An endoscopic surgical traction forceps

Abstract

This invention discloses an endoscopic surgical auxiliary traction forceps, comprising a forceps head, a sheath, and a handle connected in sequence. The sheath has a flexible section, in which a steering wire and a traction wire are fixed. One end of the steering wire is connected to a sheath bending control mechanism of the handle. The sheath bending mechanism is adapted to achieve bidirectional bending of the flexible section of the sheath by bidirectionally pulling the steering wire and locking the bending angle. One end of the traction wire is connected to a forceps head opening and closing control mechanism of the handle, and the other end is connected to the forceps head. The forceps head opening and closing control mechanism is adapted to achieve opening and closing of the forceps head and lock the opening and closing state by bidirectionally pulling the traction wire. This invention can determine the traction position, lock the traction angle, and maintain the current position, eliminating the need for the operator to manually control the entire process, thus improving operational comfort and accuracy.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an endoscopic surgical traction forceps for assisting in the traction of mucosal tissue during endoscopic surgery. Background Technology

[0002] Dissection of the submucosal tissue is the core of endoscopic submucosal dissection (ESD), and the exposure of the surgical field between the mucosa and submucosal tissue is crucial for the safety and success of the procedure. To facilitate ESD, several methods have been developed to assist the procedure, namely traction techniques. The fundamental purpose is to improve the field of vision and increase visibility of the submucosal layer, thereby enabling accurate identification of the cutting line, improving surgical efficiency, reducing operative time and complications, and allowing for the successful removal of lesions in difficult-to-reach areas via ESD.

[0003] Existing methods for assisted mucosal traction in ESD include percutaneous traction, gravity suspension, tissue clip traction, rubber band traction, elastic medical ring traction, and SO clip traction. These methods have low requirements for equipment, and some traction devices can be self-made by clinicians according to intraoperative needs. However, their disadvantages include poor flexibility in controlling the traction direction and force, and the risk of some devices becoming lodged in the body. Therefore, a surgical instrument with controllable traction direction and the ability to accurately grasp the lesion mucosa is needed.

[0004] Chinese patent document CN214017647U discloses a mucosal traction device and an endoscope system. The mucosal traction device includes a tube body, a first clamp, and a traction member. The first clamp is installed at the distal end of the tube body. The traction member has a first actuating part and a second actuating part. The first actuating part acts on the distal end of the tube body, and the second actuating part acts on the distal end of the endoscope. When the traction member is pulled, the distal end of the tube body and the distal end of the endoscope approach each other and remain fixed. When the traction member is released, the distal end of the tube body and the distal end of the endoscope can move independently. The endoscope system includes the aforementioned mucosal traction device.

[0005] Chinese patent document CN102125459B discloses a mucosal traction device, comprising: an endoscope fixing part that can be installed on the distal end of an endoscope; an instrument lifting part that can be installed with surgical instruments; a swing arm, one end of which is movably connected to the endoscope fixing part and the other end of which is movably connected to the instrument lifting part; and a traction part, the distal end of which is connected to the instrument lifting part.

[0006] Chinese patent document CN212438762U discloses an ESD surgical traction device, including a guide handle, a top cover, a guide ball, an outer tube, a guide tube, and a traction clamp; the outer tube, guide tube, and traction clamp are connected sequentially along the axial direction; the guide ball is fixedly connected to the outer tube; the top cover is fitted around the outer periphery of the guide ball and is configured to rotate along the spherical surface of the guide ball; a push-pull cable is connected to the guide handle, which passes sequentially through the top cover, guide ball, outer tube, and guide tube along the axial direction and is connected to the traction clamp; the guide handle is capable of reciprocating along the axial direction of the push-pull cable; a plurality of traction wires are connected to the top cover, and each traction wire passes over the guide ball along the outer periphery of the guide ball and connects to the end of the guide tube.

[0007] Of the three devices mentioned above, CN214017647U cannot control the traction angle independently, relying solely on the deflection of the endoscope tip to locate the lesion; CN102125459B relies on external force to deflect the lifting sleeve for directional control, also unable to accurately control the traction angle; and while CN212438762U integrates the bending and opening / closing of the forceps head into a single handle, it cannot independently maintain the opening / closing and bending states of the forceps head. This means that during traction of the lesion, the traction angle / position cannot be fixed, requiring manual control throughout the process, which is laborious. Existing devices often use a snake-bone structure for bending, which, due to the pull of the internal traction wire, easily causes deformation of the snake-bone structure in its original bending state, interfering with the operator's work. Summary of the Invention

[0008] The purpose of this invention is to overcome the defects of the prior art, improve the follow-up performance of the tissue forceps relative to the endoscope, and add the locking function of the tissue forceps operation state, so as to achieve precise positioning to the lesion and perform endoscopic surgery quickly and efficiently.

[0009] To achieve the above objectives, the present invention provides an endoscopic surgical auxiliary traction forceps, comprising a forceps head, a sheath, and a handle connected in sequence; the sheath has a bendable section, in which a steering wire and a traction wire are fixed; one end of the steering wire is connected to a sheath bending control mechanism of the handle, the sheath bending mechanism being adapted to achieve bidirectional bending of the bendable section of the sheath by bidirectionally pulling the steering wire and locking the bending angle therein; one end of the traction wire is connected to a forceps head opening and closing control mechanism of the handle, and the other end is connected to the forceps head, the forceps head opening and closing control mechanism being adapted to achieve opening and closing of the forceps head and lock the opening and closing state therein by bidirectionally pulling the traction wire.

[0010] Furthermore, the flexible section of the sheath has a multi-layered composite structure, consisting of a sheath, an outer snake bone, a steering wire, a snake bone connector, and an inner snake bone, arranged sequentially from the outside to the inside; the traction wire is accommodated and passes through the inner snake bone; both the outer and inner snake bones are suitable for bidirectional bending.

[0011] Furthermore, the outer snake bone is adapted to bend 270° in each direction.

[0012] Furthermore, the inner serpentine bone is adapted to bend 180° in each direction.

[0013] Furthermore, the outer snake bone, the inner snake bone, and the snake bone connector are fixedly connected at their proximal ends along the axis; the inner snake bone remains free to move at the end near the clamp head.

[0014] Furthermore, the steering wire is axially arranged on both sides of the sheath, and is adapted to bend the sheath to different sides by pulling one side of the steering wire toward the direction of the pliers or away from the pliers.

[0015] Furthermore, the sheath bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably disposed in the middle of the lower cover of the handle, and the roller is fixedly disposed in the rear of the lower cover; the steering wire extends to the roller after being fixed by the bending push button assembly, and then wraps tightly around the roller before folding back.

[0016] Furthermore, the bending push button assembly includes a second push button seat, on which a steering wire fixing interface is provided, and the steering wire is fixed to the steering wire fixing interface; the second push button seat is slidably disposed on the inner bottom surface of the lower cover, and a second spring is accommodated in the second push button seat; a second locking block is provided on the top surface of the second spring; a second screw with its head facing upward is built into the second locking block; and a second push button is screwed onto the second screw.

[0017] Furthermore, the steering wire includes at least an upper steering wire and a lower steering wire, which are either separate or continuous.

[0018] Furthermore, when the upper steering wire and the lower steering wire are continuous, the second push button seat is provided with a steering wire first scaling structure, which is adapted to simultaneously adjust the effective length of the upper steering wire and the lower steering wire.

[0019] Furthermore, the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod. The adjustment channel is a cavity that extends along the length of the lower cover. The adjustment rod, perpendicular to the extension direction of the adjustment channel, passes through one side wall of the cavity from the outside to the inside and is rotatably mounted on the other side wall. A through hole is radially opened in the middle section of the adjustment rod. The adjustment channel serves as a passage for the steering wire and an effective length scaling channel. The steering wire can be directly wound around the adjustment rod a certain number of times or pass through the through hole and then wound around the adjustment rod a certain number of times.

[0020] Furthermore, the steering wire sequentially includes an upper steering wire, an adjusting steering wire, and a lower steering wire, which are continuous with each other; the second push button seat is provided with a second steering wire scaling structure, which is adapted to adjust the effective length of the upper steering wire and the lower steering wire in both directions by scaling the length of the adjusting steering wire in both directions.

[0021] Furthermore, the second scaling structure of the steering wire includes an adjustment channel, a left adjuster, and a right adjuster. The adjustment channel is a cavity that extends along the length of the lower cover. The left and right adjusters are perpendicular to the extension direction of the adjustment channel, passing through one side wall of the cavity from the outside to the inside, and are rotatably mounted on the other side wall. The middle sections of the left and right adjusters are radially provided with through holes. The adjustment channel serves as a passage for the steering wire and an effective length scaling channel. The steering wire can be directly wound around the left and right adjusters a certain number of times, or pass through each of the through holes and then be wound around the left and right adjusters a certain number of times.

[0022] Furthermore, the handle includes a top cover, and the inner top surface of the top cover is provided with a plurality of slots; the second block has at least one second protrusion, which is adapted to be inserted into the slots to fix the position of the second push button seat.

[0023] Furthermore, the upper cover is provided with a sliding groove, through which the second push button extends from the upper cover and is adapted to move back and forth along the sliding groove.

[0024] Furthermore, the upper cover is provided with a guide groove, which is adapted to accommodate and guide the steering wire.

[0025] Furthermore, a guide sleeve is provided inside the guide groove.

[0026] Furthermore, the receiving cavity of the second push button seat has an inwardly extending second limiting portion.

[0027] Furthermore, the clamp opening and closing control mechanism includes a clamping push button assembly located at the front of the lower cover of the handle. The clamping push button assembly includes a first push button seat, on which a traction wire fixing interface is provided, and the traction wire is fixed to the traction wire fixing interface. The first push button seat is slidably disposed on the inner bottom surface of the lower cover. A first spring is accommodated in the first push button seat. A first locking block is provided on the top surface of the first spring. A first screw with its head facing upward is built into the first locking block. A first push button is screwed onto the first screw.

[0028] Furthermore, the first locking block has at least one first protrusion, which is adapted to be embedded in several slots on the upper cover of the handle to fix the position of the first push button seat.

[0029] Furthermore, the receiving cavity of the first push button seat has an inwardly extending first limiting portion.

[0030] Furthermore, the handle includes a stress diffusion tube that is connected to the sheath.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. It can achieve precise control of the traction angle, including 180° bidirectional bending of the clamp head and 360° twisting of the tube body, basically covering the angle required for operation.

[0033] 2. It can determine the traction position, lock the traction angle, and maintain the current position, so that the operator does not need to manually control the entire process, thus improving the comfort and accuracy of operation.

[0034] 3. Add a support structure at the bending position, cover the traction wire that controls the opening and closing of the clamp head and bend simultaneously with the bending section to provide support, prevent deformation of the bending section, and reduce operational interference. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram (cross-section) of the sheath tube in one embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the lower cover in one embodiment of the present invention (including the sheath bending mechanism and the clamp opening and closing control mechanism);

[0038] Figure 4 This is a schematic diagram of the clamping push button assembly of the clamp opening and closing control mechanism in one embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the bending push button assembly of the sheath bending mechanism in one embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the upper cover in one embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the first scaling structure of the steering wire in one embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of the second scaling structure of the steering wire in one embodiment of the present invention.

[0043] In the picture:

[0044] 1-Pliers head; 2-Sheath; 21-Wrapping tube; 22-Outer snake bone; 221-Swivel wire; 221a-Upper swivel wire; 221b-Lower swivel wire; 221c-Adjusting section swivel wire; 23-Inner snake bone; 24-Snake bone connector; 25-Outer sheath; 26-Inner tube; 27-Traction wire; 3-Handle; 31-Upper cover; 311-Slot; 312-Guide groove; 313-Slide groove; 32-Lower cover; 33-Clamping push button assembly; 331-First push button; 332-First push button seat ; 3321-First limiting part; 333-First locking block; 3331-First protrusion; 334-First spring; 335-First screw; 34-Bending push button assembly; 341-Second push button; 342-Second push button seat; 3421-Second limiting part; 343-Second locking block; 3431-Second protrusion; 344-Second spring; 345-Second screw; 346-Adjusting rod; 347-Left adjuster; 348-Right adjuster; 35-Roller; 36-Stress diffusion tube. Detailed Implementation

[0045] The embodiments of the present invention are described below with reference to the accompanying drawings and specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0046] It should be noted that the directional terms mentioned in this article, such as up, down, left, right, front, middle, back, bottom, top, inside, and outside, all refer to the directions shown in the figures. This is for the sake of convenience and is not intended to limit the invention in any way.

[0047] like Figures 1-6 As shown, one embodiment of the endoscopic surgical auxiliary traction forceps of the present invention includes a forceps head 1, a sheath 2, and a handle 3 connected in sequence; the sheath 2 has a flexible section, in which a steering wire 221 and a traction wire 27 are accommodated and fixed; one end of the steering wire 221 is connected to a sheath bending control mechanism of the handle 3, the sheath bending mechanism being adapted to achieve bidirectional bending of the flexible section of the sheath 2 by bidirectionally pulling the steering wire 221 and locking and maintaining the bending angle; one end of the traction wire 27 is connected to a forceps head opening and closing control mechanism of the handle 3, and the other end is connected to the forceps head 1, the forceps head opening and closing control mechanism being adapted to achieve opening and closing of the forceps head 1 and lock and maintain the open / closed state by bidirectionally pulling the traction wire 27.

[0048] In this embodiment, the flexible portion of the endoscope and the flexible section of the sheath 2 of the traction forceps overlap and are bound together. Whenever the flexible portion of the endoscope bends, the flexible section of the sheath 2 will automatically bend as well, providing good responsiveness and effectively reducing the operating radius. The handle 3 of the traction forceps is equipped with a sheath bending control mechanism to control the bending angle and direction of the flexible section of the sheath 2. It can be bent in a specific direction as needed and adjusted to a suitable bending angle. Once adjusted, it can be locked at that bending angle, eliminating the need for manual holding of a specific part to maintain the bending angle, saving time and effort, and providing convenience and speed. Similarly, the handle 3 of the traction forceps is equipped with a clamp head opening and closing control mechanism to control the opening or closing of the clamp head 1, and can lock the open or closed state. That is, if it is in the closed state, it will remain closed; if it is in the open state, the opening size will remain unchanged, eliminating the need for manual maintenance. A bidirectional bending angle indicator can be provided on the sheath bending control mechanism side of the handle 3 to make the bending angle control more precise.

[0049] In one embodiment, the flexible section of the sheath 2 has a multi-layered composite structure, consisting of, from the outside in, a sheath 21, an outer snake bone 22, a steering wire 221, a snake bone connector 24, and an inner snake bone 23; the traction wire 27 is accommodated and passes through the inner snake bone 23; both the outer snake bone 22 and the inner snake bone 23 are suitable for bidirectional bending. In this embodiment, the snake bone connector 24 connects the inner snake bone 23 and the outer snake bone 22 at its proximal end, allowing the steering wire 221 on the outer snake bone 22 to pass through the gap between the inner snake bone 23 and the outer snake bone 22. The outer snake bone 22 and the inner snake bone 23 can be made of stainless steel, nickel-titanium alloy, or other metals. The traction wire 27 can be sheathed with a friction-reducing tubing, made of PTFE or other polymer materials. Figure 2As shown, the sheath 2 also includes a common section, which includes an outer sheath 25 and an inner tube 26. The inner tube 26 is connected to the outer snake bone 22. The inner tube 26 is in the form of a flexible snake bone or a spring tube, and is made of stainless steel, NiTi alloy, or other metal materials. The outer sheath 21 covers the outside of the outer snake bone 22, and the outer sheath 25 covers the outside of the inner tube 26. The outer sheath 25 is made of a polymer material with high lubricity, and the outer sheath 21 is made of a polymer material with high elasticity. In this embodiment, when the outer snake bone 22 is bent, when the clamping head 1 is closed, pulling the traction wire 27 away from the clamping head 1 will cause the traction wire 27 to adhere tightly to the inner wall of the inner snake bone 23. At this time, due to the locking structure (not shown in the figure, belonging to the prior art) provided on the inner snake bone 23, the inner snake bone 23 supports the traction wire 27, thereby avoiding affecting the bending state of the outer snake bone 22 and solving the problem of mutual interference between the opening and closing of the clamping head 1 and the bending angle. The tip of the traction clamp adopts a snake-bone structure, which can easily achieve bidirectional 180° bending of the head. The inner snake bone 23 can effectively reduce the deformation or control interference caused by the force exerted by the traction wire 27 on the outer snake bone 22 when the clamp head 1 opens and closes.

[0050] In one embodiment, the external sheath 22 is adapted to bend 270° in each direction. In this embodiment, the external sheath 22 can bend up to 270° in each of the two opposite directions. The external sheath 22 is directly adjacent to or in contact with the flexible part of the endoscope, and its large bendability will inevitably make the entire sheath 2 more responsive.

[0051] In one embodiment, the inner sheath 23 is adapted to bend 180° in each direction. In this embodiment, the inner sheath 23 can bend up to 180° in each of the two opposite directions, which allows for better matching with the outer sheath 22 and improves the overall responsiveness of the sheath 2.

[0052] In one embodiment, the outer snake bone 22, the inner snake bone 23, and the snake bone connector 24 are axially fixedly connected at their proximal ends; the inner snake bone 23 remains free to move at the end near the pliers head 1. In this embodiment, the proximal ends (the end near the handle 3, also called the rear end) of the outer snake bone 22 and the inner snake bone 23 are connected by the snake bone connector 24, and the distal ends (the end away from the handle 3, also called the front end) of the outer snake bone 22 and the inner snake bone 23 can move relative to each other. When the outer snake bone 22 is bent under force, it causes the inner snake bone 23 to bend. Since the proximal end is fixed, the bending angle of the inner snake bone 23 is smaller than the bending angle of the outer snake bone 22. Therefore, the front end of the inner snake bone 23 extends forward relative to the outer snake bone 22, and a gap of less than 5mm is left between the inner snake bone 23 and the inner bottom of the pliers head 1. This reserved gap is filled by the extended inner snake bone 23 when bending.

[0053] In one embodiment, the directional wire 221 is axially arranged on both sides of the sheath 2, suitable for bending the sheath 2 to different sides by pulling one side of the directional wire 221 towards or away from the forceps head 1. In this embodiment, the directional wire 221 is a continuous integral piece arranged on both sides of the sheath 2, and the sheath 2 can be bent to different sides by applying external forces in different directions to one side of the directional wire 221. It should be noted that only the tip of the directional wire 221 is connected to the front end of the outer serpentine bone 22, and the directional wire 221 passes through the protrusions provided in the inner wall of the outer serpentine bone 22. When the directional wire 221 is pulled, the directional wire 221 slides to a certain extent relative to the outer serpentine bone 22. During this process, the length of the directional wire 221 in the outer serpentine bone 22 becomes shorter, and the outer serpentine bone 22 is bent. It should be noted that the purpose of this bending is to fine-tune the position after the endoscope has been bent to the appropriate position, so that the forceps head 1 can more accurately approach the tissue to be removed.

[0054] In one embodiment, the sheath bending control mechanism includes a bending push button assembly 34 and a roller 35; the bending push button assembly 34 is slidably disposed in the middle of the lower cover 32 of the handle 3, and the roller 35 is fixedly disposed in the rear of the lower cover 32; the guide wire 221 extends to the roller 35 after being fixed by the bending push button assembly 34, and is wrapped tightly around the roller 35 before being folded back. In this embodiment, the guide wire 221 is guided back by the roller 35 and then disposed on both sides of the lower cover 32, which corresponds exactly to the distribution of the guide wire 221 on both sides of the sheath 2 in the previous embodiment; the guide wire 221 is fixed on the bending push button assembly 34, and as the bending push button assembly 34 moves, the guide wire 221 will inevitably be pulled, such as Figure 3 As shown, the bending push button assembly 34 can move to the left or to the right. The direction of force on the steering wire 221 is different depending on the direction of movement, which ultimately causes the steering wire 221 in the sheath tube 2 to bend the sheath tube 2 to different sides. The roller 35 connects the steering wire 221 with the second push button 341, which improves the synchronization and allows the steering wire on one side to be tightened while the steering wire on the other side is loosened.

[0055] In one embodiment, such as Figure 3 and Figure 5As shown, the curved push button assembly 34 includes a second push button seat 342, on which a steering wire fixing interface is provided, and the steering wire 221 is fixed to the steering wire fixing interface. The second push button seat 342 is slidably disposed on the inner bottom surface of the lower cover 32. A second spring 344 is accommodated in the second push button seat 342, and a second locking block 343 is provided on the top surface of the second spring 344. A second screw 345 with its head facing upward is built into the second locking block 343, and a second push button 341 is screwed onto the second screw 345. In this embodiment, the second push button seat 342 is provided with two steering wire fixing interfaces a and b. The steering wire 221 enters from interface a and exits from interface b. The steering wire 221 is fixed on the second push button seat 342, that is, there is no relative movement between the two. Figure 3 It is evident that the positions of interfaces a and b, i.e., the position of the left steering screw 221, are significantly higher than the right steering screw 221. Figure 3 The left-hand steering wire 221 extends to the upper side inside the sheath 2. Figure 3 The steering wire 221 on the right side extends and is located on the lower side inside the sheath 2. Pushing the second push button 341 to the left or right will cause the second push button seat 342 to slide to the left or right, thus... Figure 3 The steering screw 221 on the left side is subjected to a pulling force to the left or right. Specifically, if the second push button 341 is pushed to the left (i.e., moved towards the direction of the clamp head 1, or forward), then... Figure 3 The left-hand guide wire 221a is pulled to the left at the right side of the interface b. The right-hand guide wire 221b, after being wound and folded back by the roller 35, is pulled to the right. Therefore, the lower guide wire 221b inside the sheath 2 is pulled to the right. The outer snake bone 22 is pulled to the right by the lower guide wire 221b, causing it to bend downwards. The inner snake bone 23 is deformed and compressed by the outer snake bone 22, causing it to bend in the same direction as the outer snake bone 23. Conversely, if the second push button 341 is pushed to the right (i.e., away from the clamp head 1, or moved backwards), then... Figure 3 When the left-hand steering wire 221a is pulled to the right at the left side of interface a, the upper steering wire 221a inside the sheath 2 is also pulled to the right. The outer snake bone 22 is pulled to the right by the upper steering wire 221a, causing it to bend upwards. The inner snake bone 23 is compressed by the deformation of the outer snake bone 22, causing it to bend in the same direction as the outer snake bone 23. In this embodiment, the bidirectional bending of the sheath 2 is cleverly achieved by changing the direction of force through the winding and folding of the roller 35. The bending angle is related to the moving distance of the second push button 341 and can be determined according to actual needs.

[0056] In one embodiment, such as Figure 3As shown, the steering wire 221 includes at least an upper steering wire 221a and a lower steering wire 221b, which may be separated or continuous. In this embodiment, if the upper steering wire 221a and the lower steering wire 221b are separated, that is, they are disconnected, one end of the upper steering wire 221a terminates at the steering wire fixing interface a, and one end of the lower steering wire 221b terminates at the steering wire fixing interface b. If the upper steering wire 221a and the lower steering wire 221b are continuous, that is, they are connected together as a whole, and there is a cavity between the steering wire fixing interface a and the steering wire fixing interface b for the steering wire 221 to pass through, but the steering wire 221 is fixed at both the steering wire fixing interface a and the steering wire fixing interface b. This design, which allows for both separation and continuity, increases the flexibility of the steering wire 221. In particular, in continuous operation, it allows for easy adjustment of the effective length of the upper steering wire 221a and / or the lower steering wire 221b. The effective length refers to the actual length involved in the bending operation.

[0057] In one embodiment, such as Figure 7 As shown, when the upper steering wire 221a and the lower steering wire 221b are continuous, the second push button seat 342 is provided with a first steering wire scaling structure, which is adapted to simultaneously adjust the effective lengths of the upper steering wire 221a and the lower steering wire 221b. In this embodiment, as the first steering wire scaling structure on the second push button seat 342 moves, the effective lengths of the upper steering wire 221a and the lower steering wire 221b can be adjusted simultaneously, thus adjusting the tightness of the entire device, including the state of the clamp head 1 in a non-bent state: loose or tight.

[0058] In one embodiment, such as Figure 7As shown in (a)-(c), the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod 346. The adjustment channel is a cavity extending along the length of the lower cover 32. The adjustment rod 346, perpendicular to the extension direction of the adjustment channel, passes through one side wall of the cavity from the outside to the inside and is rotatably mounted on the other side wall. A through hole is radially provided in the middle section of the adjustment rod 346. The adjustment channel serves as a passage for the steering wire 221 and an effective length scaling channel. The steering wire 221 can be directly wound around the adjustment rod 346 a certain number of turns or pass through the through hole and then wound around the adjustment rod 346 a certain number of turns. In this embodiment, the adjustment rod 346 can be a dumbbell-shaped screw with a slotted groove at the head end, a slightly narrower middle section, and a threaded end that can mate with the other side wall of the cavity. A through hole is provided in the middle section, allowing the adjustment rod 346 to be rotated counterclockwise or clockwise by inserting a tool into the slotted groove. The guide wire 221 can be wound after passing through the through hole of the adjusting rod 346, or it can be wound directly without passing through the through hole. When using the former winding method, rotating the adjusting rod 346, whether clockwise or counterclockwise, shortens the effective length of the upper guide wire 221a, while the effective length of the lower guide wire 221b shortens when rotated clockwise and lengthens when rotated counterclockwise. When using the latter winding method, rotating the adjusting rod 346 clockwise shortens the effective length of the upper guide wire 221a and lengthens the effective length of the lower guide wire 221b, while rotating it counterclockwise is the opposite: the effective length of the upper guide wire 221a lengthens and the effective length of the lower guide wire 221b shortens. Multiple scaling adjustment methods increase the flexibility of use, allowing selection based on actual needs.

[0059] In one embodiment, such as Figure 8 As shown, the steering wire 221 sequentially includes an upper steering wire 221a, an adjusting steering wire 221c, and a lower steering wire 221b, which are continuous. The second push-button seat 342 is provided with a second steering wire scaling structure, which is adapted to adjust the effective lengths of the upper steering wire 221a and the lower steering wire 221b bidirectionally by scaling the length of the adjusting steering wire 221c. In this embodiment, the adjusting steering wire 221c is a reserved section located between the upper steering wire 221a and the lower steering wire 221b, used to adjust the effective lengths on both sides, increasing the flexibility of use.

[0060] In one embodiment, such as Figure 8As shown in (a)-(c), the second scaling structure of the steering wire includes an adjustment channel, a left adjuster 347, and a right adjuster 348. The adjustment channel is a cavity that extends along the length of the lower cover 32. The left adjuster 347 and the right adjuster 348 are perpendicular to the extension direction of the adjustment channel, passing through one side of the cavity wall from the outside to the inside, and can be rotatably mounted on the other side of the cavity wall. The middle sections of the left adjuster 347 and the right adjuster 348 are radially provided with through holes. The adjustment channel is used as a passage for the steering wire 221 to pass through and for scaling its effective length. The steering wire 221 can be directly wound around the left adjuster 347 and the right adjuster 348 a certain number of turns, or pass through each of the through holes and then be wound around the left adjuster 347 and the right adjuster 348 a certain number of turns. In this embodiment, the entire guide wire 221 is divided into three segments via two adjusters: an upper guide wire 221a, a lower guide wire 221b, and an adjusting guide wire 221c located between the two adjusters, which control the bending direction of the pliers 1. The left adjuster 347 can adjust the effective length of the upper guide wire 221a, and the right adjuster 348 can adjust the effective length of the lower guide wire 221b. Similar to the embodiment of the first scaling structure described above, different winding methods have different adjustment effects. It should be noted that when the winding method is used after passing through the through hole, such as... Figure 8 As shown in (b)-(c), the rotation of the transverse groove on the regulator head causes the through hole through which the guide wire 221 passes to open (the axis of the through hole is parallel to the axis of the adjustment channel) or close (the axis of the through hole is perpendicular to the axis of the adjustment channel) relative to the adjustment channel, similar to the opening and closing of a valve, thus controlling the guide wire 221 to be locked (see...). Figure 8 (c)) or relax (see Figure 8 (b) State. By adjusting the length of the upper steering wire 221a and selecting the adjuster to the closed state, the tension of the upper steering wire 221a can be adjusted. By adjusting the length of the lower steering wire 221b and selecting the adjuster to the closed state, the tension of the lower steering wire 221b can be adjusted. By adjusting the lengths of both the upper and lower steering wires 221a and 221b and selecting both adjusters to the closed state, the tension of the steering wires in the entire system can be adjusted. At the same time, due to the linkage between the steering wire 221 and the second push button seat 342, the force required to operate the bending push button assembly 34 is also changed, thereby changing the curvature of the associated part.

[0061] In one embodiment, such as Figure 6As shown, the handle 3 includes a top cover 31, and the inner top surface of the top cover 31 is provided with a plurality of slots 311; the second locking block 343 has at least one second protrusion 3431, which is adapted to be inserted into the slot 311 to fix the position of the second push button seat 342. In this embodiment, the movement distance of the second push button 341 in the previous embodiment is locked by the cooperation of the second protrusion 3431 and the slot 311, that is, the bending angle of the sheath 2 is locked. It should be noted that the multiple slots 311 are arranged at equal intervals, and the size of the interval is related to the adjustment accuracy of the bending angle. The smaller the interval, the higher the adjustment accuracy. In conjunction with the previous embodiment, before pushing the second push button 341, it is necessary to press its top first. At this time, the second spring 344 below it is compressed, reducing its height, and the second protrusion 3431 on it disengages from the slot 311, so that it can move freely. After the second push button 341 moves into place, release your hand from its top, causing it to rise under the elastic force of the second spring 344. Then, the second protrusion 3431 on it will be embedded in the slot 311 to achieve position locking.

[0062] In one embodiment, such as Figure 6 As shown, the upper cover 31 is provided with a sliding groove 313, and the second push button 341 extends out of the upper cover 31 via the sliding groove 313 and is adapted to move back and forth along the sliding groove 313. In this embodiment, the sliding groove 313 provides space for the second push button 341 to move left and right. The movable distance of the second push button 341 can be changed by changing the length of the sliding groove 313, which also sets the bendable angle of the sheath 2. The length of the sliding groove 313 is generally the same as the total length of the multiple slots 311.

[0063] In one embodiment, such as Figure 6 As shown, the upper cover 31 is provided with a guide groove 312, which is adapted to accommodate and guide the steering wire 221. In this embodiment, the guide groove 312 limits the position and movement trajectory of the steering wire 221, thus preventing the steering wire 221 from shifting position under force and during movement, which would affect the accuracy of bending angle control. A soft rubber coating can be applied to the outer top surface of the upper cover 31 to prevent foreign objects from entering and affecting operation.

[0064] In one embodiment, a guide sleeve is provided within the guide groove 312. In this embodiment, the guide sleeve can reduce the frictional resistance of the steering wire 221. The guide sleeve can be made of a polymer material with high lubricity.

[0065] In one embodiment, such as Figure 5As shown, the receiving cavity of the second push button seat 342 has an inwardly extending second limiting portion 3421. In this embodiment, the second limiting portion 3421 can effectively prevent the second locking block 343 from dislodging from the second push button seat 1342.

[0066] In one embodiment, such as Figure 3 and Figure 4 As shown, the clamp opening and closing control mechanism includes a clamping push button assembly 33 located at the front of the lower cover 32 of the handle 3. The clamping push button assembly 33 includes a first push button seat 332, on which a traction wire fixing interface c is provided. The traction wire 27 is fixed to the traction wire fixing interface c. The first push button seat 332 is slidably disposed on the inner bottom surface of the lower cover 32. A first spring 334 is accommodated in the first push button seat 332. A first locking block 333 is provided on the top surface of the first spring 334. A first screw 335 with its head facing upward is built into the first locking block 333. A first push button 331 is screwed onto the first screw 335. In this embodiment, the traction wire 27 is fixed to the traction wire fixing interface c, that is, there is no relative movement between the two. Pushing the first push button 331 to the left or right will cause the first push button seat 332 to slide to the left or right, so that the traction wire 27 is subjected to a leftward or rightward pulling force. Specifically, if the first push button 331 is pushed to the left (i.e., towards the jaws 1, or forward), the traction wire 27 is pushed to the left, and the jaws 1 connected to the traction wire 27 are pushed open. Conversely, if the first push button 331 is pushed to the right (i.e., away from the jaws 1, or backward), the traction wire 27 is pulled to the right, and the jaws 1 connected to the traction wire 27 are pulled closed. Both the first push button 331 and the second push button 341 can be operated independently without interference, and can be used in situations requiring one-handed operation.

[0067] In one embodiment, such as Figure 3 and Figure 4As shown, the first locking block 333 has at least one first protrusion 3331, which is adapted to be embedded in several slots 311 on the upper cover 31 of the handle 3 to fix the position of the first push button seat 332. In this embodiment, the movement distance of the first push button 331 in the previous embodiment is locked by the cooperation of the first protrusion 3331 and the slots 311, that is, the open or closed state of the pliers 1 is locked. When open, the size of the opening is locked, and when closed, the degree of closure is locked, that is, the size of the remaining opening, collectively referred to as the opening degree. It should be noted that the multiple slots 311 are arranged at equal intervals, and the size of the interval is related to the adjustment accuracy of the opening degree of the pliers 1. The smaller the interval, the higher the adjustment accuracy. In conjunction with the previous embodiment, before pushing the first push button 331, it is necessary to press its top first. At this time, the first spring 334 below it is compressed, reducing its height, and the first protrusion 3331 on it disengages from the slot 311, so that it can move freely. After the first push button 331 moves into place, release your hand from its top, causing it to rise under the elastic force of the first spring 334. Then, the first protrusion 3331 on it will be inserted into the slot 311 to achieve position locking.

[0068] In one embodiment, such as Figure 4 As shown, the receiving cavity of the first push button seat 332 has an inwardly extending first limiting portion 3321. In this embodiment, the first limiting portion 3321 can effectively prevent the first locking block 333 from dislodging from the first push button seat 332.

[0069] In one embodiment, the handle 3 includes a stress diffusion tube 36, which is connected to the sheath 2. In this embodiment, the stress diffusion tube 36 can disperse the stress between the sheath 2 and the handle 3, effectively preventing the sheath 2 from deforming at the connection point.

[0070] In one embodiment, the operation can be carried out according to the following process:

[0071] S1. Operate the traction clamp 3, press down the second push button 341, the second screw 345 drives the second locking block 343 to move downward, the second spring 344 is compressed, the second protrusion 3431 on the second locking block 343 disengages downward from the locking groove 1311 of the upper cover 131, press down the second push button 1341 and push it towards the clamp head 11, the second push button seat 1342 moves forward, the steering wire 1221b connected to the interface b is pulled forward, due to the guiding effect of the roller 135, the steering wire 1221b inside the outer snake bone 122 moves backward, the outer snake bone 122 is pulled and deformed by the steering wire 1221b, and bends downward, the inner snake bone 123 is deformed and squeezed by the outer snake bone 122, and bends in the same direction as the outer snake bone 123. When the bend reaches the appropriate angle, the operator releases the second push button 1341, and the second spring 1344, which is built into the second push button seat 1342, rebounds, pushing the second locking block 343 upward back into the corresponding slot 311. The second locking block 343 cooperates with the slot 331 to fix the bending push button assembly 34, thereby fixing the position of the steering wire 221b relative to the outer snake bone 22, and locking it to keep the bending angle unchanged.

[0072] S2. Press down on the second push button 341. The second screw 345 drives the second locking block 343 to move downward. The second spring 344 is compressed. The second protrusion 3431 on the second locking block 343 disengages downward from the slot 311 of the upper cover 31. Press down on the second push button 341 and push it away from the pliers head 1. The second push button seat 342 moves backward. The directional wire 221a connected to the interface a is pulled backward. The directional wire 221b connected to the interface b moves backward. After being guided by the roller 35, the directional wire 221b moves forward. For the outer snake bone 22, the upper directional wire 221a is tightened and the lower directional wire 221b is relaxed. The outer snake bone 22 bends and deforms in the direction of the tightened directional wire, that is, upward. The inner snake bone 23 is deformed and squeezed by the outer snake bone 22, and bends and deforms in the same direction as the outer snake bone 23. When the bend reaches the appropriate angle, the operator releases the second push button 341, and the second spring 344, which is built into the second push button seat 342, rebounds, pushing the second locking block 343 upward back into the corresponding slot 311. The second locking block 343 cooperates with the slot 331 to fix the bending push button assembly 34, thereby fixing the position of the steering wire 221 relative to the outer snake bone 22 and locking it to keep the bending angle unchanged.

[0073] S3. Press down on the first push button 331. The first screw 335 drives the first locking block 333 to move downward. The first spring 334 is compressed. The first protrusion 3331 on the first locking block 333 disengages downward from the slot 311 of the upper cover 31. Press down on the first push button 331 and push it towards the pliers head 1. The first push button seat 332 pushes the traction wire 27 forward. The traction wire 27 pushes the pliers head 1 to open. When it is opened to the appropriate position, the operator releases the first push button 331. The first spring 334 rebounds and pushes the first locking block 333 upward back into the corresponding slot 311. The first locking block 333 cooperates with the slot 331 to fix the push button assembly 33, thereby fixing the position of the traction wire 27 relative to the pliers head 1 and locking the open position of the pliers head 1 unchanged, that is, the opening size remains unchanged.

[0074] S4. Press down on the first push button 331. The first screw 335 drives the first locking block 333 to move downward. The first spring 334 is compressed. The first protrusion 3331 on the first locking block 333 disengages downward from the slot 311 of the upper cover 31. Press down on the first push button 331 and push it away from the pliers head 1. The first push button seat 332 pushes the traction wire 27 backward. The traction wire 27 pulls the pliers head 1 to close. When closed to the appropriate position, the operator releases the first push button 331. The first spring 334 rebounds and pushes the first locking block 333 upward back into the corresponding slot 311. The first locking block 333 cooperates with the slot 331 to fix the push button assembly 33, thereby fixing the position of the traction wire 27 relative to the pliers head 1 and locking the closed position of the pliers head 1 unchanged, that is, the remaining opening size remains unchanged. When the outer snake bone 22 is bent, and the operating clamp head 1 is closed, pulling the traction wire 27 away from the clamp head will cause the traction wire 27 to adhere tightly to the inner wall of the inner snake bone 23. Due to the locking structure set on the inner snake bone 23 at this time, the inner snake bone supports the traction wire 27, thereby avoiding affecting the bending state of the outer snake bone 22 and solving the problem of mutual interference between the opening and closing of the clamp head 1 and the bending angle.

[0075] S5. By repeatedly performing two or more of the steps in S1-S4 as needed during the surgical procedure, the endoscopic surgical traction function can be achieved.

[0076] 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An endoscopic surgical auxiliary traction forceps, characterized in that, The device includes a clamp head, a sheath, and a handle connected in sequence. The sheath has a flexible section, in which a guide wire and a traction wire are fixedly arranged. One end of the guide wire is connected to a sheath bending control mechanism of the handle. The sheath bending control mechanism is adapted to achieve bidirectional bending of the flexible section of the sheath by bidirectional pulling of the guide wire and lock and maintain the bending angle. One end of the traction wire is connected to a clamp head opening and closing control mechanism of the handle, and the other end is connected to the clamp head. The clamp head opening and closing control mechanism is adapted to achieve opening and closing of the clamp head and lock and maintain the open / closed state by bidirectional pulling of the traction wire. The flexible section of the sheath has a multi-layered composite structure, consisting of a sheath, an outer snake bone, a steering wire, a snake bone connector, and an inner snake bone, arranged from the outside in. The outer snake bone, the inner snake bone, and the snake bone connector are fixedly connected at their proximal axial ends, while the outer snake bone and the inner snake bone at the end furthest from the handle are movable relative to each other. The traction wire is accommodated and passes through the inner snake bone. Both the outer and inner snake bones are suitable for bidirectional bending. The steering wire is disposed on the outer snake bone. When the outer snake bone is bent and deformed by the traction of the steering wire, the inner snake bone is deformed and compressed by the outer snake bone, resulting in bending deformation in the same direction as the outer snake bone.

2. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The outer serpentine bone is adapted to bend 270° in both directions.

3. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The inner serpentine bone is adapted to bend 180° in both directions.

4. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The inner snake bone remains free to move at the end near the pincer head.

5. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The steering wire is axially arranged on both sides of the sheath, and is adapted to bend the sheath to different sides by pulling one side of the steering wire toward the direction of the pliers or away from the pliers.

6. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The sheath bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably disposed in the middle of the lower cover of the handle, and the roller is fixedly disposed in the rear of the lower cover; the steering wire extends to the roller after being fixed by the bending push button assembly, and then wraps tightly around the roller before folding back.

7. The endoscopic surgical auxiliary traction forceps according to claim 6, characterized in that, The bending push button assembly includes a second push button seat, on which a steering wire fixing interface is provided, and the steering wire is fixed to the steering wire fixing interface; the second push button seat is slidably disposed on the inner bottom surface of the lower cover, and a second spring is accommodated in the second push button seat; a second locking block is provided on the top surface of the second spring; a second screw with its head facing upward is built into the second locking block; and a second push button is screwed onto the second screw.

8. The endoscopic surgical auxiliary traction forceps according to claim 7, characterized in that, The steering wire includes at least an upper steering wire and a lower steering wire, which are either separate or continuous.

9. The endoscopic surgical auxiliary traction forceps according to claim 8, characterized in that, When the upper steering wire and the lower steering wire are continuous, the second push button seat is provided with a steering wire first scaling structure, which is adapted to simultaneously adjust the effective length of the upper steering wire and the lower steering wire.

10. The endoscopic surgical auxiliary traction forceps according to claim 9, characterized in that, The first scaling structure of the steering wire includes an adjustment channel and an adjustment rod. The adjustment channel is a cavity that extends along the length of the lower cover. The adjustment rod is perpendicular to the extension direction of the adjustment channel, passes through one side wall of the cavity from the outside to the inside, and is rotatably mounted on the other side wall. A through hole is radially opened in the middle section of the adjustment rod. The adjustment channel serves as a passage for the steering wire and an effective length scaling channel. The steering wire can be directly wound around the adjustment rod a certain number of times or pass through the through hole and then wound around the adjustment rod a certain number of times.

11. The endoscopic surgical auxiliary traction forceps according to claim 8, characterized in that, The steering wire includes an upper steering wire, an adjusting steering wire, and a lower steering wire, which are continuous with each other; the second push button seat is provided with a second steering wire scaling structure, which is adapted to adjust the effective length of the upper steering wire and the lower steering wire in both directions by scaling the length of the adjusting steering wire in both directions.

12. The endoscopic surgical auxiliary traction forceps according to claim 11, characterized in that, The second scaling structure of the steering wire includes an adjustment channel, a left adjuster, and a right adjuster. The adjustment channel is a cavity that extends along the length of the lower cover. The left and right adjusters are perpendicular to the extension direction of the adjustment channel, passing through one side wall of the cavity from the outside to the inside, and are rotatably mounted on the other side wall. The middle section of the left and right adjusters is radially provided with through holes. The adjustment channel serves as a passage for the steering wire and an effective length scaling channel. The steering wire can be directly wound around the left and right adjusters a certain number of times, or pass through each of the through holes and then be wound around the left and right adjusters a certain number of times.

13. The endoscopic surgical auxiliary traction forceps according to claim 7, characterized in that, The handle includes a top cover, and the inner top surface of the top cover is provided with a plurality of slots; the second block has at least one second protrusion, which is adapted to be inserted into the slots to fix the position of the second push button seat.

14. The endoscopic surgical auxiliary traction forceps according to claim 13, characterized in that, The upper cover is provided with a sliding groove, and the second push button extends out of the upper cover through the sliding groove and is adapted to move back and forth along the sliding groove.

15. The endoscopic surgical auxiliary traction forceps according to claim 13, characterized in that, The upper cover is provided with a guide groove, which is adapted to accommodate the steering wire and guide it.

16. The endoscopic surgical auxiliary traction forceps according to claim 15, characterized in that, The guide groove is equipped with a guide sleeve.

17. The endoscopic surgical auxiliary traction forceps according to claim 7, characterized in that, The receiving cavity of the second push button seat has an inwardly extending second limiting portion.

18. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The clamp opening and closing control mechanism includes a clamping push button assembly located at the front of the lower cover of the handle. The clamping push button assembly includes a first push button seat, on which a traction wire fixing interface is provided, and the traction wire is fixed to the traction wire fixing interface. The first push button seat is slidably disposed on the inner bottom surface of the lower cover. A first spring is accommodated in the first push button seat. A first locking block is provided on the top surface of the first spring. A first screw with its head facing upward is built into the first locking block. A first push button is screwed onto the first screw.

19. The endoscopic surgical traction forceps according to claim 18, characterized in that, The first locking block has at least one first protrusion, which is adapted to be inserted into several slots on the upper cover of the handle to fix the position of the first push button seat.

20. The endoscopic surgical auxiliary traction forceps according to claim 18, characterized in that, The receiving cavity of the first push button seat has an inwardly extending first limiting portion.

21. The endoscopic surgical auxiliary traction forceps according to claim 1, characterized in that, The handle includes a stress diffusion tube that is connected to the sheath.

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