Ablation Device

Abstract

The present invention discloses an ablation device. The ablation device comprises an ablation catheter body and a control circuit. The end of the ablation catheter body is an ablation section. The outer surface of the ablation section is provided with a plurality of electrodes distributed at intervals. Each electrode is connected to the control circuit through a wire, and the control circuit controls the on and off of each electrode. The present invention solves the technical problem that the discharge range of the ablation catheter in the prior art is uncontrollable.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to an ablation device. Background Art

[0002] Catheter ablation technology using radiofrequency energy is one of the most widely used minimally invasive treatments for arrhythmias. It releases radiofrequency energy locally in the lesion, and causes coagulative necrosis in the local deep tissue through the conduction of impedance heat, thereby achieving the purpose of eradicating the lesion and curing the disease. Among them, the stability of the ablation catheter and tissue adhesion is one of the important factors that determine whether the treatment is effective. If the adhesion is not good, the effective contact area between the catheter and the tissue is reduced, more heat is transferred to the flowing blood flow, and the temperature of the deep tissue is lower than the effective ablation temperature, which can only cause local tissue edema, affecting further ablation. When the adhesion is too strong, on the one hand, the rapid rise in temperature will form charring on the surface of the tissue and the local electrode, and the rapid rise in impedance will reduce the effective transmission of ablation energy. On the other hand, it will also increase the risk of embolism and pericardial tamponade. Therefore, during the ablation process, it is very important to keep the ablation catheter in good contact with the electrode.

[0003] Although radiofrequency catheter ablation has achieved good results in many types of arrhythmias, it is still challenging in atrial fibrillation and ventricular arrhythmias originating from papillary muscles. The main reason is that the anatomical structure of the above two parts is relatively complex. The pulmonary vein crest is a thick muscle sleeve formed by the intersection of the bifurcation of the main pulmonary vein. The residual pulmonary vein potential on it is one of the important factors leading to recurrence or failure of atrial fibrillation ablation. The surgeon needs to point the end of the catheter directly to the crest during ablation, but the crest itself is not a flat structure and is easy to slide during ablation, resulting in unstable pressure. Left ventricular papillary muscle-related ventricular premature beats mostly originate from the middle and distal segments of the papillary muscles. The surgeon needs to place the ablation catheter against the lesion in the air. The pressure is based on the lateral force, the front end of the catheter has no contact, and the support force of the rear is poor, resulting in the inability of the ablation energy to effectively enter the tissue.

[0004] The ablation catheter in the prior art can only discharge or not discharge in a certain area at the end of the catheter, and the discharge range is uncontrollable, so insufficient or excessive ablation may occur due to the discharge range being too small or too large. If excessive ablation occurs, excessive damage to the papillary muscle may cause ischemic necrosis of the papillary muscle, leading to dysfunction of the mitral valve / tricuspid valve, resulting in serious clinical consequences.

[0005] With respect to the problem that the discharge range of the ablation catheter in the prior art is uncontrollable, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiment of the present invention provides an ablation device to at least solve the technical problem in the prior art that the discharge range of the ablation catheter is uncontrollable.

[0007] According to one aspect of an embodiment of the present invention, there is provided an ablation device, including an ablation catheter body and a control circuit. The end of the ablation catheter body is an ablation segment. A plurality of electrodes distributed at intervals are arranged on the outer surface of the ablation segment. Each electrode is connected to the control circuit via a wire, and the control circuit controls the on and off of each electrode.

[0008] Furthermore, the ablation device also includes an irrigation channel and an irrigation hole. The irrigation channel is arranged in the ablation catheter body and extends out of the ablation catheter body along the axial direction of the ablation catheter body. One or more irrigation holes are arranged on some or all of the electrodes, and the irrigation holes are connected to the irrigation channel.

[0009] Furthermore, the ablation device also includes an operating handle connected to the ablation catheter body, the control circuit is arranged in the operating handle, the operating handle includes one or more operating keys, the one or more operating keys are connected to the control circuit, and the one or more operating keys are used to select one or more electrodes for on-off switching operation.

[0010] Furthermore, the ablation device also includes a metal mesh braided layer, and the metal mesh braided layer loop is arranged inside the outer surface of the ablation catheter body.

[0011] Furthermore, the ablation device also includes a bending component and a bending key. The bending component is arranged inside the ablation catheter body, and the bending key is arranged on the operating handle. One end of the bending component is connected to the metal mesh braided layer at a specific distance from the end of the ablation catheter body, and the other end of the bending component is connected to the bending key.

[0012] Furthermore, the ablation device also includes a circuit channel, which is arranged in the ablation catheter body and is used to connect the wire to the control circuit along the circuit channel.

[0013] Furthermore, the ablation device also includes a plurality of thermistors, and a thermistor is disposed inside each electrode.

[0014] Furthermore, all or part of the ablation catheter body is made of a polymer flexible composite material.

[0015] Furthermore, an electrode is provided at the end of the ablation segment, and the length of the electrode provided at the end of the ablation segment is greater than the lengths of other electrodes.

[0016] Furthermore, a plurality of electrodes are evenly arranged on the ablation segment.

[0017] In the embodiment of the present invention, since a plurality of electrodes distributed at intervals are provided on the outer surface of the ablation segment and each electrode is connected to the control circuit via a wire, the on and off of each electrode can be controlled by the control circuit to achieve selective discharge of a single or multiple electrodes, thereby improving the accuracy and effectiveness of ablation and achieving the technical effect of precise treatment, thereby solving the technical problem of uncontrollable discharge range of the ablation catheter in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of an ablation device according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of electrode distribution of an ablation device according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of a perfusion channel of an ablation device according to an embodiment of the present invention;

[0022] Figure 4 FIG. 1 is a cross-sectional view of an ablation device according to an embodiment of the present invention. Figure 1 ;

[0023] Figure 5 FIG. 1 is a cross-sectional view of an ablation device according to an embodiment of the present invention. Figure 2 ;

[0024] Figure 6 is a schematic diagram of the overall structure of an ablation device according to an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of the structure of an operation panel according to an embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of the structure of an operation panel according to an embodiment of the present invention;

[0027] Fig. 9 is a schematic diagram of a bending state of an ablation device according to an embodiment of the present invention;

[0028] Fig.10 It is a schematic diagram of the actual application of an ablation device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] Example 1

[0032] According to an embodiment of the present invention, a product embodiment of an ablation device is provided. Figure 1 is an ablation device according to an embodiment of the present invention, such as Figure 1 As shown, the device includes an ablation catheter body 100 and a control circuit 200. The end of the ablation catheter body 100 is an ablation segment. A plurality of electrodes 101 distributed at intervals are arranged on the outer surface of the ablation segment. Each electrode 101 is connected to the control circuit 200 via a wire 102, and the control circuit 200 controls the on and off of each electrode 101.

[0033] Specifically, Figure 1 As shown, the ablation catheter body 100, the control circuit 200, the electrode 101 and the wire 102 are all components of the ablation device of the present invention. One end of the ablation catheter body 100 is the end, and the other end is connected to the control circuit. There can be multiple electrodes 101 that are separated from each other. Figure 1 As shown in the numbers, eight electrodes can be provided, namely electrode 1, electrode 2, electrode 3, ..., electrode 8. The control circuit 200 can control the power on and off of each electrode 101. Through the circuit control of the control circuit 200, a certain electrode 101 or several electrodes 101 can be individually made to perform selective regional discharge. For example, one electrode 101 can be controlled to be powered on, while the other electrodes 101 are powered off, or two electrodes 101 can be controlled to be powered on, while the other electrodes 101 are powered off, etc. Optionally, the shape of the electrode 101 can be annular and / or disc-shaped, and is sleeved on the outer surface of the ablation catheter body 100, wherein the electrode 101 can be a platinum electrode.

[0034] In the embodiment of the present invention, since a plurality of electrodes distributed at intervals are provided on the outer surface of the ablation segment and each electrode is connected to the control circuit via a wire, the on and off of each electrode can be controlled by the control circuit to achieve selective discharge of a single or multiple electrodes, thereby improving the accuracy and effectiveness of ablation and achieving the technical effect of precise treatment, thereby solving the technical problem of uncontrollable discharge range of the ablation catheter in the prior art.

[0035] In addition, the ablation device of the present invention has a simple appearance and manufacturing process, and can adapt to large-scale production. It can not only meet the ablation needs of most ordinary patients, but also meet the ablation characteristics of arrhythmias related to special anatomical parts.

[0036] In an optional embodiment, an electrode 101 is provided at the end of the ablation segment, and the length of the electrode 101 provided at the end of the ablation segment is greater than the lengths of other electrodes 101 .

[0037] Specifically, one electrode 101 among the multiple electrodes 101 may be arranged at the end of the ablation segment, and the other electrodes 101 are arranged at other positions of the ablation segment, and the length of the electrode 101 arranged at the end of the ablation segment is longer than that of the other electrodes 101, wherein the electrode 101 arranged at the end of the ablation segment may be disc-shaped, and the other electrodes 101 may be ring-shaped; in a specific embodiment, Figure 2 As shown, the length of the electrode 101 disposed at the end of the ablation section can be set to 4 mm, and the length of the remaining electrodes 101 is 2 mm. It should be noted here that the length of the electrode 101 can be designed according to actual conditions, and the present invention only provides one feasible size design.

[0038] In an optional embodiment, a plurality of electrodes 101 are evenly arranged on the ablation section.

[0039] like Figure 2 As shown, the spacing between each electrode 101 can be set to be the same, for example, the spacing between each electrode 101 can be set to 1 mm. Optionally, the diameter of the ablation catheter body 100 can be set to 2.5 mm-2.7 mm. It should be noted here that the spacing between each electrode 101 and the diameter of the ablation catheter body 100 can be designed according to actual conditions. The present invention only provides one feasible size design.

[0040] In an optional embodiment, all or part of the ablation catheter body 100 is made of a polymer flexible composite material.

[0041] Specifically, the polymer flexible composite material has plasticity, which is conducive to the realization of various shapes of the ablation catheter body 100. The ablation catheter body 100 can be straight or bent into other shapes. Optionally, the polymer flexible composite material can be polyurethane.

[0042] In an optional embodiment, if Figure 3 Shown and Figure 4 As shown, the ablation device also includes an irrigation channel 103 and an irrigation hole 104. The irrigation channel 103 is arranged in the ablation catheter body 100 and extends out of the ablation catheter body 100 axially along the ablation catheter body 100. One or more irrigation holes 104 are arranged on some or all of the electrodes 101, and the irrigation holes 104 are connected to the irrigation channel 103.

[0043] Specifically, each electrode 101 may be provided with one or more perfusion holes 104, which are connected to the perfusion channel 103, and saline or other liquid substances may enter the body through the perfusion channel 103 and the perfusion holes 104. Optionally, a hydrophobic coating may be coated inside the perfusion channel 103 to prevent the electrode 101 from short-circuiting.

[0044] In an optional embodiment, if Figure 4 and Figure 5 As shown, in addition to the irrigation channel 104 , the ablation device further includes a circuit channel 105 . The circuit channel 105 is disposed in the ablation catheter body 100 and is used to connect the wire 102 to the control circuit 200 along the circuit channel 105 .

[0045] In an optional embodiment, if Figure 6 As shown, the ablation device also includes an operating handle 300 connected to the ablation catheter body 100. The control circuit 200 can be set in the operating handle 300. The operating handle 300 includes one or more operating keys, and the one or more operating keys are connected to the control circuit 200. The one or more operating keys are used to select one or more electrodes 101 for on-off switching operation.

[0046] Specifically, the circuit information can be input into the control circuit 200 through the operation key on the operating handle 300, and the discharge mode of the electrode 101 can be controlled through the transmission of the wire 102, so as to realize the selective discharge of the ablation device and realize accurate discharge; Figure 6 As shown, the upper side of the tail of the operating handle 300 is an extended perfusion channel 103, and the lower side is an electrode tail wire. The operating handle 300 can be connected to a three-dimensional mapping system and a radiofrequency ablation instrument through the electrode tail wire at its tail.

[0047] Specifically, the discharge mode of the electrode 101 may include a unipolar discharge mode and a bipolar discharge mode. The unipolar discharge mode refers to a discharge mode in which a certain electrode 101 is used as a positive electrode to form a circuit with a negative electrode patch attached to the subject; the bipolar discharge mode refers to a discharge mode in which a circuit is formed between two electrodes 101 as positive and negative electrodes. It should be noted here that in addition to the above two discharge modes, there may also be other modes, such as selecting two non-adjacent electrodes 101 for discharge, selecting multiple pairs of electrodes 101 for discharge, etc.

[0048] Specifically, the operating handle 300 may be provided with: Figure 7 and Figure 8 The operation panel shown in the figure has operation keys set on it, such as Figure 7 and Figure 8 As shown in the figure, the shaded blocks are operation keys. The upper part of the operation panel is the unipolar discharge selection mode, and the lower part is the bipolar discharge selection mode. When the slider in the bipolar discharge mode is in the Figure 7 When the slider is in the "None" position in the bipolar discharge mode, the default selection is the unipolar discharge mode. When the slider is selected as 3 in the unipolar discharge mode, the third electrode is used as the positive electrode for discharge. When the slider is not in the "None" position in the bipolar discharge mode, such as Figure 8 As shown, the bipolar discharge mode is selected. When the slider is in the Figure 8 It should be noted that the operation panel and operation keys can be set according to actual conditions. The present invention only gives one example. The setting of the operation panel and operation keys can meet the mode selection requirements.

[0049] In an optional embodiment, the ablation device further includes a metal mesh braided layer, and the metal mesh braided layer is disposed inside the outer surface of the ablation catheter body.

[0050] Specifically, the metal mesh braided layer may be a stainless steel wire mesh layer, and the metal mesh braided layer may ensure the plastic stability and torque of the ablation catheter body 100 .

[0051] In an optional embodiment, if Figure 6 As shown, the ablation device also includes a bending component and a bending key 301. The bending component is arranged inside the ablation catheter body 100, and the bending key 301 is arranged on the operating handle 300. One end of the bending component is connected to the metal mesh braided layer at a specific distance from the end of the ablation catheter body 100, and the other end of the bending component is connected to the bending key 301.

[0052] Specifically, the ablation catheter used in the prior art is shaped into a curved shape, which is not suitable for local ablation of a specific anatomical position. However, the present invention can achieve a variety of shapes of the ablation catheter body by setting a bending component and a bending key 301. Optionally, the bending component can be a bending wire, which can be set 7-8 cm away from the end of the ablation catheter body 100. The bending key 301 can be a bending knob. Since one end of the bending component is connected to the inner wall of the ablation catheter body 100 and the other end is connected to the bending key 301, when the bending key 301 is rotated, the ablation catheter body 100 will bend according to the rotation. Fig. 9 As shown, when the ablation catheter body 100 is about 135-140 mm long and its in vivo length that can penetrate into the sheath is 115-120 mm, the maximum bending diameter of the ablation catheter body 100 can reach 45 mm-55 mm.

[0053] Specifically, the length of the metal mesh braided layer may extend from the position where the bending wire is set to the operating handle 300 .

[0054] In an optional embodiment, the ablation device further includes a plurality of thermistors, and a thermistor is disposed inside each electrode 101 .

[0055] Specifically, each electrode 101 has a thermistor inside to realize the temperature sensing function during ablation.

[0056] In a specific embodiment, Fig.10 As shown, Fig.10 As shown in the figure, a ventricular premature beat originates from the middle segment of the left posterior papillary muscle of the left ventricle. When the end of the ablation catheter body 100 is against the root of the papillary muscle, it can directly contact the papillary muscle. At this time, the 4th to 5th electrodes at the end of the ablation catheter body 100 selectively discharge, and ablation treatment can be directly performed on the origin site of the ventricular premature beat.

[0057] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0058] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ablation device, characterized in that: It comprises an ablation catheter body and a control circuit, wherein the end of the ablation catheter body is an ablation section, and a plurality of electrodes distributed at intervals are arranged on the outer surface of the ablation section, each of the electrodes is connected to the control circuit through a wire, and the control circuit controls the on and off of each of the electrodes; The ablation device also includes an operating handle connected to the ablation catheter body, the control circuit is arranged in the operating handle, the operating handle includes one or more operating keys, the one or more operating keys are connected to the control circuit, and the one or more operating keys are used to select one or more of the electrodes for on-off switching operation; the lower side of the tail of the operating handle is an electrode tail wire, and the operating handle is connected to the three-dimensional mapping system and the radio frequency ablation instrument through the electrode tail wire at its tail. The discharge mode of the electrode includes a unipolar discharge mode and a bipolar discharge mode. The unipolar discharge mode refers to a discharge mode in which a certain electrode is used as the positive electrode to form a circuit with the negative electrode patch attached to the subject; the bipolar discharge mode refers to a discharge mode in which a certain two electrodes are used as the positive electrode. The electrodes are used as positive and negative poles to form a discharge mode of a loop, an operation panel is provided on the operation handle, and operation keys are provided on the operation panel. The shaded squares in the operation panel are the operation keys. The upper part of the operation panel is a unipolar discharge selection mode, and the lower part is a bipolar discharge selection mode. When the slider in the bipolar discharge mode is at the "none" position, the unipolar discharge mode is selected by default. When the slider in the unipolar discharge mode is selected as 3, the third electrode is used as the positive pole for discharge; when the slider in the bipolar discharge mode is not at the "none" position, the bipolar discharge mode is selected. When the slider in the unipolar discharge mode is at the position of 3 and the slider in the bipolar discharge mode is at the position of 1, the first electrode and the third electrode are used as the positive and negative poles for discharge; The ablation device further comprises a metal mesh braided layer, and the metal mesh braided layer is arranged inside the outer surface of the ablation catheter body; The ablation device also includes a bending component and a bending key. The bending component is arranged inside the ablation catheter body, and the bending key is arranged on the operating handle. One end of the bending component is connected to the metal mesh braided layer at a specific distance from the end of the ablation catheter body, and the other end of the bending component is connected to the bending key. The bending key is a bending knob, and the bending component is a bending wire. When the bending key is rotated, the ablation catheter body will bend according to the rotation. The length of the metal mesh braided layer extends from the position where the bending wire is set to the operating handle.

2. The ablation device according to claim 1, characterized in that: The ablation device also includes an irrigation channel and an irrigation hole. The irrigation channel is arranged in the ablation catheter body and extends out of the ablation catheter body axially along the ablation catheter body. One or more irrigation holes are arranged on some or all of the electrodes, and the irrigation holes are connected to the irrigation channel.

3. The ablation device according to claim 1 or 2, characterized in that: The ablation device further comprises a circuit channel, which is disposed in the ablation catheter body and is used to connect the wire to the control circuit along the circuit channel.

4. The ablation device according to claim 1 or 2, characterized in that: The ablation device further comprises a plurality of thermistors, and each of the electrodes is provided with the thermistor inside.

5. The ablation device according to claim 1 or 2, characterized in that: All or part of the ablation catheter body is made of a polymer flexible composite material.

6. The ablation device according to claim 1 or 2, characterized in that: The electrode is disposed at the end of the ablation segment, and the length of the electrode disposed at the end of the ablation segment is greater than the lengths of the other electrodes.

7. The ablation device according to claim 1 or 2, characterized in that: The plurality of electrodes are evenly arranged on the ablation segment.

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