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CN-122005062-A - Double-electrode mucosal endoscope incision knife

CN122005062ACN 122005062 ACN122005062 ACN 122005062ACN-122005062-A

Abstract

The invention discloses a double-electrode endoscopic mucosal cutting knife which comprises a wire, a handle made of insulating materials, a connecting part and a knife head assembly, wherein the knife head assembly comprises a head sleeve, a knife arm symmetrically hinged to the head sleeve, and an elastic expansion mechanism for connecting the head sleeve and the knife arm, and a pull rope penetrates through the connecting part and is connected with a sliding control part of the handle and the knife arm. When the knife arm knife edge clamps tissues, the wires form a local current loop, and the wires reserve the length allowance for adapting to the bending of the connecting part and the movement of the knife arm. The invention solves the problems that the current of the existing monopolar incision is conducted through a human body, the tissue is easy to be injured by mistake, and the electrocoagulation electrosurgery postsyndrome is caused, improves the cutting accuracy and the use safety, and ensures the loop stability.

Inventors

  • WANG YUNDONG
  • ZHANG JUNXIU
  • WANG WEI
  • HE CHIYI

Assignees

  • 皖南医学院第一附属医院（皖南医学院弋矶山医院）

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The utility model provides a bi-electrode mucosal endoscope cutting knife which characterized in that, including wire (100) that are used for electrically conducting and by insulating material make and handle (200), connecting portion and tool bit subassembly (300) that connect gradually, be provided with the slip control on handle (200), tool bit subassembly (300) include: a head sleeve (310) as a support structure, a first end of which is connected to the connection portion; A cutter arm (320) having a pair and symmetrically disposed about the head sleeve (310), hinged to the head sleeve (310) by a hinge (330), and extending from a second end of the head sleeve (310); an elastic expansion mechanism connecting the head sleeve (310) and the cutter arm (320) and capable of expanding the cutter arm (320) outwards; The pull rope (340) is arranged on the connecting part in a penetrating way, two ends of the pull rope are respectively connected with the sliding control piece and the cutter arm (320), and the sliding control piece can be converted into the folding movement of the cutter arm (320) when being far away from the connecting part; The wire (100) is provided with a pair, first ends of the wire (100) are respectively connected with the knife edges of a pair of knife arms (320), second ends of the wire (100) are connected to the handle (200) and can be connected with an external circuit, when the knife edges of the knife arms (320) clamp tissue organs, the second ends of the wire (100) form a current loop at a clamping position, and the wire (100) is provided with a length allowance which is suitable for bending deformation of the connecting part and movement of the knife arms (320).
  2. 2. The dual electrode endomucosal resection blade according to claim 1, wherein the head cannula (310) is provided with a first stop (312) at a first end and a second stop (313) at a second end; a mounting plate (311) is movably arranged in the head sleeve (310) along the axis direction of the head sleeve, and one end of the pull rope (340) is connected with the mounting plate (311); The cutter arm (320) is hinged to the mounting plate (311) through a hinge (330), and the head part of the cutter arm extends out of the head sleeve (310) from the opening on the second limiting piece (313), the mounting plate (311) can drive the cutter arm (320) to retract inwards or extend outwards in the opposite direction of the connecting part, the opening on the second limiting piece (313) and the cutter arm (320) are provided with inclined planes (314) in an adapting way, and the inclined planes (314) can enable the cutter arm (320) to retract inwards when the cutter arm (320) contracts inwards along with the mounting plate (311); Openings for avoiding the lead wires (100) are formed in the mounting plate (311) and the first limiting piece (312); The elastic expansion mechanism comprises a first axial telescopic elastic piece (331) connected with the first limiting piece (312) and the mounting plate (311), and a torsion elastic piece which is located on the hinge piece (330) and connected with the mounting plate (311) and the cutter arm (320), wherein the first axial telescopic elastic piece (331) can enable the mounting plate (311) to drive the cutter arm (320) to extend outwards, and the torsion elastic piece can enable the cutter arm (320) to expand outwards.
  3. 3. The dual electrode endomucosal resection blade according to claim 2, further comprising a water injection assembly capable of extending water injection from a gap of the blade arm (320) in an expanded state of the blade arm (320), the water injection assembly comprising: The movable disc (360) is axially and movably arranged in the head sleeve (310) and is arranged between the first limiting piece (312) and the mounting plate (311), and is provided with a starting point position close to the second limiting piece (313), a final point position close to the first limiting piece (312) and a middle position between the starting point position and the final point position, and the end part connected with the pull rope (340) is fixedly connected with the movable disc (360); The water injection pipe (350) is penetrated through the connecting part, the water outlet end (351) of the water injection pipe is arranged on the movable disc (360), the water inlet end (352) of the water injection pipe is positioned on the handle (200) and is provided with a length allowance which is matched with the bending deformation of the connecting part and moves along with the axial direction of the movable disc (360), and the mounting plate (311) and the first limiting piece (312) are also provided with openings for avoiding the water injection pipe (350); a second axial telescopic elastic member (370) connecting the movable disc (360) with the mounting plate (311); Wherein the elastic relationships of the first axial expansion elastic piece (331), the second axial expansion elastic piece (370) and the torsion elastic piece are configured as follows: When the movable disc (360) is at the starting point, the cutter arm (320) is in an expanded state, the water outlet end (351) of the water injection pipe (350) extends forwards relative to the cutter arm (320), and the resultant force direction of the first axial telescopic elastic piece (331) and the second axial telescopic elastic piece (370) points to the cutter arm (320); when the movable disc (360) is in the middle position, the water injection pipe (350) is contracted inwards to the head sleeve (310) to avoid the cutter arm (320), and the cutter arm (320) is at a critical point for transition from an expanded state to a furled state; the movable disk (360) is moved from the middle position to the end position, and the cutter arm (320) is folded inwards and can clamp a tissue organ.
  4. 4. A dual electrode mucosal endoscope cutting knife according to claim 3, wherein said first axial telescopic elastic member (331) and said second axial telescopic elastic member (370) are respectively a first axial spring and a second axial spring, said torsion elastic member is a torsion spring, the spring coefficient of said first axial spring is k1, the spring coefficient of said second axial spring is k2, the spring coefficient of said torsion spring is k3, wherein k1> k2> k3; when the movable disc (360) is at the starting point, the second axial spring is in a compressed state, and the torsion force of the torsion spring enables the cutter arm (320) to be abutted against the end part of the second limiting piece (313), so that an axial component force for limiting the axial displacement of the mounting plate (311) is generated; When the movable disk (360) is in the middle position, the first axial spring is in a compressed state, and the second axial spring is at a critical point of transition from the compressed state to the stretched state; When the movable disc (360) moves from the middle position to the end point, the second axial spring continues to stretch until the axial force component generated by the torsion spring is greater than the pulling force of the mounting plate (311), and then the mounting plate (311) starts to move axially, and the cutter arm (320) is driven to retract under the action of the inclined surface (314).
  5. 5. A dual electrode mucosal endoscope cutting knife according to claim 3, wherein a guide rail (380) is provided on the inner wall of said head sleeve (310) along the axial direction, and notches adapted to said guide rail (380) are provided on said mounting plate (311) and said movable plate (360) for achieving a sliding fit along the axial direction of said head sleeve (310).
  6. 6. The double-electrode endomucosal resection knife according to claim 3, wherein the sliding control member comprises a sliding block (210) capable of sliding on the handle (200), one end of the pull rope (340) is fixedly connected with the sliding block (210), the sliding block (210) slides between a proximal point close to the connecting part and a distal point far away from the connecting part, an intermediate point is passed through in sliding, a limiting structure (220) capable of selectively limiting the sliding block (210) between the distal point and the intermediate point is further arranged on the handle (200), and the proximal point, the intermediate point and the distal point respectively correspond to a starting point, an intermediate point and an end point of the movable disc (360) one by one in sequence.
  7. 7. The dual-electrode endomucosal resection knife according to claim 6, wherein the limit structure (220) comprises a sliding groove (221) formed on the sliding block (210) along a sliding direction, a limit block (223) penetrating through the sliding groove (221) is arranged on the handle (200), the first end and the second end of the limit block (223) are abutted against the proximal end point and the distal end point of the sliding block (210) respectively, a mounting opening (222) is formed on the sliding groove (221) along a direction perpendicular to the sliding direction of the sliding block (210), a plug connector (224) is detachably mounted at the mounting opening (222), and when the plug connector (224) is plugged into the sliding groove (221), the limit block (223) is arranged between the plug connector (224) and the second end of the sliding groove (221).
  8. 8. The dual electrode endomucosal cutting knife according to claim 7, wherein said plug (224) is provided with a pull ring (225).
  9. 9. The dual electrode endomucosal resection blade according to claim 1, wherein the maximum expansion angle of the blade arm (320) is configured between 25 ° and 35 °.
  10. 10. The bi-electrode endomucosal resection knife according to claim 1, wherein the handle (200), the connection portion and the blade assembly (300) are all made of medical grade insulating polymer material.

Description

Double-electrode mucosal endoscope incision knife Technical Field The invention relates to the technical field of medical instruments, in particular to a double-electrode mucosal endoscope cutting knife. Background Endoscopic Submucosal Dissection (ESD) is a conventional surgical method for diseases such as early tumor of digestive tract, submucosal tumor, etc., and the performance of the submucosal dissection is directly affected by the safety and efficiency of the operation as a core instrument of the technology. The current mucous membrane incision sword that clinical wide use all is monopole mucous membrane incision sword, and its structural feature is that one end electrode connection tool bit, and the other end is pasted in patient's abdominal wall through the viscidity electrode slice, and the electric current forms the electric circuit through human conduction after the circular telegram, utilizes the thermal effect between tool bit and the tissue to realize cutting, and the integrated water injection function of partial monopole incision sword is in order to shorten operation time. The existing monopole mucous membrane incision knife has obvious defects that current is conducted through a human body, a thermal effect is easy to generate in a non-target area, normal tissues around accidental injury are caused, perforation is induced, meanwhile, the conduction mode is easy to cause postoperative electrocoagulation and electrotome syndrome to influence recovery of a patient, and potential safety hazards caused by a monopole structure are not solved even if a water injection function is integrated, so that suitability and safety are required to be improved. Therefore, a mucous membrane incision knife which can avoid current conduction through a human body, reduce tissue injury, reduce postoperative complications and achieve operation convenience is needed clinically, so that the core short plate in the prior art is solved. Disclosure of Invention The invention aims to provide a double-electrode mucosal endoscope incision knife, which aims to solve the technical problems that in the prior art, monopolar mucosal incision knife current is conducted through a human body, surrounding tissues are easy to injure by mistake, and postoperative electrocoagulation electric incision syndrome exists. In order to solve the technical problems, the invention specifically provides the following technical scheme: The invention provides a double-electrode endoscopic incision knife which comprises a conducting wire, a handle, a connecting part and a knife head assembly, wherein the handle is made of insulating materials and sequentially connected, a sliding control piece is arranged on the handle, the knife head assembly comprises a head sleeve, a knife arm, an elastic expansion mechanism, a pull rope and a clamping mechanism, the head sleeve is used for conducting wires, the handle is made of insulating materials and sequentially connected, the first end of the head sleeve is connected with the connecting part, the knife arm is provided with a pair of knife arms, the pair of knife arms are symmetrically arranged relative to the head sleeve, are hinged to the head sleeve through a hinge piece and extend out of the second end of the head sleeve, the elastic expansion mechanism is connected with the head sleeve and the knife arms, the knife arms can be expanded outwards, the pull rope penetrates through the connecting part and is connected with the sliding control piece and the knife arms at two ends respectively, sliding of the sliding control piece far away from the connecting part can be converted into folding motion of the knife arms, the first ends of the wires are respectively connected with the knife edges of the pair of the knife arms, the second ends of the wires are connected with the handle and can be connected with an external circuit, the second ends of the wires can be connected with the handle, and the second ends of the knife arms can be connected with the external circuit, and the current can form a deformed loop, and the clamp part can move when the knife arms are bent, and the knife arms are connected with the second ends, and the knife arms have a tissue. According to one embodiment of the invention, a first limiting piece is arranged at a first end of the head sleeve, a second limiting piece is arranged at a second end of the head sleeve, a mounting plate is movably arranged in the head sleeve along the axis direction of the head sleeve, one end of the pull rope is connected with the mounting plate, the cutter arm is hinged to the mounting plate through a hinge piece, the head extends out of the head sleeve from an opening on the second limiting piece, the mounting plate can drive the cutter arm to retract inwards or extend outwards in the connecting part direction, inclined planes are formed in the opening on the second limiting piece and the cutter arm in an adapting mode, the inclined planes can enab