Biopsy needle

Abstract

The biopsy needle comprises a needle assembly, a shell, an inner needle tube seat, an outer needle tube seat and a gear shifting mechanism, and the needle assembly comprises an inner needle tube and an outer needle tube; the shell is provided with an accommodating cavity; the inner needle tube seat is arranged in the accommodating cavity, the inner needle tube seat can move relative to the shell, and the inner needle tube seat is fixedly connected with the inner needle tube; the outer needle tube seat is arranged in the containing cavity and can move relative to the shell, the outer needle tube seat and the inner needle tube seat can move relative to each other, the outer needle tube seat is fixedly connected with the outer needle tube, and the inner needle tube is sleeved with the outer needle tube; the gear shifting mechanism is partially arranged in the shell, and the end part of the gear shifting mechanism is used for blocking the inner needle tube seat and the outer needle tube seat after sampling and percussion; wherein the gear shifting mechanism is provided with a plurality of adjustable gears, and at least two positions on the shell can display the gear which is being executed. The gear which is being executed in the gear shifting mechanism can be displayed at at least two positions on the shell, so that the risk of misoperation is reduced, and the use convenience and safety of the biopsy needle are improved.

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 existing technologies, a shifting mechanism is used to adjust the stroke of the inner and outer needle seats after firing, thereby controlling the sampling distance. However, in these technologies, there is only one adjustment button for adjusting the shifting mechanism's position. When preparing to fire, the user must check the current shifting mechanism's position by rotating the biopsy needle grip or turning their head to observe the adjustment button, causing inconvenience for the user before firing. Utility Model Content

[0004] Therefore, it is necessary to provide a biopsy needle that addresses the technical problem of inconvenient operation of confirming the position before firing the biopsy needle in related technologies.

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

[0006] A needle assembly, comprising an inner needle tube and an outer needle tube;

[0007] The shell has a receiving cavity;

[0008] An inner needle tube seat is disposed within the receiving cavity. The inner needle tube seat is movable relative to the housing and is fixedly connected to the inner needle tube.

[0009] An outer needle tube seat is disposed within the receiving cavity. The outer needle tube seat is movable relative to the housing. The outer needle tube seat and the inner needle tube seat are movable relative to each other. The outer needle tube seat is fixedly connected to the outer needle tube. The outer needle tube is sleeved on the inner needle tube.

[0010] A shifting mechanism is partially disposed within the housing, and the end of the shifting mechanism is used to block the inner needle tube seat and the outer needle tube seat after sampling and firing.

[0011] The shifting mechanism has multiple adjustable gears, and the currently active gear can be displayed at at least two positions on the housing.

[0012] In one embodiment, the housing has a button slot and a display window, the display window being located on the side where the firing button is located; the shifting mechanism includes:

[0013] A shift button is disposed in the button slot. The shift button is operablely movable relative to the button slot. The shift button is used to adjust the gear. The position of the shift button relative to the button slot can determine the currently executed gear. At the same time, the gear display window can display the gear information of the currently executed gear.

[0014] The firing button is used to unlock the inner needle holder and / or the outer needle holder for sampling firing.

[0015] In one embodiment, the gear shift component includes:

[0016] The shifting mechanism also includes a gear position component, which is disposed inside the housing and linked with the shifting button. The gear position component is used to abut against the inner needle tube seat and the outer needle tube seat.

[0017] The gear shift assembly is provided with a gear position indicator. The shift button moves the gear shift assembly relative to the housing. When the shift button is in any gear, the gear position indicator corresponding to the gear position of the shift button corresponds to the display window, thereby displaying the current gear position in the display window. In one embodiment, the biopsy needle includes:

[0018] The first latch is provided on the inner needle tube seat and / or the outer needle tube seat, and can engage with the housing when the inner needle tube seat and the outer needle tube seat are moved to the upper chamber position;

[0019] A firing button is slidably connected to the housing, and the firing button is operably connected to the first latch, for operably driving the first latch to disengage from the housing;

[0020] The surface of the first latch that abuts against the firing button is configured as an inclined surface, and the direction of movement of the firing button relative to the housing is perpendicular to the inclined surface on the first latch.

[0021] In one embodiment, the firing button includes:

[0022] The button body is movably disposed on the housing, and the button body is used to abut against the first buckle;

[0023] An elastic arm is fixedly connected at one end to the housing and at the other end to the button body. The elastic arm can be elastically deformed, and the button body can return to its initial position under the rebound force of the elastic arm.

[0024] In one embodiment, a button hole is provided on the housing at a position corresponding to the first buckle, and the firing button is disposed in the button hole, the wall of the button hole matching the outer peripheral surface of the button body;

[0025] The extension direction of the button hole is perpendicular to the inclined surface of the button body that abuts against the first buckle.

[0026] In one embodiment, the display window is located near the fire button. Furthermore, the display window is not obstructed when the fire button is pressed.

[0027] In one embodiment, the outer needle holder is provided with a limiting arm, and the inner needle holder is provided with a limiting protrusion. When the biopsy needle is fired for sampling, the inner needle holder is stopped. After the outer needle holder moves a preset distance relative to the inner needle holder, the limiting arm is stopped by the limiting protrusion to restrict the outer needle holder from retracting.

[0028] In one embodiment, the limiting protrusion is configured as a ratchet structure;

[0029] The limiting arm is elastically deformable and has a pawl structure;

[0030] During the firing sampling process, the inner needle tube seat stops firing. When the outer needle tube seat moves forward relative to the inner needle tube seat until it stops, the pawl structure can slide relative to the limiting protrusion and engage with the distal end of the limiting protrusion.

[0031] In one embodiment, the biopsy needle further includes a loading mechanism, the loading mechanism comprising:

[0032] A loaded trigger is rotatably connected to the housing;

[0033] A drive rod is movably disposed within the housing and is connected to the loading trigger. The rotation of the loading trigger drives the drive rod to move along the axis of the housing. A first stop is constructed on the drive rod, which is used to connect with the outer needle tube seat and / or the inner needle tube seat.

[0034] The housing is provided with a lifting step. When the rotation of the loading trigger drives the drive rod to move along the axis of the housing, the limiting arm is lifted by the lifting step to pass over the limiting protrusion and engage with the proximal side of the limiting protrusion.

[0035] The beneficial effects of this utility model are:

[0036] This invention provides a biopsy needle, wherein the needle assembly is used to cut and separate sample tissue within a sampling space to achieve the purpose of sampling. The housing is used to house the inner needle holder, outer needle holder, and other components, and also to fix the needle core so that the needle core remains stationary relative to the housing. Since the inner needle tube is sleeved on the needle core, the inner needle holder is used to fix the inner needle tube. The inner needle holder is placed within the receiving cavity and is movable relative to the housing, allowing the inner needle tube to move relative to the needle core, thereby filling the hollow area between the inner needle tube and the needle core with sample tissue. Since the outer needle tube is sleeved on the inner needle tube and fixedly connected to the outer needle holder, and the outer needle holder is movable relative to the housing, the outer needle holder and the inner needle holder can move relative to each other, allowing the outer needle tube to move relative to the needle core and the inner needle tube. This allows the elastic blade on the outer needle tube to pass through the slot on the inner needle tube and enter the interior of the inner needle tube, enabling the outer needle tube to cut the target tissue between the inner needle tube and the needle core. Alternatively, when the elastic blade is located on the inner needle tube and a slot is provided on the outer needle tube, the elastic blade on the inner needle tube can pass through one slot on the outer needle tube and then through another slot into the outer needle tube through relative movement between the inner and outer needle tubes and the housing. This allows the elastic blade on the inner needle tube to cut the target tissue between the inner and outer needle tubes. By incorporating a shifting mechanism, the end of the shifting mechanism abuts against the inner and outer needle tube seats after sampling and firing, thereby fixing the inner and outer needle tube seats relative to the housing. The shifting mechanism has multiple adjustable positions, allowing adjustment of the stroke of the inner and outer needle tube seats, and thus the sampling stroke of the needle assembly. In this application, the gear being engaged in the shifting mechanism can be displayed in at least two positions on the housing, so that when the user is ready to fire, there is no need to rotate the biopsy needle or turn the head to observe the adjustment button to confirm the gear of the shifting mechanism. The user can directly confirm the gear of the shifting mechanism through an easy-to-observe position, thereby reducing the risk of misoperation and improving the convenience and safety of using the biopsy needle. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the external structure of the shifting mechanism of the biopsy needle provided in one embodiment of the present invention when it is in position 1.

[0038] Figure 2 This is a schematic diagram of the external structure of the shifting mechanism of the biopsy needle in position 3 according to an embodiment of the present invention.

[0039] Figure 3 A schematic diagram of the internal structure of the shifting mechanism of a biopsy needle provided in an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the internal structure of a biopsy needle when the firing button is not unlocked from the first latch, according to an embodiment of the present invention.

[0041] Figure 5 A schematic diagram of the internal structure of a biopsy needle after the firing button of the biopsy needle is unlocked by the first latch, according to an embodiment of the present invention.

[0042] Figure 6 A schematic diagram of the internal structure of the biopsy needle provided in an embodiment of the present invention, showing the positional relationship between the firing button and the first latch.

[0043] Figure 7 This is a schematic diagram of the connection between the inner and outer needle tube seats and the drive rod of a biopsy needle according to an embodiment of the present invention.

[0044] Figure 8 This is a schematic diagram of the structure of the biopsy needle inner tube seat provided in an embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram of the connection between the inner and outer needle holders of a biopsy needle according to an embodiment of the present invention;

[0046] Figure 10 A schematic diagram of the internal structure of the biopsy needle's inner and outer needle holders, drive rod, and housing, provided in an embodiment of this utility model;

[0047] Figure 11 This is a schematic diagram of the structure of the biopsy needle assembly provided in one embodiment of the present invention;

[0048] Figure 12 This is a schematic diagram illustrating the force decomposition of the movement method for triggering a button in the prior art;

[0049] Figure 13 This is a force decomposition diagram illustrating the movement of the firing button in a biopsy needle according to an embodiment of the present invention.

[0050] Attached image labels:

[0051] Housing 100; button hole 110; display window 120; button slot 130; inner needle tube seat 200; limiting protrusion 210; outer needle tube seat 300; limiting arm 310; shifting mechanism 400; shifting button 410; gear assembly 420; first shifting component 421; gear mark 4211; rotary transmission mechanism 500; first buckle 600; firing button 700; button body 710; elastic arm 720; loading trigger 800; drive rod 900; needle assembly 1000; inner needle tube 1100; outer needle tube 1200; spring 1210; needle core 1300. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] See Figures 1 to 3 This utility model provides a biopsy needle, which includes a needle assembly, a housing 100, an inner needle tube seat 200, an outer needle tube seat 300, and a shifting mechanism 400. The needle assembly includes an inner needle tube and an outer needle tube; the housing 100 has a receiving cavity; the inner needle tube seat 200 is disposed in the receiving cavity and is movable relative to the housing 100, and is fixedly connected to the inner needle tube; the outer needle tube seat 300 is disposed in the receiving cavity and is movable relative to the housing 100. The outer needle tube seat 300 and the inner needle tube seat 200 are movable relative to the housing 100. The outer needle tube seat 300 is fixedly connected to the outer needle tube, which is sleeved on the inner needle tube. The shifting mechanism 400 is partially located inside the housing 100. The end of the shifting mechanism 400 is used to block the inner needle tube seat 200 and the outer needle tube seat 300 after sampling firing. The shifting mechanism 400 has multiple adjustable gears, and at least two positions on the housing 100 can display the currently executed gear.

[0059] This technical solution provides a biopsy needle, wherein the needle assembly is used to cut and separate sample tissue within the sampling space to achieve the purpose of sampling. The housing 100 is used to house the inner needle holder 200, the outer needle holder 300, and other components. The housing 100 also serves to fix the needle core, ensuring that the needle core remains stationary relative to the housing 100. Since the inner needle tube is sleeved on the needle core, the inner needle holder 200 is used to fix the inner needle tube. The inner needle holder 200 is disposed within the receiving cavity and is movable relative to the housing 100, allowing the inner needle tube to move relative to the needle core, thereby filling the hollow area between the inner needle tube and the needle core with sample tissue. Since the outer needle tube is sleeved on the inner needle tube and fixedly connected to the outer needle tube seat 300, and the outer needle tube seat 300 can move relative to the housing 100, the outer needle tube seat 300 and the inner needle tube seat 200 can move relative to each other. This allows the outer needle tube to move relative to the needle core and the inner needle tube, so that the elastic blade on the outer needle tube can pass through the slot on the inner needle tube and enter the interior of the inner needle tube, enabling the outer needle tube to cut the target tissue between the inner needle tube and the needle core. Alternatively, when the elastic blade is located on the inner needle tube and the outer needle tube has a slot, the relative movement between the inner needle tube, the outer needle tube, and the housing 100 allows the elastic blade on the inner needle tube to pass through one slot on the outer needle tube and then through another slot into the outer needle tube, enabling the elastic blade on the inner needle tube to cut the target tissue between the inner and outer needle tubes. By setting a shifting mechanism 400, the inner needle holder 200 and outer needle holder 300 after sampling firing are abutted by the end of the shifting mechanism 400, thereby fixing the inner needle holder 200 and outer needle holder 300 relative to the housing 100 after sampling firing. The shifting mechanism 400 has multiple adjustable positions, so that the stroke of the inner and outer needle holders 300 can be adjusted by adjusting the position of the shifting mechanism 400, thereby adjusting the sampling stroke of the needle assembly. In this application, the position currently being executed in the shifting mechanism 400 can be displayed in at least two positions on the housing 100, so that the user can confirm the position of the shifting mechanism 400 again, thereby reducing the risk of misoperation and improving the convenience and safety of biopsy needle use.

[0060] In this invention, for a biopsy needle, the proximal end refers to the end closer to the operator's operating end, and the distal end refers to the end farther from the operator's operating end. The distal ends of the needle core, inner needle tube, and outer needle tube refer to the ends farther from the operating end. Specifically, the inner needle tube seat 200 and the outer needle tube seat 300 are located within the receiving cavity of the housing 100 near the proximal end, and the rotary transmission mechanism 500 is located within the receiving cavity of the housing 100 near the distal end.

[0061] like Figures 1 to 3As shown, specifically, the housing 100 has a button slot 130 and a display window 120; the shifting mechanism 400 includes a shift button 410, which is disposed in the button slot 130. The shift button 410 can be operably moved relative to the button slot 130. The shift button 410 is used to adjust the gear, and the position of the shift button 410 relative to the button slot 130 can determine the currently executed gear; at the same time, the display window 120 can display the gear information of the currently executed gear.

[0062] A key slot 130 is provided on the housing 100 to house the shift button 410. The key slot 130 provides an operable channel for the shift button 410 to connect with the sampling stroke level adjustment component, and allows the shift button 410 to protrude from the housing 100 for easy user operation. The shift button 410 is configured to be operablely movable relative to the key slot 130 to adjust the sampling stroke level. The shift button determines the currently executed level, and the level information is displayed in a display window, allowing the user to confirm the shift mechanism's level, thereby reducing the risk of misoperation and improving the convenience and safety of using the biopsy needle.

[0063] The shifting mechanism 400 also includes a gear position component 420, which is located inside the housing 100 and is linked to the shift button 410. The gear position component 420 is used to block the inner needle tube seat 200 and the outer needle tube seat 300. The gear position component 420 is provided with a gear position mark 4211. The shift button 410 drives the gear position component 420 to move relative to the housing 100. When the shift button 410 is in any gear, the gear position mark corresponding to the gear position of the shift button corresponds to the display window 120, thereby displaying the current gear position in the display window 120.

[0064] The button slot 130 provides an operable channel for connecting the shift button 410 and the gear shift assembly 420. The shift button 410 is configured to be operablely movable relative to the button slot 130, so that the movement of the shift button 410 relative to the button slot 130 drives the gear shift assembly 420 to move relative to the housing 100, thereby adjusting the position of the gear shift assembly 420 relative to the housing 100. The gear shift assembly 420 is used to abut against the inner needle holder 200 and the outer needle holder 300. Thus, by adjusting the position of the gear shift assembly 420 relative to the housing 100 via the shift button 410, the travel distance of the inner needle holder 200 and the outer needle holder 300 can be adjusted, thereby achieving gear adjustment of the sampling distance. This allows the biopsy needle to be set with different sampling distances for different scenarios.

[0065] In this embodiment, by setting a gear position identifier 4211 on the gear position component 420, the gear position identifier 4211 corresponding to the currently executed gear on the gear position component 420 can be displayed in the display window 120, so that the user can confirm the currently executed gear from the display window 120. The position of the shift button 410 relative to the button slot 130 can also determine the currently executed gear. In this way, the currently executed gear can be determined twice by the shift button 410 and the display window 120, thereby preventing accidental operation.

[0066] Understandably, to facilitate confirmation of the position of the shift button 410 relative to the button slot 130, a marking indicating the gear position can be provided on the edge of the housing 100 corresponding to the button slot 130. The gear position marked on the button slot 130 corresponding to the shift button 410 corresponds to the gear position displayed on the display window 120. For example, when the shift button 410 is in gear 1 on the button slot 130, the gear position marking 4211 displayed on the display window 120 is 1; when the shift button 410 is in gear 3 on the button slot 130, the gear position marking 4211 displayed on the display window 120 is 3.

[0067] like Figures 1 to 3 In one embodiment, the gear shift assembly 420 includes a first shift member 421, which is movably disposed within the housing 100 and connected to the shift button 410. A gear position indicator 4211 is disposed on the side of the first shift member 421 corresponding to the display window 120. The end of the first shift member is used to abut against the inner needle tube seat 200 and the outer needle tube seat 300.

[0068] By connecting the first shift member 421 to the shift button 410, and by enabling the first shift member 421 to move relative to the housing 100, the first shift member 421 can be moved relative to the housing 100 by pushing the shift button 410 along the extension direction of the button groove 130.

[0069] In this embodiment, by setting the gear position indicator 4211 on the side of the first shift member 421 corresponding to the display window 120, the gear position displayed in the display window 120 corresponds to the gear position on the shift button 410 and the button slot 130 through the linkage between the first shift member 421 and the shift button 410.

[0070] like Figures 1 to 3In one embodiment, the biopsy needle includes a rotary transmission mechanism 500, which is disposed within the receiving cavity and operably rotatable relative to the housing 100. The rotary transmission mechanism 500 is connected to the inner needle holder 200 and the outer needle holder 300. After the biopsy needle completes sampling firing, the rotary transmission mechanism 500 drives the inner and outer needle holders to rotate synchronously. By providing the rotary transmission mechanism 500, which is rotatable relative to the housing 100, after the biopsy needle completes sampling firing, the rotary transmission mechanism 500 is controlled to cause the inner and outer needle holders 300 to rotate synchronously relative to the housing 100, thereby driving the inner and outer needles to rotate relative to the housing 100, thus achieving secondary cutting of the tissue. When the biopsy needle is equipped with a rotary transmission mechanism 500, the gear position assembly 420 includes a first gear shifter 421 and a second gear shifter rotatably connected to the first gear shifter 421. The first gear shifter 421 is movably disposed in the housing 100 and connected to the shift button 410. The gear position indicator 4211 is disposed on the side of the first gear shifter 421 corresponding to the display window 120. The second gear shifter is connected to the end of the first gear shifter facing the inner needle tube seat 200 and the outer needle tube seat 300. The end of the second gear shifter is used to abut against the inner needle tube seat 200 and the outer needle tube seat 300. When the inner needle tube seat 200 and the outer needle tube seat 300 rotate synchronously, the second gear shifter can rotate together with the inner needle tube seat 200 and the outer needle tube seat 300.

[0071] The second shifting member is connected to the first shifting member 421 so that the second shifting member abuts against the inner needle tube seat 200 and the outer needle tube seat 300. This prevents the inner needle tube seat 200 and the outer needle tube seat 300 from stopping in the direction of movement after sampling and firing. The shifting button 410 moves the first shifting member 421 relative to the housing 100, and the first shifting member 421 moves the second shifting member relative to the housing 100, thereby adjusting the position of the second shifting member relative to the housing and thus adjusting the travel of the inner needle tube seat 200 and the outer needle tube seat 300.

[0072] like Figures 1 to 3The biopsy needle further includes a first latch 600 and a firing button 700. The first latch 600 is disposed on the inner needle holder 200 and / or the outer needle holder 300. When the inner needle holder 200 and the outer needle holder 300 are moved to the loaded position, the first latch can engage with the housing 100. The firing button 700 is slidably connected to the housing 100 and is operably connected to the first latch 600 for operably driving the first latch 600 to disengage from the housing 100. The side of the first latch 600 that abuts with the firing button 700 is configured as a slope, and the side of the firing button 700 that abuts with the first latch 600 is also configured as a slope. The direction of movement of the firing button 700 relative to the housing 100 is perpendicular to the slope on the first latch 600. The firing button 700 is used to unlock the inner needle holder 200 and / or the outer needle holder 300 for sampling firing.

[0073] A first latch is provided on the inner and / or outer needle tube seats to lock the movement of the inner and outer needle tube seats relative to the housing 100 through mutual engagement of the first latch and the housing 100. A firing button 700 is movably connected to the housing 100 and operably connected to the first latch 600 to operably drive the first latch 600 to disengage from the housing 100. In this embodiment, the side of the first latch 600 that abuts against the firing button 700 is set as an inclined surface, and the direction of movement of the firing button 700 relative to the housing 100 is set perpendicular to the inclined surface on the first latch 600. This ensures that when the first latch 600 is unlocked by pressing the firing button 700, the force acting on the first latch 600 is the same as the force applied to the firing button 700, allowing the user to unlock the first latch 600 with relatively small pressing force. This improves the comfort of unlocking the sampling firing function.

[0074] Specifically, such as Figure 12 As shown, in the prior art, assuming the pressing force on the trigger button 700 is a vertically downward force F1, F1 is decomposed on the inclined surface of the first latch 600 into a force F1 downward along the inclined surface. 1X and the force F perpendicular to the inclined plane line 1Y The force that causes the first latch to move downwards at 600 degrees is at F. 1Y The downward force F after decomposition 1Y1 In this embodiment, as... Figure 13 As shown, the direction of movement of the firing button 700 is set to be perpendicular to the inclined plane of the first latch 600. For example, when a force F2 perpendicular to the inclined plane of the first latch 600 is applied to the firing button 700, the force that causes the first latch 600 to move downward is the vertical component F of F2. 2YTherefore, it can be concluded that the downward force required for the first latch 600 to move is the rated force, i.e., F. 1Y1 =F 2Y It is clear that F1 > F2. Therefore, compared to existing technologies, if the first latch 600 is to be disengaged from the housing 100, the firing button provided in this embodiment can be activated with less force. Thus, using the firing button to move along the inclined plane perpendicular to the first latch is more labor-saving.

[0075] like Figure 4 and Figure 5 In one embodiment, the trigger button 700 includes a button body 710 and an elastic arm 720. The button body 710 is movably disposed on the housing 100 and is used to abut against the first latch 600. One end of the elastic arm 720 is fixedly connected to the housing 100, and the other end is connected to the button body 710. The elastic arm 720 is elastically deformable, and the button body 710 can return to its initial position under the rebound force of the elastic arm 720.

[0076] By connecting the button body 710 to the housing 100 via the elastic arm 720, and by configuring the button body 710 to move relative to the housing 100, pressing the button body 710 drives the first latch 600 to disengage from the housing 100. Because the elastic arm 720 is elastically deformable, after pressing the button body 710 and unlocking the first latch 600, the button body 710 can return to its initial position under the rebound force of the elastic arm 720. Specifically, the elastic arm 720 is a thin-walled component. By connecting one end of the elastic arm 720 to the housing 100 and the other end to the button body 710, the button body 710 itself cannot elastically deform. When pressure is applied to the button body 710, the elastic deformation of the elastic arm 720 allows the button body 710 to move relative to the housing 100.

[0077] like Figure 4 and Figure 5 In one embodiment, a button hole 110 is provided on the housing 100 at a position corresponding to the first buckle 600, and a firing button 700 is disposed in the button hole 110. The wall of the button hole 110 matches the outer peripheral surface of the button body 710. The extending direction of the button hole 110 is perpendicular to the inclined surface of the button body 710 that abuts against the first buckle 600.

[0078] By configuring the wall of the button hole 110 to match the outer peripheral surface of the button body 710, the button hole 110 can move along the groove wall of the button hole 110 when pressure is applied to the button body 710. In other words, the groove wall of the button hole 110 guides the movement of the button body 710. In this embodiment, by setting the extension direction of the button hole 110 to be perpendicular to the inclined surface where the button body 710 abuts against the first latch 600, the button body 710 moves along the inclined surface perpendicular to the first latch 600 under the guidance of the groove wall of the button hole 110, thereby making it easier to unlock the first latch 600.

[0079] like Figure 4 and Figure 5 In one embodiment, the display window 120 is positioned close to the firing button 700, and the display window 120 is not obstructed when the firing button 700 is operated. By positioning the display window 120, which displays the shift indicator of the shift mechanism 400, close to the firing button 700, the user can more easily confirm the current gear when operating the firing button 700, thereby improving the ease of use of the biopsy needle. Furthermore, the display window remains unobstructed when the firing button is operated, allowing the operator to easily confirm the current gear.

[0080] like Figure 11 As shown, the needle assembly 1000 includes an inner needle tube 1100, an outer needle tube 1200, and a needle core 1300. The needle core 1300 is fixedly connected to the distal end of the housing 100. The inner needle tube 1100 is fixedly connected to the inner needle tube seat 200, and the outer needle tube 1200 is fixedly connected to the outer needle tube seat 300. The inner needle tube 1100 is sleeved on the needle core 1300, and the outer needle tube 1200 is sleeved on the inner needle tube seat 200. The needle core 1300, the inner needle tube 1100, and the outer needle tube 1200 are coaxially arranged.

[0081] The inner needle tube 1100 has a cutting edge structure at its distal end, which can cut human tissue. A slot is provided on the side wall of the inner needle tube 1100. The outer needle tube 1200 has a spring piece 1210 at its distal end. When the outer needle tube 1200 moves relative to the inner needle tube 1100 along the axis of the needle assembly 1000, the spring piece 1210 can pass through the slot on the inner needle tube 1100 and enter the interior of the inner needle tube 1100 to cut the tissue between the inner needle tube 1100 and the needle core 1300. In the prior art, after sampling and firing, the inner needle tube seat 200 is first stopped by the second shifting member, thus fixing the inner needle tube seat 200 relative to the housing 100. The outer needle tube seat 300 continues to move a preset distance towards the distal end of the housing 100 under the elastic force of the firing spring before being stopped by the second shifting member. At this time, the spring piece 1210 enters the slot of the inner needle tube 1100. However, after the outer needle tube seat 300 impacts the second shifting member, it easily retracts under the reaction force of the second shifting member, causing the spring piece to disengage from the slot. To solve this problem, an embodiment of this utility model provides the following structure:

[0082] In such Figures 6 to 9 In one embodiment, the outer needle holder 300 is provided with a limiting arm 310, and the inner needle holder 200 is provided with a limiting protrusion 210. When the biopsy needle is fired for sampling, the inner needle holder 200 is stopped. After the outer needle holder 300 moves a preset distance relative to the inner needle holder 200, the limiting arm 310 is stopped by the limiting protrusion 210 to restrict the outer needle holder 300 from retracting.

[0083] By setting a limiting arm 310 on the outer needle tube seat 300 and a limiting protrusion 210 on the inner needle tube seat 200, the limiting protrusion 210 stops the limiting arm 310, thereby limiting the retraction of the outer needle tube seat 300 relative to the inner needle tube seat 200 after sampling and firing, thus preventing the spring on the outer needle tube from falling out of the slot, thereby improving the reliability of sampling.

[0084] Specifically, the limiting protrusion 210 is constructed as a ratchet structure; the limiting arm 310 is elastically deformable and has a pawl structure; during the firing sampling process, when the inner needle tube seat stops firing and the outer needle tube seat advances relative to the inner needle tube seat until it stops, the pawl structure can slide relative to the limiting protrusion and engage with the distal side of the limiting protrusion 210.

[0085] The limiting protrusion 210 is designed with a ratchet structure and a pawl structure, ensuring that the limiting arm 310 can only pass over the limiting protrusion 210 in one direction under a small external force. This guarantees the reliability of the limiting protrusion 210 in limiting the limiting arm 310, and further ensures that the outer needle tube seat 300 cannot retract relative to the inner needle tube seat 200 without other external force intervention, thus preventing the spring on the outer needle tube from exiting the slot on the inner needle tube. The limiting arm 310 is designed to be elastically deformable, allowing it to elastically deform under external force, facilitating its passage over the limiting protrusion 210 to achieve the functions of loading and preventing the outer needle tube seat 300 from retracting. During firing and sampling, when the inner needle tube seat stops firing and the outer needle tube seat advances relative to the inner needle tube seat until it stops, the pawl structure can slide and engage with the distal end of the limiting protrusion. This design prevents the outer needle tube seat from retracting when it moves into place relative to the housing, thus ensuring that the spring on the outer needle tube cannot exit the slot on the inner needle tube.

[0086] In such Figures 6 to 9 In one embodiment, the biopsy needle further includes a loading mechanism, which includes a loading trigger 800 and a drive rod 900. The loading trigger 800 is rotatably connected to the housing 100. The drive rod 900 is movably disposed within the housing 100 and is connected to the loading trigger 800. The rotation of the loading trigger 800 drives the drive rod 900 to move along the axis of the housing 100. A first stop is provided on the drive rod 900, which is used to connect with the outer needle tube seat 300 and / or the inner needle tube seat 200. The housing 100 is provided with a lifting step. When the rotation of the loading trigger 800 drives the drive rod 900 to move along the axis of the housing 100, the limiting arm 310 is lifted by the lifting step to pass over the limiting protrusion 210 and engage with the proximal side of the limiting protrusion 210.

[0087] By setting a lifting step on the housing 100, the drive rod 900 is moved relative to the housing 100 by the loading trigger 800. The drive rod 900 drives the inner and outer needle tube seats 300 to move relative to the housing 100. During the movement of the inner and outer needle tube seats 300 relative to the housing 100, the limiting arm 310 on the outer needle tube seat 300 bounces upward relative to the limiting protrusion 210 under the action of the lifting step. Thus, during the movement of the outer needle tube seat 300 relative to the housing 100, it passes over the limiting protrusion 210 and gets stuck on the proximal side of the limiting protrusion 210.

[0088] Reference Figures 1 to 9 It is understood that the working principle of the biopsy needle provided by this utility model is as follows:

[0089] In use, first adjust the position of the first shift member 421 and the second shift member relative to the housing 100 using the shift button 410, and determine the preset gear by referring to the gear position markings on the shift slot and the gear position marking 4211 displayed on the display window 120 using the shift button 410. After adjusting the gear, pull the loading trigger 800, causing the drive lever 900 to move relative to the housing 100 under the action of the loading trigger 800. When the drive rod 900 moves relative to the housing 100, the limiting arm 310 of the outer needle tube seat 300 is raised relative to the limiting protrusion 210 by the lifting protrusion on the housing 100, so that the limiting arm 310 passes over the limiting protrusion 210 from the distal end side of the limiting protrusion 210. At this time, the drive rod 900 continues to move towards the proximal end of the housing 100. The distal end of the drive rod 900 contacts the end face of the outer needle tube seat 300 and drives the inner needle tube seat 200 to move together along the axial direction towards the proximal end of the housing 100. The buckle on the inner needle tube seat 200 is locked together with the housing 100, and the loading is completed.

[0090] By pressing the firing button, the latch on the inner needle tube seat 200 disengages from the housing 100. Under the force of the firing spring, the inner needle tube seat 200 first contacts the second shifting member on the gear adjustment mechanism, preventing the inner needle tube seat 200 from moving further. At this time, the outer needle tube seat 300 moves further due to inertia, causing the outer needle tube's spring to move further and enter the slot of the inner needle tube. At this time, the limiting arm 310 of the outer needle tube seat 300 slides from the proximal side of the limiting protrusion 210 relative to the limiting protrusion 210 to the distal side of the limiting protrusion 210. When the outer needle tube seat stops abutting against the second shifting member, it experiences a rebound motion. This rebound motion, due to the engagement between the limiting arm and the limiting protrusion, prevents the outer needle tube seat from moving towards the proximal end of the limiting protrusion relative to the inner needle tube seat, thereby limiting the reciprocating motion of the outer needle tube seat 300 caused by inertial impact. At this point, the firing and sampling process is complete.

[0091] 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.

[0092] 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: A needle assembly, comprising an inner needle tube and an outer needle tube; The shell has a receiving cavity; An inner needle tube seat is disposed within the receiving cavity. The inner needle tube seat is movable relative to the housing and is fixedly connected to the inner needle tube. An outer needle tube seat is disposed within the receiving cavity. The outer needle tube seat is movable relative to the housing. The outer needle tube seat and the inner needle tube seat are movable relative to each other. The outer needle tube seat is fixedly connected to the outer needle tube. The outer needle tube is sleeved on the inner needle tube. A shifting mechanism is partially disposed within the housing, and the end of the shifting mechanism is used to abut against the inner needle tube seat and the outer needle tube seat after sampling firing; wherein, the shifting mechanism has multiple adjustable gears, and at least two positions on the housing can display the currently executed gear.

2. The biopsy needle according to claim 1, characterized in that, The housing has a button slot and a display window, the display window being located on the side where the firing button is located; the shifting mechanism includes: A shift button is disposed within the button slot. The shift button is operablely movable relative to the button slot. The shift button is used to adjust the gear. The position of the shift button relative to the button slot determines the currently executed gear. Simultaneously, the display window can display the gear information of the currently executed gear.

3. The biopsy needle according to claim 2, characterized in that, The shifting mechanism also includes a gear position component, which is disposed inside the housing and linked with the shifting button. The gear position component is used to abut against the inner needle tube seat and the outer needle tube seat. The gear shift assembly is provided with a gear position indicator. The shift button drives the gear shift assembly to move relative to the housing. When the shift button is in any gear, the gear position indicator corresponding to the gear position of the shift button corresponds to the display window, thereby displaying the current gear position in the display window.

4. The biopsy needle according to claim 2, characterized in that, The biopsy needle includes: A first latch is provided on the inner needle tube seat and / or the outer needle tube seat. When the inner needle tube seat and the outer needle tube seat are moved to the upper chamber position, the first latch can engage with the housing. A firing button is slidably connected to the housing, and the firing button is operably connected to the first latch, for operably driving the first latch to disengage from the housing; Wherein, the surface of the first buckle that abuts against the firing button is configured as an inclined surface, and the direction of movement of the firing button relative to the housing is perpendicular to the inclined surface on the first buckle; The firing button is used to unlock the inner needle socket and / or the outer needle socket for sampling firing.

5. The biopsy needle according to claim 4, characterized in that, The firing button includes: The button body is movably disposed on the housing, and the button body is used to abut against the first buckle; An elastic arm is fixedly connected at one end to the housing and at the other end to the button body. The elastic arm can be elastically deformed, and the button body can return to its initial position under the rebound force of the elastic arm.

6. The biopsy needle according to claim 5, characterized in that, A button hole is provided on the housing at a position corresponding to the first buckle, and the firing button is located in the button hole. The wall of the button hole matches the outer peripheral surface of the button body. The extension direction of the button hole is perpendicular to the inclined surface of the first buckle.

7. The biopsy needle according to claim 4, characterized in that, The display window is located close to the firing button, and the display window is not obstructed when the firing button is operated.

8. The biopsy needle according to any one of claims 1-7, characterized in that, The outer needle holder is provided with a limiting arm, and the inner needle holder is provided with a limiting protrusion. When the biopsy needle is fired for sampling, the inner needle holder is stopped. After the outer needle holder moves a preset distance relative to the inner needle holder, the limiting arm is stopped by the limiting protrusion to restrict the outer needle holder from retracting.

9. The biopsy needle according to claim 8, characterized in that, The limiting protrusion is constructed as a ratchet structure; The limiting arm is elastically deformable and has a pawl structure; During the firing sampling process, the inner needle tube seat stops firing. When the outer needle tube seat advances relative to the inner needle tube seat until it stops, the pawl structure can slide relative to the limiting protrusion and engage with the distal end of the limiting protrusion.

10. The biopsy needle according to claim 9, characterized in that, The biopsy needle further includes a loading mechanism, the loading mechanism comprising: A loaded trigger is rotatably connected to the housing; A drive rod is movably disposed within the housing and is connected to the loading trigger. The rotation of the loading trigger drives the drive rod to move along the axis of the housing. A first stop is constructed on the drive rod, which is used to connect with the outer needle tube seat and / or the inner needle tube seat. The housing is provided with a lifting step. When the rotation of the loading trigger drives the drive rod to move along the axis of the housing, the limiting arm is lifted by the lifting step to pass over the limiting protrusion and engage with the proximal side of the limiting protrusion.

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