Ceramic micro-sampling needle

Abstract

The utility model relates to liquid adding tool technical field discloses a kind of ceramic trace sample adding needle, including syringe, push rod and needle, the outer wall of push rod is slid in the inside of syringe, the top of needle is engaged with the bottom end of syringe, the inner wall of push rod is provided with fine adjustment mechanism, the fine adjustment mechanism is used for trace adjustment when injection, the outer wall of syringe is provided with preliminary prompt mechanism, the preliminary prompt mechanism is used for quick feedback when preliminary extrusion is in place, the outer wall bottom end of syringe is provided with auxiliary anti-bending mechanism, the auxiliary anti-bending mechanism is used for not bending when insertion. In the utility model, by inserting needle into target position, pressing push rod extruding medicament, waiting for secondary piston and primary piston to move to preliminary position, rotating push rod upper turntable, under the action of screw thread and fixed cylinder, limiting strip limit, lead screw drives secondary piston to move down, to realize medicament fine extrusion.

Description

Technical Field

[0001] This utility model relates to the field of liquid addition tool technology, and in particular to a ceramic micro-sampling needle. Background Technology

[0002] In the fields of biological experiments, chemical analysis, and medical testing, the precise addition of trace amounts of liquid samples is a core element in ensuring the accuracy of experimental results and the reliability of detection. Ceramic micro-pipettes, as key tools for achieving this operation, effectively reduce sample residue and cross-contamination due to the excellent corrosion resistance, low adsorption, and structural stability of ceramic materials. They are widely used in scenarios involving the dispensing of trace reagents and the dilution of samples. As the core execution component connecting reagent storage containers and reaction carriers, their performance directly determines the accuracy and efficiency of the sample addition operation.

[0003] Early micro-volume syringes mostly used a combination of a single piston and syringe, relying solely on pushing or pulling the piston to extract and expel samples. This design has significant limitations in practical use: firstly, the movement of the single piston is difficult to control precisely, especially in fine-scale sampling scenarios requiring nano- or micro-volume dispensing, where manual pressure deviations can easily lead to large fluctuations in the dispensing volume; secondly, the lack of a limiting and feedback mechanism for piston movement makes it impossible to promptly indicate whether the preset volume has been reached, often resulting in reagent waste or sample contamination due to excessive pressing or pulling. To address these issues, syringes with preliminary positioning structures have gradually emerged in existing technologies. By setting graduations and simple latches on the outside of the syringe, these assist operators in judging the dispensing volume and limiting excessive piston movement, thus improving dispensing accuracy to some extent. However, existing devices still have significant shortcomings. Although existing sampling needles achieve the transfer of micro-liquids through the basic structure of "piston-cylinder" and avoid the problem of non-directional transfer of early tools, they rely solely on the overall movement of a single piston to complete the sample addition. This makes it impossible to perform secondary fine adjustments after the initial sample addition, which is difficult to meet the stringent requirements of high-precision experiments for sample addition accuracy. At the same time, the piston drive components of existing devices are mostly integrated designs. During the drive process, the piston will deviate due to the lack of stable guiding and limiting structures, which will further lead to deviations in the sample addition amount and make it impossible to guarantee the consistency and reliability of micro-sample addition operations. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a ceramic micro-volume sampling needle, which aims to improve the problem that the existing technology relies on the overall movement of a single piston, which cannot be finely adjusted and is difficult to meet the requirements of high-precision experiments for sampling accuracy and consistency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a ceramic micro-volume injection needle, comprising an injection cylinder, a push rod, and a needle tip. The outer wall of the push rod slides inside the injection cylinder, and the top of the needle tip engages with the bottom end of the injection cylinder. A fine-tuning mechanism is provided on the inner wall of the push rod for micro-adjustment during injection. A preliminary indication mechanism is provided on the outer wall of the injection cylinder for rapid feedback when the initial compression is in place. An auxiliary anti-bending mechanism is provided at the bottom end of the outer wall of the injection cylinder to prevent bending during insertion. The fine-tuning mechanism includes a turntable, the outer wall of which is rotatably connected to the top of the inner wall of the push rod. A rotating cylinder is fixedly connected to the bottom end of the turntable. A lead screw is threadedly connected to the bottom end of the inner wall of the rotating cylinder. Multiple limiting strips are fixedly connected to the outer wall of the lead screw. A primary piston is fixedly connected to the bottom end of the push rod. A fixed cylinder is fixedly connected to the inner wall of the primary piston. The inner wall of the fixed cylinder is slidably connected to the outer walls of the multiple limiting strips. A secondary piston is fixedly connected to the bottom end of the lead screw.

[0006] As a further description of the above technical solution: The preliminary indication mechanism includes two arc-shaped clamps. The inner walls of the two arc-shaped clamps are respectively located on the left and right sides of the outer wall of the syringe. The inner wall of the right arc-shaped clamp is rotatably connected with a bolt, and the inner wall of the left arc-shaped clamp is fixedly connected with a nut. The left end of the bolt passes through the inner side of both arc-shaped clamps and is threaded to the inner wall of the nut. Arc-shaped magnetic strips are fixedly connected to the middle of the inner walls of both arc-shaped clamps. An indicator block is fixedly connected to the front side of the arc-shaped clamps. A magnetic ring is fixedly connected to the middle of the outer wall of the first-stage piston.

[0007] As a further description of the above technical solution: The auxiliary anti-bending mechanism includes a locking ring, the inner wall of which is disposed at the bottom end of the outer wall of the syringe, the inner wall of which engages with the bottom end of the outer wall of the syringe, a support plate is fixedly connected to the bottom end of the locking ring, a limiting cylinder is fixedly connected to the front side of the support plate, a buffer spring is fixedly connected to the bottom end of the limiting cylinder, and a conical cylinder is fixedly connected to the bottom end of the buffer spring, the outer wall of the needle penetrating through the inner walls of the limiting cylinder and the conical cylinder.

[0008] As a further description of the above technical solution: The inner wall of the rotating cylinder is provided with an internal thread, and the outer wall of the lead screw is provided with an external thread. The internal thread of the inner wall of the rotating cylinder is compatible with the external thread of the outer wall of the lead screw.

[0009] As a further description of the above technical solution: Multiple limiting strips are evenly distributed along the circumferential direction of the outer wall of the lead screw. The inner wall of the fixed cylinder is provided with a sliding groove that matches the limiting strips. The outer wall of the limiting strip is slidably connected to the sliding groove in the inner wall of the fixed cylinder.

[0010] As a further description of the above technical solution: The surface of the indicator block is provided with anti-slip texture, and the position of the indicator block corresponds to the position of the arc-shaped magnetic strip.

[0011] As a further description of the above technical solution: The outer diameter of the magnetic ring is adapted to the inner diameter of the injection cylinder, and the outer wall of the magnetic ring is slidably connected to the inner wall of the injection cylinder.

[0012] As a further description of the above technical solution: The inner diameter of the limiting cylinder is adapted to the outer diameter of the needle, and the outer wall of the needle is slidably connected to the inner wall of the limiting cylinder.

[0013] As a further description of the above technical solution: The inner diameter of the top end of the conical cylinder is the same as the inner diameter of the limiting cylinder, and the inner diameter of the bottom end of the conical cylinder is smaller than its top end inner diameter.

[0014] As a further description of the above technical solution: A pressing block is fixedly connected to the top of the push rod, and the outer wall of the pressing block is provided with anti-slip protrusions.

[0015] This utility model has the following beneficial effects: 0. In this utility model, the secondary piston is attached to the primary piston and located at the bottom of the inner wall of the injection cylinder. The needle is inserted into the medicine, and the push rod is pulled upward. The medicine is drawn into the injection cylinder under negative pressure. The device is taken out, the needle is inserted into the target position, and the push rod is pressed to squeeze the medicine. When the secondary piston and the primary piston move to the initial position, the turntable above the push rod is rotated, which drives the rotating cylinder to rotate. Under the action of the thread and the limitation of the fixed cylinder and the limiting strip, the screw drives the secondary piston to move downward, thereby realizing the fine extrusion of the medicine.

[0016] 1. In this utility model, the arc-shaped clamp is loosened by rotating the bolt and slid until the indicator block is aligned with the scale of the syringe. Then the bolt is rotated to fix it. When drawing out, the magnetic ring on the outside of the first-stage piston is aligned with the arc-shaped magnetic strip on the inside of the arc-shaped clamp to generate an adsorption force. When the resistance increases, the drawing stops to avoid drawing out too much medicine. When injecting, the operation of adjusting the arc-shaped clamp is repeated. When pressing the push rod, the pressing stops when the resistance increases, thereby preventing the medicine from being squeezed out in excess.

[0017] 2. In this utility model, by engaging the locking ring at the bottom of the outer wall of the syringe, the needle passes through the limiting cylinder and the conical cylinder. When the needle is inserted, the conical cylinder provides vertical support and guidance. As the needle is inserted, the conical cylinder is compressed, causing the buffer spring to contract, thereby ensuring that the needle is subjected to uniform force and avoiding bending or breakage. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of a ceramic micro-sampling needle proposed in this utility model; Figure 2 This is a front view of a ceramic micro-sampling needle proposed in this utility model; Figure 3 This is a rear view of a ceramic micro-volume sampling needle proposed in this utility model; Figure 4 This is a cross-sectional view of the fine-tuning mechanism of a ceramic micro-sampling needle proposed in this utility model; Figure 5 for Figure 4 A magnified view of point A; Figure 6 This is a partial structural cross-sectional view of a ceramic micro-sampling needle proposed in this utility model; Figure 7 This is a schematic diagram of the preliminary indication mechanism of a ceramic micro-volume sampling needle proposed in this utility model; Figure 8 This is a schematic diagram of an auxiliary anti-bending mechanism for a ceramic micro-sample dispensing needle proposed in this utility model.

[0019] Legend: 1. Injector; 2. Fine-tuning mechanism; 21. Turntable; 22. Rotating cylinder; 23. Lead screw; 24. Limiting strip; 25. Fixing cylinder; 26. First-stage piston; 27. Second-stage piston; 3. Preliminary indication mechanism; 31. Arc-shaped clamp; 32. Bolt; 33. Nut; 34. Arc-shaped magnetic strip; 35. Indicator block; 36. Magnetic ring; 4. Auxiliary anti-bending mechanism; 41. Engaging ring; 42. Support plate; 43. Limiting cylinder; 44. Buffer spring; 45. Conical cylinder; 5. Push rod; 6. Needle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figure 1-3The present invention provides an embodiment of a ceramic micro-volume injection needle, comprising an injection cylinder 1, a push rod 5, and a needle 6. The outer wall of the push rod 5 slides inside the injection cylinder 1, and the top of the needle 6 engages with the bottom of the injection cylinder 1. The inner wall of the push rod 5 is provided with a fine-tuning mechanism 2, which is used for micro-adjustment during injection. The outer wall of the injection cylinder 1 is provided with a preliminary indication mechanism 3, which is used for rapid feedback when the initial compression is in place. The bottom of the outer wall of the injection cylinder 1 is provided with an auxiliary anti-bending mechanism 4, which is used to prevent bending during insertion. The fine-tuning mechanism 2 includes a turntable 21, the outer wall of which is rotatably connected to the top of the inner wall of the push rod 5. A rotating cylinder 22 is fixedly connected to the bottom of the turntable 21. A lead screw 23 is threadedly connected to the bottom of the inner wall of the rotating cylinder 22. Multiple limiting strips 24 are fixedly connected to the outer wall of the lead screw 23. A first-stage piston 26 is fixedly connected to the bottom of the push rod 5. A fixed cylinder 25 is fixedly connected to the inner wall of the first-stage piston 26. The inner wall of the fixed cylinder 25 is slidably connected to the outer wall of the multiple limiting strips 24. A second-stage piston 27 is fixedly connected to the bottom of the lead screw 23. The inner wall of the rotating cylinder 22 is provided with an internal thread, and the outer wall of the lead screw 23 is provided with an external thread. The internal thread of the inner wall of the rotating cylinder 22 is adapted to the external thread of the outer wall of the lead screw 23. This thread adaptation design can stably convert the rotational motion of the rotating cylinder 22 into the axial linear motion of the lead screw 23, ensuring the smoothness and accuracy of the downward movement of the secondary piston 27, and avoiding displacement deviation caused by excessive thread clearance. Multiple limiting strips 24 are evenly distributed along the circumferential direction of the outer wall of the lead screw 23. The inner wall of the fixed cylinder 25 is provided with a sliding groove adapted to the limiting strips 24, and the outer wall of the limiting strips 24 is slidably connected to the fixed cylinder 25. In the groove on the inner wall of the cylinder 25, the evenly distributed limiting strips 24 cooperate with the matching grooves to provide circumferential limiting for the lead screw 23, preventing the lead screw 23 from rotating synchronously with the rotating cylinder 22, and retaining only the axial movement trajectory, thus ensuring the uniqueness of the movement direction of the secondary piston 27 during fine adjustment; a pressing block is fixedly connected to the top of the push rod 5, and anti-slip protrusions are provided on the outer wall of the pressing block. The pressing block provides the operator with a clear point of force application, while the anti-slip protrusions increase the friction between the hand and the pressing block, preventing slippage when pressing or pulling the push rod 5, and improving the stability and convenience of operation; Specifically, in the initial state, the secondary piston 27 and the primary piston 26 are in close contact with each other and are located at the bottom of the inner wall of the injection cylinder 1. At this time, the needle 6 is inserted into the medicine, and then the push rod 5 is pulled out towards the top. At this time, a negative pressure is generated inside the injection cylinder 1, and the medicine is drawn into the injection cylinder 1. Then the entire device is removed from the medicine, and the needle 6 is inserted into the target injection position. Then the push rod 5 is pressed to squeeze the medicine. After the secondary piston 27 and the primary piston 26 move to the initially set position, the turntable 21 above the push rod 5 is rotated. The rotation of the turntable 21 will drive the rotating cylinder 22 to rotate synchronously. Due to the effect of the thread, plus the limiting effect of the fixed cylinder 25 and the limiting strip 24, the screw 23 will drive the secondary piston 27 to move downward, thereby realizing the fine extrusion operation of the medicine.

[0022] See appendix Figure 1 Appendix Figure 5 and attached Figure 7 The preliminary indication mechanism 3 includes two arc-shaped clamps 31. The inner walls of the two arc-shaped clamps 31 are respectively set on the left and right sides of the outer wall of the syringe 1. The inner wall of the right arc-shaped clamp 31 is rotatably connected with a bolt 32, and the inner wall of the left arc-shaped clamp 31 is fixedly connected with a nut 33. The left end of the bolt 32 passes through the inner side of both arc-shaped clamps 31 and is threadedly connected to the inner wall of the nut 33. Arc-shaped magnetic strips 34 are fixedly connected to the middle of the inner walls of both arc-shaped clamps 31. An indicator block 35 is fixedly connected to the front side of the arc-shaped clamps 31. A magnetic ring 36 is fixedly connected to the middle of the outer wall of the first-stage piston 26. The surface of the indicator block 35 is provided with anti-slip texture. The position of the indicator block 35 corresponds to the position of the arc-shaped magnetic strip 34. The anti-slip texture can increase the friction of the operator's hand when adjusting the indicator block 35, making it convenient to accurately slide the arc-shaped clamp 31 to align with the scale. The correspondence between the position of the indicator block 35 and the arc-shaped magnetic strip 34 allows the operator to directly judge the position of the arc-shaped magnetic strip 34 by observing the position of the indicator block 35, without having to search for the magnetic strip position, thus improving operating efficiency. The outer diameter of the magnetic ring 36 is adapted to the inner diameter of the syringe 1. The outer wall of the magnetic ring 36 is slidably connected to the inner wall of the syringe 1. The outer diameter adaptation design ensures that the magnetic ring 36 always fits against the syringe wall when moving inside the syringe 1, avoiding the magnetic ring 36 from shifting due to gaps. The sliding connection method ensures that the magnetic ring 36 moves synchronously and smoothly with the first-stage piston 26, ensuring precise alignment with the arc-shaped magnetic strip 34 to generate adsorption feedback. Specifically, before the formal drug extraction operation, first rotate the bolt 32 on the device to loosen the arc-shaped clamp 31. Then, slide the arc-shaped clamp 31 along the predetermined track until the indicator block 35 is aligned with the scale on the syringe 1. After alignment, rotate the bolt 32 again to fix the arc-shaped clamp 31. When extracting the drug, the magnetic ring 36 installed on the outside of the first-stage piston 26 will align with the arc-shaped magnetic strip 34 set on the inside of the arc-shaped clamp 31, generating a certain attraction force. When the operator feels the resistance gradually increasing, immediately stop the pulling action to avoid extracting too much drug and ensure the accuracy of the drug dosage. When performing the drug injection operation, repeat the previous operation procedure of adjusting the arc-shaped clamp 31. When pressing the push rod 5, when the operator notices the resistance starting to increase, stop pressing to prevent the drug from being squeezed out in excess, thereby ensuring the accuracy of the injected drug dosage and avoiding adverse effects on the treatment effect due to too much or too little drug dosage.

[0023] See appendix Figure 2 Appendix Figure 3 and attached Figure 8 The auxiliary anti-bending mechanism 4 includes a locking ring 41. The inner wall of the locking ring 41 is located at the bottom of the outer wall of the injection cylinder 1. The inner wall of the locking ring 41 is locked with the bottom of the outer wall of the injection cylinder 1. A support plate 42 is fixedly connected to the bottom of the locking ring 41. A limiting cylinder 43 is fixedly connected to the front side of the support plate 42. A buffer spring 44 is fixedly connected to the bottom of the limiting cylinder 43. A conical cylinder 45 is fixedly connected to the bottom of the buffer spring 44. The outer wall of the needle 6 penetrates the inner walls of the limiting cylinder 43 and the conical cylinder 45. The inner diameter of the limiting cylinder 43 is adapted to the outer diameter of the needle 6. The outer wall of the needle 6 is slidably connected to the inner wall of the limiting cylinder 43. The inner diameter adaptation design allows the limiting cylinder 43 to tightly wrap the needle 6, forming a stable radial support for the middle of the needle 6 and preventing the needle 6 from shifting laterally during insertion. The sliding connection method ensures that the needle 6 can be inserted or removed normally without affecting the smoothness of the sample addition operation. The inner diameter of the top of the conical cylinder 45 is the same as the inner diameter of the limiting cylinder 43. The inner diameter of the bottom of the conical cylinder 45 is smaller than its top inner diameter. The consistent top inner diameter allows the conical cylinder 45 and the limiting cylinder 43 to connect seamlessly, ensuring the continuity of the needle 6 when it passes through. The conical structure with a smaller bottom inner diameter can accurately guide the needle 6 to enter in the vertical direction when it is inserted into the container, while reducing obstruction at the container opening and improving the stability of the insertion process. Specifically, the locking ring 41 is first locked at the bottom of the outer wall of the syringe 1 to ensure that the needle 6 can smoothly penetrate the limiting cylinder 43 and the conical cylinder 45. When the needle 6 is inserted, the conical cylinder 45 plays an important role in vertical support and guidance. As the needle 6 is continuously inserted inward, the conical cylinder 45 will be subjected to pressure from the needle 6. At this time, the buffer spring 44 begins to contract to ensure that the force on the needle 6 is uniform during the insertion process, thereby avoiding bending or breakage of the needle 6. This is a crucial guarantee for the smooth operation of the entire process.

[0024] Working principle: First, after completing the drug extraction and aligning the needle 6 with the target sample application position, the core execution step of micro-volume dispensing begins. Initially, the secondary piston 27 and the primary piston 26 are tightly fitted together and located at the bottom of the inner wall of the syringe 1. The needle 6 is inserted into the drug to be extracted, and the push rod 5 is slowly pulled upwards, creating a negative pressure inside the syringe 1. Under this negative pressure, the drug enters the syringe 1 along the needle 6 and is stored in the space below the piston. Then, the device is removed, and the needle 6 is precisely inserted into the reaction container or the target sample application point. The push rod 5 is pressed down, pushing the primary piston 26 and the secondary piston 27 downwards simultaneously, initially squeezing out the stored drug. After the primary piston 26 and the secondary piston 27 move to the preset initial sample application position, further control of the micro-volume dispensing is required. The agent is extruded by rotating the turntable 21 on the inner wall of the top of the push rod 5. The turntable 21 drives the rotating cylinder 22 fixed at its bottom to rotate synchronously. Since the inner wall of the rotating cylinder 22 is threadedly connected to the outer wall of the lead screw 23, and the multiple limiting strips 24 on the outer wall of the lead screw 23 slide in cooperation with the inner wall of the fixed cylinder 25 fixed to the inner wall of the first-stage piston 26, the rotation of the rotating cylinder 22 is converted into the axial downward movement of the lead screw 23, which in turn pushes the second-stage piston 27 at the bottom of the lead screw 23 to move down independently, so as to realize the micro- and precise extrusion of the agent. This retains the high efficiency of the first-stage piston 26 in quickly completing most of the agent injection, and with the help of the independent fine-tuning capability of the second-stage piston 27, it meets the precision requirements of high-precision experiments for nano- and micro-scale micro-sampling, effectively avoiding the problem that a single piston is difficult to accurately control micro-agents. Furthermore, through the preliminary prompting mechanism 3, before activating the fine-tuning mechanism 2 to extract the drug, before extracting the drug, first rotate the bolt 32 on the inner wall of the right arc-shaped clamp 31 in the preliminary prompting mechanism 3, so that the threaded connection between the bolt 32 and the nut 33 on the inner wall of the left arc-shaped clamp 31 is loosened, and the clamping force of the two arc-shaped clamps 31 on the syringe 1 is weakened. At this time, the two arc-shaped clamps 31 will slide along the outer wall of the syringe 1 until the indicator block 35 on the front side of the arc-shaped clamp 31 is aligned with the preset scale line on the outer wall of the syringe 1. Then rotate the bolt 32 in the opposite direction so that the two arc-shaped clamps 31 re-clamp the syringe 1 and fix its position. Subsequently, during the extraction operation, when the push rod 5 is pulled upward, the first-stage piston 26 moves upward synchronously. When the magnetic ring 36 in the middle of the outer wall of the first-stage piston 26 moves with the piston to the arc-shaped inner wall of the arc-shaped clamp 31, When the magnetic strip 34 is horizontally aligned, an adsorption force is generated between the magnetic ring 36 and the arc-shaped magnetic strip 34, which significantly increases the resistance to pulling the push rod 5. The operator can judge that a sufficient amount of medicine has been extracted by the change in resistance and stop pulling in time to avoid excessive extraction of medicine. At the same time, when the fine-tuning mechanism 2 performs the initial pressing injection, the above operation of adjusting the position of the arc-shaped clamp 31 is repeated. During the pressing of the push rod 5, when the magnetic ring 36 aligns with the arc-shaped magnetic strip 34 again and generates resistance, the pressing is stopped. After the initial injection is completed, the fine-tuning function of the fine-tuning mechanism 2 is activated, thereby providing accurate volume control prompts for the extraction and initial injection of the fine-tuning mechanism 2, avoiding medicine waste or sample volume deviation caused by operator feel deviation. At the same time, its adjustable characteristics are adapted to the sample addition requirements of different dosages, further improving the sample addition accuracy. Meanwhile, in the auxiliary anti-bending mechanism 4, before the fine-tuning mechanism 2 is activated, the locking ring 41 is aligned with the bottom end of the outer wall of the syringe 1, so that the inner wall of the locking ring 41 is tightly locked and fixed to the bottom end of the outer wall of the syringe 1. At this time, the needle 6 locked at the bottom end of the syringe 1 passes through the limiting cylinder 43 fixed to the front side of the support plate 42 below the locking ring 41, the buffer spring 44 connected to the bottom end of the limiting cylinder 43, and finally passes through the conical cylinder 45 fixed to the bottom end of the buffer spring 44, thus achieving the outer layer protection of the needle 6. When performing the extraction or injection operation, the open end of the conical cylinder 45 contacts the container first. The opening provides vertical guidance for the needle 6, ensuring that the needle 6 is inserted along a vertical path. As the needle 6 is continuously inserted, the conical cylinder 45 moves upward under the reaction force of the outer wall of the container, compressing the buffer spring 44. The elastic deformation of the buffer spring 44 can offset the impact force during the insertion process. At the same time, the limiting cylinder 43 always radially limits the middle part of the needle 6, preventing the needle 6 from bending due to the insertion angle deviation. This avoids equipment damage or sample placement deviation caused by the thin and easily bent needle 6 during operation, ensuring the structural integrity and insertion accuracy of the needle 6.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ceramic micro-volume injection needle, comprising an injection cylinder (1), a plunger (5), and a needle tip (6), characterized in that, The outer wall of the push rod (5) slides inside the syringe (1), the top of the needle (6) engages with the bottom of the syringe (1), the inner wall of the push rod (5) is provided with a fine adjustment mechanism (2), the fine adjustment mechanism (2) is used for fine adjustment during injection, the outer wall of the syringe (1) is provided with a preliminary prompting mechanism (3), the preliminary prompting mechanism (3) is used for quick feedback when the initial squeezing is in place, the bottom of the outer wall of the syringe (1) is provided with an auxiliary anti-bending mechanism (4), the auxiliary anti-bending mechanism (4) is used to prevent bending when inserted; The fine-tuning mechanism (2) includes a turntable (21), the outer wall of which is rotatably connected to the top of the inner wall of the push rod (5). A rotating cylinder (22) is fixedly connected to the bottom of the turntable (21). A lead screw (23) is threadedly connected to the bottom of the inner wall of the rotating cylinder (22). A plurality of limiting strips (24) are fixedly connected to the outer wall of the lead screw (23). A first-stage piston (26) is fixedly connected to the bottom of the push rod (5). A fixed cylinder (25) is fixedly connected to the inner wall of the first-stage piston (26). The inner wall of the fixed cylinder (25) is slidably connected to the outer wall of the plurality of limiting strips (24). A second-stage piston (27) is fixedly connected to the bottom of the lead screw (23).

2. The ceramic micro-sampling needle according to claim 1, characterized in that: The preliminary prompting mechanism (3) includes two arc-shaped clamps (31). The inner walls of the two arc-shaped clamps (31) are respectively located on the left and right sides of the outer wall of the syringe (1). The inner wall of the right arc-shaped clamp (31) is rotatably connected with a bolt (32), and the inner wall of the left arc-shaped clamp (31) is fixedly connected with a nut (33). The left end of the bolt (32) passes through the inner side of both arc-shaped clamps (31) and is threadedly connected to the inner wall of the nut (33). Arc-shaped magnetic strips (34) are fixedly connected to the middle of the inner walls of both arc-shaped clamps (31). An indicator block (35) is fixedly connected to the front side of the arc-shaped clamp (31). A magnetic ring (36) is fixedly connected to the middle of the outer wall of the first-stage piston (26).

3. The ceramic micro-volume sampling needle according to claim 1, characterized in that: The auxiliary anti-bending mechanism (4) includes a locking ring (41). The inner wall of the locking ring (41) is located at the bottom of the outer wall of the injection cylinder (1). The inner wall of the locking ring (41) engages with the bottom of the outer wall of the injection cylinder (1). A support plate (42) is fixedly connected to the bottom of the locking ring (41). A limiting cylinder (43) is fixedly connected to the front side of the support plate (42). A buffer spring (44) is fixedly connected to the bottom of the limiting cylinder (43). A conical cylinder (45) is fixedly connected to the bottom of the buffer spring (44). The outer wall of the needle (6) penetrates the inner wall of the limiting cylinder (43) and the conical cylinder (45).

4. A ceramic micro-volume sampling needle according to claim 1, characterized in that: The inner wall of the rotating cylinder (22) is provided with an internal thread, and the outer wall of the lead screw (23) is provided with an external thread. The internal thread of the inner wall of the rotating cylinder (22) is adapted to the external thread of the outer wall of the lead screw (23).

5. A ceramic micro-volume sampling needle according to claim 1, characterized in that: Multiple limiting strips (24) are evenly distributed along the circumferential direction of the outer wall of the lead screw (23). The inner wall of the fixed cylinder (25) is provided with a sliding groove that matches the limiting strips (24). The outer wall of the limiting strips (24) is slidably connected in the sliding groove of the inner wall of the fixed cylinder (25).

6. A ceramic micro-volume sampling needle according to claim 2, characterized in that: The surface of the indicator block (35) is provided with anti-slip texture, and the position of the indicator block (35) corresponds to the position of the arc-shaped magnetic strip (34).

7. A ceramic micro-volume sampling needle according to claim 2, characterized in that: The outer diameter of the magnetic ring (36) is adapted to the inner diameter of the injection cylinder (1), and the outer wall of the magnetic ring (36) is slidably connected to the inner wall of the injection cylinder (1).

8. A ceramic micro-volume sampling needle according to claim 3, characterized in that: The inner diameter of the limiting cylinder (43) is adapted to the outer diameter of the needle (6), and the outer wall of the needle (6) is slidably connected to the inner wall of the limiting cylinder (43).

9. A ceramic micro-volume sampling needle according to claim 3, characterized in that: The inner diameter of the top end of the conical tube (45) is the same as the inner diameter of the limiting tube (43), and the inner diameter of the bottom end of the conical tube (45) is smaller than its top end inner diameter.

10. A ceramic micro-volume sampling needle according to claim 1, characterized in that: The top end of the push rod (5) is fixedly connected to a pressing block, and the outer wall of the pressing block is provided with anti-slip protrusions.

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