Radiofrequency ablation device

Abstract

The present application relates to a kind of radio frequency ablation equipment, it includes electrode, balloon and delivery tube;The electrode is in net shape, with the contraction state of being shrunk together when being constrained, and the expansion state of being automatically expanded outward when losing constraint, which is connected with the external electrical connector by electrode lead;The balloon is located in the inside of the electrode, and pushes against the electrode when in the inflation state;The delivery tube includes outer tube and inner tube, and the electrode lead is located between the outer tube and inner tube, and the delivery tube further includes balloon catheter communicated with one end of the balloon, which is located in the inside of the inner tube and has gap between the inner tube.When electrode is delivered to target position, it can be automatically unfolded and form good abutment effect with the inner wall of bronchus by the support of balloon.

Description

Technical Field

[0001] This invention relates to the technical field of tissue ablation, and more specifically to a radiofrequency ablation device. Background Technology

[0002] Chronic obstructive pulmonary disease (COPD) is a general term for diseases that cause airway obstruction, such as chronic bronchitis and / or emphysema. This disease is chronic, and the airway obstruction is usually permanent or irreversible, and can further develop into common chronic diseases such as pulmonary heart disease and / or respiratory failure.

[0003] The main focus of COPD treatment is to alleviate current symptoms and reduce future risks. Traditional treatments involve controlling the living environment, and using medication, oxygen therapy, and ventilation support. In severe cases, lung resection surgery may be necessary.

[0004] Using medication to prevent and control symptoms can indeed reduce the frequency of acute and major illnesses, thereby improving exercise endurance and quality of life. However, patients need to take medication for a long time, which puts a lot of physical and financial pressure on them.

[0005] Surgical treatments, such as bullectomy, lung volume reduction surgery (removal of part of the lung tissue), bronchoscopic lung volume reduction surgery, and lung transplantation, can alleviate the suffering of patients who have to take medication for a long time and reduce their financial burden. However, these procedures are highly invasive and patients have to endure a lot of pain during treatment.

[0006] In summary, existing treatments all require patients to endure considerable suffering, such as the pain of long-term medication and the pain caused by extensive surgical trauma.

[0007] The prior art discloses a system, apparatus and method for treating tissue and controlling stenosis, including an ablation component, one of which includes a capsule and a corrugated electrode attached to the outside of the capsule.

[0008] During operation, air is inflated into the capsule, causing it to expand and unfold the wave-shaped electrode attached to the outside of the capsule, so that it can come into contact with the lesion tissue on the inner wall of the bronchus and perform radiofrequency ablation.

[0009] However, this type of ablation component has the following drawbacks: because the wave-shaped electrode is attached to the outside of the balloon, it cannot automatically unfold to contact the inner wall of the bronchus. It needs the support of the balloon to make contact with the inner wall of the bronchus and thus achieve ablation of the diseased tissue. Summary of the Invention

[0010] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the electrodes cannot automatically deploy and abut against the inner wall of the bronchus, thereby providing a radiofrequency ablation device in which the electrodes can automatically deploy and abut against the inner wall of the bronchus.

[0011] To address the aforementioned technical problems, this invention provides a radiofrequency ablation device, comprising:

[0012] The electrodes, which are mesh-like, have a contracted state when constrained and an expanded state when unconstrained, and are connected to an external electrical connector via electrode leads.

[0013] A balloon, located inside the electrode, pushes against the electrode when inflated;

[0014] The delivery tube includes an outer tube and an inner tube, with the electrode lead located between the outer tube and the inner tube. The delivery tube also includes a balloon catheter communicating with one end of the balloon, which is located inside the inner tube and has a gap with the inner tube.

[0015] Optionally, the electrode is formed by cutting a shape memory alloy.

[0016] Optionally, the electrode has an ablation zone located on a raised portion of the electrode.

[0017] Optionally, the entire electrode constitutes the ablation zone.

[0018] Optionally, the free end of the electrode is extended outward.

[0019] Optionally, the distance between the free end of the electrode and the central axis of the electrode is less than the distance between the raised portion and the central axis of the electrode or less than the radius of the bronchus.

[0020] Optionally, when the balloon inflates, the diameter of the part of the balloon that contacts the electrode is larger than the diameter of the part of the electrode that is contacted by the balloon, which is suitable for pushing the electrode against the inner wall of the bronchus.

[0021] Optionally, the raised portion includes the end of the electrode, and the ablation zone is located at the end of the electrode.

[0022] Optionally, the surface of the balloon is provided with micropores.

[0023] Optionally, the balloon catheter has an inlet lumen and an outlet lumen, the inlet lumen being adapted to introduce coolant into the balloon, and the outlet lumen being adapted to provide a channel for the coolant to flow out of the balloon.

[0024] Optionally, the radiofrequency ablation device further includes a sensor disposed on the electrode, the sensor being connected to the electrical connector via a sensor lead located between the outer tube and the inner tube.

[0025] Optionally, the radiofrequency ablation device further includes a negative electrode plate; a radiofrequency device electrically connected to the negative electrode plate and connected to the electrical connector; a pressure pump connected to the balloon connector via a first conduit; a circulation pump connected to the coolant connector via a second conduit; and a bronchial endoscope device including a bronchial endoscope, an endoscopic visualization device, and a suction device, wherein the bronchial endoscope has a working cavity suitable for the passage of the delivery tube.

[0026] The technical solution of this invention has the following advantages:

[0027] 1. The radiofrequency ablation device provided in this embodiment of the invention has an ablation zone located on the raised part of the electrode. Compared with setting the ablation zone in other parts, the ablation zone has a tighter contact with the inner wall of the bronchus, which can improve the ablation effect.

[0028] 2. The radiofrequency ablation device provided in this embodiment of the invention includes the end of the electrode in the raised portion, and the ablation zone is located at the end of the electrode and in the raised portion, which can reduce the size of the electrode, facilitate the electrode to pass through the bronchus, and improve the electrode's passage performance.

[0029] 3. In the radiofrequency ablation device provided in this embodiment of the invention, the free end of the electrode extends outward, which can prevent the balloon in a contracted state from being punctured by the free end of the electrode during the process of entering the electrode or during the movement of the balloon relative to the electrode, thus preventing it from failing.

[0030] 4. In the radiofrequency ablation device provided in this embodiment of the invention, the distance between the free end of the electrode and the central axis of the electrode is less than the distance between the raised portion and the central axis of the electrode or less than the radius of the bronchus. This design can prevent the free end of the electrode from puncturing the inner wall of the bronchus during the deployment of the electrode and / or balloon.

[0031] 5. The radiofrequency ablation device provided in this embodiment of the invention has its electrode leads and sensor leads located between the outer tube and the inner tube. This design can avoid the sensor leads and electrode leads being pulled during use, resulting in poor contact between the sensor leads and / or between the electrode leads and the electrode, which would affect the surgical effect. At the same time, it can make the appearance of the delivery tube neat and easy to store and organize.

[0032] 6. In the radiofrequency ablation device provided in this embodiment of the invention, the electrodes are not attached to the balloon. Therefore, during the delivery process, the balloon can be delivered to the target position first, and then the electrodes can be delivered to the target position. In this way, it is easier for the balloon to pass through the bronchus. That is, for the same size bronchus, the size of the balloon that can pass through can be larger, thereby increasing the support force of the balloon on the electrodes. At the same time, more coolant can be injected into the balloon to improve its cooling effect on the electrodes.

[0033] 7. The radiofrequency ablation device provided in this embodiment of the invention is mesh-like, having a contracted state when constrained and an expanded state when unconstrained. When the electrode is delivered to the target position, it can automatically expand and contact the inner wall of the bronchus without relying on balloon support, thus avoiding balloon failure and the inability to perform ablation.

[0034] 8. The radiofrequency ablation device provided in this embodiment of the invention has an anti-scratch structure at the free end of the electrode, which can prevent the free end from damaging the balloon when the balloon is retracted.

[0035] 9. The radiofrequency ablation device provided in this embodiment of the invention has small holes on each anti-scratch structure at the free end of the electrode. A connecting wire passes through adjacent small holes in sequence to form a limiting ring, which can prevent the balloon from changing shape after contraction in the body, such as forming a sheet, so that part of the balloon may enter the free end of the electrode and get stuck between the anti-scratch structures of adjacent electrodes. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the radiofrequency ablation device according to an embodiment of the present invention;

[0038] Figure 2 This is a partial structural schematic diagram of the radiofrequency ablation device according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the interaction between the balloon and the electrode in the radiofrequency ablation device according to an embodiment of the present invention;

[0040] Figure 4 This is a cross-sectional view of the conveying pipe at position A-A according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the electrode embodiment one of the present invention;

[0042] Figure 6 This is a schematic diagram of the electrode implementation method two of the present invention;

[0043] Figure 7 This is a schematic diagram of the third embodiment of the electrode of the present invention;

[0044] Figure 8 This is a schematic diagram of the external structure of the balloon and balloon catheter according to an embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram of the internal structure of the balloon and balloon catheter in Embodiment 1 of the present invention;

[0046] Figure 10 This is a schematic cross-sectional view of the balloon catheter at position B-B according to an embodiment of the present invention;

[0047] Figure 11 This is a schematic diagram of the internal structure of the balloon and balloon catheter in Embodiment 2 of the present invention;

[0048] Figure 12 This is a schematic cross-sectional view of the balloon catheter at position C-C according to an embodiment of the present invention;

[0049] Figure 13 This is a schematic diagram of the external structure of a balloon with micropores according to an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Electrode; 10. End; 11. Ablation zone; 15. Raised area; 16. Tail end; 17. Free end; 18. Scratch-resistant structure; 19. Limiting ring; 12. Balloon; 120. Micropore; 121. Small hole; 122. Tip; 13. Inner wall of bronchus; 2. Bronchoscope; 20. Endoscopic visualization device; 21. Suction device; 3. Sensor; 4. Delivery tube; 40. Outer tube; 41. Inner tube; 42. Balloon catheter; 42a. Inlet chamber; 42b. Outlet chamber; 44. Electrode lead; 45. Sensor lead; 5. Handle; 50. Balloon connector; 51. Electrical connector; 52. Coolant connector; 6. Circulation pump; 60. First connecting pipe; 61. Second connecting pipe; 7. Radiofrequency device; 8. Negative electrode plate; 9. Pressure pump. Detailed Implementation

[0052] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] like Figures 1 to 13 As shown, this embodiment provides a radiofrequency ablation device for ablating diseased tissue in the human body. Specifically, in this embodiment, it is used to ablate tissue on the bronchial inner wall 13 that is diseased.

[0057] The radiofrequency ablation device includes an electrode 1, a balloon 12 for supporting the electrode, and a sensor 3 disposed on the electrode 1.

[0058] like Figure 5 As shown, electrode 1 is formed into a mesh structure by laser cutting and heat treatment of a shape memory alloy. Electrode 1 can also be in other shapes, which are not limited here. The shape memory alloy can be a nickel-titanium alloy, or other alloys with shape memory function.

[0059] Of course, electrode 1 can also use a non-metallic material as a framework, and conductive material is arranged on the framework to form an ablation zone 11. The ablation zone 11 can be set independently or interconnected, and can be sheet-shaped, ring-shaped or other forms. In this embodiment, the ablation zone 11 is located at the raised part 15 of electrode 1. The ablation zone 11 can be controlled by the device alone to achieve the purpose of circumferential ablation or single-point ablation.

[0060] Electrode 1 has a contracted state where it contracts together when constrained, and an expanded state where it automatically expands outward when unconstrained, thus, as Figure 1As shown, when electrode 1 reaches the target position, it can automatically deploy and abut against the inner wall 13 of the bronchus without the need for a support device to open it. Therefore, this design simplifies the radiofrequency ablation equipment using this electrode. Of course, electrode 1 in this embodiment can also be used to perform radiofrequency ablation on other tissues of the human body, and this is not a limitation.

[0061] like Figure 5 As shown, this is one embodiment of electrode 1, which is oval-shaped. Multiple ablation zones 11 are formed on the raised portion 15 of electrode 1. Compared to arranging the ablation zones 11 outside the raised portion 15, arranging the ablation zones 11 on the raised portion 15 of electrode 1 increases the contact effect between the ablation zones 11 and the bronchial wall 13. The design of multiple ablation zones 11 facilitates multiple points of contact with the bronchial wall 13, thereby ablating multiple lesions.

[0062] In this embodiment, the free end 17 of the electrode 1 is outwardly extended and smooth. This design prevents the balloon 12 from being punctured by the free end 17 of the electrode 1 during the insertion of the balloon 12 into the electrode 1 or during relative movement between the balloon 12 and the electrode 1. The distance between the free end 17 of the electrode 1 and the central axis of the electrode 1 is less than the distance between the raised portion 15 and the central axis of the electrode 1, or the distance between the free end 17 of the electrode 1 and the central axis of the electrode 1 is less than the radius of the bronchial inner wall 13. This prevents the bronchial inner wall 13 from being scratched by the free end 17 of the electrode 1 during the deployment of the electrode 1 and / or the balloon 12.

[0063] like Figure 13 As shown, in another embodiment of electrode 1, the free end 17 of electrode 1 is no longer in an outward state, but in a contracted state, and several anti-scratch structures 18 are provided on the free end 17. These structures can be smooth spheres or arc-shaped blocks integrally formed with electrode 1 or separately formed. The anti-scratch structures 18 can also be rubber caps directly set on the free end 17. The function of the anti-scratch structures 18 is to prevent the free end 17 from damaging the balloon 12 when the balloon 12 retracts. Each anti-scratch structure 18 has a small hole (not marked) in the center. A flexible connecting wire passes through the small holes on adjacent anti-scratch structures 18 to form a limiting ring 19, which restricts the balloon 12 inside the electrode 1, preventing the balloon 12 from changing shape after contraction in the body, such as forming a sheet, so that part of the balloon 12 may enter the free end 17 of electrode 1 and get stuck between the anti-scratch structures 18 of adjacent electrodes 1. The connecting wire is preferably made of high molecular weight polyethylene material, but other materials can also be used.

[0064] like Figure 6As shown, this is a second embodiment of electrode 1, which is lotus-shaped. The raised portion 15 of electrode 1 includes the end 10 of electrode 1. The ablation zone 11 is located at the end 10 of electrode 1. The end 10 is more outwardly flared than other parts of electrode 1, so that after electrode 1 enters the bronchus, the ablation zone 11 located at the end 10 can better abut against the inner wall 13 of the bronchus. Since the ablation zone 11 is located on the end 10 of electrode 1 and is located at the raised portion, compared with electrode 1 in embodiment one, the size of electrode 1 can be reduced, which facilitates the passage of electrode 1 through the bronchus and improves the passage performance of electrode.

[0065] Of course, the ablation zone 11 can also be set at any part of the electrode 1, and the length of the ablation zone 11 on the electrode 1 can be any length.

[0066] In another embodiment, the entire electrode 1 constitutes an ablation zone 11, which can ablate a relatively large amount of lesion tissue at one time. It can also simplify the manufacturing process of the electrode 1. Furthermore, the electrode 1 only needs one electrode lead to be connected to an external device. Moreover, compared to setting too many ablation zones 11, the entire electrode 1 constitutes an ablation zone 11, which can avoid the lesion tissue corresponding to the failed ablation zone 11 on the bronchus not being ablated due to the failure of a certain ablation zone 11.

[0067] The portion of electrode 1, excluding the ablation zone 11, is coated with an insulating layer to prevent radiofrequency energy leakage or dispersion, and also to prevent damage to other non-lesion tissues. The insulating layer can be formed by spraying or dipping, can be bonded, or can be any other existing arrangement.

[0068] When not in use, the balloon 12 is in a contracted state; when in use, it is in an inflated state. Inflation is typically achieved by inflating the balloon 12 with air, but it can also be achieved by injecting coolant into the balloon 12. In this embodiment, coolant injection is used. When the balloon 12 inflates, the diameter of the portion of the balloon that contacts the electrode 1 is larger than the diameter of the portion of the electrode 1 that is contacted by the balloon 12. This allows the inflated balloon 12 to push against the electrode 1, thereby pushing the electrode 1 against the bronchial wall 13 and further enhancing the contact effect between the electrode 1 and the bronchial wall 13. The balloon 12 can be cylindrical, spherical, gourd-shaped, or other shapes. The portion supporting the electrode 1 is adapted to the inner shape of the electrode 1. The balloon 12 is preferably made of a conformable material such as TPU.

[0069] like Figure 5 and Figure 6As shown, sensor 3 is mounted on electrode 1. Sensor 3 can be a temperature sensor or a pressure sensor, and there can be one or more sensors 3. The temperature sensor and the pressure sensor can be independently mounted on electrode 1. Sensor 3 can also be an integrated sensor, which has both temperature detection and pressure detection functions. During use, the integrated sensor is sandwiched between electrode 1 and the bronchial inner wall 13, which can monitor the temperature of electrode 1, the temperature of bronchial inner wall 13, and the pressure between electrode 1 and bronchial inner wall 13. This allows for a better assessment of the contact effect between the two.

[0070] like Figure 3 and Figure 4 As shown, the radiofrequency ablation device further includes a delivery tube 4. The electrode 1, balloon 12, and sensor 3 are all connected to external devices via the delivery tube 4. The delivery tube 4, from the outside to the inside, includes an outer tube 40, an inner tube 41, and a balloon catheter 42. Figure 4 From this perspective, the balloon catheter 42 is located at the innermost side and has a gap between it and the inner tube 41.

[0071] In addition to delivering gas, the balloon catheter 42 can also deliver coolant. In this embodiment, the balloon catheter 42 delivers coolant. Specifically, the coolant can be cooling water, cooling brine, or other fluids with low temperatures.

[0072] like Figure 3 and Figure 9 As shown, the balloon catheter 42 extends from the delivery tube 4, enters the balloon 12, and extends from one end of the balloon 12 to the other. In this way, the balloon 12 can provide support for the electrode 1, and the balloon catheter 42 provides support for the balloon 12 to prevent the balloon 12 from sagging and deforming after the coolant enters the balloon 12, thus affecting the support effect on the electrode 1. The distal end of the balloon catheter 42 has a small hole 121 that connects to the balloon 12. After the coolant enters the balloon catheter 42, it enters the balloon 12 through the small hole 121, which can reduce the impact on the balloon 12.

[0073] like Figure 9 and Figure 10 As shown, this is one embodiment of the balloon catheter 42, in which a partition is provided in the middle to divide the balloon catheter 42 into an inlet chamber 42a and an outlet chamber 42b. Coolant enters the balloon 12 from the inlet chamber 42a and flows out of the balloon 12 from the outlet chamber 42b.

[0074] like Figure 11 and Figure 12 As shown, this is a second embodiment of the balloon catheter 42, which is a double-layered tube to form an inlet cavity 42a and an outlet cavity 42b therein. Coolant enters the balloon 12 from the inlet cavity 42a and flows out of the balloon 12 from the outlet cavity 42b.

[0075] Because the balloon catheter 42 has an outlet chamber 42b, after the coolant enters the balloon 12 and circulates, it flows out of the balloon 12 through the outlet chamber 42b. The coolant does not enter the body, thus avoiding stimulation of the nerves in the airway tissues, preventing discomfort, and affecting treatment. Furthermore, there is no need to remove the coolant during surgery, which shortens the operation time.

[0076] like Figure 4 As shown, an electrode lead 44 and a sensor lead 45 are provided between the outer tube 40 and the inner tube 41. This design prevents the thinner electrode lead 44 and sensor lead 45 from being pulled during use, which could lead to poor contact between the electrode lead 44 and electrode 1 and / or poor contact between the sensor lead 45 and sensor 3, affecting the surgical outcome. It also keeps the delivery tube 4 neat and easy to store and organize. One end of the electrode lead 44 is connected to the tail end 16 of electrode 1, and the tail end 16 of electrode 1 enters between the outer tube 40 and the inner tube 41, thus providing better stability for electrode 1.

[0077] like Figure 2 As shown, the radiofrequency ablation device further includes a handle 5 connected to the delivery tube 4. The handle 5 provides a gripping area for the operator, making it convenient for the operator to push and / or rotate the delivery tube 4, electrode 1, and balloon 12 to adjust the ablation position.

[0078] The handle 5 includes a balloon connector 50, an electrical connector 51, and a coolant connector 52.

[0079] The balloon connector 50 is connected to the input cavity 42a of the balloon catheter 42, the electrical connector 51 is connected to the electrode lead 44, the electrical connector 51 is also connected to the sensor lead 45, and the coolant connector 52 is connected to the output cavity 42b of the balloon catheter 42.

[0080] The radiofrequency ablation device further includes a pressure pump 9 and a circulation pump 6. The pressure pump 9 is connected to the balloon connector 50 via a first connecting pipe 60, and the circulation pump 6 is connected to the coolant connector 52 via a second connecting pipe 61.

[0081] like Figure 13 As shown, another embodiment of the balloon is illustrated. Micropores 120 are provided on the surface of the balloon 12, distributed uniformly or unevenly around the balloon 12, or only in the area in contact with the electrode 1. Because the micropores 120 on the surface of the balloon 12 provide a pathway for the coolant to flow out of the balloon 12, an output chamber 42b is no longer provided inside the balloon catheter 42. The coolant flows through the micropores 120 to the electrode 1 and the bronchial inner wall 13 to cool and protect the tissue on the electrode 1 and the bronchial inner wall 13. Since the coolant can cool the bronchial inner wall 13, it can increase the ablation depth and enhance the ablation effect.

[0082] As another implementation, by controlling the total area of ​​the micropores 120 on the balloon 12, it is possible to both discharge coolant to the outside of the balloon 12 through the micropores 120 and allow some coolant to flow out through the output cavity 42b of the balloon conduit 42.

[0083] The radiofrequency ablation device further includes a radiofrequency device 7 and a negative electrode plate 8. The radiofrequency device 7 is connected to the negative electrode plate 8, and at the same time, the radiofrequency device 7 is also electrically connected to an electrical connector 51. Thus, the electrode 1 is connected to the radiofrequency device 7 via the electrode lead 44 and the electrical connector 51, and the sensor 3 is connected to the radiofrequency device 7 via the sensor lead 45 and the electrical connector 51.

[0084] The radiofrequency ablation device further includes a bronchial endoscope (not labeled), which includes a bronchial endoscope 2, an endoscopic visualization device 20, and a suction device 21. The bronchial endoscope 2 provides access to the bronchus for the delivery tube 4. The endoscopic visualization device 20 provides images to guide the delivery tube 4, as well as the electrode 1 and balloon 12 connected to the delivery tube 4, to the treatment site. The suction device 21 aspirates the coolant infused into the bronchus during the procedure.

[0085] The following describes the specific usage process of the radiofrequency ablation device provided in this embodiment:

[0086] In use, a negative electrode plate 8 is installed on the patient's skin and connected to the radio frequency device 7. The bronchoscope 2 is then inserted into the target area in the bronchus through the patient's mouth.

[0087] Electrode 1, balloon 12, and sensor 3, connected to delivery tube 4, are inserted into the target area along the working cavity of bronchoscope 2 via delivery tube 4. During delivery, the endoscopic image is used to determine whether electrode 1 is in place. Simultaneously, during delivery, electrode 1 is constrained by the inner wall of the working cavity and is in a contracted state, as is balloon 12, to facilitate passage through the working cavity. Once electrode 1 reaches the target position and extends out of bronchoscope 2, electrode 1 unfolds into a mesh-like structure, adhering to the inner wall 13 of the bronchus.

[0088] Connect the balloon connector 50 on the handle 5 to the pressure pump 9 through the first pair of connecting pipes 60, connect the electrical connector 51 on the handle 5 to the radio frequency device 7, and connect the coolant connector 52 to the circulation pump 6 through the second pair of connecting pipes 61.

[0089] When the pressure pump 9 is started, coolant is injected into the balloon 12 through the first pair of connecting pipes 60, balloon connector 50, inlet chamber 42a of balloon catheter 42 and small hole 121 at the distal end of balloon catheter 42, so that the balloon 12 is in an inflated state, which further forces the electrode 1 to fit more tightly against the inner wall 13 of the bronchus.

[0090] When the radiofrequency device 7 is activated, a complete radiofrequency circuit is formed between electrode 1, bronchial inner wall 13, human body, negative electrode plate 8, and radiofrequency device 7. The radiofrequency current enters the bronchial inner wall 13 through electrode 1. Due to the rapid change of the electromagnetic field, the positive and negative ions in the inner wall cells move rapidly. The friction between them and between them and other molecules and ions in adjacent cells causes the lesion site to heat up rapidly, causing the water inside and outside the cells to evaporate, dry, shrink, and fall off, thereby achieving the purpose of treatment. The heat is transferred to electrode 1, and electrode 1 also becomes hot.

[0091] When the radio frequency device 7 is started, the circulation pump 6 is started at the same time. After circulating in the balloon 12, the coolant flows into the circulation pump 6 through the output chamber 42b, the coolant connector 52, and the second connecting pipe 61.

[0092] During operation, the sensor 3, located on the electrode 1 and sandwiched between the electrode 1 and the bronchial inner wall 13, can quickly monitor the temperature of the electrode 1 and the tissue on the bronchial inner wall 13 to ensure surgical safety and accurate treatment. At the same time, it can also monitor the pressure between the electrode 1 and the tissue on the bronchial inner wall 13 to determine whether the electrode 1 and the tissue on the bronchial inner wall 13 are in good contact, thereby improving the ablation effect.

[0093] During the procedure, the parameters of the ablation radiofrequency can be adjusted to achieve thermal ablation treatment of lesions of varying degrees on the bronchial wall 13.

[0094] By rotating handle 5, ablation of lesions in different parts of the same segment of the bronchial wall 13 can be achieved.

[0095] By pushing the handle 5, ablation of lesions in different segments of the bronchial wall 13 can be achieved.

[0096] When it is necessary to perform nerve ablation on the left and right bronchi separately, or when using multi-component separate control electrodes, the delivery tube 4 can be marked so that its location can be determined by medical imaging techniques such as X-ray and Doppler ultrasound.

[0097] In the radiofrequency ablation device provided in this embodiment, since the electrode 1 is not attached to the balloon 12 and there is a gap between the balloon catheter 42 and the inner tube 41, the balloon connector 50 can push the balloon 12 to the target position via the balloon catheter 42, then deliver the electrode 1 to the target position, and then retract the balloon 12 from the target position to the target position, allowing it to enter the electrode 1. After the balloon 12 inflates, it can further push the electrode 1 against the bronchial inner wall 13. Since the balloon 12 and the electrode 1 are delivered separately, it is easier for the balloon 12 to pass through the bronchus. That is, for a bronchus of the same size, the size of the balloon 12 that can pass through can be larger, thereby increasing the support force of the balloon 12 on the electrode 1. At the same time, more coolant can be injected into the balloon 12 to improve its cooling effect on the electrode 1.

[0098] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A radiofrequency ablation device, characterized in that, include: The electrode (1) is mesh-like and has a contracted state when it is constrained and an extended state when it is unconstrained. It is connected to an external electrical connector (51) via electrode leads (44). The balloon (12) is located inside the electrode (1), and when inflated, it pushes against the electrode (1). The delivery tube (4) includes an outer tube (40) and an inner tube (41), the electrode lead (44) is located between the outer tube (40) and the inner tube (41), and the delivery tube (4) also includes a balloon catheter (42) connected to one end of the balloon (12), which is located inside the inner tube (41) and has a gap with the inner tube (41); The balloon catheter (42) is provided with an inlet chamber (42a) and an outlet chamber (42b), the inlet chamber (42a) being adapted to introduce coolant into the balloon (12), and the outlet chamber (42b) being adapted to provide a channel for the coolant to flow out of the balloon (12); The free end (17) of the electrode (1) is constricted and has several anti-scratch structures (18). Each anti-scratch structure (18) has a small hole, and a connecting wire passes through each adjacent small hole in sequence to form a limiting ring (19).

2. The radiofrequency ablation device according to claim 1, characterized in that: The electrode (1) is formed by cutting a shape memory alloy.

3. The radiofrequency ablation device according to claim 1, characterized in that: The electrode (1) has an ablation zone (11) located on the raised portion (15) of the electrode (1).

4. The radiofrequency ablation device according to claim 3, characterized in that: The raised portion (15) includes the end (10) of the electrode (1), and the ablation zone (11) is located on the end (10) of the electrode (1).

5. The radiofrequency ablation device according to claim 1, characterized in that: The surface of the balloon (12) is provided with micropores (120).

6. The radiofrequency ablation device according to any one of claims 1-5, characterized in that: The radiofrequency ablation device also includes a sensor (3) arranged on the electrode (1). The sensor (3) is connected to the electrical connector (51) through a sensor lead (45). The sensor lead (45) is located between the outer tube (40) and the inner tube (41).

7. The radiofrequency ablation device according to any one of claims 1-5, characterized in that: Also includes: Negative electrode plate (8); The radio frequency device (7) is electrically connected to the negative electrode plate (8) and connected to the electrical connector (51); The pressure pump (9) is connected to the balloon connector (50) via the first pair of connecting pipes (60); The circulating pump (6) is connected to the coolant connector (52) via the second pair of connecting pipes (61); A bronchial endoscope device includes a bronchial endoscope (2), an endoscopic visualization device (20), and a suction device (21), wherein the bronchial endoscope (2) has a working cavity suitable for passage of the delivery tube (4).

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