The first end face of the capillary adapter has a mating groove that adapts to the end of the injection needle. The through hole is used to hold the capillary at one end near the bottom of the mating groove. The through hole has a clamping section for fixing the capillary when it is inserted into the capillary adapter. The radial dimension of the clamping section is smaller than the outer diameter of the capillary and is located at one end of the through hole near the bottom of the docking groove. After the capillary is inserted into the capillary adapter and docked with the injection needle assembly, a sealed channel is formed between the capillary, the capillary adapter and the injection needle assembly, so as to reduce the extraction of air when the injection needle takes the sample in the capillary.
2. The medical testing equipment according to claim 1, characterized in that, The through hole has a guide section, the radial dimension of which is larger than the outer diameter of the capillary, and is located at one end of the through hole away from the bottom of the docking groove; the clamping section and the guide section are connected. The inner wall of the guide section gradually moves away from the central axis of the capillary adapter from the clamping section in a direction away from the docking groove, forming a first guide slope with a gradually increasing inner diameter of the through hole; The inner wall of the guide section gradually approaches the central axis of the capillary adapter from the second end of the capillary adapter toward the docking groove, forming a second guide slope with a gradually decreasing inner diameter of the through hole.
3. The medical testing device according to claim 1 or 2, characterized in that, The bottom of the docking groove has a protrusion, the through hole passes through the protrusion, and the protrusion matches the concave surface extending from the tip of the injection needle body.
4. The medical testing equipment according to claim 3, characterized in that, The protrusion is cone-shaped.
5. The medical testing equipment according to claim 3, characterized in that, The walls of the concave surface gradually expand outwards.
6. The medical testing equipment according to claim 3, characterized in that, The sidewall of the docking groove has a first section, a second section, and a third section along the axial direction of the capillary adapter. The first section and the third section are parallel to the central axis of the capillary adapter. The second section connects the first section and the third section. The first section is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third section. The outer wall of the tip of the injection needle body has a first surface, a second surface, and a third surface in the axial direction. At least a portion of the first surface abuts against the first section of the docking groove, at least a portion of the second surface abuts against the second section of the docking groove, and at least a portion of the third surface abuts against the third section of the docking groove. The first surface and the third surface are parallel, and the second surface connects the first surface and the third surface.
7. The medical testing equipment according to any one of claims 1-2 and 4-6, characterized in that, The bottom of the docking groove has a protrusion, the through hole passes through the protrusion, and the protrusion matches the concave surface extending from the tip of the injection needle body; The medical testing equipment is used for blood gas analysis. When there is a certain angle between the central axis of the injection needle and the central axis of the capillary, the needle tip of the injection needle does not contact the inner wall of the capillary to avoid damage to the capillary and the injection needle can extract the sample from the capillary.
8. The medical testing equipment according to any one of claims 1-2 and 4-6, characterized in that, The injection needle tip does not contact the inner wall of the capillary.
9. The medical testing equipment according to claim 3, characterized in that, The through hole has a guide section, the radial dimension of which is larger than the outer diameter of the capillary, and is located at one end of the through hole away from the bottom of the docking groove; the clamping section and the guide section are connected. The inner wall of the guide section gradually moves away from the central axis of the capillary adapter from the clamping section in a direction away from the docking groove, forming a first guide slope with a gradually increasing inner diameter of the through hole; The inner wall of the guide section gradually approaches the central axis of the capillary adapter from the second end of the capillary adapter toward the docking groove, forming a second guide slope with a gradually decreasing inner diameter of the through hole. The sidewall of the docking groove has a first section, a second section, and a third section along the axial direction of the capillary adapter. The first section and the third section are parallel to the central axis of the capillary adapter. The second section connects the first section and the third section. The first section is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third section. The outer wall of the tip of the injection needle body has a first surface, a second surface, and a third surface in the axial direction. At least a portion of the first surface abuts against the first section of the docking groove, at least a portion of the second surface abuts against the second section of the docking groove, and at least a portion of the third surface abuts against the third section of the docking groove. The first surface and the third surface are parallel, and the second surface connects the first surface and the third surface.
10. The medical testing device according to any one of claims 1-2 and 4-6, characterized in that, The capillary adapter is made of silicone and is transparent.
11. A capillary adapter for use in medical testing equipment, characterized in that, The capillary adapter is dockable with the injection needle assembly. The injection needle assembly has an injection needle body and an injection needle extending from the tip of the injection needle body. The capillary adapter has a first end and a second end, and a through hole penetrating the first end and the second end. The first end face of the capillary adapter has a mating groove adapted to the tip of the injection needle. The end of the through hole near the bottom of the mating groove is used to clamp the capillary. The through hole has a clamping section for fixing the capillary when it is inserted into the capillary adapter. The radial dimension of the clamping section is smaller than the outer diameter of the capillary and is located at the end of the through hole near the bottom of the mating groove. After the capillary is inserted into the capillary adapter and docked with the injection needle assembly, a sealed channel is formed between the capillary, the capillary adapter, and the injection needle assembly, so as to reduce the extraction of air when the injection needle takes the sample in the capillary.
12. The capillary adapter according to claim 11, characterized in that, The through hole has a guide section, the radial dimension of which is larger than the outer diameter of the capillary, and is located at one end of the through hole away from the bottom of the docking groove; the clamping section and the guide section are connected. The inner wall of the guide section gradually moves away from the central axis of the capillary adapter from the clamping section in a direction away from the docking groove, forming a first guide slope with a gradually increasing inner diameter of the through hole; The inner wall of the guide section gradually approaches the central axis of the capillary adapter from the second end of the capillary adapter toward the docking groove, forming a second guide slope with a gradually decreasing inner diameter of the through hole.
13. The capillary adapter according to any one of claims 11-12, characterized in that, The bottom of the docking groove has a protrusion, and the through hole passes through the protrusion.
14. The capillary adapter according to claim 13, characterized in that, The sidewall of the docking groove has a first section, a second section, and a third section along the axial direction of the capillary adapter. The first section and the third section are parallel to the central axis of the capillary adapter. The second section connects the first section and the third section. The first section is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third section.
15. The capillary adapter according to claim 11, characterized in that, The through hole has a guide section, the radial dimension of which is larger than the outer diameter of the capillary, and is located at one end of the through hole away from the bottom of the docking groove; the clamping section and the guide section are connected. The inner wall of the guide section gradually moves away from the central axis of the capillary adapter from the clamping section in a direction away from the docking groove, forming a first guide slope with a gradually increasing inner diameter of the through hole; The inner wall of the guide section gradually approaches the central axis of the capillary adapter from the second end of the capillary adapter toward the docking groove, forming a second guide slope with a gradually decreasing inner diameter of the through hole. The sidewall of the docking groove has a first section, a second section, and a third section along the axial direction of the capillary adapter. The first section and the third section are parallel to the central axis of the capillary adapter. The second section connects the first section and the third section. The first section is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third section.
16. The capillary adapter according to any one of claims 11-12 and 14-15, characterized in that, The capillary adapter is made of silicone and is transparent.
17. A sample injection needle assembly, characterized in that, The injection needle assembly is capable of docking with the capillary adapter as described in any one of claims 11 to 16. The injection needle assembly has an injection needle body and an injection needle extending from the tip of the injection needle body. After the capillary is inserted into the capillary adapter and docked with the injection needle assembly, a sealed channel is formed between the capillary, the capillary adapter, and the injection needle assembly to reduce air extraction when the injection needle takes a sample from the capillary.
18. The injection needle assembly according to claim 17, characterized in that, The tip of the injection needle body extends into a concave surface, and the bottom of the docking groove of the capillary adapter has a convex portion. The through hole penetrates the convex portion, and the convex portion matches the concave surface extending from the tip of the injection needle body.
19. The injection needle assembly according to claim 18, characterized in that, The protrusion is cone-shaped.
20. The injection needle assembly according to claim 18, characterized in that, The walls of the concave surface gradually expand outwards.
21. The injection needle assembly according to any one of claims 17-20, characterized in that, The sidewall of the docking groove has a first section, a second section, and a third section along the axial direction of the capillary adapter. The first section and the third section are parallel to the central axis of the capillary adapter. The second section connects the first section and the third section. The first section is closer to the bottom of the docking groove and the central axis of the capillary adapter than the third section. The outer wall of the tip of the injection needle body has a first surface, a second surface, and a third surface in the axial direction. At least a portion of the first surface abuts against the first section of the docking groove, at least a portion of the second surface abuts against the second section of the docking groove, and at least a portion of the third surface abuts against the third section of the docking groove. The first surface and the third surface are parallel, and the second surface connects the first surface and the third surface.