Anti-displacement coaxial puncture needle

Abstract

The utility model discloses an anti-displacement coaxial puncture needle which comprises a puncture part and a positioning part, the puncture part used for puncture comprises a needle tube with a movable channel and a needle core movably inserted in the needle tube, the needle tube punctures at a target position, the positioning part used for fixing the needle tube is detachably arranged in the needle tube, and the needle core is movably inserted in the needle tube. A positioning piece in the positioning part can controllably adjust the unfolding angle through a positioning tube position adjusting assembly, the needle tube is fixed to the target position, and the needle tube is prevented from moving and falling off. The puncture needle has the advantages that the puncture part is used for completing puncture, the positioning part detachably arranged in the needle tube in the puncture part is used for fixing the position of the punctured needle tube, displacement of the punctured needle tube caused by breathing or other reasons is prevented, the positioning tube position adjusting assembly in the positioning part is used for adjusting and controlling the unfolding angle of the positioning piece in the positioning tube, and the puncture effect is improved. The clamping degree of the positioning piece and the surrounding tissue to be punctured is controlled, then the needle tube is controlled to be fixed, and the fixing universality is high when the needle tube is suitable for different conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of displacement prevention coaxial puncture needle. BACKGROUND

[0002] Primary lung cancer (PLC) ranks first in the world in terms of cancer incidence and mortality, with about 2.5 million new cases worldwide each year, and more than 1.6 million people die of lung cancer each year.

[0003] Current treatment methods for lung cancer mainly include surgical treatment, radiotherapy, drug treatment, ablation therapy and palliative treatment. Ablation therapy, as a minimally invasive treatment method, is one of the future directions of lung tumor treatment. In particular, percutaneous ablation technology under the guidance of influence has the characteristics of small trauma, clear efficacy, high safety, rapid recovery of patients and relatively simple operation in the treatment of lung tumors.

[0004] The prior art generally needs to use a coaxial puncture needle for puncture positioning when performing ablation therapy on lung tumors. After puncture, the coaxial puncture needle is replaced with an ablation needle for ablation therapy. However, the existing coaxial puncture needle is a metal needle structure and can only perform puncture function. Due to the physiological respiratory movement of the lung, the coaxial puncture needle is prone to relative displacement, causing tumor off-target, incomplete tumor ablation and damage to the surrounding normal tissue, increasing the risk of postoperative recurrence and complications.

[0005] Therefore, how to find a suitable coaxial puncture needle to solve the above problems of existing puncture needles has become the focus of many frontline researchers in the field.

[0006] In Chinese patent CN202020115260.4, entitled "Coaxial puncture needle", it is recorded that it includes a coaxial needle core, a coaxial needle tube, a needle base, a length adjustment knob and a threaded cap. The rear end of the coaxial needle tube is fixedly connected with the needle base. The coaxial needle core is arranged in the coaxial needle tube. The rear end of the coaxial needle core is fixedly connected with the threaded cap. The front end of the length adjustment knob is threadedly connected with the needle base. The rear end of the length adjustment knob is threadedly connected with the threaded cap.

[0007] As shown in the drawing of patent CN202020115260.4, the coaxial puncture needle in this patent is an existing puncture needle. This puncture needle only has puncture function and does not have the function of fixing the puncture needle after puncture. Due to the physiological respiratory movement of the lung, the coaxial puncture needle is prone to relative displacement, causing tumor off-target, incomplete tumor ablation and damage to the surrounding normal tissue, increasing the risk of postoperative recurrence and complications. UTILITY MODEL CONTENT

[0008] The technical problem solved by the utility model is that the prior art coaxial puncture needle does not have a positioning function after puncture, and the physiological respiratory movement of the lung after puncture can easily cause displacement or even falling of the coaxial puncture needle.

[0009] In view of the above technical problem, the utility model provides a kind of displacement prevention coaxial puncture needle;It is realized by the following technical scheme: a kind of displacement prevention coaxial puncture needle, including puncture part and positioning part, the puncture part for puncture includes needle tube with movable channel and needle core movably inserted in needle tube, the needle tube is punctured in target position, the positioning part for fixing needle tube is detachably arranged in needle tube, the positioning sheet in positioning part is controllable adjustment expansion angle by positioning tube position adjusting assembly, needle tube is fixed in target position, prevent needle tube from moving and falling.

[0010] The utility model discloses the technical scheme is preferably, and positioning part includes positioning tube, positioning tube installation assembly and positioning tube position adjusting assembly, positioning tube installation assembly is detachably arranged on needle tube, and positioning tube is installed in needle tube by positioning tube installation assembly, and positioning tube position adjusting assembly is set on positioning tube installation assembly and is connected with positioning tube, the position of positioning tube in needle tube is controllable adjustment by positioning tube position adjusting assembly, and then the expansion angle of positioning sheet on positioning tube is controlled, and the setting of positioning part is convenient for fixing the needle tube after puncture, prevents needle tube from moving due to the physiological respiratory movement of lung, causes the displacement of coaxial puncture needle, prevents tumor from off target, guarantees ablation effect, reduces the risk of postoperative recurrence and complication.

[0011] The utility model discloses the technical scheme is preferably, and positioning tube installation assembly includes installation head and guide groove, the installation head is detachably arranged on the end of needle tube, and guide groove is set on the inner side surface of installation head, and positioning tube controllably moves along guide groove by being inserted in installation head, and the setting of positioning tube installation assembly is convenient for installing positioning tube to needle tube, and it is convenient to fix the position of needle tube, and convenient to use.

[0012] The utility model discloses the technical scheme is preferably, and positioning tube position adjusting assembly includes adjusting nut, adjusting nut movably sets up in the installation head in positioning tube installation assembly, and the end of positioning tube is connected with adjusting nut, the depth of positioning tube in needle tube is controllable adjustment by adjusting nut, and the setting of positioning tube position adjusting assembly is convenient for adjusting the position of positioning tube, and it is convenient to adjust the expansion of positioning sheet for positioning, fixes the position of needle tube, and convenient to use.

[0013] The utility model discloses the technical scheme is preferably, and positioning tube includes position adjusting section, connecting section and positioning section, position adjusting section is connected with installation head by positioning tube position adjusting assembly, and positioning section is inserted in needle tube for the position of needle tube fixed, and positioning section is connected with position adjusting section by connecting section, and the setting of positioning section is convenient for being fixed with the tissue around needle tube after puncture, and then the position of needle tube is fixed.

[0014] In the preferred technical solution of the present invention, the positioning section includes a positioning piece and a connecting piece. The positioning piece is connected to the connecting section through the connecting piece. The positioning piece passes through the positioning hole on the needle tube and is exposed on the outside of the needle tube and is parallel to the outer side of the needle tube. Pulling the positioning tube can drive the positioning piece to bend at a certain angle to the needle tube, thereby fixing the position of the needle tube. The setting of the positioning piece facilitates fixation with the tissue around the needle tube after puncture, thereby fixing the position of the needle tube.

[0015] In a preferred embodiment of the technical solution of the present invention, the positioning piece is made of a material having toughness and the ability to be bent. This arrangement facilitates the deployment of the positioning piece, which is then stuck in the tissue around the puncture to fix the position of the needle tube.

[0016] In the preferred embodiment of the technical solution of the present invention, a puncture head is detachably provided at the end of the needle tube, and the puncture head is arranged on the needle tube through a rotary joint. The detachable setting of the puncture head facilitates the replacement of different modules to realize different functions, thereby improving the overall versatility of the device.

[0017] In the preferred embodiment of the technical solution of the present invention, a positioning anchor removal module is detachably provided on the needle tube, and the positioning anchor removal module includes a catheter and a storage tube. The catheter is detachably connected to the needle tube, and the storage tube is connected to the catheter through a pull rod. The positioning anchor used for positioning passes through the gap between the catheter and the storage tube and is contracted in the storage tube and is taken out of the body together with the needle tube. The setting of the positioning anchor removal module facilitates the removal of the positioning anchor for positioning set at the position to be ablated, and has diverse functions and strong versatility.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The technical solution of the utility model utilizes the puncture part to complete the puncture, and utilizes the positioning part detachably arranged in the needle tube in the puncture part to fix the position of the needle tube after puncture, thereby preventing the displacement of the needle tube after puncture due to breathing or other reasons. In addition, the positioning tube position adjustment component in the positioning part is utilized to adjust the expansion angle of the positioning piece in the positioning tube, control the degree of engagement between the positioning piece and the surrounding tissue of the puncture, and thus control the fixation of the needle tube. The utility model has strong versatility in fixation applicable to different situations.

[0020] The positioning anchor removal module that can be installed on the needle tube is used to remove the positioning anchor preset at the position to be ablated for positioning. It has diverse functions and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0022] Figure 2 This is an exploded view of the puncture part;

[0023] Figure 3 It is a three-dimensional schematic diagram of the positioning tube;

[0024] Figure 4 isometric view of the positioning tube installation assembly;

[0025] Figure 5 isometric view of the positioning tube position adjustment assembly;

[0026] Figure 6 is a partial sectional view of the positioning part;

[0027] Figure 7 is Figure 6 is an enlarged view at A in the middle;

[0028] Figure 8 is an isometric view of the fixing sheet when unfolded;

[0029] Figure 9 is an exploded view of the utility model;

[0030] Figure 10 is an isometric view of the positioning anchor extraction module of example 2;

[0031] Figure 11 is an exploded view of the positioning anchor extraction module of example 2;

[0032] Figure 12 is a partial sectional view of the positioning anchor after being retracted into the positioning anchor extraction module of example 2;

[0033] BRIEF DESCRIPTION OF DRAWINGS: 1-piercing part, 11-needle tube, 12-needle core, 13-piercing head, 14-handle, 15-positioning hole, 16-swivel joint, 2-positioning part, 3-positioning tube, 31-position adjustment section, 32-connection section, 33-positioning section, 34-guide block, 35-scale, 36-positioning sheet, 37-connection sheet, 4-positioning tube installation assembly, 41-installation head, 42-guide groove, 43-limiting ring, 5-positioning tube position adjustment assembly, 51-adjusting nut, 52-limiting groove, 6-positioning anchor, 7-positioning anchor extraction module, 71-conduit, 72-storage tube, 73-pull rod, 74-pull rod groove, 75-guide hole, 76-pull rope. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be described in detail below with reference to the accompanying drawings in the embodiments of the utility model. Figures 1-12 The technical solutions in the embodiments of the utility model will be described in detail below with reference to the accompanying drawings in the embodiments of the utility model. Example 1

[0035] As Figure 1 , 8As shown in Figure 9, an anti-displacement coaxial puncture needle includes a puncture part 1 and a positioning part 2, wherein the puncture part 1 for puncturing punctures at the target position, the positioning part 2 is installed in the needle tube 11 in the puncture part 1, and the position of the needle tube 11 at the puncture point is controllably fixed by the positioning part 2.

[0036] The puncture part 1 is a coaxial puncture needle, and its main function is to be used for puncture positioning.

[0037] The main function of the positioning part 2 is to fix the position of the needle tube 11 in the puncture part 1 after puncture, and the positioning part 2 can controllably adjust the fixation of the needle tube 11, that is, the positioning part 2 can limit the position of the needle tube 11 by clamping with the surrounding tissue at the puncture point, and can also release the clamping with the surrounding tissue at the puncture point to facilitate the removal of the needle tube 11.

[0038] like Figure 1 、 2 As shown in FIG9 , the puncture part 1 includes a needle tube 11 , a needle core 12 and a puncture head 13 , wherein the puncture head 13 is detachably mounted on the needle tube 11 , and the needle core 12 is movably inserted into the needle tube 11 .

[0039] The needle tube 11 is made of stainless steel that meets medical standards, preferably 304 stainless steel. The needle tube 11 is cylindrical as a whole. There is a channel inside the needle tube 11 for the needle core 12 and the positioning tube in the positioning part 2 to penetrate. The two ends of the needle tube 11 are open. In order to facilitate understanding and control of the puncture depth, a scale representing the puncture depth is set on the outer surface of the needle tube 11 by printing or etching.

[0040] In order to facilitate hand-held puncture, a handle 14 is fixed at one end of the needle tube 11. The handle 14 can be held for puncture. The handle 14 is preferably made of PP plastic. A circular through hole is opened inside the handle 14. One end of the needle tube 11 is inserted into the opening at the end of the handle 14 and fixedly connected to the handle 14.

[0041] In order to facilitate the installation of the positioning tube 3 in the positioning part 2, a circular hole is recessed perpendicular to the handle 14 at the end of the handle 14 away from the needle core 12. This circular hole is concentric with the needle tube 11 and has a thread on the inner wall of the circular hole.

[0042] In order to facilitate the deployment of the positioning piece 36 in the positioning part 2 and to fix the position of the needle tube 11, two rectangular holes are opened perpendicular to the side wall at the front end of the needle tube 11 and penetrate the needle tube 11. These rectangular holes are named positioning holes 15. The positioning piece 36 can be deployed through the positioning holes 15 and engage with the tissue around the puncture point.

[0043] In order to facilitate puncture, a section of internal thread is recessed at the port of the front end of the needle tube 11, the puncture head 13 is screwed on the needle tube 11 through the screw joint 16, the puncture head 13 is made of the same material as the needle tube 11, that is, stainless steel material, one end of the puncture head 13 is sharp and can pierce the skin for puncture, a screw joint 16 is fixed integrally with the puncture head 13 at the other end of the puncture head 13, the screw joint 16 is a circular tube, the inner diameter of the screw joint 16 is the same as the inner diameter of the needle tube 11, the outer diameter of the screw joint 16 is smaller than the outer diameter of the needle tube 11, and a thread is formed on the outer side wall of the screw joint 16, and the puncture head 13 can be screwed on the front end of the needle tube 11 through the screw joint 16.

[0044] Definition: In this embodiment, the end of the needle tube 11 close to the handle 14 is the rear end, and the end away from the handle 14 is the front end.

[0045] The needle core 12 is made of the same material as the needle tube 11, that is, stainless steel material, the outer diameter of the needle core 12 is smaller than the inner diameter of the needle tube 11, the function and structure of the needle core 12 are the same as those of the needle core in the existing coaxial puncture needle, and the needle core 12 can perform biopsy and push the existing positioning anchor 6 to the specified position, facilitating positioning of the operation.

[0046] As shown in Figs. Figure 3 , 4 , 5, 6, 7, 8 and 9, the positioning part 2 includes a positioning tube 3, a positioning tube mounting assembly 4 and a positioning tube position adjusting assembly 5, the positioning tube position adjusting assembly 5 is connected with the positioning tube mounting assembly 4, the positioning tube 3 is inserted into the needle tube 11 and connected with the needle tube 11 through the positioning tube mounting assembly 4, and the position and depth of the positioning tube 3 in the needle tube 11 are controllable and adjustable through the positioning tube position adjusting assembly 5.

[0047] The positioning tube position adjusting assembly 5 includes an adjusting nut 51, which is a circular nut with a thread inside, the adjusting nut 51 is arranged on the handle 14, the adjusting nut 51 is screwed with the positioning tube 3, and rotation of the adjusting nut 51 can adjust the depth of the positioning tube 3.

[0048] The positioning tube mounting assembly 4 includes a mounting head 41, which is a circular tube, the inner diameter of the mounting head 41 is the same as the inner diameter of the needle tube 11, and an external thread is formed on the outer wall of the mounting head 41, the mounting head 41 can be screwed on the handle 14 through the thread and matched with the thread at the end of the handle 14.

[0049] The installation head 41 is used to facilitate the installation of the adjusting nut 51 to the handle 14. In order to prevent the adjusting nut 51 from falling off, a limiting ring 43 is vertically protruded on one end of the installation head 41, the outer diameter of the limiting ring 43 is larger than the outer diameter of the installation head 41, and a ring-shaped boss is vertically protruded on the end face of one end of the adjusting nut 51, the inner diameter of the boss is larger than the inner diameter of the adjusting nut 51, and a limiting groove 52 is concave on the ring-shaped boss, which can cooperate with the limiting ring 43. The adjusting nut 51 is sleeved into the installation head 41 from the end of the installation head 41 away from the limiting ring 43, the limiting ring 43 and the limiting groove 52 cooperate, and after the installation head 41 is screwed to the handle 14, the adjusting nut 51 can rotate freely around the installation head 41 and will not fall off from the installation head 41.

[0050] Regarding the installation of the adjusting nut 51 and the installation head 41, during installation, first, the adjusting nut 51 is sleeved into the installation head 41 from the end of the installation head 41 away from the limiting ring 43, and then the installation head 41 is rotated to the handle 14.

[0051] In order to facilitate the adjustment of the depth of the positioning tube 3 in the needle tube 11, so that the positioning tube 3 moves linearly along the needle tube 11, a guide groove 42 with a rectangular cross section is concave on the inner side wall of the installation head 41, and a guide block 34 is also provided on the positioning tube 3. Through the cooperation of the guide block 34 and the guide groove 42, the positioning tube 3 can move linearly along the needle tube 11.

[0052] The positioning tube 3 is a circular tube made of 304 stainless steel, and the outer diameter of the positioning tube 3 is the same as the inner diameter of the needle tube 11. The positioning tube 3 is three-sectioned, including a position adjustment section 31, a connecting section 32, and a positioning section 33. The connecting section 32 is in the middle, connecting the position adjustment section 31 and the positioning section 33, and the position adjustment section 31 is located at the rear end of the needle tube 11, and the positioning section 33 is located at the front end of the needle tube 11.

[0053] In order to facilitate the adjustment of the position of the positioning tube 3, threads are provided on the outer surface of the front end of the position adjustment section 31. The position adjustment section 31 can cooperate with the adjusting nut 51 through the threads, and rotating the adjusting nut 51 can drive the position adjustment section 31 to move. In order to make the position adjustment section 31 move linearly along the needle tube 11, two rectangular guide blocks 34 are welded on the outer arc surface of the position adjustment section 31. The guide blocks 34 can cooperate with the guide groove 42 on the installation head 41 to realize the linear movement of the position adjustment section 31 in the needle tube 11, and further realize the linear movement of the positioning tube 3 along the needle tube 11.

[0054] In order to control the angle of the positioning sheet 36, a scale 35 is etched on the outer side of the position adjusting section 31, the scale 35 is arranged at intervals corresponding to the thread on the position adjusting section 31, the 0° scale is at one end of the thread, and the 90° scale is at the other end of the thread. When the positioning sheet 36 is not unfolded, the adjusting nut 51 corresponds to the 0° scale. When the adjusting nut 51 is rotated to move the positioning tube 3 outward to the maximum limit, the positioning sheet 36 is fully unfolded, and the adjusting nut 51 corresponds to the 90° scale. According to the correspondence between the adjusting nut 51 and the scale 35, the angle of the positioning sheet 36 can be determined.

[0055] The main function of the connecting section 32 is to connect the position adjusting section 31 and the positioning section 33.

[0056] The positioning section 33 is composed of two positioning sheets 36 and a connecting sheet 37. The connecting sheet 37 is an arc-shaped metal sheet made of the same material as the positioning tube 3. One end of the connecting sheet 37 is welded to the connecting section 32.

[0057] The positioning sheet 36 is an arc-shaped metal sheet. The size of the positioning sheet 36 is slightly smaller than that of the positioning hole 15 on the needle tube 11. The positioning sheet 36 can be made of a metal material that can be bent after heat treatment, such as a stainless steel spring that can be bent after heat treatment (this is a prior art and product, which can be directly used after simple heat treatment). One end of the positioning sheet 36 is welded to the end of the connecting sheet 37. After welding, the connecting sheet 37 and the positioning sheet 36 form a "U" shape. The positioning sheet 36 is clamped in the positioning hole 15 on the needle tube 11, and the end of the positioning sheet 36 away from the welding point is slightly raised above the outer wall of the needle tube 11. By pulling the positioning tube 3 outward, the positioning sheet 36 can be unfolded under the resistance of the side wall of the positioning hole 15 and clamped with the tissue around the puncture point, thereby limiting the position of the needle tube 11.

[0058] The fixing and releasing process of the positioning part 2 on the needle tube 11 in this embodiment is as follows: when the needle tube 11 needs to be fixed after puncturing the puncture point, the adjusting nut 51 is rotated forward. At this time, the positioning tube 3 moves outward, and the positioning sheet 36 is located in the positioning hole 15. As the positioning tube 3 gradually moves outward, the edge of the positioning hole 15 presses against the positioning sheet 36 to unfold it. When the welded end of the positioning sheet 36 is flush with the edge, the positioning sheet 36 is unfolded by 90°. At this time, the positioning sheet 36 can be clamped in the tissue around the puncture point to complete the limiting fixation.

[0059] When the fixation needs to be released, the adjusting nut 51 is first rotated in the opposite direction. At this time, the positioning tube 3 moves inward, and the unfolded end of the positioning sheet 36 gradually moves away from the edge of the positioning hole 15. Under the elastic force of the positioning sheet 36 itself, the positioning sheet 36 gradually returns to its original position, thereby releasing the fixation of the needle tube 11.

[0060] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention. Example 2

[0061] In order to facilitate the precise positioning of tiny or hard-to-reach lesions so that they can be found and removed quickly and accurately during surgery, a positioning needle is placed on the target before existing surgery to achieve precise positioning. This positioning needle is generally a hook-shaped positioning anchor 6, and it is more troublesome to remove the positioning anchor 6 during minimally invasive treatment.

[0062] On the basis of embodiment 1, a positioning anchor removal module 7 for removing the positioning anchor 6 is detachably mounted on the needle tube 11 .

[0063] like Figure 10 、 11 As shown in FIG12 , the positioning anchor removal module 7 includes a catheter 71 and a storage tube 72 . The catheter 71 is detachably mounted on the needle tube 11 , and the storage tube 72 is movably connected to the catheter 71 .

[0064] The catheter 71 is a cylindrical metal tube, which is made of 304 stainless steel. The inner diameter and outer diameter of the catheter 71 are the same as those of the needle tube 11. A rotary joint 16 is integrally provided at one end of the catheter 71. The catheter 71 is installed at the front end of the needle tube 11 through the rotary joint 16.

[0065] In order to facilitate the connection between the storage tube 72 and the catheter 71, two oppositely distributed rectangular grooves are recessed on the inner wall of the end of the catheter 71 away from the rotary joint 16. These grooves are named pull rod grooves 74, and the pull rod 73 in the storage tube 72 can be retracted into the pull rod groove 74.

[0066] The storage tube 72 is a cylindrical metal blind tube with one end open. It is made of 304 stainless steel as a whole. The inner diameter and outer diameter of the storage tube 72 are the same as those of the needle tube 11. In order to facilitate the connection between the storage tube 72 and the catheter 71, two rectangular pull rods 73 are welded opposite each other on the end face of the open end of the storage tube 72. The material of the pull rod 73 is the same as that of the storage tube 72, and the length of the pull rod 73 is slightly larger than the length of the positioning anchor 6. The pull rod 73 can be stuck in the pull rod groove 74.

[0067] In order to facilitate the storage of the pull rod 73 in the catheter 71, a rectangular through hole is opened on the surface of the pull rod 73 perpendicular to the pull rod 73 and passes through the pull rod 73. This rectangular through hole is named a guide hole 75. The pull rod 73 is connected to the catheter 71 through a fixing screw passing through the guide hole 75, so that the pull rod 73 can slide along the pull rod groove 74 along the fixing screw. When the pull rod 73 is completely stored in the pull rod groove 74, the port of the storage tube 72 is flush with the port of the catheter 71.

[0068] In order to facilitate the control of the pull rod 73 to be stored into the pull rod slot 74, a pull rope 76 is connected to the end of the pull rod 73, and pulling the pull rope 76 can drive the pull rod 73 to move along the pull rod slot 74.

[0069] The process of taking out the positioning anchor 6: before taking out, the puncture head 13 on the needle tube 11 is removed, the positioning anchor taking-out module 7 is screwed onto the needle tube 11, the positioning line on the positioning anchor 6 is passed through the gap between the storage tube 72 and the guide tube 71, and then the needle tube 11 with the positioning anchor taking-out module 7 is inserted into the puncture hole, then the needle core 12 is inserted into the needle tube 11, the positioning anchor 6 is pushed by the needle core 12, the positioning anchor 6 is pushed out of the tissue, then the positioning line on the positioning anchor 6 is pulled, the front end of the positioning anchor 6 enters the guide tube 71 first, because the length of the pull rod 73 is greater than the length of the positioning anchor 6, when the needle core 12 is continuously pushed, the positioning anchor 6 can be pushed into the storage tube 72 through the gap between the storage tube 72 and the guide tube 71, in this process, the storage tube 72 is in an open state under the action of the needle core 12, then the anchor claw of the positioning anchor 6 is elastically deformed by continuous force, the whole positioning anchor 6 is bundled in the storage tube 72, then the pull rope 76 is pulled to store the pull rod 73 into the pull rod slot 74, at this time, the port of the storage tube 72 is flush with the port of the guide tube 71, then the needle tube 11 can be pulled out, and the taking-out of the positioning anchor 6 is completed.

Claims

1. A displacement-resistant coaxial puncture needle, characterized by: The invention comprises a puncture part (1) and a positioning part (2), wherein the puncture part (1) comprises a needle tube (11) with a movable channel and a needle core (12) movably inserted into the needle tube (11), wherein the needle tube (11) punctures at a target position, and the positioning part (2) for fixing the needle tube (11) is detachably arranged in the needle tube (11), and the positioning piece (36) in the positioning part (2) can be controlled to adjust the expansion angle through the positioning tube position adjustment component (5), thereby fixing the needle tube (11) at the target position and preventing the needle tube (11) from moving and falling off.

2. The anti-displacement coaxial puncture needle according to claim 1, characterized in that: The positioning portion (2) comprises a positioning tube (3), a positioning tube mounting assembly (4) and a positioning tube position adjustment assembly (5); the positioning tube mounting assembly (4) is detachably mounted on the needle tube (11); the positioning tube (3) is mounted in the needle tube (11) via the positioning tube mounting assembly (4); the positioning tube position adjustment assembly (5) is mounted on the positioning tube mounting assembly (4) and connected to the positioning tube (3); the positioning tube position adjustment assembly (5) can controllably adjust the position of the positioning tube (3) in the needle tube (11), thereby controlling the deployment angle of the positioning piece (36) on the positioning tube (3).

3. The anti-displacement coaxial puncture needle according to claim 2, characterized in that: The positioning tube mounting assembly (4) comprises a mounting head (41) and a guide groove (42). The mounting head (41) is detachably mounted on the end of the needle tube (11). The guide groove (42) is disposed on the inner side of the mounting head (41). The positioning tube (3) inserted into the mounting head (41) can be controlled to move along the guide groove (42).

4. The anti-displacement coaxial puncture needle according to claim 2, characterized in that: The positioning tube position adjustment assembly (5) comprises an adjusting nut (51), which is movably arranged on a mounting head (41) in the positioning tube mounting assembly (4), and an end portion of the positioning tube (3) is connected to the adjusting nut (51). The depth of the positioning tube (3) in the needle tube (11) can be controlled and adjusted by the adjusting nut (51).

5. The anti-displacement coaxial puncture needle according to claim 2, characterized in that: The positioning tube (3) comprises a position adjustment section (31), a connecting section (32) and a positioning section (33). The position adjustment section (31) is connected to the mounting head (41) via a positioning tube position adjustment assembly (5). The positioning section (33) for fixing the position of the needle tube (11) is inserted into the needle tube (11). The positioning section (33) is connected to the position adjustment section (31) via the connecting section (32).

6. The anti-displacement coaxial puncture needle according to claim 5, characterized in that: The positioning section (33) includes a positioning piece (36) and a connecting piece (37). The positioning piece (36) is connected to the connecting section (32) via the connecting piece (37). The positioning piece (36) passes through the positioning hole (15) on the needle tube (11) and is exposed outside the needle tube (11) and is parallel to the outer side of the needle tube (11). Pulling the positioning tube (3) can drive the positioning piece (36) to bend at a certain angle to the needle tube (11), thereby fixing the position of the needle tube (11).

7. The anti-displacement coaxial puncture needle according to claim 6, characterized in that: The positioning piece (36) is made of a material having toughness and the ability to bend.

8. The anti-displacement coaxial puncture needle according to claim 1, characterized in that: A puncture head (13) is detachably provided at the end of the needle tube (11), and the puncture head (13) is arranged on the needle tube (11) via a rotary joint (16).

9. The anti-displacement coaxial puncture needle according to claim 1, characterized in that: A positioning anchor removal module (7) is detachably provided on the needle tube (11), and the positioning anchor removal module (7) comprises a catheter (71) and a storage tube (72). The catheter (71) is detachably connected to the needle tube (11), and the storage tube (72) is connected to the catheter (71) via a pull rod (73). The positioning anchor (6) used for positioning passes through the gap between the catheter (71) and the storage tube (72) and is gathered in the storage tube (72), and is taken out of the body together with the needle tube (11).

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