Electrical field pulse ablation device and electrical field pulse ablation method

Abstract

The application discloses an electric field pulse ablation device and an electric field pulse ablation method. The electric field pulse ablation device comprises a seat body, at least two ablation needles are arranged on the seat body, the at least two ablation needles are arranged in parallel, each ablation needle is made of a conductive material, and a front end of the ablation needle is an insertion end and a rear end is a lead end. When insertion is performed, the spacing and the angle between the ablation needles can be effectively guaranteed, and the ablation effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to an electric field pulse ablation device and an electric field pulse ablation method. Background Technology

[0002] Ablation therapy is a common treatment method in tumor treatment. It works by causing necrosis of cells within the tumor through temperature, chemicals, and other means.

[0003] Temperature ablation can be divided into cold field ablation or hot field ablation. Its function is to cause tumor cells to dehydrate and form ice crystals, or to cause the tumor to coagulate and die. However, due to the influence of heat conduction, all of the above ablation methods can easily affect surrounding tissues and cause damage to surrounding normal tissues, especially when there are blood vessels or nerves nearby, which greatly increases the risk of surgery.

[0004] Based on this, an electric field pulse ablation method has now emerged. This ablation method forms a high-voltage electric field pulse in the area to be ablated, which pierces the cell membrane and causes tumor cell necrosis. This ablation method can avoid the defects of all temperature ablation, so its effect is very obvious.

[0005] However, existing electric field pulse ablation devices have the following drawbacks:

[0006] 1. Existing electric field pulse ablation devices mostly use monopolar ablation needles. During ablation, it is necessary to insert the electric field pulse ablation devices of each monopolar needle into the area to be ablated in steps, and then energize the electric field pulse ablation devices to form an ablation electric field area between the two (monopolar) electric field pulse ablation devices, and then ablate the tissue to be ablated. During the operation, it is necessary to insert two ablation needles into the human tissue separately. The distance and angle between the two ablation needles will be deviated, making it impossible to achieve precise control and affecting the ablation effect.

[0007] 2. During ablation, a large incision needs to be made in the human body to insert two ablation needles into the area to be ablated. This makes minimally invasive surgery impossible, and the incision will cause significant damage to the human body, which is not conducive to the patient's postoperative recovery. Summary of the Invention

[0008] The purpose of this invention is to provide an electric field pulse ablation device and an electric field pulse ablation method. This invention can precisely control the distance and angle between two ablation needles, precisely control the ablation effect, and reduce the harm of the wound to the patient.

[0009] The present invention provides an electric field pulse ablation device, including a base, on which at least two ablation needles are provided. The at least two ablation needles are arranged in parallel. Each ablation needle is made of conductive material, and the front end of the ablation needle is an insertion end and the rear end is a conductive end.

[0010] In one embodiment, the base is provided with a mounting hole; at least one of the ablation needles is movably disposed in the mounting hole and connected to the rotating mechanism at the rear end.

[0011] In one embodiment, the tip of the ablation needle is offset laterally relative to its rear end.

[0012] In one embodiment, the ablation needle includes a first straight segment, a second straight segment, and an offset transition segment. The first straight segment and the second straight segment are along the longitudinal direction of the ablation needle. The offset transition segment is located between the first straight segment and the second straight segment, and the front end of the offset transition segment is offset to the side relative to its rear end.

[0013] In one embodiment, at least two of the ablation needles are movably disposed in the mounting hole at the front end position and connected to the rotating mechanism at the rear end position, with the positions of the first straight section, the second straight section and the offset transition section of each ablation needle corresponding to each other.

[0014] In one embodiment, an ablation needle is also provided between each of the ablation needles on the side. The ablation needle is straight and located at the radial center of the seat.

[0015] In one embodiment, at least two of the ablation needles are movably disposed in the mounting hole at the front end and connected to the rotating mechanism at the rear end.

[0016] In one embodiment, a first gear and at least two second gears are provided on the seat, and the rear end positions of at least two of the ablation needles are fixedly connected to the second gears, and the first gear meshes with at least two of the second gears.

[0017] In one embodiment, an adjustment knob is also provided on the base, which engages with the first gear.

[0018] In one embodiment, the seat body is hollow to form an inner cavity, and the first gear and two second gears are installed inside the inner cavity. An adjustment hole is provided on the rear side of the seat body, and an adjustment pin is provided at the adjustment hole. The first gear is connected to the adjustment knob through the adjustment pin.

[0019] In one embodiment, the seat body includes a rear seat and a front seat, the rear seat being connected to the front seat, and the inner cavity being disposed between the rear seat and the front seat.

[0020] In one embodiment, the seat includes a main seat and an external conduit located in front of the main seat, the external conduit being sleeved over the plurality of ablation needles.

[0021] In one embodiment, a longitudinal adjustment device is provided between the main seat and the outer conduit.

[0022] In one embodiment, an adjusting sleeve is provided between the main seat and the outer guide tube, and an adjusting nut is provided on the outer guide tube. A matching adjusting thread is provided between the adjusting sleeve and the adjusting nut. The longitudinal adjusting device includes an adjusting sleeve and an adjusting nut.

[0023] In one embodiment, the adjusting thread includes an internal thread and an external thread, with the internal thread disposed on the adjusting sleeve and the external thread disposed on the external guide tube.

[0024] In one embodiment, an outer insulating layer is provided outside each of the ablation needles, the outer insulating layer covering each of the ablation needles.

[0025] In one embodiment, the ablation needle body is made of a conductive material and a conductive layer is formed on the outer surface of the needle body. An insulating film layer is provided on the outer surface of the needle body, which divides the conductive layer into at least two conductive segments.

[0026] In one embodiment, the ablation needle is hollow to form a temperature-regulating channel.

[0027] In one embodiment, the ablation needle is hollow to form a channel, and a temperature sensing element is disposed within the channel.

[0028] The present invention also provides an electric field pulse ablation method, which includes the following steps:

[0029] At the same time, at least two parallel ablation needles are advanced into the area to be ablated;

[0030] The ablation needle body is energized;

[0031] An ablation electric field region is formed between at least two of the ablation needles, and the tissue to be ablated is ablated through this electric field ablation region.

[0032] The present invention also provides another electric field pulse ablation method, which includes the following steps:

[0033] Advance at least two parallel ablation needles into the area to be ablated;

[0034] The distance between at least two ablation needles is adjusted by rotating at least one of the ablation needles.

[0035] The ablation needle body is energized;

[0036] An ablation electric field region is formed between at least two of the ablation needles, and the tissue to be ablated is ablated through this electric field ablation region.

[0037] The present invention also provides another electric field pulse ablation method, which includes the following steps:

[0038] Advance at least two parallel ablation needles into the area to be ablated;

[0039] Adjust the longitudinal position of the external catheter in front of the main seat relative to at least two of the ablation needles, thereby adjusting the length of the exposed tip of at least two of the ablation needles relative to the external catheter;

[0040] The ablation needle body is energized;

[0041] An ablation electric field region is formed between at least two of the ablation needles, and the tissue to be ablated is ablated through this electric field ablation region.

[0042] The technical solution provided by this invention has the following advantages and effects:

[0043] 1. The electric field pulse ablation device includes at least two ablation needles, which are mounted on a base. During insertion, at least two ablation needles can be inserted into the area to be ablated at one time through the base. Since at least two ablation needles are arranged in parallel on the base, the spacing and angle between each ablation needle can be effectively guaranteed during insertion, thereby improving the ablation effect.

[0044] 2. At least two ablation needles are installed on the base. During the ablation procedure, at least two ablation needles can be easily inserted into the area to be ablated without having to make a large incision in the human body. This allows for a better minimally invasive procedure and is beneficial for the patient's postoperative recovery.

[0045] 3. The distance between at least two ablation needles of the electric field pulse ablation device can be easily adjusted. The operation can be performed through the rear end of the electric field pulse ablation device without removing the device from the human body, thus reducing further harm to the patient. Furthermore, the distance adjustment between at least two ablation needles is also more convenient.

[0046] 4. The ablation needle of the electric field pulse ablation device is provided with an insulating film layer. The insulating film layer divides the conductive layer into at least two conductive segments, which can avoid the generation of overcurrent and thermal effects when the ablation area is large.

[0047] 5. The seat includes a main seat and an outer catheter located in front of the main seat. The outer catheter is sleeved outside the multiple ablation needles. When the ablation needles are inserted, the ablation needles can avoid damaging the surrounding tissues, thus improving safety.

[0048] 6. The ablation needle is hollow inside to form a temperature regulating channel. The ablation needle (and surrounding tissue) can be cooled by a cooling medium (such as a gaseous cooling medium), or heated by other media. A temperature control element (such as a heating wire) can also be set in the temperature regulating channel to heat the ablation needle (and surrounding tissue). Attached Figure Description

[0049] The accompanying drawings illustrate specific examples of the technical solutions described in this invention and, together with the detailed embodiments, form part of the specification, serving to explain the technical solutions, principles, and effects of this invention.

[0050] Unless otherwise specified or defined, the same reference numerals in different figures represent the same or similar technical features, and different reference numerals may be used to represent the same or similar technical features.

[0051] Figure 1 This is a structural diagram of the electric field pulse ablation device in Embodiment 1 of the present invention;

[0052] Figure 2 This is a cross-sectional view of the electric field pulse ablation device in Embodiment 1 of the present invention;

[0053] Figure 3 This is an exploded view of the electric field pulse ablation device in the closed state in Embodiment 1 of the present invention;

[0054] Figure 4 This is an exploded view of the electric field pulse ablation device in the open state in Embodiment 1 of the present invention;

[0055] Figure 5 This is a cross-sectional view of the rear seat in Embodiment 1 of the present invention;

[0056] Figure 6 This is a top view of the rear seat in Embodiment 1 of the present invention;

[0057] Figure 7 This is a cross-sectional view of the front seat in Embodiment 1 of the present invention;

[0058] Figure 8 This is a top view of the front seat in Embodiment 1 of the present invention;

[0059] Figure 9 This is a structural diagram of the adjustment knob in Embodiment 1 of the present invention;

[0060] Figure 10 This is a cross-sectional view of the adjustment knob in Embodiment 1 of the present invention;

[0061] Figure 11 This is a structural diagram of the adjusting pin in Embodiment 1 of the present invention;

[0062] Figure 12 This is a structural diagram of the electric field pulse ablation device in Embodiment 2 of the present invention;

[0063] Figure 13 This is an exploded view of the electric field pulse ablation device in Embodiment 2 of the present invention;

[0064] Figure 14 This is a cross-sectional view of the electric field pulse ablation device in the retracted state in Embodiment 2 of the present invention;

[0065] Figure 15 This is a cross-sectional view of the electric field pulse ablation device in the extended and open state in Embodiment 2 of the present invention;

[0066] Figure 16 This is a cross-sectional view of the electric field pulse ablation device in the extended and closed state in Embodiment 2 of the present invention;

[0067] Figure 17 This is a cross-sectional view of the adjusting sleeve in Embodiment 2 of the present invention;

[0068] Figure 18 This is a cross-sectional view of the lower nut in Embodiment 2 of the present invention;

[0069] Figure 19 This is a cross-sectional view of the front seat in Embodiment 2 of the present invention;

[0070] Figure 20 This is a partial cross-sectional view of the electric field pulse ablation device in Embodiment 3 of the present invention;

[0071] Figure 21 yes Figure 20 A magnified view of a portion of the image;

[0072] Figure 22 This is a structural diagram of the electric field pulse ablation device in Embodiment 4 of the present invention;

[0073] Figure 23 yes Figure 22 Enlarged cross-sectional view;

[0074] Figure 24 This is a structural diagram of the electric field pulse ablation device in Embodiment 5 of the present invention;

[0075] Figure 25 This is an exploded view of the electric field pulse ablation device in Embodiment 5 of the present invention;

[0076] Figure 26 This is a partial enlarged view of the electric field pulse ablation device in the closed state in Embodiment 5 of the present invention;

[0077] Figure 27This is a partial enlarged view of the electric field pulse ablation device in the open state in Embodiment 5 of the present invention;

[0078] Figure 28 This is a structural diagram of the electric field pulse ablation device in Embodiment Six of the present invention;

[0079] Figure 29 This is a structural diagram of the electric field pulse ablation device in Embodiment 7 of the present invention;

[0080] Figure 30 yes Figure 29 A magnified partial sectional view;

[0081] Figure 31 This is a structural diagram of the electric field pulse ablation device in Embodiment 8 of the present invention;

[0082] Figure 32 This is a partial enlarged view of the electric field pulse ablation device in the closed state in Embodiment 8 of the present invention;

[0083] Figure 33 This is a partially enlarged view of the electric field pulse ablation device in the open state in Embodiment 8 of the present invention;

[0084] Explanation of reference numerals in the attached figures:

[0085] 10. Seat body; 11. Main seat; 111. Rear seat; 1111. Window; 1112. Arc-shaped guide groove.

[0086] 112. Front seat; 113. Positioning hole; 114. Top spring; 13. Outer guide tube; 131. Guide block; 132. Adjusting nut; 14. Inner cavity; 15. Adjusting sleeve; 151. Internal thread; 152. External thread; 153. Lower nut; 1531. Center hole; 154. Pin hole; 16. Mounting hole; 17. Connecting thread.

[0087] 20. Rotating mechanism; 201. First gear; 202. Second gear; 23. Adjusting knob; 231. Embossed pattern; 232. Limiting rod; 24. Adjusting pin; 241. Adjusting hole; 242. Fixing nut; 243. Fixing thread; 244. Limiting end; 245. Cylindrical section; 246. Rotating mating section.

[0088] 40. Ablation needle; 41. First straight segment; 42. Second straight segment; 43. Offset transition segment; 44. Insulating film layer; 441. Conductive segment; 45. Temperature regulating channel; 451. Heating wire; 452. Inner insulating tube; 453. Outer insulating layer. Detailed Implementation

[0089] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0090] Unless otherwise specified or defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In practical contexts relating to the technical solutions of this invention, all technical and scientific terms used herein may also have meanings corresponding to the objectives of achieving the technical solutions of this invention.

[0091] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0092] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0093] It should be noted that when a component is considered "fixed" to another component, it can be directly fixed to the other component or there can be an intervening component; when a component is considered "connected" to another component, it can be directly connected to the other component or there can be an intervening component; when a component is considered "mounted" on another component, it can be directly mounted on the other component or there can be an intervening component; when a component is considered "placed" on another component, it can be directly placed on the other component or there can be an intervening component.

[0094] Unless otherwise specified or defined, the terms “described” or “the” as used herein refer to the technical features or technical content mentioned or described above, which may be the same as or similar to the technical features or technical content mentioned above.

[0095] Undoubtedly, any technical content or feature that is contrary to or clearly contradicts the purpose of this invention should be excluded.

[0096] Example 1

[0097] like Figures 1 to 11 As shown, the electric field pulse ablation device includes a base 10, on which two ablation needles 40 are provided. The two ablation needles 40 are arranged in parallel. Each ablation needle 40 is made of conductive material, and the front end of the ablation needle 40 is an insertion end with a pointed tip. The rear end of the ablation needle 40 is a conductive end.

[0098] The seat 10 includes a main seat 11 and an outer conduit 13 located in front of the main seat 11. The outer conduit 13 is sleeved on the ablation needle 40. The main seat 11 includes a rear seat 111 and a front seat 112. The rear seat 111 and the front seat 112 are connected by a connecting thread 17, forming an inner cavity 14 between them. The front seat 112 has two mounting holes 16. A guide block 131 is provided inside the outer conduit 13, and the guide block 131 also has two mounting holes 16. The two ablation needles 40 are movably inserted through the mounting holes 16 and connected to the rotating mechanism 20 at their rear ends. An outer insulating layer 453 is provided outside each of the two ablation needles 40, and the two outer insulating layers 453 respectively wrap around the ablation needles 40, with the front ends of the ablation needles 40 exposed.

[0099] The rotating mechanism 20 includes a first gear 201, a second gear 202, an adjusting knob 23, and an adjusting pin 24. The adjusting knob 23 is provided with two adjusting rods 232, and two arc-shaped guide grooves 1112 are provided on the rear seat 111. When the adjusting knob 23 rotates, its circumferential direction is limited by the two arc-shaped guide grooves 1112, so that the adjusting knob 23 can only rotate within a certain angle. The first gear 201, the second gear 202, and the adjusting pin 24 are located inside the inner cavity 14. The outer side of the adjusting knob 23 is provided with concave and convex textures 231. There are two second gears 202. The rotating shafts of the first gear 201 and the second gear 202 are inserted into the positioning hole 113 and can rotate relative to the positioning hole 113. The rear end positions of the two ablation needles 40 are fixedly connected to the second gears 202. The first gear 201 is located between the two second gears 202 and meshes with the two second gears 202. The adjusting pin 24 has a hexagonal structure with a fixed thread 243 at its rear end and a limiting end 244 at its lower end. The middle section has a cylindrical section 245 and a rotating engagement section 246. The limiting end 244 is inserted into the front seat 112 and is circumferentially connected to the adjusting pin 24 via the first gear 201. An adjusting hole 241 is provided on the rear side of the rear seat 111. The outer end of the adjusting pin 24 passes through the adjusting hole 241 and is circumferentially connected to the adjusting knob 23 via a fixing nut 242. The cylindrical section 245 engages with the adjusting hole 241, and the rotating engagement section 246 is a hexagonal nut that engages with the adjusting knob 23. When the adjusting knob 23 is rotated, the first gear 201 is driven to rotate via the adjusting pin 24.

[0100] The two ablation needles 40 are movably disposed within the mounting hole 16 at their front ends and connected to the rotating mechanism 20 at their rear ends. Adjusting the knob 23 and adjusting the pin 24 rotates the first gear 201, which in turn rotates the two second gears 202, thus rotating the two ablation needles 40. A window 1111 is provided on the side of the rear seat 111 for threading the wires connected to the ablation needles 40 without affecting the operation of the adjusting knob 23. A tip spring 114 is provided at the rear end of the ablation needle, which connects the wires to the ablation needle 40.

[0101] The front ends of the two ablation needles 40 are offset laterally relative to their rear ends. Specifically, each ablation needle 40 includes a first straight segment 41, a second straight segment 42, and an offset transition segment 43. The first straight segment 41 and the second straight segment 42 are along the longitudinal direction of the ablation needle 40. The offset transition segment 43 is located between the first straight segment 41 and the second straight segment 42, and the front end of the offset transition segment 43 is offset laterally relative to its rear end. The positions of the first straight segment 41, the second straight segment 42, and the offset transition segment 43 of each ablation needle 40 correspond. Correspondingly, the outer insulating layer 453 also includes a first straight segment 41, a second straight segment 42, and an offset transition segment 43.

[0102] When the two ablation needles 40 are rotated by adjusting knob 23, the distance between the second straight segments 42 at the front ends of the two ablation needles 40 changes, thereby controlling the opening and closing of the two ablation needles 40. Please compare. Figure 3 and Figure 4 This structure can reduce the size of the electric field pulse ablation device when inserted into the human body, which is very beneficial for the minimally invasive effect of ablation surgery. After insertion into the human body, the ablation distance between the two ablation needles 40 can be controlled by the operation of the rear end, thereby controlling the ablation area and the ablation electric field. Based on the aforementioned structure, the electric field pulse ablation device described in this embodiment can adopt the following two electric field pulse ablation methods:

[0103] An electric field pulse ablation method, comprising the following steps:

[0104] Simultaneously, two parallel ablation needles 40 are advanced into the area to be ablated;

[0105] The needle body of the ablation needle 40 is energized;

[0106] An ablation electric field region is formed between the two ablation needles 40, and the tissue to be ablated is ablated through this electric field ablation region.

[0107] An electric field pulse ablation method, comprising the following steps:

[0108] Advance two parallel ablation needles 40 to the area to be ablated;

[0109] The distance between the two ablation needles 40 can be adjusted by rotating them.

[0110] The needle body of the ablation needle 40 is energized;

[0111] An ablation electric field region is formed between the two ablation needles 40, and the tissue to be ablated is ablated through this electric field ablation region.

[0112] The advantages of the electric field pulse ablation device described in this embodiment are as follows:

[0113] 1. The electric field pulse ablation device includes two ablation needles 40, which are mounted on the base 10. During insertion, the two ablation needles 40 can be inserted into the area to be ablated at one time through the base 10. Since the two ablation needles 40 are arranged in parallel on the base 10, the spacing and angle between each ablation needle 40 can be effectively guaranteed during insertion, thereby improving the ablation effect.

[0114] 2. Install two ablation needles 40 on the base 10. During the ablation procedure, the two ablation needles 40 can be easily inserted into the area to be ablated without having to make a large incision in the human body. This can achieve minimally invasive surgery and is beneficial to the patient's postoperative recovery.

[0115] 3. The distance between the two ablation needles 40 of the electric field pulse ablation device can be easily adjusted. The operation can be performed through the rear end of the electric field pulse ablation device without removing the electric field pulse ablation device from the human body, reducing further harm to the patient. Furthermore, the distance between the two ablation needles 40 is easier to adjust.

[0116] 4. The seat 10 includes a main seat 11 and an outer conduit 13 located in front of the main seat 11. The outer conduit 13 is sleeved on the ablation needle 40. When the ablation needle 40 is inserted, it can prevent the ablation needle 40 from damaging the surrounding tissue, thus improving safety.

[0117] It is understood that in this embodiment, the number of ablation needles 40 is not limited to two.

[0118] Example 2

[0119] like Figures 12 to 19As shown, in this embodiment, the seat 10 further includes an adjusting sleeve 15 at the front end and a lower nut 153. The rear end of the adjusting sleeve 15 is provided with a pin hole 154. A retaining ring 1121 is provided on the front seat 112. After the fixing pin passes through the pin hole 154 and the retaining ring 1121, the front seat 112 is connected to the adjusting sleeve 15. The lower nut 153 is located at the front end of the adjusting sleeve 15. An adjusting nut 132 is provided at the rear end of the outer guide tube 13. An internal thread 151 is provided on the inner wall of the adjusting sleeve 15, and an external thread 152 is provided on the outer wall of the adjusting nut 132. The outer guide tube 13 passes through the middle hole 1531 of the lower nut 153. The adjusting nut 132 at its rear end and the adjusting sleeve 15 are engaged by the internal thread 151 and the external thread 152, so that the outer guide tube 13 can rotate relative to the adjusting sleeve 15, thereby adjusting the exposed length of the outer guide tube 13, and thus adjusting the length of the ablation needle 40 exposed in the outer guide tube 13. The electric field pulse ablation device described in this embodiment can employ the following electric field pulse ablation method:

[0120] An electric field pulse ablation method, comprising the following steps:

[0121] After puncture and cannulation via the laparoscope;

[0122] Advance two parallel ablation needles 40 to the area to be ablated;

[0123] Adjust the longitudinal position of the external conduit 13 in front of the main seat 11 relative to the two ablation needles 40, thereby adjusting the length of the front ends of the two ablation needles 40 exposed relative to the external conduit 13;

[0124] Insert the ablation probe, with the needle spacing adjusted, into the tissue to be ablated;

[0125] The needle body of the ablation needle 40 is ablated by applying an electric current;

[0126] An ablation electric field region is formed between the two ablation needles 40, and the tissue to be ablated is ablated through this electric field ablation region.

[0127] The electric field pulse ablation device described in this embodiment can be connected to the puncture cannula of a laparoscope and is conveniently used in laparoscopic surgery.

[0128] Example 3

[0129] like Figure 20 , Figure 21 As shown, in this embodiment, the ablation needle 40 is made of a conductive material and a conductive layer is formed on the outer surface of the needle body. An insulating film layer 44 is provided on the outer surface of the needle body, which divides the conductive layer into at least two conductive segments. The electric field pulse ablation device described in this embodiment can employ the following electric field pulse ablation method:

[0130] An electric field pulse ablation method, comprising the following steps:

[0131] Insert the ablation needle 40 into the tissue to be ablated;

[0132] The needle body of the ablation needle 40 is energized;

[0133] The needle body forms at least two ablation electric field regions within the tissue to be ablated through its at least two conductive segments, and performs ablation treatment on the tissue to be ablated through the at least two electric field ablation regions.

[0134] The ablation needle 40 of the electric field pulse ablation device is provided with an insulating film layer 44. The insulating film layer 44 divides the conductive layer into at least two conductive segments, which can avoid the generation of overcurrent and thermal effects when the ablation area is large.

[0135] Example 4

[0136] like Figure 22 , Figure 23 As shown, in this embodiment, the ablation needle 40 is hollow to form a temperature-regulating channel 45. The ablation needle 40 (and surrounding tissue) can be cooled by a cooling medium (such as a gaseous cooling medium), or heated by other media. Alternatively, a temperature control element (such as a heating wire 451) can be installed within the temperature-regulating channel 45 to heat the ablation needle 40 (and surrounding tissue). In this embodiment, an inner insulating tube 452 is provided within the temperature-regulating channel 45, and a heating wire 451 is installed within the inner insulating tube 452 to facilitate heating and ablation operations. A temperature sensing element can also be installed within the channel to sense the temperature of the ablation needle 40 (and surrounding tissue). Alternatively, an air-cooling tube can be installed within the temperature-regulating channel 45 for air-cooled ablation.

[0137] Example 5

[0138] like Figures 24 to 27 As shown, in this embodiment, there are three ablation needles 40, which are evenly distributed circumferentially on the seat 10. The main difference between this embodiment and embodiment two is the number of ablation needles 40. It can be understood that, as needed, the number of ablation needles 40 can also be set to four or more. The principle is the same as that of embodiment one, and will not be repeated here.

[0139] Example 6

[0140] like Figure 28 As shown, compared with Embodiment 5, this embodiment has an insulating film layer 44 on the outer surface of the needle body, which divides the conductive layer into at least two conductive segments. The difference is the same as in Embodiment 3 above, and will not be repeated here.

[0141] Example 7

[0142] like Figure 29 , Figure 30 As shown, compared with Embodiment 5, this embodiment includes an inner insulating tube 452 within the temperature control channel 45, and a heating wire 451 within the inner insulating tube 452 for heating ablation and other operations. A temperature sensing element can also be provided within this channel to sense the temperature of the ablation needle 40 (and surrounding tissue). Alternatively, an air-cooling tube can be provided within the temperature control channel 45 for air-cooled ablation. The differences are described in Embodiment 4 above and will not be repeated here.

[0143] Example 8

[0144] like Figures 31 to 33 As shown, in this embodiment, an additional ablation needle 40 is provided between each of the ablation needles 40 on the side. This ablation needle 40 is straight and located at the radial center of the base 10. That is, the ablation needle 40 located at the center is straight, while the three ablation needles 40 located on the outer periphery are bent. When adjusted by the adjustment knob 23, the three ablation needles 40 on the outer periphery will open or close, while the ablation needle 40 in the middle will not rotate or move.

[0145] The purpose of the above embodiments is to reproduce and derive the technical solution of the present invention by way of example, and to fully describe the technical solution, purpose and effect of the present invention. The purpose is to enable the public to have a more thorough and comprehensive understanding of the disclosure of the present invention, and not to limit the scope of protection of the present invention.

[0146] The above embodiments are not an exhaustive list based on the present invention, and there may be many other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. An electric field pulse ablation device, characterized in that, Includes a base, on which at least two ablation needles are provided, the at least two ablation needles are arranged in parallel, each ablation needle is made of conductive material, and the front end of the ablation needle is an insertion end and the rear end is a conductive end; The base is provided with a mounting hole; at least one of the ablation needles is movably disposed in the mounting hole and connected to the rotating mechanism at the rear end position; The tip of the ablation needle is offset to the side relative to its rear end; The ablation needle includes a first straight segment, a second straight segment, and an offset transition segment. The first straight segment and the second straight segment are along the longitudinal direction of the ablation needle. The offset transition segment is located between the first straight segment and the second straight segment, and the front end of the offset transition segment is offset to the side relative to its rear end. At least two of the ablation needles are movably disposed in the mounting hole at the front end position and connected to the rotating mechanism at the rear end position. The positions of the first straight section, the second straight section and the offset transition section of each ablation needle are corresponding.

2. The electric field pulse ablation device as described in claim 1, characterized in that, An ablation needle is also provided between each of the ablation needles on the side. The ablation needle is straight and located at the radial center of the seat.

3. The electric field pulse ablation device as described in any one of claims 1 to 2, characterized in that, At least two of the ablation needles are movably disposed in the mounting hole at the front end and connected to the rotating mechanism at the rear end.

4. The electric field pulse ablation device as described in claim 3, characterized in that, The seat is provided with a first gear and at least two second gears, and the rear end positions of at least two of the ablation needles are fixedly connected to the second gears, and the first gear meshes with at least two of the second gears.

5. The electric field pulse ablation device as described in claim 4, characterized in that, An adjustment knob is also provided on the base, which engages with the first gear.

6. The electric field pulse ablation device as described in claim 5, characterized in that, The seat body is hollow to form an inner cavity, and the first gear and two second gears are installed inside the inner cavity. An adjustment hole is provided on the rear side of the seat body, and an adjustment pin is provided at the adjustment hole. The first gear is connected to the adjustment knob through the adjustment pin.

7. The electric field pulse ablation device as described in claim 6, characterized in that, The seat body includes a rear seat and a front seat, the rear seat is connected to the front seat, and the inner cavity is located between the rear seat and the front seat.

8. The electric field pulse ablation device according to any one of claims 1 to 2, characterized in that, The seat includes a main seat and an external catheter located in front of the main seat, the external catheter being sleeved over the plurality of ablation needles.

9. The electric field pulse ablation device as described in claim 8, characterized in that, A longitudinal adjustment device is provided between the main seat and the outer conduit.

10. The electric field pulse ablation device as described in claim 9, characterized in that, An adjusting sleeve is provided between the main seat and the outer guide tube, and an adjusting nut is provided on the outer guide tube. A matching adjusting thread is provided between the adjusting sleeve and the adjusting nut. The longitudinal adjusting device includes an adjusting sleeve and an adjusting nut.

11. The electric field pulse ablation device as described in claim 10, characterized in that, The adjusting thread includes an internal thread and an external thread. The internal thread is provided on the adjusting sleeve, and the external thread is provided on the external guide tube.

12. The electric field pulse ablation device according to any one of claims 1 to 2, characterized in that, An outer insulating layer is provided outside each of the ablation needles, which encloses each of the ablation needles.

13. The electric field pulse ablation device according to any one of claims 1 to 2, characterized in that, The ablation needle body is made of conductive material and a conductive layer is formed on the outer surface of the needle body. An insulating film layer is provided on the outer surface of the needle body, which divides the conductive layer into at least two conductive segments.

14. The electric field pulse ablation device according to any one of claims 1 to 2, characterized in that, The ablation needle is hollow inside, forming a temperature-regulating channel.

15. The electric field pulse ablation device according to any one of claims 1 to 2, characterized in that, The ablation needle is hollow inside to form a channel, and a temperature sensing element is installed in the channel.

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