Biopsy device

Abstract

The present application is suitable for the technical field of medical devices, and provides a biopsy device. The biopsy device comprises a shell, a suction assembly and a needle sleeve adjusting structure. The suction assembly comprises a needle sleeve, the needle sleeve is arranged at the distal end of the shell, and the distal end of the needle sleeve protrudes from the distal end of the shell. The needle sleeve is arranged in the needle sleeve adjusting structure and can move relative to the needle sleeve adjusting structure. The needle sleeve adjusting structure is arranged in the shell, and at least part of the needle sleeve adjusting structure can move along the needle sleeve to adjust the distance between the distal end of the needle sleeve and the distal end of the needle sleeve adjusting structure. The biopsy device provided by the present application can adjust the distance between the distal end of the needle sleeve adjusting structure and the distal end of the needle sleeve according to the body structure of different patients, so that the distal end of the needle sleeve can reach the target tissue, and the differences in the body structure of different patients can be considered, and the flexibility is high.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, and particularly relates to a biopsy device. Background Technology

[0002] Biopsy devices are commonly used equipment for puncture biopsies. Traditional biopsy devices have a fixed length of needle sheath extending from the distal end of the housing. When dealing with patients with varying body structures or target tissues located in different parts of the body, the extended length of the needle sheath may be too short or too long, necessitating replacement with a suitable needle sheath, resulting in limited flexibility. Summary of the Invention

[0003] Therefore, it is necessary to provide a biopsy device that addresses the technical problem of poor flexibility in existing biopsy devices.

[0004] The biopsy device includes a housing, an aspiration assembly, and a needle sheath adjustment structure. The aspiration assembly includes a needle sheath that passes through the distal end of the housing and protrudes from the distal end of the housing.

[0005] The needle sheath passes through the needle sheath adjustment structure and is movable relative to the needle sheath adjustment structure. The needle sheath adjustment structure is located in the housing, and at least a portion of the needle sheath adjustment structure is movable along the needle sheath to adjust the distance between the distal end of the needle sheath and the distal end of the needle sheath adjustment structure.

[0006] The biopsy device provided by the present invention includes a needle sheath adjustment structure, a housing, and an aspiration assembly. The aspiration assembly includes a needle sheath. The needle sheath adjustment structure can adjust the distance between the distal end of the needle sheath adjustment structure and the distal end of the needle sheath according to different patients' body structures, so that the distal end of the needle sheath can reach the target tissue. It can take into account the differences in the body structures of different patients and has high flexibility. Attached Figure Description

[0007] Figure 1 This is a perspective view of a biopsy device provided in one embodiment of the present invention;

[0008] Figure 2 yes Figure 1 Exploded view of the biopsy device;

[0009] Figure 3 yes Figure 1 A vertical cross-sectional view of the biopsy device;

[0010] Figure 4 yes Figure 1 Perspective view of another embodiment of the needle sleeve adjustment structure;

[0011] Figure 5 yes Figure 4 Exploded view of the adjustment structure of the middle needle sleeve;

[0012] Figure 6 yes Figure 4 A vertical sectional view of the needle sleeve adjustment structure;

[0013] Figure 7 yes Figure 1 Perspective view of another embodiment of the needle sleeve adjustment structure;

[0014] Figure 8 yes Figure 7 Exploded view of the adjustment structure of the middle needle sleeve;

[0015] Figure 9 yes Figure 1 Perspective view of another embodiment of the needle sleeve adjustment structure;

[0016] Figure 10 yes Figure 9 Exploded view of the adjustment structure of the middle needle sleeve;

[0017] Figure 11 yes Figure 9 A vertical sectional view of the needle sleeve adjustment structure.

[0018] Figure 12 yes Figure 1 Perspective view of another embodiment of the needle tube adjustment structure;

[0019] Figure 13 yes Figure 12 A three-dimensional view of the first limiting component;

[0020] Figure 14 yes Figure 12 A vertical sectional view of the syringe adjustment structure;

[0021] Figure 15 yes Figure 1 Perspective view of another embodiment of the needle tube adjustment structure;

[0022] Figure 16 yes Figure 15 Exploded view of the needle tube adjustment structure;

[0023] Figure 17 yes Figure 15 A vertical sectional view of the syringe adjustment structure;

[0024] Figure 18 yes Figure 3 A partial enlarged view of another embodiment at point A.

[0025] Figure label:

[0026] 100. Biopsy device;

[0027] 10. Needle sleeve adjustment structure; 110. Moving parts;

[0028] 120. First limiting component; 121a. First rotating component; 122a. Clamping component; 123a. Guide component; 1231a. Guide hole; 121b. Axial pressing component; 1211b. Annular groove; 1212b. Outer ring wall; 1213b. Inner ring wall; 122b. Clamping component; 123b. Threaded structure; 121c. Fastening component; 1211c. Protrusion; 122c. Fastening part; 121d. Second rotating component; 122d. Threaded structure;

[0029] 130. Second scale;

[0030] 20. Needle tube adjustment structure;

[0031] 210. Needle tube pusher; 220. Needle tube drive; 230. Threaded structure; 240. Connector; 241. Threaded Luer structure; 242. Snap-fit ​​part;

[0032] 250. Second limiting component; 251a. Limiting element; 252a. Locking element; 251b. Limiting element; 252b. Holding element; 251c. Third rotating element; 2511c. First locking edge; 252c. Locking element;

[0033] 260. Second scale;

[0034] 30. Suction assembly; 310. Needle sheath; 315. Fixing block; 320. Needle tube; 330. Needle core; 40. Housing; 410. Half-shell; 420. Baffle; 430. Mating groove; 440. Notch; 450. Limiting groove; 460. Second retaining edge; 470. Mating part; 480. Step;

[0035] 50. Proximal locking element; 60. Distal locking element; 70. Positioning block; 80. Sensing element. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention 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 thorough understanding of the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0038] In the field of interventional medical devices, "distal" is defined as the end furthest from the operator during surgery, and "proximal" is defined as the end closest to the operator during surgery. "Axial" refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device, and "radial" refers to the direction perpendicular to the aforementioned axial direction.

[0039] like Figures 1 to 3 The image shows a biopsy device 1 provided in the first embodiment of the present invention. This biopsy device 1 is used to perform punctures within the human body to extract living tissue. Specifically, it is not limited to puncturing and extracting tissue from the liver, kidneys, lymph nodes, etc. In this embodiment, the puncture of a mediastinal lymph node using the biopsy device 1 is used as an example for explanation.

[0040] like Figure 1 and Figure 2 As shown, the biopsy device 1 includes a needle sheath adjustment structure 10, an aspiration assembly 30, and a housing 40. The aspiration assembly 30 includes a needle sheath 310. The needle sheath 310 may be hollow tubular and can be axially inserted into the housing 40. Specifically, in this embodiment, the needle sheath 310 is fixedly connected to the housing 40. The needle tube 320 may be hollow tubular and can be movably inserted into the needle sheath 310. The needle sheath 310 can be movably inserted into the needle sheath adjustment structure 10. At least a portion of the needle sheath adjustment structure 10 may be disposed within the housing 40. The needle sheath adjustment structure 10 can move axially along the housing 40. Since the needle sheath 310 is fixedly connected to the housing 40, the needle sheath 310 is inserted into the housing 40 and the needle sheath adjustment structure 10, and its distal end can extend from the distal end of the needle sheath adjustment structure 10. The distance from the distal end of the needle sheath 310 to the distal end of the needle sheath adjustment structure 10 can be adjusted by adjusting the length of the needle sheath adjustment structure 10 extending out of the housing 40, so as to take into account the differences in the physical structure of different patients.

[0041] The working principle of the biopsy device 1 is roughly as follows:

[0042] The lesion area of ​​the mediastinal lymph nodes is identified by ultrasound. The needle sheath 310 is inserted into the working channel of the endoscope. The biopsy device 100 is slowly advanced until the distal end of the needle sheath 310 connects with the working channel of the endoscope. The distance between the distal end of the needle sheath 310 and the distal end of the needle sheath adjustment structure 10 is adjusted to the target length by adjusting the needle sheath adjustment structure 10. At this point, the distal end of the needle sheath 310 can be slightly seen through the endoscope.

[0043] In summary, compared with existing technologies, the biopsy device 1 has at least the following beneficial effects:

[0044] The needle sheath adjustment structure 10 of the biopsy device 1 can adjust the distance between the distal end of the needle sheath adjustment structure 10 and the distal end of the needle sheath 310 according to different patients' body structures, so that the distal end of the needle sheath 310 can reach the target tissue. It can take into account the differences in the body structures of different patients and has high flexibility.

[0045] In this embodiment, as Figure 2 As shown, the housing 40 includes two symmetrically arranged half-shells 410. A distal locking member 60 is provided at the distal end of the housing 40, and a proximal locking member 50 is provided at the proximal end. Both the distal locking member 60 and the proximal locking member 50 can be annular in structure. The distal locking member 60 can be sleeved on the distal end of the housing 40 and screwed to the distal end of the housing 40 to fix the distal ends of the two half-shells 410. The proximal locking member 50 can be sleeved on the proximal end of the housing 40 and screwed to the proximal end of the housing 40 to fix the proximal ends of the two half-shells 410. The housing 40 is configured with the above-described detachable structure to facilitate the assembly of other components within the housing 40. Of course, the housing 40 can also be a one-piece molded structure.

[0046] In this embodiment, as Figures 1 to 3 As shown, the needle sleeve adjustment structure 10 includes a movable member 110. Specifically, in this embodiment, the movable member 110 can be a hollow tubular structure. Part of the needle sleeve 310 is located inside the housing 40, while another part of the needle sleeve 310 passes through the movable member 110 from the distal end of the housing 40 and extends out from the distal end of the movable member 110. The movable member 110 can move axially relative to the housing 40 to adjust the length by which the distal end of the needle sleeve 310 extends out of the distal end of the movable member 110, that is, to adjust the distance between the distal end of the needle sleeve 310 and the distal end of the movable member 110.

[0047] In this embodiment, as Figure 2 and Figure 3 As shown, the needle sleeve adjustment structure 10 also includes a first limiting component 120 to limit the stroke of the moving member 110 along the axial direction. The first limiting component 120 can prevent the distance between the distal end of the needle sleeve 310 and the distal end of the moving member 110 from changing due to the arbitrary movement of the moving member 110 along the axial direction, thus preventing malfunctions.

[0048] In this embodiment, as Figure 2 As shown, the movable member 110 may be provided with a first scale 130, which may be arranged along the axial direction. The first scale 130 can be used to display the distance between the distal end of the needle sheath 310 and the distal end of the movable member 110, so as to control the distance between the distal end of the needle tube 320 and the distal end of the movable member 110 according to the differences in the body structure of different patients.

[0049] In this embodiment, the value of the first scale 130 gradually decreases axially from the proximal end to the distal end. That is, as the moving member 110 moves axially from the proximal end to the distal end, the distance between the distal end of the needle sleeve 310 and the distal end of the moving member 110 gradually decreases. Furthermore, the measuring range of the first scale 130 can be 0-50mm.

[0050] In this embodiment, as Figures 1 to 3As shown, the first limiting component 120 includes a first rotating member 121a, a pressing member 122a, and a guide member 123a fixed inside the housing 40. Specifically, in this embodiment, the moving member 110 is movably disposed at the distal end of the housing 40. The first rotating member 121a may have an annular structure; the pressing member 122a includes a block structure; the guide member 123a has an annular structure and has a guide hole 1231a penetrating its inner and outer surfaces. A boss may be provided on the inner side of the first rotating member 121a. The first rotating member 121a is rotatably sleeved on the housing 40. The pressing member 122a can pass radially through the housing 40 and is disposed between the moving member 110 and the first rotating member 121a, and is movably received in the guide hole 1231a. That is, the movable member 110 passes through the guide member 123a, the guide member 123a passes through the first rotating member 121a, and the clamping member 122a is located between the first rotating member 121a and the guide member 123a. It can be understood that in other embodiments, the guide member 123a may also be integrally formed with the outer shell 40.

[0051] The first rotating member 121a rotates to cause the boss to press against the clamping member 122a, so that the clamping member 122a can radially press against the moving member 110, thereby restricting the axial movement of the moving member 110. The first rotating member 121a rotates to cause the boss to disengage from the clamping member 122a, so that the clamping member 122a can be released from the moving member 110, and the moving member 110 can continue to move axially.

[0052] In this embodiment, as Figure 2 As shown, the value displayed at the position where the first scale 130 on the movable part 110 overlaps with the far end of the housing 40 is the distance the movable part 110 has moved axially.

[0053] In this embodiment, as Figures 1 to 3 As shown, the biopsy device 100 also includes a needle adjustment structure 20, and the aspiration assembly 30 includes a needle 310. The needle adjustment structure 20 can be disposed in the housing 40 and is connected to the needle 320. The needle adjustment structure 20 can rotate to allow the distal end of the needle 320 to extend beyond the distal end of the needle sheath 310, so that the needle 320 can be smoothly and steadily inserted into the mediastinal lymph node. This reduces the requirements on the operator and also reduces the disadvantages of medical accidents caused by the bending and breakage of the needle 320, while simultaneously balancing the accuracy of needle insertion, the safety of operation, and work efficiency.

[0054] In this embodiment, as Figure 2As shown, the needle tube adjustment structure 20 includes a needle tube pusher 210 and a needle tube drive 220. Specifically, in this embodiment, the needle tube pusher 210 has a block-shaped structure, and the needle tube drive 220 has a hollow cylindrical structure. The needle tube pusher 210 can be located inside the needle tube drive 220. The needle tube pusher 210 can be rotatably connected to the needle tube drive 220. Specifically, the needle tube drive 220 rotates to drive the needle tube pusher 210 to move axially. Alternatively, while the needle tube pusher 210 rotates relative to the needle tube drive 220, the needle tube pusher 210 can also move axially. The needle tube 320 can be connected to the needle tube pusher 210. Specifically, in this embodiment, the proximal end of the needle tube 320 is fixedly connected to the needle tube pusher 210. The needle tube drive 220 rotates relative to the needle tube pusher 210 to allow the needle tube pusher 210 to move axially. The axial movement of the needle tube pusher 210 can drive the needle tube 320 to move axially. The needle pusher 210 moves axially toward the distal end, which allows the distal end of the needle tube 320 to extend beyond the distal end of the needle sheath 310, so that the needle tube 320 can be smoothly and steadily inserted into the mediastinal lymph node.

[0055] In this embodiment, as Figure 3 As shown, a threaded structure 230 may be provided between the needle tube pusher 210 and the needle tube drive 220. The needle tube pusher 210 and the needle tube drive 220 can be rotatably connected via the threaded structure 230. The threaded structure 230 includes an internal thread and an external thread adapted to the internal thread. The internal thread may be provided on the inner wall of the needle tube drive 220, and the external thread may be provided on the peripheral wall of the needle tube pusher 210. Alternatively, the internal thread may be provided on the peripheral wall of the needle tube pusher 210, and the external thread may be provided on the inner wall of the needle tube drive 220.

[0056] In this embodiment, as Figure 3 As shown, the needle drive 220 can be sleeved on the housing 40. In this case, the external thread can pass through the housing 40 radially and be screwed into the internal thread. Alternatively, both the needle drive 220 and the needle pusher 210 can be disposed inside the housing 40. In this case, the external thread and the internal thread can be directly screwed into each other.

[0057] In this embodiment, as Figure 2 As shown, a connector 240 may be fixedly provided at the proximal end of the needle pusher 210, and the connector 240 may be arranged axially. Part of the connector 240 is located within the needle drive 220. The connector 240 may move axially under the drive of the needle pusher 210. The distal end of the connector 240 may be screwed to the needle pusher 210, or it may be an integrally formed structure.

[0058] In this embodiment, as Figure 1 and Figure 2As shown, the aspiration assembly 30 also includes a needle core 330. The needle core 330 can be axially inserted through the connector 240, the needle tube pusher 210, and the needle tube 320, and fill the inner cavity of the needle tube 320. This is to prevent other non-target tissues from entering the needle tube 320 during the insertion of the aspiration assembly 30 into the human body, before it reaches the lesion area of ​​the mediastinal lymph node. After the needle tube 320 has entered the lesion area of ​​the mediastinal lymph node, the needle core 330 can be withdrawn from the needle tube 320.

[0059] In this embodiment, as Figure 2 As shown, the proximal end of connector 240 may have a threaded Luer structure 241 for screwing a syringe onto connector 240 to allow tissue from the lesion area of ​​the mediastinal lymph node to be extracted by the syringe.

[0060] In this embodiment, as Figure 2 and Figure 3 As shown, the needle adjustment structure 20 also includes a second limiting component 250 to limit the stroke of the needle drive 220 along the axial direction. The second limiting component 250 can prevent misoperation caused by the needle 320 moving arbitrarily along the axial direction.

[0061] In this embodiment, the needle drive 220 can move back and forth repeatedly within its stroke, so that the distal end of the needle 320 can repeatedly extend out of the needle sheath 310 to repeatedly puncture the mediastinal lymph nodes. Repeated puncture of the mediastinal lymph nodes can loosen the mediastinal lymph node tissue, making it easier to extract the mediastinal lymph node tissue.

[0062] In this embodiment, as Figures 1 to 3 As shown, the second limiting component 250 includes a limiting member 251a. Specifically, in this embodiment, the limiting member 251a can be annular. The needle drive 220 and the limiting member 251a can be sleeved on the housing 40, and the limiting member 251a can be located at the distal end of the needle drive 220. When the needle drive 220 moves axially from the proximal end to the distal end until the needle drive 220 abuts against the limiting member 251a, the limiting member 251a restricts the needle drive 220 from continuing to move distally. Since the axial movement of the needle drive 220 will drive the needle pusher 210 and the needle 320 fixed on the needle pusher 210 to move axially, the limiting member 251a can effectively prevent the needle 320 from puncturing the mediastinal lymph node too deeply. The limiting member 251a can move axially on the housing 40 to adjust the stroke of the needle drive member 220 along the axial direction, thereby adjusting the length of the distal end of the needle tube 320 extending beyond the distal end of the needle sheath 310. Furthermore, once the movable stroke of the needle drive member 220 is determined by the limiting member 251a, the needle drive member 220 can move repeatedly within that stroke.

[0063] In this embodiment, as Figure 2 and Figure 3As shown, the second limiting component 250 also includes a locking member 252a. Specifically, in this embodiment, the locking member 252a can be a screw or bolt, etc. The locking member 252a can pass through the limiting member 251a and be radially locked onto the housing 40 to restrict the axial movement of the limiting member 251a. The housing 40 may be provided with a mating groove 430 for the locking member 252a to be inserted, and the mating groove 430 may be axially arranged. The mating groove 430 can effectively prevent slippage on the surface of the housing 40 when the locking member 252a locks the housing 40.

[0064] Alternatively, the locking member 252a can pass through and lock the limiting member 251a. When the locking member 252a is released, the limiting member 251a also releases the housing 40, at which point the limiting member 251a can move axially on the housing 40. When the locking member 252a is locked, the limiting member 251a retracts to lock the housing 40, at which point the limiting member 251a is fixed on the housing 40.

[0065] In this embodiment, as Figure 1 and Figure 2 As shown, a second scale 260 may be provided on the housing 40, and may be arranged axially. The second scale 260 can be used to display the length of the distal end of the needle tube 320 extending from the distal end of the needle sheath 310, so as to adjust the depth to which the needle tube 320 can penetrate into the mediastinal lymph node according to the specific lesion area on the mediastinal lymph node. It can be understood that the value displayed at the position where the second scale 260 on the housing 40 overlaps with the proximal end of the limiting member 251a is the maximum length that the distal end of the needle tube 320 can extend from the distal end of the needle sheath 310. Based on this, when the needle tube drive member 220 moves axially to the point where the distal end of the needle tube drive member 220 abuts against the limiting member 251b, the length of the distal end of the needle tube 320 extending from the distal end of the needle sheath 310 is the maximum length that the distal end of the needle tube 320 can extend from the distal end of the needle sheath 310.

[0066] In this embodiment, the value of the second scale 260 gradually increases axially from the proximal end to the distal end. That is, as the needle drive 220 moves axially from the proximal end to the distal end, the length of the distal end of the needle tube 320 extending from the distal end of the needle sheath 310 gradually increases. Further, the measuring range of the second scale 260 can be 0-40 mm. In other embodiments, the measuring range of the second scale 260 can also be 0-60 mm or 0-80 mm. An appropriate measuring range can be selected according to the site of puncture and the depth of the mediastinal lymph node lesion.

[0067] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figures 4 to 6As shown, this embodiment differs from the first embodiment in that, in this embodiment, the first limiting component 120 includes an axial pressing member 121b (also called a first rotating member) and a clamping member 122b. Specifically, in this embodiment, the moving member 110 is movably disposed at the distal end of the housing 40. The clamping member 122b has an annular structure, specifically a rubber ring. The axial pressing member 121b has an annular structure, and its proximal end is provided with an annular groove 1211b with an opening facing the proximal end. The side of the axial pressing member 121b located radially outside the annular groove 1211b is an outer annular wall 1212b, and the side of the axial pressing member 121b located radially inside the annular groove 1211b is an inner annular wall 1213b, and the axial length of the inner annular wall 1213b is less than the axial length of the outer annular wall 1212b. A mating member 470 may be provided on the end face of the distal end of the housing 40, and this mating member 470 may have an annular structure. The mating part 470 can be inserted into the annular groove 1211b of the axial pressing part 121b, and the axial pressing part 121b can rotate relative to the mating part 470. The clamping part 122b can be sleeved on the moving part 110, and is located axially between the far end face of the housing 40 and the inner annular wall 1213b of the axial pressing part 121b, and radially between the moving part 110 and the mating part 470.

[0068] The axial pressing member 121b rotates relative to the mating member 470 to move axially near the distal end face of the mating member 470 on the housing 40, thereby reducing the axial gap between the groove bottom of the axial pressing member 121b and the mating member 470 to press the clamping member 122b. After being pressed, the clamping member 122b deforms radially to press the moving member 110, thereby restricting the axial movement of the moving member 110.

[0069] If the axial pressing member 121b rotates relative to the mating member 470 in the opposite direction, the axial clearance between the bottom of the groove of the axial pressing member 121b and the mating member 470 can be increased, thereby relieving the pressing force on the clamping member 122b. After the clamping member 122b is released from the force, its deformation recovers, thereby relieving the pressing force on the moving member 110, and the moving member 110 can continue to move axially.

[0070] In this embodiment, as Figure 6As shown, a threaded structure 123b may be provided between the outer annular wall 1212b of the axial pressing member 121b and the mating member 470. The outer annular wall 1212b of the axial pressing member 121b and the mating member 470 can be rotatably connected by the threaded structure 123b, so that the axial pressing member 121b can move axially while rotating. The threaded structure 123b includes an internal thread and an external thread adapted to the internal thread. The internal thread may be provided on the inner side of the outer annular wall 1212b of the axial pressing member 121b, and the external thread may be provided on the outer wall of the mating member 470. Alternatively, the internal thread may be provided on the outer wall of the mating member 470, and the external thread may be provided on the inner side of the outer annular wall 1212b of the axial pressing member 121b. It can be understood that if the housing 40 is assembled from two half-shells 410, then in this embodiment, the axial pressing member 121b simultaneously locks the distal ends of the two half-shells 410, thus replacing the distal locking member 60.

[0071] In this embodiment, as Figure 5 As shown, the value displayed at the position where the first scale 130 on the moving part 110 overlaps with the distal end of the axial pressing part 121b is the distance the moving part 110 moves axially.

[0072] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figure 7 and Figure 8 As shown, this embodiment differs from the first embodiment in that, in this embodiment, the first limiting component 120 includes a snap fastener 121c and a plurality of engaging portions 122c. Specifically, in this embodiment, the movable member 110 is movably sleeved on the distal end of the housing 40. The snap fastener 121c is axially disposed at the distal end of the housing 40 and has a protrusion 1211c on the radial side near the movable member 110. The distal end of the housing 40 may have a notch 440, and the snap fastener 121c may be located within the notch 440. The plurality of engaging portions 122c may be axially spaced on the movable member 110. The engaging portions 122c may be hole-like structures adapted to the protrusions 1211c of the snap fastener 121c. Further, the first limiting component 120 may be provided in two forms, that is, there may be two snap fasteners 121c and two rows of engaging portions 122c. Two snap fasteners 121c can be arranged radially opposite each other, and two rows of fastening parts 122c can be arranged corresponding to the two snap fasteners 121c. Each snap fastener 121c can cooperate with each fastening part 122c in a corresponding row to increase the stability of the moving part 110 and the housing 40 when they are fixed relative to each other.

[0073] The engagement of the latching member 121c with the engaging portion 122c restricts the axial movement of the movable member 110. When the latching member 121c disengages from the engaging portion 122c, the movable member 110 can move mechanically axially. By engaging the protrusion 1211c of the latching member 121c with the engaging portions 122c at various axial positions, the distance between the distal end of the movable member 110 and the distal end of the housing 40 is adjusted, thereby adjusting the distance between the distal end of the needle sleeve 310 and the distal end of the movable member 110.

[0074] In this embodiment, as Figure 8 As shown, the first scale 130 includes values ​​set on each fastening part 122c. The values ​​on the fastening parts 122c into which the snap fastener 121c is engaged represent different distances (i.e., different gears) of axial movement of the moving part 110.

[0075] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figures 9 to 11 As shown, this embodiment differs from the first embodiment in that, in this embodiment, the first limiting component 120 includes a second rotating member 121d. Specifically, in this embodiment, the moving member 110 is movably disposed at the distal end of the housing 40. The needle sleeve 310 is fixed to the housing 40 by a fixing block 315. The second rotating member 121d is disposed at the proximal end of the moving member 110 and is rotatably connected to the housing 40. When the second rotating member 121d is stationary relative to the housing 40, it can restrict the axial movement of the moving member 110. While rotating relative to the housing 40, the second rotating member 121d can move axially, and drive the moving member 110 to rotate and move axially, thereby adjusting the distance between the distal end of the moving member 110 and the distal end of the housing 40, and thus adjusting the distance between the distal end of the needle sleeve 310 and the distal end of the moving member 110.

[0076] In this embodiment, as Figure 11 As shown, a threaded structure 122d may be provided between the second rotating member 121d and the housing 40. The second rotating member 121d and the housing 40 can be rotatably connected by the threaded structure 122d, so that the second rotating member 121d can move axially while rotating. The threaded structure 122d includes an internal thread and an external thread adapted to the internal thread. The internal thread may be provided on the inner side of the housing 40, and the external thread may be provided on the peripheral wall of the second rotating member 121d. Alternatively, the internal thread may be provided on the peripheral wall of the second rotating member 121d, and the external thread may be provided on the inner side of the housing 40.

[0077] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figures 12 to 14As shown, this embodiment differs from the first embodiment in that, in this embodiment, the second limiting component 250 includes a limiting member 251b. Specifically, in this embodiment, the limiting member 251b can be a retaining ring. The needle drive 220 is sleeved on the housing 40. The limiting member 251b can be locked onto the housing 40, and its two ends respectively abut against the distal end of the proximal locking member 50 and the proximal end of the needle drive 220 to restrict the axial movement of the needle drive 220. When the limiting member 251b is removed from the housing 40, a space is opened on the housing 40 for the needle drive 220 to move axially, at which time the needle drive 220 can move repeatedly on the housing 40.

[0078] In this embodiment, as Figure 13 As shown, the second limiting component 250 also includes a holding member 252b disposed on the limiting member 251b to facilitate removing the limiting member 251b from the housing 40.

[0079] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figures 15 to 17 As shown, this embodiment differs from the first embodiment in that, in this embodiment, the second limiting component 250 includes a third rotating member 251c and a locking member 252c. The proximal end of the needle tube 320 is fixedly connected to the hollow connecting member 240. The needle core 330 passes through the connecting member 240, and the proximal end of the needle core 330 protrudes from the proximal end of the connecting member 240. The connecting member 240 passes through the third rotating member 251c and is axially movable relative to the third rotating member 251c. The needle tube drive member 220 is disposed within the housing 40. The third rotating member 251c is rotatably connected to the proximal end of the housing 40. The third rotating member 251c rotates relative to the housing 40 to drive the connecting member 240 to rotate, which in turn drives the needle tube pusher 210, which is screwed to the distal end of the connecting member 240, to rotate together, so that the needle tube pusher 210 and the needle tube drive member 220 are rotatably connected. Then, with the cooperation of the needle tube drive member 220, the needle tube pusher 210 and the connecting member 240 drive the needle tube 320 to rotate together while moving axially relative to the needle sleeve 310.

[0080] The outer casing 40 is provided with a limiting groove 450 along the axial direction. The locking member 252c can be provided on the needle drive member 220 and can pass through the limiting groove 450 and extend out of the outer casing 40. Moving the locking member 252c causes it to move repeatedly along the axial direction within the limiting groove 450, thereby driving the needle drive member 220 to move repeatedly along the axial direction, which in turn drives the needle tube 320 to repeatedly insert the needle.

[0081] Understandably, in other embodiments, the proximal end of the needle tube 320 may be fixed to the needle tube pusher 210, not limited to this embodiment, as long as the rotating third rotating member 251c can drive the needle tube 320 to rotate and insert the needle.

[0082] Understandably, such as Figure 17 As shown, if the housing 40 is assembled from two half-shells 410, then the third rotating member 251c in this embodiment simultaneously locks the proximal ends of both half-shells 410, thus replacing the proximal locking member 50.

[0083] In this embodiment, as Figure 16 As shown, a snap-fit ​​portion 242 extends radially from the outer wall of the connector 240. This snap-fit ​​portion 242 engages with the third rotating member 251c, so that when the third rotating member 251c rotates, it can drive the connector 240 to rotate and move axially relative to the third rotating member 251c. At least two snap-fit ​​portions 242 can be provided, and each snap-fit ​​portion 242 can be arranged at intervals along the circumference of the connector 240.

[0084] In this embodiment, as Figure 17 As shown, a step 480 is provided on the outer wall of the housing 40, and the step 480 may be located near the proximal end of the housing 40. The step 40 may be annular. A first retaining edge 2511c may be provided on the inner wall of the third rotating member 251c, and a second retaining edge 460 may be provided on the outer wall of the housing 40 near the proximal end. Both the first retaining edge 2511c and the second retaining edge 460 may be annular and mutually compatible. The distal end of the third rotating member 251c abuts against the step 480 of the housing 40, and the first retaining edge 2511c and the second retaining edge 460 abut against each other, thereby restricting the axial movement of the third rotating member 251c.

[0085] In other embodiments, the biopsy device 100 provided in this embodiment is basically the same as that in the first embodiment. For example... Figure 18 As shown, this embodiment differs from the first embodiment in that, in this embodiment, the biopsy device 100 further includes a sensor 80, which can be located within the housing 40 and disposed between the proximal end of the needle tube 320 and the needle tube pusher 210. During the process of the needle tube pusher 210 propelling the needle tube 320 towards the target tissue, the sensor 80 can detect the magnitude of the resistance experienced by the needle tube 320. Understandably, when the distal end of the needle tube 320 continuously applies progressively increasing pressure to the bronchial wall to prevent it from penetrating the mediastinal lymph node, the reaction force (i.e., resistance) experienced by the needle tube 320 will be applied to the sensor 80 and continuously increase until it exceeds a preset threshold, that is, the sensor 80 detects that the resistance experienced by the needle tube 320 exceeds the preset threshold. When the distal end of the needle 320 is inserted into the mediastinal lymph node, the sensing component 140 detects that the resistance experienced by the needle 320 is lower than a preset threshold. The reaction force experienced by the needle 320 is applied to the sensing element 80 and continuously decreases until it is lower than the preset threshold. That is, the sensing element 80 detects that the pressure experienced by the needle 320 is lower than the preset threshold.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biopsy device, characterized by: The biopsy device comprises a shell, a suction assembly and a needle sleeve adjusting structure, the suction assembly comprises a needle sleeve, the needle sleeve is arranged in the distal end of the shell, and the distal end of the needle sleeve protrudes from the distal end of the shell; The needle sleeve is arranged in the needle sleeve adjusting structure and is movable relative to the needle sleeve adjusting structure, the needle sleeve adjusting structure is arranged in the shell, and at least part of the needle sleeve adjusting structure is movable along the needle sleeve to adjust the distance between the distal end of the needle sleeve and the distal end of the needle sleeve adjusting structure; The needle sleeve adjusting structure comprises a moving piece, the moving piece is axially movable relative to the shell to adjust the distance between the distal end of the needle sleeve and the distal end of the moving piece; The needle sleeve adjusting structure further comprises a first limiting assembly for limiting the axial movement stroke of the moving piece, the first limiting assembly comprises a hollow first rotating piece, a pressing piece arranged in the first rotating piece and a guide piece fixedly arranged in the shell, the first rotating piece and the guide piece are annular structures, the guide piece has a guide hole penetrating through the inner and outer surfaces thereof, the inner side of the first rotating piece is provided with a boss, the first rotating piece is rotatably arranged in the shell, the pressing piece is radially movable through the shell, the first rotating piece is arranged outside the moving piece, the moving piece is arranged in the guide piece, the guide piece is arranged in the first rotating piece, the pressing piece is arranged between the first rotating piece and the moving piece and movably accommodated in the guide hole, and rotating the first rotating piece makes the boss press against the pressing piece so that the pressing piece abuts against the moving piece, thereby preventing the moving piece from axially moving.

2. The biopsy device of claim 1, wherein: A first scale is arranged on the moving piece to indicate the distance between the distal end of the needle sleeve and the distal end of the moving piece.

3. The biopsy device of claim 1, wherein: The biopsy device further comprises a needle tube adjusting structure, and the suction assembly further comprises a needle tube, the needle tube is movably arranged in the needle sleeve; The needle tube adjusting structure is arranged in the shell and connected with the needle tube, and the needle tube adjusting structure is rotatable to make the distal end of the needle tube extend out of the distal end of the needle sleeve.

4. The biopsy device of claim 3, wherein: The needle tube adjusting structure comprises a needle tube pushing piece and a needle tube driving piece rotatably connected with the needle tube pushing piece, the needle tube is connected with the needle tube pushing piece, and the needle tube driving piece is relatively rotatable with the needle tube pushing piece to make the distal end of the needle tube extend out of the distal end of the needle sleeve.

5. The biopsy device of claim 4, wherein: The biopsy device comprises a hollow third rotating piece and a hollow connecting piece arranged in the third rotating piece, the third rotating piece is sleeved on the proximal end of the shell and screwed on the proximal end of the shell, the needle tube pushing piece is connected with the hollow connecting piece, the third rotating piece is rotatable to drive the hollow connecting piece to rotate and axially move relative to the third rotating piece, thereby driving the needle tube pushing piece to rotate and drive the needle tube to rotate into the needle sleeve.

6. The biopsy device of claim 4, wherein: The needle tube adjusting structure further comprises a second limiting assembly for limiting the axial movement stroke of the needle tube driving piece.

7. The biopsy device of claim 6, wherein: The needle tube driving piece is repeatedly movable forward and backward within the stroke.

8. The biopsy device of claim 3, wherein: A second scale is arranged on the shell to indicate the length of the distal end of the needle tube extending from the distal end of the needle sleeve.

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