Biopsy needles, biopsy devices and biopsy systems

Abstract

The utility model relates to a biopsy needle, a biopsy device and a biopsy system. The two opposite sides of a sliding sleeve are respectively matched with the limiting structure, so as to limit the moving position of the sliding sleeve relative to the limiting sleeve, thereby ensuring that the sliding sleeve can accurately move to make a first sealing part and a pressure relief port staggered along the axial direction of an inner knife tube or make the first sealing part close the pressure relief port, thereby accurately controlling the connection or cutoff of the air gap with the outside atmosphere, ensuring the smoothness of sampling, and avoiding leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a biopsy needle, a biopsy device and a biopsy system. Background Art

[0002] In clinical medicine, biopsy needles can be used for various operations such as tissue sampling and cell aspiration on various organs. Among them, the biopsy needle includes an inner knife tube and an outer knife tube. Specifically, the outer knife tube is sleeved on the outer peripheral side of the inner knife tube, and an air gap is formed between the inner wall of the outer knife tube and the outer wall of the inner knife tube. The outer knife tube has a relative tip and tail end. The outer knife tube is provided with a window near the tip. The inner knife tube can perform axial linear motion and rotational motion relative to the outer knife tube to close or open the window to achieve sample cutting and sampling. At the same time, in order to connect the air gap with the outside world when the window is closed and sample smoothly, and in order to prevent liquid leakage when the window is opened, a switch valve is set to control the connection or cutoff of the air gap with the outside world. During use, the traditional biopsy needle cannot accurately control the connection or cutoff of the air gap with the outside world, resulting in problems such as poor sampling or leakage. Summary of the invention

[0003] Based on this, it is necessary to provide a biopsy needle, a biopsy device and a biopsy system to address the problem of inconvenient maintenance or repair.

[0004] The technical solution is as follows:

[0005] In one aspect, a biopsy needle is provided, comprising:

[0006] An outer knife tube, wherein the outer knife tube is provided with a tip, a tail and a window, wherein the window is located between the tip and the tail and is arranged close to the tip;

[0007] An inner knife tube, wherein the inner knife tube is provided with a suction channel extending in the axial direction, the inner knife tube comprises a front section, a middle section and a rear section, the front section of the inner knife tube is arranged in the outer knife tube and cooperates with the outer knife tube gap to form an air gap, the middle section and the rear section of the inner knife tube extend out of the tail end of the outer knife tube, and the inner knife tube can reciprocate between a window fully open position and a window fully closed position relative to the outer knife tube along the axial direction of the outer knife tube;

[0008] A limiting sleeve, wherein the limiting sleeve is arranged on the outer peripheral side of the outer knife tube and connected to the tail end, the limiting sleeve and the middle section of the inner knife tube are spaced apart to form a communication channel connected to the air gap, the inner side wall of the communication channel away from the tip is sealed with the inner knife tube, the inner side wall of the communication channel is provided with a limiting structure, and the outer side wall of the limiting sleeve is provided with a pressure relief port selectively connected to the communication channel;

[0009] A sliding sleeve, the sliding sleeve is movably arranged in the connecting passage, the sliding sleeve is arranged on the outer peripheral side of the inner knife tube and can move relative to the inner knife tube in the axial direction, the sliding sleeve is provided with a gas passage, both ends of the gas passage are connected with the connecting passage, and the outer side wall of the sliding sleeve is provided with a first sealing portion that is sealed with the inner side wall of the connecting passage;

[0010] Wherein, when the inner knife tube is in the fully closed position of the window, one side of the sliding sleeve is limitedly matched with the limiting structure, and the first sealing portion and the pressure relief port are arranged at an axial interval along the inner knife tube so that the pressure relief port is connected with the connecting channel; when the inner knife tube is in the fully open position of the window, the other side of the sliding sleeve is limitedly matched with the limiting structure, and the first sealing portion closes the pressure relief port.

[0011] The technical solution is further described below:

[0012] In one embodiment, the limiting structure includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are arranged at intervals along the axial direction of the inner knife tube, and the first limiting portion and the second limiting portion are respectively located on two opposite sides of the pressure relief port; wherein, when the inner knife tube is in a window fully closed position, one side of the sliding sleeve is limitedly matched with the first limiting portion; when the inner knife tube is in a window fully open position, the other side of the sliding sleeve is limitedly matched with the second limiting portion.

[0013] In one embodiment, the connecting passage comprises a front cavity, a middle cavity and a rear cavity which are sequentially connected to each other along the axial direction, the front cavity is arranged relatively close to the tip, the inner diameter of the middle cavity is larger than the inner diameter of the front cavity and the inner diameter of the rear cavity, the connecting part between the front cavity and the middle cavity is formed with the first limiting portion, the connecting part between the middle cavity and the rear cavity is formed with the second limiting portion, and the pressure relief port is correspondingly connected to the middle cavity.

[0014] In one embodiment, the biopsy needle also includes a linkage sleeve and a driving mechanism, wherein the linkage sleeve is arranged relative to the sliding sleeve away from the tip, the linkage sleeve is arranged on the outer side wall of the inner knife tube and is fixedly connected to the inner knife tube, the driving mechanism is transmission-connected with the linkage sleeve to drive the inner knife tube to reciprocate along the axial direction of the outer knife tube between a window fully open position and a window fully closed position, and the linkage sleeve is partially arranged in the connecting channel; wherein, when the inner knife tube is at the window fully closed position, the linkage sleeve and the sliding sleeve are force-coordinated and one side of the sliding sleeve is limitedly cooperated with the first limiting portion; when the inner knife tube is at the window fully open position, the linkage sleeve and the sliding sleeve are non-force-coordinated and the other side of the sliding sleeve is limitedly cooperated with the second limiting portion.

[0015] In one embodiment, the sliding sleeve is movably arranged in the middle cavity, the outer side wall of the linkage sleeve is provided with a second sealing portion, and the linkage sleeve is sealed with the inner side wall of the rear cavity through the second sealing portion, and an end surface channel extending in the radial direction is provided on one end of the linkage sleeve facing the sliding sleeve;

[0016] When one side of the sliding sleeve is limitedly matched with the first limiting part, the gas channel and the end surface channel are adjacent to each other and connected; when the other side of the sliding sleeve is limitedly matched with the second limiting part, the gas channel and the end surface channel are separated.

[0017] In one embodiment, the sliding sleeve includes a first sleeve body and a second sleeve body connected to each other, the first sleeve body is movably arranged in the middle cavity, the first sleeve body is provided with the gas passage, the outer wall of the first sleeve body is provided with the first sealing portion, the second sleeve body is arranged away from the tip relative to the first sleeve body, the outer wall of the second sleeve body is sealed with the inner wall of the rear cavity, and the inner wall of the second sleeve body is sealed with the outer wall of the inner knife tube; wherein, when the inner knife tube is in the window fully closed position, the linkage sleeve and the second sleeve body are force-coordinated and one side of the first sleeve body is limitedly cooperated with the first limiting portion; when the inner knife tube is in the window fully open position, the linkage sleeve and the second sleeve body are non-force-coordinated and the other side of the first sleeve body is limitedly cooperated with the second limiting portion.

[0018] In one embodiment, the outer side wall of the second sleeve is provided with a third sealing portion, through which the second sleeve is sealed and matched with the inner side wall of the rear cavity; the inner side wall of the second sleeve is provided with a fourth sealing portion, through which the second sleeve is sealed and matched with the outer side wall of the inner knife tube.

[0019] In one embodiment, the biopsy needle also includes an elastic reset member, one end of which is connected to the sliding sleeve, and the other end of which is connected to the limiting sleeve, and the elastic reset member is constructed to be in a deformed state when the first sealing portion and the pressure relief port are arranged axially at intervals along the inner knife tube to apply a reset force to the sliding sleeve to drive the sliding sleeve to move until the first sealing portion closes the pressure relief port.

[0020] In one of the embodiments, the elastic return member is arranged close to the tip relative to the sliding sleeve, and the single-side width of the front cavity matches the single-side width of the elastic return member.

[0021] In one embodiment, the first sealing portion includes a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are both sleeved on the outer side wall of the sliding sleeve and spaced apart along the axial direction of the inner knife tube, and the first sealing ring and the second sealing ring are both sealed with the inner side wall of the connecting channel;

[0022] Wherein, when the inner knife tube is in the window fully closed position, the first sealing ring and the second sealing ring are both located on the side of the pressure relief port close to the tip; when the inner knife tube is in the window fully open position, the sliding sleeve moves so that the pressure relief port is located between the first sealing ring and the second sealing ring.

[0023] In another aspect, a biopsy device is provided, comprising:

[0024] A biopsy handle having a power source, wherein the power source is used to provide power for the movement of the inner knife tube;

[0025] A biopsy needle, which is any of the biopsy needles described above, and which is arranged on the biopsy handle.

[0026] On the other hand, a biopsy system is provided, comprising: a negative pressure source and any one of the above-mentioned biopsy devices, wherein the negative pressure source is connected to the suction channel, and the negative pressure source is used to provide negative pressure in the suction channel.

[0027] In the biopsy needle, biopsy device and biopsy system of the above-mentioned embodiments, when the inner knife tube is in the window fully closed position, one side of the sliding sleeve cooperates with the limiting structure, and the first sealing portion and the pressure relief port are spaced apart along the axial direction of the inner knife tube, so that the limiting cooperation between one side of the sliding sleeve and the limiting structure ensures that the first sealing portion can be accurately spaced apart from the pressure relief port in the axial direction of the inner knife tube, so that the pressure relief port and the connecting channel are accurately connected, and then the air gap is accurately connected with the outside atmosphere through the pressure relief port, and then the suction channel can be accurately connected with the outside atmosphere, thereby ensuring the smoothness of sampling. When the inner knife tube is in the fully open window position, the other side of the sliding sleeve cooperates with the limiting structure, and the first sealing part closes the pressure relief port, thereby ensuring that the first sealing part can accurately close the pressure relief port through the limiting cooperation between the other side of the sliding sleeve and the limiting structure, so that the pressure relief port is accurately isolated from the connecting channel, and the air gap is accurately isolated from the outside atmosphere through the pressure relief port, and then the suction channel can be accurately cut off from the outside atmosphere to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic structural diagram of a biopsy needle according to an embodiment;

[0031] Figure 2 for Figure 1 A partial enlarged view of part A of the biopsy needle;

[0032] Figure 3 for Figure 1 Axial cross-sectional view of the biopsy needle when the window is fully open;

[0033] Figure 4 for Figure 1 Axial cross-sectional view of the biopsy needle when the window is fully closed;

[0034] Figure 5 for Figure 4 A partial enlarged view of part B of the biopsy needle;

[0035] Figure 6 for Figure 4 A partial enlarged view of the biopsy needle C portion;

[0036] Figure 7 FIG. 1 is an axial cross-sectional view of a biopsy needle according to another embodiment when the window is in a fully open state.

[0037] Description of reference numerals:

[0038] 10. Biopsy needle; 100. Outer knife tube; 110. Tip; 120. Tail end; 130. Window; 200. Inner knife tube; 210. Suction channel; 300. Air gap; 400. Limit sleeve; 410. Limit structure; 411. First limit part; 412. Second limit part; 420. Pressure relief port; 500. Communication channel; 510. Front cavity; 520. Middle cavity; 530. Back cavity; 600. Sliding sleeve; 610. Gas channel; 620. First sealing part; 621. First sealing ring; 622. Second sealing ring; 630. First sleeve body; 640. Second sleeve body; 641. Third sealing part; 642. Fourth sealing part; 700. Linkage sleeve; 710. Second sealing part; 800. Driving mechanism; 900. Elastic reset member; 1000. Switch element. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0040] During the use of the biopsy needle, the inner knife tube is driven by the driving mechanism to perform axial linear motion and rotational motion relative to the outer knife tube to close or open the window. Specifically, when the inner knife tube performs axial linear motion relative to the outer knife tube, the inner knife tube reciprocates between the window fully closed position and the window fully open position. When the inner knife tube is at the window fully closed position, the window is fully closed, when the inner knife tube is at the window fully open position, the window is fully opened, and when the inner knife tube is at a position between the window fully closed position and the window fully open position, the window is partially opened. More specifically, when the inner knife tube moves from the fully open window position to the fully closed window position relative to the outer knife tube, the suction device needs to suck out the blood and cut tissue through the suction channel of the inner knife tube to complete the sampling. In order to ensure smooth sampling, the air gap needs to be connected to the outside atmosphere so that the suction channel in the inner knife tube and the outside atmosphere can achieve air circulation to smoothly suck the blood and the cut tissue into the collector; when the inner knife tube is in the fully open window position, that is, the inner knife tube is in the fully open window position relative to the outer knife tube, in order to ensure that leakage of liquids such as blood does not occur, the air gap needs to be isolated from the outside atmosphere.

[0041] In order to selectively connect or isolate the air gap from the outside atmosphere, a conventional biopsy needle sets a switch valve to control the connection or cutoff of the air gap from the outside atmosphere. However, during use, the conventional biopsy needle sets a first valve element on the inner blade tube and a second valve element on the outer blade tube, and the two valve elements are in sealing contact to isolate the air gap from the outside atmosphere, and the two valve elements are staggered to connect the air gap with the outside atmosphere. Since the two valve elements are made of elastic materials, the two valve elements cannot accurately achieve sealing contact or stagger, resulting in the inability to accurately control the isolation or connection of the air gap from the outside atmosphere.

[0042] like Figures 1 to 7 As shown, one embodiment of the present application provides a biopsy needle 10 , including an outer knife tube 100 , an inner knife tube 200 , a limiting sleeve 400 and a sliding sleeve 600 .

[0043] like Figure 1 , Figure 2 and Figure 5 As shown, the outer blade tube 100 is provided with a tip 110, a tail end 120 and a window 130. The tip 110 can be used to insert into tissue for sampling. The tail end 120 is the other end relative to the tip 110, and the window 130 is located between the tip 110 and the tail end 120, and the window 130 is arranged close to the tip 110.

[0044] It should be noted that the overall structure of the outer knife tube 100 can adopt the existing structure. The outer knife tube 100 can be hollow tube-shaped except for the tip 110. The window 130 can be in a long strip or other contour shape. The window 130 is connected to the inner cavity of the outer knife tube 100, so that the tissue cut off can enter the suction channel 210 of the inner knife tube 200 through the window 130.

[0045] like Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the inner knife tube 200 is provided with a suction channel 210 extending in the axial direction, and the inner knife tube 200 includes a front section, a middle section and a rear section. The front section of the inner knife tube 200 is arranged in the outer knife tube 100 and is gap-matched with the outer knife tube 100 to form an air gap 300, that is, the outer wall of the inner knife tube 200 and the inner wall of the outer knife tube 100 are spaced to form the air gap 300, and the middle section and the rear section of the inner knife tube 200 extend out of the tail end 120 of the outer knife tube 100. In addition, the inner knife tube 200 can reciprocate between the fully open position of the window 130 and the fully closed position of the window 130 relative to the outer knife tube 100 along the axial direction of the outer knife tube 100 under the drive of the driving mechanism 800, and the window 130 is opened or closed by the movement of the inner knife tube 200 relative to the outer knife tube 100.

[0046] like Figures 3 to 7As shown, the limiting sleeve 400 is arranged on the outer peripheral side of the outer knife tube 100 and is connected to the tail end 120 by welding, screwing or clamping. In addition, the limiting sleeve 400 and the middle section of the inner knife tube 200 are spaced apart to form a connecting channel 500 connected to the air gap 300. In addition, the inner side wall of the connecting channel 500 is provided with a limiting structure 410. The outer side wall of the limiting sleeve 400 is provided with a pressure relief port 420 that can be selectively closed or connected to the connecting channel 500. For example, the pressure relief port 420 extends along the radial direction of the limiting sleeve 400 and is connected to the connecting channel 500.

[0047] During use, the limiting sleeve 400 can serve as a handle for holding to facilitate clinical operation. In addition, in actual use, a sheath or other components can be sleeved on the outer wall of the limiting sleeve 400 to facilitate holding and prevent slipping.

[0048] It should be noted that the connection between the limiting sleeve 400 and the outer knife tube 100 can be achieved not only by assembling them after separate processing, but also by integral molding.

[0049] In actual use, a switch element 1000 such as an air valve can also be installed in the pressure relief port 420, wherein the switch element 1000 can be detachably arranged in the pressure relief port 420 in the form of plugging. In this way, the pressure relief port 420 can be connected or cut off with the outside world by opening or closing the switch element 1000.

[0050] The pressure relief port 420 can be directly provided on the outer wall of the limiting sleeve 400, so as to be able to install the switch element 1000. Of course, in order to ensure the reliability of the installation of the switch element 1000, a mounting structure such as a mounting boss can be provided on the outer wall of the limiting sleeve 400 along the radial direction of the limiting sleeve 400, and a pressure relief port 420 connected to the connecting channel 500 is provided on the mounting boss and other mounting structures, and the mounting boss is used to increase the contact area with the switch element 1000, so as to ensure the stability of the installation of the switch element 1000.

[0051] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the sliding sleeve 600 is movably disposed in the communication channel 500. Specifically, the sliding sleeve 600 can reciprocate along the axial direction of the inner knife tube 200 relative to the limiting sleeve 400. In addition, the sliding sleeve 600 is sleeved on the outer peripheral side of the inner knife tube 200. The sliding sleeve 600 is provided with a gas channel 610. Both ends of the gas channel 610 are connected to the communication channel 500. For example, Figure 6In the example, along the axial direction of the inner knife tube 200, the gas channel 610 can pass through the opposite sides of the sliding sleeve 600, so that both ends of the gas channel 610 are connected to the communication channel 500. At the same time, the outer side wall of the sliding sleeve 600 is provided with a first sealing portion 620 that seals with the inner side wall of the communication channel 500.

[0052] In one embodiment, the inner wall of the sliding sleeve 600 and the outer wall of the inner knife tube 200 are spaced apart to form a gas channel 610 .

[0053] like Figure 4 and Figure 6 As shown, when the inner knife tube 200 is in the fully closed position of the window 130, one side of the sliding sleeve 600 cooperates with the limiting structure 410, and the first sealing portion 620 and the pressure relief port 420 are spaced apart along the axial direction of the inner knife tube 200, so that the first sealing portion 620 can be accurately spaced apart from the pressure relief port 420 in the axial direction of the inner knife tube 200 through the limiting cooperation between one side of the sliding sleeve 600 and the limiting structure 410, so that the pressure relief port 420 and the connecting channel 500 can be accurately connected, and then the air gap 300 can be accurately connected with the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately connected with the outside atmosphere, and the smoothness of sampling can be ensured. Figure 3 As shown, when the inner knife tube 200 is in the fully open position of the window 130, the other side of the sliding sleeve 600 is limited by the limiting structure 410, and the first sealing portion 620 closes the pressure relief port 420, so that the other side of the sliding sleeve 600 is limited by the limiting structure 410 to ensure that the first sealing portion 620 can accurately close the pressure relief port 420, so that the pressure relief port 420 is accurately isolated from the connecting channel 500, and the air gap 300 is accurately isolated from the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately cut off from the outside atmosphere to avoid leakage.

[0054] The biopsy needle 10 of the above-mentioned embodiment limits the movement position of the sliding sleeve 600 relative to the limiting sleeve 400 by respectively cooperating with the limiting structure 410 on the opposite sides of the sliding sleeve 600, thereby ensuring that the sliding sleeve 600 can be accurately moved to the point where the first sealing portion 620 and the pressure relief port 420 are offset along the axial direction of the inner knife tube 200 or the first sealing portion 620 closes the pressure relief port 420, thereby accurately controlling the connection or cutoff of the air gap 300 with the outside atmosphere, ensuring the smoothness of sampling, and avoiding leakage.

[0055] like Figure 3 and Figure 6As shown, optionally, the limiting structure 410 includes a first limiting portion 411 and a second limiting portion 412. The first limiting portion 411 and the second limiting portion 412 are arranged at intervals along the axial direction of the inner knife tube 200, and the first limiting portion 411 and the second limiting portion 412 are respectively located on two opposite sides of the pressure relief port 420. Figure 6 As shown, when the inner knife tube 200 is in the fully closed position of the window 130, one side of the sliding sleeve 600 is limitedly matched with the first limiting portion 411; Figure 3 As shown, when the inner knife tube 200 is in the fully open position of the window 130, the other side of the sliding sleeve 600 is limited and matched with the second limiting portion 412. In this way, the moving position of the sliding sleeve 600 is limited by the first limiting portion 411 and the second limiting portion 412 respectively, ensuring that when the inner knife tube 200 is in different positions, the sliding sleeve 600 can accurately move to the corresponding position to achieve the first sealing portion 620 and the pressure relief port 420 staggered along the axial direction of the inner knife tube 200 or the first sealing portion 620 closes the pressure relief port 420, thereby accurately controlling the connection or cutoff of the air gap 300 with the outside atmosphere, ensuring the smoothness of sampling, and avoiding leakage.

[0056] The first limiting portion 411 may be in the form of a limiting protrusion or a limiting retaining ring, and may be realized by being assembled and connected with the limiting sleeve 400 or by being integrally formed with the limiting sleeve 400.

[0057] The second limiting portion 412 may be in the form of a limiting protrusion or a limiting retaining ring, and may be realized by being assembled and connected with the limiting sleeve 400 or by being integrally formed with the limiting sleeve 400.

[0058] like Figure 3 , Figure 6 and Figure 7As shown, in one embodiment, the communication channel 500 includes a front cavity 510, a middle cavity 520 and a rear cavity 530 which are sequentially connected to each other in the axial direction. Specifically, the front cavity 510 is arranged relatively close to the tip 110. The inner diameter of the middle cavity 520 is larger than the inner diameter of the front cavity 510 and the inner diameter of the rear cavity 530. The communication portion of the front cavity 510 and the middle cavity 520 is formed with a first limiting portion 411, and the communication portion of the middle cavity 520 and the rear cavity 530 is formed with a second limiting portion 412. The pressure relief port 420 is correspondingly connected to the middle cavity 520. In this way, by setting the first limiting portion 411 at the transition position between the front cavity 510 and the middle cavity 520, and setting the second limiting portion 412 at the transition position between the rear cavity 530 and the middle cavity 520, the first limiting portion 411 and the second limiting portion 412 are set at intervals along the axial direction of the inner knife tube 200, and the first limiting portion 411 and the second limiting portion 412 can respectively cooperate with the two opposite sides of the sliding sleeve 600 to ensure that when the inner knife tube 200 is in different positions, the sliding sleeve 600 can accurately move to the corresponding position to achieve the axial offset of the first sealing portion 620 and the pressure relief port 420 along the inner knife tube 200 or the first sealing portion 620 closes the pressure relief port 420, thereby accurately controlling the connection or cutoff of the air gap 300 with the external atmosphere, ensuring the smoothness of sampling, and avoiding leakage.

[0059] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, further, the biopsy needle 10 also includes a linkage sleeve 700 and a driving mechanism 800. The linkage sleeve 700 is arranged relative to the sliding sleeve 600 away from the tip 110, that is, the linkage sleeve 700 is arranged on the side of the sliding sleeve 600 away from the tip 110. The linkage sleeve 700 is sleeved on the outer wall of the inner knife tube 200 and is fixedly connected to the inner knife tube 200, so that the inner knife tube 200 and the linkage sleeve 700 can synchronously reciprocate along the axial direction of the inner knife tube 200. In addition, the driving mechanism 800 is transmission-connected with the linkage sleeve 700 to drive the inner knife tube 200 to reciprocate along the axial direction of the outer knife tube 100 between the fully open position of the window 130 and the fully closed position of the window 130, and the linkage sleeve 700 is partially arranged in the connecting channel 500. At the same time, when the inner knife tube 200 is in the fully closed position of the window 130, the linkage sleeve 700 and the sliding sleeve 600 cooperate with each other with force and make one side of the sliding sleeve 600 cooperate with the first limiting portion 411; when the inner knife tube 200 is in the fully open position of the window 130, the linkage sleeve 700 and the sliding sleeve 600 cooperate without force and make the other side of the sliding sleeve 600 cooperate with the second limiting portion 412.

[0060] It can be understood that the force-cooperation between the linkage sleeve 700 and the sliding sleeve 600 means that there is a mutual force between the linkage sleeve 700 and the sliding sleeve 600. The non-force-cooperation between the linkage sleeve 700 and the sliding sleeve 600 means that there may be no mutual force between the linkage sleeve 700 and the sliding sleeve 600.

[0061] like Figure 6 As shown, specifically, when the inner knife tube 200 moves toward the fully closed position of the window 130 under the drive of the driving mechanism 800, the linkage sleeve 700 moves synchronously with the inner knife tube 200, so that the linkage sleeve 700 applies a resisting force to the sliding sleeve 600 and drives the sliding sleeve 600 to move relative to the limiting sleeve 400 along the axial direction of the inner knife tube 200 toward the tip 110 until the inner knife tube 200 moves to the fully closed position of the window 130. At this time, one side of the sliding sleeve 600 is in contact with the first The limiting part 411 is in limiting cooperation, and the other side of the sliding sleeve 600 is in contact cooperation with the linkage sleeve 700. The first sealing part 620 can be accurately spaced from the pressure relief port 420 in the axial direction of the inner knife tube 200, so that the pressure relief port 420 and the connecting channel 500 are accurately connected, and then the air gap 300 is accurately connected with the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately connected with the outside atmosphere, thereby ensuring the smoothness of sampling. Figure 3 As shown, when the inner knife tube 200 moves toward the fully open position of the window 130 driven by the driving mechanism 800, the linkage sleeve 700 moves synchronously with the inner knife tube 200, so that the resistance force applied by the linkage sleeve 700 to the sliding sleeve 600 disappears, and the sliding sleeve 600 moves relative to the limiting sleeve 400 along the axial direction of the inner knife tube 200 toward the direction away from the tip 110 until the inner knife tube 200 moves to the fully open position of the window 130. At this time, the other side of the sliding sleeve 600 is limited by the second limiting portion 412, and the first sealing portion 620 accurately closes the pressure relief port 420, so that the pressure relief port 420 is accurately isolated from the connecting channel 500, and then the air gap 300 is accurately isolated from the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately cut off from the outside atmosphere to avoid leakage.

[0062] It should be noted that the drive mechanism 800 can adopt an existing structure or construction, and only needs to be able to drive the inner blade tube 200 to move relative to the outer blade tube 100 to complete the corresponding rotary cutting, closing and opening of the window 130. The drive mechanism 800 can drive the inner blade tube 200 directly or indirectly by setting an intermediate element.

[0063] like Figure 3 and Figure 6As shown, in one embodiment, the sliding sleeve 600 can be movably arranged in the middle cavity 520. In this way, the sliding sleeve 600 can be completely arranged in the middle cavity 520, and the movement of the sliding sleeve 600 is limited by the first limiting portion 411 and the second limiting portion 412, ensuring that the sliding sleeve 600 can accurately move to make the first sealing portion 620 and the pressure relief port 420 staggered along the axial direction of the inner knife tube 200 or the first sealing portion 620 closes the pressure relief port 420, thereby accurately controlling the connection or cutoff of the air gap 300 with the external atmosphere, ensuring the smoothness of sampling, and avoiding leakage. At the same time, a second sealing portion 710 is provided on the outer wall of the linkage sleeve 700, and the second sealing portion 710 enables the linkage sleeve 700 to be sealed with the inner wall of the rear cavity 530. In this way, under the sealing action of the second sealing portion 710, blood and other liquids in the connecting channel 500 can be effectively prevented from leaking through the gap between the linkage sleeve 700 and the limiting sleeve 400, thereby avoiding contamination or damage to the driving mechanism 800 or other components.

[0064] The second sealing portion 710 may be in the form of a sealing ring or a sealing sleeve.

[0065] In this embodiment, an end surface channel extending in the radial direction is provided on the linkage sleeve 700 at one end facing the sliding sleeve 600. When one side of the sliding sleeve 600 is limited and matched with the first limiting portion 411, the gas channel 610 and the end surface channel (not shown) are adjacent to each other and connected, that is, one end of the gas channel 610 is directly connected with the connecting channel, and the other end of the gas channel 610 is indirectly connected with the connecting channel through the end surface channel; when the other side of the sliding sleeve 600 is limited and matched with the second limiting portion 412, the gas channel 610 is separated from the end surface channel (not shown), and the two ends of the gas channel 610 are directly connected with the connecting channel. Figure 7As shown, in another embodiment, the sliding sleeve 600 includes a first sleeve body 630 and a second sleeve body 640 connected to each other. The first sleeve body 630 is movably arranged in the middle cavity 520, the first sleeve body 630 is provided with a gas channel 610, and the outer wall of the first sleeve body 630 is provided with a first sealing portion 620. In addition, the second sleeve body 640 is arranged away from the tip 110 relative to the first sleeve body 630, the outer wall of the second sleeve body 640 is sealed with the inner wall of the rear cavity 530, and the inner wall of the second sleeve body 640 is sealed with the outer wall of the inner knife tube 200, so that the blood and other liquids in the communication channel 500 can be effectively prevented from leaking through the gap between the second sleeve body 640 and the limiting sleeve 400 and the gap between the second sleeve body 640 and the inner knife tube 200, thereby avoiding contamination or damage to the driving mechanism 800 or other components. Among them, when the inner knife tube 200 is in the fully closed position of the window 130, the linkage sleeve 700 and the second sleeve 640 cooperate with each other with force and make one side of the first sleeve 630 cooperate with the first limit part 411; when the inner knife tube 200 is in the fully open position of the window 130, the linkage sleeve 700 and the second sleeve 640 have no force cooperation and make the other side of the first sleeve 630 cooperate with the second limit part 412.

[0066] Specifically, when the inner knife tube 200 moves toward the fully closed position of the window 130 under the drive of the driving mechanism 800, the linkage sleeve 700 moves synchronously with the inner knife tube 200, so that the linkage sleeve 700 applies a resistance force to the second sleeve 640 and drives the first sleeve 630 to move relative to the limiting sleeve 400 along the axial direction of the inner knife tube 200 toward the tip 110 until the inner knife tube 200 moves to the fully closed position of the window 130. At this time, one side of the first sleeve 630 is in contact with the second sleeve 640. The first limiting portion 411 is limited and matched, the second sleeve body 640 and the linkage sleeve 700 are in contact and matched, and the first sealing portion 620 can be accurately spaced from the pressure relief port 420 in the axial direction of the inner knife tube 200, so that the pressure relief port 420 and the connecting channel 500 are accurately connected, and then the air gap 300 is accurately connected with the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately connected with the outside atmosphere, ensuring the smoothness of sampling. Figure 7As shown, when the inner knife tube 200 moves toward the fully open position of the window 130 under the drive of the driving mechanism 800, the linkage sleeve 700 moves synchronously with the inner knife tube 200, so that the resistance force applied by the linkage sleeve 700 to the second sleeve body 640 disappears, and the first sleeve body 630 and the second sleeve body 640 both move relative to the limiting sleeve 400 along the axial direction of the inner knife tube 200 toward the direction away from the tip 110 until the inner knife tube 200 moves to the fully open position of the window 130. At this time, the other side of the first sleeve body 630 is limited by the second limiting portion 412, and the first sealing portion 620 accurately closes the pressure relief port 420, so that the pressure relief port 420 is accurately isolated from the connecting channel 500, and then the air gap 300 is accurately isolated from the outside atmosphere through the pressure relief port 420, and then the suction channel 210 can be accurately cut off from the outside atmosphere to avoid leakage.

[0067] like Figure 7 As shown, optionally, the outer side wall of the second sleeve 640 is provided with a third sealing portion 641, through which the second sleeve 640 and the inner side wall of the rear cavity 530 are sealed and matched; the inner side wall of the second sleeve 640 is provided with a fourth sealing portion 642, through which the second sleeve 640 and the outer side wall of the inner knife tube 200 are sealed and matched. In this way, under the sealing effect of the third sealing portion 641 and the sealing effect of the fourth sealing portion 642, it is possible to effectively prevent the blood and other liquids in the communication channel 500 from leaking through the gap between the second sleeve 640 and the limiting sleeve 400 and the gap between the second sleeve 640 and the inner knife tube 200, thereby preventing the driving mechanism 800 or other components from being contaminated or damaged.

[0068] The third sealing portion 641 may be in the form of a sealing ring or a sealing sleeve.

[0069] The fourth sealing portion 642 may be in the form of a sealing ring or a sealing sleeve.

[0070] like Figures 3 to 7As shown, in addition, the biopsy needle 10 further includes an elastic reset member 900. One end of the elastic reset member 900 is connected to the sliding sleeve 600 by plugging or the like, and the other end of the elastic reset member 900 is connected to the limiting sleeve 400 by snapping or the like. Moreover, the elastic reset member 900 is configured to be in a deformed state when the first sealing portion 620 and the pressure relief port 420 are arranged at intervals along the axial direction of the inner knife tube 200 so as to apply a reset force to the sliding sleeve 600 and drive the sliding sleeve 600 to move until the first sealing portion 620 closes the pressure relief port 420. In this way, when the inner knife tube 200 synchronously drives the linkage sleeve 700 to move along the axial direction of the inner knife tube 200 toward the tip 110 to the fully closed position of the window 130, the linkage sleeve 700 applies a resistance force along the direction toward the tip 110 to the sliding sleeve 600, so that the sliding sleeve 600 applies force to the elastic reset member 900 to deform the elastic reset member 900 until the sliding sleeve 600 moves relative to the limiting sleeve 400 so that one side of the sliding sleeve 600 is limitedly matched with the first limiting portion 411. At this time, the first sealing portion 620 and the pressure relief port 420 are staggered along the axial direction of the inner knife tube 200 so that the connecting channel 500 is connected with the pressure relief port 420. The elastic reset member 900 can be in an extreme state of deformation, and the elastic reset member 900 applies a reset force along the axial direction of the inner knife tube 200 toward the direction away from the tip 110 to the sliding sleeve 60 0, when the inner knife tube 200 moves from the fully closed position of the window 130 to the fully open position of the window 130, the linkage sleeve 700 moves synchronously with the inner knife tube 200 along the axial direction of the inner knife tube 200 toward the direction away from the tip 110 until there is no force cooperation with the sliding sleeve 600. At this time, the resistance force applied by the linkage sleeve 700 to the upper edge of the sliding sleeve 600 toward the direction close to the tip 110 disappears, and the sliding sleeve 600 moves along the axial direction of the inner knife tube 200 toward the direction away from the tip 110 under the action of the reset force until the other side of the sliding sleeve 600 is limitedly cooperated with the second limiting portion 412. At this time, the first sealing portion 620 and the pressure relief port 420 are correspondingly arranged along the axial direction of the inner knife tube 200, so that the first sealing portion 620 shields the pressure relief port 420 and closes the pressure relief port 420, thereby making the connecting channel 500 and the pressure relief port 420 cut off.

[0071] The elastic reset member 900 may be a spring or other element that has elastic deformation and can provide a reset force. The deformation of the elastic reset member 900 may be a compression deformation or a tension deformation.

[0072] like Figures 3 to 7As shown, in addition, the elastic reset member 900 is arranged near the tip 110 relative to the sliding sleeve 600, so that when the sliding sleeve 600 moves to cooperate with the first limiting portion 411, the first sealing portion 620 and the pressure relief port 420 are arranged at intervals along the axial direction of the inner knife tube 200, and the elastic reset member 900 is in a compression deformation state, that is, when the sliding sleeve 600 moves along the axial direction of the inner knife tube 200 toward the tip 110 under the force of the linkage sleeve 700, the sliding sleeve 600 pushes the elastic reset member 900 to undergo compression deformation, so that the elastic reset member 900 in the compression deformation state applies a reset force to the sliding sleeve 600 along the axial direction of the inner knife tube 200 and in the direction away from the tip 110. When the sliding sleeve 600 moves to the limit position with the second limiting portion 412, the first sealing portion 620 closes the pressure relief port 420, and the elastic reset member 900 can be in a natural state. In this way, the linkage sleeve 700 moves synchronously with the inner knife tube 200 along the axial direction of the inner knife tube 200 toward the direction away from the tip 110, and the resistance force applied by the linkage sleeve 700 to the sliding sleeve 600 in the direction close to the tip 110 disappears. The sliding sleeve 600 moves along the inner knife tube 200 under the action of the reset force applied by the elastic reset member 900 in the direction away from the tip 110. The sliding sleeve 600 is moved axially in a direction away from the tip 110 until the sliding sleeve 600 is limitedly matched with the second limiting portion 412, and the first sealing portion 620 and the pressure relief port 420 are correspondingly arranged along the axial direction of the inner knife tube 200, so that the first sealing portion 620 shields the pressure relief port 420 and closes the pressure relief port 420, and the elastic reset member 900 can be in a natural state, and the reset member applied by the elastic reset member 900 to the sliding sleeve 600 disappears, so that the sliding sleeve 600 is kept at the position where the first sealing portion 620 closes the pressure relief port 420. In addition, the single-side width (such as Figure 5 D) and the single side width of the elastic reset member 900 (as shown in Figure 5 d), thereby guiding the compression and extension of the elastic reset member 900, preventing the elastic reset member 900 from twisting or bending, and further ensuring that the elastic reset member 900 can drive the sliding sleeve 600 to accurately move to the first limiting portion 411 or the second limiting portion 412 to match the limiting portion.

[0073] It can be understood that the single-side width refers to the width on one side of the central axis.

[0074] like Figure 3 , Figure 4 and Figure 6As shown, in one embodiment, the first sealing portion 620 includes a first sealing ring 621 and a second sealing ring 622. The first sealing ring 621 and the second sealing ring 622 are both sleeved on the outer wall of the sliding sleeve 600 and spaced apart along the axial direction of the inner knife tube 200. In addition, the first sealing ring 621 and the second sealing ring 622 are both sealed and fitted with the inner wall of the communication channel 500. Moreover, when the inner knife tube 200 is in the fully closed position of the window 130, the first sealing ring 621 and the second sealing ring 622 are both located on the side of the pressure relief port 420 close to the tip 110, that is, the first sealing ring 621 and the second sealing ring 622 are both located on the same side of the pressure relief port 420, so that the connecting channel 500 is connected with the pressure relief port 420; when the inner knife tube 200 is in the fully open position of the window 130, the sliding sleeve 600 moves so that the pressure relief port 420 is located between the first sealing ring 621 and the second sealing ring 622, that is, along the axial direction of the inner knife tube 200, the first sealing ring 621 and the second sealing ring 622 are respectively located on the opposite sides of the pressure relief port 420, so that the connecting channel 500 is cut off from the pressure relief port 420.

[0075] Any of the biopsy needles described above can be applied to a biopsy device, which includes the biopsy handle and the biopsy needle, the biopsy handle having a power source, the power source being used to provide power for the movement of the inner blade tube, and the biopsy needle being arranged on the biopsy handle. The power provided by the power source can be transmitted to the inner blade tube through the driving mechanism, and the biopsy needle and the biopsy handle can be detachably arranged or integrally arranged.

[0076] The biopsy device is a part of the biopsy system. The biopsy system also includes a negative pressure source. The negative pressure source is connected to the suction channel of the biopsy needle. The negative pressure source is used to provide negative pressure in the suction channel.

[0077] It should be noted that "some body" or "some part" can be a part of the corresponding "component", that is, "some body" or "some part" can be integrally formed with the "other parts of the component"; it can also be an independent component that can be separated from the "other parts of the component", that is, "some body" or "some part" can be manufactured independently and then combined with the "other parts of the component" into a whole. The expression of the above-mentioned "some body" or "some part" in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as it contains the above-mentioned features and has the same function, it should be understood as an equivalent technical solution of this application.

[0078] It should be noted that the components included in the "unit", "assembly", "mechanism" and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as the above components are included and have the same functions, it should be understood that it is an equivalent technical solution of this application.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more related listed items.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] It should be noted that when an element is referred to as being "fixed on", "set on", "fixed on" or "installed on" another element, it can be directly on the other element or there can be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a central element at the same time. Further, when an element is considered to be "fixed transmission connected" to another element, the two can be fixed in a detachable connection manner or in a non-detachable connection, as long as power transmission can be achieved, such as socketing, snap-on, one-piece molding fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0084] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0086] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A biopsy needle, characterized in that: include: An outer knife tube, wherein the outer knife tube is provided with a tip, a tail and a window, wherein the window is located between the tip and the tail and is arranged close to the tip; An inner knife tube, wherein the inner knife tube is provided with a suction channel extending in the axial direction, the inner knife tube comprises a front section, a middle section and a rear section, the front section of the inner knife tube is arranged in the outer knife tube and cooperates with the outer knife tube gap to form an air gap, the middle section and the rear section of the inner knife tube extend out of the tail end of the outer knife tube, and the inner knife tube can reciprocate relative to the outer knife tube along the axial direction of the outer knife tube between a window fully open position and a window fully closed position; A limiting sleeve, wherein the limiting sleeve is arranged on the outer peripheral side of the outer knife tube and connected to the tail end, the limiting sleeve and the middle section of the inner knife tube are spaced apart to form a communication channel connected to the air gap, the inner side wall of the communication channel away from the tip is sealed with the inner knife tube, the inner side wall of the communication channel is provided with a limiting structure, and the outer side wall of the limiting sleeve is provided with a pressure relief port that can be selectively closed or connected to the communication channel; A sliding sleeve, the sliding sleeve is movably arranged in the connecting passage, the sliding sleeve is arranged on the outer peripheral side of the inner knife tube, the sliding sleeve is provided with a gas passage, both ends of the gas passage are connected with the connecting passage, and the outer side wall of the sliding sleeve is provided with a first sealing portion that is sealed with the inner side wall of the connecting passage; Wherein, when the inner knife tube is in the fully closed position of the window, one side of the sliding sleeve is limitedly matched with the limiting structure, and the first sealing portion and the pressure relief port are arranged at an axial interval along the inner knife tube so that the pressure relief port is connected with the connecting channel; when the inner knife tube is in the fully open position of the window, the other side of the sliding sleeve is limitedly matched with the limiting structure, and the first sealing portion closes the pressure relief port.

2. The biopsy needle according to claim 1, characterized in that: The limiting structure includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are arranged at intervals along the axial direction of the inner knife tube, and the first limiting portion and the second limiting portion are respectively located on two opposite sides of the pressure relief port; wherein, when the inner knife tube is in a window fully closed position, one side of the sliding sleeve is limitedly matched with the first limiting portion; when the inner knife tube is in a window fully open position, the other side of the sliding sleeve is limitedly matched with the second limiting portion.

3. The biopsy needle according to claim 2, characterized in that: The communicating passage comprises a front cavity, a middle cavity and a rear cavity which are sequentially connected to each other along the axial direction, the front cavity is arranged relatively close to the tip, the inner diameter of the middle cavity is larger than the inner diameter of the front cavity and the inner diameter of the rear cavity, the communicating part between the front cavity and the middle cavity is formed with the first limiting part, the communicating part between the middle cavity and the rear cavity is formed with the second limiting part, and the pressure relief port is correspondingly connected to the middle cavity.

4. The biopsy needle according to claim 3, characterized in that: The biopsy needle also includes a linkage sleeve and a driving mechanism, wherein the linkage sleeve is arranged relative to the sliding sleeve away from the tip, the linkage sleeve is arranged on the outer side wall of the inner knife tube and is fixedly connected to the inner knife tube, the driving mechanism is drivingly connected to the linkage sleeve to drive the inner knife tube to reciprocate along the axial direction of the outer knife tube between a window fully open position and a window fully closed position, and the linkage sleeve is partially arranged in the connecting channel; wherein, when the inner knife tube is at the window fully closed position, the linkage sleeve and the sliding sleeve are force-coordinated and one side of the sliding sleeve is limitedly cooperated with the first limiting portion; when the inner knife tube is at the window fully open position, the linkage sleeve and the sliding sleeve are non-force-coordinated and the other side of the sliding sleeve is limitedly cooperated with the second limiting portion.

5. The biopsy needle according to claim 4, characterized in that: The sliding sleeve is movably arranged in the middle cavity, the outer side wall of the linkage sleeve is provided with a second sealing portion, through which the linkage sleeve and the inner side wall of the rear cavity are sealed and matched, and an end surface channel extending in the radial direction is provided on one end of the linkage sleeve facing the sliding sleeve; When one side of the sliding sleeve is limitedly matched with the first limiting part, the gas channel and the end surface channel are adjacent to each other and connected; when the other side of the sliding sleeve is limitedly matched with the second limiting part, the gas channel and the end surface channel are separated.

6. The biopsy needle according to claim 4, characterized in that: The sliding sleeve includes a first sleeve body and a second sleeve body connected to each other, the first sleeve body is movably arranged in the middle cavity, the first sleeve body is provided with the gas channel, the outer wall of the first sleeve body is provided with the first sealing portion, the second sleeve body is arranged away from the tip relative to the first sleeve body, the outer wall of the second sleeve body is sealed with the inner wall of the rear cavity, and the inner wall of the second sleeve body is sealed with the outer wall of the inner knife tube; wherein, when the inner knife tube is in the window fully closed position, the linkage sleeve and the second sleeve body are force-coordinated and one side of the first sleeve body is limitedly cooperated with the first limiting portion; when the inner knife tube is in the window fully open position, the linkage sleeve and the second sleeve body are non-force-coordinated and the other side of the first sleeve body is limitedly cooperated with the second limiting portion.

7. The biopsy needle according to claim 6, characterized in that: The outer side wall of the second sleeve is provided with a third sealing portion, through which the second sleeve is sealed and matched with the inner side wall of the rear cavity; the inner side wall of the second sleeve is provided with a fourth sealing portion, through which the second sleeve is sealed and matched with the outer side wall of the inner knife tube.

8. The biopsy needle according to claim 4, characterized in that: The biopsy needle also includes an elastic reset member, one end of which is connected to the sliding sleeve, and the other end of which is connected to the limiting sleeve. The elastic reset member is constructed to be in a deformed state when the first sealing portion and the pressure relief port are arranged axially with an interval between them along the inner knife tube, so as to apply a reset force to the sliding sleeve and drive the sliding sleeve to move until the first sealing portion closes the pressure relief port.

9. The biopsy needle according to claim 8, characterized in that: The elastic reset member is arranged close to the tip relative to the sliding sleeve, and the single-side width of the front cavity matches the single-side width of the elastic reset member.

10. The biopsy needle according to any one of claims 1 to 9, characterized in that: The first sealing portion comprises a first sealing ring and a second sealing ring, the first sealing ring and the second sealing ring are both sleeved on the outer side wall of the sliding sleeve and spaced apart along the axial direction of the inner knife tube, and the first sealing ring and the second sealing ring are both sealed and matched with the inner side wall of the connecting channel; Wherein, when the inner knife tube is in the window fully closed position, the first sealing ring and the second sealing ring are both located on the side of the pressure relief port close to the tip; when the inner knife tube is in the window fully open position, the sliding sleeve moves so that the pressure relief port is located between the first sealing ring and the second sealing ring.

11. A biopsy device, characterized in that: include: A biopsy handle having a power source, wherein the power source is used to provide power for the movement of the inner knife tube; A biopsy needle, wherein the biopsy needle is the biopsy needle according to any one of claims 1 to 10, and the biopsy needle is arranged on the biopsy handle.

12. A biopsy system, characterized in that: include: A negative pressure source and a biopsy device as described in claim 11, wherein the negative pressure source is connected to the suction channel, and the negative pressure source is used to provide negative pressure in the suction channel.

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