Ablation catheter capable of achieving accurate conveying of electrode

Abstract

The utility model belongs to the technical field of energy ablation, and provides an ablation catheter for realizing accurate electrode delivery, which mainly comprises a delivery outer tube provided with a first channel penetrating through two ends of the delivery outer tube; the conveying inner pipe is provided with a second channel penetrating through the two ends of the conveying inner pipe, and the conveying inner pipe is movably inserted into the first cavity channel of the conveying outer pipe; the ablation electrode is arranged at one end of the conveying inner tube, the ablation electrode is fixedly connected with the conveying inner tube, the ablation electrode is of an expandable structure, when the ablation electrode is in a closed state, the ablation electrode can be contracted in the conveying outer tube, and when the ablation electrode is in an expanded state, the ablation electrode extends out of the conveying outer tube; the control handle is respectively connected with the conveying outer tube and the conveying inner tube, and the relative movement of the conveying inner tube and the conveying outer tube is realized through the control handle, so that the ablation electrode shrinks or extends out of the conveying outer tube. By arranging the self-expanding ablation electrode, the adaptability of the ablation electrode to cavities of different sizes of the human body is enhanced, complex control is not needed, the structure is simple, and operation is easy.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy ablation, and in particular relates to an ablation catheter for realizing precise electrode delivery. Background Art

[0002] In recent years, with the continuous development of energy ablation technology, energy ablation has been applied to the treatment of diseases in human cavities. Energy ablation technology is to apply instantaneous energy to the target location and generate local high energy. The local high energy is higher than the threshold, which can destroy the structure of the site to be ablated, and this destruction is irreversible.

[0003] Existing ablation products have a single structure and the size of the ablation electrodes is fixed, which cannot adapt to the complex cavity environment of the human body. During the operation, consumables need to be replaced repeatedly to meet the surgical treatment of cavities with different inner diameters of the human body, making the entire operation process more cumbersome. Summary of the invention

[0004] The present invention provides an ablation catheter that realizes precise electrode delivery, which can accurately deliver the ablation electrode to the lesion location, and the ablation electrode can expand adaptively and has sufficient supporting force to improve the ablation effect to meet the needs of cell ablation in different natural cavities of the human body. There is no need for the operator to repeatedly replace consumables, which shortens the operation time and provides patients with a better treatment experience.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] An ablation catheter for achieving precise electrode delivery, comprising:

[0007] The outer conveying tube is provided with a first passage penetrating both ends thereof;

[0008] The inner conveying tube is provided with a second passage penetrating through both ends thereof, and the inner conveying tube is movably inserted into the first passage of the outer conveying tube;

[0009] an ablation electrode, disposed at one end of the inner delivery tube, the ablation electrode being fixedly connected to the inner delivery tube, wherein the ablation electrode is an expandable structure, and when the ablation electrode is in a closed state, it can be retracted into the outer delivery tube, and when the ablation electrode is in an expanded state, the ablation electrode extends out of the outer delivery tube;

[0010] A control handle is respectively connected to the outer delivery tube and the inner delivery tube, and the control handle includes a fixed outer shell, the outer shell is provided with a third channel and a first through groove connected to the third channel, the third channel is provided with a first slider that can move axially relative to the fixed outer shell, the first slider is connected to the outer delivery tube, and the first slider is provided with a push rod, one end of the push rod extends out through the first through groove and connected to the fixed outer shell.

[0011] In some embodiments, the ablation electrode is an expandable basket woven structure made of a memory alloy. When the ablation electrode is received in the outer delivery tube, the ablation electrode is in a closed state. When the ablation electrode extends out of the outer delivery tube, the ablation electrode returns to an expanded basket woven structure.

[0012] In some embodiments, the end of the ablation electrode connected to the inner tube is provided with a preset taper, and the tip of the preset taper is arranged toward a side of the inner delivery tube.

[0013] In some embodiments, the end of the ablation electrode away from the inner delivery tube is an open structure, and a cap is provided at one end of the open structure of the ablation electrode.

[0014] In some embodiments, the first sliding block is provided with a coaxially arranged first through hole and a first threaded hole, the aperture of the first threaded hole is larger than the aperture of the first through hole, a first fixed conical surface is provided at one end of the first through hole close to the first threaded hole, and the first threaded hole is provided with a matching first fixed sleeve, and one end of the first fixed sleeve is matched with the first fixed conical surface.

[0015] In some embodiments, a first external thread is disposed at one end of the fixed housing close to the ablation electrode, and a matching first locking nut is disposed on the first external thread.

[0016] In some embodiments, a section of the first external thread of the fixed housing is provided with a notch for expansion.

[0017] In some embodiments, a stepped claw hook is provided at one end of the fixed housing close to the ablation electrode.

[0018] In some embodiments, the control handle also includes a spiral rod having a second external thread, the inner wall of the third channel of the fixed shell having a matching second internal thread, and the inner conveying tube is connected to the spiral rod, wherein the inner conveying tube can rotate relative to the spiral rod.

[0019] In some embodiments, the spiral rod is provided with a fourth through channel, and a first sliding rod is provided in the fourth channel of the spiral rod, wherein the first sliding rod can rotate relative to the spiral rod, and the first sliding rod moves synchronously with the spiral rod in its own axial direction in the axial direction, and the conveying inner tube is rotationally connected to the spiral rod through the first sliding rod, and a first limiting structure is provided between the first sliding rod and the fixed outer shell to enable the first sliding rod to move along the axial direction of the fixed outer shell.

[0020] In some embodiments, a first abutment boss is provided at one end of the first sliding rod, and a second abutment boss is provided at the other end of the first sliding rod, the outer diameter of the first abutment boss and the outer diameter of the second abutment boss are both larger than the inner diameter of the fourth channel, and the first abutment boss and the second abutment boss can abut the spiral rod so that the first sliding rod and the spiral rod maintain synchronous movement in the axial direction.

[0021] In some embodiments, the first limiting structure includes a first limiting groove provided on the inner wall of the fixed housing and a first limiting boss provided on the first abutting boss, or,

[0022] A first limiting groove is provided on the first abutting boss and a first limiting boss is provided on the inner wall of the fixed shell.

[0023] The first limiting boss and the first limiting groove are adapted to each other, the first limiting boss is movably engaged in the first limiting groove, and the first limiting groove is arranged parallel to the axis of the fixed housing.

[0024] In some embodiments, the second abutting boss is detachably connected to the first sliding rod.

[0025] In some embodiments, a fifth channel is provided on the first sliding bar, the fifth channel runs through both ends of the first sliding bar, and the fifth channel is communicated with the second channel of the inner conveying tube.

[0026] In some embodiments, a first wire is further included, one end of which is electrically connected to the ablation electrode through the fifth channel and the second channel.

[0027] In some embodiments, a rotation knob is provided at one end of the spiral rod away from the fixed housing.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present application provides an outer delivery tube and an inner delivery tube that can move axially relative to each other, and provides an expandable ablation electrode at one end of the inner delivery tube, which can adapt to human cavities of different diameters so that the ablation electrode is close to the lesion in the human cavity to achieve precise treatment.

[0030] When the ablation electrode is not delivered to the target position, the ablation electrode can be stored in the outer tube for delivery, so as to avoid the ablation electrode from damaging the inner wall of the human body cavity during the delivery process;

[0031] Combined with the control handle, with the assistance of the endoscope, the ablation electrode can be accurately delivered to the lesion position, and the ablation electrode position is fixed;

[0032] At the same time, combined with the first locking nut on the fixed housing, the control handle can be fixed on the jaws of the endoscope without the need for assistance from additional staff.

[0033] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a stereoscopic diagram of the overall assembly of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0035] Figure 2 A schematic diagram of the connection structure of an ablation electrode of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0036] Figure 3 It is a cross-sectional view of the assembly structure of an outer delivery tube, an inner delivery tube and a first guide wire of an ablation catheter for realizing precise electrode delivery of the present invention;

[0037] Figure 4 It is a schematic diagram of the three-dimensional structure of a fixed shell of an ablation catheter for realizing precise electrode delivery according to the present invention;

[0038] Figure 5 A radial cross-sectional view of a fixed housing of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0039] Figure 6 An axial cross-sectional view of a fixed housing of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0040] Figure 7 An exploded view of a first slider and a first fixing sleeve of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0041] Figure 8 It is a schematic diagram of the assembly structure of a first slider and a first fixing sleeve of an ablation catheter for realizing precise electrode delivery according to the present invention;

[0042] Fig. 9 It is an axial cross-sectional view of the assembly of a spiral rod and a first sliding rod of an ablation catheter for realizing precise electrode delivery according to the present invention;

[0043] Fig.10 A three-dimensional diagram of a spiral rod of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0044] Fig.11 An axial cross-sectional view of a spiral rod of an ablation catheter for achieving precise electrode delivery according to the present invention;

[0045] Fig.12It is a schematic diagram of the three-dimensional structure of a first sliding rod of an ablation catheter for realizing precise electrode delivery according to the present invention;

[0046] Fig.13 It is an axial cross-sectional view of a first sliding rod of an ablation catheter for realizing precise electrode delivery according to the present invention. DETAILED DESCRIPTION

[0047] The present application is further described in detail below in conjunction with specific drawings. In the description of this embodiment, unless otherwise specified, the terms "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the present application must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0048] like Figure 1-3 As shown, an ablation catheter for realizing precise electrode delivery provided by the present invention mainly comprises an outer delivery tube 2, an inner delivery tube 4, an ablation electrode 1 and a control handle 3.

[0049] The outer delivery tube 2 is provided with a first channel 21 passing through both ends. The outer delivery tube 2 is an insulating conduit, and has certain flexibility and guidance to adapt to the complex and curved cavities of the human body, and can deliver the ablation electrode 1 to the lesion through the working channel of the endoscope;

[0050] The structure of the inner delivery tube 4 is similar to that of the outer delivery tube 2, both of which are conduits with insulating structures. The inner delivery tube 4 also has a second channel 41 that passes through both ends of the inner delivery tube 4. The inner delivery tube 4 is arranged in the first channel 21 of the outer delivery tube 2, and the outer delivery tube 2 and the inner delivery tube 4 can move relative to each other in the axial direction.

[0051] The ablation electrode 1 is arranged at one end of the inner transport tube 4. The ablation electrode 1 is fixedly connected to the inner transport tube 4 and can move synchronously with the inner transport tube 4. It should be particularly noted that the ablation electrode 1 is an expandable structure. When the ablation electrode 1 is received in the first channel 21 of the outer transport tube 2, the ablation electrode 1 is in a contracted state. When the inner transport tube 4 moves axially relative to the outer transport tube 2, the ablation electrode 1 will be brought out of the first channel 21 of the outer transport tube 2 by the inner transport tube 3, and the ablation electrode 1 is self-expanding into an expanded structure and maintains the expanded state. Preferably, in this embodiment, the ablation electrode 1 adopts a basket weaving structure. When the ablation electrode 1 is expanded, it is a cylindrical structure, so that the ablation electrode 1 has a higher fit with the inner wall of the human body cavity. Optionally, the ablation electrode 1 can also be configured as an active expansion or contraction structure, and a traction rope needs to be added to connect the other end of the ablation electrode 1, and the two ends of the ablation electrode are actively controlled to disperse or gather to achieve the contraction or expansion of the ablation electrode 1. At this time, the outer transport tube 2 only plays a storage role. During the expansion or contraction of the ablation electrode 1, there is no direct force between the outer transport tube 2 and the ablation electrode 1;

[0052] The control handle 3 is used to control the ablation electrode 1 to extend or retract into the first channel 21 of the outer delivery tube 2. The control handle 3 is respectively connected to the outer delivery tube 2 and the inner delivery tube 4. The outer delivery tube 2 or the inner delivery tube 4 is controlled to move by the control handle 3, thereby achieving the ablation electrode 1 extending out of the first channel 21 for expansion.

[0053] In the present application, the ablation electrode 1 is arranged to be a self-expanding structure, which can be accommodated in the outer delivery tube 2. When the ablation catheter is moved to the target position with the help of an endoscope, the relative movement between the outer delivery tube 2 and the inner delivery tube 4 is controlled by the control handle 3, and the ablation electrode 1 is extended out of the first channel 21 and self-expanded to fit the lesion in the human cavity for ablation, thereby achieving a good adhesion effect and realizing the purpose of precise ablation.

[0054] In one embodiment, the ablation electrode 1 is a basket weaving structure made of memory metal. Specifically, in this embodiment, the ablation electrode 1 is woven with memory metal wire. According to the ablation requirements, the expansion state of the ablation electrode is preset in advance. When the ablation electrode 1 is received in the outer delivery tube 2, it is contracted into a relatively small columnar structure due to the radial extrusion force of the outer delivery tube 2. When the ablation electrode 1 is separated from the outer delivery tube, due to the material characteristics of the memory metal, it self-expands and recovers to the preset expansion state without external force constraints to abut against the human body cavity. In this embodiment, the memory metal is nickel-titanium alloy, or titanium-chromium alloy, etc. By using memory metal wire for weaving, there is no need to add an additional control structure to control the opening and closing of the ablation electrode 1. The structure is simple and easy for the operator to operate. By adopting the ablation electrode 1 with a self-expanding structure, the adaptability of the electrode in the tissue cavity is greatly improved.

[0055] In one embodiment, one end of the ablation electrode 1 is provided with a preset taper, and the tip of the preset taper faces one side of the inner delivery tube. Figure 2 As shown, the ablation electrode 1 is divided into a pointed cone section 11 and a resting section 12, wherein the pointed cone section 11 is mainly used for guiding during the storage process of the ablation electrode 1. When the ablation electrode 1 needs to be stored in the first cavity 21, the inclined surface of the pointed cone section 11 guides the storage process of the ablation electrode 1, so that the resistance is smaller and the storage process is smoother. Optionally, the inclined surface of the pointed cone section 11 can also be set to an arc surface structure or a combination of an inclined surface and an arc surface. The pointed cone section 11 gathers and fixes the braided wire of the ablation electrode to one end of the inner delivery tube by setting a fixing ring. In this embodiment, the resting section 12 is a cylindrical thin-walled structure. Since the human body cavity is a columnar structure, the ablation electrode 1 can be more easily fitted with the human body cavity, thereby improving the treatment effect.

[0056] Furthermore, one end of the non-conical structure of the ablation electrode 1 is an open structure. Since the actual ablation site is the contact section 12, in order to simplify the structure and facilitate the storage of the ablation electrode 1, the non-pointed end of the ablation electrode 1 is set to an open structure. Since the ablation electrode 1 is woven with multiple braided wires, both ends of the ablation electrode 1 have a burr structure. In order to avoid the burr structure from damaging the inner wall of the human cavity when moving in the human cavity, a cap 13 is set at the non-pointed end of the ablation electrode 1 to protect the burr structure, thereby reducing the damage to the human cavity during the movement of the ablation electrode 1.

[0057] In one embodiment, Figure 4-6 As shown, the control handle 3 includes a fixed housing 31, a third channel 311 and a first through slot 312 are provided on the fixed housing 31, a first slider 32 is provided in the third channel 311 of the fixed housing 31, the first slider 32 can move axially along the fixed housing 31, the first slider 32 is fixedly connected with the outer delivery tube 2, and drives the outer delivery tube 2 to move axially, a push rod 321 is provided on the first slider 32, one end of the push rod 321 extends to the outside of the fixed housing 31 through the first through slot 312, so that the operator can push the first slider 32. Specifically, the outer shape structure of the first slider 32 is adapted to the third channel 311, the width of the first through slot 312 is adapted to the width of the push rod 321, and the first through slot 312 allows the push rod 321 to extend out of the fixed housing 31 and move axially along the first through slot 312, and the first through slot 312 also plays a role in limiting the push rod 321, so as to prevent the push rod 321 from swinging in the radial direction, thereby preventing the first slider 32 from driving the outer delivery tube 2 to swing. It should be noted that the direction of the first through slot 312 is consistent with that of the third channel 311, and both are parallel to the central axis of the fixed housing 31. The product is released by pushing the push rod, which reduces the shaking of the ablation catheter during operation and may cause deviation of the treatment position.

[0058] Optionally, a limiting structure may be provided between the fixed housing 31 and the first sliding block 32 to prevent the first sliding block 32 from swinging in the radial direction of the fixed housing 31 .

[0059] In one embodiment, Figure 7-8 As shown, in order to facilitate the assembly between the outer tube 2 and the first slider 32, a first through hole 323 and a first threaded hole 322 are provided on the first slider 32, the aperture of the first threaded hole 322 is larger than the diameter of the first through hole 323, and the first through hole 323 and the first threaded hole 322 are coaxially arranged, a first fixed cone 324 is provided at one end of the first through hole 323 close to the first threaded hole 322, an adapted first fixed sleeve 33 is provided on the first threaded hole 322, a first threaded column 331 is provided on the first fixed sleeve, the first fixed sleeve 33 is detachably arranged on the first slider 32 through threaded matching, a fixed cone 332 is provided at one end of the first fixed sleeve 33, the first fixed cone 332 is adapted to the first fixed cone 324, one end of the outer tube 2 is squeezed and fixed on the first fixed cone 324 through the first fixed cone 332 of the first fixed sleeve 33, thereby realizing a detachable connection between the outer tube 2 and the first slider 32, so that the operator can replace the outer tube 2 of different lengths according to surgical requirements. Optionally, the outer transport tube 2 may also be non-detachably connected to the first slider 32 .

[0060] Furthermore, if Figure 7 As shown, the first fixing sleeve 33 is provided with a plurality of planes for fixing, so that the first fixing sleeve 33 and the first sliding block 32 can be locked and fixed by means of tools.

[0061] Furthermore, a second through hole 333 is provided on the first fixing sleeve 33 , and the second through hole 333 is coaxially arranged with the first through hole 323 , wherein one end of the inner conveying tube 4 passes through the first through hole 323 and the second through hole 333 to be connected with the spiral rod 34 .

[0062] In one embodiment, Figure 4-6 As shown, since the ablation catheter in this embodiment needs to be transported with the help of the working channel of the endoscope, in order to facilitate the fixing of the ablation catheter on the clamp opening of the endoscope, a first external thread 316 is provided at one end of the fixed shell 31 close to the ablation electrode 1, and a first locking nut 319 is provided on the first external thread 316. The first locking nut 319 is used to reduce the third channel 311 of the first external thread 316 section, so that the fixed shell 31 is fixed to the clamp opening of the endoscope. By setting the first locking nut 319 to fix the fixed shell 31, the risk of the ablation catheter being bent and unable to be used due to its own weight is effectively reduced, while reducing the inconvenience of requiring multiple people to operate and reducing the assistance of personnel during non-treatment periods.

[0063] Furthermore, in order to facilitate a more stable connection between the fixed housing 31 and the endoscope's forceps port, a plurality of notches 315 for expansion are provided at the first external thread 316 section of the fixed housing 31. In this embodiment, the notches 315 are provided along the axial direction of the fixed housing 31. There are four notches 315, which are symmetrically distributed on the fixed housing, and the notches 315 pass through the side wall of the fixed housing 31. By providing the notches 315, the portion of the fixed housing 31 provided with the first external thread 316 can be expanded. Furthermore, a transition section 317 is also provided at one side of the first external thread of the fixed housing 31. The transition section 317 is mainly used for placing the first locking nut 319 when the fixed housing 31 is connected.

[0064] Furthermore, if Figure 5 and Figure 6 As shown, a stepped claw hook 318 is provided at one end of the first external thread section 316 of the fixed housing 31 for clamping with the step of the endoscope's clamp opening. The third channel 311 of the first external thread section 316 is expanded by a plurality of notches 315 so that the stepped claw hook 318 can clamp with the step of the clamp opening. At the same time, the presence of the plurality of notches 315 can shrink the third channel 311 of the first external thread section 316, so that the inner wall of the fixed housing 31 abuts against the outer wall of the clamp opening and is locked by the first locking nut 319.

[0065] In one embodiment, Figure 6 as well as Figure 9-11 As shown, the control handle also includes a spiral rod 34, a second external thread 341 is provided on the spiral rod 34, and a matching second internal thread 314 is provided on the inner wall of the third channel 311 of the fixed housing 31, wherein the delivery inner tube 4 is connected to the spiral rod 34, and the delivery inner tube 4 is driven to move axially relative to the delivery outer tube 2 by rotating the spiral rod 34. It should be particularly noted that in order to avoid the rotation of the ablation electrode 1, the delivery inner tube 4 and the spiral rod 34 are movably connected, that is, the spiral rod 34 only drives the delivery inner tube 4 to move axially, and the delivery inner tube 4 does not follow the spiral rod 34 to rotate radially.

[0066] Further, such as Fig.11As shown, in order to realize the movable connection between the inner tube 4 and the screw rod 34, a fourth channel 343 is provided on the screw rod 34, which runs through both ends of the screw rod 34, and a first slide bar 35 is arranged in the fourth channel 343 of the screw rod 34, wherein the first slide bar 35 can rotate relative to the screw rod 34, and the first slide bar 35 moves synchronously with the screw rod 34 in its own axial direction, and the inner tube 4 is fixedly connected with the first slide bar 35, and the inner tube 4 is movably connected with the screw rod 34 through the first slide bar 35. Further, in order to prevent the first slide bar 35 from rotating with the screw rod 34, a first limiting structure is arranged between the first slide bar 35 and the fixed shell 31, so that the first slide bar 35 reciprocates along the axial direction of the fixed shell 31. Specifically, the shape of the fourth channel 343 is adapted to the shape of the first slide bar 35, the fourth channel 343 is a cylindrical structure, and the first slide bar 35 is also a cylindrical structure, so that the first slide bar 35 and the screw rod 34 can rotate relative to each other. Optionally, a bearing structure may be provided between the first slide bar 35 and the spiral rod 34 , so that the first slide bar 35 can rotate equivalent to the spiral rod 34 , and the first slide bar 35 and the spiral rod 34 can move synchronously in their own axial directions.

[0067] Furthermore, if Figure 12-13 As shown, in order to achieve synchronous movement between the first slide bar 35 and the spiral rod 34 and relative rotation between the first slide bar 35 and the spiral rod 34, a first abutment boss 351 is set at one end of the first slide bar 35, and a second abutment boss 352 is set at the other end of the first slide bar 35, wherein the outer diameter of the first abutment boss 351 and the outer diameter of the second abutment boss 352 are both larger than the inner diameter of the fourth channel 343, and the first abutment boss 351 and the second abutment boss 352 are both abutted against the spiral rod 34 to avoid relative movement of the first slide bar 35 and the spiral rod 34 in the axial direction, so that the first slide bar 35 and the spiral rod 34 maintain synchronous movement in the axial direction.

[0068] Further, the first limiting structure includes a first limiting groove 313 provided on the inner wall of the fixed housing 34 and a first limiting boss 3511 provided on the first abutting boss 351, the first limiting boss 3511 is adapted to the first limiting groove 313, and the first limiting boss 3511 is clamped in the first limiting groove 313, wherein the first limiting groove 313 is arranged parallel to the central axis of the fixed housing 31 to ensure that the first slide bar 35 moves linearly along its own axial direction. It can be understood that the structural shape and number of the first limiting groove 313 and the first limiting boss 3511 are not limited by the present invention, and the first limiting groove 313 and the first limiting boss 3511 can be the same as other shapes such as a matching triangle or ellipse, or the first limiting groove 313 and the first limiting boss 3511 are both provided with 1, 2, 3, etc.

[0069] As another variant implementation of this embodiment, the first limiting structure may also be a first limiting boss 3511 provided on the fixed housing 31 and a first limiting groove 313 provided on the first abutting boss 351 .

[0070] Further, in order to facilitate the assembly between the first slide bar 35 and the spiral rod 34, the first slide bar 35 and the spiral rod 34 are set to a detachable connection structure. Specifically, a detachable connection structure is set between the second abutting boss 352 and the first slide bar 35, a third external thread 353 is set at one end of the first slide bar 35, and a third internal thread 3521 is set on the second abutting boss 352, and the second abutting boss 352 is detachably connected with the first slide bar 35 through threaded matching. Optionally, the third internal thread 3521 can be set at one end of the first slide bar 35, and the third external thread 353 can be set on the second abutting boss 352, and the above-mentioned detachable connection can also be achieved. Optionally, a detachable clamping structure can also be set between the second abutting boss 352 and the first slide bar 35.

[0071] Furthermore, in order to make the structure more compact, Fig.11 As shown, a countersunk hole 344 is provided on the spiral rod 34, the diameter of the countersunk hole 344 is larger than the size of the second abutting boss 352, and the depth of the countersunk hole 344 can make the second abutting boss 352 partially or completely located in the spiral rod 34. A fixing plane for locking is provided on the second abutting boss 352.

[0072] In one embodiment, a fifth channel 354 is provided on the first slide bar 35 , and the fifth channel 354 runs through both ends of the first slide bar 35 , wherein the inner conveying tube 4 is fixedly connected to the first slide bar 35 , and the second channel 41 of the inner conveying tube 4 is connected to the fifth channel 354 .

[0073] In one embodiment, the ablation catheter also includes a first wire 5, one end of which is electrically connected to the ablation electrode 1 through the fifth channel 354 of the first sliding rod 35 and the second channel 41 of the inner conveying tube 4, and the other end of the first wire 5 is connected to an external energy generator through the second channel 41 and the fifth channel 354.

[0074] In one embodiment, a rotating knob 342 is provided at one end of the spiral rod 34 away from the fixed housing 31, so that the operator can rotate the spiral rod 34. By rotating the spiral rod 34, the ablation electrode 1 can be further extended, so that the ablation electrode 1 can be more accurately close to the target tissue under the endoscope working channel, making the ablation position more accurate. By providing the spiral rod 34, the difficulty of operation in the narrow natural cavity of the human body is effectively reduced. For scenes requiring continuous treatment, the spiral rod 34 can be rotated to accurately deliver the treatment product to the target position, reduce misoperation, and especially reduce the occurrence of repeated treatment.

[0075] The above is only a preferred embodiment of the present invention. It should be noted that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An ablation catheter for achieving precise electrode delivery, characterized in that: include: The outer conveying tube is provided with a first passage penetrating both ends thereof; The inner conveying tube is provided with a second passage penetrating through both ends thereof, and the inner conveying tube is movably inserted into the first passage of the outer conveying tube; an ablation electrode, disposed at one end of the inner delivery tube, the ablation electrode being fixedly connected to the inner delivery tube, wherein the ablation electrode is an expandable structure, and when the ablation electrode is in a closed state, it can be retracted into the outer delivery tube, and when the ablation electrode is in an expanded state, the ablation electrode extends out of the outer delivery tube; A control handle is respectively connected to the outer delivery tube and the inner delivery tube, and the control handle includes a fixed outer shell, the outer shell is provided with a third channel and a first through groove connected to the third channel, the third channel is provided with a first slider that can move axially relative to the fixed outer shell, the first slider is connected to the outer delivery tube, and the first slider is provided with a push rod, one end of the push rod extends out through the first through groove and connected to the fixed outer shell.

2. The ablation catheter for achieving precise electrode delivery according to claim 1, characterized in that: The ablation electrode is an expandable basket weave structure made of memory alloy. When the ablation electrode is received in the outer delivery tube, the ablation electrode is in a closed state. When the ablation electrode extends out of the outer delivery tube, the ablation electrode returns to an expanded basket weave structure.

3. The ablation catheter for achieving precise electrode delivery according to claim 2, characterized in that: One end of the ablation electrode connected to the inner tube is provided with a preset taper, and the tip of the preset taper is arranged toward one side of the inner delivery tube.

4. The ablation catheter for achieving precise electrode delivery according to claim 2, characterized in that: The end of the ablation electrode away from the inner delivery tube is an open structure, and a sealing head is arranged at one end of the open structure of the ablation electrode.

5. The ablation catheter for achieving precise electrode delivery according to claim 1, characterized in that: The first sliding block is provided with a coaxially arranged first through hole and a first threaded hole, the aperture of the first threaded hole is larger than the aperture of the first through hole, a first fixed conical surface is provided at one end of the first through hole close to the first threaded hole, and a matching first fixed sleeve is provided on the first threaded hole, and one end of the first fixed sleeve is matched with the first fixed conical surface.

6. The ablation catheter for achieving precise electrode delivery according to claim 1, characterized in that: A first external thread is arranged at one end of the fixed housing close to the ablation electrode, and a first adaptive locking nut is arranged on the first external thread.

7. The ablation catheter for achieving precise electrode delivery according to claim 6, characterized in that: A section of the first external thread of the fixed housing is provided with a notch for expansion.

8. The ablation catheter for achieving precise electrode delivery according to claim 7, characterized in that: A stepped claw hook is provided at one end of the fixed shell close to the ablation electrode.

9. The ablation catheter for achieving precise electrode delivery according to claim 1, characterized in that: The control handle also includes a spiral rod, which is provided with a second external thread. The inner wall of the third channel of the fixed shell is provided with an adaptable second internal thread. The conveying inner tube is connected to the spiral rod, wherein the conveying inner tube can rotate relative to the spiral rod.

10. The ablation catheter for achieving precise electrode delivery according to claim 9, characterized in that: The spiral rod is provided with a fourth channel therethrough, and a first sliding rod is provided in the fourth channel of the spiral rod, wherein the first sliding rod can rotate relative to the spiral rod, and the first sliding rod moves synchronously with the spiral rod in its own axial direction in the axial direction, and the conveying inner tube is rotationally connected to the spiral rod through the first sliding rod, and a first limiting structure is provided between the first sliding rod and the fixed outer shell to enable the first sliding rod to move along the axial direction of the fixed outer shell.

11. The ablation catheter for achieving precise electrode delivery according to claim 10, characterized in that: A first abutment boss is provided at one end of the first slide rod, and a second abutment boss is provided at the other end of the first slide rod. The outer diameter of the first abutment boss and the outer diameter of the second abutment boss are both larger than the inner diameter of the fourth channel. The first abutment boss and the second abutment boss can abut the spiral rod so that the first slide rod and the spiral rod maintain synchronous movement in the axial direction.

12. The ablation catheter for achieving precise electrode delivery according to claim 11, characterized in that: The first limiting structure includes a first limiting groove provided on the inner wall of the fixed housing and a first limiting boss provided on the first abutting boss, or, A first limiting groove is provided on the first abutting boss and a first limiting boss is provided on the inner wall of the fixed shell. The first limiting boss and the first limiting groove are adapted to each other, the first limiting boss is movably engaged in the first limiting groove, and the first limiting groove is arranged parallel to the axis of the fixed housing.

13. The ablation catheter for achieving precise electrode delivery according to claim 11, characterized in that: The second abutting boss is detachably connected to the first sliding rod.

14. The ablation catheter for achieving precise electrode delivery according to claim 10, characterized in that: The first sliding bar is provided with a fifth channel, the fifth channel runs through both ends of the first sliding bar, and the fifth channel is communicated with the second channel of the inner conveying tube.

15. The ablation catheter for achieving precise electrode delivery according to claim 14, characterized in that: It also includes a first wire, one end of which is electrically connected to the ablation electrode through the fifth channel and the second channel.

16. The ablation catheter for achieving precise electrode delivery according to claim 9, characterized in that: A rotating knob is provided at one end of the spiral rod away from the fixed housing.

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