An endoscopic surgery assisted traction system and method

Abstract

The present invention discloses an endoscopic surgery auxiliary traction system and method. The system includes a traction forceps and a distal cap catheter. The distal cap catheter is adapted to provide independent instrument through channels for the endoscope and the traction forceps respectively. The distal cap catheter has a second bendable section, and the length of the second bendable section completely covers the bendable part of the endoscope. The traction forceps has a first bendable section, the first bendable section is adapted to bend bidirectionally and lock to maintain the bending angle, and the forceps head of the traction forceps is adapted to open and close and lock to maintain the open and closed state. In the present invention, the part of the distal cap catheter adjacent to and corresponding to the bendable part of the endoscope is also bendable, and the sheath of the traction forceps accommodated in the lumen of the bendable part is also bendable, so that the external channel served by the distal cap catheter can bend together with the endoscope, increasing the followability and reducing the required operating space.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an endoscopic surgery auxiliary traction system and method for assisting in pulling mucosal tissues during endoscopic surgery. Background Art

[0002] The dissection of the submucosal tissue of a lesion is the core part of the operation process of endoscopic submucosal dissection (ESD). The exposure of the surgical field between the mucosa and the submucosal tissue is the key to the safe and smooth progress of the operation. In order to make the ESD operation proceed more smoothly, some methods have been invented to assist the ESD operation, namely the auxiliary traction technology, and the "tissue clip traction method" is one of them.

[0003] For several known tissue forceps clamping and pulling methods, the tissue forceps are inserted into the digestive tract through different paths. After the circumferential pre-incision is completed, the tissue forceps are used to clamp and lift the mucosal layer to be dissected, fully exposing the submucosal layer to be dissected. The tissue forceps act as an auxiliary hand of the operator to lift the diseased mucosal layer to be dissected. Different operators use different methods for the tissue forceps to enter the digestive tract. Some use a double-channel endoscope, allowing the tissue forceps to pass through one of the endoscope channels; some use a single-channel endoscope, where the tissue forceps in the instrument channel extend out of the lens to grab another tissue forceps and enter the digestive tract together with the endoscope, and then the tissue forceps in the endoscope channel are withdrawn; there are also those that use an external channel of the endoscope, where the tissue forceps enter the digestive tract through the external channel. These solutions have their own advantages and disadvantages. For example, the "double-channel" has the advantage of being able to perform direct vision operations under the endoscope and being beneficial for large-area treatment, but the disadvantage is that the double-channel is too large in volume and the patient has to endure more pain. The method of using one tissue forceps to hold another and enter the human body, although it does not actually occupy the instrument channel, has a risk of damaging the human body during the entry process, and after the tissue forceps enter the digestive tract, due to the lack of connection with the endoscope, the operation is extremely difficult; moreover, the process of sending the tissue forceps into the digestive tract is cumbersome and not conducive to improving the surgical efficiency. The currently most ideal method should be the "external channel" method, which not only ensures a certain connection between the tissue forceps and the endoscope after entering the digestive tract, facilitating manipulation, but also provides an additional instrument channel, and can provide protection when the tissue forceps enter the human body. However, in the existing solutions, the external channel does not consider the followability of the channel corresponding to the bendable part of the endoscope after being connected to the endoscope. This results in that when the distal end of the endoscope actively bends, the external channel cannot bend well with the lens, and a large operating space is required for accurate positioning.

[0004] Chinese Patent Document CN214017647U discloses a mucosal traction device and an endoscopic system. The mucosal traction device includes a tube body, a first clip, and a traction member. The first clip is installed at the distal end of the tube body. The traction member is provided with a first acting portion and a second acting portion. The first acting portion acts on the distal end of the tube body, and the second acting portion is used to act 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 ends of the tube body and the endoscope can move independently. The endoscopic system includes the aforementioned mucosal traction device.

[0005] Chinese Patent Document CN102125459B discloses a mucosal tractor, including: an endoscope fixing portion capable of being installed at the distal head of the endoscope; an instrument lifting portion capable of installing a surgical instrument; a swing arm, one end of the swing arm is movably connected to the endoscope fixing portion, and the other end of the swing arm is movably connected to the instrument lifting portion; a traction portion, the distal end of the traction portion is connected to the instrument lifting portion.

[0006] For the above two, CN214017647U relies on a metal clip to clamp the diseased tissue, cannot independently control the traction angle, and only relies on the deflection of the distal end of the endoscope to locate the lesion; CN102125459B is a channel that relies on external force to deflect the lifting sleeve to achieve direction control, rather than the tissue forceps itself controlling the bending angle. Similarly, the traction angle cannot be accurately controlled, and the operation range is limited to the angle that the channel can reach.

[0007] In summary, the existing traction systems mainly have the following disadvantages:

[0008] 1. It is impossible to accurately control the tissue forceps to reach the lesion tissue precisely. Generally, the physician controls the deflection of the endoscope by experience, or the tissue forceps reach the lesion by squeezing the external channel to deform directionally by external force. The accuracy is not good, and it needs to be operated multiple times to achieve, resulting in low efficiency.

[0009] 2. During the process of grasping and pulling the lesion tissue, the bending angle of the tissue forceps cannot be self-locked, and the operator needs to control the bending state throughout the process. The operation difficulty is large, the work intensity is high, and the surgical efficiency is affected.

[0010] 3. The external channel does not consider the followability of the channel corresponding to the bendable part of the endoscope after being connected to the endoscope. This results in that when the distal end of the endoscope actively bends, the external channel cannot bend well with the lens, resulting in a large operation space required.

[0011] 4. When the tissue forceps grasp the lesion tissue, the forceps head needs to be completely extended out of the external channel. For the lesion tissue close to the lens, the lens needs to be moved before grasping, and the adaptability is poor. Summary of the Invention

[0012] The object of the present invention is to overcome the defects existing in the prior art, improve the follow-up performance of the tissue forceps relative to the endoscope, and add a locking function for the operating state of the tissue forceps, so as to achieve precise positioning to the lesion and perform endoscopic surgery quickly and efficiently.

[0013] To achieve the above object of the invention, in a first aspect, the present invention provides an endoscopic surgery auxiliary traction system, including a traction forceps and a tip cap catheter. The tip cap catheter is adapted to provide independent instrument through channels for the endoscope and the traction forceps respectively; the tip cap catheter has a second bendable section, and the length of the second bendable section completely covers the bendable part of the endoscope; the traction forceps has a first bendable section, the first bendable section is adapted to bend bidirectionally and lock to maintain the bending angle, and the forceps head of the traction forceps is adapted to open and close and lock to maintain the open and closed state.

[0014] Further, the tip cap catheter includes a tip cap, a second sheath tube and a connector connected in sequence. The connector is used to provide an opening for the traction forceps to enter the second sheath tube; there are at least two juxtaposed through channels in the tip cap, including a first through channel for connecting the second sheath tube and a second through channel for installing the endoscope, so that the second sheath tube and the endoscope are juxtaposed; the first through channel is used to pass the traction forceps, and the second bendable section is located at the distal end of the second sheath tube.

[0015] Further, a step protruding inward is provided in the second through channel, and the step is used to block the lens of the endoscope.

[0016] Further, there is a partition layer between a section at the starting end of the first through channel and a section at the starting end of the second through channel, forming a partition layer section. A section at the end of the first through channel and a section at the end of the second through channel are connected through a notch to form a notch section, and the partition layer section is adjacent to the notch section.

[0017] Further, the length of the notch section is greater than the distance between the step and the distal end face of the tip cap.

[0018] Further, the distal end of the first through channel on the tip cap is a bevel.

[0019] Further, the radial height of the bevel is greater than the inner diameter of the first through channel and does not exceed 1 / 2 of the height of the tip cap.

[0020] Further, there are a plurality of notches on the second bendable section.

[0021] Further, the notches penetrate the tube wall.

[0022] Further, a soft film is provided on the inner wall of the notches.

[0023] Further, a plurality of the notches extend axially and are arranged radially in the following manner: on the same radial cross-section, there are a plurality of notches arranged at intervals along the circumference; or, on the same radial cross-section, there is only one notch that does not cover the entire circumference; or, on the same radial cross-section, there is only one notch that covers the entire circumference; in the first two radial arrangement modes, the positions of the notches on adjacent radial cross-sections are the same or staggered.

[0024] Further, the second bendable section is a single-wall corrugated pipe; the outer wall of the single-wall corrugated pipe is: a sequentially progressive annular structure; or, a single spiral structure; or, a plurality of spiral structures.

[0025] Further, the traction forceps includes a forceps head, a first sheath tube, and a handle connected in sequence; the first sheath tube has the first bendable section, and a steering wire and a traction wire are accommodated and fixed in the first bendable section; one end of the steering wire is connected to the sheath tube bending control mechanism of the handle, and the sheath tube bending mechanism is adapted to realize the bidirectional bending of the first bendable section of the first sheath tube and lock and maintain the bending angle by bidirectionally pulling the steering wire; one end of the traction wire is connected to the forceps head opening and closing control mechanism of the handle, and the other end is connected to the forceps head, and the forceps head opening and closing control mechanism is adapted to realize the opening and closing of the forceps head and lock and maintain the opening and closing state by bidirectionally pulling the traction wire.

[0026] Further, the first bendable section of the first sheath tube is a multi-layer composite structure, which is, from outside to inside, a wrapper tube, an outer snake bone, a steering wire, a snake bone connecting tube, and an inner snake bone in sequence; the traction wire is accommodated and passes through the inner snake bone; both the outer snake bone and the inner snake bone are adapted to be bent bidirectionally.

[0027] Further, the outer snake bone is adapted to be bent 270° in both directions.

[0028] Further, the inner snake bone is adapted to be bent 180° in both directions.

[0029] Further, the proximal ends of the outer snake bone, the inner snake bone, and the snake bone connecting tube are fixedly connected axially; the inner snake bone remains in a freely movable state at the end close to the forceps head.

[0030] Further, the steering wire is axially arranged on both sides of the first sheath tube, and is adapted to bend the first sheath tube to different sides by pulling the steering wire on one side in the direction approaching the forceps head or away from the forceps head.

[0031] Further, the sheath tube bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably arranged in the middle of the lower cover of the handle, and the roller is fixedly arranged at the rear of the lower cover; the steering wire is fixed by the bending push button assembly and then extends to the roller, and is wound around the roller and then turns back closely.

[0032] Further, 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 arranged on the inner bottom surface of the lower cover, a second spring is accommodated in the second push-button seat, a second clamping block is provided on the top surface of the second spring, a second screw with its head facing upward is built in the second clamping block, and a second push button is screwed onto the second screw.

[0033] Further, the steering wire at least includes an upper-side steering wire and a lower-side steering wire, and the upper-side steering wire and the lower-side steering wire are separated or continuous with each other.

[0034] Further, when the upper-side steering wire and the lower-side steering wire are continuous with each other, a first steering wire scaling structure is provided on the second push-button seat, and the first steering wire scaling structure is adapted to simultaneously adjust the effective lengths of the upper-side steering wire and the lower-side steering wire.

[0035] Further, the first steering wire scaling structure includes an adjusting channel and an adjusting rod. The adjusting channel is a cavity and extends along the length direction of the lower cover. The adjusting rod perpendicularly penetrates through one side wall of the cavity from the outside to the inside in a direction perpendicular to the extending direction of the adjusting channel and is rotatably mounted on the other side wall in a bidirectional manner. A through hole is radially provided in the middle section of the adjusting rod; the adjusting channel serves as a threading and effective length scaling channel for the steering wire, and the steering wire directly winds around the adjusting rod for a certain number of turns or passes through the through hole and then winds around the adjusting rod for a certain number of turns.

[0036] Further, the steering wire sequentially includes an upper-side steering wire, an adjusting steering wire, and a lower-side steering wire, and the three are continuous with each other; a second steering wire scaling structure is provided on the second push-button seat, and the second steering wire scaling structure is adapted to respectively adjust the effective lengths of the upper-side steering wire and the lower-side steering wire in a bidirectional manner by scaling the length of the adjusting steering wire in a bidirectional manner.

[0037] Further, the second steering wire scaling structure includes an adjusting channel, a left adjuster, and a right adjuster. The adjusting channel is a cavity and extends along the length direction of the lower cover. The left adjuster and the right adjuster respectively perpendicularly penetrate through one side wall of the cavity from the outside to the inside in a direction perpendicular to the extending direction of the adjusting channel and are rotatably mounted on the other side wall in a bidirectional manner. Through holes are radially provided in the middle sections of the left adjuster and the right adjuster; the adjusting channel serves as a threading and effective length scaling channel for the steering wire, and the steering wire directly winds around the left adjuster and the right adjuster for a certain number of turns or passes through each of the through holes and then winds around the left adjuster and the right adjuster for a certain number of turns.

[0038] Further, the handle includes an upper cover, and a plurality of card slots are provided on the inner top surface of the upper cover; at least one second protrusion is provided on the second card block, and the second protrusion is adapted to be embedded in the card slot to fix the position of the second push button seat.

[0039] Further, a chute is provided on the upper cover, and the second push button extends out of the upper cover through the chute and is adapted to move back and forth along the chute.

[0040] Further, a guiding groove is provided on the upper cover, and the guiding groove is adapted to accommodate the steering wire and guide it.

[0041] Further, a guiding sleeve is provided in the guiding groove.

[0042] Further, a second limiting portion extending inward is provided at the opening of the accommodating cavity of the second push button seat.

[0043] Further, the clamping head opening and closing control mechanism includes a clamping push button assembly provided at the front part of the lower cover of the handle. The clamping push button assembly includes a first push button seat, and a traction wire fixing interface is provided on the first push button seat. The traction wire is fixed to the traction wire fixing interface; the first push button seat is slidably provided on the inner bottom surface of the lower cover, a first spring is accommodated in the first push button seat, a first card block is provided on the top surface of the first spring, a first screw with its head facing upward is built in the first card block, and a first push button is screwed on the first screw.

[0044] Further, at least one first protrusion is provided on the first card block, and the first protrusion is adapted to be embedded in a plurality of card slots on the upper cover of the handle to fix the position of the first push button seat.

[0045] Further, a first limiting portion extending inward is provided at the opening of the accommodating cavity of the first push button seat.

[0046] Further, the handle includes a stress diffusion tube, and the stress diffusion tube is docked with the first sheath tube.

[0047] Second aspect, the present invention provides an endoscopic surgery assisted traction method, including the following steps: inserting the lens of the endoscope into the second through-channel provided on the tip cap of the tip cap catheter; sending the tip cap and a part of the second sheath of the tip cap catheter into the target affected area together with the endoscope; deflecting the lens of the endoscope, and the second bendable section of the second sheath bends accordingly until the lens of the endoscope finds the target tissue; inserting the jaw of the traction forceps into the opening provided on the connector of the tip cap catheter and entering the first through-channel provided on the tip cap through the second sheath until the jaw is seen under the lens of the endoscope; adjusting the bending degree and / or bending direction of the first sheath of the traction forceps and the second sheath of the tip cap catheter by manipulating the handle of the traction forceps; adjusting the opening or closing of the jaw of the traction forceps by manipulating the handle of the traction forceps.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] 1. The front end of the traction forceps can achieve a two-way 180° bend and a 360° twist of the tube body, with a larger operating angle, which can cover a larger operating range, reduce the number of operations, and improve efficiency.

[0050] 2. When the front end of the traction forceps bends to an appropriate position, loosen the corresponding push button on the handle to lock the bending angle of the front end of the traction forceps. At this time, it is no longer necessary for the operator to continuously control to maintain this bending angle, reducing the operation difficulty and working intensity.

[0051] 3. The part of the tip cap catheter adjacent to and corresponding to the bent part of the endoscope is also a bendable part, and the sheath of the traction forceps accommodated in the lumen of this bendable part is also bendable, so that the external connection channel served by the tip cap catheter can bend along with the endoscope, increasing the followability and reducing the required operating space.

[0052] 4. The bendable section provided on the tip cap catheter and the bendable section of the traction forceps cooperate with each other. The bendable section of the traction forceps is located in the lumen of the bendable section of the tip cap catheter, so that the jaw does not need to completely extend out of the tip cap, which facilitates grasping tissues closer to the lens of the endoscope or grasping distant tissues to a proximal position from the lens for cutting. Description of the Drawings

[0053] Figure 1 It is a schematic structural diagram of an embodiment of the system of the present invention;

[0054] Figure 2 It is a schematic structural diagram of the traction forceps in an embodiment of the system of the present invention;

[0055] Figure 3 It is a schematic structural diagram of the tip cap catheter in an embodiment of the system of the present invention;

[0056] Figure 4 Schematic diagram of the structure of the tip cap in an embodiment of the system of the present invention;

[0057] Figure 5 Schematic diagram of the structure of the lower cover in an embodiment of the system of the present invention (including the sheath tube bending mechanism and the clamping head opening and closing control mechanism);

[0058] Figure 6 Schematic diagram of the structure of the clamping push button assembly of the clamping head opening and closing control mechanism in an embodiment of the system of the present invention;

[0059] Figure 7 Schematic diagram of the structure of the bending push button assembly of the sheath tube bending mechanism in an embodiment of the system of the present invention;

[0060] Figure 8 Schematic diagram of the structure of the upper cover in an embodiment of the system of the present invention;

[0061] Figure 9 Schematic diagram (cross-section) of the structure of the first sheath tube in an embodiment of the system of the present invention;

[0062] Figure 10 Usage state diagram of an embodiment of the system of the present invention;

[0063] Figure 11 Schematic diagram of the first scaling structure of the steering wire in an embodiment of the system of the present invention;

[0064] Figure 12 Schematic diagram of the second scaling structure of the steering wire in an embodiment of the system of the present invention;

[0065] Figure 13 Cross-sectional view of the tip cap in the prior art;

[0066] Figure 14 Cross-sectional view of the tip cap in an embodiment of the system of the present invention;

[0067] Figure 15 Usage state diagram of the tip cap in an embodiment of the system of the present invention.

[0068] In the figure:

[0069] 1 - Traction forceps; 11 - Forceps head; 12 - First sheath tube; 121 - Wrapping tube; 122 - Outer osteotomy; 1221 - Steering wire; 1221a - Upper side steering wire; 1221b - Lower side steering wire; 1221c - Adjusting section steering wire; 123 - Inner osteotomy; 124 - Osteotomy joint tube; 125 - Outer sheath tube; 126 - Inner tube; 127 - Traction wire; 13 - Handle; 131 - Upper cover; 1311 - Card slot; 1312 - Guide slot; 1313 - Slide slot; 132 - Lower cover; 133 - Clamping push button assembly; 1331 - First push button; 1332 - First push button seat; 13321 - First limiting part; 1333 - First clamping block; 13331 - First protrusion; 1334 - First spring; 1335 - First screw; 134 - Bending push button assembly; 1341 - Second push button; 1342 - Second push button seat; 13421 - Second limiting part; 1343 - Second clamping block; 13431 - Second protrusion; 1344 - Second spring; 1345 - Second screw; 1346 - Adjusting rod; 1347 - Left adjuster; 1348 - Right adjuster; 135 - Roller; 136 - Stress diffusion tube;

[0070] 2 - Tip cap catheter; 21 - Tip cap; 211 - First through channel; 212 - Second through channel; 2121 - Step; 213 - Notch; 214 - Inclined plane; 215 - Interlayer; 22 - Second sheath tube; 221 - Second bendable section; 2211 - Gap; 23 - Connector;

[0071] A - Endoscope. Detailed implementation mode

[0072] The following specific examples in conjunction with the accompanying drawings illustrate the implementation mode of the present invention. 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 implementation modes. 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.

[0073] It should be noted that the orientation words mentioned in this article, such as up, down, left, right, front, middle, back, bottom, top, inside, outside, etc., all refer to the orientation shown in the figure. This is for the convenience of description and does not constitute any limitation to the present invention.

[0074] Such as Figures 1 - 10As shown in the figure, an embodiment of the endoscopic surgery auxiliary traction system of the present invention includes a traction forceps 1 and a tip cap catheter 2. The tip cap catheter 2 is adapted to provide independent instrument through channels for the endoscope A and the traction forceps 1 respectively. The tip cap catheter 2 has a second bendable section 221, and the length of the second bendable section 221 completely covers the bendable part of the endoscope A. The traction forceps 1 has a first bendable section, which is adapted to bend bidirectionally and lock to maintain the bending angle, and the forceps head 11 of the traction forceps 1 is adapted to open and close and lock to maintain the open and closed state.

[0075] In this embodiment, the bendable part of the endoscope A and the second bendable section 221 of the tip cap catheter overlap in position and are bound together. The bendable part of the endoscope A is adjacent to the second bendable section 221 of the tip cap catheter side by side. As long as the bendable part of the endoscope A makes a bending movement, the second bendable section 221 of the tip cap catheter will necessarily bend accordingly, with good followability and effectively reducing the operation radius.

[0076] In one embodiment, the tip cap catheter 2 includes a tip cap 21, a second sheath 22 and a connector 23 connected in sequence. The connector 23 is used to provide an opening for the traction forceps 1 to enter the second sheath 22. The tip cap 21 has at least two through channels arranged side by side, including a first through channel 211 for connecting the second sheath 22 and a second through channel 212 for installing the endoscope A, so that the second sheath 22 and the endoscope A are arranged side by side. The first through channel 211 is used for passing the traction forceps 1, and the second bendable section 221 is located at the distal end of the second sheath 22. In this embodiment, the tip cap 21 is designed with a double-channel structure. In addition to the second through channel 212 for installing the endoscope A, an additional first through channel 211 is provided, which can be used as the instrument channel for the traction forceps 1, creating conditions for better auxiliary traction. The material of the tip cap 21 can be selected from soft polymer materials with certain elasticity such as silicone rubber and thermoplastic polyurethane elastomer, which can be stretched within a certain range, can cooperate with endoscope lenses of different specifications, and at the same time the soft material can ensure that the tissues in the patient's body are not damaged. The second sheath 22 connected to the tip cap 21 can be fixed to the endoscope A together with the tip cap 21, adding a channel to the endoscope A and facilitating the cooperative surgical operation of multiple instruments under the endoscope.

[0077] In one embodiment, a step 2121 protruding inwards is provided in the second through-channel 212, and the step 2121 is used to block the lens of the endoscope A. In this embodiment, the step 2121 is equivalent to a regulator for the penetration depth of the lens of the endoscope A in the second through-channel 212. The axial position of the step 2121 in the second through-channel 212 can be set according to actual needs. For different patients, the position of the lesion can be initially judged based on prior imaging information, and accordingly, the appropriate position of the step 2121 can be selected, that is, the tip cap 21 of different specifications can be selected.

[0078] In one embodiment, as Figures 14 - 15 shown, there is a partition layer 215 between a section at the starting end of the first through-channel 211 and a section at the starting end of the second through-channel 212, forming a partition layer section. A section at the end of the first through-channel 211 and a section at the end of the second through-channel 212 are connected and communicated through a notch 213, forming a notch section, and the partition layer section is adjacent to the notch section. In this embodiment, when the physician operates the traction forceps 1 to bend downwards, the bent part of the traction forceps 1 passes downwards through the notch 213, accommodating a part of the bent section of the traction forceps 1. Compared with Figure 13 the existing structure shown (there is no notch between the two channels, and the whole process is a partition layer), the forceps head 11 of the traction forceps 1 is closer to the instrument channel of the endoscope A, so that it is more convenient to cut the diseased tissue grasped by the forceps head 11 of the traction forceps 1 through the surgical tool in the instrument channel of the endoscope A. The notch 213 provided on the tip cap 21 cooperates with the traction forceps 1, so that a part of the bent part on the forceps head 11 of the traction forceps 1 is located in the tip cap 21, shortening the distance between the forceps head 11 and the lens of the endoscope A, and the operation can be carried out in a smaller space.

[0079] In one embodiment, the length of the notch section is greater than the distance between the step 2121 and the distal end face of the tip cap 21. In this embodiment, it is ensured that the opening position of the notch 213 is behind the endoscope lens, which has better adaptability to instruments such as flexible grasping forceps.

[0080] In one embodiment, as Figures 14 - 15 shown, the distal end of the first through-channel 211 on the tip cap 21 is a bevel 214. In this embodiment, the bevel 214 is located at the position on the tip cap 21 that is in direct contact with the human mucosa, which can change the force application direction to the mucosa and increase the force application area, so that the tip cap catheter 2 can more easily separate the mucosa when entering the human body along with the endoscope A, avoiding damage to human tissues, and solving the problem that the front end of the current tip cap is too flat and thus it is not easy to separate the mucosa without damage. At the same time, as Figure 15 shown, compared with Figure 13In the existing structure shown (without bevel, the movable range at the exit of the channel is small when the traction forceps B bends upward), when the physician operates the traction forceps 1 to bend upward, the movable range at the exit of the first through-channel 211 is large, so the accessible movable range of the forceps head 11 is larger, which is more conducive to quickly finding and grasping the diseased tissue.

[0081] In one embodiment, the radial height of the bevel 214 is greater than the inner diameter of the first through-channel 211 and does not exceed 1 / 2 of the height of the tip cap 21. In this embodiment, the height of the bevel 214 is greater than the inner diameter of the first through-channel 211, so that the "pointed" position formed by the bevel 214 and the notch 213 is lower in radial height than the "partition" between the first through-channel 211 and the second through-channel 212, facilitating the bending movement of instruments such as flexible grasping forceps. When the radial height of the bevel 214 is greater than 1 / 2 of the radial height of the tip cap 1, although the tissue can be separated, such acute angles may be unfavorable for the entry and exit of the instrument and operation, and may also affect the field of view.

[0082] In one embodiment, the second flexible section 221 has a plurality of slits 2211. In this embodiment, the multi-slit structure can enhance the flexibility of the second flexible section 221, making it easier to bend and having better followability.

[0083] In one embodiment, the slits 2211 penetrate the pipe wall. In this embodiment, after penetration, the deformation amount of the slits is large. During the bending process, the slits 2211 in the penetrated state have less resistance relative to the non-penetrated ones, that is, they are easier to bend and have better followability.

[0084] In one embodiment, a soft film is provided on the inner wall of the slits 2211. In this embodiment, when the traction forceps 1 moves in the inner cavity of the tip cap catheter 2, it may extend to the outside of the slits 2211 in the penetrated state, that is, deviate to the outside of the inner cavity of the tip cap catheter 2, resulting in the failure of the traction forceps 1 to pass through. In order to ensure that the traction forceps 1 always moves in the inner cavity of the tip cap catheter 2, a soft film is provided on the inner wall of each slit 2211 to cover the penetrated through-hole. At this time, the soft film actually plays a guiding role, that is, it can effectively ensure that the traction forceps 1 smoothly passes through in the inner cavity of the tip cap catheter 2. The soft film covers the slits inside the pipe body, and the outer slits still exist. It is easier to process in the penetrated state, but the passing performance of the instrument is not good. At this time, installing a soft film on the inner side of the pipe wall is equivalent to a whole complete pipe, with better guiding performance, which is equivalent to optimizing the passing performance of the instrument. Compared with the non-penetrated state, the bending performance is better. Since the non-penetrated pipe wall is a whole, the material is harder than the soft film, and the pulling force on the slits during bending is stronger, and the bending property is not as good as that of the soft film.

[0085] In one embodiment, a plurality of the notches 2211 extend axially and are arranged radially in the following manners: in the same radial cross-section, there are a plurality of notches 2211 arranged at intervals along the circumference; alternatively, in the same radial cross-section, there is only one notch 2211 that does not cover the entire circumference; alternatively, in the same radial cross-section, there is only one notch 2211 that covers the entire circumference; in the first two radial arrangement manners, the positions of the notches 2211 in adjacent radial cross-sections are the same or staggered. In this embodiment, in the first radial arrangement manner, a plurality of notches 2211 are arranged at the same or different angles at intervals on the same circumference, so that it can be easily bent in multiple directions, that is, it has multi-directional or omnidirectional follow-up performance; in the second radial arrangement manner, only one notch 2211 is provided on the same circumference, and the notch 2211 can be provided only in the direction where bending is required. In this way, it can be easily bent in the direction where the notch 2211 is located and can also be easily bent in the direction opposite to the notch 2211; the third radial arrangement manner is equivalent to connecting a plurality of notches 2211 arranged at intervals into a continuous notch on the basis of the first manner, and has better omnidirectional follow-up performance.

[0086] In one embodiment, the second bendable section 221 is a single-wall corrugated pipe; the outer wall of the single-wall corrugated pipe is: a sequentially progressive annular structure; or, a single spiral structure; or, a plurality of spiral structures. In this embodiment, the single-wall corrugated pipe is equivalent to having continuous notches on its outer wall and has good follow-up performance.

[0087] In one embodiment, the traction forceps 1 includes a forceps head 11, a first sheath 12, and a handle 13 that are sequentially connected; the first sheath 12 has the first bendable section, and a steering wire 1221 and a traction wire 127 are accommodated and fixed in the first bendable section; one end of the steering wire 1221 is connected to the sheath bending control mechanism of the handle 13, and the sheath bending mechanism is adapted to achieve bidirectional bending of the first bendable section of the first sheath 12 and lock and maintain the bending angle by bidirectionally pulling the steering wire 1221; one end of the traction wire 127 is connected to the forceps head opening and closing control mechanism of the handle 13, and the other end is connected to the forceps head 11, and the forceps head opening and closing control mechanism is adapted to achieve the opening and closing of the forceps head 11 and lock and maintain the opening and closing state by bidirectionally pulling the traction wire 127. In this embodiment, a sheath bending control mechanism is provided in the handle 13 of the traction forceps 1 to control the bending angle and bending direction of the first bendable section of the first sheath 12, and it can be bent in a certain direction as needed and adjusted to an appropriate bending angle. After the adjustment is in place, it can be locked and maintained at this bending angle, and there is no need for manual holding of a certain part all the time to maintain the bending angle, which saves time and effort and is convenient and fast; similarly, a forceps head opening and closing control mechanism is provided in the handle 13 of the traction forceps 1 to control the opening or closing of the forceps head 11 and can lock the opening or closing state, that is, if it is in the closed state, it will always remain closed, and if it is in the open state, the opening size will remain unchanged, without the need for manual maintenance. A bidirectional bending angle mark can be set on the side of the sheath bending control mechanism of the handle 13 to make the control of the bending angle more explicit.

[0088] In one embodiment, the first bendable section of the first sheath 12 is a multi-layer composite structure, which is sequentially composed of a tube 121, an outer osteotomy 122, a steering wire 1221, an osteotomy connecting tube 124, and an inner osteotomy 123 from outside to inside; the traction wire 127 is accommodated and passes through the inner osteotomy 123; both the outer osteotomy 122 and the inner osteotomy 123 are adapted to bidirectional bending. In this embodiment, the osteotomy connecting tube 124 is connected to the inner osteotomy 123 and the outer osteotomy 122 at the proximal end, and enables the steering wire 1221 provided on the outer osteotomy 122 to pass through the gap between the inner osteotomy 123 and the outer osteotomy 122. The materials of the outer osteotomy 122 and the inner osteotomy 123 can be selected from stainless steel, nitinol alloy or other metal materials. The traction wire 127 can be sheathed with a tube to reduce friction, and the material is PTFE or other polymer materials. Such as Figure 9As shown, the first sheath tube 12 further includes a common section, which includes an outer sheath tube 125 and an inner tube 126. The inner tube 126 is connected to the outer snake bone 122. The inner tube 126 is in the form of a flexible snake bone or a spring tube, and its material is stainless steel, NiTi alloy or other metal materials. The covering tube 121 covers the outside of the outer snake bone 122, and the outer sheath tube 125 covers the outside of the inner tube 126. The material of the outer sheath tube 125 is a polymer material with high lubricity, and the material of the covering tube 121 is a polymer material with high elasticity. In this embodiment, when the outer snake bone 122 is in a bent state and the operating jaw 11 is closed, pulling the traction wire 127 in the direction away from the jaw 11 will cause the traction wire 127 to closely adhere to the inner wall of the inner snake bone 123. At this time, due to the locking structure (not shown in the figure, which belongs to the prior art) provided on the inner snake bone 123, the inner snake bone 123 provides support for the traction wire 127, thus avoiding affecting the bending state of the outer snake bone 122 and solving the problem of mutual interference between the opening and closing of the jaw 11 and the bending angle. The tip of the traction forceps 1 adopts a snake bone structure, and it can easily achieve a two-way 180° bending of the head. The inner snake bone 123 can effectively reduce the deformation or manipulation interference caused by the force of the traction wire 127 on the outer snake bone 122 when the jaw 11 opens and closes.

[0089] In one embodiment, the outer snake bone 122 is adapted to bend 270° in each of the two opposite directions. In this embodiment, the outer snake bone 122 can be bent up to 270° at most in two opposite directions respectively. The outer snake bone 122 is directly adjacent to or in contact with the bendable part of the endoscope A. Its large bendable angle will inevitably make the followability of the entire first sheath tube 12 better.

[0090] In one embodiment, the inner snake bone 123 is adapted to bend 180° in each of the two opposite directions. In this embodiment, the inner snake bone 123 can be bent up to 180° at most in two opposite directions respectively, so as to better match the outer snake bone 122 and improve the followability of the entire first sheath tube 12.

[0091] In one embodiment, the outer snake bone 122, the inner snake bone 123 and the snake bone connection tube 124 are fixedly connected at their axial proximal ends; the inner snake bone 123 is in a freely movable state at the end close to the jaw 11. In this embodiment, the proximal ends (the end close to the handle 13, also called the rear end) of the outer snake bone 122 and the inner snake bone 123 are connected by the snake bone connection tube 124. The outer snake bone 122 and the inner snake bone 123 at the distal end (the end far from the handle 13, also called the front end) can move relative to each other. When the outer snake bone 122 is bent under force, it drives the inner snake bone 123 to bend. Due to the proximal end being fixed, the bending angle of the inner snake bone 123 is smaller than that of the outer snake bone 122, so the front end of the inner snake bone 123 extends forward relative to the outer snake bone 122, and there is a gap within 5 mm between the front end of the inner snake bone 123 and the inner bottom of the jaw 11. This reserved gap is filled by the forward-extending inner snake bone 123 during bending.

[0092] In one embodiment, the steering wires 1221 are axially disposed on both sides of the first sheath tube 12 and are adapted to bend the first sheath tube 12 to different sides by pulling one of the steering wires 1221 in a direction approaching the jaw 11 or away from the jaw 11. In this embodiment, the steering wires 1221 are a continuous integral body and are disposed on both sides of the first sheath tube 12. Different bending directions of the first sheath tube 12 can be achieved by applying external forces in different directions to one of the steering wires 1221. It should be noted that only the head end of the steering wire 221 is connected to the front end of the outer osteotomy 22. The steering wire 221 passes through the raised holes provided in the inner wall of the outer osteotomy 22. When the steering wire 221 is pulled, the steering wire 221 slides relative to the outer osteotomy 22 to a certain extent. During this process, the length of the steering wire 221 in the outer osteotomy 22 becomes shorter, and the outer osteotomy 22 will be bent. It should be noted that the purpose of this bending is to fine-tune the position after the endoscope A has been bent to an appropriate position, so that the jaw 11 can approach the tissue to be resected more accurately.

[0093] In one embodiment, the sheath tube bending control mechanism includes a bending push button assembly 134 and a roller 135; the bending push button assembly 134 is slidably disposed in the middle of the lower cover 132 of the handle 13, and the roller 135 is fixedly disposed at the rear of the lower cover 132; the steering wire 1221 extends to the roller 135 after being fixed by the bending push button assembly 134 and is wound around the roller 135 and then turns back. In this embodiment, the steering wires 1221 are distributed on both sides of the lower cover 132 after being guided and turned back by the roller 135, which exactly corresponds to the distribution of the steering wires 1221 on both sides of the first sheath tube 12 in the previous embodiment; the steering wire 1221 is fixed on the bending push button assembly 134. As the bending push button assembly 134 moves, the steering wire 1221 will inevitably be pulled. As Figure 5 shown, the bending push button assembly 134 can move to the left or to the right. Different moving directions result in different force directions of the steering wire 1221, and finally the steering wire 1221 in the first sheath tube 12 drives the first sheath tube 12 to bend to different sides.

[0094] In one embodiment, as Figure 5 and Figure 7As shown, the bending push button assembly 134 includes a second push button seat 1342. A steering wire fixing interface is provided on the second push button seat 1342, and the steering wire 1221 is fixed to the steering wire fixing interface. The second push button seat 1342 is slidably disposed on the inner bottom surface of the lower cover 132. A second spring 1344 is accommodated in the second push button seat 1342. A second block 1343 is provided on the top surface of the second spring 1344. A second screw 1345 with its head facing upward is built in the second block 1343, and a second push button 1341 is screwed onto the second screw 1345. In this embodiment, two steering wire fixing interfaces a and b are provided on the second push button seat 1342. The steering wire 1221 enters from interface a and exits from interface b. The steering wire 1221 is fixed to the second push button seat 1342, that is, there is no relative movement between the two. From Figure 5 It can be seen that the positions of interfaces a and b, that is, the position of the left steering wire 1221 is significantly higher than that of the right steering wire 1221. Then Figure 5 the extended left steering wire 1221 in Figure 5 is located on the upper side inside the first sheath 12. Figure 5 the extended right steering wire 1221 in Figure 5 is located on the lower side inside the first sheath 12. Pushing the second push button 1341 to the left or right can make the second push button seat 1342 slide to the left or right, so that Figure 5 the left steering wire 1221 in Figure 5 is subjected to a left or right pulling force. Specifically, if the second push button 1341 is pushed to the left (i.e., in the direction approaching the jaw 11, or called forward movement), then Figure 5 the right part of the left steering wire 1221a at interface b in Figure 5 is subjected to a left pulling force, and the right steering wire 1221b after being wound and folded back by the roller 135 is subjected to a right pulling force. Then the lower steering wire 1221b inside the first sheath 12 is subjected to a right pulling force, and the outer osteotomy 122 is pulled to the right by the lower steering wire 1221b and bends downward. The inner osteotomy 123 is deformed and squeezed by the outer osteotomy 122 and bends in the same direction as the outer osteotomy 123. Conversely, if the second push button 1341 is pushed to the right (i.e., in the direction away from the jaw 11, or called backward movement), then Figure 5 the left part of the left steering wire 1221a at interface a in Figure 5 is subjected to a right pulling force. Then the upper steering wire 1221a inside the first sheath 12 is subjected to a right pulling force, and the outer osteotomy 122 is pulled to the right by the upper steering wire 1221a and bends upward. The inner osteotomy 123 is deformed and squeezed by the outer osteotomy 122 and bends in the same direction as the outer osteotomy 123. In this embodiment, by winding and folding back through the roller 135 to change the force application direction, the two-way bending of the first sheath 12 is cleverly realized. The bending angle is related to the moving distance of the second push button 1341 and can be determined according to actual needs. The roller 135 connects the steering wire 1221 and the second push button 1341, with better synchronism. While one side of the steering wire is tightened, the other side of the steering wire is relaxed.

[0095] In one embodiment, as Figure 5 shown, the steering wire 1221 at least includes an upper steering wire 1221a and a lower steering wire 1221b, and the upper steering wire 1221a and the lower steering wire 1221b are separated or continuous from each other. In this embodiment, if the upper steering wire 1221a and the lower steering wire 1221b are separated from each other, that is, they are disconnected, one end of the upper steering wire 1221a stops at the steering wire fixing interface a, and one end of the lower steering wire 1221b stops at the steering wire fixing interface b. If the upper steering wire 1221a and the lower steering wire 1221b are continuous from each other, that is, they are connected together and are an integral body, there is a cavity between the steering wire fixing interface a and the steering wire fixing interface b for the steering wire 1221 to pass through, but the steering wire 1221 is fixed at the two points of the steering wire fixing interface a and the steering wire fixing interface b. This design that can be either separated or continuous can increase the flexibility of the use of the steering wire 1221. Especially in the continuous state, the effective lengths of the upper steering wire 1221a and / or the lower steering wire 1221b can be conveniently adjusted. The so-called effective length refers to the actual length participating in the bending operation.

[0096] In one embodiment, as Figure 11 shown, when the upper steering wire 1221a and the lower steering wire 1221b are continuous from each other, a first steering wire scaling structure is provided on the second push button seat 1342, and the first steering wire scaling structure is adapted to simultaneously adjust the effective lengths of the upper steering wire 1221a and the lower steering wire 1221b. In this embodiment, as the first steering wire scaling structure on the second push button seat 1342 acts, the effective lengths of the upper steering wire 1221a and the lower steering wire 1221b can be adjusted simultaneously, and then the tightness of the whole device is adjusted accordingly, including the state of the clamp head 11 in the non-bending state: loose or tight.

[0097] In one embodiment, as Figure 11As shown in (a)-(c), the first scaling structure of the steering wire includes an adjustment channel and an adjustment rod 1346. The adjustment channel is a cavity and extends along the length direction of the lower cover 132. The adjustment rod 1346 perpendicularly penetrates one side wall of the cavity from the outside into the cavity along a direction perpendicular to the extension direction of the adjustment channel and is rotatably mounted on the other side wall in a bidirectional manner. A through hole is radially formed in the middle section of the adjustment rod 1346. The adjustment channel serves as a passage for the steering wire 1221 to pass through and a channel for scaling the effective length. The steering wire 1221 directly winds around the adjustment rod 1346 for a certain number of turns or passes through the through hole and then winds around the adjustment rod 1346 for a certain number of turns. In this embodiment, the adjustment rod 1346 can be a dumbbell-shaped screw, with a cross slot on the head end face, a slightly narrower middle section, a thread at the tail end that can cooperate with the other side wall of the cavity, and a through hole in the middle section. A tool can be inserted into the cross slot to rotate the adjustment rod 1346 counterclockwise or clockwise. The steering wire 1221 can pass through the through hole of the adjustment rod 1346 and then wind, or it can wind directly without passing through the through hole. When using the former winding method, when rotating the adjustment rod 1346, whether rotating counterclockwise or clockwise, the effective length of the upper steering wire 1221a shortens, and the effective length of the lower steering wire 1221b shortens when rotating clockwise and lengthens when rotating counterclockwise. When using the latter winding method, when rotating the adjustment rod 1346 clockwise, the effective length of the upper steering wire 1221a shortens, and the effective length of the lower steering wire 1221b lengthens. When rotating the adjustment rod 1346 counterclockwise, the situation is completely opposite, that is, the effective length of the upper steering wire 1221a lengthens, and the effective length of the lower steering wire 1221b shortens. Multiple scaling adjustment methods increase the flexibility of use and can be selected according to actual needs.

[0098] In one embodiment, as Figure 12 shown, the steering wire 1221 sequentially includes an upper steering wire 1221a, an adjustment steering wire 1221c, and a lower steering wire 1221b, which are continuous with each other. A second scaling structure of the steering wire is provided on the second push button seat 1342. The second scaling structure of the steering wire is adapted to respectively adjust the effective lengths of the upper steering wire 1221a and the lower steering wire 1221b in a bidirectional manner by scaling the length of the adjustment steering wire 1221c in a bidirectional manner. In this embodiment, the adjustment steering wire 1221c is a reserved section located between the upper steering wire 1221a and the lower steering wire 1221b for adjusting the effective lengths on both sides of it, which increases the flexibility of use.

[0099] In one embodiment, as Figure 12As shown in (a)-(c), the second scaling structure of the steering wire includes an adjustment channel, a left adjuster 1347 and a right adjuster 1348. The adjustment channel is a cavity and extends along the length direction of the lower cover 32. The left adjuster 1347 and the right adjuster 1348 respectively penetrate one side wall of the cavity from the outside to the inside perpendicular to the extension direction of the adjustment channel and are rotatably installed on the other side wall in a bidirectional manner. Through holes are radially formed in the middle sections of the left adjuster 1347 and the right adjuster 1348. The adjustment channel serves as a passage for the steering wire 1221 to pass through and a channel for scaling the effective length. The steering wire 1221 directly winds around the left adjuster 1347 and the right adjuster 1348 for a certain number of turns respectively, or passes through each through hole and then winds around the left adjuster 1347 and the right adjuster 1348 for a certain number of turns respectively. In this embodiment, the entire steering wire 1221 is divided into three sections by two adjusters, namely, an upper steering wire 1221a for controlling the bending direction of the jaw 11, a lower steering wire 1221b, and an adjustment steering wire 1221c located between the two adjusters. The left adjuster 1347 can adjust the effective length of the upper steering wire 1221a, and the right adjuster 1348 can adjust the effective length of the lower steering wire 1221b. Similar to the embodiment of the above first scaling structure, the adjustment effects of different winding methods are different. It should be noted that when the method of passing through the through hole and then winding is adopted, as Figure 12 As shown in (b)-(c), by rotating the horizontal groove at the head of the adjuster, the position of the through hole on the adjuster through which the steering wire 1221 passes is opened (the axial direction of the through hole is parallel to the axial direction of the adjustment channel) or closed (the axial direction of the through hole is perpendicular to the axial direction of the adjustment channel) relative to the adjustment channel, similar to the opening and closing of a valve, so as to control the steering wire 221 passing through it to be in a locked state (see Figure 12 (c)) or a relaxed state (see Figure 12 (b)). By adjusting the length of the upper steering wire 1221a and selecting the adjuster to be in the closed state, the tightening and loosening state of the upper steering wire 1221a can be adjusted. By adjusting the length of the lower steering wire 1221b and selecting the adjuster to be in the closed state, the tightening and loosening state of the lower steering wire 1221b can be adjusted. By adjusting the lengths of the upper steering wire 1221a and the lower steering wire 1221b and selecting both adjusters to be in the closed state, the tightening and loosening state of the steering wire of the entire system can be adjusted. At the same time, due to the linkage effect between the steering wire 1221 and the second push button seat 1342, the force for controlling the bending push button assembly 134 is also changed accordingly, thereby changing the bending degree of the associated part.

[0100] In one embodiment, as Figure 8As shown, the handle 13 includes an upper cover 131, and a plurality of card slots 1311 are provided on the inner top surface of the upper cover 131; at least one second protrusion 13431 is provided on the second card block 1343, and the second protrusion 13431 is adapted to be embedded in the card slot 1311 to fix the position of the second push button seat 1342. In this embodiment, the cooperation of the second protrusion 13431 and the card slot 1311 realizes the locking of the moving distance of the second push button 1341 in the previous embodiment, that is, the bending angle of the first sheath 12 is locked. It should be noted that the plurality of card slots 1311 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. Combining with the previous embodiment, before pushing the second push button 1341, it is necessary to first hold down its top. At this time, the second spring 1344 below it is compressed, and its height is reduced, so that the second protrusion 13431 on it is disengaged from the card slot 1311, and thus it can move freely. After the second push button 1341 moves in place, then release the hand from its top, and it rises under the elastic force of the second spring 1344, so that the second protrusion 13431 on it is embedded in the card slot 1311 to realize position locking.

[0101] In one embodiment, as Figure 8 shown, a sliding groove 1313 is provided on the upper cover 131, and the second push button 1341 extends out of the upper cover 131 through the sliding groove 1313 and is adapted to move back and forth along the sliding groove 1313. In this embodiment, the sliding groove 1313 provides a space for the left and right movement of the second push button 1341, and the movable distance of the second push button 1341 can be changed by changing the length of the sliding groove 1313, that is, the bendable angle of the first sheath 12 is set. The length of the sliding groove 1313 is generally the same as the total arrangement length of the plurality of card slots 1311.

[0102] In one embodiment, as Figure 8 shown, a guiding groove 1312 is provided on the upper cover 131, and the guiding groove 1312 is adapted to accommodate the steering wire 1221 and guide it. In this embodiment, the guiding groove 1312 limits the position and movement trajectory of the steering wire 1221, so as to prevent the steering wire 1221 from shifting in position during the stressed state and the moving process, which affects the accuracy of the bending angle control. The outer top surface of the upper cover 131 can be covered with soft glue to prevent foreign objects from entering and affecting the operation.

[0103] In one embodiment, a guiding sleeve is provided in the guiding groove 1312. In this embodiment, the guiding sleeve can reduce the frictional resistance of the steering wire 1221. The material of the guiding sleeve can be a polymer material with high lubrication performance.

[0104] In one embodiment, as Figure 7As shown, the opening of the receiving cavity of the second push button seat 1342 has a second limiting portion 13421 extending inward. In this embodiment, the second limiting portion 13421 can effectively prevent the second latch 1343 from disengaging from the second push button seat 1342.

[0105] In one embodiment, as Figure 5 and Figure 6 shown, the jaw opening and closing control mechanism includes a clamping push button assembly 133 provided at the front part of the lower cover 132 of the handle 13. The clamping push button assembly 133 includes a first push button seat 1332. A traction wire fixing interface c is provided on the first push button seat 1332, and the traction wire 127 is fixed to the traction wire fixing interface c. The first push button seat 1332 is slidably disposed on the inner bottom surface of the lower cover 132. A first spring 1334 is received in the first push button seat 1332. A first latch 1333 is provided on the top surface of the first spring 1334. A first screw 1335 with its head facing upward is built in the first latch 1333, and a first push button 1331 is screwed onto the first screw 1335. In this embodiment, the traction wire 127 is fixed to the traction wire fixing interface c, that is, there is no relative movement between the two. Pushing the first push button 1331 to the left or right can make the first push button seat 1332 slide to the left or right, so that the traction wire 127 is subjected to a left or right pulling force. Specifically, if the first push button 1331 is pushed to the left (i.e., in the direction approaching the jaw 11, or called forward movement), the traction wire 127 is subjected to a leftward thrust, and the jaw 11 connected to the traction wire 127 is pushed to open. On the contrary, if the first push button 1331 is pushed to the right (i.e., in the direction away from the jaw 11, or called backward movement), the traction wire 127 is subjected to a rightward pulling force, and the jaw 11 connected to the traction wire 127 is pulled to close. The first push button 1331 and the second push button 1341 can be independently operated, and they do not interfere with each other, and can be used in single-handed operation occasions.

[0106] In one embodiment, the first clamping block 1333 has at least one first protrusion 13331, and the first protrusion 13331 is adapted to be embedded in a plurality of card slots 1311 on the upper cover 131 of the handle 13 to fix the position of the first push button seat 1332. In this embodiment, the cooperation between the first protrusion 13331 and the card slots 1311 realizes the locking of the moving distance of the first push button 1331 in the previous embodiment, that is, the opening or closing state of the clamping head 11 is locked. When it is opened, the size of the opening is locked, and when it is closed, the closing degree is locked, that is, the size of the remaining opening, which is collectively referred to as the opening and closing degree. It should be noted that the plurality of card slots 1311 are arranged at equal intervals, and the size of the interval is related to the adjustment accuracy of the opening and closing degree of the clamping head 11. The smaller the interval, the higher the adjustment accuracy. Combining with the previous embodiment, before pushing the first push button 1331, it is necessary to first press its top. At this time, the first spring 1334 below it is compressed, and its height is reduced, so that the first protrusion 13331 on it is disengaged from the card slot 1311, and thus it can move freely. After the first push button 1331 moves in place, then release the hand from its top, and it rises under the elastic force of the first spring 1334, so that the first protrusion 13331 on it is embedded in the card slot 1311 to achieve position locking.

[0107] In one embodiment, the orifice of the accommodating cavity of the first push button seat 1332 has a first limiting portion 13321 extending inward. In this embodiment, the first limiting portion 13321 can effectively prevent the first clamping block 1333 from disengaging from the first push button seat 1332.

[0108] In one embodiment, the handle 13 includes a stress diffusion tube 136, and the stress diffusion tube 136 is docked with the first sheath tube 12. In this embodiment, the stress diffusion tube 136 can disperse the stress between the first sheath tube 12 and the handle 13, and effectively prevent the first sheath tube 12 from deforming at the connection part.

[0109] An embodiment of the endoscopic surgery assistance traction method of the present invention includes the following steps: (1) Insert the lens of endoscope A into the second through-channel 212 provided on the tip cap 21 of the tip cap catheter 2; (2) Send the tip cap 21 and a part of the second sheath 22 of the tip cap catheter 2 into the target affected area together with endoscope A; (3) Deflect the lens of endoscope A, and the second bendable section 221 of the second sheath 22 bends accordingly until the lens of endoscope A finds the target tissue; (4) Insert the forceps head 11 of the retractor forceps 1 into the opening provided on the connector 23 of the tip cap catheter 2, and enter the first through-channel 211 provided on the tip cap 21 through the second sheath 22 until the forceps head 11 is seen under the lens of endoscope A; (5) Adjust the bending degree and / or bending direction of the first sheath 12 of the retractor forceps 1 and the second sheath 22 of the tip cap catheter 2 by operating the handle 13 of the retractor forceps 1; (6) Adjust the opening or closing of the forceps head 11 of the retractor forceps 1 by operating the handle 13 of the retractor forceps 1.

[0110] In one embodiment, the operation can be specifically carried out according to the following process:

[0111] S1. Insert the lens of endoscope A into the second through-channel 212 provided on the tip cap 21 until the lens of endoscope A is blocked by the step 2121.

[0112] S2. Send the tip cap 21 and a part of the second sheath 22 into the target affected area together with endoscope A, and thus complete the establishment of the additional instrument channel.

[0113] S3. When the lens of endoscope A deflects, the tip cap 21 moves with endoscope A to drive the notch 2211 on the second bendable section 221 to deform, and the second bendable section 221 changes direction with endoscope A until the lens of endoscope A finds the target tissue.

[0114] S4. Insert the forceps head 11 of the retractor forceps 1 and a part of the first sheath 12 into the opening provided on the connector 23 of the tip cap catheter 2, and pass through the second sheath 22 until the forceps head 11 can be seen under the lens of endoscope A.

[0115] S5. Operate the handle 13 of the retractor forceps 1. Move the handle 13 relative to the tip cap catheter 2, then the first sheath 12 drives the forceps head 11 to move back and forth; rotate the handle 13, drive the first sheath 12 to rotate, and further drive the forceps head 11 to rotate until the forceps head 11 is in the appropriate position.

[0116] S6. Operate 13 of the traction forceps 1, press down the second push button 1341, the second screw 1345 drives the second clamping block 1343 to move downward, the second spring 1344 is compressed, the second protrusion 13431 on the second clamping block 1343 disengages downward from the clamping groove 1311 of the upper cover 131. Press and hold the second push button 1341 and push it towards the forceps head 11 direction, the second push button seat 1342 moves forward, the steering wire 1221b connected to the interface b is pulled to move forward. Due to the guiding effect of the roller 135, the steering wire 1221b near the lower part inside the actual outer snake bone 122 moves backward, and the outer snake bone 122 is deformed by the pulling of 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 bent to an appropriate angle, the operator releases the second push button 1341, the second spring 1344 built in the second push button seat 1342 rebounds, pushes the second clamping block 1343 upward back into the clamping groove 1311 at the corresponding position, the second clamping block 1343 cooperates with the clamping groove 1331 to fix the bending push button assembly 134, and further fixes the position of the steering wire 1221b relative to the outer snake bone 122, locking to keep the bending angle unchanged.

[0117] S7. Press down the second push button 1341, the second screw 1345 drives the second clamping block 1343 to move downward, the second spring 1344 is compressed, the second protrusion 13431 on the second clamping block 1343 disengages downward from the clamping groove 1311 of the upper cover 131. Press and hold the second push button 1341 and push it in the direction away from the forceps head 11, the second push button seat 1342 moves backward, the steering wire 1221a connected to the interface a is pulled to move backward, the steering wire 1221b connected to the interface b moves backward. After being guided by the roller 135, the steering wire 1221b moves forward. For the outer snake bone 122, the upper side steering wire 1221a is tightened, the lower side steering wire 1221b is relaxed, and the outer snake bone 122 bends upward in the direction of the tightened steering wire, that is, upward. 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 bent to an appropriate angle, the operator releases the second push button 1341, the second spring 1344 built in the second push button seat 1342 rebounds, pushes the second clamping block 1343 upward back into the clamping groove 1311 at the corresponding position, the second clamping block 1343 cooperates with the clamping groove 1331 to fix the bending push button assembly 134, and further fixes the position of the steering wire 1221 relative to the outer snake bone 122, locking to keep the bending angle unchanged.

[0118] S8. Press the first push button 1331 downward, the first screw 1335 drives the first clamping block 1333 to move downward, the first spring 1334 is compressed, the first protrusion 13331 on the first clamping block 1333 is disengaged downward from the clamping slot 1311 of the upper cover 131, the first push button 1331 is pressed and pushed in the direction of the pliers head 11, the first push button seat 1332 pushes the traction wire 127 forward, and the traction wire 127 pushes the pliers head 11 to open. When it is opened to the appropriate position, the operator releases the first push button 1331, the first spring 1334 rebounds, and the first clamping block 1333 is pushed back to the corresponding position of the clamping slot 1311, the first clamping block 1333 cooperates with the clamping slot 1331, fixes the clamping push button assembly 133, and then fixes the position of the traction wire 127 relative to the pliers head 11, and locks and keeps the open position of the pliers head 11 unchanged, that is, the opening size remains unchanged.

[0119] S9. Press the first push button 1331 downward, the first screw 1335 drives the first clamping block 1333 to move downward, the first spring 1334 is compressed, the first protrusion 13331 on the first clamping block 1333 is disengaged downward from the clamping slot 1311 of the upper cover 131, the first push button 1331 is pressed and pushed away from the pliers head 11, the first push button seat 1332 pushes the traction wire 127 to move backward, and the traction wire 127 pulls the pliers head 11 to close. When closed to the appropriate position, the operator releases the first push button 1331, the first spring 1334 rebounds, and the first clamping block 1333 is pushed back to the corresponding position of the clamping slot 1311, the first clamping block 1333 cooperates with the clamping slot 1331, fixes the clamping push button assembly 133, and then fixes the position of the traction wire 127 relative to the pliers head 11, and locks and keeps the closed position of the pliers head 11 unchanged, that is, the remaining opening size remains unchanged. When the outer serpentine bone 122 is in a bent state and the pliers head 11 is operated to close, the traction wire 127 is pulled away from the pliers head, which will make the traction wire 127 close to the inner wall of the inner serpentine bone 123. Due to the locking structure provided on the inner serpentine bone 123 at this time, the inner serpentine bone supports the traction wire 127, thereby avoiding affecting the bending state of the outer serpentine bone 122 and solving the problem of interference between the opening and closing of the pliers head 11 and the bending angle.

[0120] S10. According to actual needs, two or more steps in the above S4-S9 are continuously repeated to achieve the endoscopic surgery auxiliary traction function.

[0121] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An endoscopic surgery assisted traction system, characterized in that, it includes a traction forceps and a tip cap catheter, and the tip cap catheter is adapted to provide independent instrument through channels for an endoscope and the traction forceps respectively; the tip cap catheter has a second bendable section, and the length of the second bendable section completely covers the bendable part of the endoscope; the traction forceps has a first bendable section, the first bendable section is adapted to bend bidirectionally and lock to maintain the bending angle, and the forceps head of the traction forceps is adapted to open and close and lock to maintain the open and closed state; the traction forceps includes a forceps head, a first sheath tube and a handle connected in sequence; the first sheath tube has the first bendable section, and a steering wire and a traction wire are accommodated and fixed in the first bendable section; one end of the steering wire is connected to the sheath tube bending control mechanism of the handle, and the sheath tube bending mechanism is adapted to realize the bidirectional bending of the first bendable section of the first sheath tube and lock to maintain the bending angle by pulling the steering wire bidirectionally; one end of the traction wire is connected to the forceps head opening and closing control mechanism of the handle, and the other end is connected to the forceps head, and the forceps head opening and closing control mechanism is adapted to realize the opening and closing of the forceps head and lock to maintain the open and closed state by pulling the traction wire bidirectionally; the first bendable section of the first sheath tube is a multi-layer composite structure, which is sequentially composed of an outer tube, an outer snake bone, a steering wire, a snake bone connecting tube and an inner snake bone from outside to inside; the traction wire is accommodated and passes through the inner snake bone; the outer snake bone is adapted to bend bidirectionally, and the inner snake bone is deformed and extruded by the deformation of the outer snake bone, and undergoes a bending deformation in the same direction as the outer snake bone.

2. The endoscopic surgery assisted traction system according to claim 1, characterized in that, the tip cap catheter includes a tip cap, a second sheath tube and a connector connected in sequence, and the connector is used to provide an opening for the traction forceps to enter the second sheath tube; there are at least two parallel through channels in the tip cap, including a first through channel for connecting the second sheath tube and a second through channel for installing an endoscope, so that the second sheath tube and the endoscope are arranged in parallel; the first through channel is used for passing the traction forceps, and the second bendable section is located at the distal end of the second sheath tube.

3. The endoscopic surgery assisted traction system according to claim 2, characterized in that, a step protruding inward is provided in the second through channel, and the step is used to block the lens of the endoscope.

4. The endoscopic surgery assisted traction system according to claim 3, characterized in that, there is a partition layer between a section at the starting end of the first through channel and a section at the starting end of the second through channel, forming a partition layer section, and a section at the end of the first through channel and a section at the end of the second through channel are connected through a notch, forming a notch section, and the partition layer section is adjacent to the notch section.

5. The endoscopic surgery assisted traction system according to claim 4, characterized in that, the length of the notch section is greater than the distance between the step and the distal end face of the tip cap.

6. The endoscopic surgery assisted traction system according to claim 2, characterized in that, the distal end of the first through channel on the tip cap is a bevel.

7. The endoscopic surgical assistance traction system according to claim 6, wherein, the radial height of the inclined surface is greater than the inner diameter of the first through-channel and does not exceed 1 / 2 of the height of the distal cap.

8. The endoscopic surgical assistance traction system according to claim 1, wherein, the second bendable section has a plurality of notches.

9. The endoscopic surgical assistance traction system according to claim 8, wherein, the notches penetrate the tube wall.

10. The endoscopic surgical assistance traction system according to claim 8, wherein, a soft film is provided on the inner wall of the notches.

11. The endoscopic surgical assistance traction system according to any one of claims 8 - 10, wherein, the plurality of notches extend axially and are arranged radially in the following manner: on the same radial cross-section, there are a plurality of notches arranged at intervals along the circumference; or, on the same radial cross-section, there is only one notch that does not cover the circumference; or, on the same radial cross-section, there is only one notch that covers the circumference; in the first two radial arrangement methods, the positions of the notches on adjacent radial cross-sections are the same or staggered.

12. The endoscopic surgical assistance traction system according to claim 1, wherein, the second bendable section is a single-wall corrugated pipe; the outer wall of the single-wall corrugated pipe is: a sequentially progressive annular structure; or, a single spiral structure; or, a plurality of spiral structures.

13. The endoscopic surgical assistance traction system according to claim 1, wherein, the outer snake bone is suitable for bending 270° in both directions.

14. The endoscopic surgical assistance traction system according to claim 1, wherein, the inner snake bone is suitable for bending 180° in both directions.

15. The endoscopic surgical assistance traction system according to claim 1, wherein, the proximal ends of the outer snake bone, the inner snake bone and the snake bone connecting pipe are fixedly connected axially; the inner snake bone remains in a freely movable state at the end close to the forceps head.

16. The endoscopic surgical assistance traction system according to claim 1, wherein, the steering wires are axially arranged on both sides of the first sheath tube and are suitable for bending the first sheath tube to different sides by pulling one side of the steering wires in the direction approaching the forceps head or away from the forceps head.

17. The endoscopic surgical assistance traction system according to claim 1, wherein, the sheath tube bending control mechanism includes a bending push button assembly and a roller; the bending push button assembly is slidably arranged in the middle of the lower cover of the handle, and the roller is fixedly arranged at the rear of the lower cover; the steering wires are fixed by the bending push button assembly and then extend to the roller, and are wound around the roller and then turn back.

18. The endoscopic surgical assistance traction system according to claim 17, wherein, 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 arranged on the inner bottom surface of the lower cover, a second spring is accommodated in the second push-button seat, a second block is provided on the top surface of the second spring, a second screw with its head facing upward is built in the second block, and a second push button is screwed on the second screw.

19. The endoscopic surgical assistance traction system according to claim 18, wherein, the steering wire at least includes an upper-side steering wire and a lower-side steering wire, and the upper-side steering wire and the lower-side steering wire are separated or continuous with each other.

20. The endoscopic surgical assistance traction system according to claim 19, wherein, when the upper-side steering wire and the lower-side steering wire are continuous with each other, a first steering wire scaling structure is provided on the second push-button seat, and the first steering wire scaling structure is adapted to simultaneously adjust the effective lengths of the upper-side steering wire and the lower-side steering wire.

21. The endoscopic surgical assistance traction system according to claim 20, wherein, the first steering wire scaling structure includes an adjustment channel and an adjustment rod. The adjustment channel is a cavity and extends along the length direction of the lower cover. The adjustment rod perpendicularly penetrates one side wall of the cavity from the outside to the inside in a direction perpendicular to the extension direction of the adjustment channel and is rotatably mounted on the other side wall in a bidirectional manner. A through hole is radially provided in the middle section of the adjustment rod; the adjustment channel serves as a channel for the steering wire to pass through and for scaling the effective length, and the steering wire directly winds around the adjustment rod for a certain number of turns or passes through the through hole and then winds around the adjustment rod for a certain number of turns.

22. The endoscopic surgical assistance traction system according to claim 21, wherein, the steering wire sequentially includes an upper-side steering wire, an adjustment steering wire, and a lower-side steering wire, and the three are continuous with each other; a second steering wire scaling structure is provided on the second push-button seat, and the second steering wire scaling structure is adapted to respectively and bidirectionally adjust the effective lengths of the upper-side steering wire and the lower-side steering wire by bidirectionally scaling the length of the adjustment steering wire.

23. The endoscopic surgical assistance traction system according to claim 22, wherein, the second steering wire scaling structure includes an adjustment channel, a left adjuster, and a right adjuster. The adjustment channel is a cavity and extends along the length direction of the lower cover. The left adjuster and the right adjuster respectively perpendicularly penetrate one side wall of the cavity from the outside to the inside in a direction perpendicular to the extension direction of the adjustment channel and are rotatably mounted on the other side wall in a bidirectional manner. Through holes are radially provided in the middle sections of the left adjuster and the right adjuster; the adjustment channel serves as a channel for the steering wire to pass through and for scaling the effective length, and the steering wire directly winds around the left adjuster and the right adjuster for a certain number of turns or passes through each of the through holes and then winds around the left adjuster and the right adjuster for a certain number of turns.

24. The endoscopic surgical assistance traction system according to claim 18, wherein, The handle includes an upper cover, and a plurality of card slots are provided on the inner top surface of the upper cover; at least one second protrusion is provided on the second clamping block, and the second protrusion is adapted to be embedded in the card slot to fix the position of the second push button seat.

25. The endoscopic surgical assistance traction system according to claim 24, wherein, a sliding groove is provided on the upper cover, 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.

26. The endoscopic surgical assistance traction system according to claim 24, wherein, a guiding groove is provided on the upper cover, and the guiding groove is adapted to accommodate the steering wire and guide it.

27. The endoscopic surgical assistance traction system according to claim 26, wherein, a guiding sleeve is provided in the guiding groove.

28. The endoscopic surgical assistance traction system according to claim 18, wherein, a second limiting portion extending inward is provided at the opening of the accommodating cavity of the second push button seat.

29. The endoscopic surgical assistance traction system according to claim 1, wherein, the clamp head opening and closing control mechanism includes a clamping push button assembly provided at the front part of the lower cover of the handle. The clamping push button assembly includes a first push button seat, and a traction wire fixing interface is provided on the first push button seat. The traction wire is fixed to the traction wire fixing interface; the first push button seat is slidably provided on the inner bottom surface of the lower cover, a first spring is accommodated in the first push button seat, a first clamping block is provided on the top surface of the first spring, a first screw with its head facing upward is provided inside the first clamping block, and a first push button is screwed on the first screw.

30. The endoscopic surgical assistance traction system according to claim 29, wherein, at least one first protrusion is provided on the first clamping block, and the first protrusion is adapted to be embedded in a plurality of card slots on the upper cover of the handle to fix the position of the first push button seat.

31. The endoscopic surgical assistance traction system according to claim 29, wherein, a first limiting portion extending inward is provided at the opening of the accommodating cavity of the first push button seat.

32. The endoscopic surgical assistance traction system according to claim 1, wherein, the handle includes a stress diffusion tube, and the stress diffusion tube is docked with the first sheath tube.

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