Biopsy needle

Abstract

The utility model relates to a biopsy needle which comprises a shell, a needle tube seat assembly and a rotary transmission mechanism, and the shell is provided with a containing cavity. The needle tube seat assembly is arranged in the accommodating cavity, the needle tube seat assembly can move and rotate relative to the shell, and the needle tube seat assembly is connected with the needle assembly and drives the needle assembly to complete cutting and sampling of target tissue; the rotary transmission mechanism is arranged in the containing cavity, the rotary transmission mechanism is in transmission connection with the needle tube seat assembly, and the rotary transmission mechanism can rotate relative to the shell so as to drive the needle tube seat assembly to rotate relative to the shell; and when the needle tube seat assembly completes percussion, the rotary transmission mechanism is unlocked by the needle tube seat. Thus, after the needle tube seat assembly completes percussion and achieves sampling of the needle assembly, the rotary transmission mechanism is unlocked through the needle tube seat assembly, when a doctor uses the biopsy needle, linear cutting sampling and rotary secondary cutting can be achieved only by percussion of the percussion function of the biopsy needle through one key, multiple times of unlocking operation are not needed, and the operation efficiency is improved. Therefore, the biopsy needle is simpler and more convenient to operate.

Description

Technical Field

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

[0002] In medical diagnosis, biopsies are frequently performed on cancer patients to obtain tissue samples from the lesion site for pathological study. A biopsy involves using a biopsy needle, guided by CT (computed tomography), ultrasound, or MRI imaging, to puncture and extract a small amount of tissue for testing. In recent years, biopsies have primarily been performed using biopsy needles due to their advantages of minimal trauma, less bleeding, and higher success rates, and have largely replaced traditional open surgical methods.

[0003] In puncture biopsy diagnosis, puncture equipment is needed to cut and separate human tissue for sampling and analysis. Current biopsy needles first fire to extract the sample, then rotate to supplement the cutting. This solves the problem of a large rotation radius at the needle tip caused by manual needle rotation, thus avoiding secondary damage to surrounding vital organs and the risk of enlarged puncture wounds, significantly improving safety and reducing patient pain. However, in existing technology, the activation buttons for firing and rotating the needle are located at different parts of the biopsy needle, requiring two separate steps, making the operation relatively complex. Utility Model Content

[0004] Therefore, it is necessary to provide a biopsy needle that addresses the technical problem of the two-step operation of the firing function and the rotary cutting function of the existing biopsy needle, which leads to a relatively complicated operation.

[0005] A biopsy needle, the biopsy needle comprising:

[0006] The shell has a receiving cavity;

[0007] A needle holder assembly is disposed within the receiving cavity. The needle holder assembly is movable and rotatable relative to the housing. The needle holder assembly is connected to the needle assembly and drives the needle assembly to complete the cutting and sampling of the target tissue.

[0008] A rotary transmission mechanism is disposed in the receiving cavity. The rotary transmission mechanism is connected to the needle seat assembly. The rotary transmission mechanism can rotate relative to the housing to drive the needle seat assembly to rotate relative to the housing.

[0009] When the needle seat assembly is fired, the rotary transmission mechanism is unlocked by the needle seat.

[0010] In one embodiment, a stop block is provided on the housing, and the rotary transmission mechanism includes a latch that abuts against the stop block to lock the rotational function of the rotary transmission mechanism; the biopsy needle further includes:

[0011] A push rod is movably connected to the housing. When the needle seat assembly is fired, the needle seat assembly abuts against the push rod and pushes the push rod to move relative to the housing. The push rod presses against the latch to disengage the latch from the stop block.

[0012] In one embodiment, the needle holder assembly includes:

[0013] An inner needle holder is disposed within the receiving cavity, and the inner needle holder is movable relative to the housing.

[0014] An outer needle holder is disposed within the receiving cavity. The outer needle holder is movable relative to the housing, and the outer needle holder and the inner needle holder are movable relative to each other.

[0015] In one embodiment, the push rod is provided with a stop protrusion, and the outer needle tube seat is provided with a push block, the push block abutting against the stop protrusion.

[0016] In one embodiment, the surface of the latch that abuts against the push rod is constructed as an inclined surface, and the dimension of the latch in the radial direction of the housing gradually increases from the direction closer to the push rod to the direction farther away from the push rod.

[0017] In one embodiment, the end of the push rod that abuts against the buckle is provided with an unlocking part, and the unlocking part protrudes from the push rod.

[0018] In one embodiment, the rotary transmission mechanism includes:

[0019] A rotating bracket is rotatably disposed relative to the housing and is drively connected to the needle holder assembly. The needle holder assembly is movable relative to the rotating bracket along the axial direction of the housing, and the rotating bracket drives the needle holder assembly to rotate relative to the housing.

[0020] The driving component is movable relative to the housing along the axial direction of the housing. The driving component is connected to the rotating bracket to drive the rotating bracket to rotate. The buckle is provided on the driving component.

[0021] In one embodiment, the rotary transmission mechanism further includes:

[0022] The bearing has an outer ring fixedly connected to the housing and an inner ring fixedly connected to the rotating bracket, the inner ring rotating relative to the outer ring.

[0023] In one embodiment, the driving component is sleeved on the rotating bracket; the rotary transmission mechanism further includes:

[0024] An elastic element is sleeved outside the rotating bracket and disposed between the bearing and the driving member. One end of the elastic element abuts against the outer ring of the bearing, and the other end abuts against the driving member. When the buckle abuts against the stop block, the elastic element is in a compressed state. The elastic element provides driving force for the driving member to move along the axial direction of the housing.

[0025] In one embodiment, a drive groove is provided on the peripheral side of the rotating bracket; a protrusion is provided on the drive member, and a portion of the protrusion is slidably disposed in the drive groove;

[0026] When the driving member moves relative to the housing along the axis of the housing, the protrusion slides along the trajectory of the driving groove, which can drive the rotating bracket to rotate around the axis of the housing.

[0027] The beneficial effects of this utility model are:

[0028] This invention provides a biopsy needle, with a housing for accommodating a needle holder assembly and other components. The needle holder assembly connects to the needle assembly and is configured to move and rotate relative to the housing. This allows the needle assembly to move and rotate relative to the housing, thereby enabling the cutting and sampling of the target tissue. A rotary transmission mechanism, rotatably connected to the housing, is connected to the needle holder assembly. This mechanism drives the needle holder assembly to rotate relative to the housing, which in turn drives the needle assembly to rotate. This rotational cutting action of the needle assembly further severs any uncut tissue from the initial linear cut, achieving complete separation of the target tissue sample from surrounding tissue. This reduces traction during retrieval of uncut tissue, minimizing unnecessary tissue damage. In this application, upon firing the needle holder assembly, the rotary transmission mechanism is unlocked, allowing its rotation to occur. With this setup, once the needle socket assembly fires and the needle assembly takes samples, the rotary transmission mechanism is unlocked via the needle socket assembly. When using the biopsy needle, the doctor only needs to fire the biopsy needle with one button to achieve linear cutting sampling and rotary secondary cutting, without the need for multiple unlocking operations, thus making the biopsy needle operation simpler and more convenient. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the internal structure of a biopsy needle provided in an embodiment of the present invention;

[0030] Figure 2 A three-dimensional structural diagram of a biopsy needle provided in an embodiment of the present invention, showing how the rotating transmission mechanism is unlocked through the outer needle tube seat;

[0031] Figure 3 A schematic diagram of the structure of a biopsy needle provided in an embodiment of the present invention, in which the rotary transmission mechanism is unlocked by a firing button;

[0032] Figure 4 A schematic diagram of the external outline of a biopsy needle provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the needle assembly of a biopsy needle provided in an embodiment of the present invention.

[0034] Figure label:

[0035] Housing 100; Stop block 110; Abutting protrusion 120; Bearing seat 130; Needle tube seat assembly 200; Inner needle tube seat 210; Outer needle tube seat 220; Push block 221; Needle assembly 300; Inner needle tube 310; Outer needle tube 320; Spring 321; Needle core 330; Rotary transmission mechanism 400; Rotary bracket 410; Drive slide 411; Insert key 412; Drive component 420; Buckle 421; Protrusion 422; Bearing 430; Elastic component 440; Push rod 500; Stop protrusion 510; Unlocking part 520; Rotary firing stroke block 530; First protrusion 540; Firing button 600; Snap-fit ​​protrusion 700; Firing spring 800. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model 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 utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0041] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0042] See Figures 1 to 5 This utility model provides a biopsy needle, which includes a housing 100, a needle seat assembly 200, and a rotary transmission mechanism 400. The housing 100 has a receiving cavity; the needle seat assembly 200 is disposed in the receiving cavity and is movable and rotatable relative to the housing 100. The needle seat assembly 200 is connected to a needle assembly 300 and drives the needle assembly 300 to complete the cutting and sampling of the target tissue; the rotary transmission mechanism 400 is disposed in the receiving cavity and is drively connected to the needle seat assembly 200. The rotary transmission mechanism 400 can rotate relative to the housing 100 to drive the needle seat assembly 200 to rotate relative to the housing 100; wherein, when the needle seat assembly 200 is fired, the rotary transmission mechanism 400 is unlocked by the needle seat.

[0043] This technical solution provides a biopsy needle. The housing 100 houses a needle holder assembly 200 and other components. The needle holder assembly 200 connects to the needle assembly 300. The needle holder assembly 200 is configured to move and rotate relative to the housing 100, thereby driving the needle assembly 300 to move and rotate relative to the housing 100, thus enabling the cutting and sampling of the target tissue. A rotary transmission mechanism 400, rotatably connected to the housing 100, is connected to the needle holder assembly 200. This mechanism drives the needle holder assembly 200 to rotate relative to the housing 100, which in turn drives the needle assembly 300 to rotate relative to the housing 100. This rotational cutting action of the needle assembly 300 further cuts any tissue not completely severed during the initial linear cut, achieving complete separation of the target tissue sample from surrounding tissue. This reduces traction during retrieval of unsevered tissue, minimizing unnecessary tissue damage. In this application, upon completion of firing of the needle holder assembly 200, the rotary transmission mechanism 400 is unlocked via the needle holder assembly 200, thereby enabling the rotation of the rotary transmission mechanism 400. With this configuration, after the needle holder assembly 200 has fired and the needle assembly 300 has taken samples, the rotary transmission mechanism 400 is unlocked via the needle holder assembly 200. When using the biopsy needle, the doctor only needs to fire the biopsy needle with a single button to achieve linear cutting sampling and rotary secondary cutting, eliminating the need for multiple unlocking operations, thus making biopsy needle operation simpler and more convenient.

[0044] Specifically, the needle assembly 300 includes an inner needle tube 310 and an outer needle tube 320, and the needle tube seat assembly 200 includes an inner needle tube seat 210 and an outer needle tube seat 220. The inner needle tube seat 210 is disposed in the receiving cavity and is movable relative to the housing 100. The inner needle tube seat 210 is fixedly connected to the inner needle tube 310. The outer needle tube seat 220 is disposed in the receiving cavity and is movable relative to the housing 100. The outer needle tube seat 220 is movable relative to the inner needle tube seat 210 and is fixedly connected to the outer needle tube 320.

[0045] like Figure 4 and Figure 5 As shown, the needle assembly 300 includes an inner needle tube 310, an outer needle tube 320, and a needle core 330. The needle core 330 is fixedly connected to the proximal end of the housing 100 and extends through the distal end of the housing 100. The inner needle tube 310 is fixedly connected to the inner needle tube seat 210, and the outer needle tube 320 is fixedly connected to the outer needle tube seat 220. The inner needle tube 310 is sleeved on the needle core 330, and the outer needle tube 320 is sleeved on the inner needle tube 310. The needle core 330, the inner needle tube 310, and the outer needle tube 320 are coaxially arranged. The distal end of the inner needle tube 310 has a cutting edge structure that can cut human tissue. A slot is provided on the side wall of the inner needle tube 310 that penetrates the side wall of the inner needle tube 310. The distal end of the outer needle tube 320 is provided with a spring piece 321. When the outer needle tube 320 moves relative to the inner needle tube 310 along the axis of the needle assembly 300, the spring piece 321 can pass through the slot on the inner needle tube 310 and enter the interior of the inner needle tube 310 to cut the tissue between the inner needle tube 310 and the needle core 330.

[0046] like Figures 1 to 2As shown, it is understandable that the biopsy needle needs to be loaded before it is inserted into the human body. After loading, the outer needle seat 220 and the inner needle seat 210 engage with the abutment protrusion 120 on the housing 100 via the locking protrusion 700. At this time, the firing spring 800 located between the outer needle seat 220 and the housing 100 is compressed to store energy. When the firing button of the biopsy needle is pressed, the locking protrusion 700 disengages from the abutment protrusion 120 on the housing 100. The compressed firing spring 800 then converts the potential energy stored in the previous compression into kinetic energy, pushing the outer needle seat 220 and the inner needle seat 210 to move along the axis of the housing 100 towards the distal end of the housing 100. The inner and outer needle seats 220 drive the inner and outer needle tubes 320 to move along the housing 100, thereby completing the initial cutting of the target tissue. During this process, the inner needle tube seat 210 first abuts against the retaining ring fixed inside the housing 100 and is stopped by the retaining ring; while the lock between the outer needle tube seat 220 and the inner needle tube seat 210 is unlocked by the retaining ring, and the outer needle tube seat 220 continues to move towards the distal end of the housing 100 under the elastic force of the firing spring 800. When or after the lock between the outer needle tube seat 220 and the inner needle tube seat 210 is unlocked, the outer needle tube seat 220 applies a force to the rotary transmission mechanism 400 to unlock the rotary transmission mechanism 400, thereby causing the rotary transmission mechanism 400 to drive the inner and outer needle tube seats 220 to rotate relative to the housing 100.

[0047] like Figure 2 As shown, specifically, a stop block 110 is provided on the housing 100, and the rotary transmission mechanism 400 includes a buckle 421, which abuts against the stop block 110 to lock the rotation function of the rotary transmission mechanism 400; the biopsy needle also includes a push rod 500, which is movably connected to the housing 100. When the needle tube assembly 200 is fired, the needle tube assembly 200 abuts against the push rod 500 and pushes the push rod 500 to move relative to the housing 100. The push rod 500 presses against the buckle 421 to disengage the buckle 421 from the stop block 110.

[0048] By providing a stop block 110 on the housing 100, the latch 421 on the rotary transmission mechanism 400 abuts against the stop block 110 on the housing 100, thereby locking the rotation function of the rotary transmission mechanism 400. By movably connecting the push rod 500 to the housing 100, the movement of the push rod 500 relative to the housing 100 presses against the latch 421, thereby disengaging the latch 421 from the stop block 110, thus unlocking the rotation function of the rotary transmission mechanism 400. In this embodiment, the movement of the push rod 500 relative to the housing 100 is achieved by the abutment between the needle tube seat assembly 200 and the push rod 500.

[0049] like Figure 2As shown, specifically, the push rod 500 is constructed as a square rod and is disposed inside the housing 100. A guide groove is provided on the housing 100 extending along the axial direction of the housing 100. The push rod 500 is guided and engaged with the guide groove so that the push rod 500 can only move along the axial direction of the housing 100.

[0050] like Figure 2 As shown, the push rod 500 is further provided with a stop protrusion 510, and the outer needle tube seat 220 is provided with a push block 221, which abuts against the stop protrusion 510. By providing the stop protrusion 510 on the push rod 500 and the push block 221 on the outer needle tube seat 220, the push block on the outer needle tube seat 220 abuts against the stop protrusion 510, thereby pushing the push rod 500 relative to the housing 100 to move by moving the outer needle tube seat 220 relative to the housing 100.

[0051] Specifically, on the peripheral side of the outer needle tube seat 220, at a position corresponding to the push rod 500, an annular protrusion protruding along the radial direction of the outer needle tube seat 220 is provided. This annular protrusion is the aforementioned push block 221. By providing the push block 221 on the outer needle tube seat 220, the outer needle tube seat 220 can reliably abut against the stop protrusion 510 on the push rod 500, thereby ensuring the reliability of the outer needle tube seat 220 in unlocking the rotary transmission mechanism 400.

[0052] like Figure 2 As shown, in one embodiment, the rotary transmission mechanism 400 includes a rotary support 410 and a drive member 420. The rotary support 410 is rotatably disposed relative to the housing 100 and is drively connected to the needle tube seat assembly 200. The needle tube seat assembly 200 is movable relative to the rotary support 410 along the axial direction of the housing 100, and the rotary support 410 drives the needle tube seat assembly 200 to rotate relative to the housing 100. The drive member 420 is movable relative to the housing 100 along the axial direction of the housing 100. The drive member 420 is drively connected to the rotary support 410 to drive the rotary support 410 to rotate. A buckle 421 is provided on the drive member 420.

[0053] Understandably, in order to achieve the transmission connection between the rotating bracket 410 and the inner and outer needle tube seats 220, in this embodiment, the rotating bracket 410 is constructed with two spaced-apart keys 412 at one end along its axis, and the keys 412 extend along the axial direction of the rotating bracket 410. The two keys 412 are respectively inserted into the slots on the outer needle tube seat 220 and the inner needle tube seat 210. The outer needle tube seat 220 and the inner needle tube seat 210 can move relative to the rotating bracket 410 along the axial direction of the rotating bracket 410, and the rotating bracket 410 can drive the outer needle tube seat 220 and the inner needle tube seat 210 to rotate relative to the housing 100. The inner needle tube seat 210 and the outer needle tube seat 220 can move relative to the keys 412, thereby enabling the inner needle tube seat 210 and the outer needle tube seat 220 to smoothly complete the loading and firing process, and also enabling the inner needle tube seat 210 and the outer needle tube seat 220 to rotate relative to the housing 100 under the drive of the rotating bracket 410. Specifically, the key 412 can be integrally molded onto the rotating bracket 410, or it can be glued onto the rotating bracket 410.

[0054] By configuring the drive member 420 to move relative to the housing 100 along the axial direction of the housing 100, and through the transmission connection between the rotating bracket 410 and the drive member 420, the rotating bracket 410 is driven to rotate relative to the housing 100. A latch 421 is mounted on the drive member 420. When the latch 421 abuts against the stop block 110 on the housing 100, the drive member 420 remains stationary relative to the housing 100, and the rotating bracket 410 also remains stationary relative to the housing 100. When the outer needle tube seat 220 strikes the push rod 500 and pushes the push rod 500 to move relative to the housing 100 to press against the latch 421, causing the latch 421 to disengage from the stop block 110, the drive member 420 can move relative to the housing 100, thereby driving the rotating bracket 410 to rotate relative to the housing 100.

[0055] like Figure 2 As shown, specifically, a drive groove 411 is provided on the peripheral side of the rotating bracket 410; a protrusion 422 is provided on the driving member 420, and a part of the protrusion 422 is slidably disposed in the drive groove 411; wherein, when the driving member 420 moves relative to the housing 100 along the axis of the housing 100, the protrusion 422 slides along the trajectory of the drive groove 411, which can drive the rotating bracket 410 to rotate around the axis of the housing 100.

[0056] By providing a drive groove 411 on the circumferential surface of the rotating bracket 410, the drive member 420 is configured to be movable relative to the housing 100 and to be connected to the rotating bracket 410 in a transmission manner, so that the protrusion 422 moves with the drive member 420. As the protrusion 422 slides along the trajectory of the drive groove 411 on the rotating bracket 410, the force of the protrusion 422 pushes the rotating bracket 410 to rotate relative to the housing 100, thereby causing the inner needle tube seat 210 and the outer needle tube seat 220 to rotate relative to the housing 100. Specifically, the drive member 420 is configured as a cylindrical structure, sleeved on the rotating bracket 410, and can move along the axis of the rotating bracket 410. The drive groove 411 can be a spiral groove, or a combination of a straight groove and a spiral groove, or a curved groove.

[0057] like Figure 2 As shown, in one embodiment, the rotary transmission mechanism 400 further includes a bearing 430. The outer ring of the bearing 430 is fixedly connected to the housing 100, and the inner ring of the bearing 430 is fixedly connected to the rotary support 410. The inner ring rotates relative to the outer ring. Specifically, the outer ring of the bearing 430 is fixedly connected to a bearing seat 130 fixed on the housing 100. By fixing the outer ring of the bearing 430 to the housing 100 and fixing the inner ring of the bearing 430 to the rotary support 410, relative rotation between the rotary support 410 and the housing 100 is achieved. In this embodiment, by rotatably connecting the rotary support 410 and the housing 100 through the bearing 430, the smoothness of rotation between the rotary support 410 and the housing 100 is improved.

[0058] Furthermore, the drive member 420 is sleeved on the rotating bracket 410; the rotary transmission mechanism 400 also includes an elastic member 440, which is sleeved outside the rotating bracket 410 and disposed between the bearing 430 and the drive member 420. One end of the elastic member 440 abuts against the outer ring of the bearing 430, and the other end abuts against the drive member 430. When the buckle 421 abuts against the stop block 110, the elastic member 440 is in a compressed state, and the elastic member 440 provides driving force for the drive member 420 to move circumferentially along the housing 100.

[0059] Specifically, the elastic element 440 can be a spring. By sleeved on the outside of the rotating bracket 410, and with both ends of the rotating bracket 410 abutting against the outer ring of the bearing 430 and the driving element 420 respectively, the elastic force of the elastic element 440 provides driving force for the movement of the driving element 420 relative to the housing 100, while ensuring that the elastic element 440 can only move along the axial direction of the housing 100, without being torn by the rotation of the rotating bracket 410. This allows each component in the rotary transmission mechanism 400 to perform its function without generating resistance between them, thus making the rotation function smoother.

[0060] like Figure 2 As shown, in one embodiment, to improve the reliability of the push rod 500 unlocking the latch 421 on the drive member 420, the surface of the latch 421 that abuts against the push rod 500 is constructed as an inclined surface. The dimension of the latch 421 in the radial direction of the housing 100 gradually increases from the direction closer to the push rod 500 to the direction farther away from the push rod 500. With this configuration, when the push rod 500 moves relative to the housing 100 under the pushing force of the outer needle tube seat 220, it is guided by the inclined surface on the latch 421, making it easier for the push rod 500 to press against the latch 421, so that the latch 421 disengages from the stop block 110 on the housing 100. This causes the drive member 420 to move along the circumferential direction of the housing 100 under the rebound force of the elastic member 440, thereby driving the rotating bracket 410 to rotate relative to the housing 100, and further driving the inner and outer needle tube seats 220 to rotate relative to the housing 100, so as to realize the rotation of the inner and outer needle tubes 320.

[0061] like Figure 2 As shown, in one embodiment, the end of the push rod 500 that abuts against the latch 421 is provided with an unlocking part 520, which protrudes from the rod body of the push rod 500. This arrangement makes the unlocking part 520 on the push rod 500 that abuts against the latch 421 larger, thereby increasing the contact area between the unlocking part 520 and the latch 421 and improving the reliability of the push rod 500 unlocking the latch 421.

[0062] like Figures 1 to 3 As shown, the specific loading and firing process of the biopsy needle provided in this embodiment of the present invention has been described in detail above and will not be repeated here. During the initial cutting of the target tissue by the biopsy needle, the inner needle tube seat 210 first abuts against the fixing ring fixed inside the housing 100 and is stopped by the fixing ring; while the lock between the outer needle tube seat 220 and the inner needle tube seat 210 is unlocked by the fixing ring, and the outer needle tube seat 220 continues to move toward the distal end of the housing 100 under the rebound force of the firing spring 800. As the outer needle tube seat 220 continues to move toward the far end of the housing 100, the push block 221 on the outer needle tube seat 220 abuts against the stop protrusion 510 on the push rod 500. The outer needle tube seat 220 continues to move relative to the housing 100, thereby driving the push rod 500 to move relative to the housing 100. During the movement, the unlocking part 520 on the push rod 500 abuts against the buckle 421 and presses against the buckle 421, so that the buckle 421 disengages from the stop block 110 on the housing 100.

[0063] When the buckle 421 disengages from the stop block 110, the drive member 420 moves relative to the housing 100 along the axis of the housing 100 under the rebound force of the elastic member 440. The protrusion 422 on the drive member 420 slides in the drive groove 411, thereby driving the rotating bracket 410 to rotate around the axis of the housing 100, thereby causing the inner and outer needle tube seats 220 to rotate relative to the housing 100, so that the inner and outer needle tubes 320 rotate relative to the housing 100, thereby completing the supplementary cutting of the target tissue.

[0064] like Figure 3 As shown, in addition to the technical solutions provided in the above embodiments of this utility model, the following technical solutions can also be used to unlock the driving component 420:

[0065] The biopsy needle provided in this embodiment has a structure that is roughly the same as the biopsy needle described above, except that it has a structure for unlocking the drive unit 420.

[0066] like Figure 3 As shown, specifically, the push rod 500 is movably connected to the housing 100, and a firing button 600 is provided on the push rod 500, with one end of the firing button 600 located outside the housing 100. A first protrusion 540 is provided at the position corresponding to the firing button 600, and the first protrusion 540 corresponds to the snap-fit ​​protrusion 700 on the outer needle tube seat 220. When the firing button 600 is pressed, causing the push rod 500 to move a first stroke towards the axis of the housing 100, the first protrusion 540 presses against the snap-fit ​​protrusion 700, causing the snap-fit ​​protrusion 700 to disengage from the abutment protrusion 120 on the housing 100. At this time, the inner and outer needle tube seats 220 are fired. A rotating firing stroke block 530 is provided at the position corresponding to the latch 421 on the drive member 420. After the inner and outer needle tube seats 220 are fired by pressing the firing button 600, the firing button 600 is pressed again, causing the push rod 500 to move a second stroke closer to the axis of the housing 100. At this time, the rotating firing stroke block 530 on the push rod 500 abuts against the latch 421, and causes the latch 421 to disengage from the stop block 110 on the housing 100, thereby unlocking the drive unit 420.

[0067] In this embodiment, by controlling the order and release time of the firing and rotation unlocking processes, the firing and rotation functions can be unlocked using a single firing button 600.

[0068] 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.

[0069] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A biopsy needle, characterized in that, The biopsy needle includes: The shell has a receiving cavity; A needle holder assembly is disposed within the receiving cavity. The needle holder assembly is movable and rotatable relative to the housing. The needle holder assembly is connected to the needle assembly and drives the needle assembly to complete the cutting and sampling of the target tissue. A rotary transmission mechanism is disposed in the receiving cavity. The rotary transmission mechanism is connected to the needle seat assembly. The rotary transmission mechanism can rotate relative to the housing to drive the needle seat assembly to rotate relative to the housing. When the needle seat assembly is fired, the rotary transmission mechanism is unlocked by the needle seat assembly.

2. The biopsy needle according to claim 1, characterized in that, The housing is provided with a stop block, and the rotary transmission mechanism includes a latch that abuts against the stop block to lock the rotation function of the rotary transmission mechanism; the biopsy needle further includes: A push rod is movably connected to the housing. When the needle seat assembly is fired, the needle seat assembly abuts against the push rod and pushes the push rod to move relative to the housing. The push rod presses against the latch to disengage the latch from the stop block.

3. The biopsy needle according to claim 2, characterized in that, The needle holder assembly includes: An inner needle holder is disposed within the receiving cavity, and the inner needle holder is movable relative to the housing. An outer needle holder is disposed within the receiving cavity. The outer needle holder is movable relative to the housing, and the outer needle holder and the inner needle holder are movable relative to each other.

4. The biopsy needle according to claim 3, characterized in that, The push rod is provided with a stop protrusion, and the outer needle tube seat is provided with a push block, the push block and the stop protrusion abut against each other.

5. The biopsy needle according to claim 2, characterized in that, The surface of the buckle that abuts against the push rod is constructed as an inclined surface, and the dimension of the buckle along the radial direction of the housing gradually increases from the direction closer to the push rod to the direction farther away from the push rod.

6. The biopsy needle according to claim 2, characterized in that, The end of the push rod that abuts against the buckle is provided with an unlocking part, which protrudes from the rod body of the push rod.

7. The biopsy needle according to claim 2, characterized in that, The rotary transmission mechanism includes: A rotating bracket is rotatably disposed relative to the housing and is drively connected to the needle holder assembly. The needle holder assembly is movable relative to the rotating bracket along the axial direction of the housing, and the rotating bracket drives the needle holder assembly to rotate relative to the housing. A driving component is provided, which is movable relative to the housing along the axial direction of the housing. The driving component is connected to the rotating bracket to drive the rotating bracket to rotate. The buckle is provided on the driving component.

8. The biopsy needle according to claim 7, characterized in that, The rotary transmission mechanism further includes: The bearing has an outer ring fixedly connected to the housing and an inner ring fixedly connected to the rotating bracket, the inner ring rotating relative to the outer ring.

9. The biopsy needle according to claim 8, characterized in that, The driving component is sleeved on the rotating bracket; the rotating transmission mechanism further includes: An elastic element is sleeved outside the rotating bracket and disposed between the bearing and the driving member. One end of the elastic element abuts against the outer ring of the bearing, and the other end abuts against the driving member. When the buckle abuts against the stop block, the elastic element is in a compressed state. The elastic element provides driving force for the driving member to move along the axial direction of the housing.

10. The biopsy needle according to claim 7, characterized in that, The rotating bracket has a drive groove on its peripheral side; the drive component has a protrusion, a portion of which is slidably disposed within the drive groove. When the driving member moves relative to the housing along the axis of the housing, the protrusion slides along the trajectory of the driving groove, which can drive the rotating bracket to rotate around the axis of the housing.

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