Coaxial puncture needle suitable for ultrasonic real-time guidance

Abstract

The coaxial puncture needle comprises a needle core, a needle sheath and a limiter, the needle core is arranged in the needle sheath in a penetrating mode, the limiter is arranged on the needle sheath in a sleeving mode, the depth of the needle sheath puncturing into the skin is limited through the limiter, an adhesive tape is attached to the periphery of the limiter, and the adhesive tape is attached to the periphery of the limiter. The limiter is attached to the skin through the adhesive tape to prevent the needle sheath from being taken away from the skin, the head end of the needle core is sharp, the tail end of the needle core is provided with a needle core buckle, the tail end of the needle sheath is provided with a needle sheath buckle, the needle core is buckled on the needle sheath buckle through the needle core buckle and is connected with the needle sheath, the needle sheath buckle is provided with a lever, and the lever is connected with the needle sheath through the lever. The needle core buckle is bounced by pressing the lever, so that the needle core is bounced out of the needle sheath. Compared with the prior art, the efficiency and safety of ultrasonic real-time guided needle biopsy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of puncture biopsy and relates to a coaxial puncture needle suitable for real-time ultrasound guidance. Background Art

[0002] Ultrasound-guided real-time puncture biopsy plays an important role in clinical work. With the in-depth study of diseases, the development of various medical technologies, and the invention and optimization of various equipment, more and more types of diseases can be accurately diagnosed through core needle biopsy. Most epithelial malignant tumors can be diagnosed more accurately through 1-2 biopsy tissue strips, but most mesenchymal tumors and some rare diseases, such as lymphoma and soft tissue sarcoma, require more tissue strips for various immunohistochemical staining or genetic testing, which requires more punctures. Using a coaxial puncture needle to guide core needle biopsy can greatly reduce iatrogenic damage to patients, reduce the incidence of complications during puncture, and reduce the pain caused by the puncture process, which has great clinical value. The currently commonly used coaxial puncture needle is inconvenient to use under ultrasound guidance.

[0003] First, ultrasound-guided puncture requires a lot of experience in displaying the puncture needle. Beginners are not mature enough in displaying the needle tract and judging whether the puncture needle is completely within the ultrasound plane. Poor display of the needle tract or misjudgment of the needle tract position may trigger the puncture gun, causing surrounding normal organs or blood vessels to be damaged by the needle. Currently, many coaxial puncture needles lack designs for ultrasound imaging.

[0004] Secondly, ultrasound-guided core needle biopsy in real time requires the operator to hold the ultrasound probe in one hand and perform the puncture operation with the other hand. After the coaxial puncture needle is positioned, use the puncture gun to perform multiple puncture operations through the coaxial puncture needle. The stopper equipped with the currently commonly used coaxial puncture needle can only prevent the needle from being brought deeper into the skin during the insertion and firing of the puncture needle, but has no limit effect when the puncture needle is pulled out, causing the coaxial puncture needle to fall out of the target or even out of the human body after the puncture needle is pulled out, and the coaxial puncture needle needs to be re-placed.

[0005] Patent CN115300067A discloses a coaxial needle for puncture that is resistant to radioactive metal artifacts, including a puncture needle and a needle sheath. The puncture needle includes a needle rod made of engineering plastic for preventing radioactive metal artifacts, and a metal needle core embedded in the axis of the needle rod for puncture and imaging. The front end of the puncture needle is a conical needle tip, and the needle tip of the metal needle core extends out of the needle rod. The rear end of the puncture needle is provided with a gripping portion having a diameter greater than the needle rod, and an annular groove for fixing the needle sheath is provided at the shoulder between the gripping portion and the needle rod. The needle sheath is a tubular structure made of engineering plastic, and a metal strip for displaying the position is embedded in the front end side wall of the needle sheath. The needle sheath is clearance-matched with the needle rod of the puncture needle through the tube hole, and the rear end of the needle sheath is positioned in the annular groove of the puncture needle gripping portion, and the needle tip at the front end of the puncture needle extends out of the front end of the needle sheath. The front end of the needle sheath is conical and smoothly transitions to the conical needle tip of the puncture needle. However, this patent only uses a metal strip on the side wall of the front end of the needle sheath to locate the end of the needle sheath. This method can better indicate the end of the needle sheath during CT and MRI scans, but during real-time ultrasound scanning, the operator needs to perform more scanning operations to display the metal strip, and the plastic part of the needle sheath body is not significantly visualized under ultrasound, so this patent is not suitable for real-time ultrasound guidance.

[0006] Patent CN202146342U discloses a thoracentesis needle, which has the following structural features: the needle sheath and its branch tube are made of soft material, and the branch tube is used for extracting liquid and air or injecting drugs; the hollow needle core is made of metal material, and its needle seat end limiter and elastic air bag are used to fix the needle core and anesthesia; the tail end of the needle sheath includes a rubber valve and a length adjuster, and the length between the two bayonet mouths of the adjuster is equal to the length of the exposed part of the needle core; the rotatable soft thin sheet at the intersection of the needle sheath and the branch tube is used to hold the needle and fix the needle sheath; during puncture, the needle sheath and the needle core are combined into a sheath needle, and the elastic air bag is squeezed to absorb the anesthetic for local anesthesia and then the needle is inserted. After the needle head of the needle sheath enters the subcutaneous tissue, the length adjuster is adjusted to retract the needle core into the needle sheath and continue to hold the rotatable thin sheet to insert the needle. After entering the chest cavity, the needle core is pulled out and the thin sheet is rotated to fix it close to the skin. Although the patent is provided with a limiter, the position of the limiter cannot be flexibly adjusted, and the actual limiting effect is weak; the scheme of anesthetizing and puncturing the chest mentioned in the patent is not suitable for actual clinical operations, because the anesthetic needle is generally a 23-25G needle that infiltrates anesthesia layer by layer until the pleura at a slower speed in the manner of aspirating without blood return - injecting a small amount of anesthetic - inserting the needle to a deeper part and aspirating without blood return - injecting a small amount of anesthetic. The patent attempts to anesthetize at the same time as inserting a thicker chest puncture and drainage needle. This method has a very large medical safety hazard and is not convenient to operate; secondly, the patent attempts to use a blunt-headed soft needle sheath to rotate to break the parietal pleura to aspirate pleural effusion, which may cause iatrogenic trauma to the pleura. Soft straight tubes are generally used for injection and are not suitable for negative pressure aspiration.

[0007] Patent CN218606782U discloses a combined puncture needle for percutaneous hepatic puncture and bile duct drainage, including a hollow needle, a needle sheath and a needle cover; a hand-held visible transparent cannula is provided at the needle tail of the hollow needle; a cap is provided at the rear end of the hand-held visible transparent cannula; the needle sheath is cylindrical and has a curled portion, the needle sheath is inserted from one end of the needle cover, and the curled portion of the needle sheath entering the inner wall of the needle cover is straightened; the hollow needle is inserted into the needle sheath and passes through one end of the curled portion of the needle sheath, and the mounting end of the needle sheath is stuck on the connecting end of the hand-held visible transparent cannula of the hollow needle; the combination of the hollow needle and the needle sheath forms a puncture needle; the needle cover is used to straighten the needle sheath and prevent the puncture needle from piercing the skin before puncture. However, the patent does not make a design suitable for one-handed operation for the needle core push-out method. Although the patent uses a coating that increases ultrasound development at the end of the needle sheath to optimize ultrasound development, it does not optimize the ultrasound development of the needle body, and the patent does not design a limiter, which is not suitable for real-time ultrasound-guided puncture. Summary of the invention

[0008] The purpose of the present invention is to provide a coaxial puncture needle suitable for real-time ultrasound guidance in order to overcome at least one defect of the above-mentioned prior art. The present invention increases the efficiency and safety of real-time ultrasound-guided puncture biopsy.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] One of the technical solutions of the present invention is to provide a coaxial puncture needle suitable for real-time ultrasound guidance, the coaxial puncture needle comprising a needle core, a needle sheath and a limiter, the needle core is inserted into the needle sheath, the limiter is sleeved on the needle sheath, the depth of the needle sheath piercing into the skin is limited by the limiter, the outer periphery of the limiter is affixed with an adhesive tape, the limiter is attached to the skin by the adhesive tape, which plays a role in fixing the limiter to the skin and preventing the needle sheath from being removed from the skin, the head end of the needle core is sharp, and a needle core buckle is provided at the end, and a needle sheath buckle is provided at the end of the needle sheath, the needle core is connected to the needle sheath by buckling it on the needle sheath buckle, so that the needle core and the needle sheath are firmly fixed, and a lever is provided on the needle sheath buckle, and the needle core buckle is popped up by pressing the lever to make the needle core pop out of the needle sheath.

[0011] As a preferred technical solution, the head end of the needle core is in the form of a Chiba needle head and a triangular needle head.

[0012] Furthermore, the needle core buckle is provided with a buckle hook toward the head end of the needle core, and the bent hook of the buckle hook faces the main body of the needle core, and the needle sheath buckle is provided with a buckle convex ring toward the end direction of the needle sheath, and the protrusion of the buckle convex ring faces away from the main body of the needle sheath. When the needle core buckle is buckled on the needle sheath buckle, the buckle hook and the buckle convex ring fit together, so that the needle core buckle and the needle sheath buckle are firmly fixed.

[0013] Furthermore, a fulcrum is provided on the needle sheath buckle, and a rotating shaft is provided on the fulcrum. The lever rotates around the rotating shaft, and the lever is pressed down at one end toward the head end of the needle sheath and lifted up at one end toward the rear end of the needle sheath to lift up the buckle hook. The needle core will automatically withdraw a short distance, making it convenient to withdraw the needle core from the needle sheath.

[0014] Furthermore, the needle sheath buckle is provided with a protrusion toward the head end of the needle sheath, and after the end of the lever toward the head end of the needle sheath is pressed down and the buckle hook is lifted, the protrusion pops up when the lever is no longer pressed, pushing the end of the lever toward the head end of the needle sheath to lift up and the end facing away from the end end of the needle sheath to press back, restoring the lever to its initial position;

[0015] The protrusion is a bulging hollow piece, which facilitates the deformation of the protrusion when the lever is pressed, allowing the lever to be pressed down at one end toward the head end of the needle sheath.

[0016] Furthermore, the needle sheath is inlaid with ultrasonic enhancement developing rings, which are arranged at equal intervals to facilitate calculation of the approximate depth of the puncture needle tip.

[0017] Furthermore, the ultrasound enhanced developing ring includes a needle body developing ring and a needle tip developing ring, the needle body developing ring is arranged on the main body of the needle sheath, and the needle tip developing ring is arranged on the head end of the needle sheath, the width of the needle body developing ring is smaller than the needle tip developing ring, so that most of the needle sheath is displayed as a low echo band under ultrasound, the position of the needle body developing ring of the needle sheath main body is displayed as a narrow strong echo band, and the position of the needle tip developing ring at the head end of the needle sheath is displayed as a wide strong echo band, which is convenient for distinguishing the position and judging the position of the head end of the needle sheath.

[0018] Furthermore, the spacing between the ultrasonic enhanced developing rings is 1-1.5 cm, the width of the needle body developing ring is 0.5-1 mm, and the width of the needle tip developing ring is 2-2.5 mm.

[0019] Furthermore, the limiter is annular in shape and is provided with a seam, the two sides of which are closed by inserting edges to form a mortise and tenon structure, and after the handle is released, the material of the limiter itself tends to return to its original shape, so that the closed limiter is clamped and fixed on the needle sheath.

[0020] Furthermore, a handle is provided outwardly at the end of the inserted edge. When the seam is closed, the handles are staggered up and down, and the handles are pinched for squeezing. When the handles are closed, the limiter is opened, and the internal space of the limiter is expanded. The limiter can be moved on the needle sheath to adjust the position of the limiter. After releasing the hand, the limiter returns to its original shape and restores the fixing function.

[0021] Furthermore, the needle core is made of metal, the needle core buckle, needle sheath, and needle sheath buckle are all made of hard plastic, which is not easy to break during use, and the material of the limiter is selected from one of plastic and rubber.

[0022] As a preferred technical solution, the material of the needle core is selected from a metal selected from stainless steel, cobalt alloy, and titanium alloy; the materials of the needle core buckle, needle sheath, and needle sheath buckle are all selected from a hard plastic selected from polyethylene, polypropylene, and polycarbonate; the material of the limiter is selected from a plastic or rubber selected from polyethylene, polypropylene, polycarbonate, butyl rubber, fluororubber, and silicone rubber.

[0023] One of the technical solutions of the present invention is to provide a puncture method suitable for real-time ultrasound guidance, which uses the coaxial puncture needle to perform real-time ultrasound guided puncture biopsy, and the method comprises the following steps:

[0024] First move the stopper to the end of the needle sheath, make sure the needle core is fixed to the needle sheath by the buckle, and perform puncture under real-time ultrasound guidance. After the needle tip reaches the expected puncture position, adjust the position of the stopper so that the stopper contacts the skin, and stick the adhesive tape on the stopper to the skin for fixing. Press the lever on the needle sheath buckle to pop up the needle core buckle. After the needle core pops out, pull it out of the needle sheath. Then you can use the puncture needle to take biopsy samples through the coaxial puncture needle.

[0025] As a preferred technical solution, the protrusion assists in pressing the lever, and the lever returns to its original position after the needle core is ejected.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) Convenience of use. Due to the real-time ultrasound-guided puncture, the operator often needs to operate the puncture needle with one hand. The previous coaxial puncture needle has two ways of fixing the needle core and the needle sheath: rotating and tightening and snap-on fixing. If the rotating method is tightened, it is difficult to loosen it with one hand. If it is not tightened, the needle core will loosen due to the resistance of the forward movement during the puncture process. The existing snap-on method cannot realize the single-handed operation to withdraw the needle core. The snap-on method of the present invention ensures the firm fixation of the needle core and the needle sheath during the puncture process. By pressing the lever at the end of the needle sheath, it is also convenient for the operator to withdraw the needle core with minimal gesture adjustment, which can greatly increase the efficiency and safety of ultrasound-guided real-time core needle puncture biopsy.

[0028] (2) A more comprehensive stopper. The stopper of the previous coaxial puncture needle can prevent the coaxial puncture needle from being carried deeper into the puncture needle during the puncture process, thereby causing unsatisfactory puncture specimens, but it cannot prevent the coaxial puncture needle from falling out. If the coaxial puncture needle is not fixed by hand, the needle sheath is prone to accidental falling out when the puncture needle is pulled out. The stopper of the present invention adds an adhesive tape so that the stopper can be fixed to the skin, which is convenient for the operator to avoid accidental falling out of the needle sheath during one-handed operation. The stopper itself and the adhesive tape are used to improve the limit, so that the stopper has an adjustable position in both the in and out directions, which can greatly increase the efficiency and safety of ultrasound-guided real-time coarse needle puncture biopsy.

[0029] (3) Better ultrasound display. The sheaths of previous coaxial puncture needles were all made of metal materials. Some products were equipped with length indication marks and claimed that the presence of a sound wave scattering surface could produce better ultrasound display. However, since metal materials already appear as strong echoes under ultrasound, the scattering surface theoretically also forms a strong echo performance. In actual use, it cannot provide additional acoustic development. The sheath lacks a target point that can indicate the position of the sheath tip. At the same time, since the metal sheath is cylindrical, the metal sheath itself has a scattering effect on sound waves. Therefore, when the puncture needle and the ultrasound plane have a small angle deviation, the ultrasound can still display the metal sheath. The operator needs a lot of interventional experience to accurately judge whether the sheath plane and the ultrasound plane are completely overlapped. This determines whether the puncture needle tip is at the preset end point after the puncture gun is stimulated, which greatly determines the roughness. The safety and effectiveness of needle puncture; the present invention innovatively changes the material of the needle sheath, uses hard plastic as the main body, and is inlaid with a metal ring as an ultrasound enhancement development ring, which is conducive to ultrasound development and is evenly spaced. The operator can grasp the length of the needle sheath inserted into the human body through ultrasound image placement. The needle sheath displayed as a low echo under ultrasound is displayed as a strong echo band at the position of the ultrasound enhancement development ring. The wider strong echo band indicates the head end of the needle sheath, and the special development of the needle body and needle tip segments under ultrasound is increased, which is convenient for the operator to accurately judge the position of the head end of the needle sheath. When the strong echo band at the head end of the needle sheath and the last strong echo band of the needle sheath near the patient's skin can be displayed in one plane under ultrasound, it can be shown that the needle sheath completely overlaps with the ultrasound plane. In theory, the training cost of the operation can be shortened and the convenience and safety of coarse needle puncture biopsy can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the needle core in Example 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the needle sheath in Example 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the limiter after the handle is released in Example 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the limiter when the handle is closed in Example 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the connection between the stopper and the adhesive tape in Example 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the end of the needle core and needle sheath assembly in Example 1 of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the end of the needle core when it is withdrawn in Example 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the needle sheath in Example 2 of the present invention;

[0038] Fig. 9 It is a schematic diagram of the structure of the end of the needle core and needle sheath assembly in Example 2 of the present invention.

[0039] Description of the markings in the figure:

[0040] 1—needle core, 2—needle core buckle, 21—buckle hook, 3—needle sheath, 4—needle sheath buckle, 41—buckle convex ring, 42—fulcrum, 43—lever, 44—protrusion, 5—ultrasonic enhanced developing ring, 51—needle body developing ring, 52—needle tip developing ring, 6—limiter, 61—insertion edge, 62—handle, 7—adhesive tape. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1:

[0045] A coaxial puncture needle suitable for real-time ultrasound guidance, such as Figure 1 , Figure 2 and Figure 5 As shown, it includes a needle core 1, a needle sheath 3 and a stopper 6.

[0046] The needle core 1 is inserted into the needle sheath 3, and the limiter 6 is sleeved on the needle sheath 3 to limit the depth of the needle sheath 3 piercing into the skin.

[0047] The outer periphery of the stopper 6 is attached with an adhesive tape 7, and the stopper 6 is attached to the skin through the adhesive tape 7, which plays a role in fixing the stopper 6 and the skin, preventing the needle sheath 3 from being taken away from the skin.

[0048] The tip of the needle core 1 is sharp, and a needle core buckle 2 is provided at the end, and a needle sheath buckle 4 is provided at the end of the needle sheath 3. The needle core 1 is connected to the needle sheath 3 by buckling the needle core buckle 2 on the needle sheath buckle 4, so that the needle core 1 and the needle sheath 3 are firmly fixed.

[0049] The tip of the needle core 1 is selected from one of a Chiba needle and a triangular needle. In this embodiment, the Chiba needle is preferably used.

[0050] A lever 43 is provided on the needle sheath buckle 4, and the needle core buckle 2 is popped up by pressing the lever 43, so that the needle core 1 pops out of the needle sheath 3;

[0051] The needle sheath 3 is inlaid with ultrasonic enhancement developing rings 5, which are arranged at equal intervals to facilitate calculation of the approximate depth of the puncture needle tip;

[0052] The ultrasound enhancement developing ring 5 includes a needle body developing ring 51 and a needle tip developing ring 52. The needle body developing ring 51 is arranged on the main body of the needle sheath 3, and the needle tip developing ring 52 is arranged on the head end of the needle sheath 3. The width of the needle body developing ring 51 is smaller than the needle tip developing ring 52, so that most of the needle sheath 3 is displayed as a low echo band under ultrasound, the position of the needle body developing ring 51 on the main body of the needle sheath 3 is displayed as a narrow strong echo band, and the position of the needle tip developing ring 52 on the head end of the needle sheath 3 is displayed as a wide strong echo band, which is convenient for distinguishing the position and judging the position of the head end of the needle sheath 3;

[0053] The spacing of the ultrasonic enhancement developing rings 5 ​​is 1-1.5 cm, preferably 1 cm in this embodiment, the width of the needle body developing ring 51 is 0.5-1 mm, preferably 1 mm in this embodiment, and the width of the needle tip developing ring 52 is 2-2.5 mm, preferably 2 mm in this embodiment;

[0054] The material of the needle core 1 is selected from a metal selected from stainless steel, cobalt alloy, and titanium alloy, and is preferably medical stainless steel in this embodiment. The materials of the needle core buckle 2, the needle sheath 3, and the needle sheath buckle 4 are all selected from a hard plastic selected from polyethylene, polypropylene, and polycarbonate, and are preferably medical polyethylene in this embodiment, which is not easy to break during use. The material of the stopper 6 is selected from a plastic or rubber selected from polyethylene, polypropylene, polycarbonate, butyl rubber, fluororubber, and silicone rubber, and is preferably medical polyethylene in this embodiment;

[0055] like Figure 3 and Figure 4 As shown, the shape of the stopper 6 is circular, and a seam is opened on the stopper 6. The two sides of the seam are closed by inserting edges 61 to form a mortise and tenon structure. After the handle 62 is released, the material of the stopper 6 itself tends to return to the initial shape, so that the closed stopper 6 is clamped and fixed on the needle sheath 3;

[0056] A handle 62 is provided outwardly at the end of the insert edge 61. When the seam is closed, the handle 62 is staggered up and down. The handle 62 is pinched to squeeze. When the handle 62 is closed, the stopper 6 is opened, and the internal space of the stopper 6 is expanded. The stopper 6 can move on the needle sheath 3, so as to adjust the position of the stopper 6. After releasing the hand, the stopper 6 returns to the initial shape and resumes the fixing function.

[0057] like Figure 6 and Figure 7 As shown, the needle core buckle 2 is provided with a buckle hook 21 toward the head end of the needle core 1, the curved hook of the buckle hook 21 faces the main body of the needle core 1, and the needle sheath buckle 4 is provided with a buckle convex ring 41 in the direction away from the end of the needle sheath 3, the protrusion of the buckle convex ring 41 faces away from the main body of the needle sheath 3, and when the needle core buckle 2 is buckled on the needle sheath buckle 4, the buckle hook 21 fits with the buckle convex ring 41, so that the needle core buckle 2 and the needle sheath buckle 4 are firmly fixed;

[0058] A fulcrum 42 is provided on the needle sheath buckle 4, and a rotating shaft is provided on the fulcrum 42. The lever 43 rotates around the rotating shaft. The lever 43 is pressed down at one end toward the head end of the needle sheath 3, and the other end facing away from the tail end of the needle sheath 3 is lifted up to lift the buckle hook 21. The needle core 1 will automatically withdraw a short distance, making it convenient to withdraw the needle core 1 from the needle sheath 3.

[0059] A puncture method suitable for real-time ultrasound guidance, using the above coaxial puncture needle to perform real-time ultrasound guided puncture biopsy, the specific steps are as follows:

[0060] When the coaxial puncture needle is in use, first move the limiter 6 to the end of the needle sheath 3 to ensure that the needle core 1 is fixed to the needle sheath 3 by the buckle. Puncture is performed under real-time ultrasound guidance. After the needle tip reaches the expected puncture position, adjust the position of the limiter 6 so that the limiter 6 contacts the skin, and adhere the adhesive tape 7 on the limiter 6 to the skin for fixing. Press the lever 43 on the needle sheath buckle 4 with your finger to pop up the needle core buckle 2. After the needle core 1 is popped out, pull the needle core 1 out of the needle sheath 3. Then the puncture needle can be used to take biopsy samples through the coaxial puncture needle.

[0061] Embodiment 2:

[0062] A coaxial puncture needle suitable for real-time ultrasound guidance, such as Figure 8 and Fig. 9 As shown, it is basically the same as Example 1, except that the needle sheath buckle 4 is provided with a protrusion 44 toward the head end of the needle sheath 3, and after the end of the lever 43 toward the head end of the needle sheath 3 is pressed down and the buckle hook 21 is lifted, the protrusion 44 pops up when the lever 43 is no longer pressed, pushing the end of the lever 43 toward the head end of the needle sheath 3 to lift up and the end facing away from the end end of the needle sheath 3 to press back, so that the lever 43 is restored to the initial position;

[0063] The protrusion 44 is a circular bulging hollow member, so that the protrusion 44 can be deformed when the lever 43 is pressed, allowing the lever 43 to be pressed down toward one end of the head end of the needle sheath 3 .

[0064] A puncture method suitable for real-time ultrasound guidance, using the above-mentioned coaxial puncture needle to perform real-time ultrasound guided puncture biopsy, is basically the same as Example 1, except that the protrusion 44 assists in pressing the lever 43, and the lever 43 returns to its original position after the needle core 1 is ejected.

[0065] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A coaxial puncture needle suitable for real-time ultrasound guidance, characterized in that: The coaxial puncture needle comprises a needle core (1), a needle sheath (3) and a stopper (6), wherein the needle core (1) is inserted into the needle sheath (3), the stopper (6) is sleeved on the needle sheath (3), and the depth of the needle sheath (3) piercing into the skin is limited by the stopper (6), and an adhesive tape (7) is applied to the outer periphery of the stopper (6), and the stopper (6) is attached to the skin by the adhesive tape (7) to prevent the needle sheath (3) from being removed from the skin. The tip of the needle core (1) is sharp and is provided with a needle core buckle (2) at the end. The end of the needle sheath (3) is provided with a needle sheath buckle (4). The needle core (1) is connected to the needle sheath (3) by the needle core buckle (2) being buckled on the needle sheath buckle (4). The needle sheath buckle (4) is provided with a lever (43). By pressing the lever (43), the needle core buckle (2) is popped up, so that the needle core (1) pops out of the needle sheath (3).

2. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that: The needle core buckle (2) is provided with a buckle hook (21) in the direction of the head end of the needle core (1), and the curved hook of the buckle hook (21) faces the main body of the needle core (1). The needle sheath buckle (4) is provided with a buckle convex ring (41) in the direction of the end facing away from the needle sheath (3), and the protrusion of the buckle convex ring (41) faces away from the main body of the needle sheath (3). When the needle core buckle (2) is buckled onto the needle sheath buckle (4), the buckle hook (21) and the buckle convex ring (41) are in contact with each other.

3. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 2, characterized in that: The needle sheath buckle (4) is provided with a fulcrum (42), and a rotating shaft is provided on the fulcrum (42). The lever (43) rotates around the rotating shaft. The lever (43) is pressed down at one end in the direction of the head end of the needle sheath (3) and lifted up at one end in the direction of the rear end of the needle sheath (3), thereby lifting the buckle hook (21) and withdrawing the needle core (1).

4. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 2, characterized in that: The needle sheath buckle (4) is provided with a protrusion (44) in the direction toward the head end of the needle sheath (3); The protrusion (44) is a bulging hollow member.

5. The coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that: The needle sheath (3) is inlaid with ultrasonic enhancement developing rings (5), and the ultrasonic enhancement developing rings (5) are arranged at equal intervals.

6. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 5, characterized in that: The ultrasonic enhanced developing ring (5) comprises a needle body developing ring (51) and a needle tip developing ring (52); the needle body developing ring (51) is arranged on the main body of the needle sheath (3); the needle tip developing ring (52) is arranged on the head end of the needle sheath (3); and the width of the needle body developing ring (51) is smaller than that of the needle tip developing ring (52).

7. A coaxial puncture needle suitable for real-time ultrasound guidance according to claim 6, characterized in that: The spacing between the ultrasonic enhancement developing rings (5) is 1-1.5 cm, the width of the needle body developing ring (51) is 0.5-1 mm, and the width of the needle tip developing ring (52) is 2-2.5 mm.

8. The coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that: The stopper (6) is annular in shape, and a joint is provided on the stopper (6). The two sides of the joint are interlaced with each other through an inserting edge (61) to form a mortise and tenon structure for sealing.

9. The coaxial puncture needle suitable for real-time ultrasound guidance according to claim 8, characterized in that: A handle (62) is provided outwardly at the end of the insert edge (61), and when the seam is closed, the handle (62) is staggered up and down.

10. The coaxial puncture needle suitable for real-time ultrasound guidance according to claim 1, characterized in that: The needle core (1) is made of metal, the needle core buckle (2), the needle sheath (3) and the needle sheath buckle (4) are all made of hard plastic, and the material of the stopper (6) is selected from one of plastic and rubber.

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