CN112957122A - Radio frequency ablation device - Google Patents

Abstract

The invention provides a radio frequency ablation device, which comprises a sleeve unit, a radio frequency ablation assembly and a liquid supply assembly, wherein the sleeve unit is arranged on the sleeve unit; the sleeve unit comprises an inner pipe and an outer pipe which are fixedly embedded inside and outside, a cavity is defined between the inner pipe and the outer pipe, a through hole is formed in the side wall of one section of the cavity, which is used for extending into the body of a patient, and is used for forming the communication between the cavity and the outside, and an input port communicated with the cavity is formed in one section of the sleeve unit, which is used for remaining outside the body of the patient; the radiofrequency ablation assembly comprises an electrode needle, wherein the electrode needle is used for penetrating through an inner hole of the inner tube; the liquid supply assembly comprises a liquid storage unit and a heating unit, the heating unit is used for heating liquid in the liquid storage unit, a communication pipeline is arranged between the liquid storage unit and the input port, and the communication pipeline is used for supplying the liquid storage unit to convey liquid into the cavity. The radio frequency ablation device can stop bleeding quickly and reduce the risk of tumor implantation and diffusion along the needle channel.

Description

Radio frequency ablation device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a radio frequency ablation device.

Background

In the prior art, for tumor diagnosis of liver, kidney and other parts, a biopsy needle can be used to puncture to a lesion position, and a small amount of tissue of a part of the lesion position is obtained, and then pathological analysis is performed. For the treatment of the lesion part, the radio frequency ablation needle can be inserted into a lesion, and the radio frequency energy causes local tissues of the lesion to generate high temperature, so that the tissue of the lesion is coagulative and necrotized to achieve the treatment purpose. However, at present, after lesion ablation is completed and when the radio frequency ablation needle is pulled out, parenchymal organs such as the liver often combine to bleed, an effective hemostasis mode is not provided, and if the tumor is a malignant tumor, the risk of implantation and diffusion along a needle path exists.

Disclosure of Invention

In view of the above, the present invention is directed to a radiofrequency ablation device, which can effectively stop bleeding when the ablation device is completely withdrawn.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a radio frequency ablation device comprising:

the sleeve unit comprises an inner pipe and an outer pipe which are fixedly embedded inside and outside, a cavity is defined between the inner pipe and the outer pipe, a through hole is formed in the side wall of one section of the cavity, which is used for extending into the body of a patient, the through hole is used for forming the communication between the cavity and the outside, and an input port communicated with the cavity is formed in one section of the sleeve unit, which is used for being left outside the body of the patient;

the radio frequency ablation assembly comprises an electrode needle, and the electrode needle is used for penetrating in an inner hole of the inner tube;

the liquid supply assembly comprises a liquid storage unit and a heating unit, the heating unit is used for heating liquid in the liquid storage unit, a communicating pipeline is arranged between the liquid storage unit and the input port, and the communicating pipeline is used for supplying the liquid storage unit to convey the liquid in the cavity.

Furthermore, the through hole penetrates through the side wall of the inner tube, and when the electrode needle penetrates into the inner tube, the periphery of the electrode needle can block the through hole; and an output port is arranged on the other opposite side of the sleeve unit relative to the side provided with the input port, and the output port is used for allowing the liquid flowing into the cavity to flow out.

Furthermore, the inner hole of the inner tube comprises a large-diameter section, a transition section and a small-diameter section which are sequentially connected in series from outside to inside, and the through hole penetrates through the side wall of the small-diameter section.

Furthermore, one of the outside of bushing unit serves and is equipped with connecting portion, the radiofrequency ablation subassembly still includes melts operating handle, the electrode needle install in melt on the operating handle, just it is equipped with first linkage unit on the operating handle to melt, first linkage unit with the connection can be dismantled to connecting portion, first linkage unit with when connecting portion are connected, melt operating handle and can accept the outside and order about and drive the electrode needle in rotate in the inner tube.

Furthermore, the connecting part comprises a holding section and a connecting section, the holding section is connected to one end of the outside of the sleeve unit in series, the connecting section is connected to one end of the outside of the holding section in series, and the first connecting unit comprises a connecting piece which is rotatably arranged on the ablation operating handle and can be detachably connected with the connecting section.

Furthermore, a fixing piece capable of penetrating into the holding section is arranged on the ablation operating handle, and the electrode needle is fixedly arranged on the fixing piece; a transmission unit is arranged between the ablation operating handle and the fixing piece, and the fixing piece can receive the driving of the rotation of the ablation operating handle and move along the axial direction of the sleeve pipe unit through the transmission of the transmission unit; and a guide unit capable of being matched with or separated from the fixing piece is arranged on the holding section, and when the guide unit is matched with the fixing piece, the guide unit is used for forming guide for the axial movement of the fixing piece along the sleeve unit.

Furthermore, the section of the holding section perpendicular to the axial direction of the sleeve unit is square, the guide unit comprises clamping plates arranged on two inner walls of the holding section, one end of each clamping plate is fixedly connected with the inner wall, a pressing rod is arranged at the other end of each clamping plate, the pressing rod penetrates through the corresponding inner wall outwards, and each pressing rod is used for bearing external pressing to enable the two clamping plates to clamp the fixing piece.

Furthermore, the ablation operating handle is provided with a mounting hole for the fixing piece to penetrate, and the transmission unit comprises a first external thread and a first internal thread, wherein the first external thread is formed on the periphery of the fixing piece, and the first internal thread is formed on the inner wall of the mounting hole and can be in threaded connection with the first external thread.

Furthermore, a second internal thread is formed in an inner hole of the connecting section, and an external thread capable of being in threaded connection with the internal thread is formed on the periphery of the connecting piece.

Further, the electrode needle assembly further comprises a biopsy needle which is alternately arranged in the inner hole of the inner tube in a penetrating mode with the electrode needle.

Compared with the prior art, the invention has the following advantages:

according to the radio frequency ablation device, the sleeve unit which is surrounded to form the cavity is arranged, the through hole which is communicated with the cavity is formed in one end inside the sleeve unit, the electrode needle can be pulled out firstly after ablation operation is completed, then high-temperature normal saline is injected into the cavity while the sleeve unit is pulled out, the normal saline flows out through the through hole and burns a wound surface, a good hemostasis effect can be achieved, scab tissues attached to the needle point can be obviously reduced due to the effect of the normal saline when the needle point leaves the surface of the liver, the risk of liver surface bleeding can be reduced on one hand, and the risk of needle path planting diffusion can be reduced at the same time.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the operation of a radiofrequency ablation device according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic view of an arrangement structure of through holes according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of a radiofrequency ablation device according to a fourth embodiment of the invention;

fig. 5 is a schematic structural diagram of a radio frequency ablation device according to the fifth embodiment of the present invention.

Description of reference numerals:

1-a cannula unit, 11-an inner tube, 12-an outer tube, 13-a blocking plate, 101-a cavity, 102-a through hole, 2-a radio frequency ablation assembly, 21-an ablation operation handle, 22-an electrode needle, 23-a connecting piece, 3-a liquid supply assembly, 31-a liquid storage unit, 32-a communication pipeline, 33-a piston, 34-a heating unit, 4-a connecting part, 41-a holding section, 42-a connecting section, 51-a cylindrical section, 52-a square column section, 61-a clamping plate and 62-a pressing rod.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

The embodiment relates to a radio frequency ablation device, which is shown in fig. 1 and comprises acannula unit 1, a radiofrequency ablation assembly 2 and aliquid supply assembly 3. Thesleeve unit 1 comprises aninner tube 11 and anouter tube 12 which are fixedly embedded inside and outside, acavity 101 is defined between theinner tube 11 and theouter tube 12, a throughhole 102 is formed in the side wall of one section of thecavity 101, which is used for extending into the body of a patient, thethrough hole 102 is used for communicating thecavity 101 with the outside, and an input port communicated with thecavity 101 is formed in one section of thesleeve unit 1, which is used for being left outside the body of the patient. Theradiofrequency ablation assembly 2 comprises anelectrode needle 22, and theelectrode needle 22 is arranged in the inner hole of theinner tube 11 in a penetrating mode. Theliquid supply assembly 3 comprises aliquid storage unit 31 and aheating unit 34, theheating unit 34 is used for heating liquid in theliquid storage unit 31, acommunication pipeline 32 is arranged between theliquid storage unit 31 and the input port, and thecommunication pipeline 32 is used for supplying the liquid to thecavity 101 from theliquid storage unit 31.

Referring to fig. 1 and 2, theinner tube 11 and theouter tube 12 of the present embodiment are coaxially arranged, and the outer diameter of theinner tube 11 is smaller than the inner diameter of theouter tube 12, so as to form a gap between theinner tube 11 and theouter tube 12, the two ends of theinner tube 11 are respectively provided with ablocking plate 13 extending towards theouter tube 12 and fixedly connected with theouter tube 12, and theblocking plates 13 at the two ends and theinner tube 11 and theouter tube 12 between the twoblocking plates 13 define the above-mentionedcavity 101. In this embodiment, thethrough hole 102 is disposed through the sidewall of theouter tube 12 and is communicated with thecavity 101, the liquid in thecavity 101 can flow out through the throughhole 102, and the throughhole 102 is preferably disposed near one end of the inner portion of theinner tube 11. A connecting tube extending outward is fixedly arranged on a section of theouter tube 12 which is used for being left outside the patient, an inner hole of the connecting tube is communicated with thecavity 101, and the inner hole of the connecting tube forms the input port.

Theradiofrequency ablation assembly 2 of the present embodiment may adopt an existing radiofrequency ablation needle, and the radiofrequency ablation needle may pass through the inner hole of theinner tube 11 and reach the lesion to perform ablation operation.

Referring to fig. 1, theliquid storage unit 31 of this embodiment is a cylindrical barrel, an output port is provided at one end of the barrel, the output port is connected to the input port via acommunication pipeline 32, a piston 33 is slidably provided in the barrel, and a driving device is connected to the piston 33 and is configured to drive the piston 33 to slide, so as to pressurize the liquid in the barrel, so that the liquid flows into thecavity 101 and flows out through the throughhole 102. The driving device may be, for example, a cylinder, a hydraulic cylinder, or a linear motor, and the structure of the driving device driving the piston 33 to move linearly may refer to the prior art, and will not be described in detail herein.

In this embodiment, theheating unit 34 employs an electric heating plate disposed inside the cylinder, and the electric heating plate is disposed near the output port so as not to affect the sliding of the piston 33; the structure for heating the liquid in the cylinder body by the electric heating plate can adopt the existing mature technology, and is not described again. It should be noted that theheating unit 34 may also be an electric heater disposed on thecommunication pipeline 32, or an electric heater disposed on the outer periphery of the cylinder, as long as the liquid inside theliquid storage unit 31 can be heated.

The working process of the radiofrequency ablation device of the embodiment is as follows: firstly, a medical staff penetrates theelectrode needle 22 into thecannula unit 1, and the end part of theelectrode needle 22 is exposed to a proper length; secondly, under the guide of an ultrasonic device, thecannula unit 1 and theelectrode needle 22 are inserted into a focus, and the radiofrequency ablation component 2 is started to perform radio frequency ablation; after the radio frequency ablation is completed, the position of thesleeve unit 1 is firstly maintained, and theelectrode needle 22 is drawn out; then, high-temperature (e.g., 100 ℃) physiological saline is injected into thecavity 101 from thereservoir unit 31, and thecannula unit 1 is withdrawn while the physiological saline continuously drips out from thethrough hole 102.

In summary, in the radio frequency ablation device according to the embodiment, thecannula unit 1 enclosing thecavity 101 is arranged, the throughhole 102 communicated with thecavity 101 is arranged at one end inside thecannula unit 1, after the ablation operation is completed, theelectrode needle 22 can be firstly pulled out, then the high-temperature saline is injected into thecavity 101 while thecannula unit 1 is pulled out, and the saline flows out through the throughhole 102, so that on one hand, the wound surface can be burned, and a good hemostatic effect can be achieved; on the other hand, when the needle point leaves the surface of the liver, the normal saline can obviously reduce scab tissues attached to the needle point and reduce the risk of needle channel planting diffusion.

Example two

The present embodiment relates to a radiofrequency ablation device having substantially the same structure as the radiofrequency ablation device of the first embodiment, except that: in this embodiment, referring to fig. 3, the throughhole 102 is disposed through the sidewall of theinner tube 11, and when theelectrode needle 22 penetrates into theinner tube 11, the outer circumference of theelectrode needle 22 can seal the throughhole 102; an output port is provided on the other opposite side of thecasing unit 1 with respect to the side provided with the input port, and a switch for opening or closing the output port is provided on the output port; when the switch is turned on, the liquid flowing into thechamber 101 can flow out through the outlet. Since the output port and the switch are not shown in the drawings of the present embodiment, the liquid output from the output port can be directly discharged or can be circulated back into theliquid storage unit 31.

When the radiofrequency ablation is performed, theelectrode needle 22 transmits radiofrequency energy to generate high temperature, so that tissue coagulative necrosis is achieved to achieve the purpose of treatment, but the high temperature can also affect normal tissues which do not need ablation operation. In this embodiment, by setting the above structure, when performing radio frequency ablation, since theelectrode needle 22 blocks the throughhole 102, theliquid storage unit 31 can input normal temperature (for example, 25 ℃) normal saline into thecavity 101 through the input port, and flow out through the output port, and thesleeve unit 1 is cooled by the normal saline, thereby avoiding affecting normal human tissues.

The working process of the radiofrequency ablation device in this embodiment is substantially the same as that of the radiofrequency ablation device in the first embodiment, except that in this embodiment, normal-temperature physiological saline is input into thecavity 101 from theliquid storage unit 31 when theelectrode needle 22 performs radiofrequency ablation.

By adopting the structure, the radiofrequency ablation device of the embodiment can cool thesleeve unit 1 during radiofrequency ablation of theelectrode needle 22, so that the influence of high temperature caused by radiofrequency ablation on normal physiological tissues is avoided; on the other hand, through the structure that theelectrode needle 22 blocks the throughhole 102, no additional accessory is needed, thecavity 101 can be cooled, and after the radio frequency ablation is finished, high-temperature normal saline is dripped into the wound to burn the wound surface, so that a good hemostatic effect is achieved.

EXAMPLE III

This embodiment relates to a radiofrequency ablation device having substantially the same structure as the radiofrequency ablation device described in the second embodiment, except that: in this embodiment, the inner hole of theinner tube 11 includes a large diameter section, a transition section, and a small diameter section, which are sequentially arranged from outside to inside, and the throughhole 102 specifically penetrates through a sidewall of the small diameter section.

In order to provide theelectrode needle 22 with a good sealing effect on the throughhole 102, the gap between theelectrode needle 22 and theinner tube 11 should be as small as possible, which is inconvenient for theelectrode needle 22 to penetrate into theinner tube 11. For this reason, in this embodiment, the inner hole of theinner tube 11 is configured to include a large diameter section, a transition section, and a small diameter section, and the throughhole 102 is disposed on the side wall of the small diameter section, so that theelectrode needle 22 can conveniently pass through theinner tube 11, and theelectrode needle 22 can have a better plugging effect on the throughhole 102.

Example four

The present embodiment relates to a radiofrequency ablation device having substantially the same structure as the radiofrequency ablation device of the first embodiment, except that: in this embodiment, one end of the outside of thecannula unit 1 is provided with the connectingportion 4, therf ablation assembly 2 further includes anablation operating handle 21, theelectrode needle 22 is specifically installed on theablation operating handle 21, and theablation operating handle 21 is provided with a first connecting unit, the first connecting unit is detachably connected with the connectingportion 4, and when the first connecting unit is connected with the connectingportion 4, theablation operating handle 21 can accept the outside and drive theelectrode needle 22 to rotate in theinner tube 11. Referring to fig. 4, theconnection portion 4 of the present embodiment includes a holdingsection 41 connected in series to one end of the exterior of thecannula unit 1, and aconnection section 42 connected in series to one end of the exterior of the holdingsection 41, and the first connection unit specifically includes aconnection member 23 rotatably provided on the ablation operation handle 21 and detachably connected to theconnection section 42. Wherein, the inner hole of the holdingsection 41, the inner hole of the connectingsection 42 and the inner hole of theinner tube 11 are communicated to allow theelectrode needle 22 to penetrate.

The axial section of the holdingsection 41 perpendicular to thecannula unit 1 is square, so that the medical staff can hold the two opposite sides of thecannula unit 1 conveniently, and thecannula unit 1 is prevented from rotating. It should be noted that the cross section of the holdingsection 41 may also be polygonal. The connectingpiece 42 in this embodiment is cylindrical and has a second internal thread formed on its inner bore. The connectingpiece 23 is circular, a second external thread screwed with the second internal thread is formed on the periphery of the connecting piece, and the connectingsection 42 and the connectingpiece 23 are detachably connected through the screwing between the second internal thread and the second external thread. It should be noted that the connectingsection 42 can also be configured to rotate relative to the holdingsection 41 to secure the connectingmember 23 to theablation operating handle 21.

The operation of the rf ablation device of this embodiment is substantially the same as that of the rf ablation device of the first embodiment, except that: the radiofrequency ablation device of the present embodiment is capable of rotating theelectrode needle 22 within thecannula unit 1 by rotating the ablation manipulation handle by pinching thegrip section 41 by the medical staff when necessary.

The radiofrequency ablation device of the embodiment can keep the outer sleeve from rotating when theelectrode needle 22 needs to be rotated, so that the damage to the tissue is reduced, and the rotation resistance is small.

EXAMPLE five

The present embodiment relates to a radiofrequency ablation device having substantially the same structure as the radiofrequency ablation device of the fourth embodiment, except that: in this embodiment, theablation operating handle 21 is provided with a fixing member capable of penetrating into the holdingsection 41, and theelectrode needle 22 is fixedly arranged on the fixing member; a transmission unit is arranged between theablation operating handle 21 and the fixing piece, and the fixing piece can receive the driving of the rotation of theablation operating handle 21 and move along the axial direction of thesleeve unit 1 through the transmission of the transmission unit; and the holdingsection 41 is provided with a guide unit which can be matched with or separated from the fixing piece, and when the guide unit is matched with the fixing piece, the guide unit is used for forming guide for the fixing piece to move along the axial direction of thecannula unit 1.

Referring to fig. 5, in the present embodiment, a mounting hole is formed in theablation operating handle 21, the fixing member specifically includes acylindrical section 51 and asquare column section 52 connected in series, wherein thecylindrical section 51 is inserted into the mounting hole, and theelectrode needle 22 is specifically disposed on an end portion of thesquare column section 52; the transmission unit specifically includes a first external thread formed on the outer periphery of thecylindrical section 51, and a first internal thread formed on the inner wall of the mounting hole; when the guiding unit is matched with the fixing piece, thecylindrical section 51 can be driven to move along the axial direction of the cylindrical section by the rotation of theablation operating handle 21.

In this embodiment, referring to fig. 5, the guiding unit includes clampingplates 61 disposed on two inner walls of the holdingsection 41, one end of each clampingplate 61 is fixedly connected to the inner wall, the other end is provided with apressing rod 62, the pressingrod 62 penetrates through the corresponding inner wall to the outside, and eachpressing rod 62 is used for receiving external pressure to clamp the two clampingplates 61 and form a fixing member. That is, when the twopressing rods 62 are not pressed by the outside, the aforementionedsquare column section 52 can rotate in the holdingsection 41 to drive theelectrode needle 22 to rotate; when the twopressing rods 62 are pressed externally, the two clampingplates 61 can clamp the two opposite sides of thesquare column section 52, so as to limit the rotation of thesquare column section 52, and when the ablation operation handle 21 rotates, the fixing piece has axial displacement to adjust the length of theelectrode needle 22 penetrating out of thecannula unit 1.

In summary, the radiofrequency ablation device of the embodiment, with the above structure, can conveniently realize that theelectrode needle 22 only rotates, and can adjust the length of theelectrode needle 22 penetrating out of thecannula unit 1 without rotating theelectrode needle 22, thereby facilitating use.

EXAMPLE six

This embodiment relates to a radiofrequency ablation device having substantially the same structure as the radiofrequency ablation device described in the fifth embodiment, except that: in this embodiment, the rf ablation device further includes a biopsy needle for alternately penetrating the inner bore of theinner tube 11 with theelectrode needle 22; the biopsy needle may be an existing product, and the structure thereof is not described herein.

The radio frequency ablation device of the embodiment is used for combining the biopsy needle and thecannula unit 1 to perform puncture and biopsy, and then withdrawing the biopsy needle to keep thecannula unit 1; and then theelectrode needle 22 is penetrated into thecannula unit 1, and the medical staff adjusts theelectrode needle 22 according to the fifth embodiment, so that theelectrode needle 22 performs the ablation operation with the expected length, thereby avoiding repeated puncture and reducing the damage to the tissue.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A radio frequency ablation device, comprising:

the sleeve unit comprises an inner pipe and an outer pipe which are fixedly embedded inside and outside, a cavity is defined between the inner pipe and the outer pipe, a through hole is formed in the side wall of one section of the cavity, which is used for extending into the body of a patient, the through hole is used for forming the communication between the cavity and the outside, and an input port communicated with the cavity is formed in one section of the sleeve unit, which is used for being left outside the body of the patient;

the radio frequency ablation assembly comprises an electrode needle, and the electrode needle is used for penetrating in an inner hole of the inner tube;

the liquid supply assembly comprises a liquid storage unit and a heating unit, the heating unit is used for heating liquid in the liquid storage unit, a communicating pipeline is arranged between the liquid storage unit and the input port, and the communicating pipeline is used for supplying the liquid storage unit to convey the liquid in the cavity.

2. The radiofrequency ablation device of claim 1, wherein: the through hole penetrates through the side wall of the inner tube, and the periphery of the electrode needle can block the through hole when the electrode needle penetrates into the inner tube; and an output port is arranged on the other opposite side of the sleeve unit relative to the side provided with the input port, and the output port is used for allowing the liquid flowing into the cavity to flow out.

3. The radiofrequency ablation device of claim 2, wherein: the inner hole of the inner pipe comprises a large-diameter section, a transition section and a small-diameter section which are sequentially connected in series from outside to inside, and the through hole penetrates through the side wall of the small-diameter section.

4. The radiofrequency ablation device of claim 1, wherein: one of the outside of bushing unit serves and is equipped with connecting portion, the radio frequency melts the subassembly and still includes melts operating handle, the electrode needle install in melt on the operating handle, just it is equipped with first linkage unit on the operating handle to melt, first linkage unit with the connection can be dismantled to connecting portion, first linkage unit with when connecting portion are connected, melt operating handle and can accept the outside and order about and drive the electrode needle in rotate in the inner tube.

5. The radiofrequency ablation device of claim 4, wherein: the connecting part comprises a holding section and a connecting section, the holding section is connected to one end of the outside of the sleeve unit in series, the connecting section is connected to one end of the outside of the holding section in series, and the first connecting unit comprises a connecting piece which is rotatably arranged on the ablation operating handle and can be detachably connected with the connecting section.

6. The radiofrequency ablation device of claim 5, wherein: the ablation operation handle is provided with a fixing piece which can penetrate into the holding section, and the electrode needle is fixedly arranged on the fixing piece; a transmission unit is arranged between the ablation operating handle and the fixing piece, and the fixing piece can receive the driving of the rotation of the ablation operating handle and move along the axial direction of the sleeve pipe unit through the transmission of the transmission unit; and a guide unit capable of being matched with or separated from the fixing piece is arranged on the holding section, and when the guide unit is matched with the fixing piece, the guide unit is used for forming guide for the axial movement of the fixing piece along the sleeve unit.

7. The radiofrequency ablation device of claim 6, wherein: the section of the holding section perpendicular to the axial direction of the sleeve unit is square, the guide unit comprises clamping plates arranged on two inner walls of the holding section, one end of each clamping plate is fixedly connected with the inner wall, a pressing rod is arranged on the other end of each clamping plate, the pressing rod penetrates through the corresponding inner wall towards the outer side, and each pressing rod is used for bearing external pressing to enable the two clamping plates to clamp the fixing piece.

8. The radiofrequency ablation device of claim 6, wherein: the ablation operation handle is provided with a mounting hole for the fixing piece to penetrate, and the transmission unit comprises a first external thread and a first internal thread, wherein the first external thread is formed on the periphery of the fixing piece, and the first internal thread is formed on the inner wall of the mounting hole and can be in threaded connection with the first external thread.

9. The radiofrequency ablation device of claim 5, wherein: the inner hole of the connecting section is provided with a second internal thread, and the periphery of the connecting piece is provided with an external thread capable of being in threaded connection with the internal thread.

10. The radiofrequency ablation device of claim 1, wherein: the electrode needle is used for alternately penetrating into the inner hole of the inner tube.

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