Ablation catheter and ablation system

Abstract

The utility model discloses an ablation catheter and an ablation system, and the ablation catheter comprises a catheter body which comprises a head end and a bending section connected with the head end; the ultrasonic transducer is arranged in the head end in the radial direction of the catheter body, so that the ultrasonic transducer can obtain an ultrasonic sector diagram in the forward direction of the head end; the ablation head electrode is arranged on the outer surface of the head end and used for conducting ablation on the target position, and the part, corresponding to the ultrasonic sector diagram, of the ablation head electrode is configured to enable ultrasonic waves to pass through; and the positioning electrode is arranged on the peripheral surface of the bent section and is used for positioning the target position. The ultrasonic transducer is integrated in the ablation catheter, so that the ultrasonic transducer can obtain the ultrasonic sector diagram with the forward head end, and when the ablation catheter is placed in a human body, ablation can be guided in a close range, ablation complications can be monitored, the ablation depth can be observed, and the ablation effect can be judged under the guidance of the ultrasonic sector diagram. And a doctor can be guided to select proper ablation energy, ablation time, ablation power and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more specifically, to an ablation catheter. In addition, the utility model also relates to an ablation system comprising the ablation catheter. Background Art

[0002] At present, electrophysiological therapy is often used clinically to treat arrhythmia-related diseases. Electrophysiological therapy mainly involves delivering the ablation catheter to the lesion under the guidance of positioning navigation, and then allowing the ablation catheter to release energy to the adjacent heart tissue, inducing partial myocardial degeneration and necrosis, thereby blocking the conduction of abnormal ECG signals and restoring the heart rate to normal. In this process, guiding the precise positioning of the ablation catheter so that the electrode at the tip of the ablation catheter is in good contact with the myocardial tissue is the key to ensuring the effect of permanent transmural ablation.

[0003] In the prior art, three methods are mainly used to guide the ablation catheter into position: X-ray fluoroscopy, electroanatomical mapping, and intracardiac ultrasound. However, since the cardiac anatomical structure of each patient is different, X-ray fluoroscopy and electroanatomical mapping alone cannot provide a completely clear picture of the internal anatomical structure of the heart. Although intracardiac ultrasound can display the fine anatomical structure inside the heart, it requires the use of another intracardiac ultrasound catheter placed aside for real-time monitoring. That is, the ablation catheter and the intracardiac ultrasound catheter need to be used at the same time, which requires at least two venous accesses, increasing the complexity of the operation and damage to the vascular access.

[0004] Therefore, how to provide an ablation catheter so as to observe the ablation site in real time is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present invention is to provide an ablation catheter which can observe the ablation site in real time.

[0006] Another object of the present invention is to provide an ablation system including the above-mentioned ablation catheter, which can guide ablation according to the real-time ultrasound image of the ablation site.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An ablation catheter, comprising:

[0009] A catheter body, comprising a head end and a curved section connected to the head end;

[0010] An ultrasonic transducer is disposed in the head end along the radial direction of the catheter body so that the ultrasonic transducer can obtain an ultrasonic fan image in the forward direction of the head end;

[0011] an ablation head electrode, disposed on the outer surface of the head end, for ablating the target position, wherein the portion of the ablation head electrode corresponding to the ultrasound fan diagram is configured to allow ultrasound to pass through;

[0012] A positioning electrode is arranged on the outer peripheral surface of the curved section and is used to locate the target position.

[0013] Optionally, the number of the positioning electrodes is N, N is an odd number, and the ablation head electrode and the N positioning electrodes are configured as (N+1) / 2 mapping electrode pairs for locating the target position.

[0014] Optionally, the positioning electrode is a ring electrode, and N ring electrodes are arranged at intervals along the axial direction of the curved segment.

[0015] Optionally, the ablation head electrode is provided with a perfusion hole, and the catheter body is provided with a perfusion passage connected with the perfusion hole, and the perfusion passage is used for introducing a functional agent when the ablation head electrode is ablating.

[0016] Optionally, a temperature sensor is provided in the head end for providing real-time feedback of the temperature of the head end during the ablation process.

[0017] Optionally, one end of the catheter body away from the head end is connected to an operating handle, the operating handle is provided with a deflection knob, a pull wire is connected between the deflection knob and the bending section, and when the deflection knob rotates, the pull wire drives the bending section to adjust the curvature to deflect the head end.

[0018] Optionally, the operating handle is provided with:

[0019] An ultrasonic signal transmission connector, wherein the ultrasonic transducer is connected to the ultrasonic signal transmission connector via an ultrasonic signal transmission cable inserted into the catheter body;

[0020] The ablation energy transmission connector is connected to the ablation head electrode and the positioning electrode through energy transmission wires passing through the catheter body.

[0021] Optionally, the portion of the ablation head electrode corresponding to the ultrasonic fan image includes a plurality of metal layers, and the thickness of each of the metal layers is less than 1 μm.

[0022] Optionally, a side of the ultrasonic transducer facing away from the front of the head end or a side of the ultrasonic transducer facing the circumference of the head end is connected to a flexible circuit board.

[0023] An ablation system comprises the ablation catheter mentioned above.

[0024] Optionally, the ablation catheter comprises an ultrasound signal transmission connector and an ablation energy transmission connector, the ultrasound signal transmission connector is connected to the ultrasound transducer of the ablation catheter, and the ablation energy transmission connector is respectively connected to the ablation head electrode and the positioning electrode of the ablation catheter;

[0025] The ablation system includes an ablation instrument and an ultrasonic control device. The ablation instrument is connected to the ablation energy transmission connector, and the ultrasonic control device is connected to the ultrasonic signal transmission connector.

[0026] The ablation catheter provided by the utility model integrates an ultrasonic transducer into the ablation catheter, and arranges the ultrasonic transducer along the radial direction of the catheter body, so that the ultrasonic transducer can obtain an ultrasonic fan image in the front direction of the head end. In this way, when the ablation catheter is placed in the human body, the tissue structure in the target position in the front direction of the head end can be identified under the guidance of the ultrasonic fan image, and the distance between the ultrasonic image of the ablation head electrode and the target position (i.e., the position to be ablated, such as the local lesion point tissue in the human heart) in the ultrasonic fan image can be observed to adjust the degree of contact between the ablation head electrode and the target position, ensuring that the ablation head electrode and the target position remain in stable contact throughout the ablation process, thereby ensuring the safety and effectiveness of ablation. In addition, during the ablation process, the thickness of the target position can be detected through the ultrasonic fan image to avoid perforation; and the acoustic difference before and after ablation of the target position tissue can be detected through the ultrasonic fan image, and the ablation depth can be fed back accordingly.

[0027] It can be seen that the ablation catheter, by combining forward ultrasound imaging with the ablation catheter, can guide ablation at close range and monitor ablation complications, and is particularly suitable for the treatment of special bypass pathways, free walls, and idiopathic ventricular arrhythmias. Moreover, it can directly observe the ablation depth of the lesion point and judge the ablation effect, which is helpful in guiding doctors to choose appropriate ablation energy, ablation time, ablation power, etc.

[0028] The ablation system provided by the utility model includes the above-mentioned ablation catheter and has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of an ablation catheter provided by a specific embodiment of the utility model;

[0031] Figure 2A schematic diagram of an ultrasonic fan diagram in the front direction of the head end obtained by the ultrasonic transducer;

[0032] Figure 3 Schematic diagram of the internal structure of the ablation catheter.

[0033] Figures 1 to 3 The reference numerals in the figures are as follows:

[0034] 1 is the catheter body, 11 is the head end, 12 is the bending section, 13 is the supporting section, 14 is the perfusion passage, 15 is the pulling wire, 16 is the ultrasound signal transmission cable, 17 is the energy transmission wire, 18 is the temperature signal transmission wire, 2 is the ultrasound transducer, 21 is the ultrasound fan diagram, 3 is the ablation head electrode, 31 is the perfusion hole, 4 is the positioning electrode, 5 is the temperature sensor, 6 is the operating handle, 61 is the deflection knob, 62 is the ultrasound signal transmission connector, 63 is the ablation energy transmission connector, 64 is the perfusion passage interface, and 65 is the temperature signal transmission connector. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] The core of the utility model is to provide an ablation catheter, which can observe the ablation site in real time. Another core of the utility model is to provide an ablation system including the ablation catheter, which can guide ablation according to the real-time ultrasound image of the ablation site.

[0037] Please refer to Figure 1 and Figure 2 An embodiment of the utility model provides an ablation catheter, including a catheter body 1, an ultrasonic transducer 2, an ablation head electrode 3 and a positioning electrode 4. The catheter body 1 includes a head end 11 and a curved section 12 connected to the head end 11; the ultrasonic transducer 2 is arranged in the head end 11 along the radial direction of the catheter body 1 so as to obtain an ultrasonic fan image 21 in the forward direction of the head end 11; the ablation head electrode 3 is arranged on the outer surface of the head end 11, and is used to ablate the target position, and the part of the ablation head electrode 3 corresponding to the ultrasonic fan image 21 is configured to allow ultrasound to pass through; the positioning electrode 4 is arranged on the outer peripheral surface of the curved section 12, and is used to locate the target position.

[0038] That is to say, the embodiment of the utility model integrates the ultrasonic transducer 2 into the ablation catheter, and sets the ultrasonic transducer 2 along the radial direction of the catheter body 1, so that the ultrasonic transducer 2 can obtain the ultrasonic fan image 21 in the front direction of the head end 11. In this way, when the ablation catheter is placed in the human body, the tissue structure in the target position in the front direction of the head end 11 can be identified under the guidance of the ultrasonic fan image 21, and the distance between the ultrasonic image of the ablation head electrode 3 in the ultrasonic fan image 21 and the ultrasonic image of the target position (that is, the position to be ablated, such as the local lesion point tissue in the human heart) can be observed to adjust the degree of contact between the ablation head electrode 3 and the target position, ensuring that the ablation head electrode 3 and the target position remain in stable contact throughout the ablation process, thereby ensuring the safety and effectiveness of the ablation. In addition, during the ablation process, the thickness of the target position can be detected through the ultrasonic fan image 21 to avoid perforation; and the acoustic difference of the target position tissue before and after ablation can be detected through the ultrasonic fan image 21, and the ablation depth can be fed back accordingly.

[0039] It can be seen that the embodiments of the utility model, by combining forward ultrasonic imaging and ablation catheter, can guide ablation at close range and monitor ablation complications, and are particularly suitable for the treatment of special bypass pathways, free walls, and idiopathic ventricular arrhythmias; moreover, it can directly observe the ablation depth of the lesion point and judge the ablation effect, which is helpful in guiding doctors to select appropriate ablation energy, ablation time, ablation power, etc.

[0040] It should be noted that the ablation catheter is mainly used for the treatment of arrhythmia-related diseases. For example, taking the most common papillary muscle as an example, the papillary muscle is connected to the atrioventricular valve and ventricular muscle through chordae tendineae. The papillary muscle has a tip, and the tip is a cone-like protrusion, starting from the junction of the middle and lower 1 / 3 of the ventricular wall, so the papillary muscle is also a positioning mark of the valve commissure. In the prior art, the three-dimensional structure of the papillary muscle cannot be displayed by X-ray fluoroscopy and three-dimensional electrophysiological mapping, so the ablation success rate of ventricular arrhythmia (PMVA) originating from the ventricular papillary muscle is low. However, by using the ablation catheter provided by the embodiment of the utility model, the ultrasonic fan image 21 of the front of the head end 11 can be obtained through the ultrasonic transducer 2, so that the real-time structure of the ventricular papillary muscle can be intuitively presented, so as to directly guide the ablation catheter to accurately map and ablate, thereby improving the ablation success rate of ventricular arrhythmia (PMVA) originating from the ventricular papillary muscle.

[0041] In addition, the embodiment of the utility model obtains electrical signals near the target position by setting the ablation head electrode 3 and the positioning electrode 4, so as to locate the target position and facilitate the doctor to accurately determine the target position. The positioning electrode 4 is arranged on the outer peripheral surface of the curved section 12, which is conducive to obtaining electrical signals in different deflection directions near the target position when the curved section 12 deflects, which is conducive to more accurate positioning of the target position.

[0042] It should be noted that the present embodiment does not limit the specific number of the positioning electrodes 4 , as long as the positioning electrodes 4 cooperate with the ablation head electrodes 3 to achieve the positioning of the target position.

[0043] In some embodiments, the number of positioning electrodes 4 is N, N is an odd number, and the ablation head electrode 3 and the N positioning electrodes 4 are configured as (N+1) / 2 mapping electrode pairs for locating the target position. It should be noted that the ablation head electrode 3 and one positioning electrode 4 form a mapping electrode pair, and any two positioning electrodes 4 form a mapping electrode pair, and one mapping electrode pair collects electrical signal information of one position; the more the number of mapping electrode pairs, the more electrical signal information collected at different positions, and by comparing the electrical signals at different positions near the target position, the doctor can accurately determine the target position, that is, the position of the lesion.

[0044] Please continue to refer to Figure 1 For example, in some embodiments, N=3. That is, the number of the positioning electrodes 4 is three, and the three positioning electrodes 4 and the ablation head electrode 3 form two mapping electrode pairs for quickly locating the position to be ablated.

[0045] In addition, this embodiment does not limit the shape of the positioning electrode 4. Figure 1 As shown, in some embodiments, the positioning electrode 4 is a ring electrode, and N ring electrodes are arranged at intervals along the axial direction of the curved section 12. The ring electrodes can be arranged at equal intervals or not. This is conducive to collecting more comprehensive and accurate electrical signal information near the target position.

[0046] In addition, the embodiments of the present invention do not limit the specific material of the positioning electrode 4. In some embodiments, the positioning electrode 4 includes a platinum-iridium alloy electrode.

[0047] For further information, please refer to Figure 3 In some embodiments, the ablation head electrode 3 is provided with a perfusion hole 31, and the catheter body 1 is provided with a perfusion passage 14 connected to the perfusion hole 31. The perfusion passage 14 is used to pass the functional agent when the ablation head electrode 3 is ablated. It should be noted that the present embodiment does not limit the specific type of the functional agent. For example, in some embodiments, the functional agent is heparin saline. When the ablation head electrode 3 discharges and ablates, heparin saline is passed into the perfusion passage 14, so that the heparin saline flows out from the perfusion hole 31, and the heparin saline flushes the ablation head electrode 3 and the surface of the human tissue, so as to achieve the purpose of reducing the temperature of the ablation head electrode 3 and the surface of the human tissue, thereby reducing the risk of scab and thrombosis. In addition, the radio frequency energy used for ablation has a higher conduction efficiency in heparin saline, which can make the ablation energy reach the ablation site better. Of course, in other embodiments, the functional agent can also be a therapeutic drug.

[0048] It should be noted that the present embodiment does not limit the specific number of the perfusion holes 31, and the number of the perfusion holes 31 may be one or at least two. When the number of the perfusion holes 31 is more than two, all the perfusion holes 31 are evenly distributed along the circumference of the head end 11. For example, in some embodiments, the number of the perfusion holes 31 is two, and the two perfusion holes 31 are symmetrically distributed on the head end 11.

[0049] For further information, please refer to Figure 3 In some embodiments, a temperature sensor 5 is provided in the tip end 11 to provide real-time feedback of the temperature of the tip end 11 during the ablation process. That is, in this embodiment, the temperature sensor 5 is used to detect the temperature of the tip end 11 in real time during the ablation process, so that the operator can adjust the perfusion flow of the heparin saline solution in real time according to the temperature detected by the temperature sensor 5, thereby achieving the purpose of adjusting the temperature of the tip end 11 in real time.

[0050] Also, please refer to Figure 1 In order to facilitate the introduction of functional agents into the perfusion passage 14, in some embodiments, the end of the catheter body 1 away from the head end 11 is connected to the operating handle 6, and the operating handle 6 is provided with a perfusion passage interface 64, which is connected to the perfusion passage 14 to allow the functional agent to be introduced into the perfusion passage 14 through the perfusion passage interface 64.

[0051] For further information, please refer to Figure 1 In order to facilitate the temperature sensor 5 to provide real-time feedback on the temperature of the head end 11 during the ablation process, in some embodiments, the operating handle 6 is provided with a temperature signal transmission connector 65, and the temperature sensor 5 is connected to the temperature signal transmission connector 65 via a temperature signal transmission wire 18 passing through the catheter body 1. The temperature signal transmission connector 65 is used to connect to a temperature display device so that the operator can obtain the temperature detected by the temperature sensor 5 in real time.

[0052] In addition, please combine Figure 1 and Figure 3 In some embodiments, the operating handle 6 is provided with a deflection knob 61, and a pulling wire 15 is connected between the deflection knob 61 and the bending section 12. When the deflection knob 61 is rotated, the pulling wire 15 drives the bending section 12 to adjust the curvature so as to deflect the head end 11. In other words, in this embodiment, by rotating the deflection knob 61, the pulling wire 15 drives the bending section 12 to change its shape, thereby achieving the deflection of the head end 11, so that the head end 11 can reach any desired target position, which is simple to operate and convenient to use.

[0053] It should be noted that the present embodiment does not limit the specific connection method between the deflection knob 61 and the pull wire 15, as long as the deflection knob 61 rotates, it can drive the pull wire 15 to move to change the orientation or deflection angle of the head end 11. The specific connection method between the deflection knob 61 and the pull wire 15 can refer to the prior art. In addition, the present embodiment does not limit the specific number of the pull wires 15. The more the number of the pull wires 15, the more orientations the head end 11 can be deflected, and the finer the adjustment of the deflection of the head end 11. In some embodiments, the number of the pull wires 15 is two.

[0054] Further, please continue to combine Figure 1 and Figure 3 In order to connect the ultrasonic transducer 2 to the ultrasonic signal processor outside the ablation catheter, in some embodiments, the operating handle 6 is provided with an ultrasonic signal transmission connector 62, and the ultrasonic transducer 2 is connected to the ultrasonic signal transmission connector 62 through an ultrasonic signal transmission cable 16 passed through the catheter body 1. The ultrasonic signal transmission connector 62 is used to connect to the ultrasonic signal processor so that the ultrasonic signal can be processed by the ultrasonic signal processor to obtain an ultrasonic fan image 21 forward of the head end 11 of the catheter body 1.

[0055] Also, please continue to combine Figure 1 and Figure 3 In order to facilitate the connection of the ablation head electrode 3 and the positioning electrode 4 to the ablation device outside the ablation catheter, in some embodiments, the operating handle 6 is provided with an ablation energy transmission connector 63, and the ablation head electrode 3 and the positioning electrode 4 are respectively connected to the ablation energy transmission connector 63 through the energy transmission wire 17 penetrating the catheter body 1, and the ablation energy transmission connector 63 is used to connect the ablation device. It should be noted that in the embodiment of the utility model, the ablation device can be a radiofrequency ablation device, a pulse generator, or an integrated device that can freely switch between transmitting radiofrequency energy and pulse energy. When the ablation device is a radiofrequency ablation device, the radiofrequency ablation device transmits high-frequency current to the ablation head electrode 3, and when the ablation device is a pulse generator, the pulse generator transmits pulse current to the ablation head electrode 3. When the ablation device is an integrated device, the doctor can select appropriate ablation energy (radiofrequency ablation energy or pulse ablation energy) according to the different lesions during the operation and the actual physical condition of the patient to reduce the risk of the operation.

[0056] In addition, in order to allow the ultrasound of the ultrasound transducer 2 to pass through the ablation head electrode 3 better, in some embodiments, the portion of the ablation head electrode 3 corresponding to the ultrasound fan diagram 21 includes several metal layers, and the thickness of each metal layer is less than 1 μm. It can be understood that an extremely thin metal layer is conducive to the passage of ultrasound. In this embodiment, by setting several layers of metal layers less than 1 μm, it is ensured that the ultrasound of the ultrasound transducer 2 can pass smoothly from the ablation head electrode 3, thereby forming an ultrasound fan diagram 21 facing forward of the head end 11. It should be noted that while allowing ultrasound to pass through, the metal layer needs to support current transmission and have sufficient hardness so that the metal layer can be directly used as an electrode.

[0057] In order to obtain a clearer ultrasound fan image 21, in some embodiments, the ultrasound transducer 2 has a frequency of 10 MHz or more. It is understandable that the higher the frequency of the ultrasound transducer 2, the higher the image resolution of the obtained ultrasound fan image 21, and the more subtle changes in the tissue before and after ablation can be distinguished. The ablation depth can be quantified by the acoustic difference of the tissue before and after ablation, and whether a transmural tissue injury is formed at the lesion can be determined.

[0058] In addition, in order to facilitate the electrical connection of the ultrasonic transducer 2, in some embodiments, the side of the ultrasonic transducer 2 away from the front of the head end 11 or the side of the ultrasonic transducer 2 toward the circumference of the head end 11 is connected to a flexible circuit board. That is to say, in this embodiment, a flexible circuit board is provided to facilitate the electrical connection of the ultrasonic transducer 2. The flexible circuit board is provided on the side of the ultrasonic transducer 2 away from the front of the head end 11 or the side of the ultrasonic transducer 2 toward the circumference of the head end 11, so as to avoid interference with the working surface of the ultrasonic transducer 2 in transmitting or receiving ultrasonic signals. In some embodiments, the ultrasonic transducer 2 is connected to the flexible circuit board, and the end of the flexible circuit board away from the ultrasonic transducer 2 is connected to the ultrasonic signal transmission connector 62 through the ultrasonic signal transmission cable 16.

[0059] It should be noted that, in the embodiment of the utility model, the catheter body 1 further includes a support section 13, and the support section 13 is connected to the end of the curved section 12 away from the head end 11. In addition, the embodiment of the utility model does not limit the specific material of the catheter body 1. In some embodiments, the curved section 12 is made of a flexible polymer material or a metal braided material; the support section 13 includes an inner layer, an outer layer and an intermediate layer disposed between the inner layer and the outer layer. The inner layer and the outer layer can be made of a polymer material with good biocompatibility, and the intermediate layer can be a steel wire braided tube body. The polymer material includes polyurethane, nylon, polytetrafluoroethylene, etc.

[0060] In addition to the above-mentioned ablation catheter, the present invention also provides an ablation system including the ablation catheter disclosed in the above-mentioned embodiment. The structures of other parts of the ablation system are referred to the prior art and will not be described in detail herein. The ablation system is characterized in that the ablation catheter disclosed in the above-mentioned embodiment is used. Since the above-mentioned ablation catheter can obtain the ultrasonic fan image 21 of the front of the head end 11 by using the ultrasonic transducer 2, it has the above-mentioned beneficial effects, and therefore the ablation can be guided according to the ultrasonic fan image 21 of the ablation site.

[0061] Further, in some embodiments, the ablation catheter includes an ultrasonic signal transmission connector 62 and an ablation energy transmission connector 63, the ultrasonic signal transmission connector 62 is connected to the ultrasonic transducer 2 of the ablation catheter, and the ablation energy transmission connector 63 is respectively connected to the ablation head electrode 3 and the positioning electrode 4 of the ablation catheter; the ablation system includes an ablation instrument and an ultrasonic control device, the ablation instrument is connected to the ablation energy transmission connector 63, and the ultrasonic control device is connected to the ultrasonic signal transmission connector 62. That is to say, this embodiment facilitates the connection between the ablation instrument and the ablation head electrode 3 and the positioning electrode 4, and the connection between the ultrasonic control device and the ultrasonic transducer 2 by providing the ultrasonic signal transmission connector 62 and the ablation energy transmission connector 63, thereby realizing the transmission of ultrasonic signals and ablation energy.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The ablation catheter and ablation system provided by the utility model are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An ablation catheter, characterized in that: include: A catheter body (1) comprising a head end (11) and a curved section (12) connected to the head end (11); An ultrasonic transducer (2) is arranged inside the head end (11) along the radial direction of the catheter body (1), so that the ultrasonic transducer (2) can obtain an ultrasonic fan image (21) in the forward direction of the head end (11); an ablation head electrode (3), arranged on the outer surface of the head end (11), and used for ablating a target position, wherein the portion of the ablation head electrode (3) corresponding to the ultrasound sector image (21) is configured to allow ultrasound to pass through; A positioning electrode (4) is arranged on the outer peripheral surface of the curved section (12) and is used to locate the target position.

2. The ablation catheter according to claim 1, characterized in that: The number of the positioning electrodes (4) is N, where N is an odd number. The ablation head electrode (3) and the N positioning electrodes (4) are configured as (N+1) / 2 mapping electrode pairs for positioning the target position.

3. The ablation catheter according to claim 2, characterized in that: The positioning electrode (4) is a ring electrode, and N ring electrodes are arranged at intervals along the axial direction of the curved section (12).

4. The ablation catheter according to any one of claims 1 to 3, characterized in that: The ablation head electrode (3) is provided with an irrigation hole (31), and the catheter body (1) is provided with an irrigation passage (14) connected to the irrigation hole (31). The irrigation passage (14) is used to introduce a functional agent when the ablation head electrode (3) is ablated.

5. The ablation catheter according to claim 4, characterized in that: A temperature sensor (5) is provided inside the head end (11) for providing real-time feedback of the temperature of the head end (11) during the ablation process.

6. The ablation catheter according to any one of claims 1 to 3, characterized in that: One end of the catheter body (1) away from the head end (11) is connected to an operating handle (6), and the operating handle (6) is provided with a deflection knob (61). A pulling wire (15) is connected between the deflection knob (61) and the bending section (12). When the deflection knob (61) rotates, the pulling wire (15) drives the bending section (12) to adjust the curvature, so as to deflect the head end (11).

7. The ablation catheter according to claim 6, characterized in that: The operating handle (6) is provided with: An ultrasonic signal transmission connector (62), the ultrasonic transducer (2) being connected to the ultrasonic signal transmission connector (62) via an ultrasonic signal transmission cable (16) inserted into the catheter body (1); An ablation energy transmission connector (63), wherein the ablation head electrode (3) and the positioning electrode (4) are respectively connected to the ablation energy transmission connector (63) via energy transmission wires (17) passing through the catheter body (1).

8. The ablation catheter according to any one of claims 1 to 3, characterized in that: The portion of the ablation head electrode (3) corresponding to the ultrasonic fan image (21) comprises a plurality of metal layers, and the thickness of each metal layer is less than 1 μm.

9. The ablation catheter according to any one of claims 1 to 3, characterized in that: The side of the ultrasonic transducer (2) facing away from the front of the head end (11) or the side of the ultrasonic transducer (2) facing the circumference of the head end (11) is connected to a flexible circuit board.

10. An ablation system, characterized in that: The ablation catheter comprises the ablation catheter described in any one of claims 1-9.

11. The ablation system according to claim 10, characterized in that: The ablation catheter comprises an ultrasound signal transmission connector (62) and an ablation energy transmission connector (63), wherein the ultrasound signal transmission connector (62) is connected to the ultrasound transducer (2) of the ablation catheter, and the ablation energy transmission connector (63) is respectively connected to the ablation head electrode (3) and the positioning electrode (4) of the ablation catheter; The ablation system comprises an ablation instrument and an ultrasonic control device, wherein the ablation instrument is connected to the ablation energy transmission connector (63), and the ultrasonic control device is connected to the ultrasonic signal transmission connector (62).

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