Radio frequency ablation needle and operation method thereof

Abstract

The radiofrequency ablation needle comprises an operation assembly and an ablation assembly, the operation assembly comprises an operation seat, an operation rod and a switching piece, the ablation assembly comprises an ablation part and an outer needle tube, the outer needle tube is connected with the operation seat, the ablation part penetrates through the outer needle tube, and the switching piece is connected with the operation seat. The ablation part is fixed to the operating rod, the operating base is provided with an inner cavity, at least part of the operating rod moves in the inner cavity in the axial direction so that the ablation part can be exposed out of the outer needle tube or collected into the outer needle tube, a switching piece is arranged on the operating base, a threaded groove is formed in the outer wall of the operating rod, and the switching piece is connected with the operating rod. When the switching piece and the threaded groove are limited, the operating rod can rotate, and when the switching piece is separated from the threaded groove, the operating rod can rotate and / or move linearly. According to the radio frequency ablation needle collecting device, the convenience of the radio frequency ablation needle during collecting is improved, and the radio frequency ablation needle is easy to operate for collecting.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a radiofrequency ablation needle and an operating method thereof. Background Art

[0002] Ablation therapy is a form of interventional treatment. The ablation electrode can form a good contact with the lesion. When the radio frequency current flows through the diseased tissue, the rapid change of the electromagnetic field causes the positive and negative ions in the cell tissue to move rapidly, the temperature of the lesion site rises, causing the cell tissue water to evaporate, dry and fall off, thereby achieving the purpose of radio frequency ablation therapy.

[0003] Existing radiofrequency ablation needles include umbrella-shaped electrodes that can be contracted or expanded. During ablation, the radiofrequency ablation needle will adhere to some denatured and carbonized diseased tissues, making the umbrella-shaped electrode have greater resistance when contracting. Using conventional linear push-pull contraction methods, there is a problem of difficulty in contracting the umbrella-shaped electrode. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a radiofrequency ablation needle and an operation method thereof, so as to improve the convenience of the radiofrequency ablation needle when converging, making it easy to operate and converging. In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A radiofrequency ablation needle comprises an operating assembly and an ablation assembly, wherein the operating assembly comprises an operating seat, an operating rod and a switching member, wherein the ablation assembly comprises an ablation part and an outer needle tube, wherein the outer needle tube is connected to the operating seat, wherein the ablation part passes through the outer needle tube, wherein the ablation part is fixed to the operating rod, wherein the operating seat is provided with an inner cavity, wherein at least a part of the operating rod moves axially in the inner cavity, so as to realize that the ablation part is exposed or retracted into the outer needle tube,

[0006] The operating seat is provided with a switching member, and the outer wall of the operating rod has a thread groove. When the switching member is limited by the thread groove, the operating rod can rotate, and when the switching member is disengaged from the thread groove, the operating rod can rotate and / or move linearly.

[0007] Specifically, the switching member includes a pressing portion and a limiting portion connected to each other;

[0008] The outer wall of the operating seat is provided with a mounting groove, the pressing portion is adapted to the mounting groove, and the limiting portion passes through the mounting groove and extends to the inner cavity.

[0009] When the pressing portion is subjected to force, the limiting portion moves radially along the inner cavity and is limited by the thread groove.

[0010] Specifically, the switching member further includes an elastic portion, the limiting portion and the elastic portion are arranged on the same side of the pressing portion, and the elastic portion abuts against the bottom of the mounting slot.

[0011] Specifically, the operating rod includes an operating body and a shifting portion arranged at the end of the operating body, the shifting portion slidingly cooperates with the inner cavity, and a gap is provided between the operating body and the inner cavity. When the pressing portion is not subjected to force, the limiting portion is located in the gap so that the limiting portion and the axial end face of the shifting portion can be movably abutted against each other.

[0012] Specifically, the operating assembly further includes a flushing interface, the operating seat is provided with a flushing cavity, the flushing interface is communicated with the flushing cavity, a medium channel is formed between the ablation part and the outer needle tube, and the flushing cavity is communicated with the medium channel.

[0013] Specifically, the ablation part includes a center needle and an umbrella needle; the center needle passes through the outer needle tube and is fixed to the operating rod, the umbrella needles are evenly arranged between the end of the center needle away from the operating rod and the outer needle tube, and the umbrella needle is circumferentially provided with a conductive tube to fix it to the center needle.

[0014] Specifically, when the operating rod moves axially toward the outer needle tube, the ablation portion extends out of the outer needle tube so that the umbrella needle is in an expanded state; when the operating rod moves axially away from the outer needle tube, the ablation portion retracts into the outer needle tube so that the umbrella needle is in a contracted state.

[0015] Specifically, the operating assembly further includes an operating part, which is disposed at the end of the operating rod away from the operating seat, and a connecting cavity is provided between the operating part and the operating rod, and the ablation part extends to the connecting cavity to enable the ablation part to be externally connected to a radio frequency power source.

[0016] The operation method of the radiofrequency ablation needle is applied to the radiofrequency ablation needle, and the operation method includes:

[0017] The ablation assembly is delivered to the target position, and the ablation portion is exposed from the outer needle tube by adjusting the operating rod to move axially, and the operating rod can rotate and / or move linearly to achieve ablation of the target ablation object;

[0018] Before the ablation portion is retracted into the outer needle tube, it is determined whether the target ablation object is adhered to the ablation portion. If the target ablation object is adhered to the ablation portion, the switching member is controlled to limit itself with the thread groove of the operating rod, and the operating rod is adjusted to move axially and rotationally to achieve the retraction of the ablation portion into the outer needle tube. If the ablation portion is not adhered to the target ablation object, the operating rod is adjusted to move axially and linearly to achieve the retraction of the ablation portion into the outer needle tube.

[0019] Specifically, before the step of determining whether the target ablation object is adhered to the ablation portion, the method further includes:

[0020] It is determined whether the target ablation object is adhered to the outer needle tube. If the target ablation object is adhered to the outer needle tube, a fluid medium is introduced into the medium channel for flushing until the target ablation object is no longer adhered to the outer needle tube.

[0021] Compared with the prior art, the radiofrequency ablation needle and the operation method thereof of the present invention have the following beneficial effects:

[0022] By arranging a switching piece on the operating seat, the outer wall of the operating rod has a threaded groove. When the switching piece is limited by the threaded groove, the operating rod can rotate. When the switching piece is disengaged from the threaded groove, the operating rod can rotate and / or move linearly. The use of the operating rod is more flexible. When there is a large resistance to the ablation part being retracted into the outer needle tube, such as denatured and carbonized tissue adhering to the ablation component, the switching piece is switched to the threaded groove limit. By rotating the operating rod, the resistance to the axial movement of the operating rod can be effectively reduced, and the movement of the operating rod is more stable, and accurate control of the moving distance can be achieved. When there is no large resistance to the ablation part being retracted into the outer needle tube, the switching piece is disengaged from the threaded groove, and the operating rod can move linearly along the axial direction in the inner cavity, and the control of the operating rod is faster. The overall radiofrequency ablation needle is simple to operate, and the control operation is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the convergence state of a radiofrequency ablation needle is provided for an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the deployed state of a radiofrequency ablation needle is provided for an embodiment of the present application;

[0025] Figure 3 One of the structural schematic diagrams of a radiofrequency ablation needle is provided for an embodiment of the present application;

[0026] Figure 4 for Figure 3 Schematic diagram of the local section of AA;

[0027] Figure 5 for Figure 4 A partial enlarged schematic diagram of

[0028] Figure 6 A second structural schematic diagram of a radiofrequency ablation needle is provided for an embodiment of the present application;

[0029] Figure 7 for Figure 6 A partial cross-sectional diagram of the middle BB;

[0030] Figure 8 for Figure 7 A partial enlarged schematic diagram of

[0031] Fig. 9 A schematic diagram of assembling the ablation unit and the operating rod is provided for the embodiment of the present application;

[0032] Fig.10 A partial schematic diagram of the ablation portion is provided for the embodiment of the present application.

[0033] Reference numerals:

[0034] An operating seat 1, an inner cavity 11, a mounting groove 12, a gap 13, a flushing cavity 14, a first seat body 15, and a second seat body 16;

[0035] Operating rod 2, thread groove 21, operating body 22, shifting portion 23, and slot 24;

[0036] Switching member 3, pressing portion 31, elastic portion 32, limiting portion 33, step 34;

[0037] Ablation part 4, central needle 41, umbrella needle 42, conductive tube 43, clamping part 44;

[0038] Outer needle tube 5, medium channel 51;

[0039] Flushing interface 6, blocking member 61;

[0040] Operating part 7, wiring cavity 71, wire interface 72. DETAILED DESCRIPTION

[0041] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] Embodiment 1

[0043] This embodiment provides a radiofrequency ablation needle for ablating diseased tissues. The radiofrequency ablation needle has the function of being extended and unfolded. The umbrella needle 42 as an umbrella-shaped electrode can realize ablation operation. The umbrella needle 42 also has the function of being retracted and contracted, so as to be stored in the outer needle tube 5 for convenient transfer operation. This embodiment changes the traditional method of contracting the umbrella-shaped needle only by linear push and pull, so that the umbrella-shaped needle can be more conveniently operated and the resistance of contraction of the umbrella-shaped needle can be reduced, which is described in detail below.

[0044] like Figure 1 , Figure 2As shown, the radiofrequency ablation needle includes an operating component and an ablation component. The operating component includes an operating seat 1, an operating rod 2 and a switching member 3. The ablation component includes an ablation part 4 and an outer needle tube 5. The operating seat 1 is provided with an inner cavity 11. The outer needle tube 5 is connected to the end of the operating seat 1 away from the operating rod 2. The ablation part 4 passes through the outer needle tube 5 and the operating rod 2, and the ablation part 4 is fixed to the operating rod 2; at least part of the operating rod 2 moves axially in the inner cavity 11 so that the ablation part 4 extends out of or retracts into the outer needle tube 5. The operating seat 1 is provided with a switching member 3, which passes through the operating seat 1 and extends to its inner cavity 11. The outer wall of the operating rod 2 has a threaded groove 21. When the switching member 3 is limited by the threaded groove 21, the operating rod 2 can rotate. When the switching member 3 is disengaged from the threaded groove 21, the operating rod 2 can rotate and / or move linearly.

[0045] The operating component also includes an operating part 7, which is arranged at the end of the operating rod 2 away from the operating seat 1. The operating part 7 and the operating rod 2 are provided with a through wiring cavity 71, and the end of the operating part 7 is provided with a wire interface 72 connected to the wiring cavity 71. The ablation part 4 passes through the wiring cavity 71 and extends to the wire interface 72. The wire interface 72 is externally connected to a radio frequency connecting line for connecting the ablation part 4 to a radio frequency power supply (not shown in the figure).

[0046] The operating assembly also includes a flushing interface 6. The operating seat 1 is provided with a flushing cavity 14. The flushing interface 6 is connected to the flushing cavity 14. A medium channel 51 is formed between the ablation part 4 and the outer needle tube 5. The flushing cavity 14 is connected to the medium channel 51. A blocking member 61 is provided on the flushing interface 6. When the outer needle tube 5 needs to be flushed, the blocking member 61 is opened to expose the flushing interface 6. The flushing interface 6 is connected to the fluid medium. The fluid medium is discharged from the flushing cavity 14 through the medium channel 51 from the outer needle tube 5, which can flush out the denatured and carbonized tissues remaining in the outer needle tube 5, further reducing the resistance of the ablation part 4 to the outer needle tube 5.

[0047] In this embodiment, a switching member 3 is provided on the operating seat 1, and the switching member 3 extends through the operating seat 1 to its inner cavity 11. The outer wall of the operating rod 2 has a thread groove 21. When the switching member 3 is limited by the thread groove 21, the operating rod 2 can rotate. When the switching member 3 is separated from the thread groove 21, the operating rod 2 can rotate and / or move linearly. The use of the operating rod 2 is more flexible. When there is a large resistance to the ablation part 4 being gathered into the outer needle tube 5, such as the denatured and carbonized tissue adhering to the ablation component, the switching member 3 is limited by the thread groove 21. By rotating the operating rod 2, the resistance to the axial movement of the operating rod 2 can be effectively reduced, and the control of the movement of the operating rod 2 is more stable, and the precise control of the moving distance can be achieved. When there is no large resistance to the ablation part 4 being gathered into the outer needle tube 5, the switching member 3 is separated from the thread groove 21, and the operating rod 2 can move linearly along the axial direction in the inner cavity 11, and the control of the operating rod 2 is faster. The operation mode of the overall radiofrequency ablation needle is simple, and the control operation is relatively convenient.

[0048] Embodiment 2

[0049] This embodiment optimizes the radiofrequency ablation needle on the basis of the above embodiment, and in particular provides a specific implementation method of an operating component:

[0050] like Figure 3-Figure 8 As shown, the operating assembly includes an operating seat 1 and a flushing interface 6; the operating seat 1 includes a first seat body 15 and a second seat body 16, which can be integrally arranged or detachably arranged. In this embodiment, the first seat body 15 and the second seat body 16 are detachably connected, one end of the first seat body 15 is plugged with the second seat body 16, and the other end of the first seat body 15 is plugged with the outer needle tube 5.

[0051] Specifically, the first seat body 15 is sealed and plugged with the second seat body 16. The outer needle tube 5 is sealed and plugged with the first seat body 15.

[0052] A flushing cavity 14 is formed between the first seat body 15 and the second seat body 16, and a flushing interface 6 is provided on the outer wall of the first seat body 15, and the flushing interface 6 passes through the flushing cavity 14. The end of the outer needle tube 5 extends into the flushing cavity 14, and the medium channel 51 between the outer needle tube 5 and the ablation part 4 is directly connected to the flushing cavity 14. The flushing interface 6 can be externally connected to a fluid medium of a certain pressure, thereby realizing the flushing effect of the fluid medium in the medium channel 51.

[0053] The blocking member 61 is detachably connected to the flushing interface 6 , and specifically, the inner wall of the blocking member 61 is threadedly matched with the outer wall of the flushing interface 6 , so as to facilitate the disassembly of the blocking member 61 and enable the external needle tube 5 to be flushed in time.

[0054] The second seat body 16 has an inner cavity 11 therein, and the inner cavity 11 is communicated with the flushing cavity 14 , so that the ablation portion 4 can extend from the flushing cavity 14 into the inner cavity 11 and be connected with the operating rod 2 .

[0055] At least part of the operating rod 2 is arranged in the inner cavity 11. The operating rod 2 includes an operating body 22 and a shifting portion 23 arranged at the end of the operating body 22 away from the operating portion 7. The diameter of the shifting portion 23 is larger than the diameter of the operating body 22, and the outer periphery of the shifting portion 23 is slidably matched with the inner periphery of the inner cavity 11. A gap 13 is provided between the operating body 22 and the inner wall of the inner cavity 11.

[0056] The stopper 23 is provided with a slot 24, and a snap-in 44 is provided in the slot 24 for limiting the ablation part 4 along the radial direction of the stopper 23, so that the ablation part 4 can be quickly connected to the operating rod 2, and accordingly, the convenience of assembling the ablation part 4 is increased. In this embodiment, the snap-in 44 is a U-shaped structure, and the U-shaped bayonet position of the snap-in 44 is snap-fitted with the outer wall of the ablation part 4, so that the ablation part 4 is coaxially and stably connected to the operating rod 2, and the ablation part 4 can rotate together with the operating rod 2.

[0057] The switching member 3 includes a pressing portion 31, an elastic portion 32 and a limiting portion 33. The center of the pressing portion 31 is connected to the limiting portion 33. The limiting portion 33 and the elastic portion 32 are arranged on the same side of the pressing portion 31. The outer wall of the second seat body 16 is provided with a mounting groove 12 for installing the switching member 3. The pressing portion 31 is adapted to the notch of the mounting groove 12. The limiting portion 33 penetrates the mounting groove 12 and extends into the inner cavity 11. The elastic portion 32 abuts against the bottom of the mounting groove 12. A step 34 is arranged at the end of the limiting portion 33 to prevent the switching member 3 from easily loosening from the second seat body 16.

[0058] When the pressing part 31 is acted upon by an external force, the pressing part 31 is subjected to the force which is transmitted to the elastic part 32. The elastic part 32 abuts against the bottom of the mounting groove 12 and then undergoes elastic deformation. The limiting part 33 extends radially along the inner cavity 11 until the limiting part 33 abuts against the threaded groove 21. The operating rod 2 can only move axially by rotation, thereby achieving stable control of the operating rod 2 and overcoming the resistance of the ablation part 4 to be retracted into the outer needle tube 5, so that the ablation part 4 can be smoothly retracted into the outer needle tube 5.

[0059] When the external force of the pressing part 31 is withdrawn, the elastic part 32 automatically rebounds and resets, and then the limiting part 33 is separated from the thread groove 21, and the operating rod 2 can rotate and / or move linearly in the axial direction. In the initial position of reset, the limiting part 33 can be movably abutted against the axial end face of the blocking part 23, which means that when there is no external force on the limiting part 33, the limiting part 33 extends and protrudes from the cavity wall of the inner cavity 11, that is, the limiting part 33 extends to the gap 13 between the operating body 22 and the inner wall of the inner cavity 11, and can be movably abutted against the axial end face of the blocking part 23 without hindering the normal axial movement of the operating rod 2, so as to limit the blocking part 23, and effectively prevent the operating rod 2 from being separated from the inner cavity 11 due to erroneous operation.

[0060] Embodiment 3

[0061] This embodiment optimizes the radiofrequency ablation needle on the basis of the above embodiment, and in particular provides a specific implementation method of the ablation part:

[0062] like Fig. 9 , Fig.10As shown, the ablation part 4 includes a central needle 41 and an umbrella needle 42; the central needle 41 axially penetrates the outer needle tube 5 and is fixed to the operating rod 2, and the umbrella needles 42 are evenly arranged between the end of the central needle 41 away from the operating rod 2 and the outer needle tube 5, and the umbrella needles 42 are circumferentially provided with a conductive tube 43 to fix it to the central needle 41, so that the central needle 41 is electrically connected to the umbrella needle 42. The central needle 41 is connected to the radio frequency power supply through the radio frequency connection line to realize the radio frequency ablation function.

[0063] When the operating rod 2 moves axially, the operating rod 2 drives the central needle 41 to rotate synchronously and / or move linearly. The operating rod 2 gradually approaches the outer needle tube 5, and when the umbrella needle 42 is exposed from the outer needle tube 5, the umbrella needle 42 is in an extended state; when the operating rod 2 gradually moves away from the outer needle tube 5, and when the umbrella needle 42 is retracted into the outer needle tube 5, the umbrella needle 42 is in a retracted state.

[0064] Embodiment 4

[0065] This embodiment provides an operation method, which is applied to the radiofrequency ablation needle in the above embodiment, and the method includes:

[0066] S11, deliver the ablation component to the target position, adjust the operating rod 2 to move axially so that the outer needle tube 5 is exposed outside the ablation part 4, and the operating rod 2 can rotate and / or move linearly to achieve ablation of the target ablation object; specifically, the ablation part 4 forms an energy path with the radio frequency power supply through the target ablation object to achieve the purpose of ablation, wherein the target ablation object can be a diseased tissue, and the target position can be the location of the target ablation object.

[0067] S12, before the ablation part 4 is retracted into the outer needle tube 5, it is determined whether the target ablation object is adhered to the ablation part 4;

[0068] If the ablation part 4 has a target ablation object attached to it, the switching member 3 is pressed to limit it with the thread groove 21 of the operating rod 2, and the operating rod 2 is adjusted to rotate along the axial direction, so that the ablation part 4 overcomes the resistance brought by the target ablation object, so as to realize the ablation part 4 being retracted into the outer needle tube 5;

[0069] If the ablation part 4 is not adhered to the target ablation object, the operating rod 2 is adjusted to move in a straight line along the axial direction to achieve the retraction of the ablation part 4 into the outer needle tube 5; at this time, the switching member 3 is in a pressure-free state, the switching member 3 is reset to the initial position, and the threaded groove 21 of the operating rod 2 is not limited, and the operating rod 2 can move in a straight line and quickly retract into the outer needle tube 5.

[0070] Before step S12, the method further includes the following steps:

[0071] Determine whether the target ablation object is adhered to the outer needle tube 5;

[0072] If the target ablation object is adhered to the outer needle tube 5, a fluid medium is connected to the flushing interface 6, so that the fluid medium enters the medium channel 51 between the ablation part 4 and the outer needle tube 5 for flushing until the target ablation object is no longer adhered to the outer needle tube 5;

[0073] If the target ablation object is not adhered to the outer needle tube 5, the subsequent steps are performed.

[0074] In the description of the present application, it should be understood that the terms "center", "axial", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0076] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0077] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A radiofrequency ablation needle, characterized in that: The invention comprises an operating assembly and an ablation assembly, wherein the operating assembly comprises an operating seat (1), an operating rod (2) and a switching member (3), and the ablation assembly comprises an ablation part (4) and an outer needle tube (5), wherein the outer needle tube (5) is connected to the operating seat (1), the ablation part (4) passes through the outer needle tube (5), and the ablation part (4) is fixed to the operating rod (2); the operating seat (1) is provided with an inner cavity (11), and at least a part of the operating rod (2) moves axially in the inner cavity (11) to realize that the ablation part (4) is exposed or retracted into the outer needle tube (5). The operating seat (1) is provided with a switching member (3), and the outer wall of the operating rod (2) has a thread groove (21). When the switching member (3) is limited by the thread groove (21), the operating rod (2) can rotate; when the switching member (3) is disengaged from the thread groove (21), the operating rod (2) can rotate and / or move linearly.

2. The radiofrequency ablation needle according to claim 1, characterized in that: The switching member (3) comprises a pressing portion (31) and a limiting portion (33) which are connected to each other; The outer wall of the operating seat (1) is provided with a mounting groove (12), the pressing portion (31) is adapted to the mounting groove (12), the limiting portion (33) passes through the mounting groove (12) and extends to the inner cavity (11), and when the pressing portion (31) is subjected to force, the limiting portion (33) moves radially along the inner cavity (11) and is limited by the threaded groove (21).

3. The radiofrequency ablation needle according to claim 2, characterized in that: The switching member (3) further comprises an elastic portion (32), the limiting portion (33) and the elastic portion (32) are arranged on the same side of the pressing portion (31), and the elastic portion (32) abuts against the bottom of the mounting groove (12).

4. The radiofrequency ablation needle according to claim 2, characterized in that: The operating rod (2) comprises an operating body (22) and a stopper (23) arranged at the end of the operating body (22); the stopper (23) is slidably matched with the inner cavity (11); a gap (13) is provided between the operating body (22) and the inner cavity (11); When the pressing portion (31) is not subjected to force, the limiting portion (33) is located in the gap (13), so that the limiting portion (33) and the axial end surface of the blocking portion (23) can be movably abutted against each other.

5. The radiofrequency ablation needle according to claim 1, characterized in that: The operating assembly further comprises a flushing interface (6), the operating seat (1) is provided with a flushing cavity (14), the flushing interface (6) is communicated with the flushing cavity (14), a medium channel (51) is formed between the ablation portion (4) and the outer needle tube (5), and the flushing cavity (14) is communicated with the medium channel (51).

6. The radiofrequency ablation needle according to claim 1, characterized in that: The ablation part (4) comprises a center needle (41) and an umbrella needle (42); the center needle (41) passes through the outer needle tube (5) and is fixed to the operating rod (2); the umbrella needles (42) are evenly arranged between the end of the center needle (41) away from the operating rod (2) and the outer needle tube (5); and the umbrella needle (42) is circumferentially provided with a conductive tube (43) for fixing it to the center needle (41).

7. The radiofrequency ablation needle according to claim 6, characterized in that: When the operating rod (2) moves axially toward the outer needle tube (5), the ablation portion (4) extends out of the outer needle tube (5) so that the umbrella needle (42) is in an expanded state; when the operating rod (2) moves axially away from the outer needle tube (5), the ablation portion (4) retracts into the outer needle tube (5) so that the umbrella needle (42) is in a contracted state.

8. The radiofrequency ablation needle according to claim 1, characterized in that: The operating assembly further comprises an operating portion (7), wherein the operating portion (7) is arranged at an end of the operating rod (2) away from the operating seat (1), and a connecting cavity (71) is provided between the operating portion (7) and the operating rod (2), and the ablation portion (4) extends to the connecting cavity (71) so as to enable the ablation portion (4) to be externally connected to a radio frequency power source.

9. A method for operating a radiofrequency ablation needle, applied to the radiofrequency ablation needle according to any one of claims 1 to 8, characterized in that: The operation methods include: The ablation assembly is delivered to the target position, and the ablation portion (4) is exposed from the outer needle tube (5) by adjusting the operating rod (2) to move axially, and the operating rod (2) can rotate and / or move linearly to achieve ablation of the target ablation object; Before the ablation part (4) is retracted into the outer needle tube (5), it is determined whether the target ablation object is adhered to the ablation part (4); if the target ablation object is adhered to the ablation part (4), the switching member (3) is controlled to limit the position with the thread groove (21) of the operating rod (2), and the operating rod (2) is adjusted to move axially and rotationally to achieve the retraction of the ablation part (4) into the outer needle tube (5); if the ablation part (4) is not adhered to the target ablation object, the operating rod (2) is adjusted to move axially and linearly to achieve the retraction of the ablation part (4) into the outer needle tube (5).

10. The method for operating a radiofrequency ablation needle according to claim 9, characterized in that: Before the step of judging whether the target ablation object is adhered to the ablation portion (4), the method further comprises: It is determined whether the target ablation object is adhered to the outer needle tube (5); if the target ablation object is adhered to the outer needle tube (5), a fluid medium is introduced into the medium channel (51) for flushing until the target ablation object is no longer adhered to the outer needle tube (5).

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