Inner knife tube transmission structure and biopsy needle

Abstract

The utility model relates to the technical field of medical instruments, in particular to an inner knife tube transmission structure and a biopsy needle. The inner knife tube transmission structure comprises a fixing sleeve, an inner knife tube, an outer knife tube, an outer knife tube, an inner knife tube, an outer knife tube and an inner knife tube transmission mechanism, and is characterized in that the fixing sleeve drives the inner knife tube to synchronously act; the moving sleeve is used for driving the inner cutter tube to move in the axial direction, and the inner wall of the moving sleeve is inwards provided with a second protrusion in a protruding mode; the limiting piece is fixedly arranged on the outer wall of the inner knife tube, the limiting piece is arranged at at least one end of the fixing sleeve, and a limiting space is formed between the limiting piece and the first protrusion; the second protrusion is arranged in the limiting space, the limiting piece is arranged at one end, in the axial direction of the inner cutter tube, of the second protrusion in a blocking mode, and the first protrusion is arranged at the other end, in the axial direction of the inner cutter tube, of the second protrusion in a blocking mode. According to the scheme, when the movable sleeve drives the inner cutter tube to move in the axial direction, the movable sleeve and the fixed sleeve cannot be separated, and the problem of axial transmission failure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, in particular to a kind of inner cutter tube transmission structure and biopsy needle. BACKGROUND

[0002] Biopsy needle is a kind of medical instrument for sampling the living tissue of kidney, liver, lung, breast, thyroid, prostate, pancreas, testis, uterus, ovary, body surface and various organs.

[0003] For the biopsy needle of rotary cutting type disposable, the movement mode of the inner cutter tube of biopsy needle includes forward and backward movement and rotation, and the power is provided by the reusable biopsy handle. In order to transmit power to the inner cutter tube, the inner cutter tube is sleeved with a fixed sleeve fixedly connected thereto, and the power for forward and backward movement and the power for rotation are transmitted to the inner cutter tube through the fixed sleeve.

[0004] However, in the existing biopsy needle, the moving sleeve for transmitting the power of forward and backward movement to the fixed sleeve is buckled with the fixed sleeve through four elastic claws at the front end, which may cause the claws to disengage when the inner cutter tube moves backward along the axial direction, resulting in transmission failure of the axial movement of the fixed sleeve and abnormal operation of the biopsy needle. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide an inner cutter tube transmission structure and biopsy needle, which is used to solve the problem of axial transmission failure between the moving sleeve and the fixed sleeve when the inner cutter tube moves backward in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides an inner cutter tube transmission structure, comprising:

[0007] a fixed sleeve, which is sleeved on the inner cutter tube and drives the inner cutter tube to move synchronously, and the outer wall of the fixed sleeve is provided with a first protrusion outward;

[0008] a moving sleeve, which is used to drive the inner cutter tube to move synchronously along the axial direction of the moving sleeve, and the moving sleeve is sleeved on the fixed sleeve and can rotate relative to the fixed sleeve, and the inner wall of the moving sleeve is provided with a second protrusion inward;

[0009] a limiting member, which is fixedly arranged on the outer wall of the inner cutter tube, and is arranged at least one end of the fixed sleeve and forms an annular limiting space around the outer wall of the fixed sleeve with the first protrusion;

[0010] Wherein, the second protrusion is arranged in the annular limiting space, and the limiting member is arranged at one end of the second protrusion along the axial direction, and the first protrusion is arranged at the other end of the second protrusion along the axial direction.

[0011] Optionally, the limiting member is a limiting ring sleeved on the outer wall of the inner cutter tube.

[0012] Optionally, the limiting member comprises a ring body and limiting portions distributed along the circumference of the ring body, and the limiting portions extend outwardly along the radial direction of the ring body from the outer edge of the ring body.

[0013] Optionally, the limiting member abuts against the fixing sleeve along the axial direction, and a torque transmission structure is arranged between the limiting member and the fixing sleeve.

[0014] Optionally, the limiting member comprises a ring body and limiting portions distributed along the circumference of the ring body, and the limiting portions extend outwardly along the radial direction of the ring body from the outer edge of the ring body.

[0015] The fixing sleeve is provided with a receiving groove for embedding the ring body at one end provided with the limiting member, and the receiving groove comprises a central groove for embedding the ring body and a torque transmission groove for embedding the limiting member, the torque transmission groove extending from the inner wall of the central groove to the outer wall of the fixing sleeve, and the limiting portions extend from the torque transmission groove and block one end of the second protrusion along the axial direction.

[0016] Optionally, the second protrusion is an annular boss arranged along the inner side wall of the moving sleeve in the circumferential direction, and the first protrusion is an annular boss arranged along the outer side wall of the fixing sleeve in the circumferential direction; or one of the first protrusion and the second protrusion is an annular boss, and the other of the first protrusion and the second protrusion is discontinuous in the circumferential direction; or both the first protrusion and the second protrusion are discontinuous in the circumferential direction.

[0017] Optionally, the first protrusion is provided with a first surface facing the second protrusion, and the second protrusion is provided with a second surface facing the first surface, and the first surface and the second surface are both perpendicular to the axial direction.

[0018] Optionally, the limiting member is arranged at the front end of the fixing sleeve, the limiting member blocks the front end of the second protrusion, and the first protrusion blocks the rear end of the second protrusion.

[0019] Optionally, the inner cutter tube transmission structure further comprises a rear locking member fixed on the outer wall of the inner cutter tube, the rear locking member is arranged at the rear end of the fixing sleeve to position the fixing sleeve between the limiting member and the rear locking member, and at least one of the limiting member and the rear locking member is provided with a torque transmission structure between the fixing sleeve to fix the fixing sleeve on the inner cutter tube.

[0020] The utility model also provides a biopsy needle, including the inner cutter pipe transmission structure as described above.

[0021] As described above, in the inner cutter pipe transmission structure of the utility model, the outer wall of the fixed sleeve is outwardly convex with a first protrusion, the inner wall of the moving sleeve is inwardly protruding with a second protrusion, the limiting piece is fixedly arranged on the outer wall of the inner cutter pipe and arranged at least one end of the fixed sleeve, by arranging the second protrusion in the annular limiting space formed between the first protrusion and the limiting piece, the first protrusion and the limiting piece limit the second protrusion in the axial direction, which is conducive to ensuring that the moving sleeve and the fixed sleeve do not separate when the moving sleeve drives the inner cutter pipe to move in the axial direction, avoiding the problem of axial transmission failure, thereby avoiding the abnormal operation of the biopsy needle. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the moving sleeve structure schematic diagram of the utility model embodiment;

[0023] Figure 2 It is the fixed sleeve structure schematic diagram of the utility model embodiment;

[0024] Figure 3 It is the fixed sleeve and inner cutter pipe cooperation schematic diagram of the utility model embodiment;

[0025] Figure 4 It is the inner cutter pipe transmission structure and inner cutter pipe cooperation schematic diagram of the utility model embodiment;

[0026] Figure 5 It is the fixed sleeve perspective view of the utility model embodiment;

[0027] Figure 6 It is the limiting piece front view of the utility model embodiment;

[0028] Figure 7 It is the limiting piece perspective view of the utility model embodiment;

[0029] Figure 8 It is the biopsy needle part structure schematic diagram of the utility model embodiment.

[0030] Part number explanation

[0031] 1-moving sleeve; 11-second protrusion; 2-fixed sleeve; 21-first protrusion; 22-receiving groove; 221-center groove; 222-torque recess; 3-limiting piece; 31-ring body; 32-limiting part; 4-rear locking piece; 5-limiting space; 6-inner cutter pipe. DETAILED DESCRIPTION

[0032] The following embodiments of the present application will be described in detail by specific examples. Those skilled in the art can easily understand other advantages and functions of the present application from the content disclosed in the specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application.

[0033] It should be noted that the drawings provided in the embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components when actually implemented. The shape, number and proportion of each component when actually implemented can be arbitrarily changed, and the component layout pattern can also be more complex. The structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the functions and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear understanding of the description, not to limit the scope of the present application, and the change or adjustment of the relative relationship without substantially changing the technical content is also considered as the scope of the present application.

[0034] The biopsy needle comprises an outer tube and an inner tube 6, the front end of the outer tube is provided with a needle tip, and a sampling groove is arranged on the outer wall of the front end of the outer tube. The inner tube 6 is movably and rotatably arranged in the outer tube. During sampling, the tissue is sucked into the outer tube through the sampling groove under the action of negative pressure, and the inner tube 6 advances and rotates to cut the tissue. In the existing biopsy needle, the moving sleeve 1 for transmitting power to move the front and back to the fixed sleeve 2 is buckled with the fixed sleeve 2 through four elastic pull claws at the front end. The pull claw may be separated when the inner tube 6 moves backward along the axial direction. The inner tube transmission structure provided in the following embodiments is applied to the biopsy needle to solve the problem that the axial transmission between the moving sleeve 1 and the fixed sleeve 2 may fail when the inner tube 6 moves backward.

[0035] In the description of the following embodiments, the "axial direction" refers to the axial direction of the inner tube 6, and also the axial direction of the entire biopsy needle. In the description of the following embodiments, the orientation words "front" and "back" are relative directions, "front" refers to the direction close to the needle tip along the axial direction, and "back" refers to the direction away from the needle tip along the axial direction.

[0036] Please refer to Figures 1 to 4 ,Figure 8 The embodiment provides an inner cutter tube transmission structure, which comprises a fixed sleeve 2, a moving sleeve 1 and a limiting piece 3. The fixed sleeve 2 is sleeved on the inner cutter tube 6 and can drive the inner cutter tube 6 to move synchronously, that is, the fixed sleeve 2 is relatively fixed with the inner cutter tube 6. The outer wall of the fixed sleeve 2 is outwardly provided with a first protrusion 21. The moving sleeve 1 can drive the inner cutter tube to move synchronously along the axial direction. Specifically, the moving sleeve 1 is sleeved on the fixed sleeve 2, the moving sleeve 1 drives the fixed sleeve 2 to move along the axial direction, thereby driving the inner cutter tube 6 to move along the axial direction, and the inner wall of the moving sleeve 1 is inwardly provided with a second protrusion 11. The limiting piece 3 is fixedly arranged on the outer wall of the inner cutter tube 6 by welding or the like, the limiting piece 3 is arranged at least one end of the fixed sleeve 2, that is, the limiting piece 3 can be arranged only at the front end of the fixed sleeve 2, the limiting piece 3 can also be arranged only at the rear end of the fixed sleeve 2, and of course, the limiting piece 3 can also be arranged at the front end and the rear end of the fixed sleeve 2. The limiting piece 3 and the first protrusion 21 form an annular limiting space 5 around the outer wall of the fixed sleeve 2. The second protrusion 11 is arranged in the limiting space 5, the limiting piece 3 is arranged at one end of the second protrusion 11 along the axial direction of the inner cutter tube 6, and the first protrusion 21 is arranged at the other end of the second protrusion 11 along the axial direction of the inner cutter tube 6. It should be noted that the way of realizing that the fixed sleeve 2 is sleeved on the inner cutter tube 6 and can drive the inner cutter tube 6 to move synchronously, that is, the relative fixation of the fixed sleeve 2 and the inner cutter tube 6 can be realized in many ways. For example, in one possible implementation, the fixed sleeve 2 is limited by the limiting piece 3 at one end of the inner cutter tube 6, and the other end can be limited by the limiting piece 3, and a torque transmission structure is arranged between the limiting piece 3 and the fixed sleeve 2, so that the fixed sleeve is arranged on the inner cutter tube 6 by the limiting piece 3; in another possible implementation, the fixed sleeve 2 can be fixed on the inner cutter tube 6 by welding. It is worth mentioning that for a biopsy needle, the inner cutter tube 6 not only needs to move along the axial direction during sampling, but also needs to rotate around its own axis. The fixed sleeve 2 can transmit axial movement and rotary movement to the inner cutter tube 6, that is, by transmitting power in the axial direction to the fixed sleeve 2, the inner cutter tube 6 can be driven to move along the axial direction, and by transmitting rotary power to the fixed sleeve 2, the inner cutter tube 6 can be driven to rotate along its own axis.

[0037] In the present application, since the second protrusion 11 is arranged in the annular limiting space 5 formed between the first protrusion 21 and the limiting member 3, when the fixed sleeve 2 drives the inner cutter tube 6 to rotate, the rotation torque cannot be transmitted to the second protrusion 11, and the arrangement of the second protrusion 11 does not affect the relative rotation of the moving sleeve 1 and the fixed sleeve 2. In order to make the rotation of the inner cutter tube smooth, it can be considered that the second protrusion and the annular limiting space are in clearance fit along the axial direction. When the moving sleeve 1 moves forward along the axial direction of the inner cutter tube 6, the second protrusion 11 abuts against one of the limiting member 3 and the first protrusion 21; when the moving sleeve 1 moves backward along the axial direction of the inner cutter tube 6, the second protrusion 11 abuts against the other one of the limiting member 3 and the first protrusion 21, so that the moving sleeve 1 can drive the inner cutter tube 6 to move along the axial direction. For easy understanding, see Figures 1 to 4 , the fixed sleeve 2 and the moving sleeve 1 are both cylindrical structures, Figures 1 to 4 , the fixed sleeve 2 and the moving sleeve 1 are both horizontally arranged, and the corresponding axial direction is the left-right direction in the figure. In use, when the inner cutter tube 6 advances, it moves to the left in the figure, and when it retreats, it moves to the right in the figure, that is, the front end and the rear end correspond to the left end and the right end in the figure.

[0038] In the present embodiment, the outer wall of the fixed sleeve 2 is outwardly protruding with the first protrusion 21, the inner wall of the moving sleeve 1 is inwardly protruding with the second protrusion 11, and the limiting member 3 is fixedly arranged on the outer wall of the inner cutter tube 6 and arranged at least one end of the fixed sleeve 2. By arranging the second protrusion 11 in the annular limiting space 5 formed between the first protrusion 21 and the limiting member 3, the first protrusion 21 and the limiting member 3 limit the second protrusion 11 in the axial direction, which is beneficial to ensure that the moving sleeve 1 does not separate from the fixed sleeve 2 when the moving sleeve 1 drives the inner cutter tube 6 to move in the axial direction, thereby avoiding the problem of axial transmission failure and avoiding the abnormal operation of the biopsy needle.

[0039] In one embodiment, as shown in Figure 3 and Figure 4 , the limiting member 3 is arranged at the front end of the fixed sleeve 2, the limiting member 3 blocks the front end of the second protrusion 11, and the first protrusion 21 blocks the rear end of the second protrusion 11. The first protrusion 21 is arranged on the outer wall of the front end of the fixed sleeve 2, and the second protrusion 11 is arranged on the inner wall of the front end of the moving sleeve 1. First, the limiting member 3 is sleeved on the outer wall of the fixed sleeve 2 from the front end of the fixed sleeve 2, so that the second protrusion 11 abuts against the first protrusion 21, and then the limiting member 3 is assembled to the outer wall of the inner cutter tube 6 and located at the front end of the fixed sleeve 2, and abuts against the front end face of the fixed sleeve 2 for fixation. The above structure facilitates the installation of the limiting member 3 between the front end and the fixed sleeve 2.

[0040] In one embodiment, as shown in Figure 3 and Figure 4As shown, the inner cutter tube transmission structure further comprises a rear locking piece 4 fixed to the outer wall of the inner cutter tube 6, the rear locking piece 4 is arranged at the rear end of the fixing sleeve 2 to position the fixing sleeve 2 between the limiting piece 3 and the rear locking piece 4, and at least one of the limiting piece 3 and the rear locking piece 4 is provided with a torque transmission structure with the fixing sleeve 2 to fix the fixing sleeve 2 on the inner cutter tube 6, so that the inner cutter tube 6 can act synchronously with the fixing sleeve 2. Among them, the rear locking piece 4 can be fixed on the outer wall of the inner cutter tube 6 by welding or other methods, and the limiting piece 3 can also be fixed on the outer wall of the inner cutter tube 6 by welding, so that the rear locking piece 4 limits the front end of the fixing sleeve 2, and the rear locking piece 4 limits the rear end of the fixing sleeve 2 to fix the fixing sleeve 2 and the inner cutter tube 6. By the limiting mode of the limiting piece 3 and the rear locking piece 4, the structure is simple, the limiting effect is good, and the axial movement transmission failure is less likely to occur when the fixing sleeve 2 and the inner cutter tube 6 move. The torque transmission structure can make the fixing sleeve 2 more stably drive the inner cutter tube 6 to rotate along its own axis, improve the stability of the torque transmission from the fixing sleeve 2 to the inner cutter tube 6, and thus avoid the rotation transmission failure. If the limiting piece 3 and the rear locking piece 4 are both provided with a torque transmission structure with the fixing sleeve 2, the stability of the torque transmission from the fixing sleeve 2 to the inner cutter tube 6 can be further improved.

[0041] In this application, the limiting piece 3 can have various possible implementations, which will be described below:

[0042] In one embodiment (not shown in the figure), the limiting piece 3 is a limiting ring that is sleeved on the outer wall of the inner cutter tube 6. With this structure, the inner wall of the limiting ring cooperates with the outer wall of the inner cutter tube 6, which is conducive to the stable installation of the limiting piece 3 on the outer wall of the inner cutter tube 6. In actual implementation, the limiting ring can be fixed on the outer wall of the inner cutter tube 6 by welding or other connection methods. In another embodiment, as shown in Figure 6 and Figure 7 As shown, the limiting piece 3 comprises a ring body 31 and a limiting portion 32, the limiting portion 32 is distributed along the circumference of the ring body 31, and the limiting portion 32 extends outwardly from the outer edge of the ring body 31 along the radial direction of the ring body 31, and the limiting portion 32 is at least partially blocked at one end of the second protrusion 11 in the axial direction of the inner cutter tube 6. The ring body 31 is sleeved on the outer wall of the inner cutter tube 6, and the outer wall of the ring body 31 extends outwardly in the radial direction to form the limiting portion 32. With this structure, not only is it conducive to the stable installation of the limiting piece 3 on the outer wall of the inner cutter tube 6, but also the limiting portion 32 can be embedded in the corresponding groove on the fixing sleeve 2 to realize the torque transmission between the inner cutter tube 6 and the fixing sleeve 2.

[0043] In one embodiment, as shown in Figures 5 to 7As shown, the limiting member 3 and the fixed sleeve 2 abut along the axial direction of the inner cutter tube 6, and a torque transmission structure is arranged between the limiting member 3 and the fixed sleeve 2. When the limiting member 3 is arranged at the front end of the fixed sleeve 2, the rear end surface of the limiting portion 32 along the axial direction of the inner cutter tube 6 abuts against the front end surface of the fixed sleeve 2; when the limiting member 3 is arranged at the rear end of the fixed sleeve 2, the front end surface of the limiting portion 32 along the axial direction of the inner cutter tube 6 abuts against the rear end surface of the fixed sleeve 2. The torque transmission structure can further improve the stability of the fixed sleeve 2 in transmitting torque to the inner cutter tube 6.

[0044] In one embodiment, as shown in Figure 6 and Figure 7 As shown, the limiting member 3 includes a ring body 31 and a limiting portion 32, the limiting portion 32 is distributed along the circumference of the ring body 31, and the limiting portion 32 extends outwardly along the radial direction of the ring body 31 from the outer edge of the ring body 31;

[0045] The fixed sleeve 2 is provided with a receiving groove 22 corresponding to one end of the limiting member 3 for embedding the ring body 31, the receiving groove 22 includes a central groove 221 for embedding the ring body 31 and a torque transmission groove 222 for embedding the limiting member 3, the torque transmission groove 222 extends from the inner wall of the central groove 221 to the outer wall of the fixed sleeve 2, the limiting portion 32 extends out of the torque transmission groove 222 and blocks one end of the second protrusion 11 along the axial direction of the inner cutter tube 6. With this structure, the limiting member 3 not only plays an axial limiting role on the fixed sleeve 2, but also realizes torque transmission through the limiting portion 32 and the torque transmission groove 222, so that the rotating power input by the fixed sleeve 2 can be transmitted to the inner cutter tube 6 through the limiting member 3, realizing the synchronous movement of the inner cutter tube 6 and the fixed sleeve 2. For ease of understanding, see Figures 1 to 6 When the limiting member 3 is arranged at the front end of the fixed sleeve 2, the front end of the fixed sleeve is provided with the receiving groove 22,

[0046] The central groove 221 is concentrically arranged with the front end surface of the fixed sleeve 2, and the ring body 31 is fitted in the central groove 221, the outer edge shape and size of the central groove 221 are the same as the outer ring shape and size of the ring body 31. The inner wall of the central groove 221 extends to form a torque transmission groove 222, the limiting portion 32 cooperates with the torque transmission groove 222, and each limiting portion 32 is arranged in each torque transmission groove 222. The limiting portion 32 extends outwardly along the radial direction out of the torque transmission groove 222, and the extended part abuts against the front end surface of the second protrusion 11.

[0047] In this application, the first protrusion 21 and the second protrusion 11 have multiple possible embodiments, which will be described as follows:

[0048] In one embodiment, as shown in Figure 5 The second protrusion 11 is an annular boss arranged along the inner side wall of the moving sleeve 1, and the first protrusion 21 is an annular boss arranged along the outer side wall of the fixed sleeve 2.

[0049] In another possible implementation, one of the first protrusion 21 and the second protrusion 11 is an annular boss, and the other of the first protrusion 21 and the second protrusion 11 is discontinuous in the circumferential direction.

[0050] In still another possible implementation, both the first protrusion 21 and the second protrusion 11 are discontinuous in the circumferential direction, as long as the annular limiting space formed between the first protrusion 21 and the limiting member 3 can reliably limit the second protrusion within the annular limiting space.

[0051] In one implementation, as shown in FIG. 2, the first protrusion 21 is provided with a first surface facing the second protrusion 11, and the second protrusion 11 is provided with a second surface facing the first surface. Both the first surface and the second surface are perpendicular to the axial direction of the inner cutter tube 6, and are not easy to disengage when abutting against each other, thereby ensuring normal operation of the biopsy needle. Of course, in the present embodiment, it is also possible that both the first surface and the second surface are inclined surfaces, curved surfaces, or other composite surfaces. Figure 4 In one implementation, as shown in FIG. 3, the surface opposite to the second protrusion 11 of the first protrusion 21 is an inclined surface, and the height gradually decreases in the direction away from the second protrusion 11. When assembling, the moving sleeve 1 can be assembled from the front end or the rear end of the fixed sleeve 2, and the inclined surface can make the moving sleeve 1 more convenient and easier to assemble from any direction.

[0052] Figures 2 to 4 In one implementation, as shown in FIG. 4, the surface opposite to the second protrusion 11 of the first protrusion 21 is an inclined surface, and the height gradually decreases in the direction away from the second protrusion 11. When assembling, the moving sleeve 1 can be assembled from the front end or the rear end of the fixed sleeve 2, and the inclined surface can make the moving sleeve 1 more convenient and easier to assemble from any direction.

[0053] The present embodiment also provides a biopsy needle, as shown in FIG. 5, Figure 8 Figure 8 Part of the structure of the biopsy needle is shown, and the biopsy needle comprises the inner cutter tube transmission structure as described above.

[0054] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application shall be covered by the claims of the present application.​​

Claims

1. An inner cutter tube transmission structure, characterized by, The inner cutter tube transmission structure comprises a fixed sleeve, a moving sleeve, and a limiting member. The outer wall of the fixed sleeve is outwardly provided with a first protrusion. The inner wall of the moving sleeve is inwardly provided with a second protrusion. The limiting member is fixedly arranged on the outer wall of the inner cutter tube. The second protrusion is arranged in the annular limiting space formed between the limiting member and the first protrusion.

2. The inner knife tube transmission structure according to claim 1, characterized in that, The limiting member is a limiting ring arranged on the outer wall of the inner cutter tube.

3. The inner knife tube driving structure according to claim 1, wherein The limiting member comprises a ring body and a limiting portion.

4. The inner knife tube driving structure according to claim 2, wherein The limiting portion is at least partially arranged at one end of the second protrusion along the axial direction.

5. The inner knife tube driving structure according to claim 4, characterized in that, The limiting member and the fixed sleeve are abutted along the axial direction. The limiting member and the fixed sleeve are provided with a torque transmission structure.

6. The inner knife tube driving structure according to claim 1, wherein The limiting member comprises a ring body and a limiting portion.

7. The inner knife tube transmission structure according to claim 6, wherein The fixed sleeve is provided with a receiving groove corresponding to the limiting member at one end.

8. The inner knife tube driving structure according to any one of claims 1 to 7, characterized in that, The receiving groove comprises a central groove for embedding the ring body and a torque transmission groove for embedding the limiting member.

9. The inner knife tube driving structure according to claim 8, wherein, The limiting portion extends from the torque transmission groove and is arranged at one end of the second protrusion along the axial direction.

10. A biopsy needle, characterized in that The second protrusion is an annular boss arranged along the inner wall of the moving sleeve. The first protrusion is an annular boss arranged along the outer wall of the fixed sleeve. The first protrusion is provided with a first surface facing the second protrusion. The second protrusion is provided with a second surface facing the first surface. The first surface and the second surface are perpendicular to the axial direction. The limiting member is arranged at the front end of the fixed sleeve. The limiting member is arranged at the front end of the second protrusion. The inner cutter tube transmission structure further comprises a rear locking member fixed on the outer wall of the inner cutter tube. The rear locking member is arranged at the rear end of the fixed sleeve. The limiting member and the rear locking member are arranged between the fixed sleeve. At least one of the limiting member and the rear locking member is provided with a torque transmission structure with the fixed sleeve. The inner cutter tube transmission structure comprises any one of claims 1 to 9. The inner cutter tube transmission structure comprises any one of claims 1 to 9.

Images