Ultrasonic-guided fine needle puncture device

Abstract

The utility model provides a fine needle puncture device under ultrasonic guidance, and belongs to the technical field of medical puncture. The device comprises a puncture fine needle and a hollow cylinder, wherein a pintle of the puncture fine needle is connected with a nipple at one end of the hollow cylinder; a rubber plug is arranged in the hollow cylinder, one end of the rubber plug is connected with one end of a shaft rod, a guide sleeve is arranged at the other end of the hollow cylinder and provided with a through center hole, and the other end of the shaft rod penetrates through the center hole. The shaft rod is slidably connected with the center hole. An elastic air bag is arranged on the outer wall of the empty cylinder, and the edge of the air bag is hermetically connected with the outer wall of the empty cylinder to define an air bag cavity; an air inlet one-way valve communicated with the airbag cavity is arranged on the outer wall of the empty cylinder; an exhaust one-way valve is arranged on the wall of the airbag; a positive pressure cavity or a negative pressure cavity which can be switched for use is formed in the inner area, located between the rubber plug and the nipple, of the empty cylinder. According to the device, the operation process is remarkably simplified, the standardization and safety of thyroid needle biopsy are improved, and the device is particularly suitable for primary hospitals or single-person operation scenes.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical puncture, in particular to a fine needle puncture device under ultrasound guidance. Background Art

[0002] Ultrasound-guided fine needle aspiration biopsy is the most accurate and practical method for distinguishing benign and malignant thyroid nodules. At present, before puncture, the fine needle tip needs to be installed on the nipple end of the syringe; during puncture, the doctor holds the ultrasound probe in one hand and the syringe in the other hand to puncture the fine needle tip to the lesion site, then pulls the needle tip back and forth, and creates negative pressure in the needle tip by pumping the syringe to absorb the detached cells; then the fine needle is pulled out and separated from the syringe, and air is drawn into the syringe and then connected to the fine needle, and finally the aspirated material in the fine needle is discharged onto the glass slide with the help of the exhaust of the syringe barrel.

[0003] In actual operation, the existing method still has the following problems:

[0004] Firstly, a single person cannot complete the operation of drawing out the syringe, so a second person is needed to assist, which increases the labor cost and requires a high degree of tacit cooperation between the two parties.

[0005] Secondly, the above operation steps are complicated and require repeated disassembly and installation, which is troublesome.

[0006] Third, although fine needles cause less trauma, they are more easily clogged by tissue fragments. When using the exhaust of the syringe barrel to discharge the absorbed material in the fine needle onto the glass slide, if the needle is clogged, the connection between the needle plug and the nipple is prone to break due to friction, causing the needle to fall off, which is prone to contamination and safety problems. Utility Model Content

[0007] The purpose of the utility model is to solve at least one problem existing in the background technology, and for this purpose, an ultrasound-guided fine needle puncture device is proposed.

[0008] The technical solution is: an ultrasound-guided fine needle puncture device, comprising a puncture fine needle and an empty tube, wherein the needle plug of the puncture fine needle is connected to the nipple at one end of the empty tube; a rubber plug is arranged in the empty tube, one end of the rubber plug is connected to one end of the shaft, wherein:

[0009] A guide sleeve is provided at the other end of the hollow cylinder, the guide sleeve has a through center hole, the other end of the shaft rod passes through the center hole; the shaft rod is slidably connected to the center hole;

[0010] The outer wall of the hollow cylinder is provided with an elastic airbag, and the airbag has an airbag cavity;

[0011] The outer wall of the hollow cylinder is provided with an air intake check valve communicating with the airbag cavity, and the wall of the airbag is provided with an air exhaust check valve;

[0012] The hollow cylinder forms a positive pressure chamber or a negative pressure chamber that can be switched for use in the internal area between the rubber plug and the nipple.

[0013] Optionally, the guide sleeve and the empty cylinder are connected by plug-in or threaded connection.

[0014] Optionally, the end of the shaft away from the rubber plug is connected with a handle.

[0015] Optionally, it also includes an external locking sleeve mounted on the nipple, one end of the external locking sleeve is connected to the empty cylinder; the inner wall of the external locking sleeve has an internal thread; the end of the needle bolt has a boss; the needle bolt is mounted with an inner movable sleeve, the outer wall of the inner movable sleeve has an external thread, and the inner movable sleeve can be threadedly connected with the outer locking sleeve; one end of the inner movable sleeve has a clamping edge that is clamped with the boss.

[0016] Optionally, the length of the outer locking sleeve is smaller than the length of the nipple.

[0017] Optionally, the cross-sectional shape of the shaft is circular.

[0018] Optionally, the rubber plug is connected to the shaft rod by a snap-fitting manner, and one end of the rubber plug is fixedly connected to a plurality of claws; one end of the shaft rod is fixedly connected to a snap-fit ​​sleeve, and the interior of the snap-fit ​​sleeve has a snap-fitting cavity, and the snap-fitting cavity has a snap-fitting platform, and the snap-fitting claws can extend into the snap-fitting cavity and snap-fit ​​with the snap-fitting platform in the snap-fitting cavity.

[0019] Optionally, the claws are made of plastic.

[0020] Optionally, the handle and the shaft are connected in a detachable plug-in manner or a threaded connection manner.

[0021] Optionally, the length of the guide sleeve is ≥ 2 times the diameter of the shaft rod.

[0022] The above technical solution has the following advantages:

[0023] 1. In order to solve the problem of single-person operation, the utility model innovatively adopts the structural design of the airbag cavity (airbag + one-way valve) to replace the traditional suction action. When the airbag is pressed, the exhaust one-way valve is closed and the intake one-way valve is opened to form negative pressure suction. In this way, there is no need for an assistant to assist in drawing the syringe, which simplifies the operation and reduces labor costs.

[0024] 2. The utility model simplifies the clinical operation process. The traditional steps are: puncture → remove the needle → install the syringe for air exhaust → reinstall the needle → discharge the sample; while the steps of this design are: puncture → press the airbag for aspiration → press the shaft rod to discharge the sample. One device can achieve a dual-mode of negative pressure / positive pressure. The negative pressure mode is used for aspirating tissue samples, and the positive pressure mode is used for assisting in discharging the samples. In this way, there is no need for disassembly, and the operation steps can be significantly reduced.

[0025] 3. Although positive pressure is used to discharge the sample in this solution, if the needle is blocked, the positive pressure may cause excessive pressure at the connection and lead to the needle falling off. In this solution, the designed outer locking sleeve and inner movable sleeve are used in combination. Through the thread pre-tightening force, active axial constraint is provided, and the compressive capacity is stronger. The clamping structure further restricts the degree of freedom and reduces the probability of loosening; the overall use of the dual locking mechanism of thread pre-tightening + clamping significantly improves the compressive capacity at the connection, can effectively solve the problem of the connection bursting caused by needle blockage, and reduces the risk of the needle falling off.

[0026] 4. The utility model is modified from a common syringe. The cross-section of the shaft rod of the traditional syringe is cross-shaped. Such a special shape determines the inconvenience in processing related accessories and the problem of inconvenient assembly; therefore, by introducing a shaft rod with a circular cross-section and designing a claw and a clamping sleeve, the processing difficulty is reduced, the assembly is convenient, the installation and docking are smooth, and the rubber stopper and the shaft rod can be "inserted and combined" immediately; the designed guide sleeve in this solution can ensure the smooth sliding of the shaft rod. The design that the length of the guide sleeve is ≥ 2 times the diameter of the shaft rod can effectively prevent deflection and the guiding is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a three-dimensional view of the present utility model in Embodiment 1.

[0029] Figure 2 It is Figure 1 the exploded view of the structure of the present utility model.

[0030] Figure 3 It is Figure 1 the sectional view of the structure of the present utility model.

[0031] Figure 4 It is a three-dimensional view of the present utility model in Embodiment 2.

[0032] Figure 5 It is Figure 4Structural sectional view of the present utility model.

[0033] Figure 6 is Figure 5 Enlarged view of the structure of area A in the middle.

[0034] Figure 7 It is the sectional view of the present utility model in Embodiment 3.

[0035] Figure 8 is Figure 7 Schematic diagram of the split structure of the shaft rod and the rubber plug in clamping connection in the middle.

[0036] Figure 9 It is the three-dimensional view of the present utility model in Embodiment 3.

[0037] Wherein:

[0038] 1. Puncture fine needle; 101. Syringe hub; 1011. Boss; 102. Needle shaft; 103. Needle tip; 2. Barrel; 201. Nipple; 3. Guide sleeve; 4. Airbag; 5. Shaft rod; 6. Handle; 7. Exhaust check valve; 8. Intake check valve; 9. Rubber plug; 10. Outer locking sleeve; 11. Inner movable sleeve; 12. Clamping sleeve; 121. Clamping cavity; 13. Claw. Specific embodiments

[0039] Hereinafter, embodiments of the technical solution of the present utility model will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.

[0040] Embodiment 1:

[0041] As Figure 1 - Figure 3 shown, this embodiment proposes an ultrasonic-guided fine needle puncture device, including a puncture fine needle 1 and a barrel 2. Among them, the puncture fine needle 1 belongs to a conventional structure, which includes a syringe hub 101, a needle shaft 102 and a needle tip 103; the syringe hub 101 of the puncture fine needle 1 is connected to the nipple 201 at one end of the barrel 2; a rubber plug 9 is arranged in the barrel 2, and one end of the rubber plug 9 is connected to one end of the shaft rod 5. The barrel 2 in this embodiment is processed and modified from a clinically common syringe, with easily available materials and low cost.

[0042] In this embodiment, the empty cylinder 2 can have two structural forms. One is to retain the original syringe body structure, that is, the empty cylinder 2 has the original wing plate. The other is to cut the empty cylinder 2 and cut off the wing plate part at the tail end of the empty cylinder 2 to obtain a cylindrical tubular empty cylinder 2 structure. A guide sleeve 3 is provided at the other end of the empty cylinder 2. The guide sleeve 3 has a through central hole, and the other end of the shaft rod 5 passes through the central hole. The shaft rod 5 is slidably connected to the central hole. The guide sleeve 3 can play a good guiding role in the sliding of the shaft rod 5 and prevent deflection.

[0043] In this embodiment, an elastic airbag 4 is provided on the outer wall of the empty cylinder 2. The airbag 4 has an airbag cavity. The airbag 4 can be made of rubber, and the rubber is hermetically connected to the outer wall of the empty cylinder 2. The airbag 4 can also be directly a finished balloon made of the airbag 4. However, considering the two aspects of occupying space and convenient operation, the first method is selected in this embodiment. An intake one-way valve 8 communicating with the airbag cavity is provided on the outer wall of the empty cylinder 2. The intake one-way valve 8 is arranged to only allow gas to enter the airbag cavity unidirectionally from inside the empty cylinder 2. An exhaust one-way valve 7 is provided on the wall of the airbag 4. The exhaust one-way valve 7 is arranged to only allow the gas in the airbag cavity to be discharged outward unidirectionally. In this embodiment, the material of the airbag 4 can be made of silicone rubber.

[0044] In this embodiment, the negative pressure suction can be realized by using the airbag cavity setting, and the original rubber stopper 9 can ensure the positive pressure sample discharge. In this way, a device integrates the positive pressure / negative pressure dual mode.

[0045] The empty cylinder 2 forms a positive pressure chamber or a negative pressure chamber that can be switched and used in the internal area between the rubber stopper 9 and the nipple 201. During use, it can be selected according to the use requirements.

[0046] The utility model innovatively adopts the structural design of the airbag cavity (airbag 4 + one-way valve) to replace the traditional suction action. When pressing the airbag 4, the exhaust one-way valve 7 closes and the intake one-way valve 8 opens to form a negative pressure suction. In this way, there is no need for an assistant to assist in pumping the syringe, realizing single-person operation, simplifying the operation, and reducing the labor cost. At the same time, the diagnosis cycle can be shortened, effectively reducing the average operation time of thyroid nodule biopsy, and the daily reception volume can be increased several times. Grassroots hospitals do not need to configure full-time assistants, saving labor costs.

[0047] In this embodiment, the guide sleeve 3 and the empty cylinder 2 are connected by insertion or threaded connection; of course, fixed connection can also be adopted, such as adhesive fixation. When using insertion fixation, interference fit should be used to avoid displacement under high pressure. In this solution, as a preferred embodiment, the length of the guide sleeve 3 ≥ 2 times the diameter of the shaft rod 5.

[0048] In this embodiment, a handle 6 is connected to the end of the shaft rod 5 away from the rubber stopper 9. The handle 6 is provided for convenient pressing.

[0049] Technical effects:

[0050] The utility model simplifies the clinical operation process. The traditional steps are: puncture → disassemble the needle → install the syringe for air exhaust → reinstall the needle → discharge the sample; while the steps of this design are: puncture → press the airbag 4 for aspiration → press the shaft rod 5 to discharge the sample. One device can achieve a dual-mode of negative pressure / positive pressure. The negative pressure mode is used for aspirating tissue samples, and the positive pressure mode is used for assisting in discharging the samples. In this way, there is no need to disassemble again, which can significantly reduce the operation links and improve the efficiency.

[0051] Example 2:

[0052] As Figures 4 - 6 shown, on the basis of Example 1, an ultrasound-guided fine needle puncture device proposed in this example further includes an outer locking sleeve 10 sleeved on the nipple 201. One end of the outer locking sleeve 10 is connected to the barrel 2; the outer locking sleeve 10 can be circular or hexagonal; one end of the outer locking sleeve 10 is fixedly connected to the outer wall of the barrel 2; the inner wall of the outer locking sleeve 10 has internal threads.

[0053] The end of the syringe plunger 101 has a boss 1011, which is a conventional structure; an inner movable sleeve 11 is sleeved on the syringe plunger 101. The outer wall of the inner movable sleeve 11 has external threads, and the inner movable sleeve 11 can be threadedly connected with the outer locking sleeve 10 in a matching manner; one end of the inner movable sleeve 11 has a clamping edge portion that is adapted to be clamped with the boss 1011.

[0054] Although positive pressure is used to discharge the sample in this solution, if the needle is blocked, the positive pressure may cause excessive pressure at the connection and lead to the needle falling off. Therefore, in this solution, the designed outer locking sleeve 10 and inner movable sleeve 11 are used in combination. Through the threaded pre-tightening force, active axial restraint is provided, and the compressive capacity is stronger. The clamping structure further restricts the degree of freedom and reduces the probability of loosening; the overall uses a double locking mechanism of threaded pre-tightening + clamping, which significantly improves the compressive capacity of the connection, can effectively solve the problem of the connection coming apart caused by needle blockage, and reduces the risk of the needle falling off.

[0055] In this example, the length of the outer locking sleeve 10 is less than the length of the nipple 201. The purpose of this design is to facilitate the insertion of the syringe plunger 101 into the nipple 201 and is conducive to assembly.

[0056] Example 3:

[0057] As Figures 7 - 9 shown, on the basis of Example 1 or Example 2, in this example, the cross-sectional shape of the shaft rod 5 is circular or rectangular, preferably circular, and can be a hollow rod or a solid rod. The barrel 2 in this example is modified from a common syringe, and the cross-section of the shaft rod 5 of the traditional syringe is cross-shaped. Such a special shape determines the inconvenience of processing related accessories and the problem of inconvenient assembly. Based on this, further optimization and improvement are made:

[0058] The rubber plug 9 and the shaft rod 5 are connected by a snap-fitting manner, and one end of the rubber plug 9 is fixedly connected to a plurality of claws 13; one end of the shaft rod 5 is fixedly connected to a snap-fit ​​sleeve 12, and the interior of the snap-fit ​​sleeve 12 has a snap-fitting cavity 121, and the snap-fitting cavity 121 has a snap-fitting platform, and the claws 13 can extend into the snap-fitting cavity 121 and snap-fit ​​with the snap-fitting platform in the snap-fitting cavity 121.

[0059] The introduction of the shaft rod 5 with a circular cross section and the abandonment of the traditional cross-shaped plug shaft structure make it easier to process the guide sleeve 3; on the premise of replacing the shaft rod 5 with a circular shape, the design of the claw 13 and the clamping sleeve 12 can reduce the difficulty of processing, facilitate assembly, and achieve smooth installation and docking, so as to realize the "one-plug-and-fit" of the rubber plug 9 and the shaft rod 5. Otherwise, the connection and assembly problem between the shaft rod 5 and the rubber plug 9 also becomes a major problem. If the shaft rod 5 is not installed in place, problems such as skewness and instability may occur. The structural form of the guide sleeve 3, the claw 13, and the clamping sleeve 12 designed in this scheme is based on actual conditions. Such a design can ensure that the shaft rod 5 slides smoothly and that the installation and docking are smooth. The clamping design of the rubber plug 9 and the shaft rod 5 simplifies the assembly steps.

[0060] In this embodiment, the claw 13 is made of plastic material.

[0061] In this embodiment, the handle 6 and the shaft 5 are connected by a detachable plug-in connection or a threaded connection. In order to facilitate the plug-in connection between the guide sleeve 3 and the shaft 5, if the handle 6 is a fixed structure, it will cause assembly difficulties; while the design of a detachable method is conducive to overall assembly and effectively reduces the difficulty.

[0062] Production and assembly method:

[0063] ① Take a syringe, cut off the original stopper shaft of the syringe, and keep the rubber stopper 9;

[0064] ② Process and manufacture the guide sleeve 3, the shaft 5, the claw 13, the clamping sleeve 12, the outer locking sleeve 10 and the inner movable sleeve 11 and other components in advance;

[0065] ③ Fix the claw 13 to one side of the rubber plug 9; fix the clamping sleeve 12 to one end of the shaft 5, and pay attention to the axis alignment during installation; then “plug and connect” the shaft 5 and the rubber plug 9 to achieve docking;

[0066] ④ Insert the guide sleeve 3 onto the shaft 5, and then fix the handle 6 on one end of the shaft 5;

[0067] ⑤ Install the whole connected in the above steps with the empty cylinder 2, slide the rubber plug 9 into the empty cylinder 2 until the claws 13, the clamping sleeve 12 and other components enter the empty cylinder 2; then insert the guide sleeve 3 into the end of the empty cylinder 2 and fix it to complete the installation of the positive pressure system;

[0068] ⑥Install an intake one-way valve 8 on the empty cylinder 2. Select an airbag 4 of appropriate size with an exhaust one-way valve 7 and fix it at an appropriate position on the outer wall of the empty cylinder 2 to form an airbag cavity, thus completing the installation of the negative pressure system;

[0069] ⑦Fix and sleevethe outer locking sleeve 10 on the nipple 201; one end of the outer locking sleeve 10 is fixedly connected to the outer wall of the empty cylinder 2;

[0070] ⑧Sleeve the inner movable sleeve 11 on the syringe plunger 101 of the puncture fine needle 1, and then insert the syringe plunger 101 into the nipple 201; then screw the inner movable sleeve 11. The inner movable sleeve 11 is threadedly connected to the outer locking sleeve 10. As the inner movable sleeve 11 is screwed, the tightening fit of the inner movable sleeve 11 (external thread) and the outer locking sleeve 10 (internal thread) can generate an axial pre-tightening force, tightly pressing the boss 1011 of the syringe plunger 101 against the nipple 201 of the empty cylinder 2 to form a rigid connection, thus completing the overall assembly.

[0071] Usage method of this device:

[0072] I. Preoperative preparation

[0073] 1. Patient position

[0074] The patient lies in a supine position, with a soft pillow placed behind the neck and the head tilted backward to fully expose the thyroid area.

[0075] 2. Ultrasound positioning

[0076] The operator holds the ultrasound probe with the left hand to determine the position, size and blood flow signal of the target nodule, and marks the puncture point.

[0077] 3. Device assembly

[0078] Step 3-1. Component assembly. For the detailed steps, refer to the description in ①-⑦ above. In this step, it is default that the above components have been assembled in advance;

[0079] Step 3-2. Connect the puncture fine needle 1 to the empty cylinder 2: Insert the syringe plunger 101 end (with the boss 1011) of the puncture fine needle 1 into the nipple 201 of the empty cylinder 2, and rotate the inner movable sleeve 11 to lock the outer locking sleeve 10 (internal thread) and the inner movable sleeve 11 (external thread) to ensure that the clamping edge part is fully engaged with the boss 1011 (hear a "click" sound).

[0080] Step 3-3. Check the negative pressure system:

[0081] Press the airbag 4 several times to observe whether there is air flow out of the exhaust one-way valve 7, and confirm the normal use of the intake one-way valve 8.

[0082] II. Puncture and sampling

[0083] 4. Local anesthesia

[0084] Local infiltration anesthesia (1% lidocaine) was performed on the puncture site and the surrounding skin.

[0085] 5. Puncture and insertion

[0086] Needle holding and puncture: The operator holds the empty cylinder 2 with the right hand and inserts the needle tip 103 along the long axis of the ultrasound probe (in-plane insertion) and punctures the edge of the nodule under real-time ultrasound guidance.

[0087] 6. Negative pressure aspiration

[0088] Single-handed aspiration: Keep the needle tip 103 inside the lesion, press the airbag 4 with the right thumb to generate negative pressure, and at the same time gently insert and withdraw the needle tip 103 to make the cells fall off and be aspirated. Note: Observe the position of the needle tip 103 through ultrasound to avoid piercing out of the nodule or damaging blood vessels.

[0089] III. Sample discharge and processing

[0090] 7. Needle removal and hemostasis

[0091] Quickly remove the puncture needle and press the puncture site with a gauze for 5 minutes to observe for hematoma or bleeding.

[0092] 8. Positive pressure sample discharge

[0093] Push out the sample: Move the needle tip 103 above the glass slide, and push the shaft rod 5 (rubber stopper 9) with the right thumb towards the direction close to the nipple 201 to generate positive pressure. The positive pressure sprays the aspirated material in the needle stem 102 onto the glass slide. Note: When pushing the shaft rod 5 to move, press the airbag 4 with the other hand in advance so that the airbag 4 adheres to the outlet of the intake one-way valve 8 to block the intake one-way valve 8 and ensure that the air flow can only be discharged through the needle tip. Otherwise, it may disperse the positive pressure and is not conducive to the ejection of the sample.

[0094] IV. Postoperative treatment

[0095] 9. Sample fixation

[0096] Immediately immerse the glass slide in 95% ethanol or spray cell fixative and send it to the pathology department for staining and microscopic examination.

[0097] Through the above steps, this device will significantly simplify the operation process, improve the standardization and safety of thyroid puncture biopsy, and is especially suitable for the scenario of primary hospitals. This device can become an innovative tool for thyroid nodule biopsy, especially suitable for primary hospitals or single-operator scenarios, and can also be extended to the puncture applications of breast, lymph nodes and other parts.

[0098] It should be noted that many components mentioned in this utility model are common standard components or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0099] In this article, specific examples are used to elaborate on the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. An ultrasound-guided fine needle puncture device, comprising a puncture fine needle (1) and an empty tube (2), wherein a needle plug (101) of the puncture fine needle (1) is connected to a nipple (201) at one end of the empty tube (2); a rubber plug (9) is provided in the empty tube (2), one end of the rubber plug (9) is connected to one end of a shaft (5), and is characterized in that: The other end of the hollow cylinder (2) is provided with a guide sleeve (3), the guide sleeve (3) having a through center hole, and the other end of the shaft rod (5) passes through the center hole; the shaft rod (5) is slidably connected to the center hole; The outer wall of the hollow cylinder (2) is provided with an elastic airbag (4), and the airbag (4) has an airbag cavity; An air intake check valve (8) communicating with the airbag cavity is provided on the outer wall of the hollow cylinder (2), and an air exhaust check valve (7) is provided on the wall of the airbag (4); The hollow cylinder (2) forms a positive pressure chamber or a negative pressure chamber that can be switched for use in an internal area between the rubber plug (9) and the nipple (201).

2. The ultrasound-guided fine needle puncture device according to claim 1, characterized in that: The guide sleeve (3) and the empty cylinder (2) are connected by plugging or threading.

3. The ultrasound-guided fine needle puncture device according to claim 1, characterized in that: The end of the shaft rod (5) away from the rubber plug (9) is connected to a handle (6).

4. The ultrasound-guided fine needle puncture device according to claim 1, characterized in that: It also includes an outer locking sleeve (10) sleeved on the nipple (201), one end of the outer locking sleeve (10) being connected to the empty cylinder (2); the inner wall of the outer locking sleeve (10) having an internal thread; the end of the needle bolt (101) having a boss (1011); an inner movable sleeve (11) sleeved on the needle bolt (101), the outer wall of the inner movable sleeve (11) having an external thread, the inner movable sleeve (11) being able to be threadedly connected with the outer locking sleeve (10); one end of the inner movable sleeve (11) having a clamping edge portion that is clamped with the boss (1011).

5. The ultrasound-guided fine needle puncture device according to claim 4, characterized in that: The length of the outer locking sleeve (10) is smaller than the length of the nipple (201).

6. The ultrasound-guided fine needle puncture device according to claim 1, characterized in that: The cross-sectional shape of the shaft rod (5) is circular.

7. The ultrasound-guided fine needle puncture device according to claim 1 or 4, characterized in that: The rubber plug (9) and the shaft (5) are connected in a snap-fit ​​manner, one end of the rubber plug (9) being fixedly connected to a plurality of claws (13); one end of the shaft (5) being fixedly connected to a snap-fit ​​sleeve (12), the interior of the snap-fit ​​sleeve (12) comprising a snap-fit ​​cavity (121), the snap-fit ​​cavity (121) comprising a snap-fit ​​platform, the claws (13) being able to extend into the snap-fit ​​cavity (121) and being snap-fitted with the snap-fit ​​platform in the snap-fit ​​cavity (121).

8. The ultrasound-guided fine needle puncture device according to claim 7, characterized in that: The clamping claw (13) is made of plastic material.

9. The ultrasound-guided fine needle puncture device according to claim 3, characterized in that: The handle (6) and the shaft rod (5) are connected in a detachable plug-in manner or a threaded connection manner.

10. The ultrasound-guided fine needle puncture device according to claim 1, characterized in that: The length of the guide sleeve (3) is ≥ 2 times the diameter of the shaft rod (5).

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