A precisely controllable colorectal polyp biopsy mechanism

Abstract

The present invention discloses a precisely controllable colorectal polyp biopsy mechanism, which relates to the field of medical device technology and comprises a forceps body and a forceps head disposed on the forceps body and used to clamp polyp samples. The forceps body is also provided with a puncture needle and a drive assembly, and the puncture needle is located between the two forceps heads. The drive assembly has a first stroke for driving the puncture needle to puncture and limit the position of the sample and a second stroke for driving the forceps head to clamp the sample. The present invention provides a precisely controllable colorectal polyp biopsy mechanism, which can drive the puncture needle to puncture the polyp sample to be clamped through the first stroke of the drive assembly. The tip of the puncture needle can ignore the mucosa on the surface of the polyp to puncture and limit the position of the polyp sample. Subsequently, the second stroke of the drive assembly can drive the forceps head to clamp the polyp sample, thereby minimizing the slippage of the polyp sample during clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a colorectal polyp biopsy mechanism that can be precisely controlled. Background Art

[0002] Colorectal polyps are mucosal lesions protruding in the colon. They are usually benign. To determine the nature of the polyps and make a correct diagnosis, doctors usually perform colonoscopy and, if necessary, biopsy (tissue examination). The biopsy process involves collecting polyp tissue samples and sending them to a laboratory for cell or histological analysis to determine whether there is canceration or other pathological changes.

[0003] For example, in a patent document with the authorization announcement number CN214342433U, the authorization announcement date of October 8, 2021, and the name "A Medical Biopsy Forceps", it includes an outer tube and an operating handle and a biopsy forceps body respectively arranged at both ends of the outer tube. The outer tube mainly includes a steel cable and a lubricating tube sleeved on the outer surface of the steel cable. One end of the steel cable is connected to the biopsy forceps body, and the other end is connected to the operating handle and can drive the biopsy forceps body to open and close under the drive of the operating handle.

[0004] In the existing biopsy mechanisms, the polyp samples are generally clamped by the forceps body. Since the mucosal structure on the surface of the polyps is relatively lubricated, the forceps body may slip during the process of clamping the polyp samples, which will affect the efficiency of the biopsy mechanism in clamping the polyp samples. Summary of the Invention

[0005] The purpose of the present invention is to provide a colorectal polyp biopsy mechanism that can be precisely controlled to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A colorectal polyp biopsy mechanism that can be precisely controlled, including a forceps body and a forceps head arranged on the forceps body and used for clamping polyp samples. The forceps body is further provided with:

[0008] A puncture needle, which is located between the two forceps heads;

[0009] A driving component, which has a first stroke for driving the puncture needle to puncture and restricting the position of the sample and a second stroke for driving the forceps head to clamp the sample.

[0010] In the above-mentioned colorectal polyp biopsy mechanism that can be precisely controlled, there are two puncture needles. Both of the two puncture needles are hinged to the forceps body, and a first elastic member for forcing the distal ends of the two puncture needles to move away from each other is arranged in the forceps body.

[0011] The above-mentioned colorectal polyp biopsy mechanism that can be precisely controlled, the driving component includes a connecting shaft arranged in the clamp body, the driving shaft is fixed to the distal end of the connecting shaft, the proximal end of the driving shaft is constructed with a frustum, and the proximal end of the puncture needle is fixed with an inclined rod.

[0012] In the above-mentioned precisely controllable colorectal polyp biopsy mechanism, a rotating shaft is fixed on the clamp body, the clamp heads are rotatably connected to the rotating shaft, and a second elastic member is provided between the two clamp heads.

[0013] The above-mentioned colorectal polyp biopsy mechanism that can be precisely controlled, the driving assembly also includes a driving block slidably connected to the clamp body, the driving block is hinged with a driving rod, the driving rod is hinged to the clamp head, and the driving block is constructed with a slot that is engaged with the frustum.

[0014] In the aforementioned precisely controllable colorectal polyp biopsy mechanism, when the truncated cone portion is engaged with the slot, the outer wall of the drive shaft contacts the oblique rod.

[0015] The above-mentioned precisely controllable colorectal polyp biopsy mechanism further includes a locking component, which locks the relative position of the connecting shaft and the clamp body after the clamp head clamps the polyp sample.

[0016] The above-mentioned precisely controllable colorectal polyp biopsy mechanism, the locking assembly includes a locking block arranged in the clamp body, the outer wall of the connecting shaft is constructed with a cross-section portion, and the clamp body is provided with a third elastic member for forcing the locking block to approach the connecting shaft.

[0017] In the above-mentioned precisely controllable colorectal polyp biopsy mechanism, two arc-shaped plates are slidably connected in the clamp body, and both of the arc-shaped plates are constructed with extension parts.

[0018] In the above-mentioned precisely controllable colorectal polyp biopsy mechanism, the two puncture needles are hinged on two arc-shaped plates respectively.

[0019] In the above technical solution, the present invention provides a precisely controllable colorectal polyp biopsy mechanism, which can drive the puncture needle to puncture the polyp sample to be clamped through the first stroke of the driving component. The tip of the puncture needle can ignore the mucosa on the surface of the polyp to puncture and limit the position of the polyp sample. Then, the second stroke of the driving component can drive the forceps head to clamp the polyp sample, so as to minimize the slippage of the polyp sample during clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the clamp structure provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure inside the movable tank provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of a drive block provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the engagement structure between the truncated table portion and the card slot provided in an embodiment of the present invention;

[0026] Figure 6 The embodiment of the present invention provides Figure 5 A in the middle is an enlarged structural diagram;

[0027] Figure 7 A schematic diagram of the sleeve and arc-shaped plate structure provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the curved plate structure provided by an embodiment of the present invention;

[0029] Figure 9 A schematic diagram of the connection ring structure provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Clamp body; 2. Clamp head; 3. Puncture needle; 4. First elastic member; 5. Connecting shaft; 6. Drive shaft; 7. Cone portion; 8. Inclined rod; 9. Outer tube; 10. Handle; 11. Movable groove; 12. Rotating shaft; 13. Second elastic member; 14. Connecting portion; 15. Drive block; 16. Drive rod; 17. Slot; 18. Locking block; 19. Cross-section portion; 20. Third elastic member; 21. Connecting block; 22. Sleeve; 23. Protrusion; 24. Adapter groove; 25. Arc plate; 26. Slide groove; 27. Extension portion; 28. Limiting groove; 29. Connecting ring; 30. Slide plate. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] In the embodiments provided by the present invention, proximal end and distal end are professional terms in the medical field. For various endoscopes and other catheters and guidewire-type medical devices that need to enter the human body, "proximal end" and "distal end" refer to the relative orientation, relative position, and direction of components or actions relative to each other from the perspective of a doctor using the medical device. The proximal end refers to the end closest to the doctor, and the distal end refers to the end farthest from the doctor. This standard is followed in all embodiments of the present invention.

[0034] Reference Figures 1-9 An embodiment of the present invention provides a precisely controllable colorectal polyp biopsy mechanism, comprising a forceps body 1 and a forceps head 2 arranged on the forceps body 1 and used to clamp polyp samples. The forceps body 1 is also provided with a puncture needle 3 and a drive assembly, and the puncture needle 3 is located between the two forceps heads 2; the drive assembly has a first stroke for driving the puncture needle 3 to puncture and limit the sample position and a second stroke for driving the forceps head 2 to clamp the sample.

[0035] Specifically, colorectal polyps are protruding mucosal lesions in the colon. In order to determine the nature of the polyps and make a correct diagnosis, doctors usually perform colorectal examinations and, when necessary, perform biopsies. For the biopsy of polyps, biopsy forceps are usually used to clamp (clamp, cut and remove) the polyp tissue sample to send it to the laboratory for cell or histological analysis. The innovation of the embodiment of the present invention is that a puncture needle 3 and a drive assembly are provided on the clamp body 1. The puncture needle 3 is located between the two clamp heads 2. One or more of the puncture needles 3 can be provided. The distal end of the puncture needle 3 is relatively sharp. The distal end of the puncture needle 3 can ignore the mucosa on the surface of the polyp (that is, the puncture needle 3 will not slip due to the mucosa on the surface of the polyp) to puncture and limit the position of the polyp tissue sample. The drive assembly can use two sets of steel wire rope structures in the prior art. One set of steel wire rope structures is connected to the puncture needle 3 to control the puncture needle 3 to puncture the polyp sample. This is the first stroke of the drive assembly. The other set of steel wire rope structures is connected to the clamp head 2 to control The forceps head 2 clamps the polyp sample, which is the second stroke of the driving component; in this way, the puncture needle 3 can be driven by the first stroke of the driving component to limit the position of the polyp tissue sample to be clamped between the two forceps heads 2, and then the forceps head 2 can be driven by the second stroke of the driving component to stably clamp the restricted polyp tissue sample (the edge of the forceps head 2 is constructed as a knife edge, and the polyp tissue sample can be clamped and cut when the two forceps heads 2 are in contact with each other, and then the forceps body 1 can be moved to remove the forceps head 2 and the removed polyp tissue sample), so as to avoid slipping of the polyp sample and improve the efficiency of the biopsy mechanism in clamping the polyp sample as much as possible.

[0036] An embodiment of the present invention provides a precisely controllable colorectal polyp biopsy mechanism, which can drive the puncture needle 3 to puncture the polyp sample to be clamped through the first stroke of the driving component. The end of the puncture needle 3 can ignore the mucosa on the surface of the polyp to puncture and limit the position of the polyp sample. Then, the second stroke of the driving component can drive the forceps head 2 to clamp the polyp sample, so as to minimize the slippage of the polyp sample during clamping.

[0037] It should be noted that the two pliers heads 2 are each configured with a groove adapted to the puncture needle 3 on one side thereof, so that the two pliers heads 2 will not interfere with the puncture needle 3 when they are fitted together (e.g. Figure 3 and Figure 4 As shown), try to avoid the puncture needle 3 affecting the fit of the two clamp heads 2.

[0038] In another embodiment of the present invention, further, two puncture needles 3 are provided, both of the two puncture needles 3 are hinged to the clamp body 1, and a first elastic member 4 for forcing the distal ends of the two puncture needles 3 to move away from each other is provided in the clamp body 1. Specifically, the two puncture needles 3 are symmetrically arranged on the clamp body 1 and the distal ends of the two puncture needles 3 are constructed in a hook shape, so that the distal ends of the two puncture needles 3 can puncture and limit the polyp sample when they approach each other; the first elastic member 4 can choose a spring or elastic sheet structure in the prior art to force the distal ends of the two puncture needles 3 to move away from each other through the first elastic member 4; when it is necessary to limit the position of the polyp sample, the distal ends of the two puncture needles 3 are forced to overcome the elastic force of the first elastic member 4 and approach each other through the first stroke of the driving assembly to puncture and limit the polyp sample. The first stroke of the driving assembly can choose a combination of a steel wire rope and a resistance block, so that the resistance block is controlled by the steel wire rope to resist or release the resistance of the two puncture needles 3, so that the two puncture needles 3 are opened under the action of the first elastic member 4, or overcome the elastic force of the first elastic member 4 under the action of the resistance block to puncture the polyp sample.

[0039] Preferably, the driving assembly includes a connecting shaft 5 disposed in the forceps body 1. A driving shaft 6 is fixed to the distal end of the connecting shaft 5. A frustum portion 7 is formed at the proximal end of the driving shaft 6. An inclined rod 8 is fixed to the proximal end of the puncture needle 3. Specifically, the forceps body 1 generally cooperates with structures such as an outer tube 9 and a handle 10. The two ends of the outer tube 9 are respectively and limit-connected to the forceps body 1 and the handle 10. The connecting shaft 5 can be a wire rope structure in the prior art. One end thereof is located in the forceps body 1, and the other end passes through the outer tube 9 and extends to the handle 10 to control structures such as the forceps head 2 in the forceps body 1 through the operating structure at the handle 10. This is the prior art and will not be elaborated here. An activity groove 11 is formed in the forceps body 1 along its axis. The connecting shaft 5 is movably disposed in the activity groove 11. One end of the driving shaft 6 close to the connecting shaft 5 is formed as a frustum portion 7. The diameter of the frustum portion 7 at the end close to the connecting shaft 5 is smaller, and the other end is smoothly connected to the driving shaft 6. Inclined rods 8 are fixed to the proximal ends of both puncture needles 3. The end of the inclined rod 8 away from the puncture needle 3 is closer to the connecting shaft 5. Under the action of the first elastic member 4, the distal ends of the two puncture needles 3 are away from each other, and the proximal ends of the two puncture needles 3 are close to each other, so that the proximal ends of the two inclined rods 8 are close to each other and remain at a position close to the connecting shaft 5. At this time, the distance between the proximal ends of the two inclined rods 8 is greater than the diameter of the connecting shaft 5 and less than the diameter of the driving shaft 6. When it is necessary to limit the position of the polyp sample, pulling the connecting shaft 5 proximally can drive the driving shaft 6 to move proximally. At the same time, the outer wall of the frustum portion 7 abuts against the proximal ends of the two inclined rods 8 to force the proximal ends of the two inclined rods 8 to move away from each other, thereby driving the two puncture needles 3 to rotate synchronously and in opposite directions, and further enabling the distal ends of the two puncture needles 3 to overcome the elastic force of the first elastic member 4 and approach each other, so as to puncture and limit the polyp sample through the distal ends of the puncture needles 3 and make the polyp sample stably located between the two forceps heads 2, facilitating the forceps heads 2 to directly clamp the polyp sample during operation.

[0040] Furthermore, a rotating shaft 12 is fixed to the forceps body 1. The forceps head 2 is rotatably connected to the rotating shaft 12. A second elastic member 13 is disposed between the two forceps heads 2. Specifically, a connecting portion 14 is formed at the proximal end of the forceps head 2. The two connecting portions 14 are respectively rotatably connected to both sides of the rotating shaft 12. The second elastic member 13 can be a spring or an elastic sheet structure in the prior art to force the two forceps heads 2 to move away from each other through the second elastic member 13. On the same side of the forceps body 1, the connecting portion 14 and the puncture needle 3 are arranged in a staggered manner, and there will be no interference when the puncture needle 3 rotates or the connecting portion 14 rotates. The second stroke of the driving assembly can be a connecting rod structure disposed between the two connecting portions 14 and the connecting shaft 5 to drive the two connecting portions 14 to rotate through the connecting rod structure when the user pulls the connecting shaft 5 proximally, thereby driving the two forceps heads 2 to perform clamping and cutting operations on the polyp sample. In this way, the first stroke and the second stroke can be synchronously operated by pulling the connecting shaft 5 proximally to drive the puncture needle 3 and the forceps heads 2 to operate synchronously, and further stably clamp the polyp sample.

[0041] As an alternative to the above-mentioned connecting rod structure, preferably, the driving assembly also includes a driving block 15 slidably connected to the pliers body 1, and a driving rod 16 is hinged on the driving block 15. The driving rod 16 is hinged to the pliers head 2, and the driving block 15 is constructed with a slot 17 that is engaged with the frustum portion 7. Specifically, the driving block 15 is slidably connected in the movable groove 11, and the two opposite sides of the driving block 15 are hinged with driving rods 16, and the two driving rods 16 are respectively hinged to the two connecting parts 14, and the driving rods 16 and the clamp head 2 are respectively on both sides of the rotating shaft 12; the inner wall of the clamping groove 17 is constructed as an inclined surface, and when the connecting shaft 5 and the driving shaft 6 move toward the proximal end, the frustum 7 can be clamped through the clamping groove 17, so that when the connecting shaft 5 continues to move toward the proximal end, it can drive the driving block 15 to move synchronously along the movable groove 11; when the driving block 15 moves toward the proximal end along the movable groove 11, the two driving rods 16 can drive the two connecting parts 14 to rotate synchronously and in opposite directions around the rotating shaft 12, so that the two connecting parts 14 drive the two clamp heads 2 to overcome the elastic force of the second elastic member 13 and approach each other, thereby clamping and cutting the polyp sample; the advantage is that When the user pulls the connecting shaft 5 toward the proximal end, the interference between the conical portion 7 and the driving shaft 6 and the oblique rod 8 can first force the two puncture needles 3 to puncture and restrict the polyp sample (this is the first stroke of the driving component). After the puncture needle 3 completes the restriction of the polyp sample, the conical portion 7 moves to the position of the card slot 17. At this time, continuing to pull the connecting shaft 5 toward the proximal end can drive the driving block 15 to move synchronously, thereby driving the two clamp heads 2 to approach each other through the driving rod 16 structure to clamp the polyp sample (this is the second stroke of the driving component). In this way, the first stroke and the second stroke of the driving component can be run successively when the connecting shaft 5 is pulled toward the proximal end, and the clamp head 2 will not start to run until the puncture needle 3 completes the restriction of the polyp sample, so as to stably clamp the polyp sample and try to avoid slippage between the polyp sample and the clamp head 2.

[0042] It should be noted that when the truncated cone 7 is engaged with the engaging groove 17, the outer wall of the drive shaft 6 contacts the oblique rod 8. Specifically, when the truncated cone 7 is moved to the engaging groove 17, the outer wall of the drive shaft 6 contacts the proximal end of the oblique rod 8. When the connecting shaft 5 is further pulled proximally, the outer wall of the drive shaft 6 can continue to contact the proximal end of the oblique rod 8. In this way, the puncture needle 3 can maintain its restriction on the polyp sample, and the two puncture needles 3 can be prevented from moving away from each other under the action of the first elastic member 4, thereby preventing the polyp sample from being lost when the forceps head 2 is in operation.

[0043] In still another embodiment provided by the present invention, further, a locking assembly is further included. After the jaw 2 clamps the polyp sample, the locking assembly locks the relative positions of the connecting shaft 5 and the forceps body 1. Specifically, after pulling the connecting shaft 5 proximally to complete the clamping and cutting of the polyp sample by the jaw 2, the user needs to remove the forceps body 1 from the patient's body. In the above embodiment, the user needs to continuously pull the connecting shaft 5 to maintain the positions of the driving block 15 and the inclined rod 8. Obviously, this method is not convenient enough, and the user is likely to loosen the connecting shaft 5, resulting in the polyp sample detaching from the jaw 2. Therefore, a locking assembly is provided to lock the relative positions of the connecting shaft 5 and the forceps body 1 after the jaw 2 clamps the polyp sample. The locking assembly can be an automatic locking structure arranged in the movable groove 11 to automatically lock the connecting shaft 5 when the connecting shaft 5 moves to a specific position in the movable groove 11; preferably, the locking assembly includes a locking block 18 arranged in the forceps body 1, a broken surface portion 19 is formed on the outer wall of the connecting shaft 5, and a third elastic member 20 for forcing the locking block 18 to approach the connecting shaft 5 is arranged in the forceps body 1. The locking block 18 is located on the side of the driving block 15 away from the jaw 2; the third elastic member 20 can be a spring or an elastic sheet structure in the prior art to force the locking block 18 to approach the connecting shaft 5 through the third elastic member 20; the connecting shaft 5 as a whole has two parts with different diameters. Taking the broken surface portion 19 as the boundary, the diameter of the proximal side of the broken surface portion 19 is larger than that of the distal side. Under the action of the third elastic member 20, the locking block 18 abuts against the outer wall of the larger-diameter part of the connecting shaft 5 (the friction between the locking block 18 and the outer wall of the connecting shaft 5 can be ignored and does not affect the operation of the forceps body 1 structure). During the process of pulling the connecting shaft 5 proximally to force the two jaws 2 to approach each other, the broken surface portion 19 moves proximally and approaches the locking block 18. When the connecting shaft 5 and the driving block 15 move to the end of their strokes, the jaw 2 completes the clamping and cutting of the polyp sample. At this time, the positions of the locking block 18 and the broken surface portion 19 correspond, so that the locking block 18 can abut against the outer wall of the smaller-diameter part of the connecting shaft 5 under the action of the third elastic member 20 to lock the relative positions of the connecting shaft 5 and the forceps body 1 through the locking block 18 and the broken surface portion 19, and to prevent the connecting shaft 5 from moving distally relative to the forceps body 1 as much as possible, and to prevent the jaw 2 from loosening as much as possible. The advantage is that when pulling the connecting shaft 5 proximally, the connecting shaft 5 can drive the puncture needle 3 and the jaw 2 to operate successively to limit and clamp the polyp sample, and when the jaw 2 completes the clamping of the polyp sample, the locking block 18 is passively abutted against the broken surface portion 19 to passively lock the relative positions of the connecting shaft 5 and the forceps body 1, saving the step of the user continuously pulling the connecting shaft 5 during the process of removing the forceps body 1.

[0044] It should be noted that the locking block 18 extends to the outside of the clamp body 1 at one end away from the connecting shaft 5 and is fixed with a connecting block 21. When the locking block 18 contacts the cross-section portion 19, the connecting block 21 fits against the outer wall of the clamp body 1. After the clamp body 1 is removed, the connecting block 21 is pushed outward to drive the locking block 18 to move away from the cross-section portion 19, thereby releasing the restriction on the connecting shaft 5, so that the connecting shaft 5 can move distally to release the restriction on the polyp sample, and then remove the polyp sample from the clamp head 2 and the puncture needle 3 for cell or histological analysis.

[0045] In the above embodiment, the two clamping jaws 2 move away from each other under the action of the second elastic member 13. To avoid damage to other tissues of the human body by the clamping jaws 2 and the puncture needle 3, the user needs to pull the connecting shaft 5 to force the two clamping jaws 2 to approach each other (if a locking assembly is provided in the forceps body 1, attention should be paid to the position of the connecting shaft 5 when pulling the connecting shaft 5, and try to avoid the operation of the locking assembly when moving the clamping jaws 2). Until the forceps body 1 moves to the position of the polyp sample, then push the connecting shaft 5 distally to open the clamping jaws 2 and the puncture needle 3, and then perform the clamping operation on the polyp sample; Obviously, during the process of moving the forceps body 1 to the position of the polyp sample, it is inconvenient to continuously pull the connecting shaft 5. Preferably, two arc-shaped plates 25 are slidably connected in the forceps body 1, and extension portions 27 are formed on both of the two arc-shaped plates 25.Specifically, a sleeve 22 is rotatably connected to the rotating shaft 12. The sleeve 22 is arranged radially along the rotating shaft 12. A convex portion 23 is fixed to the inner wall of the sleeve 22. An adaptation groove 24 adapted to the convex portion 23 is formed on the outer wall of the driving shaft 6. Arc-shaped plates 25 are slidably connected to opposite sides inside the pliers body 1. Slide grooves 26 are formed on opposite sides of the movable groove 11. The slide grooves 26 are arranged axially along the sleeve 22. Slide plates 30 are formed on both arc-shaped plates 25. The two slide plates 30 are respectively slidably connected in the two slide grooves 26. The two arc-shaped plates 25 are both threadedly connected to the sleeve 22 (a mutually adapted thread structure is provided between the inner walls of the two arc-shaped plates 25 and the outer wall of the sleeve 22). Extension portions 27 are formed on both arc-shaped plates 25. The ends of the two extension portions 27 away from the arc-shaped plates 25 respectively extend to the outside of the two connecting portions 14. Limit grooves 28 are formed on the outside of the two connecting portions 14. When the two pliers heads 2 are in contact with each other, the two arc-shaped plates 25 move to the distal ends of the slide grooves 26 to drive the two extension portions 27 to limit the positions of the two connecting portions 14. When the connecting shaft 5 drives the driving shaft 6 to rotate, the sleeve 22 rotates synchronously with the driving shaft 6. Since the outer wall of the sleeve 22 is threadedly connected to the inner wall of the arc-shaped plate 25, the sleeve 22 can drive the two arc-shaped plates 25 to slide synchronously along the slide grooves 26 when rotating (the arc-shaped plates 25 slide in the slide grooves 26 through the slide plates 30). In this embodiment, when the pliers body 1 is not operating, the connecting shaft 5 is at the end close to the pliers head 2, and the driving shaft 6 is located inside the sleeve 22. At this time, the two extension portions 27 are respectively located in the two limit grooves 28, so as to force the two pliers heads 2 to overcome the elastic force of the second elastic member 13 and be in a closed state. After the pliers body 1 moves to the position of the polyp sample, the driving shaft 6 can be driven to rotate by rotating the connecting shaft 5, so that the sleeve 22 is driven to rotate by the driving shaft 6. The rotation of the sleeve 22 can drive the two arc-shaped plates 25 to slide synchronously along the slide grooves 26, so that the arc-shaped plates 25 drive the extension portions 27 to move proximally along the slide grooves 26 until the extension portions 27 move out of the limit grooves 28. The two connecting portions 14 can rotate around the rotating shaft 12 without the restriction of the extension portions 27, so that the two pliers heads 2 can move away from each other under the action of the second elastic member 13, thereby opening the two pliers heads 2 to perform subsequent operations of restricting and clamping the polyp sample when pulling the connecting shaft 5 successively. The advantage is that when the pliers body 1 is idle or has not moved to the position of the polyp sample, the two pliers heads 2 can be forced to close through the extension portions 27, which is convenient for moving the pliers body 1 to the position of the polyp sample. Then, rotating the connecting shaft 5 can release the restriction on the pliers heads 2, so that the two pliers heads 2 can be opened under the action of the second elastic member 13. That is, in this embodiment, different functions can be achieved by rotating and pulling the connecting shaft 5 proximally. Rotating the connecting shaft 5 can drive the extension portion 27 to release the restriction on the pliers heads 2, and pulling the connecting shaft 5 can achieve the clamping of the polyp sample. In this way, multiple functions can be integrated onto a single connecting shaft 5, which is convenient for the user to operate.

[0046] Preferably, the two puncture needles 3 are respectively hinged on two arc-shaped plates 25 (or extension parts 27). Specifically, in this embodiment, the rotating connection shaft 5 can not only drive the extension part 27 to release the restriction on the connection part 14, but also drive the puncture needle 3 to move proximally. In this way, the position of the puncture needle 3 can be adjusted after the restriction on the forceps head 2 is released. The advantage is that if the volume of the polyp sample to be clamped is large, the connection shaft 5 can be rotated to move the puncture needle 3 proximally, and then the polyp sample can be restricted at the position in the middle of the forceps head 2 through the puncture needle 3 to clamp the polyp sample with a large volume. If the volume of the polyp sample to be clamped is small, after rotating the connection shaft 5 to release the restriction on the forceps head 2, the connection shaft 5 can be directly pulled to restrict the polyp sample at the distal end of the forceps head 2 through the puncture needle 3, and then the polyp sample with a small volume can be clamped.

[0047] It should be noted that in the prior art, the operation structure at the handle 10 can control the pushing, pulling or rotation of the connection shaft 5 in the forceps body 1. As Figure 9 shown, the proximal end of the connection shaft 5 extends to the handle 10 and is fixed with a connection ring 29. Through the connection ring 29, the connection shaft 5 can be controlled to move proximally or distally in the forceps body 1, and the connection shaft 5 can also be controlled to rotate in the forceps body 1 through the connection ring 29.

[0048] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A precisely controllable colorectal polyp biopsy mechanism, comprising a forceps body and a forceps head arranged on the forceps body and used for clamping polyp samples, characterized in that, The clamp body is also provided with: The puncture needle is located between the two clamp heads; A driving assembly having a first stroke for driving the puncture needle to puncture and limit the position of the sample and a second stroke for driving the clamp to clamp the sample; Two puncture needles are provided, and a first elastic member is provided in the clamp body for forcing the distal ends of the two puncture needles to move away from each other; The driving assembly includes a connecting shaft arranged in the clamp body, the distal end of the connecting shaft is fixed with a driving shaft, the proximal end of the driving shaft is structured with a truncated cone portion, and the proximal end of the puncture needle is fixed with an oblique rod; A rotating shaft is fixed on the pliers body, the pliers heads are rotatably connected to the rotating shaft, and a second elastic member is provided between the two pliers heads; The driving assembly also includes a driving block slidably connected to the pliers body, a driving rod hinged on the driving block, the driving rod is hinged to the pliers head, and a clamping groove is constructed on the driving block to be clamped with the frustum portion; Two arc plates are slidably connected in the caliper body, and both arc plates are constructed with extensions, a sleeve is rotatably connected to the rotating shaft, a protrusion is fixed on the inner wall of the sleeve, and an adapting groove adapted to the protrusion is constructed on the outer wall of the driving shaft, and arc plates are slidably connected on opposite sides of the caliper body, and the two arc plates are threadedly connected to the sleeve, and the two extensions extend away from one end of the arc plates to the outside of the two connecting parts respectively, and the outsides of the two connecting parts are constructed with limiting grooves, and when the two caliper heads are in contact with each other, the two arc plates move to the far end of the slide groove to drive the two extensions to limit the position of the two connecting parts; The two puncture needles are hinged on the two curved plates respectively; When the pliers body is not in operation, the connecting shaft is at one end close to the pliers head, the driving shaft is located in the sleeve, and at this time, the two extension parts are respectively located in the two limiting grooves, so as to force the two pliers heads to overcome the elastic force of the second elastic member and be in a closed state; after the pliers body moves to the polyp sample position, the driving shaft can be driven to rotate by rotating the connecting shaft, thereby driving the sleeve to rotate through the driving shaft, and the rotation of the sleeve can drive the two arc plates to slide along the slide groove synchronously, so that the arc plate drives the extension part to move along the slide groove toward the proximal end, until the extension part moves out of the limiting groove, and the two connecting parts lose the restriction of the extension part and rotate around the rotating shaft, so that the two pliers heads move away from each other under the action of the second elastic member, thereby opening the two pliers heads; When the connecting shaft is pulled toward the proximal end, the interference between the conical portion and the driving shaft and the oblique rod can first force the two puncture needles to puncture and restrict the polyp sample. After the puncture needle completes the restriction of the polyp sample, the conical portion moves to the card slot position. At this time, continuing to pull the connecting shaft toward the proximal end can drive the drive block to move synchronously, thereby driving the two clamp heads to approach each other through the drive rod structure to clamp the polyp sample. When the connecting shaft is pulled toward the proximal end, the first stroke and the second stroke of the drive assembly are run in sequence, and the clamp heads only start to run after the puncture needle completes the restriction of the polyp sample, thereby stably clamping the polyp sample.

2. The precisely controllable colorectal polyp biopsy mechanism according to claim 1, wherein, It also includes a locking component, which locks the relative positions of the connecting shaft and the clamp body after the clamp head clamps the polyp sample.

3. The precise controllable colorectal polyp biopsy mechanism according to claim 2, wherein The locking assembly includes a locking block arranged in the caliper body, the outer wall of the connecting shaft is configured with a cross-section portion, and the caliper body is provided with a third elastic member for forcing the locking block to approach the connecting shaft.

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