CN112438795B

CN112438795B - Novel medical electrotome and tool bit assembly thereof

Info

Publication number: CN112438795B
Application number: CN202011129625.XA
Authority: CN
Inventors: 周平红; 蔡明琰; 葛泉波; 寇鹏
Original assignee: Leo Medical Co ltd
Current assignee: Leo Medical Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2022-05-20
Anticipated expiration: 2040-10-21
Also published as: CN114081615B; CN114081615A; CN112438795A

Abstract

The invention provides a novel medical electric knife and a knife head component thereof, wherein the knife head component comprises a snare loop and a cutting knife, the cutting knife comprises a knife handle fixedly connected with the distal end of the snare loop and a knife head fixedly connected with the distal end of the knife handle, two symmetrically arranged grooves which extend along the length direction of the knife handle are arranged on the surface of the knife handle, a through hole penetrating through the knife handle is also arranged in the knife handle, two ends of the through hole are respectively communicated with the two grooves, the distal end of the snare loop is penetrated in the through hole, the snare loop part positioned on two sides of the through hole is limited in the groove, and the distal end of the snare loop is embedded and fixed with the knife handle. For inlaying the mechanical fixation who establishes the formula between the snare loop and the cutting knife in this application, the distal end of the snare loop is worn to establish in the handle of a knife of cutting knife and is inlayed and locate the handle of a knife, and this fixed connection stable in structure is reliable and stable, effectively avoids the cutting knife to drop from the distal end accident of snare loop to improve the security of operation.

Description

Novel medical electrotome and tool bit assembly thereof

Technical Field

The invention relates to the field of medical instruments, in particular to a novel medical electrotome and a cutter head component thereof.

Background

Endoscopic Submucosal Dissection (ESD) is a new treatment means in recent years, and is also a technology with good clinical application prospect, so that more early digestive tract cancers can be completely excised at one time under an endoscope, and the pain of an open surgery and the excision of organs are avoided. Compared with Endoscopic treatment methods such as laparotomy and EMR (Endoscopic Mucosal resection), the ESD has the advantages that the trauma is small, a patient can receive multiple treatments at multiple parts, a doctor can obtain a complete histopathological specimen for analysis, the resection rate of tumors with large areas and irregular forms or combined ulcers and scars is more than 96%, the recurrence probability is reduced, and the like.

The conventional ESD operation process needs operations such as cutting range marking, injection uplifting, mucosa cutting and peeling, hemostasis and the like, and various types of instruments such as Dull Knife, IT Knife, Hook Knife, injection needles, hemostatic clamps, thermal biopsy forceps and the like are needed in the operation process, so that the total cost is high; in addition, various instruments need to be frequently replaced in the operation process, and the operation time is long.

At present, the Chinese patent with application number 201510506373.0 discloses a medical electric excision and coagulation device, and the Chinese patent with application number 201610423834.2 discloses a rotary electric excision and coagulation device, wherein the two medical instruments can partially replace each instrument in the ESD operation process to carry out the operations of excision range marking, mucosa incision stripping and hemostasis, but the operation of injection bulge cannot be carried out, so the operation of injection bulge still needs to be carried out by exchanging instruments such as injection needles and the like in the ESD operation process. In addition, in the two prior arts, the gap between the traction rope and the outer sheath tube is large, which easily causes the defect that the extension of the snare loop head end is unstable, and when the marginal electrocoagulation technology is implemented, misoperation is easily caused.

Further, some medical electrotomes among the prior art can set up the cutting knife at the distal end of snare ring, and cutting knife and snare ring are fixed through crimping or welded mode, but, this kind of fixed connection mode is not very reliable, in case the accident that appears the cutting knife in the operation in-process drops, will cause more serious bad consequence.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a novel cutter head component of a medical electric knife, which realizes the reliable fixed connection between a cutting knife and a snare loop and effectively avoids the accidental falling of the cutting knife.

In order to achieve the purpose, the invention provides a novel knife head assembly of a medical electric knife, which comprises a ring sleeve ring and a cutting knife, wherein the cutting knife comprises a knife handle fixedly connected with the distal end of the ring sleeve ring and a knife head fixedly connected with the distal end of the knife handle, two symmetrically arranged grooves extending along the length direction of the knife handle are formed in the surface of the knife handle, a through hole penetrating through the knife handle is further formed in the knife handle, two ends of the through hole are respectively communicated with the two grooves, the distal end of the ring sleeve ring is arranged in the through hole in a penetrating manner, the ring sleeve ring part positioned on two sides of the through hole is limited in the groove, and the distal end of the ring sleeve ring is fixedly embedded with the knife handle.

Further, the distal end of the ring of circling the ring is equipped with the ring connecting portion of stereotyping for the U-shaped integratively, ring connecting portion is including consecutive first section of bending, second section of bending and the third section of bending, the second section of bending is worn to establish in the through hole, first section of bending and the third section of bending holding respectively in two recesses.

Furthermore, the snare loop is formed by a plurality of strands of braided wires made of stainless steel, or a plurality of strands of braided wires made of nickel titanium, or a plurality of strands of braided wires made of a plurality of materials of stainless steel and nickel titanium after being compounded, or a monofilament made of stainless steel, or a monofilament made of nickel titanium.

Furthermore, the ring sleeve ring and the knife handle are welded or bonded.

Further, the cutting knife is an integrated piece.

Further, the cutter head is of a mushroom head type, a triangular or door nail type, an L type or a linear type.

The application still provides a novel medical electrotome, including outer sheath pipe, movably wear to establish at the intraductal haulage rope of outer sheath, be used for driving the handle components that the haulage rope removed and as above the tool bit subassembly, the near-end of the snare loop links to each other with the distal end stationary phase of haulage rope.

Further, the handle assembly comprises a handle seat fixed at the proximal end of the outer sheath tube and an operating handle in sliding fit with the handle seat along the extension direction of the outer sheath tube; the novel medical electric knife also comprises a catheter which is movably arranged in the handle seat in a penetrating way and is fixed with the near end of the traction rope, a protection tube fixed at the far end of the sheath tube and an electric coagulation electrode fixed in the sheath tube; the handle seat is provided with a gas-liquid joint, a gas-liquid channel is arranged in the handle seat, the gas-liquid joint is used for being connected with a gas source or a liquid source, and the gas-liquid channel, the inner cavity of the outer sheath tube and the inner cavity of the protection tube are sequentially communicated; the operating handle is provided with an electrified joint connected with the catheter, the electrified joint is used for being connected with a power supply, and the catheter, the traction rope and the snare loop can conduct electricity; the electrocoagulation electrode is arranged at the distal section of the outer sheath tube and close to the proximal end of the protection tube, and the ring can be in contact fit with the electrocoagulation electrode when the ring is furled in the outer sheath tube.

Furthermore, novel medical electrotome is still including setting up the connecting pipe in outer sheath pipe inside, the connecting pipe sets up between snare loop and haulage rope, the distal end and the near-end of connecting pipe are fixed continuous with the near-end of snare loop and the distal end of haulage rope respectively.

Further, novel medical electrotome is still including setting up at the intraductal and the star venturi tube of cover on the haulage rope of sheath and the butt just all fixes the spacing pipe on the haulage rope at star venturi tube both ends, be provided with the sand grip on the outer peripheral face of star venturi tube, the maximum external diameter of star venturi tube is less than the internal diameter of sheath pipe.

Further, the protection tube comprises a hollow cylindrical section extending into the outer sheath tube and a hollow conical section integrally extending from the far end of the hollow cylindrical section and located outside the outer sheath tube, the protection tube has a maximum outer diameter at the near end of the hollow conical section, the maximum outer diameter is the same as the outer diameter of the outer sheath tube, and a bulge tightly matched with the inner wall of the outer sheath tube is arranged on the outer surface of the hollow cylindrical section.

Furthermore, the handle seat is provided with an electrifying cavity channel for accommodating part of the guide pipe at the position of the electrifying joint, a sealing device for isolating the electrifying cavity channel and the gas-liquid cavity channel is fixedly arranged in the handle seat, and the guide pipe can be movably arranged in the sealing device in a penetrating way.

Further, the handle assembly further comprises a locking assembly; the operating handle is provided with a through hole which is vertical to the sliding direction of the operating handle; the handle seat is provided with an open slot extending along the sliding direction of the operating handle; the locking assembly comprises a rotating rod penetrating through the through hole, the end part of the rotating rod is positioned in the open slot, the end part of the rotating rod is provided with two opposite planar long side surfaces, and the length of each long side surface is greater than that of the other side surfaces; when the other side surfaces of the rotating rod are consistent with the width direction of the opening of the open slot, the operating handle can axially move relative to the handle seat; it is rotatory the rotary rod makes when the long side of rotary rod is unanimous with the opening width direction of open slot, the rotary rod will enlarge the aperture of open slot, makes the outer wall of handle seat supports tightly with operating handle's via hole wall, will handle seat and operating handle locking.

As described above, the novel medical electric knife and the knife head assembly thereof according to the present invention have the following advantages:

for inlaying the mechanical fixation who establishes the formula between the snare loop and the cutting knife in this application, the distal end of the snare loop is worn to establish in the handle of a knife of cutting knife and is inlayed and locate the handle of a knife, and this fixed connection stable in structure is reliable, effectively avoids the cutting knife to drop from the distal end accident of snare loop to improve the security of operation.

Drawings

Fig. 1 is a schematic structural diagram of the novel medical electrotome in the present application.

Fig. 2 is a view of the state of the novel medical electrotome of the present application at its distal end during an electrocoagulation operation.

Fig. 3 is a diagram of the state of the novel medical electric knife at the distal end of the medical electric knife when the novel medical electric knife is used for performing the electric incisional and electrocoagulation operations.

FIG. 4 is a schematic diagram of the construction of an electrocoagulation electrode of the present application.

Fig. 5a to 5d are schematic structural views of four embodiments of the protective tube in the present application, which are cross-sectional views.

Fig. 6a to 6b are schematic structural views of two embodiments of star-shaped tubes in the present application, which are side views.

Fig. 7 is a partial structure schematic diagram of the novel medical electric knife at the handle seat.

Fig. 8 is a schematic structural diagram of a cutter head assembly in the present application.

Fig. 9 to 11 are schematic structural views of the cutting knife in different view angles in the present application.

Fig. 12a to 12f are schematic views of four embodiments of a cutting blade of the cutting burr of the present application, wherein fig. 12f is a distal end side view of fig. 12 e.

FIG. 13 is a schematic view of the structure of the handle assembly of the present application.

Fig. 14 is a schematic structural view of a rotary rod in the present application.

Fig. 15 is a schematic structural diagram of a rotary block in the present application.

Fig. 16 is a partial structural view of the operating handle in the present application.

Fig. 17 is a schematic view of the engagement between the rotary rod and the opening groove of the handle seat.

Fig. 18 is a diagram illustrating a state in which the rotary lever and the operation handle are relatively movable in the present application.

Fig. 19 is a cross-sectional view of fig. 18.

Fig. 20 is a view showing a state in which the rotary lever is locked relative to the operating handle in the present application.

Fig. 21 is a cross-sectional view of fig. 20.

Description of the element reference numerals

1. The electric coagulation instrument comprises a ring-shaped ring, 101, a ring connecting part, 102, a first bending section, 103, a second bending section, 104, a third bending section, 2, a connecting pipe, 3, a protection pipe, 301, a hollow cylindrical section, 302, a hollow conical section, 303, a bulge, 4, an outer sheath pipe, 5, an electric coagulation electrode, 501, a spiral spring pipe, 502, a pin, 6, a traction rope, 7, a handle seat, 701, a gas-liquid cavity channel, 702, an electric cavity channel, 8, a sealing device, 9, a guide pipe, 10, a gas-liquid connector, 11, an electric connector, 12, an operating handle, 13, a high-frequency power supply, 14, an air storage tank, 15, an injector, 16, a cutting knife, 161, a knife handle, 162, a knife head, 163, a groove, 164, a knife connecting part, 165, a through hole, 17, a limiting pipe, 18, a star-shaped pipe, 181, a convex strip, 19, a pressing block, 20, a rotating rod and 21 rotating blocks.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be made without substantial technical changes and modifications.

The application provides a medical instrument, in particular to a novel medical electrotome used for cutting off or peeling off alimentary canal, respiratory polyp or tumor mucosa and a cutter head component of the novel medical electrotome. In order to more clearly describe the structure of the present application, the following embodiments use the terms "distal end" and "proximal end" as directional terms, the "distal end" refers to the end of the instrument away from the operator during the operation, and the "proximal end" refers to the end of the instrument close to the operator during the operation.

As shown in fig. 8, the knife head component of the novel medical electric knife comprises a ring collar 1 and a cutting knife 16; as shown in fig. 9 to 11, the cutting knife 16 includes a knife handle 161 fixedly connected to the distal end of the collar 1, and a knife head 162 fixedly connected to the distal end of the knife handle 161, two symmetrically arranged grooves 163 extending along the length direction of the knife handle 161 are formed on the surface of the knife handle 161, a through hole 165 penetrating through the knife handle 161 is further formed in the knife handle 161, and two ends of the through hole 165 are respectively communicated with the two grooves 163; the far end of the snare loop 1 penetrates through the through hole 165, and the snare loop 1 part positioned on two sides of the through hole 165 is limited in the groove 163, so that the far end of the snare loop 1 is embedded and fixed with the knife handle 161.

As shown in figure 1, the novel medical electric knife comprises a hollow outer sheath tube 4, a traction rope 6 movably arranged in the outer sheath tube 4 in a penetrating mode, a handle component used for driving the traction rope 6 to move, and the knife head component, wherein the near end of a snare loop 1 in the knife head component is fixedly connected with the far end of the traction rope 6. When the handle component drives the traction rope 6 to move back and forth in the outer sheath tube 4, the traction rope 6 drives the cutter head component to move back and forth together, so that the snare loop 1 and the cutting knife 16 extend out of the outer sheath tube 4, and the snare loop 1 and the cutting knife 16 are furled in the outer sheath tube 4.

For the mechanical fixation who establishes the formula of inlaying between the snare loop 1 and the cutting knife 16 in this application, the distal end of the snare loop 1 is worn to establish in the handle of a knife 161 of cutting knife 16 and is inlayed and locate handle of a knife 161, and this fixed connection stable in structure is reliable, effectively avoids cutting knife 16 to drop from the distal end accident of snare loop 1 to improve the security of operation.

Further, as shown in fig. 9 to 11, the shank 161 of the cutting blade 16 has a blade connecting portion 164 located between two recesses 163, and a through hole 165 is opened at a distal end of the blade connecting portion 164, that is, at a distal end of the recess 163; as shown in fig. 8, a loop connecting portion 101 shaped in a U shape is integrally provided at a distal end of the snare loop 1, the loop connecting portion 101 includes a first bending portion 102, a second bending portion 103, and a third bending portion 104 which are connected in sequence, the second bending portion 103 is inserted into the through hole 165, and the first bending portion 102 and the third bending portion 104 are respectively accommodated in the two grooves 163. In this way, the grommet 1 is fitted to the blade connecting portion 164 of the holder 161 via the U-shaped ring connecting portion 101. In the process of connecting the cutting knife 16 and the snare loop 1, the snare loop 1 is firstly inserted into the through hole 165 of the cutting knife 16, and then the first bending section 102, the second bending section 103 and the third bending section 104 are sequentially bent and formed at the far end of the snare loop 1, so that the snare loop 1 and the handle 161 of the cutting knife 16 can be fixedly embedded, and meanwhile, the shaping of the far end tip shape of the snare loop 1 is also completed. Preferably, the snare loop 1 and the handle 161 are welded or bonded, so as to further ensure the reliability of the fixed connection between the snare loop 1 and the handle 161.

Further, the cutting blade 16 is an integrally formed part. The cutting head 162 is a cutting part of the cutting knife 16, the cutting head 162 may have various shapes, such as a mushroom head shape as shown in fig. 12a, a gate nail shape as shown in fig. 12b, an L shape as shown in fig. 12c, a straight line shape as shown in fig. 12d, or a triangular shape as shown in fig. 12e and 12f, and the cutting knife 16 with the cutting head 162 having a suitable shape is selected according to the effective cutting of different lesion tissues and the operation habit of a doctor during the operation.

Furthermore, the snare loop 1 is formed by a plurality of strands of braided wires made of stainless steel, or a plurality of strands of braided wires made of nickel titanium, or a plurality of strands of braided wires made of a plurality of materials of stainless steel and nickel titanium through compounding, or a monofilament made of stainless steel, or a monofilament made of nickel titanium, and the snare loop ensures that the head end of the distal end is not deformed and damaged after long-time electrifying and cutting; meanwhile, the snare loop 1 has certain rigidity and can keep stable when used as a needle knife.

Further, the preferred embodiment of the novel medical electric knife is as follows: as shown in fig. 1, the handle assembly comprises a handle seat 7 fixed to the proximal end of the outer sheath 4, and an operating handle 12 slidably engaged with the handle seat 7 along the extending direction of the outer sheath 4, wherein the operating handle 12 is slidable relative to the handle seat 7 along the extending direction of the outer sheath 4; the novel medical electric knife comprises a guide pipe 9, a protection pipe 3 and an electric coagulation electrode 5 besides the ring sleeve ring 1, the cutting knife 16, the outer sheath pipe 5, the traction rope 6, the handle seat 7 and the operation handle 12. Specifically, the catheter 9 is movably arranged in the handle seat 7 in a penetrating way, the catheter 9 is fixedly connected with the proximal end of the traction rope 6, the protection tube 3 is fixedly connected with the distal end of the outer sheath tube 4, the electrocoagulation electrode 5 is arranged at the distal end section of the outer sheath tube 4 and is fixed in the outer sheath tube 4, and therefore the electrocoagulation electrode 5 is close to the proximal end of the protection tube 3. The handle seat 7 is provided with a gas-liquid connector 10, a gas-liquid channel 701 is formed inside the handle seat, the gas-liquid connector 10 is used for being connected with a gas source (such as a gas storage tank 14) or a liquid source (such as an injector 15), and the gas-liquid channel 701, the inner cavity of the outer sheath tube 4 and the inner cavity of the protection tube 3 are sequentially communicated along the direction from the far end to the near end. The operating handle 12 is provided with an electrical connector 11 for connection to the catheter 9, the electrical connector 11 being adapted for connection to a power source (e.g. a high frequency power source 13), the catheter 9, the pull cord 6 and the snare loop 1 being electrically conductive.

In the above-mentioned novel medical electrotome, when executing the art person and removing operating handle 12 at the distal end, operating handle 12 passes through pipe 9 and drives haulage rope 6 and remove, and haulage rope 6 drives snare loop 1 and cutting knife 16 and removes together, realizes from this that cutting knife 16 and snare loop 1 release from protection tube 3 and draw into in outer sheath pipe 4 with cutting knife 16 and snare loop 1. When the operating handle 12 is pushed forwards, the traction rope 6 drives the snare loop 1 and the cutting knife 16 to move together along the direction close to the far end; when the operating handle 12 is pulled backwards, the pulling string 6 brings the snare loop 1 together with the cutting blade 16 in a direction close to the proximal end. Preferably, as shown in fig. 1, the novel medical electrotome further comprises a connecting tube 2 disposed inside the sheath tube 4, the connecting tube 2 is disposed between the snare loop 1 and the pull rope 6, the distal end and the proximal end of the connecting tube 2 are respectively fixedly connected to the proximal end of the snare loop 1 and the distal end of the pull rope 6, and the fixing manner may be crimping, welding, or gluing. The novel medical electric knife has the functions of injection, electrotomy, electric coagulation and electric excision and electric coagulation of edges.

The aeration liquid joint 10, the handle seat 7, the conduit 9, the gas-liquid cavity 701, the outer sheath tube 4 and the protection tube 3 form an injection unit of the novel medical electrotome. When the novel medical electric knife starts the injection function, the operating handle 12 is pulled backwards, so that the cutting knife 16 and the snare loop 1 are folded in the sheath tube 4; the distal end of the protective tube 3 is pressed against a small incision previously made in the mucosal tissue, and when the syringe 15 is connected to the air/liquid joint 10 and liquid is injected, the liquid flows out through the air/liquid channel 701, the inner cavity of the outer sheath tube 4 and the protective tube 3 in sequence, thereby performing an injection bump operation. Alternatively, if the field of vision is blocked by blood or other contaminants during the operation, the syringe 15 can be used to inject physiological saline through the vent adapter 10 on the handle holder 7, and the physiological saline is sprayed from the distal end of the protective tube 3 to wash out the area within the field of vision, thereby performing the intra-operative washing operation.

The electric cutting unit of the novel medical electric knife comprises an electric connector 11, an operating handle 12, a catheter 9, a handle seat 7, an outer sheath tube 4, a traction rope 6, a connecting tube 2, a ring lantern ring 1 and a cutting knife 16. When the novel medical electrotome starts the electrotomy function, the operating handle 12 is pushed forward, the cutter head 162 at the far end of the cutting knife 16 extends out of the protective tube 3, the power-on connector 11 and the high-frequency power supply 13 are switched on, and the current is conducted to the cutting knife 16 through the power-on connector 11, the catheter 9, the traction rope 6 and the ring surrounding ring 1 in sequence, so that electrotomy operation is implemented. Such as: a polyp, a snare resection operation of tissue, or a foreign body snare retrieval operation may be performed.

The electrocoagulation unit of the novel medical electrotome comprises an electrifying joint 11, an operating handle 12, a guide pipe 9, a ventilating liquid joint 10, a handle seat 7, a gas-liquid cavity 701, an outer sheath pipe 4, a traction rope 6, a connecting pipe 2, a ring sleeve ring 1, a cutting knife 16, a protection pipe 3 and an electrocoagulation electrode 5. When the novel medical electric knife starts the electrocoagulation function, the operating handle 12 is pulled backwards, so that the cutting knife 16 and the snare loop 1 are completely furled in the outer sheath tube 4, and at the moment, as shown in figure 2, the snare loop 1 is in contact fit with the electrocoagulation electrode 5; the electric connector 11 and the high-frequency power supply 13 are connected, the aeration liquid connector 10 is connected with a gas storage tank 14 filled with inert gas, the gas storage tank 14 supplies the inert gas, the inert gas is sequentially conveyed to the electrocoagulation electrode 5 through a gas-liquid cavity 701 and the inner cavity of the outer sheath tube 4, the inert gas is ionized at the electrocoagulation electrode 5, the ionized gas is sprayed to the surface of the tissue at high speed through the protection tube 3 to perform coagulation hemostasis, and therefore the electrocoagulation operation is performed. This electrocoagulation is: blood coagulation and hemostasis are performed by inert gas being ionized. Such as: argon gas is used for ionization at the electrocoagulation electrode 5, and marking of an operation range or coagulation hemostasis operation of a wound surface is carried out on tissues.

The novel medical electric knife edge electric cutting and coagulating unit consists of an electric connector 11, an operating handle 12, a conduit 9, a handle seat 7, an outer sheath tube 4, a traction rope 6, a connecting tube 2, a ring lantern ring 1 and a cutting knife 16. When the novel medical electric knife starts the electric edge cutting electrocoagulation function, the operating handle 12 is pushed forwards, so that the cutting knife 16 and the cutting part at the far end of the snare loop 1 extend out of the protection tube 3, as shown in fig. 3, the power-on connector 11 is connected with the high-frequency power supply 13, and the cutting edge cutting and electrocoagulation operation is carried out by the cutting part at the far end of the snare loop 1. This electrocoagulation is: the cutting part of the metal snare ring 1 is electrified to burn the tissue at high temperature to implement blood coagulation and hemostasis. For example, when performing the incisional wound and electrocoagulation, the operations of mucosal tissue incisional and local electrocoagulation cauterization hemostasis can be performed.

Therefore, the novel medical electrotome can realize injection operation, electrotomy operation, electrocoagulation operation, and edge electrotomy and electrocoagulation operation, thereby being capable of completely, independently and safely completing ESD operation, and avoiding exchanging instruments such as injection needles for injection uplift operation, thereby reducing ESD operation cost and ESD operation time.

Preferably, as shown in fig. 4, the electrocoagulation electrode 5 comprises a section of spiral spring tube 501 and a pin 502 extending from the distal end of the spiral spring tube 501 to a direction close to the protection tube 3, the pin 502 extending to the protection tube 3 attachment. As shown in figure 2, the electrocoagulation electrode 5 is spaced from the protection tube 3 by a distance in the range of 0-50mm, and the electrocoagulation electrode 5 is closer to the operation handle 12 relative to the protection tube 3.

Further, as shown in fig. 2 and 5a, the protection tube 3 comprises a hollow cylindrical section 301 extending into the interior of the outer sheath tube 4, and a hollow conical section 302 integrally extending from a distal end of the hollow cylindrical section 301 and located outside the outer sheath tube 4, the protection tube 3 having a maximum outer diameter at a proximal end of the hollow conical section 302 such that the protection tube 3 has an arrowhead shape. The maximum outer diameter of the protection tube 3 is the same as the outer diameter of the outer sheath tube 4, so that smooth transition between the protection tube and the outer sheath tube can be ensured, and unsmooth access to the clamp channel caused by uneven surface in use can be prevented. The outer peripheral surface of the hollow cylindrical section 301 of the protection tube 3 is attached to the inner wall of the outer sheath tube 4 and fixed in a tight fit manner. Preferably, the outer surface of the hollow cylindrical section 301 is provided with a bulge 303 which is tightly matched with the inner wall of the outer sheath tube 4, or the contact surface of the protection tube 3 and the outer sheath tube 4 is a non-smooth surface, so that the protection tube 3 can be prevented from being loosened and separated from the outer sheath tube 4; the protrusion 303 on the protective tube 3 may be a barb-shaped protrusion 303 as shown in fig. 5b, or a ring-shaped protrusion 303 as shown in fig. 5c, or a rectangular protrusion 303 as shown in fig. 5d, or a combination of various shapes. In addition, in the actual operation of the injection bump, the novel medical electrotome is adjusted to the electric electrocoagulation state of the edge, at the moment, the cutting part at the distal end of the snare loop 1 extends out of the protection tube 3, a small opening is cut on the mucosa tissue after electrification, then the snare loop 1 is completely pulled back to the outer sheath tube 4, and the port at the distal end (namely the tip of the arrow head) of the protection tube 3 is propped against the cut to implement the injection bump. Because the distal end port of the protection tube 3 is a conical structure with a smaller diameter, the distal end port is easy to insert into the opening part of the mucosa tissue, so that the injection bulging operation is simple and effective.

Further, as shown in fig. 1, the novel medical electric knife further includes a star-shaped tube 18 disposed in the sheath tube 4 and sleeved on the traction rope 6, and a limiting tube 17 abutting against two ends of the star-shaped tube 18 and fixed on the traction rope 6, wherein a convex strip 181 is disposed on an outer circumferential surface of the star-shaped tube 18. The star-shaped tube 18 and the traction rope 6 are relatively fixed by the two limiting tubes 17, unexpected sliding of the star-shaped tube 18 is prevented, particularly, the star-shaped tube 18 with the convex strip 181 is arranged outside the traction rope 6 in a sleeved mode, local radial thickening can be performed on the traction rope 6, the gap between the traction rope 6 and the outer sheath tube 4 is reduced, the stability of axial movement of the traction rope 6 in the outer sheath tube 4 is improved, the snare loop 1 is stably extended from the far end of the protection tube 3, the stability of an instrument in the operation process is further ensured, retraction is not easy to occur or the time delay during extension and retraction is eliminated, and finally the operation safety is improved. As shown in FIG. 6a and FIG. 6b, the star tube 18 is hollow inside and allows the pulling rope 6 to pass through, and the number of the convex strips 181 on the outer periphery of the star tube 18 is 1-10. The biggest external diameter of star venturi tube 18 is less than the internal diameter of sheath pipe 4 for star venturi tube 18 can remove in sheath pipe 4 along with haulage rope 6, and the not protrusion position on the star venturi tube 18 outer peripheral face reserves sufficient passageway for inert gas, guarantees the normal use of novel medical electrotome electricity coagulation function. The fixing mode between the traction rope 6 and the limiting pipe 17 can be crimping, welding, gluing, riveting or the like. The star-shaped tube 18 can be made of PP, PTFE, PE and PA materials, so that the star-shaped tube 18 has certain rigidity and lubricating property, and can be stably used under a thin-wall structure.

Further, as shown in fig. 7, the handle seat 7 is provided with an electric conduction channel 702 at the electric conduction joint 11 for accommodating a part of the conduit 9, the inside of the handle seat 7 is fixedly provided with a sealing device 8, the sealing device 8 isolates the electric conduction channel 702 and the gas-liquid channel 701, the conduit 9 is movably inserted into the sealing device 8, the conduit 9 passes through the gas-liquid channel 701 and passes through the middle of the sealing device 8 to be connected with the electric conduction joint 11, the sealing device 8 prevents the inert gas or liquid in the gas-liquid channel 701 from leaking to the electric conduction channel 702, and the inert gas or liquid in the gas-liquid channel 701 is ensured to flow in the distal direction along the gap between the outer sheath tube 4 and the traction rope 6. Preferably, the sealing device 8 is formed by arranging 1-8O-rings in parallel along the extending direction of the conduit 9, the O-rings are arranged in parallel in the inner hole of the handle seat 7 and fixed by a pressing block 19 made of a non-metallic material, the pressing block 19 can be fixed in the handle seat 7 by gluing, ultrasonic welding, riveting or crimping, the pressing block 19 applies a certain axial pressure to the O-rings, and the O-rings deform after being pressed to seal the conduit 9 penetrating in the inner hole.

Further, handle components in this application is a handle components that can lock, can guarantee cutting knife 16 and the length of stretching out of the snare loop 1, improves the operational performance of novel medical electrotome. In particular, as shown in fig. 13 to 21, the lockable handle assembly comprises, in addition to the operating handle 12 and the handle seat 7, a locking assembly; wherein, the operating handle 12 is provided with a through hole 12b, and the through hole 12b is vertical to the sliding direction of the operating handle 12; an open slot axially extending along the sliding direction of the operating handle 12 is arranged in the handle seat 7; the locking assembly comprises a rotating rod 20 penetrating through the through hole 12b, an end 20c of the rotating rod 20 is located in the open slot, as shown in fig. 20, and the end 20c of the rotating rod 20 has two opposite long planar sides, and the length a of the long side is greater than the length b of the other sides. In particular, when the other side of the rotating lever 20 coincides with the opening width direction of the open groove, as shown in fig. 19, the operating handle 12 is axially movable relative to the handle holder 7; when the rotating lever 20 is rotated to make the long side of the rotating lever 20 coincide with the opening width direction of the open slot, as shown in fig. 21, the rotating lever 20 enlarges the opening of the open slot, so that the outer wall surfaces 7c and 7d of the handle seat 7 are tightly pressed against the via hole wall surfaces 12c and 12d of the operating handle 12, and the handle seat 7 and the operating handle 12 are locked.

Therefore, when pushing and pulling are required, the other side surfaces of the rotating rod 20 are consistent with the opening width direction of the opening groove of the handle seat 7 through the locking assembly, and the handle seat 7 can axially move relative to the operating handle 12 to realize pushing and pulling. When locking and positioning are needed, the rotating rod 20 is rotated, so that the long side surface of the rotating rod 20 is consistent with the width direction of the opening of the open slot, the rotating rod 20 presses the handle seat 7, the open slot on the handle seat 7 is expanded, the handle seat 7 is tightly matched with the operating handle 12, and the handle seat 7 and the operating handle 12 are locked relatively and cannot move axially relatively, namely, the relative position of the handle seat 7 is locked.

Preferably, as shown in fig. 13 and 20, the locking assembly further includes a rotating block 21, and the rotating block 21 is fixedly connected to the rotating rod 20 by crimping, riveting, ultrasonic welding, gluing or snap-fitting. In the embodiment, the rotating rod 20 is divided into three sections, namely, a middle section 20b with a cylindrical middle part, an end part 20a arranged at the top of the middle section 20b, and an end part 20c arranged at the bottom of the middle section 20b, wherein the end part 20a and the end part 20c are both flat; the end 20a at the top of the rotating rod 20 forms a positioning section of the rotating rod 20, the end 20a is clamped in the clamping hole 21a of the rotating block 21, and the rotating block 21 is screwed to drive the rotating rod 20 to rotate, so that the operation is convenient; the end 20c of the rotating rod 20 at the bottom thereof forms a locking segment of the rotating rod 20, and the end 20c is inserted into the opening groove of the handle seat 7.

Specifically, as shown in fig. 18 and 20, in the present embodiment, the end portion of the rotating rod 20 is further provided with two

short side surfaces

20e and 20f which are opposite to each other and are planar, the

short side surfaces

20e and 20f are connected to the long side surface through the arc surface 20c1, and when the

short side surfaces

20e and 20f are consistent with the opening width direction of the opening slot, the handle holder 7 is axially movable relative to the operating handle 12. In the embodiment, the short side surface, the arc surface and the long side surface are arranged, so that the rotation of the rotating rod 20 is facilitated while the locking and the positioning are facilitated.

As shown in fig. 17, the length c of the opening slot of the handle seat 7, the length b of the

short side surfaces

20e and 20f of the rotating rod 20, and the length of the long side surface of the rotating rod 20 are a, which can also be understood as the distance between two opposite

short side surfaces

20e and 20f is a, and the distance between two opposite long side surfaces is b, which satisfies a > c > b; a transition arc (namely the arc surface 20c1) is arranged between the long side surface and the short side surface, so that the rotating rod 20 can rotate smoothly, and the opening groove of the handle seat 7 can be opened outwards.

For better positioning, as shown in fig. 16 and 20, the outer peripheral wall of the rotating rod 20 has a ring of circumferential flanges 20d with openings, the operating handle 12 is provided with a raised limiting part 12a at the through hole 12b, the limiting part 12a is located in the opening of the circumferential flange 20d, and when one end surface 20d2 of the circumferential flange 20d is abutted against one side surface 12a2 of the limiting part 12a during the rotation of the rotating rod 20, as shown in fig. 18 and 19, the other side surfaces of the rotating rod 20 are aligned with the opening width direction of the open slot; as shown in fig. 20 and 21, when the other end surface 20d1 of the annular flange 20d collides with the other side surface 12a1 of the stopper 12a, the long side surface of the rotating lever 20 coincides with the opening width direction of the open groove. In this embodiment, the circumferential flange 20d of the rotating rod 20 is located near the locking section, and is used for stopping and limiting, so as to prevent the rotating rod 20 from falling off from the through hole 12b and prevent the rotating rod 20 from rotating at an excessive angle, which results in poor locking effect.

In the handle assembly of the present embodiment, when in use, the rotating block 21 is rotated to drive the rotating rod 20 to rotate synchronously, as shown in fig. 20 and 21, until the surface 20d1 on the rotating rod 20 abuts against the surface 12a1 of the operating handle 12 to stop rotating, at this time, the

short side surfaces

20e and 20f of the rotating rod 20 respectively support and act on the surface 7b and the surface 7a of the handle seat 7, so that the handle seat 7 is spread towards two sides, and the surface 7c and the surface 7d of the spread handle seat 7 respectively support and act on the

surfaces

12c and 12d of the operating handle 12, thereby forming the effect that the handle seat 7 is locked by the rotating rod 20 and the operating handle 12; the reverse rotation rotating block 21 drives the rotating rod 20 to rotate reversely, as shown in fig. 18 and 19, until the surface 20d2 abuts against the surface 12a2 of the operating handle 12 to stop rotating, so that the handle seat 7 is unlocked, and the locking can be realized, thereby meeting the length requirement of a user for pushing and pulling the handle seat 7 to realize the locking requirement of the extension length of the electric knife.

To sum up, above-mentioned novel medical electrotome is in the use, according to doctor's needs, through promoting the back and forth slip of operating handle 12 on handle seat 7, control snare ring 1 and cutting knife 16's position, select switch-on high frequency power supply 13 again as required, switch-on gas holder 14, and switch-on syringe 15, inject the operation, electrocision operation, the electricity congeals the operation, and marginal electricity is surely and the electricity congeals the operation, thereby realize selecting excision scope mark, the injection uplift, the mucosa is cut open and is peeled off, and hemostasis function, finally can be complete, independent, safe completion ESD operation, remove from instruments such as the syringe needle that the exchange is used for injecting the uplift operation from. Therefore, the novel medical electrotome has the advantages of integrated function, simple structure, safe and convenient operation, shortened operation time, reduced operation difficulty and saved treatment cost. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a novel tool bit subassembly of medical electrotome, includes snare loop (1) and cutting knife (16), cutting knife (16) include with snare loop (1) distal end fixed link to each other handle of a knife (161) and link firmly tool bit (162) at handle of a knife (161) distal end, its characterized in that: the tool comprises a tool holder (161), and is characterized in that two symmetrically-arranged grooves (163) extending along the length direction of the tool holder (161) are formed in the surface of the tool holder (161), the tool holder (161) is provided with a tool connecting part (164) positioned between the two grooves (163), the tool holder (161) is further provided with a through hole (165) penetrating through the tool holder (161) in the far end of the tool connecting part (164), two ends of the through hole (165) are respectively communicated with the two grooves (163), the far end of a ring-shaped ring (1) penetrates through the through hole (165), and the part of the ring-shaped ring (1) positioned on two sides of the through hole (165) is limited in the grooves (163), so that the far end of the ring-shaped ring (1) is embedded and fixed with the tool holder (161); the cutting knife (16) is an integrally formed part;

the far end of the hoop ring (1) is integrally provided with a U-shaped ring connecting part (101), the ring connecting part (101) comprises a first bending section (102), a second bending section (103) and a third bending section (104) which are sequentially connected, the second bending section (103) penetrates through a through hole (165), and the first bending section (102) and the third bending section (104) are respectively accommodated in two grooves (163); in the process of connecting the cutting knife (16) and the snare loop (1), the snare loop (1) is firstly penetrated in a through hole (165) of the cutting knife (16), and then the first bending section (102), the second bending section (103) and the third bending section (104) are sequentially bent and formed at the far end of the snare loop (1), so that the snare loop (1) and a knife handle (161) of the cutting knife (16) can be mechanically fixed in an embedded manner, and the shaping of the tip shape of the far end of the snare loop (1) is also completed; and the ring sleeve ring (1) and the knife handle (161) are welded or bonded.

2. The cutter head assembly of claim 1 wherein: the snare loop (1) is formed by a plurality of strands of braided wires made of stainless steel, or a plurality of strands of braided wires made of nickel titanium, or a plurality of strands of braided wires made of a plurality of materials of stainless steel and nickel titanium after being compounded, or a monofilament made of stainless steel, or a monofilament made of nickel titanium.

3. The cutter head assembly of claim 1 wherein: the tool bit (162) is mushroom head type, or door nail type, or triangle type, L type or linear type.

4. The utility model provides a novel medical electrotome, includes sheath pipe (4), movably wears to establish haulage rope (6) in sheath pipe (4) and is used for driving handle components that haulage rope (6) removed, its characterized in that: a cutter head assembly according to any of claims 1 to 3, further comprising a snare loop (1) having a proximal end fixedly attached to a distal end of the pull cord (6).

5. The novel medical electrotome according to claim 4, characterized in that: the handle assembly comprises a handle seat (7) fixed with the near end of the outer sheath tube (4) and an operating handle (12) in sliding fit with the handle seat (7) along the extension direction of the outer sheath tube (4); the novel medical electric knife also comprises a catheter (9) which is movably arranged in the handle seat (7) in a penetrating way and is fixed with the near end of the traction rope (6), a protection tube (3) which is fixed at the far end of the outer sheath tube (4), and an electric coagulation electrode (5) which is fixed in the outer sheath tube (4); the handle seat (7) is provided with a ventilation liquid joint (10), a gas-liquid channel (701) is formed in the handle seat, the ventilation liquid joint (10) is used for being connected with a gas source or a liquid source, and the gas-liquid channel (701), the inner cavity of the outer sheath tube (4) and the inner cavity of the protection tube (3) are communicated in sequence; the operating handle (12) is provided with an electrified joint (11) connected with the catheter (9), the electrified joint (11) is used for being connected with a power supply, and the catheter (9), the traction rope (6) and the snare loop (1) can conduct electricity; the electrocoagulation electrode (5) is arranged at the distal section of the outer sheath tube (4) and is close to the proximal end of the protection tube (3), and when the snare loop (1) is furled in the outer sheath tube (4), the snare loop (1) can be in contact fit with the electrocoagulation electrode (5).

6. The novel medical electrotome according to claim 4, characterized in that: still including setting up connecting pipe (2) inside sheath pipe (4), connecting pipe (2) set up between snare loop (1) and haulage rope (6), the distal end and the near-end of connecting pipe (2) are fixed phase with the near-end of snare loop (1) and the far-end of haulage rope (6) respectively and are even.

7. The novel medical electrotome according to claim 4, characterized in that: still including setting up in outer sheath pipe (4) and establishing star venturi tube (18) on haulage rope (6) and butt at star venturi tube (18) both ends and all fix spacing pipe (17) on haulage rope (6), be provided with sand grip (181) on the outer peripheral face of star venturi tube (18), the biggest external diameter of star venturi tube (18) is less than the internal diameter of outer sheath pipe (4).

8. The novel medical electrotome according to claim 5, characterized in that: the protection tube (3) comprises a hollow cylindrical section (301) extending into the outer sheath tube (4) and a hollow conical section (302) integrally extending from the far end of the hollow cylindrical section (301) and located outside the outer sheath tube (4), the protection tube (3) has the maximum outer diameter at the near end of the hollow conical section (302), the maximum outer diameter is the same as the outer diameter of the outer sheath tube (4), and a bulge (303) tightly matched with the inner wall of the outer sheath tube (4) is arranged on the outer surface of the hollow cylindrical section (301).

9. The novel medical electrotome according to claim 5, characterized in that: the handle seat (7) is provided with an electrifying cavity channel (702) for accommodating part of the guide pipe (9) at the position of the electrifying connector (11), a sealing device (8) for isolating the electrifying cavity channel (702) and the gas-liquid cavity channel (701) is fixedly arranged in the handle seat, and the guide pipe (9) is movably arranged in the sealing device (8) in a penetrating way.

10. The novel medical electrotome according to claim 5, characterized in that: the handle assembly further comprises a locking assembly; the operating handle (12) is provided with a through hole (12 b), and the through hole (12 b) is vertical to the sliding direction of the operating handle (12); the handle seat (7) is provided with an open slot extending along the sliding direction of the operating handle (12); the locking assembly comprises a rotating rod (21) penetrating through a through hole (12 b), the end part of the rotating rod (21) is positioned in an open slot, the end part of the rotating rod (21) is provided with two opposite planar long side surfaces, and the length of each long side surface is greater than that of the other side surfaces;

when the other side surfaces of the rotating rod (21) are consistent with the opening width direction of the open slot, the operating handle (12) can axially move relative to the handle seat (7); it is rotatory rotary rod (21), make when the long side of rotary rod (21) is unanimous with the opening width direction of open slot, rotary rod (21) will enlarge the aperture of open slot, make the outer wall of handle seat (7) supports tightly with the via hole wall of operating handle (12), will handle seat (7) and operating handle (12) locking.