Endoscopic surgical tool

Abstract

An endoscopic surgical tool comprising: a housing having a proximal end and a distal end, the housing comprising a central axis and a first bore forming an opening disposed at the distal end; an insulator having a central aperture and a second aperture, the insulator configured to extend distally from the housing along the central axis; and a knife disposed within the first bore and including a tip. The knife has a retracted position in which the knife extends distally from the first bore along the central axis and an extended position in which the knife retracts proximally along the central axis toward the proximal end. The endoscopic surgical tool includes a force application element coupled to the blade and applying force to the blade toward the retracted position when the blade is in the extended position. The endoscopic surgical tool according to the present application allows an operator or a surgeon to quickly perform the necessary surgery while preventing a knife from inadvertently perforating the GI tract.

Description

[0001] This application is a divisional application of the application filed on February 22, 2022, with application number 202210162876.0 and invention title "Endoscopic Surgical Tools".

[0002] Citation of relevant applications

[0003] This application claims the benefit and priority of U.S. Provisional Application No. 63 / 154,380, filed February 26, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0004] The present invention generally relates to an endoscopic surgical tool for use during endoscopic submucosal dissection, and more particularly, to an endoscopic surgical tool for removing tumors or tissues during endoscopic submucosal dissection. Background Technology

[0005] Endoscopic submucosal dissection (ESD) is a surgical procedure to remove tumors present in a patient's gastrointestinal (GI) tract. Currently, surgery to remove tumors in the GI tract requires the use of a needle-like instrument or a knife with an insulated tip. However, switching between instruments during the procedure can be cumbersome and increase the length of the procedure, including the time the patient is under anesthesia. Furthermore, existing instruments can include one or more of the following: surgical instruments with non-insulated tips providing high-frequency treatment (also known as needle-like instruments) and surgical instruments with insulated tips providing high-frequency treatment (also known as knives with insulated tips). However, in use, a needle-like instrument may protrude from the insulator of the knife, leading to GI tract or intestinal perforation. Summary of the Invention

[0006] The problem the invention aims to solve

[0007] During surgery, the needle-like blade of existing technology may protrude from the blade's insulator, leading to GI tract or intestinal perforation.

[0008] Solution for solving the problem

[0009] To address the aforementioned technical problems, the present invention provides an endoscopic surgical tool comprising: a housing having a proximal end and a distal end, the housing including a central axis and a first hole forming an opening disposed at the distal end; an insulator including a central opening and a second hole, the insulator being configured to extend distally from the housing along the central axis; a blade disposed within the first hole and including a distal end, the blade having a retracted position and an extended position, wherein, in the extended position, the blade extends distally from the first hole along the central axis, and in the retracted position, the blade retracts proximally towards the proximal end along the central axis; and a force-applying element coupled to the blade, and when the blade is in the extended position, the force-applying element applies force to the blade toward the retracted position.

[0010] Preferably, the housing comprises a plate, and the force-applying element connects the blade to the plate.

[0011] Preferably, the plate includes a plate hole, the plate hole being sized and shaped to allow a portion of the knife to pass through.

[0012] Preferably, the force-applying element extends along the central axis, and the force-applying element includes a first end connected to the blade and a second end connected to the plate.

[0013] Preferably, the plate is arranged close to the proximal end of the housing.

[0014] Preferably, the plate is fixed relative to the rest of the housing and arranged inside the housing.

[0015] Preferably, the distal end of the insulator includes a groove extending proximally along the central axis.

[0016] Preferably, the blade includes a cutting surface and a distal portion, the distal portion being disposed between the end and the cutting surface.

[0017] Preferably, the insulator has an extended insulator position in which the insulator extends distally from the housing along the central axis, and the insulator in the extended insulator position causes the knife to be in the extended position.

[0018] Preferably, the knife includes a bar disposed between a first cutting edge and a second cutting edge, wherein the length of the first cutting edge is greater than the length of the second cutting edge.

[0019] Preferably, the endoscopic surgical tool is configured for use in a needle-like blade configuration and a blade configuration with an insulator at the end.

[0020] Preferably, the blade includes a rod and at least one cutting section, the rod being arranged along the central axis.

[0021] Preferably, the force-applying element is a spring.

[0022] Preferably, the housing comprises a substantially flexible material.

[0023] Preferably, the end is an electrode.

[0024] Preferably, the size and shape of the first hole are configured to receive the insulator.

[0025] Preferably, the end of the blade includes a generally concave outer surface.

[0026] Preferably, the insulator includes a generally concave outer surface.

[0027] The present invention also provides an endoscopic surgical tool comprising: a housing including a plate arranged proximally and a first aperture defining an opening arranged proximally, the housing further including a central axis substantially perpendicular to the plate; an insulator including a central opening, a recess, and a second aperture, the insulator being configured to extend distally from the housing along the central axis; a blade disposed within the first aperture and including an end tip, the blade having a retracted position and an extended position, wherein in the extended position the blade extends distally from the first aperture along the central axis, and in the retracted position the blade retracts proximally along the central axis toward the proximal end, the end tip being sized and shaped to sit within the recess of the insulator; and a force-applying element having a first end and a second end, the first end being coupled to the blade and the second end being coupled to the plate, the force-applying element applying force to the blade toward the retracted position when the blade is in the extended position.

[0028] The present invention also provides an endoscopic surgical tool comprising: a housing including a single sheath made of a substantially flexible material, the housing further including a plate arranged proximally and an aperture defining an opening arranged proximally, the housing further including a central axis substantially perpendicular to the plate, the plate including a plate hole; an insulator including a central opening, a groove, and an insulator hole, the insulator being configured to extend distally from the housing along the central axis, the insulator having an extended insulator position and a retracted insulator position, the extended insulator position being the case where the insulator extends distally from the housing, and the retracted insulator position being the case where the insulator retracts proximally toward the proximal end; and a blade including a bar surrounded by a first cutting edge and a second cutting portion, the blade being positioned along... The central axis is arranged within the hole. The blade includes an electrode and has a retracted position and an extended position. In the extended position, the blade extends distally from the hole along the central axis. In the retracted position, the blade retracts proximally along the central axis toward the proximal end. The electrode is sized and shaped to sit within a groove in the insulator. The first cutting edge is arranged to pass through the plate hole and has a length greater than the length of the second cutting portion. A spring has a first end and a second end, the first end being connected to the rod and the second end being connected to the plate along the central axis. When the blade is in the extended position and the insulator is in the extended insulator position, the spring applies force to the blade toward the retracted position.

[0029] The effects of the invention

[0030] According to the present invention, endoscopic surgical tools allow operators or surgeons to quickly perform necessary procedures while preventing unintentional perforation of the GI tract by the scalpel. Attached Figure Description

[0031] The following detailed description of embodiments of the endoscopic surgical tool will be better understood when read in conjunction with the accompanying drawings of exemplary embodiments. However, it should be understood that the invention is not limited to the precise configurations and mechanisms shown.

[0032] Figures 1A to 1C This is an illustration of existing endoscopic surgical tools.

[0033] Figures 2A to 2B This is an illustration of existing endoscopic surgical tools.

[0034] Figure 3 This is a cross-sectional view of an exemplary endoscopic surgical tool according to an embodiment of the present invention, shown in a partially extended position.

[0035] Figure 4 It is shown as being in the retracted position. Figure 3Cross-sectional view of endoscopic surgical instruments.

[0036] Figure 5 It is shown as being in the extended position. Figure 3 Cross-sectional view of endoscopic surgical instruments.

[0037] Figure 6A yes Figures 3 to 5 A side view of an exemplary scalpel of an endoscopic tool.

[0038] Figure 6B yes Figures 3 to 5 A side view of an exemplary insulator and cutting surface of an endoscopic tool.

[0039] Figure 7A It is cut along the AA axis. Figure 5 Cross-sectional view of endoscopic surgical instruments.

[0040] Figure 7B It is cut along the BB axis. Figure 5 Cross-sectional view of endoscopic surgical instruments.

[0041] Figure 8 The operation line is shown. Figure 3 Cross-sectional view of endoscopic surgical instruments.

[0042] Figure 9 It shows the additional operation lines. Figure 8 Cross-sectional view of endoscopic surgical instruments.

[0043] Figure 10A It is shown as being in a knife-like state. Figure 3 Cross-sectional view of endoscopic surgical instruments.

[0044] Figure 10B It is shown as being in an intermediate state. Figure 3 Cross-sectional view of endoscopic surgical instruments.

[0045] Figure 10C It is shown as being in an insulating state. Figure 3 Cross-sectional view of endoscopic surgical instruments.

[0046] Figure 11A yes Figure 10A Cross-sectional view of endoscopic surgical instruments.

[0047] Figure 11B yes Figure 10A A three-dimensional view of the opened endoscopic surgical instruments.

[0048] Figure 12A yes Figure 10B Cross-sectional view of endoscopic surgical instruments.

[0049] Figure 12Byes Figure 10B A three-dimensional view of the opened endoscopic surgical instruments.

[0050] Figure 13A yes Figure 10C Cross-sectional view of endoscopic surgical instruments.

[0051] Figure 13B yes Figure 10C A three-dimensional view of the opened endoscopic surgical instruments. Detailed Implementation

[0052] Reference Figures 1A to 2B Existing endoscopic surgical tools have been used to perform endoscopic submucosal dissection (ESD) and remove tumors. For example... Figures 1A to 1C As shown, a known endoscopic surgical tool 1 may include a sheath 3, a blade 5, and an insulator 11. The insulator 11 includes an aperture 9, and the blade 5 can extend through the aperture 9 of the insulator 11. The user can use the endoscopic surgical tool 1 in one of two configurations: a needle-blade configuration (…). Figure 1B and Figure 2A ) and a knife-shaped structure with an insulator at the end ( Figure 1C and Figure 2B For example, a user can use the endoscopic surgical tool 1 with a needle-knife configuration, wherein the blade 5 protrudes through a hole 9 in the insulator 11 and the insulator 11 remains within the sheath 3. The needle-knife configuration can be used for slow and careful procedures to allow for precise cutting and resection. A user can also use the endoscopic surgical tool 1 with a blade configuration having an insulator at the end, wherein the blade 5 and the insulator 11 extend fully from the distal end of the endoscopic surgical tool 1.

[0053] In some embodiments, the tip 7 of the blade 5 is disposed within an insulator 11, and the insulator 11 serves to prevent the blade 5 from perforating the tissue. Blade configurations with insulated tips can be used for rapid procedures. However, in practice, for example, during rapid dissection, the blade 5 and / or tip 7 of an endoscopic surgical tool 1 in a blade configuration with insulated tips may inadvertently extend through the insulator 11, resulting in accidental perforation of the tissue or GI tract. For example, when an endoscopic surgical tool 1 is in a blade configuration with insulated tips and is used hastily or for rapid dissection, the endoscopic surgical tool 1 may have an increased risk of GI tract perforation compared to slow use of an endoscopic surgical tool 1 in a blade configuration with insulated tips or a needle-knife configuration. Regardless of how the tip 7 moves, the blade 5 may inadvertently extend through the insulator 11 and may cause perforation of the tissue or GI tract. GI tract perforation can cause severe pain, sepsis, internal bleeding, or other damage.

[0054] Reference Figures 2A to 2BThe endoscopic surgical tool 1 may include a sheath 3. The sheath 3 may include an inner layer 3a and an outer layer 3b. The inner layer 3a may be disposed within the outer layer 3b to provide protection for the blade 5 and to provide rigidity to the endoscopic surgical tool 1. The inner layer 3a and the outer layer 3b may also provide a housing for the internal wires and components of the endoscopic surgical tool 1. In some embodiments, the sheath 3 comprising two layers (inner layer 3a and outer layer 3b) results in the endoscopic surgical tool 1 being substantially rigid, which prevents the endoscopic surgical tool 1 from bending when passing through an endoscope disposed in a lumen such as the GI channel. For example, the sheath 3 comprising two layers (inner layer 3a and outer layer 3b) stiffens the endoscopic surgical tool 1, thereby reducing and / or inhibiting bending of the endoscope into which the endoscopic surgical tool 1 is inserted.

[0055] An exemplary embodiment of the present invention provides an endoscopic surgical tool. An embodiment of the present invention provides an exemplary endoscopic surgical tool 200, such as... Figures 3 to 9 As shown. In use, the endoscopic surgical tool 200 can help remove tumors located within the GI tract. Specifically, the endoscopic surgical tool 200 can be used to cut and remove tumors located along the GI tract during procedures such as ESD surgery. The endoscopic surgical tool 200 may include a needle-knife configuration also known as a double-knife configuration (…). Figure 3 ) and also a knife structure with an insulator at the end, also known as an insulated end (IT) knife structure. Figure 5 ).For example, Figure 3 The double-blade design allows the insulator to remain within the housing when the blades are extended. In contrast, Figure 5 A needle-knife configuration with an insulator at the end allows the blade's tip to be positioned within a groove in the insulator when both the insulator and the blade extend away from the housing. A needle-knife configuration can be used for slow and precise removal of tissue such as tumors, while a needle-knife configuration with an insulator at the end can be used for rapid and sweeping removal of tissue or tumors. For example, compared to a needle-knife configuration with an insulator at the end, a needle-knife configuration without an insulator in the extended position allows the operator or surgeon to visualize portions of tumor or tissue that need to be dissected and removed along the GI pathway. The needle-knife configuration allows the operator or surgeon to slowly dissect tissue or tumors, which is crucial in cases of anticipated bleeding, such as during ESD procedures.

[0056] In practice, when using an endoscopic surgical instrument 200 with a needle-like blade configuration, the operator or surgeon can proceed slowly to prevent the blade from unintentionally perforating the GI tract. In contrast, a blade configuration with an insulator at the distal end allows the operator or surgeon to quickly remove tumors or tissue without worrying about unintentional perforation of the GI tract. For example, an insulator positioned at the distal end of the blade prevents unintentional perforation of the GI tract, allowing the operator or surgeon to perform the necessary procedures quickly.

[0057] like Figures 3 to 5 As shown, the endoscopic surgical instrument 200 may include a housing 202, a blade 204, an insulator 210, a biasing element 216, and a plate 218. The housing 202 may include an imaginary axis extending along its central length, a central axis 205. The housing 202 may also include an opening or aperture 219, a proximal end 220, and a distal end 222. The proximal end 220 may be arranged opposite to the distal end 222. The blade 204 may be arranged within the housing 202 along the central axis 205, and the insulator 210 may be located distally adjacent to the blade 204. The blade 204 may be arranged through the insulator 210 and may include a tip 206. The insulator 210 and the blade 204 may be configured to extend distally along the central axis 205 away from the housing 202 and the opening 219, and to retract proximally along the central axis 205 toward the housing 202 and the opening 219. In some embodiments, the opening 219 is arranged at the distal end 222 and the plate 218 is arranged close to the proximal end 220.

[0058] In some embodiments, the blade 204 may include a handle 212, a cutting face 207, and a distal portion 211. The blade 204 may include cutting edges 214a and 214b that may surround the handle 212. In some embodiments, the cutting edges 214a and 214b include the cutting face 207. In some embodiments, the blade 204, including the distal portion 211 and the cutting face 207, is configured to cut and / or ablate tissue. For example, the distal portion 211 and the cutting face 207 may be configured to be heated or receive an electric current to ablate tissue, and may include a blade or sharp edge to cut tissue, or may include a laser or other element capable of cutting and / or ablating tissue. The cutting face 207 may be configured to extend proximally from the distal end of the distal portion 211, and the distal portion 211 may be disposed between the distal end 206 and the cutting face 207. For example, the handle 212 and the cutting edges 214a, 214b may extend proximally from the distal end of the distal portion 211. However, the distal portion 211 may include a rod 212 and / or cutting blades 214a, 214b. In one embodiment, the distal portion 211 includes an integral cutting blade instead of the rod 212 and cutting blades 214a, 214b. The blade 204 may be configured to extend along the central axis 205 through the insulator 210 via the hole 208. In some embodiments, the insulator 210 is disposed within the housing 202 and configured to extend distally along the central axis 205 away from the housing 202. For example, the insulator 210 may be disposed adjacent to the distal end 222 of the housing 202 and may be disposed within and extend through the opening 219 of the housing 202. The plate 218 may be disposed within the housing 202 adjacent to the proximal end 220. In some embodiments, the force-applying element 216 is configured to attach the blade 204 to the plate 218.

[0059] In some embodiments, housing 202 may include an opening 219 located at a distal end 222. Opening 219 may allow the blade 204 and insulator 210 to selectively extend and retract into housing 202 along a central axis 205. For example, the blade 204 and insulator 210 may be arranged within the interior 226 of housing 202 along the central axis 205 and may be configured to extend distally through opening 219. For example, the blade 204 may have an extended position and a retracted position. In the extended position ( Figure 5 In the retracted position, the blade 204 can extend distally from the opening 219 along the central axis 205. Figures 3 to 4 In this configuration, the blade 204 can retract proximally along the central axis 205 toward the proximal end 220. In some embodiments, the insulator 210 has an extended insulator position and a retracted insulator position. In the extended insulator position ( Figure 5 In the retracted position, the insulator 210 can extend distally from the opening 219 along the central axis 205. Figure 3 In this configuration, the insulator 210 can retract proximally along the central axis 205 toward the proximal end 220 and can be arranged within the housing 202.

[0060] In some embodiments, the housing 202 is made of polytetrafluoroethylene (PTFE). However, the housing 202 may be made of other materials, such as polymers, copolymers, rubber, or vinyl. The housing 202 may be made of a biocompatible material. In some embodiments, the housing 202 is made of a non-conductive material. The housing 202 may have an inner diameter between approximately 1.5 mm and approximately 3.0 mm, an outer diameter between approximately 1.5 mm and 3.5 mm, a wall thickness between approximately 0.05 mm and 0.5 mm, and a length between approximately 500 mm and 3000 mm. In some embodiments, the housing 202 is made of PTFE with a thickness of approximately 0.45 mm. However, the housing 202 may have a thickness between 0.1 mm and 0.5 mm. In some embodiments, the size and shape of the housing 202 can be set to any desired length. For example, the housing 202 may be longer to allow the endoscopic surgical instrument 200 to enter deeper into the GI tract to remove tissue or tumors within a deeper portion of the GI tract.

[0061] In some embodiments, the housing 202 is typically flexible to allow the endoscopic surgical tool 200 to navigate within the GI channel. The housing 202 may include a single sheath of non-rigid material that allows the endoscopic surgical tool 200 to bend around the curvature of the GI channel. For example, the housing 202 may include a flexible material forming a single sheath. However, the housing 202 may include more than one material sheath. In some embodiments, the housing 202 is coupled to an actuator (not shown) to allow a user or surgeon to control the endoscopic surgical tool 200. The actuator may be configured to extend and retract the blade 204 and the insulator 210. For example, the actuator may be configured to extend one or both of the blade 204 and the insulator 210 and lock the blade 204 and the insulator 210 in a desired position.

[0062] Reference Figure 3 and Figure 4 The endoscopic surgical instrument 200 may include a blade 204 arranged within a housing 202 along a central axis 205. In fact, when the endoscopic surgical instrument 200 is in a needle-knife configuration ( Figure 3 ) or a knife-shaped structure with an insulator at the end ( Figure 5 When performing endoscopic surgery, scalpel 204 is used. Scalpel 204 can be used to cut / cauterize desired tissue and / or tumor. For example, scalpel 204 can be used to cauterize tumors found along the GI tract by placing scalpel 204 adjacent to the tumor and cauterizing the tumor, allowing the tumor to be dissected and removed from the GI tract. Endoscopic surgical instrument 200 can utilize cauterization to prevent bleeding and massive hemorrhage within the GI tract. However, scalpel 204 can be configured to cut tissue only without cauterization.

[0063] Reference Figure 3 and Figure 5The blade 204 may include a cutting surface 207, a distal portion 211, and a tip 206. The tip 206 may be disposed distal to the distal end of the distal portion 211 of the blade 204 and may have a length between approximately 0.25 mm and 2.5 mm. The distal portion 211 may be disposed adjacent to the tip 206 and may be disposed between the tip 206 and the cutting surface 207. The cutting surface 207 may be disposed adjacent to the distal portion 211. The distal portion 211 of the blade 204 can be used when the endoscopic surgical instrument 200 is in a needle-blade configuration. When the endoscopic surgical instrument 200 is in a needle-blade configuration, the insulator 210 may remain disposed within the housing 202, and the distal portion 211 may extend away from the insulator 210 and the housing 202 through a hole 208 in the insulator 210. The distal portion 211 can extend away from the insulator 210 and the housing 202, exposing the tip 206 and the distal portion 211, which allows the distal portion 211 to contact and cut / burn the desired tissue. In a needle-like blade configuration, the cutting face 207 can remain disposed within the insulator 210 and the housing 202, while the distal portion 211 and the tip 206 extend out of the housing 202. In a blade configuration with an insulator at the tip, the tip 206 and the distal portion 211 can be disposed within the insulator 210, which can extend away from the opening 219 and the housing 202. Furthermore, in a blade configuration with an insulator at the tip, the cutting face 207 can be exposed to allow the cutting face 207 to contact and cut / burn the desired tissue.

[0064] Reference Figures 3 to 5In some embodiments, the cutting surface 207 is connected to the distal end of the insulator 210. The cutting surface 207 may include a rod 212, which may be surrounded by cutting blades 214a, 214b. The cutting blades 214a, 214b may include blades, wires, sharp points, conductive material for cauterization, or other surfaces configured to cut through tissue. The rod 212 may be arranged along the central axis 205 of the housing. The cutting blades 214a, 214b may completely surround the rod 212 circumferentially, such that the cutting blades 214a and 214b form a column surrounding the rod 212 to form the cutting surface 207. The cutting blades 214a, 214b may completely surround the rod 212 to form a smooth and clean cutting and cauterizing surface around the periphery or circumference of the cutting surface 207. In some embodiments, the cutting blades 214a, 214b may be circumferentially connected together around the rod 212. However, the cutting surface 207 may include a single integral cutting edge surrounding the rod 212. The cutting edges 214a and 214b may be coupled or one-piece, such that only one of the cutting edges 214a or 214b needs to be connected to a wire supplying current to the cutting surface 207 and / or the blade 204. In some embodiments, the length of the cutting edge 214a of the cutting surface 207 is greater than that of the cutting edge 214b of the cutting surface 207. For example, the cutting edge 214a may extend downwards completely along most of the length of the housing 202 and through the plate 218, while the cutting edge 214b may extend downwards only partially along the length of the housing 202 and terminate before the plate 218.

[0065] In some embodiments, the cutting surface 207 includes more than two cutting edges. For example, the cutting surface 207 may include three, four, five, six, or more than six cutting edges. In some embodiments where the cutting surface 207 includes more than two cutting edges, each cutting edge may have a portion adjacent to the distal end 222 that is wider than the portion adjacent to the proximal end 220. Each cutting edge 214a, 214b having a wider portion adjacent to the distal end 222 compared to the narrower portion adjacent to the proximal end 220 allows the cutting surface 207 to have a continuous circumferential direction, preventing gaps from forming along the circumference or periphery of the cutting surface 207.

[0066] In some embodiments, cutting edge 214a extends through plate 218 to be coupled to a power source for supplying current to cutting edge 214a and / or cutting edge 214b. For example, cutting edge 214a may extend through plate 218 to be coupled to a power source, and cutting edge 214a may be electrically coupled to or in contact with cutting edge 214b such that cutting edge 214b is also coupled to a power source. In some embodiments, cutting edges 214a, 214b include a conductive material to allow blade 204 to ablate tissue. In some embodiments, end 206 is disposed at the distal end of blade 204 to allow high-frequency current to flow through blade 204, thereby allowing blade 204 to be used as an electrode for ablation.

[0067] In a preferred embodiment, the blade 204 comprises stainless steel. For example, the rod 212 and the cutting blades 214a, 214b may comprise stainless steel. However, the blade 204 may comprise other conductive materials. In some embodiments, the blade 204 is configured to extend from and retract into the housing 202 through a hole 208 in the insulator 210 that may be disposed within the housing 202. For example, the distal portion 211 of the blade 204 may be configured to partially extend out of the housing 202 through the insulator 210. Figure 3 The distal portion 211 and the cut surface 207 can extend completely out of the outer casing 202 together with the insulator 210. Figure 5 And when the insulator is arranged adjacent to the opening 219 of the housing 202, the distal portion 211 and the cut surface 207 can retract into the insulator 210. Figure 4 The distal portion 211 of the blade 204 can partially extend beyond the outer casing 202, so that the endoscopic surgical instrument 200 is in a needle-knife configuration. Figure 3 This allows the distal portion 211 to contact the desired tissue. For example, the blade 204 may extend partially, allowing the distal portion 211 and tip 206 of the blade 204 to be exposed to the desired tissue. The distal portion 211 of the blade 204 may extend partially beyond the housing 202, while the insulator 210 remains disposed within the housing 202.

[0068] In practice, the operator or surgeon can use an actuator (not shown) to control the extension of the blade 204. For example, during use of the endoscopic surgical instrument 200 in a needle-blade configuration, the operator or surgeon can engage the actuator to extend the blade 204 such that only the distal portion 211 and the tip 206 extend away from the opening 219 and the housing 202 and are thus exposed. In some embodiments, the tip 206 of the blade 204 extends between 1.5 mm and 2 mm away from the insulator 210 in the needle-blade configuration. Figure 3 This results in the distal portion 211 being between 1.5 mm and 2 mm in length. For example, in a needle-like blade configuration, the blade 204 may extend only such that the distal portion 211 and the end 206 are exposed, and the cutting surface 207 and the remainder of the blade 204 are disposed within the insulator 210, which is disposed within the housing 202. When in the needle-like blade configuration, the distance between the end 206 and the insulator 210, and therefore the length of the distal portion 211, can be between 0.5 mm and 3 mm, between 0.75 mm and 2.5 mm, and between 1 mm and 2 mm. In some embodiments, the length of the insulator 210 is between 3 mm and 4 mm. However, it can be between 2 mm and 5 mm, between 2.5 mm and 4.5 mm, or between 3 mm and 3.5 mm.

[0069] In some embodiments, the blade 204 is arranged to pass through the insulator 210. The insulator 210 may include a hole 208 defined by an opening and a central opening 215 arranged along a central axis 205, and the blade 204 may be configured to travel through the central opening 215 and enter and exit the hole 208. For example, the blade 204 may be configured to pass through the hole 208 and the central opening 215 when extending out of and retracting into the housing 202. In practice, when in a needle-like blade configuration, the distal portion 211 of the blade 204 may partially extend out of the housing 202 and the insulator 210. Figure 3 In some embodiments, the insulator 210 has a maximum diameter of approximately 5 mm. However, the insulator 210 may have a maximum diameter between 0.5 mm and 5 mm, between 1 mm and 3.5 mm, or between 1.5 mm and 3 mm. Furthermore, the insulator 210 may have a length of approximately 5 mm. However, the insulator 210 may have a length between 0.5 mm and 5 mm, between 0.75 mm and 3 mm, between 1 mm and 2.5 mm, or between 1.5 mm and 2 mm. In some embodiments, the insulator 210 comprises a non-conductive material such as ceramic. However, the insulator 210 may comprise PTFE, polymers, copolymers, rubber, or other non-conductive materials. The insulator 210 may be made of an insulating material or may be made of a conductive or non-conductive material having an insulating coating. In some embodiments, the outer surface of the insulator 210 may be substantially smooth to allow the insulator 210 to contact tissue without damaging or harming the tissue.

[0070] In some embodiments, the insulator 210 includes a recess 224. The recess 224 may be sized and shaped to receive the end 206 when the blade 204 is in a retracted position or when the insulator 210 extends distally along the blade 204 away from the opening 219. For example, the insulator 210 may extend distally with the blade 204 locked in a fixed position, causing the insulator 210 to travel distally along the blade 204 and / or along the central axis 205. The recess 224 may be disposed at the distal end of the insulator 210 and may extend proximally from the distal end of the insulator 210 along the central axis 205. In some embodiments, the blade 204 may be in a retracted position and disposed within the insulator 210, which may initially be disposed within the housing 202. For example, the end 206 may be disposed within the recess 224 such that when the insulator 210 extends distally, the end 206 and the blade 204 also extend distally.

[0071] Reference Figures 3 to 5The radius of the groove 224 can be larger than the radius of the end 206, and the depth can be greater than the length of the end 206. For example, the end 206 may have a radius between approximately 0.25 mm and 1.5 mm and a length between approximately 0.10 mm and 0.5 mm. In some embodiments, the groove 224 has a depth of approximately 0.5 mm or greater. For example, the groove 224 may have a depth between 0.2 mm and 2.5 mm, between 0.5 mm and 2 mm, or between 1 mm and 1.5 mm, or greater than 0.5 mm. The groove 224 can be configured to prevent the blade 204 from further retracting into the housing 202 by preventing the end 206 from moving proximally once the end 206 is positioned within the groove 224. For example, the diameter of the groove 224 may be larger than the central opening 215, thereby preventing the end 206 from retracting proximally through the groove 224. In some embodiments, the tip 206 of the blade 204 is disposed within the recess 224 and the insulator 210 extends distally, such that the insulator 210 pushes the tip 206 and the blade 204 distally. For example, when the tip 206 of the blade 204 is disposed within the recess 224, the extension of the insulator 210 may cause the blade 204 to extend due to the insulator 210 pushing against the tip 206. The tip 206 being disposed within the recess 224 may result in the distal portion 211 being disposed using the central opening 215. For example, in a blade configuration with an insulator at the tip, when the insulator 210 extends distally away from the housing 202, the tip 206 may be disposed within the recess 224 and the distal portion 211 may be disposed within the central opening 215 of the insulator 210, resulting in the cutting surface 207 being exposed and able to contact the desired tissue.

[0072] Reference Figure 6A and Figure 6B The dimensions and shape of the insulator 210 can be incorporated into the housing of the blade 204. For example, the distal portion 211 of the blade 204 can be disposed within and extend through the central opening 215 of the insulator 210. In some embodiments, the distal portion 211 has a diameter D1, and the rod 212 has a diameter D2. The diameter D1 can be between approximately 0.2 mm and 0.8 mm, and the diameter D2 can be between approximately 0.05 mm and 0.5 mm. The diameter D1 can be larger than the diameter D2. The diameter D1 can be approximately 0.4 mm. However, the diameter D1 can be between 0.1 mm and 2 mm, between 0.3 mm and 0.6 mm, or between 0.5 mm and 1 mm. In some embodiments, the diameter D1 of the distal portion 211 is the same as the diameter of the cutting surface 207. In some embodiments, the diameter D2 of the rod 212 plus the thickness of the cutting edges 214a, 214b equals the diameter D1. See reference. Figure 6BThe central opening 215 may have a diameter D3, which may be larger than the diameter D1. For example, the diameter D3 may be larger than the diameter D1 by a delta Δ. The diameter D3 may be between approximately 0.25 mm and 0.75 mm. In some embodiments, the endoscopic surgical tool 200 has a diameter D4. The diameter D4 may be equal to the diameter D2 plus the delta Δ to ensure sufficient space for the cutting face 207 to move longitudinally along the central axis 205 through the central opening 215. For example, the diameter D4 may be smaller than the diameter D3 of the central opening 215. In some embodiments, the diameter D4 is between approximately 0.05 mm and 0.5 mm. In some embodiments, the delta Δ is between approximately 0.01 mm and 0.05 mm. The delta Δ may allow a gap between the cutting face 207 and the interior of the central opening 215 for adding, for example, an adhesive (such as glue or adhesive) along its natural length when the insulator 210 is in the retracted position. When the insulator 210 is in the extended insulator position, the force-applying element 216 can become elongated. In the extended position, the force-applying element 216 provides a biasing force to the blade 204 and the end 206, pulling the blade 204 and the end 206 toward the proximal end 220.

[0073] In an alternative embodiment, the rod 212 may extend through the plate 218 and the force-applying element 216 may be coupled to the proximal side 243 of the plate 218 such that the force-applying element 216 is coupled to the rod 212 adjacent to the proximal side 243 of the plate 218. For example, the force-applying element 216 may be coupled to the proximal side 243 of the plate 218 such that the force-applying element 216 extends to the proximal end 220 and is configured to push the rod 212 toward the proximal end 220. The coupling of the force-applying element 216 to the proximal side 243 of the plate 218 and its configuration to push the rod 212 toward the proximal end 220 can prevent the knife 204 and the end 206 from unintentionally protruding through the insulator 210.

[0074] Reference Figures 3 to 5 The endoscopic surgical tool 200 can be configured in a needle-knife configuration ( Figure 3 ) and a knife-shaped structure with an insulator at the end ( Figure 5 When the distal portion 211 and tip 206 of the blade 204 extend beyond the insulator 210 and away from the opening 219, the endoscopic surgical instrument 200 can be in a needle-blade configuration. For example, the needle-blade configuration may allow the insulator 210 to remain within the housing 202 while the blade 204 extends distally from the opening 219. In the needle-blade configuration, the distal portion 211 of the blade 204 is prevented from retracting into the housing 202 via an actuator (not shown). In practice, in order to exit the needle-blade configuration ( Figure 3 ) to a knife structure with an insulator at the end ( Figure 5An actuator (not shown) is used to extend the insulator 210. The insulator 210 can extend away from the opening 219, such that the end 206 of the blade 204 is arranged within the groove 224 of the insulator, as... Figure 4 As shown. The end 206 can contact and become arranged within the groove 224 because the insulator 210 extends away from the opening 219 and the housing 202, while the distal portion 211 of the blade 204 does not extend or retract, causing the groove 224 of the insulator 210 to contact the end 206. As the insulator 210 continues to extend distally away from the opening 219, the insulator 210 pushes the end 206 distally away from the opening 219, causing the blade 204 to extend distally together with the insulator 210, as... Figure 5 As shown.

[0075] In some embodiments, the force-applying element 216 applies a biasing force to the end 206 and the blade 204 such that the end 206 remains in the recess 224 when the insulator 210 extends away from the opening 219 and the housing 202. For example, the biasing force of the force-applying element 216 pulling the end 206 toward the proximal end 220 acts in opposition to the force of the insulator 210 extending the end 206 distally away from the opening 219. In some embodiments, when the insulator 210 extends distally, the biasing force of the force-applying element 216 is less than the force of the insulator 210 on the end 206, allowing the insulator 210 to extend distally while the end 206 is still being forceped toward the proximal end 220. The insulator 210 can be locked in the extended position during use, and the biasing force of the force-applying element 216 on the end 206 of the blade 204 pulls the end 206 into the recess 224, thereby preventing the end 206 and the blade 204 from unintentionally protruding.

[0076] In some embodiments, when the insulator 210 extends away from the opening 219 to be in the locked and extended position, the force-applying element 216 connecting the plate 218 and the rod 212 becomes elongated. The elongation of the force-applying element 216 creates a biasing force that pulls the rod 212 toward the proximal end 220. The biasing force of the force-applying element 216 pulling the rod 212 toward the proximal end 220 causes the end 206 of the blade 204 to remain within the groove 224.

[0077] Reference Figures 3 to 5 as well as Figures 7A to 7BThe force-applying element 216 can be coupled to the plate 218. The plate 218 can comprise a rigid or hard material, such as metal, steel, resin, or polymer. The plate 218 can be circular and can be disposed within the interior 226 of the housing 202. However, the plate 218 can be rectangular, elliptical, square, triangular, semi-circular, or any other desired shape. In some embodiments, the plate 218 has a diameter substantially the same as the inner diameter of the housing 202. In some embodiments, the plate 218 extends around the entire inner circumference of the housing 202 and can have a diameter smaller than the outer diameter of the housing 202. However, the plate 218 may extend only a portion of the inner circumference of the housing 202. For example, the plate 218 may extend only between 10° and 345°, between 45° and 300°, between 90° and 270°, between 120° and 225°, or between 180° and 200°. The plate 218 can be disposed within the housing 202 such that the plate 218 is substantially perpendicular to the central axis 205. In some embodiments, plate 218 has a thickness between approximately 0.5 mm and 5 mm. The thickness of plate 218 can be designed to not interfere with the bending of endoscopic surgical tool 200. In some embodiments, plate 218 is configured to fix and stabilize the cutting surface 207 including rod 212 and cutting blades 214a, 214b, thereby preventing unintentional lateral movement.

[0078] In some embodiments, plate 218 includes plate openings or plate holes 230. Plate 218 may include more than one plate opening 230. For example, plate 218 may include two, three, four, five, or six plate openings 230 arranged around plate 218. In some embodiments, plate 218 may include more than one plate opening 230 to allow multiple cutting blades to extend through plate 218. In some embodiments, the endoscopic surgical tool 200 includes multiple cutting blades and more than one cutting blade may be arranged to extend through more than one plate opening 230. In some embodiments, plate 218 may have more than one plate opening 230 and each plate opening 230 may be equidistant from adjacent plate openings 230.

[0079] In some embodiments, the size and shape of the plate opening or hole 230 are configured to allow more than one cutting edge 214a, 214b to pass through the plate 218. In a preferred embodiment, the plate 218 allows only one of the cutting edges 214a or 214b to pass through, so as to allow the force-applying element 216 to be attached to the plate 218. For example, allowing both cutting edges 214a and 214b, which both span half of the plate 218, to pass through the plate 218 would result in a hole at point 231 along the central axis 205, at which point the force-applying element 216 is attached to the plate 218. Therefore, in order to allow the force-applying element 216 to be attached to the plate 218 at point 231, the plate 218 includes only one plate opening 230 configured to allow one of the cutting edges 214a or 214b to pass through the plate 218. However, plate 218 may include a plurality of plate openings 230 configured to allow a plurality of cutting blades to be arranged through the plate, while still maintaining points 231 for attaching force-applying elements 216 to plate 218.

[0080] In some embodiments, the length of cutting edge 214a is greater than that of cutting edge 214b to allow cutting edge 214a to extend through the plate opening 230 of plate 218. For example, the length of cutting edge 214b may be between approximately 2 mm and approximately 5 mm, and the length of cutting edge 214a may be between approximately 4 mm and approximately 10 mm. The size and shape of the plate opening 230 may be configured to allow either cutting edge 214a or 214b to pass through. For example, the shape of the plate opening 230 may be semi-circular. However, the plate opening 230 may be rectangular, triangular, elliptical, or any other desired shape. In some embodiments, the plate opening 230 is arranged off-center from the central axis 205 on plate 218. In some embodiments, the plate opening 230 extends less than 360° around plate 218. For example, the plate opening 230 may extend around the plate 218 between 10° and 345°, 45° and 300°, 90° and 270°, 120° and 225°, or 180° and 200°. In some embodiments, the plate opening 230 extends around the plate 218 between 30° and 330°. The plate opening 230 may have a length sized and shaped to receive one of the cutting blades 214a or 214b. In some embodiments, the length of the plate 218 is between approximately 0.01 mm and 0.05 mm.

[0081] Reference Figure 7A and Figure 7B The diagram shows a cross-sectional view of the endoscopic surgical tool 200. Figure 7A It shows along Figure 5 A cross-sectional view of plate 218 taken along axis AA. Figure 7B It shows along Figure 5A cross-sectional view of plate 218 taken along the BB axis. The AA axis is adjacent to opening 219 and distal end 222, and the BB axis is adjacent to point 231 and proximal end 220. At point 231 and proximal end 220, force-applying element 216 is connected to plate 218. At the AA axis, both cutting edges 214a and 214b are present. However, at the BB axis and adjacent point 231, cutting edge 214b is no longer present to allow force-applying element 216 to connect to point 231. If both cutting edges 214a and 214b passed through plate opening 230, they would form a hole at point 231 because they form a column around rod 212. This would prevent force-applying element 216 from connecting to plate 218 at point 231.

[0082] Reference Figure 8 The endoscopic surgical tool 200 may include a wire that supplies current to the blade 204. Figure 8 In one embodiment shown, the endoscopic surgical tool 200 may include a single operating line 234. The operating line 234 may be soldered to a cutting edge 214a via solder points 232. The operating line 234 may be configured to supply current from a power source (not shown) through the cutting edge 214a to the cutting edge 214b to allow current to flow through the blade 204, enabling the blade 204 to cut and cauterize tissue. In some embodiments, a cutting facet 207 is connected to the distal end of the operating line 234. The operating line 234 may be configured to supply current to the blade 204 regardless of whether the endoscopic surgical tool 200 is in a needle-blade configuration or a blade configuration with an insulator at the end.

[0083] In some implementations, such as Figure 9 As shown, the endoscopic surgical tool 200 may include more than one operating line. For example, the endoscopic surgical tool 200 may include operating lines 236 and 238. Operating line 236 may be coupled to a cutting edge 214a to supply current from a power source (not shown) through the cutting edge 214a to the cutting surface 207. Furthermore, operating line 238 may be coupled to a plate 218 and may be configured to supply current to one or more of the cutting surface 207 and the distal portion 211 via, for example, a force-applying element 216. However, the endoscopic surgical tool 200 may include as many operating lines as desired. For example, the endoscopic surgical tool 200 may include three, four, five, six, seven, eight, or more than eight operating lines.

[0084] Reference Figure 3 as well as Figures 10A to 13BThe endoscopic surgical instrument 200 may include a second insulator 240. The second insulator 240 may include an inner surface 240a and an outer surface 240b, and may have a proximal end 240c and a distal end 240d. The proximal end 240c of the second insulator 240 may be inside the housing 202. The distal end 240d of the second insulator 240 may be adjacent to or flush with the distal end 222 of the housing 202. The inner surface 240a of the second insulator 240 may have a cross-section with a smaller diameter at the distal end 240d than at the proximal end 240c.

[0085] The endoscopic surgical tool 200 may also include a connecting element 242 and one or more protrusions 244. The connecting element 242 may surround the force-applying element 216 and may be inserted into the inner surface 240a of the second insulator 240.

[0086] Figures 10A to 13B The configuration allows switching between the aforementioned needle-like knife configuration (“knife state”) and the configuration of the knife 204 with an insulator 210 at the end 206 (“insulator state”) by moving the operating line 234 forward and backward. Figure 10A The knife state is shown, in which the operating line 234 is fully retracted and the force-applying element 216 is in a balanced state. Figure 10B The “intermediate state” between the knife state and the insulator state is shown. Figure 10C The insulator state at the end is shown. Figure 10C In the insulated state shown, the operating line 234 is fully extended and the force-applying element 216 is in a compressed state.

[0087] exist Figure 10A as well as Figures 11A to 11B In the example knife configuration shown, the treatment tool 200 can be used in the needle-like knife structure. An insulator 210 can be connected to the distal end of the cutting surface 207. The proximal end of the cutting surface 207 can be connected to the proximal end of the connecting element 242. The connecting element 242 can be connected to the operating line 234. The circumferential surface of the connecting element 242 may include one or more elongated openings 242a corresponding to one or more protrusions 244. The interior of the connecting element 242 can accommodate a force-applying element 216. The proximal end of the force-applying element 216 can be connected to the interior of the connecting element 244.

[0088] exist Figure 10B and 12A to Figure 12B In the intermediate state shown in the example, the operating line 234 can be partially advanced / retracted. The force-applying element 216 can be in a balanced state. One or more protrusions 244 can contact the proximal end 240c of the second insulator 240. The insulator 210 can be separated from the distal end 240d of the second insulator 240. Figure 10B as well as Figures 12A to 12BThe example shows that the operating line 234 can advance until one or more protrusions 244 contact the proximal end 240c of the second insulator 240. The diameter of the proximal end of the through-hole in the second insulator 240 (e.g., the diameter of the inner surface 240a adjacent to the proximal end 240c of the second insulator 240) can be smaller than one or more protrusions 244, thus providing an upper internal barrier 240e. Therefore, as the operating line 234 advances, after one or more protrusions 244 contact the proximal end 240c of the second insulator 240, one or more protrusions 244 may not advance further. Therefore, the blade 204 may not advance further. However, by moving one or more protrusions 244 through the opening 242a provided in the connecting element 242, the connecting element 242 can advance further.

[0089] If the operation line 234 is from Figure 10B as well as Figures 12A to 12B The intermediate state shown moves forward. An insulator state can be achieved, such as... Figure 10C as well as Figures 13A to 13B As shown in the example, when the operating line 234 advances, the connecting element can advance until the distal end of the connecting element 242 contacts the narrowing portion of the inner surface 240a of the second insulator 240 near the distal end 240d of the second insulator 240 at the upper inner barrier 240e. The contact at the upper inner barrier 240e prevents the connecting element 242 from being pushed out of the distal end 240d of the second insulator 240, while the cutting blade 207 and the insulator 210 can continue to advance. As the connecting element 242 advances, the cutting blade 207 and the insulator can also advance until the force-applying element 216 is compressed. Therefore, the insulator 210 can advance further than the blade 204. Therefore, the end 206 can be enclosed within the groove 224 by the insulator 210 and laterally surrounded. Figure 10C as well as Figures 13A to 13B In the insulating state shown, the treatment tool 200 can be used as a knife 204 with an insulator 210 at the end 206.

[0090] Disposal tool 200 can be reversed Figures 10A to 13B The operation shown changes the device from an insulating state to a cutting state. The reverse operation can be achieved by retracting the operating line 234 at least until it reaches its equilibrium length. Therefore, the disposal tool 200 can move from an insulating state to an intermediate state, and then to the cutting state.

[0091] Those skilled in the art will understand that changes can be made to the exemplary embodiments shown and described above without departing from their broad inventive conception. Therefore, it should be understood that the invention is not limited to the exemplary embodiments shown and described, but is intended to cover variations within the spirit and scope of the invention as defined by the claims. For example, specific features of exemplary embodiments may or may not be part of the claimed invention, and various features of the disclosed embodiments may be combined. The terms “near,” “far,” “upper,” and “lower” indicate directions in the referenced figures. Unless specifically stated herein, the terms “a” and “the” are not limited to a single element but should be understood as “at least one.”

[0092] It should be understood that at least some of the drawings and descriptions of this invention have been simplified to focus on elements relevant to a clear understanding of the invention, while other elements that may also form part of this invention and would be understood by one of ordinary skill in the art have been omitted for clarity. However, because these elements are well known in the art, and because they do not necessarily contribute to a better understanding of the invention, a description of these elements is not provided herein.

Claims

1. An endoscopic surgical tool comprising: A housing having a first hole extending along the longitudinal axis of the housing; A knife having a tube, wherein the knife extends through the first hole and a portion of the tube is configured to protrude from the housing; A rod arranged inside the tube, wherein the rod is configured to move relative to the tube along the longitudinal axis of the housing; A line extending along the longitudinal axis of the housing, wherein the line has a distal end and a proximal end; and A connector that connects the distal end of the wire to the tube.

2. The endoscopic surgical tool according to claim 1 further includes a spring. The spring extends along the longitudinal axis of the housing and is located between the distal end of the rod and the line.

3. The endoscopic surgical tool according to claim 1 further includes a spring. The spring extends along the longitudinal axis of the housing and is located between the distal end of the rod and the connector.

4. The endoscopic surgical tool of claim 1, wherein the blade has an insulator connected to the tube.

5. The endoscopic surgical instrument of claim 4, wherein the rod has an enlarged end at the distal end of the rod, and the tube is configured such that a portion protruding from the housing extends from the distal end of the housing toward the enlarged end.

6. The endoscopic surgical instrument of claim 1, wherein the rod has an enlarged end at the distal end of the rod.

7. The endoscopic surgical instrument of claim 6, wherein the tube has a distal end connected to the insulator, and the distal end of the tube is disposed between the enlarged end and the cut surface of the tube.

8. The endoscopic surgical tool of claim 1, wherein at least a portion of the connector is formed in a tubular shape and the spring is located inside the connector.

9. The endoscopic surgical tool of claim 1, wherein the blade is an electrode.

10. The endoscopic surgical tool of claim 5, wherein the insulator has a first cavity and the enlarged end is movable in the longitudinal direction of the blade within the first cavity.

11. The endoscopic surgical instrument of claim 1, wherein the blade has an insulator connected to the tube. The rod has an enlarged end at its distal end, and When the enlarged end comes into contact with the distal end of the tube, the outer peripheral surface of the enlarged end is covered by the insulator.

12. An endoscopic surgical tool comprising: A housing having a first hole extending along the longitudinal axis of the housing; A knife having a tube, wherein the knife extends through the first hole and at least a portion of the tube is configured to protrude from the housing; A rod arranged inside the tube, wherein the rod is configured to move relative to the tube along the longitudinal axis of the housing; A line extending along the longitudinal axis of the housing, wherein the line has a distal end and a proximal end; A connector that connects the distal end of the wire to the tube; and A spring is arranged between the proximal end of the rod and the line, wherein the spring extends along the longitudinal axis of the housing.

13. The endoscopic surgical tool of claim 12, wherein the blade has an insulator connected to the tube.

14. The endoscopic surgical instrument of claim 13, wherein the rod has an enlarged end at the distal end of the rod, and the tube is configured such that a portion protruding from the housing extends from the distal end of the housing toward the enlarged end.

15. The endoscopic surgical instrument of claim 14, wherein the insulator includes a groove at the distal end of the insulator, and the groove is sized and shaped to receive the enlarged end.

16. The endoscopic surgical instrument of claim 12, wherein the rod has an enlarged end at the distal end of the rod.

17. The endoscopic surgical instrument of claim 16, wherein the blade has an insulator coupled to the tube, the tube having a distal end connected to the insulator, and the distal end of the tube being disposed between the enlarged end and the cutting surface of the tube.

18. The endoscopic surgical tool of claim 12, wherein at least a portion of the connector is formed in a tubular shape, and the spring is located inside the connector.

19. The endoscopic surgical tool of claim 12, wherein the blade is an electrode.

20. An endoscopic surgical tool comprising: A housing having a first hole extending along the longitudinal axis of the housing; A knife having a tube, wherein the knife extends through the first hole and at least a portion of the tube is configured to protrude from the housing; A rod arranged inside the tube, wherein the rod is configured to move relative to the tube along the longitudinal axis of the housing; A line extending along the longitudinal axis of the housing, wherein the line has a distal end and a proximal end; An actuator, which is coupled to the housing, wherein the actuator is configured to control the extension of the blade; and spring, The spring extends along the longitudinal axis of the housing, and The spring is located between the proximal end of the actuator and the proximal end of the rod.

Images