CN112294429B

CN112294429B - Electric knife

Info

Publication number: CN112294429B
Application number: CN202010980655.5A
Authority: CN
Inventors: 徐宏; 秦翔翔; 王耀辉; 叶亚彬
Original assignee: Hangzhou Kunbo Biotechnology Co Ltd
Current assignee: Hangzhou Kunbo Biotechnology Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-09-10
Anticipated expiration: 2040-09-17
Also published as: CN112294429A

Abstract

The application provides an electrotome, the electrotome includes interconnect's body and electrode, the body has relative distal end and near-end, the body includes multistage sheath pipe by near-end to far-end, and the elastic modulus of each section sheath pipe reduces gradually, and wherein one section sheath pipe that is located the most distal end is first sheath pipe, the electrode including fixed bury underground in the built-in section of first sheath pipe and extend the external section of first sheath pipe to discharge through external section, the built-in section has the fretwork district through deformation in order to adapt to the electrode is crooked. The application provides an electrotome convenient to use, the security is high.

Description

Electric knife

Technical Field

The application relates to the technical field of medical instruments, in particular to an electrotome.

Background

Surgery is currently used to treat pathological tissue conditions of the respiratory system, and the use of this treatment is limited. For example, surgical removal of the diseased portion of the lung typically results in a reduction in the effective lung dose of about 15-30%, which may not be sufficient to cause a significant increase in lung function. Meanwhile, lung cancer patients with older age, weak constitution, poor heart and lung functions or complications are not suitable for or tolerant to conventional surgical resection therapy.

Therefore, minimally invasive surgery gradually enters the visual field of people, such as a plurality of local treatment methods of tumor minimally invasive ablation and the like. The tumor minimally invasive Ablation of the lung comprises Radio Frequency Ablation (RFA), cryoablation, microwave Ablation and the like, wherein only the Radio Frequency Ablation is listed by the non-small cell lung cancer clinical guidance of the United states national comprehensive cancer network.

The principle of the radio frequency ablation is that alternating high-frequency current with the frequency less than 30MHz (generally 460-480 kHz) is applied to enable ions in tumor tissues to generate high-speed oscillation and mutual friction, radio frequency energy is converted into heat energy, and therefore coagulative necrosis of tumor cells occurs.

In radiofrequency ablation therapy, the device used is an electrotome, the distal electrode of which is capable of transmitting radiofrequency energy to the tissue surrounding the site of penetration after percutaneous penetration. When the common electrotome is used for treating pathological tissues of a respiratory system, the operation convenience and the safety are not ideal.

Disclosure of Invention

The application provides an electrotome, convenient to use, the security is high.

The utility model provides an electrotome, body and electrode including interconnect, the body has relative distal end and near-end, the body includes multistage sheath by near-end to distal end, and the elastic modulus of each section sheath reduces gradually, and wherein one section sheath that is located the farthest end is first sheath, the electrode including fixed bury underground in the built-in section of first sheath and extend the external section of first sheath to discharge through external section, the built-in section has the fretwork district through deformation in order to adapt to the electrode is crooked.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the electrode is of a tubular structure, and a part corresponding to the hollow area is a hollow section.

Optionally, the internal section and the external section are formed by integrally cutting a pipe.

Optionally, the length of the hollow-out section is 5-8 cm.

Optionally, the hollow-out section is fixed in the pipe wall of the pipe body in a hot melting mode, and is completely wrapped by the pipe wall.

Optionally, the hollow-out section is of a spiral band structure, and a gap between adjacent circles of the spiral band is used as the hollow-out area.

Optionally, the ribbon has a width of M1, and the gap between adjacent turns of the ribbon has a width of M2, and satisfies M2>0.5 × M1.

Optionally, a woven mesh is embedded in the pipe body, and the built-in section and the axial position of the woven mesh are overlapped.

Optionally, the mesh grid is made of metal and is insulated from the hollow section.

Optionally, the hollow section extends to a proximal end of the first sheath; the distal end of the mesh fabric extends into the first sheath.

Optionally, a second sheath is disposed at a proximal side of the first sheath, the hollow section extends into the second sheath, and a distal end of the mesh grid extends into the second sheath.

Optionally, the hollow section is located in the first sheath and is a first connecting section, and the length of the first connecting section is L1;

the hollow section is positioned in the second sheath tube and is a second connecting section, and the length of the second connecting section is L2;

and L1 is 3-10 times of L2.

Optionally, the discharge head further comprises a discharge head closing the distal opening of the electrode.

Optionally, the discharge head sequentially includes, from the proximal end to the distal end:

the tail section is connected to the far end part of the external section;

the conical section, the conical tip position of conical section has the transition cambered surface.

Optionally, a limit step abutting against the distal end face of the external section is arranged between the tail section and the conical section.

Optionally, the tail section is inserted into the external section, and the outer peripheral surface of the limiting step is flush with the outer peripheral surface of the external section.

Optionally, the discharge head and the electrode are detachably connected or welded and fixed.

Optionally, a smoke exhaust hole is formed in the side wall of the pipe body, which is adjacent to the far end, and the position of the smoke exhaust hole corresponds to the position of the hollowed-out area.

Optionally, a plurality of smoke discharge holes are arranged along the length direction of the pipe body.

Optionally, the arrangement mode of the smoke discharge holes is matched with the shape of the hollowed-out area.

Optionally, the device further comprises an operating handle connected to the proximal end of the tube body and a lead for delivering energy to the electrode;

a first channel and a second channel are arranged in the operating handle, and two ends of the first channel are respectively arranged outside the operating handle; one end of the second channel is communicated with the first channel, and the other end of the second channel is opened outside the operating handle; the pipe body penetrates through the first channel;

the far end of the wire is electrically connected with the electrode, the middle section of the wire is fixedly embedded in the pipe wall of the pipe body, and the near end of the wire penetrates out of the pipe wall and then is connected with an external power supply through the second channel.

Optionally, the wire is coated with insulating paint; in the pipe wall of the pipe body, the conducting wire, the woven mesh and the hollow section are insulated in pairs, and the far end of the conducting wire is electrically connected with the far end side of the hollow section.

Optionally, a power device for driving medium in the tube body to flow is connected to the proximal end of the first channel, and the distal end of the electrode is used as a fluid passing port.

Optionally, the distal end of the external segment is provided with a sharpened portion.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of an electrotome according to the present application;

FIG. 2 is an exploded view of a distal portion of an embodiment of the electrotome of the present application;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is an internal structural view of an embodiment of the electrotome of the present application;

FIG. 5 is an enlarged view of area B of FIG. 4;

FIG. 6 is a schematic structural view of an operating handle in an embodiment of the electric knife of the present application;

fig. 7 is an internal structure view of a sharpening portion in an embodiment of the electric knife of the present application.

The reference numerals in the figures are illustrated as follows:

1. a pipe body; 11. a first sheath tube; 12. a second sheath; 2. an electrode; 21. a built-in section; 22. an external section; 23. a hollow-out area; 24. cutting a tip part; 25. puncturing the inclined plane; 3. a discharge head; 31. a tail section; 32. a tapered section; 33. a transition arc surface; 34. a limiting step; 4. a smoke vent; 5. an operating handle; 51. a first channel; 52. a second channel; 53. a remote interface; 54. a proximal interface; 6. a wire; 61. insulating paint; 7. banana junctions; 8. a luer fitting.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

In the prior art, the electrotome includes a tubular body made of an insulating material and a tubular electrode connected to a distal end of the tubular body.

The inventor finds that the mechanical properties of the electrode and the tube body are greatly different, so that the flexibility of the distal end of the electrotome has sudden change, and the operation convenience and the safety are not ideal.

As shown in fig. 1 and 2, in an embodiment, the electrotome provided by the present application includes a tube 1 and an electrode 2 connected to each other, the tube 1 has a distal end (an end close to a patient, such as an end indicated by an arrow X in fig. 1) and a proximal end (an end close to an operator) opposite to each other, the tube includes a plurality of sheath segments from the proximal end to the distal end, and the elastic modulus of each sheath segment is gradually reduced, wherein the sheath segment at the distal end is a first sheath 11, the electrode 2 includes an internal segment 21 fixedly embedded in the first sheath 11 and an external segment 22 extending out of the first sheath, and discharges electricity through the external segment 22, and the internal segment 21 has a hollow area 23 adapted to the bending of the electrode by deformation.

The electrode 2 can release electromagnetic wave energy in a radio frequency band (radio frequency current is generated when the electromagnetic wave energy acts on tissues) to the outside so as to generate corresponding medical action. However, with the present embodiment, it is not limited that the respective sections of the electrode 2 release the rf energy uniformly outward. In fact, the outer periphery of the external section 22 is not covered by the tube body 1 made of the insulating material, and the impedance between the outer periphery of the external section 22 and the tissues of the human body (or the animal) is small, so that most of the radio frequency energy is concentrated in the external section 22, the outer periphery of the internal section 21 is covered by the tube body 1 made of the insulating material, the impedance between the outer periphery of the internal section 21 and the tissues is large, the leaked radio frequency energy is basically negligible, and a controllable ablation focus is formed around the external section 22.

One of the purposes of providing the hollow-out area 23 in the built-in section 21 is to significantly reduce the bending stress of the built-in section 21. Specifically, the built-in section 21 can be changed from a straight state to an arc-shaped state by bending, the outer side of the arc is stretched, and the inner side of the arc is compressed. The increased length during the arc-shaped outer stretching is mainly contributed by the stretching deformation of the hollow-out areas 23, and the decreased length during the arc-shaped inner compressing is also mainly contributed by the compression deformation of the hollow-out areas 23, rather than being obtained mainly by changing the interatomic distance, so that the bending stress of the built-in section 21 is remarkably reduced.

The elastic modulus of each sheath section of the sheath tube of the embodiment is gradually reduced from the near to the far. The sheath near the near end is relatively hard, the control stability is good, and the electrode is convenient to be sent to the focus position. The sheath tube close to the far end is relatively soft and easy to deform, the control flexibility is good, the electrode is easy to adjust and is attached to the target tissue, the compliance is good, and the use is convenient.

Through set up fretwork district 23 at built-in section 21, the body 1 self material or the bonding material between body 1 and electrode 2 can radially fill and get into fretwork district 23, interfere in the axial of electrode 2 and take out the route. Therefore, the electrode 2 is pulled, the chemical bond force and the friction force between the peripheral surface of the electrode 2 and the tube body 1 are overcome, the large mechanical embedding force is overcome, the risk of falling off of the electrode 2 is greatly reduced, and the safety is high.

In one embodiment, the electrode 2 is a tubular structure. The electrode 2 may be made of various materials such as conductive polymer, conductive ceramic, and metal. When the electrode 2 is made of metal, the built-in section 21 is used as a liner or a framework, so that the thermal stability of the distal structure of the first sheath 11 can be improved.

When the electrode 2 is a tubular structure, the end part of the external section 22 is an opening, the end surface is annular, the contact area with tissues is small, the energy is relatively concentrated, and the electrode can be used for electrically cutting alveolar tissues. The peripheral surface of the external section 22 is cylindrical, such as a cylindrical surface, has a large contact area with tissues, has relatively dispersed energy, and can be used for performing electrocoagulation hemostasis on alveolar tissues.

In one embodiment, the inner and outer arcuate sections 21 may be provided with cuts extending radially in a tubular shape to form the hollow-out regions 23. When the arc-shaped body is bent, the notches on the outer side of the arc are opened, and the notches on the inner side of the arc are closed, so that the arc-shaped body can adapt to corresponding stretching and contracting deformation.

For convenience of processing, in one embodiment, the inner segment 21 and the outer segment 22 are integrally formed by cutting a pipe.

Specifically, as shown in fig. 3, in an embodiment, a portion corresponding to the hollow-out area 23 is a hollow-out section, the hollow-out section is a spiral band structure, and a gap between adjacent circles of the spiral band is used as the hollow-out area. The ribbon has a width of M1, and the gap between adjacent turns of the ribbon has a width of M2, and satisfies M2>0.5 × M1.

The helical ribbon structure can realize better bending flexibility, and can effectively prevent the first sheath 11 from generating creases at the bending part to block the fluid channel in the pipe body 1. Furthermore, by virtue of the resilience of the ribbon structure, an additional active supporting force can be obtained in order to position the electrode 2.

In order to further ensure the connection strength between the tube 1 and the electrode 2, in an embodiment, the portion corresponding to the hollow area 23 is a hollow section, and the length of the hollow section is 5-8 cm.

In the embodiment, the built-in section 21 is prolonged to strengthen connection, so that the leakage of radio frequency energy is less, and the influence on the effective power of the ablation instrument is small. The provision of the hollowed-out area 23 ensures that the bending stress of the first sheath 11 is not significantly increased after the extension of the built-in section 21.

In an embodiment, the hollow section is fixed in the pipe wall of the pipe body 1 by a hot melting method, and is completely wrapped by the pipe wall.

The hollow section is completely wrapped, so that the contact between the inner wall of the built-in section 21 and body fluid of a human body can be avoided, scabbing in the pipeline is reduced, and the utilization rate of radio frequency energy is improved. When the specific processing is carried out, the electrodes 2 can be pre-buried in the cavities when the tube body 1 is molded, the tube bodies 1 which are molded respectively can be sleeved outside the electrodes 2, the electrodes 2 are supported by core rods, and the whole tube body is formed by heating. When the pipe wall material continuously distributed tubular structure is bent, the inner side and the outer side of the bent portion bear compressive stress and tensile stress respectively, and the shape and the distribution of the hollow area are reasonably arranged, so that the bending stress can be effectively reduced.

Further, in one embodiment, the ribbon width M1 is 1.2-3.5 mm, and the gap width M2 is 1-1.7 times the ribbon width M1. The lift angle alpha of the spiral belt is 10-20 degrees. The thickness of the spiral belt is 1/7-1/4 of the thickness of the pipe body 1. The appropriate wall thickness of the spiral belt and the combined belt width can ensure the connection strength and also can take compliance and supporting force into consideration.

The helical band is close to the inner circumferential surface of the pipe body 1 in the radial direction of the pipe body 1. Specifically, the distance between the ribbon and the inner circumferential surface of the tube 1 is D1, the distance between the ribbon and the outer circumferential surface of the tube 1 is D2, and D2 is 5 to 9 times of D1.

In one embodiment, as shown in fig. 4, the hollow section is located inside the first sheath 11 as a first connecting section, and the first connecting section has a length L1; the hollow section in the second sheath 12 is a second connection section, and the length of the second connection section is L2; and L1 is 3-10 times of L2. The second sheath 12 may be a conductive segment having a bending property, and this arrangement enables the length of the second connection segment to ensure a high connection strength without significantly changing the bending property of the second sheath 12.

The first sheath 11 and the second sheath 12 made of different materials may be directly bonded or thermally fused at end surfaces, and the contact area of the connection portions is small. The application also provides another connection form, the first sheath tube 11 and the second sheath tube 12 are both connected to the peripheral surface of the built-in section 21, and the contact area of the connection part is larger and firmer.

In one embodiment, as shown in fig. 1 and 2, the electrotome further comprises a discharge head 3 closing the distal opening of the electrode 2. The electrotome can release radio frequency current to the tissue through the discharge head 3, and the discharge head 3 can be designed into a smooth cambered surface structure so as to reduce the damage of the opening of the electrode 2 to the normal tissue of the human body.

Specifically, in one embodiment, as shown in fig. 5, the discharge head 3 comprises a tail section 31 and a tapered section 32 in sequence from the proximal end to the distal end. The tail section 31 is connected to the far end part of the external section 22; the conical tip part of the conical section 32 is provided with a transition arc surface 33.

The size of the transition arc surface 33 should be adapted to the size of the lesion tissue to obtain a suitable range of action while avoiding scratching the normal tissue.

In order to further limit the axial sliding of the discharge head 3 relative to the outer segment 22, a limit step 34 abutting against the distal end face of the outer segment 22 is provided between the tail segment 31 and the tapered segment 32. In order to prevent the tissue from being scratched by the connecting part of the discharge head 3 and the external section 22, the tail section 31 is inserted into the external section 22, and the outer peripheral surface of the limiting step 34 is flush with the outer peripheral surface of the external section 22.

The limit step 34 is abutted against the far end of the external section 22, so that no obvious gap exists at the connecting part of the limit step and the external section in the axial direction. The two parts are flush with each other on the outer peripheral surface of the connecting part, so that steps caused by radial size difference are further avoided, and finally the purpose of preventing the connecting part of the discharge head 3 and the external section 22 from scratching tissues is achieved.

The discharge head 3 can be connected to the external section 22 in various ways, in one embodiment, the discharge head 3 and the external section 22 can be detachably connected, such as plug-in connection, threaded connection and the like, after the discharge head 3 is detached, the cross-sectional area of the distal end of the electrode 2 is reduced, the radio frequency energy is concentrated, and the electrode can be used for cutting pathological tissues. In another embodiment, the discharge head 3 is welded to the external segment 22 to ensure the connection strength.

In one embodiment, the side wall of the tube body 1 near the distal end is provided with a smoke vent 4, and the position of the smoke vent 4 corresponds to the position of the hollowed-out area.

When the distal end of the external section 22 is an open structure, smoke generated by charring the tissue can be discharged out of the body through the opening, so as to avoid injuring normal tissues. When the far end of the external section 22 is closed by the discharge head 3, the smoke generated by ablation can enter the tube body 1 through the smoke discharge hole 4 and the hollow area in sequence, and the smoke is discharged outside the body under the condition that power is applied to the outside (for example, the near end of the tube body 1 is connected with a vacuum pump).

Specifically, along the length direction of the pipe body 1, the smoke exhaust holes 4 are at least partially overlapped with the hollow areas. In one embodiment, as shown in FIG. 2, the smoke discharge holes 4 are arranged in a plurality along the length of the pipe body 1. Under the same smoke discharge flow, the pressure difference between the inside and the outside of the tube body 1 can be reduced by increasing the number of the smoke discharge holes 4, and the position change of the electrode 2 relative to a focus caused by the distortion of the tube body 1 during the exhaust is prevented.

In order to increase the number of the smoke discharge holes 4 while ensuring the radial support strength of the pipe body, in one embodiment, a plurality of smoke discharge holes 4 arranged along the length direction of the pipe body 1 are a group, and a plurality of groups of smoke discharge holes 4 are arranged along the circumferential direction of the pipe body 1. In order to ensure that the strength of the pipe body part corresponding to the hollowed-out areas is uniformly distributed in the length direction, the smoke exhaust holes 4 and the hollowed-out areas are uniformly arranged in the length direction, and the distance between every two adjacent rows of smoke exhaust holes 4 is matched with the distance between every two adjacent hollowed-out areas.

In another embodiment, the arrangement mode of the smoke discharge holes 4 is matched with the shape of the hollow-out area. When the shape of the hollow-out area is spiral, the plurality of smoke discharge holes 4 are arranged in a spiral mode.

In one embodiment, a woven mesh (not shown) is embedded in the tube body 1, and the axial positions of the built-in section 21 and the woven mesh are overlapped.

The distal end of the tube body 1 is radially reinforced by the hollowed-out section to prevent collapse. The proximal end of the tube 1 is provided with radial stiffening support against collapse by a woven mesh. The overlapping of the two support structures avoids the occurrence of weak links. In this embodiment, the position relationship between the hollowed-out section and the mesh grid in the radial direction is not limited, and the hollowed-out section and the mesh grid may or may not be in contact with each other. Thereby ensuring that the pipe body 1 has no weak link in the whole length direction and can not collapse or break locally.

In order to facilitate the processing, in an embodiment, the mesh grid is made of a metal material, and the mesh grid can be embedded in the tube body 1 in a hot melting mode. To further reduce the possibility of radio frequency energy leakage, the inner segment 21 and the mesh grid are insulated from each other.

The overlapping position of the inner segments 21 and the mesh grid can be chosen in many ways. In one embodiment, the hollow section extends to the proximal end of the first sheath 11; the distal end of the mesh extends into the first sheath 11. Specifically, in one embodiment, the distance between the inner segment 21 and the proximal end surface of the first sheath 11 is 0-10 mm.

In another embodiment, as shown in fig. 4, the proximal side of the first sheath 11 is the second sheath 12, the hollow section extends into the second sheath 12, and the distal end of the mesh grid extends into the second sheath 12. Specifically, the first sheath 11 has a hardness of 55D, and the second sheath 12 has a hardness of 72D.

In one embodiment, as shown in fig. 1 and 6, the electric knife further comprises an operating handle 5 connected to the proximal end of the tube 1 and a lead wire 6 for delivering energy to the electrode 2.

The operating handle 5 is provided with a first channel 51 and a second channel 52 therein, and both ends of the first channel 51 are respectively opened outside the operating handle 5 and respectively form a far end interface 53 and a near end interface 54. One end of the second passage 52 is communicated with the first passage 51, and the other end of the second passage 52 is opened outside the operating handle 5; the tube body 1 penetrates the first passage 51.

The far end of the lead 6 is electrically connected with the electrode 2, the middle section of the lead 6 is fixedly embedded in the pipe wall of the pipe body 1, and the near end of the lead 6 penetrates out of the pipe wall and then is connected with an external power supply through the second channel 52.

Specifically, in one embodiment, the operating handle 5 is two half shells that are fastened to each other in a radial direction of the pipe body 1. The distal end of the first passage 51 (i.e., the distal port 53) communicates with the proximal end of the tube body 1. The proximal end of the first channel 51 (i.e., the proximal port 54) is connected to a motive device for driving the flow of medium in the body, such as a vacuum pump via the luer 8, and the distal end of the electrode 2 serves as a fluid passage port. The proximal end of the lead 6 is connected to the banana connector 7 in the second channel 52 and to an external power source via the banana connector 7.

For ease of processing, in one embodiment, as shown in fig. 5, the wire 6 is coated with an insulating varnish 61; in the pipe wall of body 1, wire 6, woven mesh, built-in section 21 are two liang of insulating, should have obvious transition region between the tolerance temperature of insulated paint 61 and the softening temperature of body 1, can not take place local electrical contact when making the three fixed through the hot melt mode. To reduce the influence of the ribbon structure on the detection, the distal end of the lead wire 6 is electrically connected to the distal side of the ribbon structure.

The lead wire 6 is connected to the electrode 2 and is typically fixed by welding, and the lead wire 6 may be located on the outer circumferential surface of the electrode 2 relative to the electrode 2, and in another embodiment, the lead wire 6 may extend radially from the outer side to the inner circumferential surface of the electrode 2 and be electrically connected to the electrode 2.

The present application further provides an electrotome system comprising the electrotome in the above embodiment, a generator for supplying power to the electrotome, and a controller for controlling the generator to release power, wherein the controller comprises a processor and a memory, a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: and acquiring impedance information of a working loop of the electrode 2, and sending corresponding radio frequency energy to the electrode 2 according to the impedance information.

In one embodiment, as shown in FIG. 7, the distal end of the external segment 22 has a sharpened tip 24, such that the sharpened tip 24 reduces the resistance of the distal end of the electrode 2 to penetrating into tissue, thereby facilitating the acquisition of a sample of diseased tissue for testing. Specifically, the distal end of the sharp point part 24 is provided with a puncture inclined plane 25, and the included angle between the puncture inclined plane 25 and the axial direction of the tube body 1 is 20-60 degrees.

The tip cutting part 24 is arranged at the far end of the electrode 2, so that an operator can conveniently master the accurate information of the lesion tissue. In one aspect, prior to delivery of the electrical discharge ablation, the tissue can be removed through the sharpened portion 24 and the lesion in the tissue detected, providing guidance on the ablation treatment to be delivered, such as providing a reference for ablation time and power. On the other hand, the cutting tip 24 may be used to perform the electric discharge ablation on the lesion tissue, and after the ablation is finished, the cutting tip 24 is still used to take out the tissue sample from the original ablation site for the secondary detection, so as to determine whether the ablation is sufficient.

In particular, the sampling operation may be accomplished through the distal end of the tube 1. The detection step and the treatment step are combined through the sharpened portion 24, and tedious repeated positioning is omitted. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The electrotome comprises a tube body and an electrode which are connected with each other, wherein the tube body is provided with a far end and a near end which are opposite to each other, the electrotome is characterized in that the tube body comprises a plurality of sections of sheath tubes from the near end to the far end, the elasticity modulus of each section of sheath tube is gradually reduced, the section of sheath tube positioned at the far end is a first sheath tube, the electrode comprises an internal section which is fixedly embedded in the first sheath tube and an external section which extends out of the first sheath tube, the electrode discharges through the external section, and the internal section is provided with a hollow area which is deformed to adapt to the bending of the electrode;

and smoke exhaust holes are formed in the side wall of the pipe body, which is adjacent to the far end part, and the positions of the smoke exhaust holes correspond to the positions of the hollowed-out areas.

2. The electrotome according to claim 1, wherein the electrode is of tubular construction.

3. The electrotome according to claim 1, wherein the portion corresponding to the hollowed-out area is a hollowed-out section, the hollowed-out section is of a spiral band structure, and a gap between adjacent circles of the spiral band is used as the hollowed-out area; the ribbon has a width of M1, and the gap width between adjacent turns of the ribbon is M2, and satisfies M2>0.5 × M1.

4. The electrotome according to claim 1, wherein the part corresponding to the hollowed-out area is a hollowed-out section, and the length of the hollowed-out section is 5-8 cm.

5. The electrotome according to claim 1, wherein the portion corresponding to the hollow-out area is a hollow-out section, and the hollow-out section is fixed in the pipe wall of the pipe body in a hot melting manner and is completely wrapped by the pipe wall.

6. The electrotome according to claim 1, further comprising a discharge head closing the distal opening of the electrode, the discharge head comprising, in order from the proximal end to the distal end:

the connecting section is connected to the far-end part of the external section;

7. The electrotome according to claim 1, wherein a mesh grid is embedded in the tube, and the built-in section and the mesh grid are overlapped in axial position.

8. The electrotome according to claim 1 further comprising an operating handle connected to the proximal end of the tubular body and a lead for delivering energy to the electrode;

9. The electrotome according to claim 1, wherein the distal end of the outer section has a sharpened portion.