Biopsy needle

Abstract

The utility model relates to a biopsy needle. The biopsy needle comprises a shell, a cutting sleeve assembly, a rotating sleeve piece, a movable piece and a pushing piece. The shell is provided with a through hole and a cavity, the through hole is formed in the length direction of the shell, and the through hole penetrates through the cavity. The cutting sleeve assembly is arranged in the through hole in a penetrating mode, and the part, comprising the cutting edge end, of the cutting sleeve assembly penetrates out of the through hole. The rotating sleeve piece and the movable piece are both arranged in the cavity and both arranged on the outer side of the cutting sleeve assembly in a sleeving mode. The rotating sleeve piece can rotate along the axis of the rotating sleeve piece, and a guide through hole is formed in the rotating sleeve piece. And a matching section matched with the inner wall of the guide through hole is arranged on the outer wall of the movable part. The pushing part is provided with a pushing cavity in the movable part, the pushing part is arranged in the pushing cavity, the pushing part abuts against the cutting sleeve assembly, the rotating sleeve part rotates to drive the movable part to move, when the movable part moves, the pushing cavity can be driven to move, and the inner wall of the pushing cavity pushes the pushing part; and the cutting edge end of the cutting sleeve assembly is pushed to move by the pushing piece.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a biopsy needle. Background Technology

[0002] With the development and improvement of biopsy needle structure, current biopsy needles use a combination of a cutting cannula and a needle assembly to determine the sampling area to be cut. Due to the limitations of its structure, the initial relative position between the cutting cannula and the needle assembly cannot be precisely adjusted before sampling. Because of the diversity of the shape and size of lesions, the inability to adjust the sampling area can easily cause damage to other tissues. Utility Model Content

[0003] Therefore, it is necessary to provide a biopsy needle that addresses the issue of the inability to adjust the sampling range of the biopsy needle structure.

[0004] A biopsy needle, comprising:

[0005] The shell has a through hole along its length and a cavity, with the through hole penetrating the cavity;

[0006] The cutting sleeve assembly is partially inserted into the through hole, including the cutting blade tip that extends to the outside of the through hole;

[0007] The rotating kit is set inside the cavity and sleeved on the outside of the cutting sleeve assembly. It can rotate relative to its own axis and has a guide through hole opened inside along the length of the shell.

[0008] The movable part is set in the cavity and sleeved on the outside of the cutting sleeve assembly. The outer wall is provided with a section that matches the inner wall of the guide through hole. It can move along the length of the guide through hole and has a pushing cavity inside.

[0009] The pusher abuts against the cutting sleeve assembly and is partially disposed within the pusher cavity. The movement of the movable part can cause the inner wall of the pusher cavity to push the pusher, thereby moving the cutting edge.

[0010] In one embodiment, a needle assembly is further included that extends through the housing along the length of the cutting sleeve assembly; the needle assembly includes a guide needle tip extending to the outside of the cutting blade edge.

[0011] The needle assembly is fitted with a blade sheath, which has a blade edge.

[0012] A first sampling distance is set between the cutting edge of the blade sheath and the tip of the guide needle;

[0013] The cutting sleeve assembly is movably sleeved on the outside of the blade sleeve, and a second sampling distance is provided between the cutting blade tip and the guide needle tip;

[0014] The rotating assembly can drive the cutting edge to move along the blade sleeve toward the tip of the guide needle, thereby adjusting the second sampling distance to be less than the first sampling distance.

[0015] In one embodiment, the cavity includes a first space and a second space that are connected to each other; a movable member is disposed in the first space, and the inner wall of the cavity corresponding to the first space is used to limit the rotation of the movable member;

[0016] The rotating assembly is located in the second space, and the inner wall of the cavity corresponding to the second space is provided with a protruding limiting part, which is used to prevent the rotating assembly from rotating along the length direction of the shell.

[0017] In one embodiment, the movable part has a movable through hole at the end opposite to the rotating assembly, and the movable through hole connects to the pushing cavity; the cutting sleeve assembly part is inserted into the movable part and abuts against the surface of the pushing part opposite to the movable through hole; the maximum size of the surface of the pushing part facing the movable through hole is greater than the diameter of the movable through hole.

[0018] In one embodiment, a guide shaft is provided on the inner wall of the cavity, and the rotating assembly is sleeved on the guide shaft; the guide shaft contacts the inner wall of the guide through hole to guide the rotation of the rotating assembly.

[0019] In one embodiment, the inner width of the first space is smaller than the inner width of the second space, and the protruding limiting portion is formed at the connection between the inner wall corresponding to the first space and the inner wall corresponding to the second space.

[0020] In one embodiment, the guide hole is configured as a threaded hole, and the outer side of the mating section is provided with an external thread that mates with the threaded hole;

[0021] The internal thread of the threaded hole is set as a self-locking thread to prevent the moving part from moving away from the cutting edge.

[0022] In one embodiment, the pusher abuts against the end face of the cutting sleeve assembly, and the maximum length dimension of the pusher's cross-section perpendicular to the axial direction is smaller than the inner diameter of the push cavity.

[0023] In one embodiment, the housing is further provided with a drive cavity, a through hole is provided through the drive cavity, and a drive mechanism for driving the cutting sleeve assembly is provided in the drive cavity.

[0024] In one embodiment, a plurality of protruding limiting portions are provided on the inner wall of the second space.

[0025] The biopsy needle described above includes a housing, a cutting cannula assembly, a rotating assembly, a moving part, and a pushing part.

[0026] The aforementioned housing has a through hole extending along its length, thus penetrating the housing. A cavity is also formed within the housing, through which the through hole passes. A portion of the aforementioned cutting sleeve assembly passes through the through hole, while another portion extends outwards from the through hole to the outside of the housing. The portion extending outwards includes the cutting blade edge, which is one end of the cutting sleeve assembly. Both the aforementioned rotating assembly and movable component are housed within the cavity. The rotating assembly is fitted onto one section of the cutting sleeve assembly, and the movable component is fitted onto the other section of the cutting sleeve assembly. The rotating assembly can rotate along its own axis within the cavity but cannot move along the length of the housing. A guide hole is formed within the rotating assembly, extending along the length of the housing. A mating section is provided on the outer wall of the movable component, which engages with the inner wall of the guide hole. When the rotating assembly rotates, the structural engagement between the guide hole and the mating section drives the movable component to move along the length of the guide hole. A pushing cavity is formed inside the movable component, into which a portion of the cutting sleeve assembly passes. The pusher is disposed within the push cavity of the movable part, and the pusher abuts against the cutting sleeve assembly. When the movable part moves, the pusher can drive the push cavity to move, and at the same time, the inner wall of the push cavity will push the pusher, causing it to abut against the cutting sleeve assembly. The cutting blade end of the cutting sleeve assembly will be driven to move. The cutting sleeve assembly of this application has adjustable performance, and the position of the cutting sleeve assembly can be pre-adjusted before the biopsy needle performs cutting and sampling work, thereby adjusting the sampling range. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the biopsy needle in the embodiments of this application.

[0028] Figure 2 This is an axial cross-sectional view of the biopsy needle in the embodiments of this application.

[0029] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0030] Figure 4 for Figure 2 A magnified view of a section at point B in the middle.

[0031] Figure 5 This is a schematic diagram of the rotating kit in the embodiments of this application.

[0032] Figure 6 This is a partial assembly diagram of the biopsy needle after the shell has been removed in an embodiment of this application.

[0033] Figure 7 This is a schematic diagram of the structure of a portion of the shell in an embodiment of this application.

[0034] Figure 8This is a schematic diagram of the structure of the movable component in the embodiments of this application.

[0035] Figure 9 This is a schematic diagram of the moving parts in the embodiments of this application from another perspective.

[0036] Icon labels:

[0037] 1. Shell; 1.1. Cavity; 1.1.1. First space; 1.1.2. Second space; 1.2. Protruding limiting part; 1.3. Guide shaft;

[0038] 2. Cutting sleeve assembly; 2.1. Cutting blade tip

[0039] 3. Rotating assembly; 3.1. Guide through hole;

[0040] 4. Moving parts; 4.1. Mating section; 4.2. Pushing cavity; 4.3. Moving through hole;

[0041] 5. Pushing component; 6. Needle assembly; 6.1. Guide needle tip;

[0042] 7. Drive cavity; 8. Tool holder; 8.1. Tool holder cutting edge end. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] See Figures 1-4 As shown, Figure 1 This is a schematic diagram of the biopsy needle in the embodiments of this application. Figure 2 This is an axial cross-sectional view of the biopsy needle in the embodiments of this application. Figure 3 for Figure 2 Enlarged view of a section at point A in the middle. Figure 4 for Figure 2The enlarged view at point B shows a biopsy needle comprising: a housing 1, a cutting cannula assembly 2, a rotating assembly 3, a movable component 4, and a pushing component 5.

[0050] The aforementioned housing 1 has a through hole that extends along the length of the housing 1. A cavity 1.1 is also formed within the housing 1, through which the through hole passes. A portion of the aforementioned cutting sleeve assembly 2 is inserted into the through hole, while another portion extends outwards from the through hole to the outside of the housing 1. The portion extending outwards includes a cutting blade tip 2.1, which is one end of the cutting sleeve assembly 2.

[0051] Reference manual attached Figure 5 and attached Figure 6 , Figure 5 This is a schematic diagram of the rotating kit in the embodiments of this application. Figure 6 This is a partial assembly diagram of the biopsy needle after the shell has been removed, as shown in this embodiment. The rotating assembly 3 and the movable component 4 are both disposed within the cavity 1.1. The rotating assembly 3 is fitted onto the outer side of one section of the cutting sleeve assembly 2, and the movable component 4 is fitted onto the outer side of the other section of the cutting sleeve assembly 2. The rotating assembly 3 can rotate relative to its own axis within the cavity 1.1, but cannot move along the length of the shell 1. A guide hole 3.1 is provided within the rotating assembly 3, extending along the length of the shell 1. A mating section 4.1 is provided on the outer wall of the movable component 4, which mates with the inner wall of the guide hole 3.1. When the rotating assembly 3 rotates, the structural engagement between the guide hole 3.1 and the mating section 4.1 drives the movable component 4 to move along the length of the guide hole 3.1.

[0052] A pushing cavity 4.2 is provided inside the movable part 4, and a pushing member 5 is disposed within the pushing cavity 4.2 of the movable part 4. A portion of the cutting sleeve assembly 2 extends into the pushing cavity 4.2. The pushing member 5 and the portion of the cutting sleeve assembly 2 inserted into the pushing cavity 4.2 abut against the pushing member. When the movable part 4 moves, it can drive the pushing cavity 4.2 to move. Simultaneously, the inner wall of the pushing cavity 4.2 will push the pushing member 5, causing it to abut against the cutting sleeve assembly 2. The cutting sleeve assembly 2 and the cutting blade tip 2.1 will be moved. The rotating assembly 3 can be configured as a knob. The user of the biopsy needle can drive the knob to rotate clockwise or counterclockwise, thereby moving the movable part 4 along the axis of the housing 1, ultimately adjusting the position of the cutting blade tip 2.1. This structural design allows the cutting sleeve assembly 2 to have adjustable performance. Before the biopsy needle performs cutting and sampling, the position of the cutting sleeve assembly 2 can be pre-adjusted, thereby adjusting the sampling range.

[0053] The specific structure of the cutting cannula assembly 2 of the biopsy needle can be referenced from the existing technology. In this application, it is only necessary to ensure that the cutting cannula assembly 2 and other structures of the biopsy needle have a movable technical effect, which will not be elaborated further in this article.

[0054] In one embodiment of this application, the biopsy needle further includes a needle assembly 6. The needle assembly 6 passes through the housing 1 along the cutting sleeve assembly 2, and the needle assembly 6 includes a guide needle tip 6.1 extending to the outside of the cutting blade edge 2.1.

[0055] The biopsy needle also includes a sheath 8, which is fixedly sleeved on the needle assembly 6. The sheath 8 has a blade end 8.1, which is disposed on the needle assembly 6. The relative position between the blade end 8.1 and the tip 6.1 of the guide needle remains unchanged. The distance from the blade end 8.1 along the length of the housing 1 to the location of the tip 6.1 of the guide needle is set as the first sampling distance.

[0056] The cutting cannula assembly 2 is movably sleeved on the outside of the blade sheath 8, which is positioned between the cutting cannula assembly 2 and the needle assembly 6. The distance from the cutting blade edge 2.1 along the length of the housing 1 to the position of the guide needle tip 6.1 is set as the second sampling distance. The biopsy needle performs tissue sampling based on either the first or second sampling distance. The first sampling distance is always fixed. In this application, the rotating assembly 3 drives the movable part 4 to move, which in turn drives the pushing part 5 to move. The movement of the pushing part 5 pushes the cutting cannula assembly 2 to move synchronously, ultimately achieving the effect of adjusting the second sampling distance. When the first sampling distance is less than the second sampling distance, the blade sheath edge 8.1 is closer to the guide needle tip 6.1, and the first sampling distance is used as the cutting sampling distance of the biopsy needle. Conversely, when the second sampling distance is less than the first sampling distance, the cutting blade edge 2.1 is closer to the guide needle tip 6.1, and the second sampling distance is used as the cutting sampling distance of the biopsy needle. By adjusting the relative position of the cutting edge 2.1 and the sheath cutting edge 8.1, the cutting and sampling range can be switched. This biopsy needle adds the function of adjustable tissue sampling length, which can meet the diverse needs of clinical lesion tissue size and shape, enabling more accurate sampling and reducing the risk of bleeding caused by taking unwanted tissue.

[0057] The specific assembly method and transmission method between the needle assembly 6, the cutting sleeve assembly 2, and the housing 1 can be referred to the existing technology settings, and will not be elaborated in this article.

[0058] Reference manual attached Figure 7 , Figure 7This is a schematic diagram of the structure of a portion of the housing in one embodiment of this application. As shown, in one embodiment of this application, the cavity 1.1 includes a first space 1.1.1 and a second space 1.1.2 that are connected to each other. The movable member 4 is disposed in the first space 1.1.1. The inner wall of the cavity 1.1 corresponding to the first space 1.1.1 is used to restrict the shaking of the movable member 4, ensuring that the movable member 4 can move along the length direction of the guide hole 3.1, and that the movable member 4 does not rotate in the axial direction in the direction perpendicular to the length direction of the housing 1.

[0059] The aforementioned rotating assembly 3 is disposed within the second space 1.1.2. The inner wall of the cavity 1.1 corresponding to the second space 1.1.2 is provided with a protruding limiting part 1.2, which is used to prevent the rotating assembly 3 from moving along the length direction of the housing 1.

[0060] Predictably, multiple protruding limiting parts 1.2 are provided on the inner wall of the cavity 1.1 corresponding to the second space 1.1.2, and are positioned at different mating locations to prevent the rotating assembly 3 from moving along the axial direction of the housing 1. This prevents the rotating assembly 3 from approaching or moving away from the guide needle tip 6.1 and from rotating only circumferentially.

[0061] For the rotation of the rotating assembly 3 within the cavity 1.1, it is necessary to ensure that the user of the biopsy needle can easily rotate the rotating assembly 3. Normally, the rotating assembly 3 should be exposed on the outside of the housing 1 for user actuation. Alternatively, the cavity 1.1 can be configured as a complete internal cavity, with other driving structures on the outside of the cavity 1.1 to drive the rotating assembly 3 from outside the housing 1. The relevant configuration structures can be referenced from various transmission structures in the prior art, and will not be elaborated upon here.

[0062] Reference manual attached Figure 8 and attached Figure 9 , Figure 8 This is a schematic diagram of the structure of the moving parts in the embodiments of this application. Figure 9 This is a schematic diagram of the movable component in one embodiment of this application from another perspective. As shown in one embodiment, the movable component 4 has a movable through hole 4.3 at one end opposite to the rotating assembly 3. The movable through hole 4.3 connects to the pushing cavity 4.2, and the cutting sleeve assembly 2 partially penetrates into the pushing cavity 4.2. The cutting sleeve assembly 2 abuts against the surface of the pushing component 5 opposite to the movable through hole 4.3 inside the pushing cavity 4.2.

[0063] The maximum dimension of the surface of the aforementioned pusher 5 facing the movable through hole 4.3 is larger than the diameter of the movable through hole 4.3, ensuring that the pusher 5 can be pushed to move synchronously when the movable part 4 moves. In some embodiments, the cutting sleeve assembly 2 is coaxially arranged with the movable through hole 4.3 and placed in the push cavity 4.2.

[0064] In one embodiment of this application, a guide shaft 1.3 is provided on the inner wall of the cavity 1.1, and the rotating kit 3 is sleeved on the guide shaft 1.3; the guide shaft 1.3 contacts the inner wall of the guide through hole 3.1 to guide the rotation of the rotating kit 3, and the rotating kit 3 achieves rotation relative to its own axis.

[0065] Furthermore, a sliding limiting part is provided on the guide shaft 1.3. The sliding limiting part is used to contact the rotating kit 3 and prevent it from moving along the axis of the housing 1. The specific structure of the sliding limiting part can refer to the prior art, such as setting it as a flange and providing a corresponding annular groove on the inner wall of the rotating kit 3, etc. It is sufficient to achieve the limiting effect, and will not be elaborated further in this article.

[0066] It is foreseeable that the outer wall of the cutting sleeve assembly 2 can also achieve a rotational guiding effect on the rotating kit 3.

[0067] In one embodiment of this application, the through cavity is ensured to be opened along the axis of the housing 1, and the central axis of the housing 1 is collinear with the central axis of the cutting sleeve assembly 2, the central axis of the rotating kit 3, the central axis of the moving part 4 and the central axis of the pushing part 5, so that the structures can transmit to each other.

[0068] In one embodiment of this application, the inner width of the first space 1.1.1 is smaller than the inner width of the second space 1.1.2. Therefore, the protruding limiting part 1.2 is formed at the connection between the inner wall corresponding to the first space 1.1.1 and the inner wall corresponding to the second space 1.1.2. The slope formed by the protruding limiting part 1.2 can prevent the rotating assembly 3 from moving from the second space 1.1.2 to the first space 1.1.1.

[0069] In one embodiment of this application, the guide hole 3.1 is configured as a threaded hole, and the outer side of the mating section 4.1 is provided with an external thread that mates with the threaded hole; the internal thread of the threaded hole is configured as a self-locking thread to prevent the moving part 4 from moving away from the cutting edge end 2.1. The stepless adjustment of the cutting sleeve assembly 2 can be achieved through the threaded engagement between the guide hole 3.1 and the mating section 4.1, thereby adjusting the cutting sampling length.

[0070] In actual use, the pusher 5 and the movable part 4 are in their initial positions. First, by rotating the rotating assembly 3, the movable part 4 is moved towards the cutting edge 2.1. The movable part 4 pushes the pusher 5 and the cutting sleeve assembly 2 to move synchronously, thereby adjusting the cutting sampling distance between the cutting edge 2.1 and the guide needle tip 6.1. When the cutting sampling distance reaches the required target value, the rotating assembly 3 is no longer rotated. At this time, the self-locking thread of the threaded hole will ensure that the rotating assembly 3 will not move when subjected to axial force, maintaining the relative position of the cutting edge 2.1 and the guide needle tip 6.1. After the biopsy needle is no longer in use, the rotating assembly 3 is rotated in the opposite direction, causing the movable part 4 to gradually move away from the rotating assembly 3 along the axis of the housing 1. At this time, the pusher 5 is no longer limited by the movable block 4. The cutting sleeve assembly 2 can then be manually or with other power to push it back. When the cutting sleeve assembly 2 is pushed back, the pusher 5 can be pushed back to its initial position.

[0071] In one embodiment, the pusher 5 abuts against the end face of the portion of the cutting sleeve assembly 2 that penetrates into the push cavity 4.2, and the maximum length dimension of the cross section of the pusher 5 perpendicular to the axial direction of the through hole is less than the inner diameter of the push cavity 4.2.

[0072] In one embodiment, the housing 1 further includes a drive cavity 7, with a through hole penetrating the drive cavity 7. The drive cavity 7 houses a drive mechanism for driving the cutting cannula assembly 2. The drive cavity 7 and the housing 1.1 are independently configured. Before the biopsy needle cutting and sampling operation, the relative positions between the needle assembly 6 and the cutting cannula assembly 2 are adjusted. The drive cavity 7 is used to realize the cutting and sampling function of the cutting cannula assembly 2 and the needle assembly 6. The drive mechanism can also be configured as a drive cylinder.

[0073] The structural fit and specific usage of the aforementioned drive cavity 7, drive mechanism, needle assembly 6 and cutting sleeve assembly 2 can be referenced from existing technology settings, and will not be elaborated further in this article.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A biopsy needle, characterized in that, include: The shell (1) has a through hole along its length and a cavity (1.1) therethrough hole, which is provided through the cavity (1.1); The cutting sleeve assembly (2) is partially inserted into the through hole, including the cutting blade edge (2.1) extending to the outside of the through hole; The rotating kit (3) is located inside the cavity (1.1) and is sleeved on the outside of the cutting sleeve assembly (2). It can rotate relative to its own axis and has a guide through hole (3.1) inside along the length direction of the housing (1). The movable part (4) is disposed in the cavity (1.1) and sleeved on the outside of the cutting sleeve assembly (2). The outer wall is provided with a mating section (4.1) that matches the inner wall of the guide through hole (3.1). It can move along the length direction of the guide through hole (3.1) and has a pushing cavity (4.2) inside. The pusher (5) abuts against the cutting sleeve assembly (2) and is partially disposed in the push cavity (4.2). The movement of the movable part (4) can cause the inner wall of the push cavity (4.2) to push the pusher (5), thereby moving the cutting blade edge (2.1).

2. The biopsy needle according to claim 1, characterized in that, It also includes a needle assembly (6) that extends through the housing (1) along the length of the cutting sleeve assembly (2); the needle assembly (6) includes a guide needle tip (6.1) extending to the outside of the cutting blade edge (2.1); The needle assembly (6) is fitted with a blade sheath (8), and the blade sheath (8) has a blade edge end (8.1). A first sampling distance is provided between the cutting edge end (8.1) of the blade sheath and the tip (6.1) of the guide needle; The cutting sleeve assembly (2) is movably sleeved on the outside of the blade sleeve (8), and a second sampling distance is provided between the cutting blade tip (2.1) and the guide needle tip (6.1); The rotating assembly (3) can drive the cutting blade edge (2.1) to move along the blade sheath (8) toward the tip of the guide needle (6.1), thereby adjusting the second sampling distance to be less than the first sampling distance.

3. The biopsy needle according to claim 1, characterized in that, The cavity (1.1) includes a first space (1.1.1) and a second space (1.1.2) that are connected to each other; the movable component (4) is disposed in the first space (1.1.2). Within 1.1.1), the inner wall of the cavity (1.1) corresponding to the first space (1.1.1) is used to limit the rotation of the movable part (4); The rotating assembly (3) is disposed in the second space (1.1.2), and the inner wall of the cavity (1.1) corresponding to the second space (1.1.2) is provided with a protruding limiting part (1.2), which is used to prevent the rotating assembly (3) from moving along the length direction of the housing (1).

4. The biopsy needle according to claim 1, characterized in that, The movable part (4) has a movable through hole (4.3) at one end away from the rotating assembly (3), and the movable through hole (4.3) is connected to the pushing cavity (4.2); The cutting sleeve assembly (2) is partially inserted into the movable part (4) and abuts against the surface of the pusher (5) away from the movable through hole (4.3); the maximum size of the surface of the pusher (5) facing the movable through hole (4.3) is greater than the diameter of the movable through hole (4.3).

5. The biopsy needle according to claim 1, characterized in that, A guide shaft (1.3) is provided on the inner wall of the cavity (1.1), and the rotating kit (3) is sleeved on the guide shaft (1.3); the guide shaft (1.3) contacts the inner wall of the guide through hole (3.1) to guide the rotating kit (3) to rotate.

6. The biopsy needle according to claim 3, characterized in that, The inner width of the first space (1.1.1) is smaller than the inner width of the second space (1.1.2), and the protruding limiting part (1.2) is formed at the connection between the inner wall corresponding to the first space (1.1.1) and the inner wall corresponding to the second space (1.1.2).

7. The biopsy needle according to claim 1, characterized in that, The guide hole (3.1) is configured as a threaded hole, and the outer side of the mating section (4.1) is provided with an external thread that mates with the threaded hole; The internal thread of the threaded hole is configured as a self-locking thread to prevent the moving part (4) from moving in a direction away from the cutting edge end (2.1).

8. The biopsy needle according to claim 1, characterized in that, The pusher (5) abuts against the end face of the cutting sleeve assembly (2), and the maximum length dimension of the cross section of the pusher (5) perpendicular to the axial direction of the through hole is smaller than the inner diameter of the push cavity (4.2).

9. The biopsy needle according to claim 2, characterized in that, The housing (1) is further provided with a drive cavity (7), and the through hole is provided through the drive cavity (7). The drive cavity (7) is provided with a drive mechanism for driving the cutting sleeve assembly (2).

10. The biopsy needle according to claim 3, characterized in that, The protruding limiting part (1.2) is provided in multiple forms on the inner wall of the second space (1.1.2).

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