A blunt, curved radio frequency cannula needle and radio frequency device

Abstract

The utility model relates to radio frequency treatment field especially blunt head curved radio frequency cannula needle and radio frequency equipment, wherein radio frequency cannula needle includes needle tube, the needle tube has first pipe section and second pipe section who links, the end of second pipe section is blunt head, second pipe section is relatively first pipe section length direction and is set up obliquely. The blunt head curved radio frequency cannula needle of the utility model, through setting up the second pipe section who is oblique to first pipe section, makes the operator to be more convenient to pass through the rotation or the needle tube of pulling and moving to bypass the human body tissue shelter or changes needle tube end direction when needle tube moves in the human body, makes the head end of needle tube can conveniently, accurately aim at the lesion point, can reduce the frequency of repeated puncture, the end of second pipe section is set as blunt head, through the wide head of blunt head can reduce the damage of nerve, muscle, blood vessel etc. that causes the unexpected when needle tube moves in the human body, is favorable to improve the security.

Description

Technical Field

[0001] This utility model relates to the field of radiofrequency therapy, and in particular to a blunt-tipped, curved radiofrequency cannula and radiofrequency device. Background Technology

[0002] Pain, such as trigeminal neuralgia and discogenic pain, significantly impacts patients' quality of life. Pain sensations are transmitted to the brain via pain nerves, and can be eliminated or reduced through radiofrequency ablation of these nerves, thus achieving pain management. Radiofrequency ablation uses specialized equipment and needles to precisely deliver ultra-high-frequency radiofrequency energy to local tissues, thermally coagulating or cutting pain nerves, or modulating them to treat pain disorders. This minimally invasive treatment method is divided into standard radiofrequency (thermal coagulation) mode and pulsed radiofrequency mode, and radiofrequency ablation is widely used in clinical surgery.

[0003] Currently, the radiofrequency cannulas used in radiofrequency pain interventional treatment are mostly straight radiofrequency cannulas. After being inserted into the human body to reach the target position, its end can only move along the extension line of the puncture direction. When it is necessary to change the orientation of the end, it is necessary to re-puncture and reposition, which will cause repeated damage to the normal nerves or muscle tissues around the patient and increase the operation time many times over. Utility Model Content

[0004] The purpose of this invention is to overcome the problem in the prior art that the end of a straight radiofrequency cannula can only move along the extension line of the puncture direction after it is inserted into the human body and reaches the target position, and that it is necessary to re-puncture and reposition when the end orientation needs to be changed, so as to provide a blunt-tipped curved radiofrequency cannula needle and radiofrequency device.

[0005] In a first aspect, the present invention provides a blunt-tipped, bent radiofrequency cannula needle, comprising a needle tube having a first tube segment and a second tube segment connected to each other, the end of the second tube segment being blunt-tipped, and the second tube segment being inclined relative to the length direction of the first tube segment.

[0006] The blunt-tipped, curved radiofrequency cannula of this invention, by setting a second segment that is inclined relative to the first segment, allows the operator to more easily rotate or manipulate the cannula to bypass obstructions from human tissue or change the orientation of the cannula tip when it moves within the body. This makes it easier and more accurate to align the cannula tip with the lesion, reducing the frequency of repeated punctures. The blunt tip of the second segment, with its wide head, reduces the risk of unexpected damage to nerves, muscles, and blood vessels during the movement of the cannula within the body, thus improving safety.

[0007] Preferably, the second pipe segment and the first pipe segment have an included angle α, where α ≤ 30°.

[0008] Preferably, the first pipe segment and the second pipe segment are integrally formed.

[0009] Preferably, the outer surface of the blunt tip is a hemispherical surface, and the edge of the blunt tip smoothly transitions to the outer surface of the needle.

[0010] Preferably, the end of the first tube segment away from the second tube segment is connected to a needle hub, the needle tube is embedded in the needle hub, the inside of the needle tube has a cavity, the needle hub is provided with an insertion port, and the insertion port is connected to the cavity.

[0011] Preferably, the needle tube includes an insulating section and an exposed section divided along its length, the insulating section being connected to the needle hub, the outer surface of the insulating section being covered with an insulating layer, and the exposed section extending beyond the insulating layer.

[0012] Preferably, the length of the exposed section is L, where 3mm ≤ L ≤ 15mm.

[0013] Preferably, the insulating layer is made of a polymer material.

[0014] More preferably, the insulating layer is made of either Teflon or polyester.

[0015] Preferably, the second pipe section has an opening on its side wall, the opening connecting the outside to the pipe cavity, and the opening is located on the exposed section.

[0016] Preferably, the distance from the edge of the opening to the end of the second pipe segment is e, where e ≤ 5 mm.

[0017] Preferably, the aperture of the opening is ≤1mm.

[0018] Preferably, the radiofrequency cannula also includes a liner that detachably engages with the cannula, the liner being able to extend into the lumen.

[0019] Preferably, one end of the liner is connected to a liner seat, the liner can extend into the lumen from the insertion port, and the liner and liner seat can block the insertion port.

[0020] Preferably, the core support is provided with a protrusion, and the needle support is provided with a connecting groove, wherein the protrusion engages with the connecting groove.

[0021] Preferably, the radio frequency cannula needle further includes a radio frequency electrode, which can extend into the lumen, and the end of the radio frequency electrode can extend to the second tube segment.

[0022] Preferably, the radio frequency electrode is connected to the handle, the end of the needle hub away from the needle tube is provided with a lower groove, and the end of the handle near the radio frequency electrode can be sealed and inserted into the lower groove.

[0023] In a second aspect, the present invention provides a radio frequency device, including a blunt-tipped, bent radio frequency cannula as described above.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] The blunt-tipped, curved radiofrequency cannula of this invention, by setting a second segment that is inclined relative to the first segment, allows the operator to more easily rotate or manipulate the cannula to bypass obstructions from human tissue or change the orientation of the cannula tip when it moves within the body. This makes it easier and more accurate to align the cannula tip with the lesion, reducing the frequency of repeated punctures. The blunt tip of the second segment, with its wide head, reduces the risk of unexpected damage to nerves, muscles, and blood vessels during the movement of the cannula within the body, thus improving safety. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the needle tube and needle seat described in this utility model;

[0027] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0028] Figure 3 This is a schematic diagram showing the dimensions of the second pipe section and the opening of this utility model;

[0029] Figure 4 This is a cross-sectional schematic diagram of the needle tube and needle hub described in this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the liner and liner seat described in this utility model;

[0031] Figure 6 This is a schematic diagram showing the connection between the core support and the needle support of this utility model;

[0032] Figure 7 for Figure 6 Enlarged view of section B in the middle;

[0033] Figure 8 for Figure 6 A cross-sectional view;

[0034] Figure 9 for Figure 8 Enlarged view of section C;

[0035] Figure 10 This is a schematic diagram of the structure of the radio frequency electrode and the handle described in this utility model;

[0036] Figure 11 This is a schematic diagram showing the connection between the handle and the needle holder described in this utility model;

[0037] Figure 12for Figure 11 A partial sectional view of section D in the middle;

[0038] Figure 13 This is a partial cross-sectional view of the handle and needle holder described in this utility model;

[0039] Figure 14 This is a schematic diagram of the steps in Example 4. Figure 1 ;

[0040] Figure 15 This is a schematic diagram of the steps in Example 4. Figure 2 ;

[0041] Figure 16 This is a schematic diagram of the steps in Example 4. Figure 3 .

[0042] Marked in the image:

[0043] 1-Syringe;

[0044] 11-First pipe section; 12-Second pipe section; 13-Blunt end; 14-Pipe lumen; 15-Insulation layer; 16-Opening;

[0045] 2-Pin hub;

[0046] 21-Insert port; 22-Connecting groove; 23-Lower groove;

[0047] 3- Liner;

[0048] 4- Liner core seat;

[0049] 41-Protrusion;

[0050] 5-RF electrode;

[0051] 6-Handle;

[0052] 7-Mastoid;

[0053] 8-Vertebral foramen;

[0054] 9-Vertebral body. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0056] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0057] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0058] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0059] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0060] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0061] Example 1

[0062] Common radiofrequency cannulas have a straight structure with a beveled needle tip at the end. The needle tip can be used to pierce the skin, allowing the radiofrequency cannulas to enter the human body. In actual use, the above-mentioned radiofrequency cannulas often have the problem that the needle tip cannot avoid the bone obstruction, making it difficult for the end of the radiofrequency cannulas to reach some lesion points, and the radiofrequency energy cannot be applied accurately. In this case, it is necessary to re-puncture and reposition, but re-puncture will cause repeated damage to the normal nerves or muscle tissues around the patient and increase the operation time exponentially.

[0063] To solve the above problems, such as Figures 1 to 4 As shown, this embodiment provides an RF sleeve, including a first tube segment 11 and a second tube segment 12 connected to each other, wherein the second tube segment 12 is inclined relative to the length direction of the first tube segment 11.

[0064] The first tube segment 11 and the second tube segment 12 are arranged along the length of the radiofrequency sheath. The second tube segment 12 can be the part that first enters the human body in actual use. The end of the second tube segment 12 is the head end of the radiofrequency sheath, and the end of the first tube segment 11 away from the second tube segment 12 is the tail end of the radiofrequency sheath. By tilting the second tube segment 12 relative to the first tube segment 11, when the head end of the radiofrequency sheath moves in the human body, the radiofrequency sheath can be rotated around the axis of the first tube segment 11, or the radiofrequency sheath can be slightly turned with the sheath body corresponding to the skin as the base point, so that the second tube segment 12 can bypass the obstruction in front or change the orientation of the head end, thereby making it easy to align the head end with the lesion point.

[0065] Considering that the radio frequency electrode 5 needs to be inserted inside the radio frequency sleeve, an excessively large angle between the first tube segment 11 and the second tube segment 12 will increase the difficulty of inserting the radio frequency electrode 5, and an excessively large angle will increase the difficulty of moving the radio frequency sleeve inside the human body. Preferably, the second tube segment 12 and the first tube segment 11 have an angle α, where α ≤ 30°, more preferably, 10° ≤ α ≤ 20°, and even more preferably, α = 15°.

[0066] Preferably, the first pipe section 11 and the second pipe section 12 are integrally formed, and the first pipe section 11 and the second pipe section 12 may be made of stainless steel.

[0067] Those skilled in the art will understand that the obliquely cut needle tip has a relatively sharp edge, which can easily cause unexpected damage to nerves, muscles, blood vessels, etc. when moving in the human body. To solve this problem, preferably, the end of the second tube segment 12 is a blunt tip 13, and the surface of the blunt tip 13 is a smooth arc surface. When the blunt tip 13 comes into contact with nerves, muscles, blood vessels, and other tissues, it can use its wide and smooth head to push or push away human tissues, thereby causing less damage to human tissues, thus improving the safety of the operation and reducing the requirements for the surgeon's experience.

[0068] More preferably, the outer surface of the blunt tip 13 is a hemispherical surface, and the edge of the blunt tip 13 smoothly transitions with the outer surface of the needle tube 1.

[0069] Example 2

[0070] This embodiment provides a blunt-tipped, bent radiofrequency cannula needle, including a needle tube 1, which is the radiofrequency cannula as described in Embodiment 1.

[0071] The blunt-tipped, curved radiofrequency cannula described in this embodiment, by setting a second tube segment 12 that is inclined relative to the first tube segment 11, allows the operator to more easily rotate or manipulate the needle tube 1 to bypass human tissue obstructions or change the orientation of the needle tip when it moves within the human body. This makes it easier and more accurate to align the needle tip with the lesion, reducing the frequency of repeated punctures. The end of the second tube segment 12 is set as a blunt tip 13. The wide head of the blunt tip 13 can reduce unexpected damage to nerves, muscles, blood vessels, etc., when the needle tube 1 moves within the human body, thus improving safety.

[0072] Preferably, the junction of the first pipe section 11 and the second pipe section 12 is an arc-shaped bend.

[0073] In a preferred embodiment, the length of the second tube segment 12 is less than the length of the first tube segment 11. For example, the length of the second tube segment 12 is 3mm-10mm, and the length of the first tube segment 11 is determined according to the usage requirements, such as 50mm-200mm. From the appearance, the second tube segment 12 is a raised end of the needle tube 1.

[0074] In some embodiments, the end of the first tube segment 11 away from the second tube segment 12 is connected to a needle seat 2, the needle tube 1 is embedded in the needle seat 2, the inside of the needle tube 1 has a cavity 14, and the needle seat 2 is provided with an insertion port 21, which is connected to the cavity 14.

[0075] Preferably, the lumens 14 of the first pipe section 11 and the second pipe section 12 are connected, the end of the first pipe section 11 away from the second pipe section 12 has a pipe opening, the pipe opening is connected to the lumens 14 and the outside, and the insertion port 21 is connected to the pipe opening.

[0076] Preferably, to meet the sealing requirements, an installation groove adapted to the shape of the end of the needle tube 1 can be provided on the needle holder 2. The tail end of the needle tube 1 is embedded in the installation groove and sealed with the groove wall. An insertion port 21 can be provided at the rear end of the needle holder 2. The insertion port 21 is connected to the above-mentioned installation groove and is connected to the cavity 14 of the needle tube 1. The radio frequency electrode 5 and the like can enter the cavity 14 from the insertion port 21.

[0077] Preferably, to meet insulation requirements, the outer surface of the needle tube 1 is covered with an insulating layer 15, and the tip of the needle tube 1 extends out of the insulating layer 15 to allow radio frequency energy to pass through. The insulating layer 15 is formed by overlay. One overlay method is to uniformly cover the surface of the needle tube 1 with molten insulating material and cool it to set. Another overlay method is to put an insulating heat shrink tube on the needle tube 1 and then heat shrink it to set.

[0078] The coating method can improve the uniformity and firmness of the insulating layer 15, and help reduce the probability of peeling and falling off the insulating layer 15. The insulating layer 15 can be made of polymer materials, preferably Teflon or polyester. The part of the needle tube 1 with the insulating layer 15 is defined as the insulating section, and the part of the needle tube 1 with metal exposed above the insulating layer 15 is the exposed section. In this embodiment, the insulating section and the exposed section are arranged along the length of the needle tube 1. The insulating section is connected to the needle seat 2 to prevent current diffusion and reduce the risk of short circuit. The exposed section is close to the tip to allow radio frequency energy to pass through. The operator can select a needle tube 1 with an appropriate exposed section length according to the actual size of the area to be ablated.

[0079] More preferably, the end of the insulating layer 15 near the blunt tip 13 is provided with a smooth taper, so that the outer surface of the insulating layer 15 and the outer surface of the needle tube 1 are smoothly transitioned.

[0080] More preferably, such as Figure 3 As shown, the length of the exposed section is L, 3mm≤L≤15mm, where L is the dimension on the central axis of needle tube 1.

[0081] Specifically, the insulating layer 15 may be disposed on the outside of the first pipe section 11, and the second pipe section 12 and the bent section extend beyond the insulating layer 15.

[0082] In order for the needle 1 with a blunt tip 13 to be able to aspirate or inject liquid, preferably, at least one opening 16 is provided on the side wall of the second tube section 12, the opening 16 communicating with the outside and the lumen 14, and the opening 16 is located on the exposed section.

[0083] More preferably, such as Figure 3 As shown, the distance from the edge of the opening 16 to the end of the second pipe section 12 is e, where e ≤ 5 mm, and the aperture of the opening 16 is preferably less than or equal to 1 mm.

[0084] Those skilled in the art will understand that the needle tube 1 is a tubular structure with an internal lumen 14. The presence of the lumen 14 reduces the rigidity of the needle tube 1 to some extent, making it prone to bending or deformation when moving inside the body, especially at the junction of the first segment 11 and the second segment 12. Bending or deformation of the needle tube 1 not only affects the operation but also causes additional damage to the patient. To solve the above problems, the radiofrequency cannula needle described in this embodiment is also provided with a liner 3 that is detachably fitted with the needle tube 1. The liner 3 can extend into the lumen 14 from the insertion port 21 to increase the rigidity of the needle tube 1, thereby reducing the probability of accidental bending of the needle tube 1.

[0085] The liner 3 can be a needle-like structure made of stainless steel. The outer diameter of the liner 3 is smaller than the inner diameter of the lumen 14 and the diameter of the insertion port 21, so that it can be inserted into the lumen 14.

[0086] Preferably, the liner 3 has a certain degree of flexibility, and the end of the liner 3 can extend to the second pipe section 12 to increase the rigidity at the junction of the first pipe section 11 and the second pipe section 12.

[0087] Preferably, such as Figures 5 to 9 As shown, one end of the liner 3 is provided with a liner seat 4. The liner 3 and the liner seat 4 can block the insertion port 21 to meet the sealing requirements.

[0088] More preferably, the end of the needle holder 2 away from the needle tube 1 is provided with a lower groove 23, the insertion port 21 is located at the bottom of the lower groove 23, the core holder 4 is provided with a frustum, the frustum can be inserted into the lower groove 23 and fit tightly with the lower groove 23, so as to fix and connect the core holder 4 and the needle holder 2 and seal the lower groove 23 and the insertion port 21. The core 3 protrudes from the top surface of the frustum, and the edge of the top surface of the frustum can be provided with an arc transition.

[0089] To ensure that the core support 4 and the needle seat 2 can be securely fastened for the operator's convenience, preferably, the core support 4 is provided with a protrusion 41, and the side wall of the needle seat 2 is provided with a connecting groove 22, with the protrusion 41 engaging with the connecting groove 22.

[0090] In one implementation, such as Figure 7 As shown, the protrusion 41 can be two cylindrical bodies protruding from the surface of the liner seat 4, with a gap between the two cylindrical bodies. The connecting groove 22 can be a groove provided on the side wall of the needle seat 2. The two cylindrical bodies can be squeezed in opposite directions to be inserted into the connecting groove 22, and the restoring force is used to engage with the connecting groove 22.

[0091] In another embodiment, the protrusion 41 can be a connecting post that can be elastically deformed, and the connecting post is pressed and fixed in the connecting groove 22.

[0092] To achieve radiofrequency treatment, the radiofrequency cannula needle described in this embodiment also includes a radiofrequency electrode 5. The radiofrequency electrode 5 is detachably connected to the needle tube 1. The radiofrequency electrode 5 can enter the lumen 14 from the insertion port 21. The end of the radiofrequency electrode 5 can extend to the second tube segment 12 and approach the tip of the needle tube 1.

[0093] like Figure 10 and Figure 12 As shown, the radiofrequency electrode 5 has a slender structure, and its end can extend to a position close to the blunt tip 13. Radiofrequency energy is emitted through the radiofrequency electrode 5 to achieve radiofrequency ablation treatment. Further, as... Figure 11 and Figure 13 As shown, the radio frequency electrode 5 is mounted on the handle 6. The end of the handle 6 near the radio frequency electrode 5 can be inserted into the lower groove 23 and fit tightly with the lower groove 23 to fix the handle 6 and the needle seat 2 and seal the lower groove 23 and the insertion port 21.

[0094] Example 3

[0095] This embodiment provides a radio frequency device, including a blunt-tipped, bent radio frequency cannula needle as described in Embodiment 2, specifically including a needle tube 1, a liner 3, and a radio frequency electrode 5.

[0096] The liner 3 can be inserted into the lumen 14 of the needle tube 1, and the radio frequency electrode 5 can be inserted into the lumen 14 of the needle tube 1.

[0097] Preferably, the end of the needle tube 1 is provided with a needle seat 2, the end of the liner 3 is provided with a liner seat 4, and the end of the radio frequency electrode 5 is provided with a handle 6. One end of the handle 6 is connected to an electric wire, and the other end is connected to the radio frequency electrode 5. The needle seat 2 and the liner seat 4 can be sealed and plugged into each other, and the needle seat 2 and the handle 6 can be sealed and plugged into each other.

[0098] Example 4

[0099] This embodiment provides a method of use to guide the use of the radiofrequency cannula needle as described in Embodiment 2, including the following steps:

[0100] S1. Locating the target: The surgeon determines the target to be ablated in advance based on the patient's physiological indicators and X-ray imaging data, and marks it accordingly;

[0101] S2. Skin puncture: The surgeon uses a percutaneous needle to puncture the skin near the patient's target point and places an indwelling needle of appropriate size to establish a percutaneous puncture channel, or directly uses a scalpel to cut open the patient's skin and tissue;

[0102] S3. Needle Insertion: The fitted needle tube 1 and liner 3 pass through the channel established in step S2, through the patient's skin and tissue, to reach the target location. If bone is encountered during puncture, the operator can adjust the advance angle of the radiofrequency cannula to bypass the bone. The position can be confirmed multiple times with X-rays during needle insertion. Figure 14As shown;

[0103] S4. Place the radiofrequency electrode: After the needle 1 reaches the lesion location, remove the liner 3. Figure 15 As shown, insert the matching radio frequency electrode 5 through the insertion port 21 into the needle tube 1 until the handle 6 matches the needle hub 2, as follows. Figure 16 As shown;

[0104] S5. Radiofrequency ablation: Delivering radiofrequency energy to the patient's target area for pain treatment;

[0105] S6. End of surgery: Remove radiofrequency electrode 5, inject appropriate anti-inflammatory drugs into the patient through insertion port 21 if necessary, remove needle 1, and provide appropriate care to the patient. The surgery is now complete.

[0106] Figures 14 to 16 The diagram illustrates the steps of radiofrequency ablation of the lumbar spine, which includes the mastoid process 7, the foramen 8, and the vertebral body 9.

[0107] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A blunt-tipped, bent radiofrequency cannula, characterized in that, Includes a needle tube (1), which has a first tube segment (11) and a second tube segment (12) connected to each other. The end of the second tube segment (12) is a blunt tip (13), and the second tube segment (12) is inclined relative to the length direction of the first tube segment (11).

2. The blunt-tipped, bent radiofrequency cannula according to claim 1, characterized in that, The second pipe segment (12) and the first pipe segment (11) have an included angle α, where α ≤ 30°.

3. The blunt-tipped, bent radiofrequency cannula according to claim 1, characterized in that, The first pipe section (11) and the second pipe section (12) are integrally formed.

4. The blunt-tipped, bent radiofrequency cannula according to claim 1, characterized in that, The outer surface of the blunt tip (13) is a hemispherical surface, and the edge of the blunt tip (13) smoothly transitions to the outer surface of the needle tube (1).

5. The blunt-tipped, bent radiofrequency cannula according to any one of claims 1-4, characterized in that, The first tube segment (11) is connected to a needle seat (2) at one end away from the second tube segment (12). The needle tube (1) is embedded in the needle seat (2). The needle tube (1) has a cavity (14) inside. The needle seat (2) is provided with an insertion port (21). The insertion port (21) is connected to the cavity (14).

6. The blunt-tipped, bent radiofrequency cannula according to claim 5, characterized in that, The needle tube (1) includes an insulating section and an exposed section divided along its length. The insulating section is connected to the needle hub (2). The outer surface of the insulating section is covered with an insulating layer (15). The exposed section extends out of the insulating layer (15).

7. The blunt-tipped, bent radiofrequency cannula according to claim 6, characterized in that: The length of the exposed section is L, where 3mm ≤ L ≤ 15mm; And / or, the insulating layer (15) is made of either Teflon or polyester; And / or, the second pipe section (12) has an opening (16) on its side wall, the opening (16) connecting the outside and the pipe cavity (14), the opening (16) being located on the exposed section; the distance between the edge of the opening (16) and the end of the second pipe section (12) is e, e≤5mm, and the aperture of the opening (16)≤1mm.

8. The blunt-tipped, bent radiofrequency cannula according to claim 5, characterized in that, It also includes a liner (3) that is detachably coupled to the needle tube (1), the liner (3) being able to extend into the lumen (14). One end of the liner (3) is connected to the liner seat (4), the liner (3) can extend into the lumen (14) from the insertion port (21), and the liner (3) and the liner seat (4) can block the insertion port (21). The core seat (4) is provided with a protrusion (41), and the needle seat (2) is provided with a connecting groove (22). The protrusion (41) and the connecting groove (22) are engaged.

9. The blunt-tipped, bent radiofrequency cannula according to claim 8, characterized in that, It also includes a radio frequency electrode (5), which can extend into the lumen (14), and the end of the radio frequency electrode (5) can extend to the second tube segment (12). The radio frequency electrode (5) is connected to the handle (6). The end of the needle seat (2) away from the needle tube (1) is provided with a lower groove (23). The end of the handle (6) near the radio frequency electrode (5) can be sealed and inserted into the lower groove (23).

10. A radio frequency device, characterized in that, Including the blunt-tipped, bent radiofrequency cannula as described in any one of claims 1-9.

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