Ablation catheter for adjusting ablation position
By designing an ablation catheter for adjusting the ablation position, using the relative movement of the insulated sleeve and push sheath to control the ablation length of the ablation electrode in real time, the problem of fixing the ablation electrode length in the prior art is solved, and more accurate ablation range control and protection of surrounding tissues are achieved.
Patent Information
- Application Number
- CN202421147378.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-23
AI Technical Summary
In the existing electroporation technology, the ablation length of the ablation electrode is fixed, making it difficult to match tumors of different sizes, resulting in the need to repeatedly move the ablation electrode when the tumor is larger, which increases the difficulty of the operation, or the ablation range is too large when the tumor is smaller, affecting surrounding healthy tissues.
An ablation catheter for adjusting the ablation position is designed, including a push sheath, ablation electrode, an insulated sleeve and a wire drawing. Through the relative movement between the insulating cannula and the push sheath, the ablation length of the ablation electrode is controlled in real time to adapt to tumors of different sizes.
The ablation length of the ablation electrode is controlled in real time during the operation, avoiding the problem of mismatch between the length of the ablation electrode and the tumor size, ensuring the accuracy of the ablation range, and reducing the impact on surrounding healthy tissues.
Smart Images
Figure CN222804338U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical pulse electroporation treatment, in particular to an ablation catheter used for adjusting an ablation position. Background Art
[0002] In the clinical treatment method of tumors using irreversible electroporation technology, electric pulses are used to ablate biological tissues. This is done by sending electric field pulses to the target cells, causing ions inside and outside the cells to move and gather on both sides of the outer membrane, causing a sharp change in the transmembrane potential. The cells undergo irreversible electroporation, breaking the balance inside and outside the cells and ultimately causing cell death.
[0003] During the treatment process, due to the inconsistency of tumor size, when the tumor size is larger than the effective ablation length of the ablation electrode, the ablation electrode needs to be moved so that the ablation area covers the tumor tissue in all directions. When the tumor tissue is smaller than the effective length of the ablation electrode, the effective length of the ablation electrode needs to be reduced to control the reduction of the ablation range. In the existing electroporation technology, the ablation length of the ablation electrode is fixed. If the ablation electrode is designed too small, when the tumor size is large, the ablation electrode needs to be moved repeatedly. When the ablation electrode is designed too large, when encountering a smaller tumor, the ablation range is larger, which will exceed the tumor size and affect the surrounding tissues. Therefore, during the operation, how to control the effective ablation range of the ablation electrode is a problem that technicians in this field urgently need to solve. Utility Model Content
[0004] The utility model provides an ablation catheter for adjusting the ablation position, which solves the problem in the above-mentioned background technology that when the tumor size does not match the ablation length of the ablation electrode, the ablation electrode is too short and the ablation electrode needs to be repeatedly moved for surgical treatment, which increases the difficulty of the operation and reduces the patient experience; or when the ablation electrode is too long, it affects the surrounding healthy tissues.
[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:
[0006] An ablation catheter for adjusting an ablation position, comprising:
[0007] A pushing sheath tube has a first through lumen;
[0008] an ablation electrode having a first end and a second end, wherein the ablation electrode separates the push sheath into relatively independent distal and proximal portions; the first end of the ablation electrode is connected to the proximal portion of the push sheath, and the second end of the ablation electrode is connected to the distal portion of the push sheath;
[0009] an insulating sleeve, sleeved on the outside of the pushing sheath, one end of the insulating sleeve being arranged close to the first end or the second end of the ablation electrode, the insulating sleeve and the pushing sheath being able to move relative to each other, and the moving direction is consistent with the axial direction of the pushing sheath; and
[0010] A drawing wire is arranged in the pushing sheath, the drawing wire is located in the first cavity, the insulating sleeve is arranged on the distal part of the pushing sheath, one end of the insulating sleeve is arranged close to the second end of the ablation electrode, the ablation electrode has a second cavity, and the drawing wire passes through the second cavity and is connected to the insulating sleeve.
[0011] In some embodiments, the length of the insulating sleeve is greater than the ablation length of the ablation electrode.
[0012] In some embodiments, a smooth guiding structure is provided at one end of the insulating sleeve away from the ablation electrode.
[0013] In some embodiments, the ablation electrode is a basket weave structure, the first end of the ablation electrode is embedded in the proximal portion of the push sheath, and the distal end of the ablation electrode is embedded in the distal portion of the push sheath.
[0014] In some embodiments, the push sheath includes an outer tube and an inner tube, a preset gap is provided between the outer tube and the inner tube, the ablation electrode is arranged in the preset gap, the first end of the ablation electrode extends to the proximal end of the push sheath away from the ablation electrode, and the second end of the ablation electrode extends to the distal end of the push sheath away from the ablation electrode.
[0015] In some embodiments, a handle is further included, wherein the handle has a grip and a push rod, one end of the push sheath is connected to the push rod, one end of the wire drawing is connected to the handle, and the grip and the push rod can move relative to each other in the axial direction of the push rod.
[0016] In one embodiment, the handle includes a horizontal grip rod and a first guide rod, the push rod is provided with a third cavity adapted to the first guide rod, and the first guide rod is movably disposed in the third cavity of the push rod.
[0017] In some embodiments, a first limiting structure is provided between the push rod and the handle, and the first limiting structure includes a first limiting groove provided on the first guide rod and a first limiting boss provided on the inner wall of the push rod, or a first limiting boss provided on the first guide rod and a first limiting groove provided on the inner wall of the push rod, and the first limiting boss is clamped on the first limiting groove to enable axial relative linear movement between the handle and the push rod.
[0018] In some embodiments, the push rod is provided with a first threaded hole, the first threaded hole is provided with a matching locking screw, and one end of the locking screw can be abutted against the handle through the first threaded hole.
[0019] In some embodiments, a feeding scale is provided on the first guide rod, and a size of the feeding scale is consistent with a length of the insulating sleeve covering the ablation electrode.
[0020] In some embodiments, it also includes a developing mark for displaying the ablation length, and the developing mark includes a first marking ring and a second marking ring, the first marking ring is arranged on the proximal part of the push sheath, and the first marking ring is located at the edge of the proximal part of the push sheath, and the second marking ring is arranged on the insulating sleeve, and the second marking ring is arranged close to the edge of the insulating sleeve.
[0021] In some embodiments, it further includes a power cord connected to the energy generator, the drawing wire has conductive properties, one end of the drawing wire is electrically connected to the power cord, and the other end of the drawing wire is electrically connected to the ablation electrode.
[0022] Compared with the prior art, the beneficial effects brought by the utility model are:
[0023] The present application sets an ablation electrode of a certain length at one end of the push sheath, sets an insulating sleeve of a certain length on the outside of the push sheath, and performs axial relative movement between the push sheath and the insulating sleeve, thereby achieving real-time control of the ablation length of the ablation electrode during the operation, avoiding the problem of mismatch between the ablation length of the ablation electrode and the tumor size, making the ablation range more accurate, and avoiding affecting the healthy tissue around the tumor.
[0024] 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
[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of an ablation catheter for adjusting the ablation position according to the utility model;
[0026] Figure 2 This is a schematic diagram of the initial position of an ablation catheter for adjusting the ablation position according to the utility model;
[0027] Figure 3 It is a schematic diagram of an insulating sleeve of an ablation catheter for adjusting an ablation position according to the utility model after adjustment;
[0028] Figure 4It is a three-dimensional structural schematic diagram of a handle of an ablation catheter for adjusting the ablation position according to the utility model;
[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of a push rod of an ablation catheter for adjusting the ablation position according to the utility model;
[0030] Figure 6 It is a cross-sectional view of a push rod of an ablation catheter for adjusting an ablation position according to the utility model;
[0031] Figure 7 The utility model is a schematic diagram of the assembly structure of an insulating sleeve and a pushing sheath of an ablation catheter for adjusting the ablation position.
[0032] Figure 8 for Figure 7 Enlarged view of point A in the middle;
[0033] Fig. 9 The utility model is a schematic diagram of another structural assembly of an ablation electrode of an ablation catheter for adjusting the ablation position. DETAILED DESCRIPTION
[0034] 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.
[0035] like Figure 1-3As shown, an ablation catheter for adjusting the ablation position provided by the utility model mainly includes a push sheath tube 200 , an insulating sleeve 300 and an ablation electrode 203 . The push sheath 200 is a long flexible tubular structure having a first cavity; the ablation electrode 203 is a tubular cylindrical structure having a first end and a second end. The ablation electrode 203 is embedded in the push sheath 200 to separate the push sheath 200 into two relatively independent parts, a proximal part 201 and a distal part 202. The first end of the ablation electrode 203 is connected to the proximal part 201 of the push sheath 200, and the second end of the ablation electrode 203 is connected to the distal part 202 of the push sheath 200; the insulating sleeve 300 is sleeved on the outside of the push sheath 200, and one end of the insulating sleeve 300 is arranged near the edge of the first end or the second end of the ablation electrode 203, wherein the insulating sleeve 300 can move axially relative to the push sheath 200, so that the insulating sleeve 300 controls the effective ablation length 2031 of the ablation electrode 203 leaking out to meet the requirements of different surgical environments. For example, in this embodiment, the ablation catheter is used to treat human cavity tumors. When the size of the tumor outside the cavity or inside the cavity is large, the push sheath 200 is moved to gradually decompose and ablate it. When the size of the tumor is small, since the effective ablation length 2031 of the ablation electrode 203 is large and fixed, much larger than the tumor size, the insulating sheath 300 and the push sheath 200 are relatively moved to allow the insulating sheath 300 to partially insulate the effective ablation length 2031 of the ablation electrode 203, thereby reducing the effective ablation length 2031 of the ablation electrode 203 to match the size of the tumor to be ablated.
[0036] The present application achieves adjustment of the ablation length 2031 of the ablation electrode 203 through relative movement of the insulating sleeve 300 and the push sheath 200, thereby eliminating the need to repeatedly replace or move the ablation catheter, thereby providing patients with a better treatment experience. At the same time, the ablation range of the ablation electrode 203 is accurately controlled to avoid an excessively large ablation range that would affect surrounding healthy tissues.
[0037] In one embodiment, the insulating sleeve 300 is sleeved on the distal portion 202 of the push sheath 200, and one end of the insulating sleeve 300 is arranged close to the second end of the ablation electrode 203. A third cavity 303 is provided on the insulating sleeve 300, and its structure is adapted to the shape of the push sheath 200. In order to control the relative movement between the push sheath 200 and the insulating sleeve 300 arranged on the distal portion 202, the ablation catheter also includes a wire drawing 301. The wire drawing 301 is arranged in the first cavity of the push sheath 200, and a second cavity is arranged on the ablation electrode 203. One end of the wire drawing 301 passes through the second cavity of the ablation electrode 203 and is fixedly connected to the end of the insulating sleeve 300 away from the ablation electrode 203. As another variation of this embodiment, the insulating sleeve 300 can also be set on the proximal portion 201 of the push sheath 200, that is, one end of the insulating sleeve 300 is set close to the first end of the ablation electrode 203. In this case, there is no need to draw the wire 301 to connect with the insulating sleeve 300. It is only necessary to control the end of the insulating sleeve 300 away from the ablation electrode 203 or the proximal portion 201 of the push sheath 200 away from the ablation electrode 203 to make relative movement between the push sheath 200 and the insulating sleeve 300 to achieve control of the effective ablation length 2031 of the ablation electrode 203.
[0038] In one embodiment, Figure 7 and Fig. 9 As shown, the length of the insulating sleeve 300 is greater than the effective ablation length 2031 of the ablation electrode 203, so that the exposed part of the ablation electrode 203 can be fully covered, so as to ablate smaller tumor tissues. At the same time, since the distal part 202 of the push sheath 200 has a certain length for guidance, the insulating sleeve 300 needs a certain length of clearance space, so that the insulating sleeve 300 can cover the exposed ablation electrode 203 in place. In this embodiment, the most optimal implementation method, the length of the third lumen 303 of the insulating sleeve 300 should be greater than or equal to the sum of the ablation length 2031 of the ablation electrode 203 and the length of the distal part 202 of the push sheath 200.
[0039] Furthermore, the ablation catheter is used for ablation in a human cavity. Since the tissue in the human cavity is relatively fragile, a smooth guide structure 302 is provided at one end of the insulating sleeve 300 away from the ablation electrode 203. In this embodiment, the smooth guide structure 302 is composed of a conical surface and an arc surface structure, which can effectively prevent the ablation catheter from damaging the human tissue when it moves in the human cavity before being transported to the destination. Optionally, the smooth guide structure 302 can be a hemispherical structure, a chamfered structure, or a rounded structure.
[0040] In one embodiment, since the ablation catheter needs to enter a human cavity, such as the intestine, urethra, lung trachea, etc., the push sheath 200 needs to have a certain degree of flexibility in order to better move in the human cavity, such as Figure 7 As shown, the push sheath 200 includes an outer tube and an inner tube, wherein a gap is provided between the outer tube and the inner tube, and the ablation electrode 203 is a basket weave structure, which is composed of a plurality of conductive metal braided wires. The first end of the ablation electrode 203 with the basket structure extends to the proximal portion 201 of the push sheath 200 away from the end of the ablation electrode 203, and the second end of the ablation electrode 203 with the basket structure extends to the distal portion 202 of the push sheath 200 away from the end of the ablation electrode 203. While performing conductive ablation, the ablation electrode 203 with the basket structure also provides a certain support to the push sheath 200 composed of the inner tube and the outer tube. Optionally, the ablation electrode 203 with the basket structure can also be embedded only in a portion of the push sheath 200, for example, Fig. 9 As shown, the first end of the ablation electrode 203 is embedded in the proximal part 201 close to the ablation electrode 203, and the second end of the ablation electrode 203 is embedded in the distal part 202 close to one end of the ablation electrode 203; at this time, the wire drawing 301 is made of conductive material or a separate wire is set to transmit energy to the ablation electrode 203 of the basket structure through the first cavity.
[0041] In one embodiment, Figure 4-6 As shown, in order to achieve relative movement between the insulating sleeve 300 and the push sheath 200, the ablation catheter also includes a handle 100, and the handle 100 includes a grip 101 and a push rod 102, and the grip 101 and the push rod 102 can move relatively; in this embodiment, one end of the push sheath 200 is fixedly connected to the push rod 102, and a first fixing hole 1024 is set at one end of the push rod 102 to fix the push sheath 200, and one end of the wire drawing 301 is fixedly connected to the grip 101, and a second fixing hole 10121 is set on the grip to fix the wire drawing 301. Through the relative movement of the grip 101 and the push rod 102, a relative displacement is generated between the push sheath 200 and the insulating sleeve 300, so as to achieve the control of the ablation length 2031 of the ablation electrode 203.
[0042] Further, the grip 101 includes a horizontal grip rod 1011 and a first guide rod 1012, and the push rod 102 is provided with a third cavity 1021 adapted to the shape of the first guide rod 1012, and the first guide rod 1012 is movably inserted in the third cavity 1021 of the push rod 102. In this embodiment, the third cavity 1021 and the first guide rod 1012 are both cylindrical structures, so that the first guide rod 1012 has less obstacles when moving in the third cavity 1021. Optionally, the third cavity 1021 can also be provided on the grip 101, the first guide rod 1012 can be provided on the push rod 102, a through slide groove can be provided on the grip 101, and a push button can be provided to pass through the slide groove and connect with the first guide rod 1012 of the push rod 102, so as to realize the axial relative movement of the grip 101 and the push rod 102.
[0043] In one embodiment, Figure 4 As shown, in order to facilitate the control of the insulating sleeve 300 in the initial position, the diameter of the first guide rod 1012 is smaller than the diameter of the horizontal grip rod 1011, that is, the horizontal grip rod 1011 is a step structure relative to the first guide rod 1012, wherein a first abutting surface 10111 is provided on the horizontal grip rod 1011, and when one end of the push rod 102 abuts against the first abutting surface 10111, at this time, the position of the insulating sleeve 300 is in the initial position, that is, the ablation length 2031 of the ablation electrode 203 is the maximum. In this embodiment, the first abutting surface 10111 is a plane, and the side of the push rod 102 close to the first abutting surface 10111 is also a plane structure. It can be understood that the shape and structure of the first abutting surface 10111 are not limited, and it is only necessary to position the push rod 102, so that the operator can quickly understand that the insulating sleeve 300 is in the initial position.
[0044] In one embodiment, Figure 4 and Figure 5As shown, in order to prevent the handle 101 and the push rod 102 from rotating during the adjustment process and to prevent them from driving the push sheath 200 or the wire drawing 301 and the insulating sleeve 300 to rotate in the human body cavity, a first limiting structure is provided between the push rod 102 and the handle 101. In this embodiment, the first limiting structure includes a first limiting groove 10122 provided on the first guide rod 1012 and a first limiting boss 1022 provided on the inner wall of the push rod 102, wherein the first limiting groove 10122 is adapted to the first limiting boss 1022, and the first limiting groove 10122 and the first limiting boss 1022 are provided in parallel with their own axial direction, so that the handle 101 and the push rod 102 can perform axial relative linear movement. The length of the first limiting groove 10122 and the first limiting boss 1022 is at least greater than or equal to the ablation length 2031 of the ablation electrode 203. In this embodiment, the first limiting groove 10122 is in an arc shape, and the first limiting boss 1022 is an arc boss adapted thereto. Optionally, the first limiting groove 10122 can also be in other shapes such as a triangle or a quadrilateral, and the first limiting boss 1022 can be adapted thereto. As another variant implementation of this embodiment, the third cavity 1021 can be in an irregular shape, such as an ellipse, a triangle or a quadrilateral, and the first guide rod 1012 can be adapted thereto, and the rotation between the handle 101 and the push rod 102 can also be avoided. Optionally, as another variant of this embodiment, the first limiting groove 10122 can be set on the inner wall of the push rod 102, and the first limiting boss 1022 can be set on the first guide rod 1012, which can also achieve the axial limiting effect of the handle 100.
[0045] Furthermore, if Figure 1 and Figure 5 As shown, a first threaded hole 1023 is provided on the side wall of the push rod 102, and a matching locking screw 1022 is provided on the first threaded hole 1023. One end of the locking screw 1022 can be abutted against the outer wall of the first guide rod 1012 through the first threaded hole 1023. By rotating the locking screw 1022, one end of the locking screw 1022 close to the first guide rod 1012 is pressed against or away from the outer wall of the first guide rod 1012, thereby achieving position locking of the push rod 102, fixing the ablation length 2031 of the ablation electrode 203 or adjusting the ablation length 2031 of the ablation electrode 203 to the size required for surgery.
[0046] In one embodiment, in order to facilitate the operator to know the moving length of the insulating sleeve 300 relative to the ablation electrode 203, a feeding scale is further provided on the first guide rod 1012, wherein the size of the feeding scale value is consistent with the length of the insulating sleeve 300 covering the ablation electrode 203. Figure 3As shown, the distance 104 between the push rod 102 and the first abutting surface 10111 is consistent with the length of the insulating sleeve 300 covering the ablation electrode 203 .
[0047] In one embodiment, Figure 2 and Figure 3 As shown, the ablation catheter also includes a development mark 204 for displaying the ablation length under CT, and the development mark includes a first marking ring 2041 and a second marking ring 2042. The first marking ring 2041 is arranged on the proximal portion 201 of the push sheath 200 near one end of the ablation electrode 203, and the second marking ring 2042 is arranged on the insulating sleeve 300 near the other end of the ablation electrode 203. Specifically, the development mark 204 is a platinum iridium ring or BASO4 and other materials, which can be displayed under CT; the first marking ring 2041 and the second marking ring 2042 are both arranged to overlap along the edges of the first end and the second end of the ablation electrode 203, so that the ablation length 2031 is more accurately developed, which is more conducive to the operator to perform the surgical operation.
[0048] In one embodiment, Figure 1 As shown, the ablation catheter also includes a power line 103, one end of the power line 103 is connected to the energy generator, and the other end of the power line 103 is connected to the wire drawing 301. A first conductor is arranged between the wire drawing 301 and the ablation electrode 203 to connect them, so as to realize energy transmission. In this embodiment, the wire drawing 301 is made of a conductive material. Optionally, the power line 103 can also be directly connected to the ablation electrode 203, specifically connected to the ablation electrode 203 through the first cavity or directly connected to the first end of the ablation electrode 203 extending to the proximal portion 201 of the push sheath 200. At this time, the first end of the ablation electrode 203 extends to both ends of the push sheath 200.
[0049] Further, refer to Figure 8 Since relative movement will occur between the pull wire 301 and the ablation electrode 203, when the power line 103 is connected to the ablation electrode 203 through the pull wire 301, a first conductor 3011 is set on the pull wire 301 near the ablation electrode 203 to electrically connect the pull wire 301 and the ablation electrode 203, and the first conductor 3011 is set with a preset length, so that when the insulating sleeve 300 is adjusted, the relative movement between the pull wire 301 and the ablation electrode 203 is met, and the first conductor 3011 will not be tightened or broken.
[0050] 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 adjusting ablation position, characterized in that: include: A pushing sheath tube has a first through lumen; an ablation electrode having a first end and a second end, wherein the ablation electrode separates the push sheath into relatively independent distal and proximal portions; the first end of the ablation electrode is connected to the proximal portion of the push sheath, and the second end of the ablation electrode is connected to the distal portion of the push sheath; an insulating sleeve, sleeved on the outside of the pushing sheath, one end of the insulating sleeve being arranged close to the first end or the second end of the ablation electrode, the insulating sleeve and the pushing sheath being able to move relative to each other, and the moving direction is consistent with the axial direction of the pushing sheath; and A drawing wire is arranged in the pushing sheath, the drawing wire is located in the first cavity, the insulating sleeve is arranged on the distal part of the pushing sheath, one end of the insulating sleeve is arranged close to the second end of the ablation electrode, the ablation electrode has a second cavity, and the drawing wire passes through the second cavity and is connected to the insulating sleeve.
2. The ablation catheter for adjusting the ablation position according to claim 1, characterized in that: The length of the insulating sleeve is greater than the ablation length of the ablation electrode.
3. The ablation catheter for adjusting the ablation position according to claim 1, characterized in that: A smooth guiding structure is provided at one end of the insulating sleeve away from the ablation electrode.
4. The ablation catheter for adjusting the ablation position according to claim 1, characterized in that: The ablation electrode is a basket weaving structure, the first end of the ablation electrode is embedded in the proximal part of the pushing sheath tube, and the distal end of the ablation electrode is embedded in the distal part of the pushing sheath tube.
5. The ablation catheter for adjusting the ablation position according to claim 4, characterized in that: The push sheath includes an outer tube and an inner tube, a preset gap is provided between the outer tube and the inner tube, the ablation electrode is arranged in the preset gap, the first end of the ablation electrode extends to the proximal end of the push sheath away from the ablation electrode, and the second end of the ablation electrode extends to the distal end of the push sheath away from the ablation electrode.
6. The ablation catheter for adjusting ablation position according to claim 1, characterized in that: It also includes a handle, which has a grip and a push rod, one end of the push sheath is connected to the push rod, one end of the wire drawing is connected to the handle, and the grip and the push rod can move relative to each other in the axial direction of the push rod.
7. The ablation catheter for adjusting the ablation position according to claim 6, characterized in that: The grip includes a horizontal grip rod and a first guide rod. The push rod is provided with a third cavity matched with the first guide rod. The first guide rod is movably arranged in the third cavity of the push rod.
8. The ablation catheter for adjusting the ablation position according to claim 7, characterized in that: The diameter of the first guide rod is smaller than the diameter of the horizontal grip rod, forming a first abutting surface. When one end of the push rod abuts against the first abutting surface, the effective ablation length of the ablation electrode is maximized.
9. The ablation catheter for adjusting the ablation position according to claim 7, characterized in that: A first limiting structure is provided between the push rod and the handle, and the first limiting structure includes a first limiting groove provided on the first guide rod and a first limiting boss provided on the inner wall of the push rod, or a first limiting boss provided on the first guide rod and a first limiting groove provided on the inner wall of the push rod, and the first limiting boss is clamped on the first limiting groove to enable axial relative linear movement between the handle and the push rod.
10. The ablation catheter for adjusting the ablation position according to claim 7, characterized in that: The push rod is provided with a first threaded hole, and the first threaded hole is provided with an adapted locking screw, and one end of the locking screw can be abutted against the handle through the first threaded hole.
11. The ablation catheter for adjusting ablation position according to claim 7, characterized in that: A feeding scale is provided on the first guide rod, and a size of the feeding scale is consistent with a length of the insulating sleeve covering the ablation electrode.
12. The ablation catheter for adjusting ablation position according to claim 1, characterized in that: It also includes a development mark for displaying the ablation length, and the development mark includes a first marking ring and a second marking ring. The first marking ring is arranged on the proximal part of the push sheath, and the first marking ring is located at the edge of the proximal part of the push sheath, and the second marking ring is arranged on the insulating sleeve, and the second marking ring is arranged close to the edge of the insulating sleeve.
13. The ablation catheter for adjusting ablation position according to claim 1, characterized in that: It also includes a power line, the drawing wire has a conductive property, one end of the drawing wire is electrically connected to the power line, and the other end of the drawing wire is electrically connected to the ablation electrode.
14. The ablation catheter for adjusting ablation position according to claim 13, characterized in that: A first conductive wire is provided between the drawing wire and the ablation electrode, and the first conductive wire is provided with a preset length so that the drawing wire can move relative to the ablation electrode.