A traction tool for ESD surgery

Abstract

This invention belongs to the field of endoscopic surgical instruments, and specifically relates to a traction tool for ESD surgery. The invention includes metal clips, and the traction tool comprises a connecting ring and at least three fixing chains, one end of which is connected to the connecting ring. The other end of each fixing chain is a metal clip. Each fixing chain includes at least one first fixing chain and at least two second fixing chains. The connection points of the first and second fixing chains to the connecting ring are located relative to the connecting ring. The annular hole of the connecting ring allows at least one metal clip to pass through simultaneously. This invention allows the traction position to be changed at any time according to the lesion morphology and dissection progress without needing to remove the endoscope and start over. The elastic structure of the connecting ring allows for flexible adjustment of the traction tension, avoiding secondary damage such as traction deformation and traction failure caused by different adhesion conditions between the target mucosa and normal tissue.

Description

Technical Field

[0001] This invention belongs to the field of endoscopic surgical instruments technology, and in particular relates to a traction tool for ESD surgery. Background Technology

[0002] In clinical practice, with the development of endoscopic diagnostic and treatment technologies, more and more early gastrointestinal cancers are achieving good treatment results with endoscopy-guided submucosal dissection (ESD). However, submucosal dissection during ESD remains a complex and risky procedure, requiring experienced endoscopists. Maintaining a good surgical field and selecting an appropriate dissection direction are crucial for the success of the procedure. Although various traction methods have been tried clinically, such as gravity traction, dental floss traction, SO clip traction, magnetic traction, and figure-eight ring traction, each method has its limitations. Exploring and improving simple, convenient, and effective traction methods remains essential. For example, dental floss traction cannot be used to arbitrarily change the traction site; if a change is necessary, the endoscope must be removed, the floss re-attached, and the endoscope re-entered to re-clamp the traction position. Similarly, SO clips and figure-eight rings cannot be used to adjust the traction direction in real-time during ESD, nor can their traction positions be changed as needed. Furthermore, ESD is not a linear dissection in a single direction; the direction must be dynamically adjusted based on the lesion morphology, submucosal structure, and real-time intraoperative conditions, such as avoiding bleeding points, lesion infiltration, or local fibrosis. Prior art WO2020015692A1 discloses a traction device and a traction ring for the traction device, published on January 23, 2020. The traction device includes a clamping part and a traction part. The traction part contains a closed traction structure made of an elastic material. The clamping part includes a clamping body and a clamping arm. The clamping body can pass through the biopsy channel of an endoscope, and the clamping arm can clamp the closed traction structure. The prior art also discloses a traction ring for the traction device, which is composed of one or more closed traction structures connected together, and the traction ring is made of an elastic material. Summary of the Invention

[0003] The purpose of this invention is to allow for the selection of multiple directions to control the traction force and to change the traction position as needed. Secondly, it provides a pulley-like structure to change the direction of the traction force, thereby altering the position of the traction harness, avoiding obstruction of the endoscope, and thus providing a good surgical field of view.

[0004] A traction tool for ESD surgery includes metal clips. The traction tool includes a connecting ring and at least three fixing chains, one end of which is connected to the connecting ring. The other end of each fixing chain is a metal clip. Each fixing chain includes at least one first fixing chain and at least two second fixing chains. The connection points of the first and second fixing chains to the connecting ring are located relative to the connecting ring. The annular hole of the connecting ring allows at least one metal clip to pass through simultaneously.

[0005] A multi-directional traction target mucosa can be achieved by fixing a connecting ring in the digestive tract with at least three fixing chains. The connection points of the first and second fixing chains are distributed at relative positions on the connecting ring, forming a traction structure. The connecting ring, which connects the first and second fixing chains, is similar to a fixed pulley structure, changing the traction direction of the traction clips extending from the connecting ring. When in use, the clips of the second fixing chain clamp the dissected edge of the ESD target mucosa, while the clips of the first fixing chain clamp the normal mucosa or duct wall tissue on the opposite side. Multiple traction clips can simultaneously pass through the ring holes of the connecting ring to clamp the ESD target mucosa, traction can be applied from the opposite side of the dissected side, or the target mucosa can be selectively tractioned from the dissected side without passing through the ring holes of the connecting ring. The connecting ring adopts a combination design of rigid fixing section and elastic part. The rigid section provides a stable connection base, while the elastic part can adaptively stretch with traction tension to maintain the stability of the traction angle.

[0006] Traditional traction tools typically pull the target mucosa from the dissection side, making them unsuitable for dissecting irregular lesions during ESD surgery. The target mucosa pulled up by the traction tool can easily obstruct the endoscopic view during dissection, and it also prevents observation of normal tissue or fistulas beneath the target mucosa. This invention, through the symmetrical distribution of multiple fixing chains, allows for comprehensive traction selection. The surgeon can change the traction position at any time according to the lesion morphology and dissection progress, avoiding obstruction of the endoscopic view and eliminating the need to remove the endoscope and restart the procedure. The elastic structure of the connecting rings allows for flexible adjustment of traction tension, preventing secondary damage such as traction deformation or traction failure caused by different adhesion conditions between the target mucosa and normal tissue.

[0007] Preferably, the metal clips of the second fixation chain clamp the target mucosa of the ESD procedure, and the metal clips of the first fixation chain clamp the mucosa on the opposite side of the target mucosa of the ESD procedure.

[0008] Preferably, the metal clip of the second fixed chain is a magnetic metal clip, and the connection between the connecting ring and the second fixed chain is provided with a traction magnet that attracts the magnetic metal clip.

[0009] The metal clips of the second fixing chain employ a magnetic design. A fan-shaped traction magnet is embedded in the middle of the second fixing section of the connecting ring. The magnetic field strength of the traction magnet is 500-1000 Gauss, and the magnetic force covers the entire connection area of ​​the second fixing chain. When the metal clips of the second fixing chain clamp the target mucosa, upon approaching the connecting ring, the magnetic plate inside the metal clip and the traction magnet generate an opposite magnetic attraction, forming an additional attraction force of 1-3N. This, combined with the traction force of the practitioner, prevents the mucosa from slipping off the clamp. The outer surface of the traction magnet is sealed with a medical-grade polytetrafluoroethylene layer and wrapped around the second fixing section to avoid direct contact with the digestive tract mucosa, preventing magnet corrosion or tissue reaction.

[0010] Traditional traction tools rely solely on the operator pulling the metal clamps to pull the dissected target mucosa. When the target mucosa is deformed due to traction or has a smooth surface, the operator's control over force can easily lead to traction failure or even mucosal tearing. This invention reduces the probability of traction failure through a dual traction mechanism of magnetic adsorption and operator intervention. The fan-shaped annular magnet design ensures that all metal clamps of the second fixing chain generate effective attraction when close together, eliminating the need for precise alignment of the traction magnet and making operation more convenient. Simultaneously, the magnetic force range of the traction magnet is controlled within a safe threshold, preventing adverse effects on endoscopic equipment or human tissue. Compared to existing external magnetic traction devices, this tool significantly improves safety and practicality.

[0011] Preferably, the connecting ring includes at least two rigid fixing segments, each fixing segment having a fixing groove for connecting to the fixing chain. The fixing segment includes a first fixing segment and a second fixing segment, the first fixing segment and the second fixing segment being located at opposite positions on the connecting ring. The first fixing segment is connected to the first fixing chain, and the second fixing segment is connected to the second fixing chain.

[0012] Preferably, the connecting ring further includes an elastic portion, one end of which is connected to a first fixed segment, and the other end of which is connected to a second fixed segment. The elastic portion and the fixed segment constitute the ring body of the connecting ring.

[0013] Preferably, the fixing grooves at the second fixing section are arranged at equal angles, and the length of the first fixing section accounts for 1 / 5 to 1 / 4 of the total circumference of the connecting ring.

[0014] Preferably, the traction magnet is embedded in the middle of the second fixed section. The traction magnet is a fan-shaped ring with a central angle of 90°-120° and a thickness of 1-2mm. The magnetic force coverage of the magnet includes all the fixed groove areas on the second fixed section, ensuring that an effective attraction force can be generated when the magnetic metal clip of any second fixed chain approaches.

[0015] Preferably, the fixing grooves of the first fixing section are arranged at equal angles, the elastic portions at both ends of the first fixing section are symmetrical, the elastic coefficients of the elastic portions are the same, and the stretching amplitude of the elastic portion of the connecting ring is symmetrical when it is subjected to force.

[0016] Preferably, the elastic part is a spring structure with a wire diameter of 0.5-1mm. The length of the spring structure in its natural state is 1 / 5-1 / 4 of the total circumference of the connecting ring. The elastic part can be stretched to 1.5-2 times its original length.

[0017] Preferably, the fixed chain is a circular link, which is made of medical-grade polyetheretherketone or titanium alloy, and the allowable rotation angle between adjacent links is ≥180°.

[0018] This invention offers the following advantages: the omnidirectional traction angle can be flexibly adjusted according to the lesion morphology, allowing for switching of the traction position without removing the endoscope, while avoiding the problem of mucosa obstructing the field of vision; the magnetic anti-dislodgement system reduces the mucosal slippage rate through dual fixation of manual traction and magnetic adsorption, and the controllable magnetic force of 1-3N ensures fixation strength while avoiding the adverse effects of external strong magnetic field equipment on human tissue and endoscopic equipment; the elastic adaptive connecting ring can dynamically adjust the traction tension with the peristalsis of the digestive tract, buffering instantaneous stress impact and reducing the mucosal damage rate, and the symmetrical elastic design ensures uniform distribution of traction force, maintaining a stable surgical field of vision. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a traction tool used in ESD surgery.

[0021] Figure 2 A cross-sectional view of a traction tool used in ESD surgery.

[0022] Figure 3 This is a diagram showing the usage status of a traction tool used in ESD surgery.

[0023] Figure 4 A traction tool for ESD surgery Figure 2 and Figure 3 A magnified view of a portion of the image.

[0024] Figure 5This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0025] Figure 6 This is a front view of Embodiment 2 of the present invention.

[0026] Figure 7 This is a usage diagram of Embodiment 2 of the present invention.

[0027] Legend: 1 First fixing chain; 2 Connecting ring; 21 First fixing section; 22 Elastic part; 23 Traction magnet; 24 Second fixing section; 25 Fixing groove; 3 Second fixing chain; 4 Magnetic metal clip; 5 Traction metal clip; 6 Contralateral mucosa; 7 Target mucosa. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1 like Figure 1 and Figure 2 As shown, a traction tool for ESD surgery includes metal clips. The traction tool includes a connecting ring 2 and four fixing chains with one end connected to the connecting ring 2. The other end of the fixing chain is a metal clip. The fixing chain includes a first fixing chain 1 and three second fixing chains 3. The connection points of the first fixing chain 1 and the second fixing chains 3 with the connecting ring 2 are located at the relative positions of the connecting ring 2. The annular hole of the connecting ring 2 allows one metal clip to pass through simultaneously.

[0030] like Figure 3 As shown, a connecting ring 2 is fixed in the digestive tract by four fixed chains, enabling multi-directional selective traction of the target mucosa 7. The connection points of the first fixed chain 1 and the second fixed chain 3 are distributed at opposite positions on the connecting ring 2, forming a traction structure. The connecting ring 2, which connects the first fixed chain 1 and the second fixed chain 3, is similar to a fixed pulley structure, changing the traction direction of the traction metal clips 5 extending from the connecting ring 2. When in use, the magnetic metal clips 4 of the second fixed chain 3 clamp the dissected edge of the ESD surgical target mucosa 7, and the traction metal clips 5 of the first fixed chain 1 clamp the normal mucosa or duct wall tissue of the opposite mucosa 6. Multiple traction metal clips 5 can pass through the ring holes of the connecting ring 2 simultaneously to clamp the ESD surgical target mucosa 7, traction of the target mucosa 7 from the opposite side of the dissected side, or selective traction of the target mucosa 7 from the dissected side without passing through the ring holes of the connecting ring 2. The connecting ring 2 adopts a combination design of a rigid fixed section and an elastic part 22. The rigid section provides a stable connection base, and the elastic part 22 can adaptively stretch with the traction tension to maintain the stability of the traction angle.

[0031] Traditional traction tools typically pull the target mucosa 7 from the dissection side, which is difficult to adapt to the dissection needs of irregular lesions in ESD surgery. The target mucosa 7 pulled up by the traction tool can easily obstruct the endoscopic view during dissection, and it is also impossible to observe the normal tissue or fistula below the target mucosa 7 during the dissection process. This invention, through the symmetrical distribution of multiple fixing chains, can achieve all-round traction selection. The operator can change the traction position at any time according to the lesion morphology and dissection progress without having to remove the endoscope and start over. The elastic part 22 of the connecting ring 2 can flexibly adjust the traction tension, avoiding secondary damage such as traction deformation and traction failure caused by different adhesion conditions between the target mucosa 7 and normal tissue.

[0032] like Figure 3 As shown, the magnetic metal clip 4 of the second fixing chain 3 clamps the target mucosa 7 of the ESD surgery, and the traction metal clip 5 of the first fixing chain 1 clamps the mucosa 6 on the opposite side of the target mucosa 7 of the ESD surgery.

[0033] like Figure 4 As shown, the metal clip of the second fixed chain 3 is a magnetic metal clip 4, and a traction magnet 23 that attracts the magnetic metal clip 4 is provided at the connection between the connecting ring 2 and the second fixed chain 3.

[0034] The magnetic metal clip 4 of the second fixing chain 3 is magnetically designed. A fan-shaped traction magnet 23 is embedded in the middle of the second fixing section 24 of the connecting ring 2. The magnetic field strength of the traction magnet 23 is sufficient to cover the entire connection area of ​​the second fixing chain 3. When the magnetic metal clip 4 of the second fixing chain 3 clamps the target mucosa 7, when it approaches the connecting ring 2, the magnetic sheet inside the magnetic metal clip 4 and the traction magnet 23 generate an opposite magnetic attraction force. The additional attraction force formed, together with the traction force of the practitioner, prevents the target mucosa from slipping. The outer surface of the traction magnet 23 is sealed with a medical-grade polytetrafluoroethylene layer and wrapped with the second fixing section 24 to avoid direct contact with the digestive tract mucosa and prevent magnet corrosion or tissue reaction.

[0035] Traditional traction tools rely solely on the operator pulling the traction metal clips 5 to pull the dissected target mucosa 7. When the target mucosa 7 is deformed due to traction or has a smooth surface, the operator's force control can easily lead to traction failure or even mucosal tearing. This invention reduces the probability of traction failure through a dual traction mechanism of magnetic adsorption and operator intervention. The design of the fan-shaped traction magnet 23 ensures that all magnetic metal clips 4 of the second fixing chain 3 generate effective attraction when they are close together, eliminating the need for precise alignment of the traction magnet 23 and making operation more convenient. At the same time, the magnetic force range of the traction magnet 23 is controlled within a safe threshold, preventing adverse effects on endoscopic equipment or human tissue. Compared with existing external magnetic traction devices, this tool significantly improves safety and practicality.

[0036] like Figure 4As shown, the connecting ring 2 includes two rigid fixing sections. Each fixing section has a fixing groove 25 to connect to the fixing chain. The fixing section includes a first fixing section 21 and a second fixing section 24. The first fixing section 21 and the second fixing section 24 are located at opposite positions on the connecting ring 2. The first fixing section 21 is connected to the first fixing chain 1, and the second fixing section 24 is connected to the second fixing chain 3.

[0037] The connecting ring 2 also includes two elastic sections 22. One end of the elastic section 22 is connected to the first fixed section 21, and the other end of the elastic section 22 is connected to the second fixed section 24. The elastic section 22 and the fixed section constitute the ring body of the connecting ring 2.

[0038] The fixing grooves 25 at the second fixing section 24 are set at equal angle intervals, and the length of the first fixing section 21 accounts for 1 / 4 of the total circumference of the connecting ring 2.

[0039] The traction magnet 23 is embedded in the middle of the second fixed section 24. The traction magnet 23 is a fan-shaped ring with a central angle of 110° and a thickness of 1.4 mm. The magnetic force coverage of the magnet includes all the fixed groove 25 areas on the second fixed section 24, ensuring that an effective attraction force can be generated when any magnetic metal clip 4 of the second fixed chain 3 approaches.

[0040] The magnetic anti-slip system works based on the principle of attraction between opposite magnetic poles. A fan-shaped traction magnet with a central angle of 110° and a thickness of 1.4mm is embedded in the middle of the second fixing section of the connecting ring. Its surface magnetic field strength is 750 Gauss, and the magnetic force coverage area has a diameter of 15mm, allowing it to simultaneously act on the magnetic metal clips of the three second fixing chains. When the target mucosa clamped by the magnetic metal clip is cut with an electrocautery knife, the elastic force of the elastic part and the traction force of the surgeon pull the target mucosa up. When it approaches the connecting ring, the neodymium iron boron magnet inside the metal clip generates a 2N attraction force with the traction magnet. This, combined with the surgeon's own traction force, is far greater than the 1-2N traction force required in ESD surgery, ensuring that the mucosa does not slip during traction. Existing magnetic traction devices mostly use external magnets for control, making it difficult to precisely control the magnetic field strength, which can easily interfere with the electronic components of endoscopic equipment, and the mucosal slippage rate is still as high as 12%. This invention, through a built-in magnetic adsorption system, controls the magnetic field in a localized area, avoiding interference with endoscopic equipment. The fixing grooves 25 of the first fixing segment 21 are arranged at equal angles. The elastic portions 22 at both ends of the first fixing segment 21 are symmetrical. The elastic coefficients of the elastic portions 22 are the same. The stretching amplitude of the elastic portion 22 when the connecting ring 2 is subjected to force is symmetrical.

[0041] The elastic portion 22 is a spring structure with a wire diameter of 0.8 mm. In its natural state, the spring structure's length is 1 / 4 of the total circumference of the connecting ring 2. The elastic portion 22 can be stretched to 1.5 times its original length. After the traction metal clip 5 passes through the connecting ring and clamps the target mucosa, the operator... Figure 7 The metal clip 5 is pulled in the manner shown. The fixed pulley structure of the connecting ring can change the direction of the traction force by 90°-180°, achieving reverse traction from the opposite side of the target mucosa. The elastic part of the connecting ring uses a medical-grade nickel-titanium shape memory alloy spring. The spring with a wire diameter of 0.8mm has a length of 1 / 4 of the total circumference of the connecting ring in its natural state. When subjected to a traction force of 5-8N, it can stretch to 1.5 times its original length, generating a rebound force of 2-3N. The traction tension is adaptively adjusted by the deformation of the spring, avoiding sudden changes in traction force caused by gastrointestinal peristalsis.

[0042] The fixed chain consists of circular links made of medical-grade polyetheretherketone (PEEK) or titanium alloy. The permissible rotation angle between adjacent links is ≥180°. The elastic connecting ring and circular links of this invention can transmit instantaneous stress through spring deformation and the anisotropic forces of the circular links, controlling the traction tension fluctuation range within ±0.5N, thereby reducing the mucosal tear rate.

[0043] Example 2 like Figure 5 , Figure 6 and Figure 7 As shown, a traction tool for ESD surgery includes metal clips. The traction tool includes a connecting ring 2 and six fixing chains, one end of which is connected to the connecting ring 2. The other end of the fixing chain is a metal clip. The fixing chain includes three first fixing chains 1 and three second fixing chains 3. The connection points of the first fixing chains 1 and the second fixing chains 3 with the connecting ring 2 are located at the relative positions of the connecting ring 2. The annular hole of the connecting ring 2 allows one metal clip to pass through simultaneously.

[0044] like Figure 7As shown, a connecting ring 2 is fixed in the digestive tract by six fixed chains, enabling multi-directional selective traction of the target mucosa 7. The connection points of the first fixed chain 1 and the second fixed chain 3 are distributed at opposite positions on the connecting ring 2, forming a traction structure. The connecting ring 2, which connects the first fixed chain 1 and the second fixed chain 3, is similar to a fixed pulley structure, changing the traction direction of the traction metal clips 5 extending from the connecting ring 2. When in use, the magnetic metal clips 4 of the second fixed chain 3 clamp the dissected edge of the ESD surgical target mucosa 7, and the traction metal clips 5 of the first fixed chain 1 clamp the normal mucosa or duct wall tissue of the opposite mucosa 6. Multiple traction metal clips 5 can pass through the ring holes of the connecting ring 2 simultaneously to clamp the ESD surgical target mucosa 7, traction of the target mucosa 7 from the opposite side of the dissected side, or selective traction of the target mucosa 7 from the dissected side without passing through the ring holes of the connecting ring 2. The connecting ring 2 adopts a combination design of a rigid fixed section and an elastic part 22. The rigid section provides a stable connection base, and the elastic part 22 can adaptively stretch with the traction tension to maintain the stability of the traction angle.

[0045] While a single first fixation chain traction device can adapt to intestinal peristalsis and avoid changes in the direction of traction force due to peristalsis, it is prone to excessive local traction on the contralateral mucosa due to concentrated force, increasing the mucosal injury rate. Using three or more first fixation chains helps to distribute the traction force evenly on the target mucosa, and the clamping position of the first fixation chains can be adjusted sequentially, thus meeting the traction needs of large lesions with a diameter of 3 cm or more, and avoiding mucosal slippage during the adjustment of traction points. It is especially suitable for ESD surgery of complex lesions such as laterally developing tumors and gastric fundus varices.

[0046] The traction tool of this invention can flexibly adjust the traction angle in all directions according to the lesion morphology, and the traction position can be switched without removing the endoscope, while avoiding the problem of mucosa obstructing the field of vision; the magnetic anti-dislodgement system reduces the mucosal slippage rate through the dual fixation of manual traction and magnetic adsorption, and the controllable magnetic force ensures fixation strength while avoiding the adverse effects of external strong magnetic field equipment on human tissue and endoscopic equipment; the elastic adaptive connecting ring can dynamically adjust the traction tension with the peristalsis of the digestive tract, buffer instantaneous stress impact, reduce the mucosal damage rate, and the symmetrical elastic design ensures uniform distribution of traction force and maintains a stable surgical field of vision.

[0047] The above embodiments and / or implementation methods are merely illustrative of preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art may make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but these should still be regarded as the technology or embodiments that are substantially the same as the present invention.

Claims

1. A traction tool for ESD surgery, comprising a metal clamp, characterized in that, The traction tool includes a connecting ring (2) and at least three fixing chains, one end of which is connected to the connecting ring (2). The other end of the fixing chain is a metal clip. The fixing chain includes at least one first fixing chain (1) and at least two second fixing chains (3). The connection points of the first fixing chain (1) and the second fixing chains (3) with the connecting ring (2) are located at the relative positions of the connecting ring (2). The annular hole of the connecting ring (2) allows at least one metal clip to pass through simultaneously. The connecting ring (2) includes at least two rigid fixing segments, each fixing segment having a fixing groove (25) for connecting to the fixing chain. The fixing segment includes a first fixing segment (21) and a second fixing segment (24), the first fixing segment (21) and the second fixing segment (24) being located at opposite positions on the connecting ring (2). The first fixing segment (21) is connected to the first fixing chain (1), and the second fixing segment (24) is connected to the second fixing chain (3). The connecting ring (2) further includes an elastic part (22), one end of which is connected to a first fixed segment (21), and the other end of which is connected to a second fixed segment (24). The elastic part (22) and the fixed segment constitute the ring body of the connecting ring (2).

2. The traction tool for ESD surgery according to claim 1, characterized in that, The metal clip of the second fixing chain (3) is a magnetic metal clip (4), which clamps the target mucosa (7) of the ESD surgery. The metal clip of the first fixing chain (1) is a traction metal clip (5), which clamps the mucosa (6) on the opposite side of the target mucosa (7) of the ESD surgery.

3. A traction tool for ESD surgery according to claim 2, characterized in that, The connection point between the connecting ring (2) and the second fixed chain (3) is provided with a traction magnet (23) that attracts the magnetic metal clip (4).

4. A traction tool for ESD surgery according to claim 3, characterized in that, The fixing groove (25) at the second fixing section (24) is set at equal angle intervals, and the length of the first fixing section (21) accounts for 1 / 5-1 / 4 of the total circumference of the connecting ring (2).

5. A traction tool for ESD surgery according to claim 4, characterized in that, The traction magnet (23) is embedded in the middle of the second fixed section (24). The traction magnet (23) is a fan-shaped ring with a central angle of 90°-120° and a thickness of 1-2mm. The magnetic force coverage of the traction magnet (23) includes all the fixed groove (25) areas on the second fixed section (24), ensuring that an effective attraction force can be generated when any magnetic metal clip (4) of the second fixed chain (3) approaches.

6. A traction tool for ESD surgery according to claim 1, characterized in that, The fixing grooves (25) of the first fixing segment (21) are set at equal angles. The elastic parts (22) at both ends of the first fixing segment (21) are symmetrical. The elastic coefficients of the elastic parts (22) are the same. The stretching amplitude of the elastic part (22) when the connecting ring (2) is subjected to force is symmetrical.

7. A traction tool for ESD surgery according to claim 1, characterized in that, The elastic part (22) is a spring structure with a wire diameter of 0.5-1mm. The length of the spring structure in its natural state is 1 / 5-1 / 4 of the total circumference of the connecting ring (2). The elastic part (22) can be stretched to 1.5-2 times its original length.

8. A traction tool for ESD surgery according to claim 1, characterized in that, The fixed chain is a circular link, which is made of medical-grade polyetheretherketone or titanium alloy, and the allowable rotation angle between adjacent links is ≥180°.

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