An electrical loop electrosurgical device

Abstract

The embodiment of the present specification provides a loop snare cutting knife. Including a sheath tube, a wire loop, a cutting knife part and an insulation structure, the distal end of the wire loop is connected to the cutting knife part, the wire loop and the cutting knife part are provided with the insulation structure, and the wire loop can be operatively received in the sheath tube or extended out of the sheath tube. The insulation structure is provided to enable the wire loop to be insulated from the cutting knife part when performing the cutting function.

Description

Technical Field

[0001] This manual relates to the field of medical device technology, and in particular to an electric loop cutter. Background Technology

[0002] Currently, endoscopic submucosal dissection (ESD) is a minimally invasive technique used for the complete resection of precancerous lesions or early-stage gastrointestinal cancers with limited risk of lymph node metastasis. Compared to endoscopic submucosal resection (EMR), ESD achieves a higher overall resection rate but increases the risk of perforation and bleeding. Furthermore, due to its technical complexity, ESD requires a longer learning curve. A standard ESD procedure mainly includes the following steps: lesion marking, submucosal injection, mucosal incision, submucosal dissection, and hemostasis using electrosurgical devices or instruments such as needle knives and hemostatic forceps.

[0003] Hybrid ESD (H-ESD) aims to simplify the overall resection of specific lesions. In short, after mucosal incision and partial submucosal dissection, the lesion is removed using a snare. H-ESD has proven to be a safe and effective method for resecting colorectal lesions, with shorter operation time, fewer complications, and no difference in recurrence rate compared to conventional ESD (C-ESD). To improve the efficiency and reduce the cost of H-ESD, new instruments integrating multiple functions such as marking, incision, and dissection have been developed.

[0004] Surgical instruments with snare tips grafted onto cutting blades have emerged to enable multiple functions with a single instrument. For example, Chinese prior art patent CN119908829B discloses an endoscopic snare cutting blade. The distal end of the snare can be inserted into the proximal end of the cutting blade, establishing a fixed connection. When the snare is retracted into the sheath, the cutting blade grafted onto the tip can extend from the distal end of the sheath to perform mucosal incision. After the snare, carrying the cutting blade, extends from the distal end of the sheath, it can be used to remove polyps or tumors. However, because the snare and cutting blade are directly fixedly connected, continuous electrical conductivity between the cutting blade and the snare occurs when using the snare function for polyp removal. This causes continuous discharge from the cutting blade, easily burning surrounding normal tissue and mucosa, causing unnecessary damage to the body, and increasing the risk of postoperative bleeding. In severe cases, it can lead to perforation and other consequences, affecting the surgical outcome.

[0005] Therefore, there is a need to provide an improved electric loop cutter. Summary of the Invention

[0006] To address the aforementioned problems, this specification provides an electric snare cutter with the following features: it includes a sheath, a coiled wire, a cutting blade, and an insulating structure. The distal end of the coiled wire is connected to the cutting blade, and the insulating structure is provided between the coiled wire and the cutting blade. The coiled wire can be operably retracted into the sheath or extended out of the sheath. The sheath is provided with a conductive part. When the coiled wire is retracted into the sheath, it conducts electricity with the cutting blade through the conductive part, enabling the cutting blade to perform marking, water injection, or cutting normally. When the coiled wire extends out of the sheath, the cutting blade and the coiled wire are insulated from each other by the insulating structure, preventing the cutting blade from discharging when the coiled wire performs its snare function, thus avoiding burns to surrounding normal tissue and mucous membranes and improving safety and reliability. Wherein, the insulating structure is an insulating tube, which is fixedly sleeved on the distal end of the coiled wire, and the cutter is connected to the insulating tube; or, the insulating structure is an insulating coating, which covers the distal end of the coiled wire, and the cutter is sleeved on the coiled wire at the position covered by the insulating coating; and / or, the proximal end of the cutter is covered with the insulating coating at the position corresponding to the coiled wire.

[0007] Furthermore, the electric coil cutter proposed in this specification may also have the following features: when the insulating structure is an insulating tube, the cutter is sleeved outside the insulating tube; when the coiled wire is retracted into the sheath, the cutter is at least partially located between the insulating tube and the sheath in the radial cross-section of the sheath.

[0008] Furthermore, the electric coil cutter proposed in this specification may also have the following features: it further includes a connector mounted on the insulating tube; when the insulating structure is an insulating tube, the proximal end of the cutter is inserted into the insulating tube, and the connector connects to the proximal end of the cutter; when the coil is retracted into the sheath, the conductive part is electrically connected to the cutter through the connector.

[0009] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the connecting member includes a connecting block and a connecting ring, the connecting block and the connecting ring cooperating to form a circular outer surface, the connecting block being inserted from one side of the insulating tube and connected to the proximal end of the cutter; the connecting ring being inserted from the other side of the insulating tube and fitting against the insulating tube, the mating end face of the connecting block and the connecting ring engaging and fixing, thereby fixing the cutter to the insulating tube.

[0010] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the conductive part is a conductive element fixedly disposed inside the sheath; along the axial direction, the distal end of the sheath is closer to the cutter part than the distal end of the conductive element; when the coil is retracted into the sheath, the sheath covers at least a portion of the periphery of the cutter, the distal end of the conductive element abuts against the cutter, and the inner wall or proximal end of the conductive element contacts the coil.

[0011] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the conductive part is a limiting member disposed within the sheath tube, the limiting member comprising at least two limiting parts distributed along the axial direction and at least one elastic part, at least one of the elastic parts being located between at least two of the limiting parts; when the coil is retracted into the sheath tube, the distal end of the limiting part located at the farthest end abuts against the proximal end of the cutter.

[0012] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the at least two limiting portions include a first limiting portion and a second limiting portion, the elastic portion is located between the first limiting portion and the second limiting portion, wherein the first limiting portion and the second limiting portion are metal rings, the elastic portion is a metal spring, and when the coil is retracted into the sheath, the distal end of the first limiting portion abuts against the proximal end of the cutter, and the inner wall or proximal end of the second limiting portion contacts the coil.

[0013] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the conductive part is a metal elastic tube, and when the coil is retracted into the sheath, the cutter contacts the metal elastic tube and conducts electricity; the metal elastic tube includes a spring hose, the spring hose includes a first tube section and a second tube section, the proximal end of the first tube section is connected to the distal end of the second tube section, the first tube section covers at least a portion of the periphery of the cutter, the axial cross-sectional area of ​​the first tube section is larger than the axial cross-sectional area of ​​the second tube section, the inner wall of the spring hose forms a stepped surface at the connection position of the first tube section and the second tube section, and when the coil is retracted into the spring hose, the stepped surface abuts against the proximal end of the cutter.

[0014] Furthermore, the electric coil cutter proposed in this specification may also have the following features: the cutter includes a first part and a second part, the proximal end of the first part is connected to the distal end of the second part, the first part extends axially, the second part is disposed outside the insulating structure, the radial cross-sectional area of ​​the first part is smaller than the radial cross-sectional area of ​​the second part, and the distal end face of the second part is coated with an insulating layer.

[0015] Furthermore, the electric coil cutter proposed in this specification may also have the following features: it further includes a handle, a sheath, and a water injection section; the sheath includes a traction rope, and the handle is connected to the coil wire through the traction rope; the cutter has a water injection channel, and the water injection section includes a water injection connector for connecting to an external water source, the water injection connector being connected to the water injection channel through an internal channel of the sheath.

[0016] This specification also provides a method for operating an electric coil cutter, the electric coil cutter comprising a sheath, coil wire, cutting blade, and an insulating structure, wherein the insulating structure is provided between the coil wire and the cutting blade, and the coil wire is operably retracted into the sheath or extended out of the sheath; the operating method includes: energizing the coil wire; controlling the coil wire to extend out of the sheath; when the coil wire extends out of the sheath, the coil wire and the cutting blade are insulated from each other by the insulating structure; and controlling the coil wire to perform electric cut-off.

[0017] In some embodiments, the electric coil cutting knife further includes a conductive element, and the operation method further includes: controlling the coil wire to retract into the sheath; when the coil wire is retracted into the sheath, the coil wire and the cutting blade are electrically connected through the conductive element; and controlling the cutting blade to perform electric cutting.

[0018] In some embodiments, the electric coil cutting blade further includes a water injection section, the cutting blade having a water injection channel, the water injection section including a water injection connector connected to an external water source, the water injection connector communicating with the water injection channel; the operation method further includes: controlling the coil wire to retract into the sheath tube; injecting water into the water injection channel through the water injection connector.

[0019] The advantages of this invention compared to the prior art are:

[0020] In the electric loop cutter proposed in this invention, an insulating structure is provided between the loop wire and the cutting blade, and a conductive part is provided inside the sheath. When the loop wire is retracted into the sheath, the loop wire and the cutting blade can conduct electricity through the conductive part, so that the cutter can perform marking, water injection, or cutting normally. When the loop wire extends out of the sheath, the cutting blade is insulated from the loop wire due to the insulating structure, so that the cutting blade will not discharge when performing the loop function, avoiding burns to tissues and mucous membranes, and improving safety and stability. Attached Figure Description

[0021] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0022] Figure 1This is a schematic diagram of the structure of the electric coil cutter according to some embodiments of this specification;

[0023] Figure 2 This is based on some embodiments shown in this specification. Figure 1 Partial structural diagram;

[0024] Figure 3 This is a schematic diagram of the connection structure between the coiled wire and the cutter according to some embodiments of this specification;

[0025] Figure 4 This is based on some embodiments shown in this specification. Figure 3 Sectional view of AA;

[0026] Figure 5 This is a schematic diagram of the structure of the electric coil cutter according to other embodiments of this specification;

[0027] Figure 6 This is an exploded schematic diagram of an electric coil cutter according to other embodiments of this specification;

[0028] Figure 7 This is a schematic diagram of the structure of the electric coil cutter according to some embodiments of this specification;

[0029] Figure 8 This is a schematic diagram of the structure of the electric coil cutter shown in some embodiments of this specification;

[0030] Figure 9 This is a structural schematic diagram of the electric coil cutter in the extended state according to some embodiments of this specification;

[0031] Figure 10 This is a structural schematic diagram of the cutter of the electric coil cutter in the retracted state, according to some embodiments of this specification;

[0032] Figure 11 This is a structural schematic diagram of the electric coil cutter shown in some embodiments accompanying this specification;

[0033] Figure 12 This is a schematic diagram of the outer sheath tube according to some embodiments of this specification;

[0034] Figure 13 This is a schematic diagram of the blade head structure according to some embodiments of this specification;

[0035] Figure 14 This is a schematic diagram of the blade head structure according to other embodiments of this specification;

[0036] Figure 15 This is a schematic diagram of the blade head structure according to some embodiments of this specification;

[0037] Figure 16 This is according to some embodiments shown in this specification. Figure 15 BB section view;

[0038] Figure 17 This is a schematic diagram of the water injection channel and water passage shown in some embodiments of this specification;

[0039] Figure 18 This is a schematic diagram of the overall structure of the electric coil cutter according to some embodiments of this specification;

[0040] Figure 19 This is a cross-sectional schematic diagram of the overall structure of the electric coil cutter according to some embodiments of this specification.

[0041] Reference numerals: Handle 1, Handle 101, Sliding ring 102, Electrode 103, Push-pull rod 104, Lock 105, Water injection part 2, Water injection connector 201, Water inlet 2011, Roller 202, Sealing ring fixing part 203, Sealing ring 204, Sheath part 3, Heat shrink tubing 301, Sheath 302, Traction rope 303, Outer sheath 304, Sleeve part 4, Connecting tube 401, Loop wire 402, Insulating coating A 4021, Conductive component 403, Insulating tube 404, Through hole 4041, Opening 4042, Cutting component 405, First part 40501, Second part 40502, Insulating layer 4051, Insulating coating B 4052, Proximal insulating coating 40521 40522, 40523, 4053, 4054, 4055, 4055, 40551, 40552, 4056, 4057, 4058, 4059, 406, 407, 408, 409, 410, 411, 4111, 4112, 412, 412, 412, 4121, 4122, 4123, 413, 413, 4131, 4132, 4133. Detailed Implementation

[0042] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0043] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0044] It should be noted that the terms "distal" and "proximal" in the following text are used to describe the relative positions of medical device components. "Proximal" refers to the end of the component that is closer to the device operator or farther from the patient, while "distal" refers to the end of the component that is farther from the device operator or closer to the patient.

[0045] Figure 1 This is a schematic diagram of the structure of the electric coil cutter according to some embodiments of this specification.

[0046] This specification provides an electric coil cutter, particularly a disposable electric coil cutter, in some embodiments. In some embodiments, such as... Figure 1 As shown, the electric coil cutter includes a sheath 302, a coil wire 402, a cutter 405, and an insulating structure. The distal end of the coil wire 402 is connected to the cutter 405. An insulating structure is provided between the coil wire 402 and the cutter 405. The coil wire 402 can be operably retracted into the sheath 302 or extended out of the sheath 302.

[0047] The sheath 302 provides a receiving space and protection for components of the electrosurgical loop cutter (such as the coil 402). The sheath 302 may be tubular and made of a material that balances biocompatibility, mechanical strength, flexibility, and corrosion resistance. Examples of materials may include at least one of polytetrafluoroethylene, polyamide, polyethylene, and polyurethane. The coil 402 is used to perform loop resection of the lesion. The cutter 405 can be used to perform lesion marking, water injection, and lesion cutting.

[0048] In some embodiments, healthcare workers slide ring 102 (see...) Figure 19 This device can move the coil 402 towards the distal or proximal end, allowing it to extend outside or retract into the sheath 302. When the coil 402 extends outside the sheath 302, the portion outside the sheath 302 can be a ring-shaped or near-ring-shaped working end. Medical personnel can achieve rapid mucosal dissection by placing the working end on the lesion site and then moving the coil 402 proximally to retract it.

[0049] In some embodiments, the coil 402 and the electrode 103 (see...) Figure 19An electrical connection is established, thereby transferring the current input to electrode 103 to coil 402, achieving electrical cutoff of coil 402. Coil 402 can be made of conductive metal, conductive polymer material, etc.

[0050] In some embodiments of this specification, by insulating the cutter 405 and the coil wire 402, the cutter 405 is insulated during the lesion loop resection, thereby preventing the coil wire 402 from extending out of the sheath to perform the resection function. This prevents the cutter 405 from damaging the surrounding tissue due to continuous discharge, thus achieving effective protection of the surrounding normal tissue mucosa.

[0051] In some embodiments, the cutter 405 can be electrically connected to the electrode 103 when the coiled wire 402 is inside the sheath 302, thereby transmitting the current input from the electrode 103 to the cutter 405 to achieve electrical cutting by the cutter 405. The cutter 405 can be made of conductive metal, conductive polymer material, etc. Specifically, the sheath 302 or the sheath 302 itself is provided with a conductive part. When the coiled wire 402 is retracted into the sheath 302, at least part of the distal end of the cutter 405 extends out of the sheath 302. The coiled wire 402 is electrically connected to the cutter 405 through the conductive part, thereby enabling the cutter 405 to perform marking and cutting functions normally.

[0052] For more information on the 405 cutting blade, please see the following text. Figure 13-15 Related descriptions.

[0053] The insulation structure is used to achieve electrical isolation between the coil 402 and the cutter 405. The insulation structure can be of any feasible structure and material.

[0054] In some embodiments, the insulation strength of the insulation structure is greater than 15 kV / mm, and the heat resistance temperature of the insulation structure is greater than 400°C. In some embodiments, the insulation strength of the insulation structure is greater than 18 kV / mm, and the heat resistance temperature of the insulation structure is greater than 500°C. In some embodiments, the insulation strength of the insulation structure is greater than 20 kV / mm, and the heat resistance temperature of the insulation structure is greater than 600°C. In some embodiments, the insulation strength of the insulation structure is greater than 22 kV / mm, and the heat resistance temperature of the insulation structure is greater than 700°C. In some embodiments, the insulation strength of the insulation structure is greater than 25 kV / mm, and the heat resistance temperature of the insulation structure is greater than 800°C.

[0055] The insulation structure that meets the above conditions can withstand a peak voltage of 1500V without breakdown, achieving insulation between the coil wire 402 and the cutter 405. At the same time, the heat resistance of the insulation material ensures that it is not affected by the heat generated by the coil wire 402 during operation.

[0056] In some embodiments, when the coil wire 402 is retracted into the sheath 302, the coil wire 402 is conductive to the cutter 405 through the conductive part. At this time, the blade part of the cutter 405 located outside the sheath 302 can perform electro-cutting or marking on the lesion. When the coil wire 402 extends out of the sheath 302, the coil wire 402 and the cutter 405 are insulated from each other by an insulating structure. At this time, the coil wire 402 located outside the sheath 302 performs loop excision on the lesion, and since the cutter 405 is insulated from the coil wire 402, the cutter 405 will not be charged, and it is not easy to damage the surrounding normal tissue and mucosa, thus avoiding unnecessary damage to the human body.

[0057] Figure 2 This is based on some embodiments shown in this specification. Figure 1 A partial structural diagram.

[0058] In some embodiments, such as Figure 1 and Figure 2 As shown, the insulation structure is an insulating tube 404, which is fixedly sleeved on the far end of the coiled wire 402, and the cutter 405 is connected to the insulating tube 404.

[0059] In some embodiments, the insulating tube 404 is a ceramic tube or an insulating metal tube. An insulating metal tube may refer to a metal tube with an insulating coating on its surface.

[0060] In some embodiments, the insulating tube 404 may be a hollow cylinder or a prism, or a cylinder or prism with a closed distal end. The insulating tube may also be other feasible shapes, as long as it can be disposed between the coil wire 402 and the cutter 405 to achieve insulation between the two.

[0061] The insulation structure, made of ceramic or metal with an insulating coating, meets the insulation and temperature resistance requirements. In some embodiments, the wall thickness of the insulating tube can be greater than 0.1 mm. In some embodiments, the wall thickness of the insulating tube can be greater than 0.12 mm. In some embodiments, the wall thickness of the insulating tube can be greater than 0.15 mm. In some embodiments, the wall thickness of the insulating tube can be greater than 0.17 mm. In some embodiments, the wall thickness of the insulating tube can be greater than 0.19 mm. In some embodiments, the wall thickness of the insulating tube can be greater than 0.2 mm.

[0062] In some embodiments, the connection methods between the coiled wire 402 and the insulating tube 404 include, but are not limited to, interference fit, adhesive bonding, and pin fixing. The connection methods between the insulating tube 404 and the cutting blade 405 include, but are not limited to, interference fit, adhesive bonding, and pin fixing. Adhesive bonding uses fewer parts and is simpler to connect. Pin fixing provides greater stability and reliability.

[0063] In some embodiments, such as Figure 1As shown, the cutter 405 is sleeved outside the insulating tube 404. When the coiled wire 402 is retracted into the sheath tube 302, the cutter 405 is at least partially located between the insulating tube 404 and the sheath tube 302 in the radial cross-section of the sheath tube 302. The coiled wire 402, the insulating tube 404, and the cutter 405 can form a nested structure with high structural strength.

[0064] In some embodiments, the electric coil cutter further includes a fixing member, through which the insulating tube 404 is connected to the cutter 405 and the coil wire 402 respectively. Example fixing members may include pins, screws, clamps, etc.

[0065] Figure 3 This is a structural schematic diagram of the fastener shown in some embodiments of this specification. Figure 4 This is based on some embodiments shown in this specification. Figure 3 Sectional view of AA.

[0066] In some embodiments, such as Figure 3 and Figure 4 As shown, the fixing component includes a first pin 406 and a second pin 407. The cutter 405 has a first through hole 408, and the insulating tube 404 has a second through hole. The first pin 406 passes through the first through hole 408 and the second through hole to fix the cutter 405 and the insulating tube 404. The insulating tube 404 has a third through hole 409, and the second pin 407 passes through the third through hole 409 and the coiled wire 402 to fix the insulating tube 404 and the coiled wire 402.

[0067] In some embodiments, the coiled wire 402 may be folded within the insulating tube 404, with gaps between the coiled wires 402. The second pin 407 can pass through the third through hole 409 and also through the gaps between the coiled wires 402. The insulating tube 404 and the cutter 405 are fixed by the first pin 406, and the insulating tube 404 and the coiled wire 402 are fixed by the second pin 407, ensuring a stable and reliable connection and effectively preventing the connection from falling off.

[0068] Figure 5 This is a cross-sectional schematic diagram of the mounting structure between the cutting blade 405, the insulating tube 404, and the coil wire 402 in an electric coil cutter according to other embodiments of this specification. Figure 6 This is an exploded view of the installation structure between the cutter 405, insulating tube 404, and coil wire 402 of the electric coil cutter, according to some other embodiments of this specification.

[0069] In some embodiments, the electric coil cutter further includes a connector 411. The proximal end of the cutter 405 is inserted into the insulating tube 404 and mounted via the connector 411, which connects to the proximal end of the cutter 405. When the coil 402 is retracted into the sheath 302, the coil 402 and the cutter 405 are electrically connected through the conductive part and the connector 411. That is, the connector 411 is used to connect the cutter 405 and the insulating tube 404, and simultaneously cooperates with the conductive part to achieve electrical conductivity between the coil 402 and the cutter 405.

[0070] In some embodiments, such as Figure 5 and Figure 6 As shown, the connector 411 includes a separate connecting block 4111 and a connecting ring 4112. The connecting block 4111 and the connecting ring 4112 cooperate to form a circular outer surface. The insulating tube 404 is cylindrical. The distal end is provided with a through hole 4041 for the proximal end of the cutter 405 to be inserted. The part of the proximal end of the cutter 405 that is inserted into the through hole 4041 is provided with a socket 4058 in the radial direction. The insulating tube 404 has an irregularly shaped opening 4042 on the circumferential surface near the distal end. One side of the opening 4042 is connected to the through hole 4041. The connecting block 4111 is inserted from one side of the opening 4042 of the insulating tube 404. Its inner end extends through the opening 4042 into the through hole 4041 and is inserted into the insertion port 4058 of the cutter 405 to connect with the proximal end of the cutter 405. The connecting ring 4112 is inserted from the other side of the opening 4042 of the insulating tube 404 and fits against the insulating tube 404. The mating end faces of the connecting block 4111 and the connecting ring 4112 engage and fix, thereby fixing the cutter 405 to the insulating tube 404. The fixing methods of the connecting block 4111 and the connecting ring 4112 include, but are not limited to, snap-fit ​​connection, welding, screwing, and bonding. The coiled wire 402 can be fixedly connected to the insulating tube 404 via the third pin 410. The connection method is the same as the installation structure of the second pin 407 in the aforementioned embodiment, and will not be described again.

[0071] In some embodiments described in this specification, the cutter and the insulating tube are connected via connectors or fasteners as described above. This connection method is simple and robust, facilitating automated production and ensuring a secure connection between the cutter, the insulating tube, and the coiled wire. This guarantees that the cutter can be insulated through the insulating tube even when the coiled wire extends beyond the sheath. Furthermore, because the distal end of the insulating tube is insulated, it effectively prevents the energy from being dispersed by the contact tissue at the distal end of the cutter during the cutting function. This concentrates the discharge energy at the distal end of the cutter, eliminating the need for an additional insulating layer, improving production efficiency, and reducing production costs.

[0072] In some other embodiments, the insulating structure is an insulating coating. An insulating coating is a functional material layer applied to the surface of a conductor that utilizes its electrical insulating properties to prevent current from flowing along unintended paths.

[0073] In some specific embodiments, the thickness of the insulating coating can be in the range of 0.005 mm to 0.05 mm. In some embodiments, the thickness of the insulating coating can be in the range of 0.01 mm to 0.05 mm. In some embodiments, the thickness of the insulating coating can be in the range of 0.005 mm to 0.03 mm. In some embodiments, the thickness of the insulating coating can be in the range of 0.01 mm to 0.03 mm. In some embodiments, the thickness of the insulating coating can be in the range of 0.02 mm to 0.03 mm. The thickness of the insulating coating can be determined as needed based on the dielectric strength of the coating of different materials selected.

[0074] Figure 7 This is a schematic diagram of the structure of the electric coil cutter according to some embodiments of this specification.

[0075] In some embodiments, such as Figure 7 As shown, the insulation structure consists of an insulating coating A4021 covering the distal end of the coil 402, and the cutter 405 is sleeved on the coil 402 at the position where the insulating coating A4021 is covered. The distal end of the coil 402 being covered with the insulating coating A4021 means that the surface of the distal end of the folded coil 402 is coated with the insulating coating A4021, and the coating range can be set as needed. For example, the coating range of the insulating coating A4021 can extend from the distal end of the coil 402 to a position close to the contact point between the coil 402 and the sheath 302 or the conductive part (e.g., ...). Figure 7 The coiled wire 402 is shown housed inside the sheath tube 302, near the position where it contacts the conductive part. By sleeved on the coiled wire 402 around the position covered by the insulating coating A4021, insulation is achieved between the coiled wire 402 and the cutting member 405. By providing the insulating coating, no additional insulating tube is needed, which improves production efficiency and reduces production costs.

[0076] Figure 8 This is a schematic diagram of the structure of the electric ring cutter shown in some embodiments of this specification.

[0077] In some embodiments, such as Figure 8As shown, the insulation structure consists of an insulating coating B4052 covering the proximal end of the cutter 405 at the position corresponding to the coiled wire 402. In some specific embodiments, a stepped structure is provided at the circumferential edge of the proximal end of the cutter 405. The stepped structure includes a first stepped surface 4053 facing the proximal end, which is not covered with the insulating coating B4052. When the coiled wire 402 is retracted into the sheath 302, the cutter 405 conducts electricity with the conductive part and the coiled wire 402 through the first stepped surface 4053. By providing the first stepped surface 4053 on the cutter 405 to conduct electricity with the conductive part and the coiled wire 402, the insulation effect between the coiled wire 402 and the cutter 405 is ensured when the coiled wire 402 extends out of the sheath 302, while achieving conductivity between the coiled wire 402 and the cutter 405 when the coiled wire 402 is retracted into the sheath 302.

[0078] In some embodiments, such as Figure 8 As shown, a water injection channel 4056 is formed inside the cutter 405, and the water injection channel 4056 is arranged opposite to the coil wire 402. The positions of the proximal end of the cutter 405 corresponding to the coil wire 402 include the proximal end of the cutter 405, the contact position between the cutter 405 and the coil wire 402, and the inner wall of the water injection channel of the cutter 405. The insulating coating B4052 includes a proximal insulating coating 40521 covering the inner and outer sides of the proximal end of the cutter 405, a middle insulating coating 40522 covering the contact position between the cutter 405 and the coil wire 402, and a distal insulating coating 40523 covering the inner wall of the water injection channel of the cutter 405. By providing the insulating coating B4052 to cover the proximal end of the cutter 405 and the positions of the cutter 405 corresponding to the coil wire 402, creepage between the coil wire 402 and the cutter 405 can be effectively prevented. Furthermore, an insulating coating B4052 is applied to the contact position between the cutter 405 and the coiled wire 402, as well as to the inner wall of the water injection channel of the cutter 405, thereby making the proximal end of the cutter 405 an insulating part, which can further improve the insulation effect.

[0079] In some embodiments, such as Figure 8 As shown, the near end of the cutter 405 forms a chamfer 4059, and the near end insulating coating 40521 covers the entire surface of the chamfer 4059. The coating also extends a certain distance towards the near end from the outer surface of the chamfer 4059 to prevent the coil 402 from contacting the chamfer 4059 during the opening process, thus ensuring absolute insulation between the coil 402 and the cutter 405.

[0080] In some embodiments, the two implementations of the above-mentioned insulating coating (insulating coating A4021 and insulating coating B4052) can be provided simultaneously to improve the insulation effect.

[0081] In the above embodiments, the conductive part can be configured with any feasible structure as needed, as long as it can achieve the conductive effect between the coiled wire 402 retracted into the sheath tube 302 and the cutting member 405. The conductive part can be made of a conductive metal or a conductive polymer material with a certain strength. By setting the conductive part to make the cutting member and the coiled wire conductive, the cutting member located outside the sheath tube can perform electrical marking or cutting after the coiled wire is retracted into the sheath tube.

[0082] In some embodiments, the conductive part is a conductive element 403 fixedly disposed within the sheath 302; along the axial direction X, the distal end of the sheath 302 is closer to the cutter portion than the distal end of the conductive element 403; when the coiled wire 402 is retracted into the sheath 302, the sheath 302 covers at least a portion of the periphery of the cutter 405, thereby preventing the peripheral contact tissue of the cutter 405 from dispersing the energy of the cutter 405, the distal end of the conductive element 403 abuts against the cutter 405, and the inner wall or proximal end of the conductive element 403 contacts the coiled wire 402, thereby making a conductive connection between the coiled wire 402 and the cutter 405.

[0083] In some embodiments, such as Figure 1 and Figure 7 As shown, when the coiled wire 402 is retracted into the sheath 302, the coiled wire 402 contacts the conductive element 403 to conduct electricity, and the proximal end of the cutter 405 abuts against the distal end of the conductive element 403 to conduct electricity. At the same time, the conductive element 403 can provide axial support for the cutter 405 and fix the extension length of the cutter 405 to prevent the cutter 405 from extending too short and failing to enter the submucosa or from extending too long and causing mucosal perforation, thereby maintaining the stability of the cutter 405 during use.

[0084] In some embodiments, such as Figure 5 As shown, when the coil wire 402 is retracted into the sheath tube 302, the coil wire 402 contacts the conductive element 403 to conduct electricity. The distal end of the conductive element 403 abuts against the connector 411 (a combination of connecting block 4111 and connecting ring 4112) to conduct electricity. At the same time, the connecting block 4111 and connecting ring 4112 can provide axial support for the cutter 405 and fix the extension length of the cutter 405. This prevents the cutter 405 from extending too short to enter the submucosa or from extending too long to cause mucosal perforation, thereby maintaining the stability of the cutter 405 during use.

[0085] In some embodiments, such as Figure 8As shown, when the coiled wire 402 is retracted into the sheath tube 302, the coiled wire 402 contacts the conductive element 403 to conduct electricity. The distal end of the conductive element 403 abuts against the first stepped surface 4053 on the cutter 405 to conduct electricity. At the same time, the first stepped surface 4053 can provide axial support for the cutter 405 and fix the extension length of the cutter 405. This prevents the cutter 405 from extending too short to enter the submucosa or from extending too long to cause mucosal perforation, thereby maintaining the stability of the cutter 405 during use.

[0086] In some embodiments, such as Figure 1 and Figure 7 As shown, the proximal end of the cutter 405 can be configured as a bevel or an arc surface, and the distal end of the conductive element 403 can be configured as a structure matching the bevel or arc surface. In some embodiments, the angle between the bevel and the axial direction X is 45-75°. In some embodiments, the angle between the bevel and the axial direction X is 50-75°. In some embodiments, the angle between the bevel and the axial direction X is 45-70°. In some embodiments, the angle between the bevel and the axial direction X is 55-65°. In some embodiments, the angle between the bevel and the axial direction X is 60°. By providing matching bevels or arc surfaces, a guiding function can be achieved, and the cutter 405 and the conductive element 403 can fit together well.

[0087] In some embodiments, the cutter 405 and the conductive element 403 are tightly fitted together by matching bevels or arcs, which can achieve a good sealing effect and thus prevent leakage when the water injection part 2 is used for injection.

[0088] In some embodiments, the conductive element 403 includes a metal ring fixedly disposed on the inner wall of the sheath 302. When the coil wire 402 is retracted into the sheath 302, the coil wire 402 contacts the inner wall of the metal ring to conduct electricity. In some embodiments, the metal ring can be a complete circular ring or an incomplete semi-circular ring, wherein the central angle corresponding to the semi-circular ring is greater than 180°, thereby ensuring that it can contact the coil wire 402 to conduct electricity.

[0089] In some embodiments, the conductive element 403 is rotatably disposed within the sheath 302. When the metal ring is a semi-circular ring, the proximal end of the cutter 405 can be provided with a slot that can accommodate the semi-circular ring. When the metal ring abuts against the non-slotted position of the proximal end of the cutter 405, the cutter 405 abuts against the conductive element 403 and extends out of the sheath 302. By controlling the rotation of the conductive element 403, when the metal ring corresponds to the slotted position of the proximal end of the cutter 405, the cutter 405 can be retracted into the sheath 302, thereby protecting the unused cutter 405.

[0090] In some embodiments, the conductive element 403 is rotatably disposed within the sheath 302, and at least one protrusion extending distally may be provided at the distal end of the conductive element 403, and a corresponding groove capable of accommodating the protrusion may be provided at the proximal end of the cutter element 405. The functions of the protrusion and the groove are similar to those of the semicircular ring and the slot, as described above.

[0091] Figure 9 This is a schematic diagram of the structure of the electric ring cutter according to some embodiments of this specification. Figure 10 This is a schematic diagram of the structure of the electric ring cutter according to some embodiments of this specification.

[0092] In some embodiments, such as Figure 9 and Figure 10 As shown, the conductive part is a limiting member 412 disposed within the sheath 302. The limiting member 412 includes at least two limiting portions distributed along the axial direction and at least one elastic portion. The at least one elastic portion is located between the at least two limiting portions. When the coiled wire 402 is retracted into the sheath 302, the distal end of the limiting portion located at the farthest end abuts against the proximal end of the cutter member 405. By providing an elastic limiting member, the position of the cutter member can be adjusted, realizing the protection of the cutter member using the sheath. The structure is simple and has good assemblability.

[0093] For example, see Figure 9 and Figure 10 Along the axial direction X, the limiting member 412 includes a first limiting portion 4121, a second limiting portion 4123, and an elastic portion 4122. The elastic portion 4122 is located between the first limiting portion 4121 and the second limiting portion 4123. The first limiting portion 4121 and the second limiting portion 4123 can be metal rings, and the elastic portion 4122 can be a metal spring. For example, the elastic portion 4122 provides elastic force (e.g., an initial elastic force of 5-8 N) to provide effective support force to the cutting member 405 for cutting the mucosa. When using the cutting member 405 to perform mucosal incision, medical personnel can slide the ring 102 to move it proximally with a certain pulling force, causing the cutting member 405 to contact the first limiting portion 4121 for limiting. See [link to relevant documentation]. Figure 9 When the cutter 405 needs to be retracted into the sheath 302 for protection, medical personnel can apply a force (e.g., a force greater than the initial elastic force of 8N) to the sliding ring 102 to overcome the elastic force of the elastic part 4122, causing the cutter 405 to retract into the sheath 302. Rotating the locking buckle 105 locks the sliding ring 102 against the handle 101, thus retaining the cutter 405 within the sheath 302. See [link to relevant documentation]. Figure 10 The limiting member 412 serves as a conductive structure, achieving the same conductive function as the conductive member 403. That is, when the coiled wire 402 is retracted into the sheath tube 302, the cutter member 405 conducts electricity with the coiled wire 402 through the limiting member 412.

[0094] In some embodiments, the conductive part is a metal elastic tube. When the coiled wire 402 is retracted into the sheath 302, the cutter 405 contacts the metal elastic tube and conducts electricity. The metal elastic tube is an elastic tubular structure made of conductive metal. In some embodiments, the sheath 302 can be directly set as a metal elastic tube, taking into account both protection and conductivity functions, without the need for additional conductive components or other structures, simplifying the structure, simplifying assembly, and improving production efficiency.

[0095] Figure 11 This is a structural schematic diagram of the electric coil cutter shown in some embodiments accompanying this specification.

[0096] In some embodiments, such as Figure 11 As shown, the metal elastic tube includes a spring hose 413, which includes a first tube portion 4131 and a second tube portion 4132. The proximal end of the first tube portion 4131 is connected to the distal end of the second tube portion 4132. The first tube portion 4131 covers at least a portion of the periphery of the cutter 405. The radial inner diameter of the first tube portion 4131 is larger than the radial inner diameter of the second tube portion 4132. The inner wall of the spring hose 413 forms a stepped surface 4133 at the connection position of the first tube portion 4131 and the second tube portion 4132. When the coil wire 402 is retracted into the spring hose 413, the stepped surface 4133 abuts against the proximal end of the cutter 405. The coil wire 402 contacts the inner wall of the spring hose 413 through its own resilience, and the current on the coil wire 402 is transmitted to the cutter 405 through the spring hose 413. By setting the sheath 302 as a metal elastic tube and setting a first tube section and a second tube section, there is no need to set additional limiting components or other structures, which simplifies the structure, makes assembly simple, and improves production efficiency.

[0097] Figure 12 This is a structural schematic diagram of the outer sheath tube shown in some embodiments accompanying this specification.

[0098] In some embodiments, such as Figure 12 As shown, the electric snare incision knife also includes an outer sheath 304, which is movably sleeved outside the sheath 302. The outer sheath 304 can be controlled by medical personnel to move relative to the axial direction X of the sheath 302, improving the protection of the cutting blade 405 during endoscope insertion and withdrawal, and before use of the electric snare incision knife. By providing the outer sheath 304, moving the outer sheath distally during endoscope insertion and withdrawal protects the cutting blade and prevents damage to the endoscope.

[0099] In some specific embodiments, such as Figure 12As shown, the cutting blade 405 includes a first part 40501 and a second part 40502. The proximal end of the first part 40501 is connected to the distal end of the second part 40502. The first part 40501 extends axially, and the second part 40502 is disposed outside an insulating structure (such as an insulating tube 404). The radial dimension of the first part 40501 is smaller than the radial dimension of the second part 40502. The distal end face of the second part 40502 is coated with an insulating layer 4051. When using the cutting blade 405, since the first part 40501 extends outside the sheath tube 302, and the outer periphery of the second part 40502 is covered by the sheath tube 302, and since the distal end face of the second part 40502 is covered with the insulating layer 4051, energy is concentrated on the first part 40501 during mucosal cutting, thereby improving the mucosal cutting efficiency and effect.

[0100] Figure 13 This is a schematic diagram of the blade head structure according to some embodiments of this specification. Figure 14 This is a schematic diagram of the blade head structure according to other embodiments of this specification. Figure 15 This is a schematic diagram of the blade head structure according to some embodiments of this specification. Figure 16 This is according to some embodiments shown in this specification. Figure 15 BB section view.

[0101] In some embodiments, such as Figure 13 , Figure 14 and Figure 15 As shown, the cutter 405 includes a blade head 4055 disposed at the distal end of the cutter 405.

[0102] In some embodiments, the blade head 4055 includes one or more blades arranged circumferentially.

[0103] For example, the cutter head 4055 includes multiple blades arranged circumferentially. The multiple blades may be evenly or unevenly distributed circumferentially, and the shapes and sizes of the multiple blades may be the same or different.

[0104] For example, such as Figure 13 As shown, the blade head 4055 includes a blade 40551. The blade head 4055 is hook-shaped, and the end of the blade head 4055 forms an inclined incision, which facilitates the hooking of mucosal tissue after cutting open a relatively flat polyp, making it easier to inject and raise the polyp.

[0105] In some embodiments, such as Figure 14 As shown, the blade head 4055 is equipped with an insulating cap 40552. The insulating cap 40552 can be made of ceramic or other insulating materials. By setting the insulating cap 40552, the mucosal perforation phenomenon caused by the distal end of the blade head 4055 can be prevented when the mucosa is cut.

[0106] In some embodiments, such as Figure 15 and Figure 16 As shown, the cutter head 4055 is along the axial direction (e.g.) Figure 15 The cross-section of the polyp (in the X direction) is triangular, which can improve the efficiency of polyp tissue marking and mucosal incision.

[0107] Figure 17 This is a schematic diagram of the water injection channel and water passage shown in some embodiments of this specification.

[0108] In some embodiments, such as Figure 17 As shown, the cutting blade 405 has a water injection channel 4056. The water injection unit includes a water injection connector that connects to an external water source. The water injection connector communicates with the water injection channel 4056. Water is injected into the water injection channel 4056 through the water injection connector to achieve tissue elevation. Further details about the water injection unit can be found below. Figure 18 and Figure 19 Related descriptions.

[0109] In some embodiments, such as Figure 12 As shown, the water injection channel 4056 is a through hole opened in the first part 40501 of the cutter 405 along the axial direction X, and there is a gap 4054 between the cutter 405 and the insulating structure (such as the insulating tube 404).

[0110] In some embodiments, such as Figure 17 As shown, the second part 40502 of the cutter 405 has at least one water passage hole 4057. For example, there may be four water passage holes 4057, evenly distributed circumferentially in the second part 40502. Water introduced by the water injection connector flows through the sheath 302, enters the gap 4054 between the cutter 405 and the insulating structure through the water passage hole 4057, and then flows through the gap 4054 into the water injection channel 4056 inside the first part 40501. The water is then injected into the tissue through the water injection channel 4056, achieving tissue elevation.

[0111] The electric snare incision knife of some embodiments in this specification can realize electric marking, tissue resection and injection elevation. Polyp removal surgery can be completed with a single instrument. There is no need to frequently change injection equipment and other instruments during the operation. It has a simple structure and is easy to operate.

[0112] Figure 18 This is a schematic diagram of the overall structure of the electric coil cutter according to some embodiments of this specification. Figure 19 This is a schematic diagram of the overall structure of the electric coil cutter according to some embodiments of this specification. Figure 1 , Figure 5 , Figure 7-10 They can be considered separately as Figure 19 A magnified view of section K in the middle.

[0113] Some embodiments of this specification provide an electric coil cutter, such as Figure 18 As shown, the electric snare cutter includes a handle part 1, a sheath part 3, a water injection part 2, and a snare part 4.

[0114] The handle 1 is the control component for medical personnel to operate the electric coil incision knife. By using the handle, medical personnel can drive the internal structure of the electric coil incision knife to move by external force, thereby performing corresponding medical operations.

[0115] In some embodiments, such as Figure 19 As shown, the handle part 1 includes a handle 101, a sliding finger ring 102, an electrode 103, a push-pull rod 104, and a lock 105.

[0116] The handle 101 is for medical personnel to grip. A sliding ring 102 is fitted onto the handle 101 and can slide relative to the handle 101 in the axial direction X. The electrode 103 is inserted into the handle 101 and connected to the push-pull rod 104, which is connected to the sheath section 3.

[0117] The latch 105 is rotatably mounted on the sliding ring 102. In some embodiments, rotating the latch 105 switches between a tightened state and a loosened state. When the latch 105 is rotated to the tightened state, it presses against the handle 101, fixing the relative positions of the handle 101 and the sliding ring 102. When the latch 105 is rotated to the loosened state, it does not contact the handle 101, and the sliding ring 102 can slide along the axial direction X.

[0118] The water injection section 2 is used to inject liquid into the object to be operated on (such as human tissue) by the electric loop cutter. The water injection section 2 allows water from an external water source to be introduced into the electric loop cutter and injected into the human tissue to create a raised area, thereby forming a clear surgical operating space, facilitating subsequent resection and other operations by the surgeon, and reducing the risk of surgical perforation. In some embodiments, such as... Figure 19 As shown, the water injection unit 2 includes a water injection connector 201, a roller 202, a sealing ring fixing member 203, and a sealing ring 204.

[0119] Water inlet connector 201 is a housing structure for supporting and protecting the internal components of the water inlet section 2. Water inlet connector 201 can be connected to an external water source and introduce water from the external water source into the electric ring cutter. In some embodiments, water inlet connector 201 includes a water inlet 2011 through which an external water source is connected. In some embodiments, water inlet connector 201 is located at the distal end of handle 101.

[0120] The roller 202 is used by medical personnel to rotate and drive internal components. In some embodiments, the roller 202 is rotatably disposed in the water injection connector 201, and the roller 202 is connected to the push-pull rod 104, which can drive the push-pull rod 104 to rotate.

[0121] A sealing ring 204 is disposed in the water injection connector 201 and is interference-fitted with the water injection connector 201 to prevent water introduced from an external water source from flowing towards the proximal end of the electric ring cutter. A sealing ring retainer 203 is used to limit the sealing ring 204. In some embodiments, the sealing ring retainer 203 is fixedly connected to the water injection connector 201 to prevent the sealing ring 204 from dislodging. For example, the sealing ring retainer 203 and the water injection connector 201 can be fixedly connected by a snap-fit ​​interference fit, threaded connection, adhesive bonding, or other methods.

[0122] The sheath section 3 serves as the channel and carrier for the electric coil cutting knife. In some embodiments, such as... Figure 19 As shown, the sheath section 3 includes a heat-shrinkable tube 301, a sheath 302, and a traction rope 303. The heat-shrinkable tube 301 is used to connect the water injection connector 201 and the sheath 302. In some embodiments, the heat-shrinkable tube 301 is formed by heat shrinking to fix the water injection connector 201 and the sheath 302. The traction rope 303 is disposed inside the sheath 302 and is fixedly connected to the push-pull rod 104. The sliding ring 102 can slide along the axial direction X to drive the push-pull rod 104 to move, and the push-pull rod 104 further drives the traction rope 303 to move.

[0123] The snare section 4 is used to perform medical procedures such as resection.

[0124] In some embodiments, the loop portion 4 includes a coiled wire 402 and a cutter 405, and the handle portion 1 is connected to the coiled wire 402 via the sheath portion 3. In some embodiments, the traction rope 303 is connected to the coiled wire 402 and can drive the coiled wire 402 to move. At the same time, the electrode 103 can conduct electricity with the coiled wire 402 via the push-pull rod 104 and the traction rope 303. For example, sliding the sliding ring 102 along the axial direction X can drive the push-pull rod 104 and the traction rope 303, further driving the coiled wire 402 to move along the axial direction X; the roller 202 drives the push-pull rod 104 and the traction rope 303 to rotate, further driving the coiled wire 402 to rotate.

[0125] In some embodiments, the coiled wire 402 can be connected to the traction rope 303 through the connecting tube 401, and the connection method includes, but is not limited to, crimping, welding and other methods.

[0126] In some embodiments, the loop portion 4 further includes an insulating structure, a conductive element, and a limiting element, as described above for further details.

[0127] Some embodiments of this specification also provide a method for operating an electric snare cutter. The electric snare cutter includes a sheath, a coiled wire, a cutting blade, and an insulating structure. An insulating structure is provided between the coiled wire and the cutting blade. The coiled wire can be operably retracted into the sheath or extended out of the sheath. See the preceding text for a description of the electric snare cutter.

[0128] In some embodiments, the operating method includes: energizing the coil wire; controlling the coil wire to extend from inside the sheath to outside the sheath; when the coil wire extends out of the sheath, the coil wire and the cutting blade are insulated by an insulating structure; and controlling the coil wire to perform electrical cutting.

[0129] For example, when using the loop function of the electric loop cutter, the energized loop extends out of the sheath, allowing the loop to remove the polyp tissue. At this time, the cutter and the loop are insulated from each other, and the cutter will not discharge, thus avoiding damage to the surrounding normal polyp tissue.

[0130] In some embodiments, the electric coil cutter further includes a conductive part, as described above. The operating method also includes: controlling the coil wire to retract into the sheath; when the coil wire is retracted into the sheath, the coil wire and the cutter are electrically connected through the conductive part; and controlling the cutter to perform functions such as marking or electric cutting.

[0131] For example, when using the cutter to mark or cut tissue, the coil is retracted into the sheath. At this time, the cutter is pressed against the conductive part, and the coil will contact the conductive part under its own elasticity. At this time, the current on the coil flows into the cutter through the conductive part, and the cutter marks or electrically cuts the tissue.

[0132] In some embodiments, the electric coil cutter further includes a water injection section, the cutter having a water injection channel, and the water injection section including a water injection connector connected to an external water source, the water injection connector communicating with the water injection channel. See the preceding description for an explanation of the water injection section. The operating method further includes: controlling the coil to retract into the sheath; and injecting water into the water injection channel through the water injection connector. For example, when using the water injection function, water from an external water source is introduced into the water injection channel through the water injection connector of the water injection section, and then injected into human tissue through the water injection channel to cause tissue bulging.

[0133] When operating the electric loop cutter of some embodiments in this specification, multiple functions can be selected as needed; using the cutting blade function, mucosal cutting and injection of bulges can be performed; using the coil function, when performing polyp loop removal, the cutting blade and coil are insulated from each other, so that discharge will not cause damage to the surrounding normal tissue mucosa, reducing unnecessary damage and improving surgical results.

[0134] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0135] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0136] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0137] In some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account specified significant digits and employ a general method of digit preservation. Although the numerical ranges and parameters used to confirm their breadth of range in some embodiments of this specification are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0138] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. An electric coil cutter, characterized in that, It includes a sheath, a coiled wire, a cutter, and an insulating structure. The distal end of the coiled wire is connected to the cutter, and the insulating structure is provided between the coiled wire and the cutter. The coiled wire can be operably retracted into the sheath or extended out of the sheath. The sheath is provided with a conductive part. When the coiled wire is retracted into the sheath, the coiled wire is conductive to the cutter through the conductive part. When the coiled wire extends out of the sheath, the cutter is insulated from the coiled wire by the insulating structure. The insulating structure is an insulating tube, which is fixedly sleeved on the distal end of the coiled wire, and the cutting tool is connected to the insulating tube. Alternatively, the insulating structure is an insulating coating, with the distal end of the coiled wire covered by the insulating coating, and the cutter sleeved on the coiled wire at the position covered by the insulating coating; and / or, the proximal end of the cutter, at the position corresponding to the coiled wire, is covered by the insulating coating.

2. The electric coil cutter according to claim 1, characterized in that, When the insulating structure is an insulating tube, the cutter is sleeved outside the insulating tube; when the coiled wire is drawn into the sheath, the cutter is at least partially located between the insulating tube and the sheath in the radial cross-section of the sheath.

3. The electric coil cutter according to claim 1, characterized in that, It also includes a connector installed on the insulating tube. When the insulating structure is an insulating tube, the proximal end of the cutter is inserted into the insulating tube, and the connector connects to the proximal end of the cutter. When the coiled wire is retracted into the sheath, the conductive part is electrically connected to the cutter through the connector.

4. The electric coil cutter according to claim 3, characterized in that, The connector includes a connecting block and a connecting ring. The connecting block and the connecting ring cooperate to form a circular outer surface. The connecting block is inserted from one side of the insulating tube and connects to the proximal end of the cutter. The connecting ring is inserted from the other side of the insulating tube and fits against the insulating tube. The mating end faces of the connecting block and the connecting ring engage and fix the cutter to the insulating tube.

5. The electric coil cutter according to any one of claims 1-4, characterized in that, The conductive part is a conductive element fixedly disposed inside the sheath; along the axial direction, the distal end of the sheath is closer to the cutter part than the distal end of the conductive element; when the coiled wire is retracted into the sheath, the sheath covers at least a portion of the periphery of the cutter, the distal end of the conductive element abuts against the cutter, and the inner wall or proximal end of the conductive element contacts the coiled wire.

6. The electric coil cutter according to any one of claims 1-4, characterized in that, The conductive part is a limiting member disposed inside the sheath. The limiting member includes at least two limiting parts distributed along the axial direction and at least one elastic part, with at least one elastic part located between the at least two limiting parts. When the coiled wire is retracted into the sheath, the distal end of the limiting part located at the farthest end abuts against the proximal end of the cutter.

7. The electric coil cutter according to claim 6, characterized in that, The at least two limiting portions include a first limiting portion and a second limiting portion, and the elastic portion is located between the first limiting portion and the second limiting portion. The first limiting portion and the second limiting portion are metal rings, and the elastic portion is a metal spring. When the coiled wire is retracted into the sheath, the distal end of the first limiting part abuts against the proximal end of the cutter, and the inner wall or proximal end of the second limiting part contacts the coiled wire.

8. The electric coil cutter according to any one of claims 1-4, characterized in that, The conductive part is a metal elastic tube. When the coiled wire is retracted into the sheath, the cutter contacts the metal elastic tube and conducts electricity. The metal elastic tube includes a spring hose, which includes a first tube section and a second tube section. The proximal end of the first tube section is connected to the distal end of the second tube section. The first tube section covers at least a portion of the periphery of the cutter. The axial cross-sectional area of ​​the first tube section is larger than that of the axial cross-sectional area of ​​the second tube section. The inner wall of the spring hose forms a stepped surface at the connection position of the first tube section and the second tube section. When the coiled wire is drawn into the spring hose, the stepped surface abuts against the proximal end of the cutter.

9. The electric coil cutter according to claim 1, characterized in that, The cutting component includes a first part and a second part, the proximal end of the first part is connected to the distal end of the second part, the first part extends axially, the second part is disposed outside the insulating structure, the radial cross-sectional area of ​​the first part is smaller than the radial cross-sectional area of ​​the second part, and the distal end face of the second part is coated with an insulating layer.

10. The electric coil cutter according to claim 1, characterized in that, It also includes a handle, a sheath, and a water injection section; The sheath section includes a traction rope. The handle is connected to the loop wire via the traction rope; The cutting blade has a water injection channel, and the water injection part includes a water injection connector for connecting to an external water source. The water injection connector is connected to the water injection channel through the internal channel of the sheath.

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