Needle biopsy device

Abstract

The invention discloses a needle biopsy device, which belongs to the technical field of biopsy, and comprises a needle core for needle biopsy; the inner needle tube is arranged on the periphery of the needle core; a circular channel allowing the needle core to penetrate through is formed in the side face of the fixed shell, the inner needle tube is fixedly connected with the fixed shell through a connecting piece, a first inserting part used for being connected with the needle core is arranged in an inner cavity of the fixed shell, and a connecting column is inserted into the first inserting part; a C-shaped plastic plate with toughness and elastic deformation functions is bonded to the side, away from the first inserting part, of the connecting column through glue, triangular protruding blocks integrally formed in an injection molding mode are connected to the two side faces, away from each other, of the plastic plate, and an extension spring is bonded between the vertical inner wall of the plastic plate and the vertical inner wall of the fixed shell; and two sliding rods are adhered to the vertical inner wall of the plastic plate. The needle biopsy device not only can carry out blocking protection, but also can carry out anti-impact protection.

Description

Technical Field

[0001] The invention belongs to the technical field of biopsy, in particular to a puncture biopsy device. Background Art

[0002] A biopsy needle is a medical device used for sampling living tissue and aspirating cells from cone tumors, unknown tumors, inflammatory pus, etc. in various organs such as the kidney, liver, lung, breast, thyroid, prostate, pancreas, testicles, uterus, ovaries, and body surface. In the actual use of biopsy needles, traditional biopsy needles have no blocking and limiting functions after use. If the inner needle tube bounces out due to unexpected circumstances, it will have a certain impact on the person being punctured, especially the unexpected activity of the tissue.

[0003] After searching, the Chinese patent document (authorization announcement number CN217162168U) discloses a tubular medical biopsy needle, including a shell, a left mounting frame and a right mounting frame are inserted into the inner side of the shell, the inner side of the left mounting frame and the right mounting frame are slidably connected with a travel frame, and the rear ends of the left mounting frame and the right mounting frame are slidably connected with a rear button. The present invention, by setting a left mounting frame, a right mounting frame, a tail cover, a rear button, a button spring, an inner tube frame, an outer tube frame, a middle tube frame, a string block and a sealing cover, can realize the adjustment function of the sampling amount through the cooperation of the stroke frame and the left mounting frame and the right mounting frame, realize the adjustment and locking function of the position of the middle tube frame and the outer tube frame through the cooperation of the string block, the sealing cover, the middle tube frame and the outer tube frame, realize the reset function between the middle tube frame and the outer tube frame through the rear button and the button spring, the main spring and the booster spring, and realize the reset function of the string block through the sealing cover, so that the sampling work of the biopsy needle is more flexible and reliable. The biopsy needle has no blocking and limiting functions after use. If it bounces out of the inner needle tube due to unexpected circumstances, it will have a certain impact on the person being punctured, especially unexpected tissue movement. Summary of the invention

[0004] The object of the present invention is to provide a puncture biopsy device to solve the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a puncture biopsy device, comprising:

[0006] Needle core, used for puncture biopsy;

[0007] An inner needle tube is arranged on the outer periphery of the needle core, and an outer needle tube is arranged on the outer periphery of the inner needle tube;

[0008] A fixed shell, a circular channel for the needle core to pass through is opened on the side of the fixed shell, the inner needle tube is connected and fixed to the fixed shell through a connecting piece, the inner cavity of the fixed shell is provided with a first plug-in portion for connecting with the needle core, and a connecting column is plugged into the first plug-in portion;

[0009] A C-shaped plastic plate with toughness and elastic deformation function is bonded to the side of the connecting column away from the first plug-in portion by glue, two mutually away side surfaces of the plastic plate are connected with integrally injection-molded triangular protrusions, a tension spring is bonded between the vertical inner wall of the plastic plate and the vertical inner wall of the fixed shell, and two sliding rods are bonded to the vertical inner wall of the plastic plate;

[0010] Two sliding tubes are arranged in the inner cavity of the fixed shell, and two connecting blocks are bonded to the inner bottom wall of the fixed shell. The top ends of the two connecting blocks are bonded and fixed to the outer periphery of the sliding tube by glue. The side of the sliding tube is connected to the limiting bucket. The outer periphery of the sliding rod is bonded with a hollow truncated cone block adapted to the limiting bucket, and the inner wall of the limiting bucket is bonded with a rubber pad with a buffering and anti-slipping function;

[0011] Two limit blocks are respectively embedded and installed on both sides of the fixed housing. The sides of the limit blocks are connected with a plurality of communication channels with gear functions. The communication channels are composed of circular channels and limit grooves adapted to the triangular protrusions.

[0012] Two pressing blocks are respectively arranged on both sides of the two limiting blocks, and a plurality of push rods inserted into the communication channels are bonded to the adjacent sides of the two pressing blocks, and the pressing blocks are connected and fixed to the limiting blocks through a second spring;

[0013] The two safety blocks are rotatably connected with the two limit blocks through the damping shaft. The side of the safety block is bonded with a magnet block for the limit pressing block. The side of the limit block is bonded with two iron blocks that are attracted to the magnet block.

[0014] As a preferred embodiment, two pushing blocks are provided on both sides of the fixed shell, movement channels for the pushing blocks to move are opened on both sides of the fixed shell, sliding channels connected to the pushing channels are opened on both sides of the fixed shell, and the pushing blocks are connected and fixed to the plastic plate through a connecting plate that passes through the sliding channels.

[0015] As a preferred embodiment, the outer circumference of the push block is provided with anti-slip grooves, and the outer circumference of the fixed shell is provided with gear position marks corresponding to the position of the push block.

[0016] As a preferred embodiment, the connecting member comprises:

[0017] The second plug-in portion is connected to the inner needle tube and has the same shape as the first plug-in portion;

[0018] The third plug-in portion is connected and fixed to the fixed shell.

[0019] As a preferred embodiment, the third plug-in portion is inserted into the second plug-in portion, and the first plug-in portion, the second plug-in portion and the third plug-in portion are all configured in a funnel shape.

[0020] As a preferred embodiment, the outer peripheries of the first plug-in portion, the second plug-in portion and the third plug-in portion are all provided with anti-slip grooves, and the outer periphery of the third plug-in portion is also bonded with a rubber sleeve for preventing slipping.

[0021] As a preferred embodiment, a movable cover is provided on the top of the fixed housing.

[0022] As a preferred embodiment, the movable cover is rotatably connected to the fixed shell via a hinge, and the movable cover is also connected and fixed to the fixed shell via a lock.

[0023] As a preferred embodiment, the two iron blocks are symmetrically arranged about the damping rotation axis, and the inner wall of the plastic plate is connected to a first spring in a compressed state.

[0024] As a preferred embodiment, a storage groove is provided on the outer periphery of the needle core, the length of the needle core is greater than the length of the inner needle tube, the outer diameter of the inner needle tube is the same as the inner diameter of the outer needle tube, the tube wall thickness of the inner needle tube is less than the tube wall thickness of the outer needle tube, a through hole is provided on the upper side of the inner needle tube, a connecting block is provided on the outer tube wall of the inner needle tube, one end of the connecting block is connected to the tube wall of the outer needle tube, and the other end is connected to a cutting piece, the cutting piece extends into the inner needle tube through the through hole, the lower end of the cutting piece is flush with the inner wall of the inner needle tube and the through hole opposite, a cutting tip is provided at the end of the inner needle tube away from the outer needle tube, the cutting tips are evenly arranged along the circumference of the inner needle tube, the number of the cutting tips is set to three, the upper end of the connecting block is flush with the upper end of the outer wall of the outer needle tube, the end of the cutting piece located in the inner needle tube is semicircular, and the diameter of the semicircle is the same as the inner diameter of the inner needle tube.

[0025] Compared with the prior art, the technical effects and advantages of the present invention are as follows:

[0026] The push block of the puncture biopsy device can drive the connection plate to move, thereby driving the plastic plate to move forward to different degrees, thereby realizing puncture biopsy requirements at different gears. Compared with the traditional single gear, it can adapt to different usage needs.

[0027] In the puncture biopsy device, the magnetic block can block the pressing block, which can avoid accidental contact with the pressing block, so that the push rod pushes the triangular protrusion to separate from the connecting channel. The attraction between the magnetic block and the iron block can ensure the stability of the magnetic block. When puncture biopsy is required, the safety block and the magnetic block are rotated to rotate the magnetic block to another iron block to release the obstruction to the pressing block.

[0028] The puncture biopsy device indirectly drives the push rod to push away the triangular protrusion by pressing the two pressing blocks with fingers, so that the triangular protrusion is separated from the connecting channel. Due to the restoring force of the tension spring, the plastic plate is driven to move. During the movement, the truncated cone block impacts into the limit bucket. At this time, the tension spring is still in a stretched state, and the inner wall of the limit bucket is bonded with a rubber pad with a buffering and anti-detachment function, which not only reduces the impact, but also reduces the rebound of the truncated cone block from the limit bucket, thereby ensuring the stability of the needle core.

[0029] The design of the movable cover of the puncture biopsy device facilitates opening and removing the first plug-in part, and the plug-in design of the connector also facilitates disassembly of the inner needle tube, thereby meeting different usage requirements.

[0030] The puncture biopsy device can not only provide blocking protection, but also provide anti-impact protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at center A;

[0033] Figure 3 A top view of the limit block and the pressing block of the present invention;

[0034] Figure 4 It is a cross-sectional view of the limit block and the push rod of the present invention;

[0035] Figure 5 A top view of the fixed housing of the present invention after removing the movable cover;

[0036] Figure 6 For the present invention Figure 5 Schematic diagram of the structure after the plastic plate is reset;

[0037] Figure 7 is a top view of the plastic plate of the present invention;

[0038] Figure 8 A top view of the plastic plate and the push block of the present invention;

[0039] Fig. 9 It is a structural schematic diagram of the sliding pipe and the limiting bucket of the present invention from another perspective;

[0040] Fig.10 It is a structural schematic diagram of the first plug-in portion of the present invention from another perspective;

[0041] Fig.11 It is a partial schematic diagram of the inner needle tube of the present invention;

[0042] Fig.12For the present invention Fig.11 Schematic diagram of the cutting state;

[0043] Fig.13 It is a partial top view of the inner needle tube of the present invention.

[0044] Description of reference numerals:

[0045] In the figure:

[0046] 1. Needle core; 2. Inner needle tube; 3. Fixed shell; 4. Connector; 5. First plug-in part; 6. Connecting column; 7. Plastic plate; 8. Triangular convex block; 9. Tension spring; 10. Slide rod; 11. Slide tube; 12. Connecting block; 13. Limiting bucket; 14. Round table block; 15. Rubber pad; 16. Limiting block; 17. Pressing block; 18. Push rod; 19. Safety block; 20. Magnetic block; 21. Iron block; 22. Pushing block; 23. Connecting plate; 24. Movable cover; 25. First spring; 26. Second spring; 27. Outer needle tube; 28. Connecting block; 29. ​​Cutting piece; 30. Cutting tip; 31. Through hole;

[0047] 41. Second plug-in connection portion; 42. Third plug-in connection portion. DETAILED DESCRIPTION

[0048] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0049] The connection method can be bonding, welding, bolt connection, etc., depending on actual needs.

[0050] See also Figures 1 to 13 , this embodiment includes:

[0051] Needle core 1, used for puncture biopsy;

[0052] The inner needle tube 2 is arranged on the outer periphery of the needle core 1, and an outer needle tube 27 is arranged on the outer periphery of the inner needle tube 2. The outer needle tube 27 can be connected to the fixed housing 3 through a connecting component, or can have other connection methods. A storage groove is arranged on the outer periphery of the needle core 1. The length of the needle core 1 is greater than the length of the inner needle tube 2. The size and shape of the inner needle tube 2 and the needle core 1 are not based on the figure, and are selected according to actual needs. When a puncture biopsy is required, after the operation of the external outer sleeve is completed, the inner needle tube 2 is inserted into the designated position inside the outer sleeve;

[0053] A fixed shell 3, a circular channel for the needle core 1 to pass through is opened on the side of the fixed shell 3, the inner needle tube 2 is connected and fixed to the fixed shell 3 through a connecting piece 4, and the inner cavity of the fixed shell 3 is provided with a first plug-in portion 5 for connecting with the needle core 1, and a connecting column 6 is inserted in the first plug-in portion 5;

[0054] A C-shaped plastic plate 7 with toughness and elastic deformation function, the inner wall of the plastic plate 7 is connected with a first spring 25 in a compressed state, which is glued to the side of the connecting column 6 away from the first plug-in portion 5 by glue, and the two mutually distant side surfaces of the plastic plate 7 are connected with an integral injection-molded triangular protrusion 8, and a tension spring 9 is glued between the vertical inner wall of the plastic plate 7 and the vertical inner wall of the fixed shell 3, and two sliding rods 10 are glued to the vertical inner wall of the plastic plate 7, which press the two pressing blocks 17 to indirectly drive the push rod 18 to push away the triangular protrusion 8, so that the triangular protrusion 8 is separated from the connecting channel, and due to the restoring force of the tension spring 9, the plastic plate 7 is driven to move, so that the needle core 1 moves relative to the inner needle tube 2;

[0055] Two sliding tubes 11 are arranged in the inner cavity of the fixed shell 3, and two connecting blocks 12 are bonded to the inner bottom wall of the fixed shell 3. The top ends of the two connecting blocks 12 are bonded and fixed to the outer periphery of the sliding tube 11 by glue. The side of the sliding tube 11 is connected to the limiting bucket 13, and the outer periphery of the sliding rod 10 is bonded with a hollow truncated cone block 14 adapted to the limiting bucket 13. The inner wall of the limiting bucket 13 is bonded with a rubber pad 15 with a buffering and anti-slipping function. During the movement, the truncated cone block 14 will impact into the limiting bucket 13. At this time, the tension spring 9 is still in a stretched state, and the inner wall of the limiting bucket 13 is bonded with a rubber pad 15 with a buffering and anti-slipping function, which not only reduces the impact, but also reduces the rebound of the truncated cone block 14 from the limiting bucket, thereby ensuring the stability of the needle core 1;

[0056] Two limit blocks 16 are respectively embedded on both sides of the fixed housing 3. The side of the limit block 16 is connected with a plurality of communication channels with a gear function. The communication channels are composed of a circular channel and a limit groove adapted to the triangular protrusion 8.

[0057] Two pressing blocks 17 are respectively arranged on both sides of the two limiting blocks 16. A plurality of push rods 18 inserted into the communication channels are bonded to the adjacent sides of the two pressing blocks 17. The pressing blocks 17 are connected and fixed to the limiting blocks 16 via the second springs 26.

[0058] The two safety blocks 19 are rotatably connected to the two limit blocks 16 respectively through the damping shaft. The side of the safety block 19 is bonded with a magnet block 20 for limiting the pressing block 17. The side of the limit block 16 is bonded with two iron blocks 21 that are attracted to the magnet block 20. The two iron blocks 21 are symmetrically arranged about the damping shaft. The magnet block 20 can block the pressing block 17 to avoid accidental touching of the pressing block 17 and ensure safety. The attraction of the magnet block 20 and the iron block 21 can ensure the stability of the magnet block 20. When needed, rotate the safety block 19 and the magnet block 20, rotate the magnet block 20 to the other iron block 21, and release the obstruction to the pressing block 17.

[0059] Two pushing blocks 22 are provided on both sides of the fixed shell 3, and movement channels for the pushing blocks 22 to move are provided on both sides of the fixed shell 3. Sliding channels connected to the pushing channels are provided on both sides of the fixed shell 3. The pushing blocks 22 are connected and fixed to the plastic plate 7 through connecting plates 23 that penetrate the sliding channels. Anti-slip grooves are provided on the periphery of the pushing blocks 22, and gear marks corresponding to the positions of the pushing blocks 22 are provided on the periphery of the fixed shell 3. When the pushing blocks 22 are moved by pressing two fingers, the pushing blocks 22 can drive the connecting plates 23 to move, thereby driving the plastic plate 7 forward, and driving the needle core 1 forward to different degrees, thereby realizing the puncture biopsy requirements of different gears.

[0060] The connecting member 4 comprises:

[0061] The second plug-in portion 41 is connected to the inner needle tube 2 and has the same shape as the first plug-in portion 5;

[0062] The third plug-in part 42 is connected and fixed to the fixed shell 3, and the third plug-in part 42 is inserted into the second plug-in part 41. The first plug-in part 5, the second plug-in part 41 and the third plug-in part 42 are all constructed in a funnel shape. The peripheries of the first plug-in part 5, the second plug-in part 41 and the third plug-in part 42 are all provided with anti-slip grooves. The periphery of the third plug-in part 42 is also adhered with a rubber sleeve for preventing falling off. Take out the entire device from the outer sleeve, remove the second plug-in part 41, and remove the biopsy item from the needle core 1.

[0063] A movable cover 24 is provided at the top of the fixed shell 3. The movable cover 24 is rotatably connected to the fixed shell 3 through a hinge. The movable cover 24 is also connected and fixed to the fixed shell 3 through a lock.

[0064] The outer diameter of the inner needle tube 2 is the same as the inner diameter of the outer needle tube 27. The wall thickness of the inner needle tube 2 is smaller than the wall thickness of the outer needle tube 27. A through hole 31 is provided on the upper side of the inner needle tube 2. A connecting block 28 is provided on the outer wall of the inner needle tube 2. One end of the connecting block 28 is connected to the wall of the outer needle tube 27, and the other end is connected to a cutting piece 29. The cutting piece 29 extends into the inner needle tube 2 through the through hole 31. The lower end of the cutting piece 29 is flush with the inner wall of the inner needle tube 2 and the through hole 31. A cutting tip 30 is provided at the end of the inner needle tube 2 away from the outer needle tube 27. The cutting tips 30 are evenly arranged along the circumference of the inner needle tube 2, and the number of the cutting tips 30 is set to three to achieve a better cutting effect on the affected area. The upper end of the connecting block 28 is flush with the upper end of the outer wall of the outer needle tube 27, that is, the thickness of the connecting block 28 is the difference between the tube walls of the inner needle tube 2 and the outer needle tube 27. The end of the cutting piece 29 located in the inner needle tube 2 is semicircular, and the diameter of the semicircle is the same as the inner diameter of the inner needle tube 2. When cutting, the cutting surface of the cutting piece 29 is circular, which can achieve complete cutting of the tissue in the inner needle tube 2. When in use, Fig.11 As shown, the needle core 1 extends out of the inner needle tube 2, and lifts the cut-off piece 29 in the inner needle tube 2. The cut-off piece 29 is almost attached to the inner wall of the inner needle tube 2. The biopsy needle relies on the end of the needle core 1 to penetrate into the human body and stays outside the tissue to be examined. The inner needle tube 2 continues to move forward along the axial direction of the needle core 1. During the forward movement, the cutting tip 30 cuts the tissue to be examined, and the inner needle tube 2 enters the tissue to be examined. At the same time, a part of the tissue to be examined enters the inner needle tube 2. When the through hole 4 moves to the end of the needle core 1, the cut-off piece 29 moves downward due to the elastic force, and can cut the tissue to be examined in the inner needle tube 2. Fig.12 As shown, the tissue to be examined is retained in the inner needle tube 2 .

[0065] How it works

[0066] The puncture biopsy device is moved by pressing the push block 22 with two fingers. The push block 22 can drive the connecting plate 23 to move, thereby driving the plastic plate 7 forward, and driving the needle core 1 forward to different degrees to achieve puncture biopsy requirements at different gears. The magnetic block 20 can block the pressing block 17, which can avoid accidental touching of the pressing block 17 and ensure safety. The attraction of the magnetic block 20 and the iron block 21 can ensure the stability of the magnetic block 20. When puncture biopsy is required, after the operation of the external outer sleeve is completed, the inner needle tube 2 is inserted into the specified position inside the outer sleeve, the safety block 19 and the magnetic block 20 are rotated, and the magnetic block 20 is rotated to the other iron block 21 to release the pressing block. 17 is blocked, and fingers press the two pressing blocks 17, which indirectly drives the push rod 18 to push away the triangular protrusion 8, so that the triangular protrusion 8 is separated from the connecting channel. Due to the restoring force of the stretching spring 9, the plastic plate 7 will be driven to move, so that the needle core 1 moves relative to the inner needle tube 2. During the movement, the truncated cone block 14 will impact into the limiting bucket 13. At this time, the stretching spring 9 is still in a stretched state, and the inner wall of the limiting bucket 13 is bonded with a rubber pad 15 with a buffering and anti-slip function, which not only reduces the impact, but also reduces the rebound of the truncated cone block 14 from the limiting bucket, thereby ensuring the stability of the needle core 1, and taking out the entire device from the outer sleeve, removing the second plug-in part 41, and taking away the biopsy item.

[0067] It should be noted that, in this document, relational terms such as one and two are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A puncture biopsy device, characterized in that: include: A needle core (1), used for puncture biopsy; An inner needle tube (2) is arranged on the outer periphery of the needle core (1), and an outer needle tube (27) is arranged on the outer periphery of the inner needle tube (2); A fixed shell (3), wherein a circular passage for the needle core (1) to pass through is provided on a side of the fixed shell (3), the inner needle tube (2) is connected and fixed to the fixed shell (3) via a connecting piece (4), and the inner cavity of the fixed shell (3) is provided with a first plug-in portion (5) for connecting to the needle core (1), and a connecting column (6) is inserted into the first plug-in portion (5); A C-shaped plastic plate (7) having toughness and elastic deformation function is bonded to the side of the connecting column (6) away from the first plug-in portion (5) by glue, and two mutually distant side surfaces of the plastic plate (7) are connected to integrally injection-molded triangular protrusions (8), a tension spring (9) is bonded between the vertical inner wall of the plastic plate (7) and the vertical inner wall of the fixed shell (3), and two sliding rods (10) are bonded to the vertical inner wall of the plastic plate (7); Two sliding tubes (11) are arranged in the inner cavity of the fixed shell (3); two connecting blocks (12) are bonded to the inner bottom wall of the fixed shell (3); the top ends of the two connecting blocks (12) are bonded and fixed to the outer periphery of the sliding tube (11) by glue; the side of the sliding tube (11) is connected to a limiting bucket (13); the outer periphery of the sliding rod (10) is bonded with a hollow truncated cone block (14) adapted to the limiting bucket (13); the inner wall of the limiting bucket (13) is bonded with a rubber pad (15) with a buffering and anti-slipping function; Two limit blocks (16) are respectively embedded and installed on both sides of the fixed housing (3); the side surfaces of the limit blocks (16) are connected with a plurality of communication channels with a gear function, and the communication channels are composed of a circular channel and a limit groove adapted to the triangular protrusion (8); Two pressing blocks (17) are respectively arranged on both sides of the two limiting blocks (16); adjacent sides of the two pressing blocks (17) are bonded with a plurality of push rods (18) inserted into the communication channels; the pressing blocks (17) are connected and fixed to the limiting blocks (16) via a second spring (26); Two safety blocks (19) are rotatably connected to two limit blocks (16) via damping shafts, and a magnet block (20) for limiting the pressing block (17) is bonded to the side of the safety block (19), and two iron blocks (21) for attracting the magnet block (20) are bonded to the side of the limit block (16).

2. A puncture biopsy device according to claim 1, characterized in that: Two pushing blocks (22) are arranged on both sides of the fixed shell (3), movement channels for the pushing blocks (22) to move are provided on both sides of the fixed shell (3), sliding channels connected to the pushing channels are provided on both sides of the fixed shell (3), and the pushing blocks (22) are connected and fixed to the plastic plate (7) via a connecting plate (23) penetrating the sliding channels.

3. A puncture biopsy device according to claim 2, characterized in that: The outer circumference of the pushing block (22) is provided with anti-slip grooves, and the outer circumference of the fixed housing (3) is provided with gear position marks corresponding to the position of the pushing block (22).

4. A puncture biopsy device according to claim 1, characterized in that: The connecting member (4) comprises: The second plug-in portion (41) is connected to the inner needle tube (2) and has the same shape as the first plug-in portion (5); The third plug-in portion (42) is connected and fixed to the fixed housing (3).

5. A puncture biopsy device according to claim 4, characterized in that: The third plug-in portion (42) is inserted into the second plug-in portion (41), and the first plug-in portion (5), the second plug-in portion (41) and the third plug-in portion (42) are all constructed in a funnel shape.

6. A puncture biopsy device according to claim 5, characterized in that: The outer peripheries of the first plug-in portion (5), the second plug-in portion (41) and the third plug-in portion (42) are all provided with anti-slip grooves, and the outer periphery of the third plug-in portion (42) is also bonded with a rubber sleeve for preventing slipping.

7. A puncture biopsy device according to claim 1, characterized in that: A movable cover (24) is provided at the top end of the fixed housing (3).

8. A puncture biopsy device according to claim 7, characterized in that: The movable cover (24) is rotatably connected to the fixed shell (3) via a hinge, and the movable cover (24) is also connected and fixed to the fixed shell (3) via a lock.

9. A puncture biopsy device according to claim 1, characterized in that: The two iron blocks (21) are symmetrically arranged about the damping rotation axis, and the inner wall of the plastic plate (7) is connected to a first spring (25) in a compressed state.

10. The puncture biopsy device according to claim 1, characterized in that: The outer periphery of the needle core (1) is provided with a storage groove, the length of the needle core (1) is greater than the length of the inner needle tube (2), the outer diameter of the inner needle tube (2) is the same as the inner diameter of the outer needle tube (27), the wall thickness of the inner needle tube (2) is less than the wall thickness of the outer needle tube (27), a through hole (31) is provided on the upper side of the inner needle tube (2), a connecting block (28) is provided on the outer wall of the inner needle tube (2), one end of the connecting block (28) is connected to the wall of the outer needle tube (27), and the other end is connected to a cutting piece (29), and the cutting piece (29) passes through the through hole (31) The cutting piece (29) extends into the inner needle tube (2), the lower end of the cutting piece (29) is flush with the inner wall of the inner needle tube (2) and the through hole (31) opposite to each other, the inner needle tube (2) is provided with a cutting tip (30) at one end away from the outer needle tube (27), the cutting tips (30) are evenly arranged along the circumference of the inner needle tube (2), the number of the cutting tips (30) is set to three, the upper end of the connecting block (28) is flush with the upper end of the outer wall of the outer needle tube (27), the end of the cutting piece (29) located in the inner needle tube (2) is semicircular, and the diameter of the semicircle is the same as the inner diameter of the inner needle tube (2).

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