A catheter capable of performing local ablation

Abstract

The present invention relates to the field of electrophysiological ablation, specifically a catheter capable of performing local ablation, comprising a spherical head and a tube body, wherein the spherical head is connected to the distal end of the tube body, and the spherical head comprises a plurality of support arms, a plurality of outer electrodes, and a plurality of inner electrodes; a hollow portion is provided between the support arms, and the support arms are elastic; the outer electrodes are provided on the support arms, and the outer electrodes are flexible planar electrodes, and the shapes of the flexible planar electrodes are one or more of circular, elliptical, and polygonal; the inner electrodes are provided on the support arms and correspond one to one with the outer electrodes, and the inner electrodes are located on the back of the outer electrodes, and the surface area of ​​the inner electrodes is equal to the surface area of ​​the outer electrodes. The present invention simultaneously realizes multi-pole precision mapping, multi-pole high-efficiency ablation, and single-point local fine ablation in the same catheter, and in the case of multiple ablation electrodes, it can also realize the abutment detection of any single outer electrode.

Description

Technical Field

[0001] The present invention relates to the field of electrophysiological ablation, and in particular to a catheter capable of performing local ablation. Background Art

[0002] Currently, point ablation catheters have low ablation efficiency and cannot effectively perform electrophysiological procedures such as pulmonary vein isolation. Ring, basket, and petal electrodes have a large coverage area, but cannot be used to target areas where point ablation is required. In practice, a new point ablation catheter needs to be added, increasing the ablation procedure time and patient costs.

[0003] Currently, the ablation electrode and the mapping electrode are usually two separate catheters, which need to be frequently switched during surgery, increasing the difficulty of the operation and patient costs.

[0004] To ensure the safety and effectiveness of point ablation, pressure monitoring is often required to ensure good contact between the electrode and tissue. However, this feature directly increases the difficulty and cost of catheter manufacturing, and also increases surgical expenses for patients. Furthermore, no existing multipolar ablation catheters offer pressure monitoring capabilities for individual electrodes. Summary of the Invention

[0005] The purpose of the present invention is to address the problem that conventional single-point ablation catheters in the prior art have independent designs for ablation and mapping, making it difficult to achieve both precise mapping and high-efficiency ablation at the same time; single-point ablation catheters with pressure monitoring are difficult to manufacture and costly, and there is no multipolar ablation catheter in the prior art that can monitor the pressure of a single electrode to determine the degree of electrode contact; the existing ablation catheters are unable to combine the efficiency of multipolar ablation catheters with the advantages of local fine-point ablation, and provide a catheter that can perform local ablation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A catheter capable of performing local ablation comprises a spherical head end and a tube body, wherein the spherical head end is connected to the distal end of the tube body, and the spherical head end comprises a plurality of support arms, a plurality of outer electrodes and a plurality of inner electrodes; a hollow portion is provided between the support arms, and the support arms are elastic; the outer electrodes are provided on the support arms, and the outer electrodes are flexible planar electrodes, and the shape of the flexible planar electrodes is one or more of circular, elliptical, and polygonal; the inner electrodes are provided on the support arms and correspond one-to-one with the outer electrodes, and the inner electrodes are located on the back of the outer electrodes, and the surface area of ​​the inner electrodes is equal to the surface area of ​​the outer electrodes.

[0008] In this field, the distal end refers to the front end part of the electrophysiological mapping catheter, that is, the part that first enters the human body, the proximal end refers to the end of the electrophysiological mapping catheter closer to the operator, and the head end is located at the distal end of the electrophysiological mapping catheter, that is, the end that enters the human body.

[0009] By adopting the catheter capable of local ablation described in the present invention, multipolar ablation and mapping can be realized by setting the spherical head end and the plurality of outer electrodes thereon. Local tissue ablation within the plane range can be realized by setting the outer electrodes as flexible plane electrodes, that is, the same catheter can simultaneously realize multipolar precision mapping, multipolar high-efficiency ablation, and single-point local fine ablation. There is no need to replace the catheter during use, which improves efficiency and reduces overall costs. By setting the hollow part and the elastic support arm, the spherical head end can be deformed and restored, which is convenient for entering and exiting the sheath. By setting the hollow part, the spherical head end is hollowed out, so that blood It can enter the interior of the spherical head end, the inner electrode can contact the blood, the surface area of ​​the inner electrode is equal to the surface area of ​​the outer electrode, and can have the same reference standard. By comparing the impedance detection of each pair of the outer electrode and the inner electrode, the degree of adhesion of the outer electrodes can be confirmed. Even in the case of multiple ablation electrodes, the adhesion detection of any single outer electrode can be achieved, which overcomes the problem in the prior art that it is difficult for multi-polar ablation catheters to determine the degree of adhesion of a single electrode through pressure monitoring. It has good practicality, does not require the integration of a pressure sensor on the electrode, and greatly simplifies the design difficulty of the spherical head end.

[0010] As a preferred technical solution of the present invention, the inner electrode and the outer electrode are consistent in shape and size, which facilitates the design and manufacture of the spherical head end.

[0011] As a preferred technical solution of the present invention, the outer electrodes are arranged in layers from the pole of the spherical head end to the equator; the outer electrodes in each layer are evenly arranged; and the outer electrodes in adjacent layers are staggered.

[0012] With this structural setting, the outer electrode can almost completely cover the surface of the spherical head end, so that the working surface suitable for the spherical head end is evenly distributed with electrodes, and can work in all directions. There is no need to adjust the position of the tube body too much to adjust the position of the spherical head end, especially there is no need to rotate the tube body too much to adjust the position of the spherical head end.

[0013] As a further preferred technical solution of the present invention, the number of layers of the outer electrodes is 3 to 5; one outer electrode is set in the first layer; 6 to 10 outer electrodes are set in the remaining layers; at least one layer is close to the equator or located on the equator.

[0014] As a further preferred technical solution of the present invention, the number of layers of the outer electrodes is 4; the first layer is provided with a top outer electrode, and the top outer electrode is arranged opposite to the distal end of the tube body; the second layer is provided with 6 second-layer outer electrodes; the third layer is provided with 6 third-layer outer electrodes, and the third layer is close to the equator or located on the equator; the fourth layer is provided with 6 fourth-layer outer electrodes.

[0015] As a further preferred technical solution of the present invention, the polarities of the outer electrodes of adjacent layers are opposite, so as to be used for bipolar ablation;

[0016] Alternatively, each of the outer electrodes discharges relative to a neutral electrode for monopolar ablation, and the neutral electrode is arranged on the human body.

[0017] As a preferred technical solution of the present invention, an irrigation tube is provided at the distal end of the tube body, and the irrigation tube extends into the spherical head end.

[0018] With this structural setting, during the operation, heparinized saline can be continuously infused into the spherical head end through the infusion tube to perform anticoagulation treatment and avoid the formation of thrombus.

[0019] As a further preferred technical solution of the present invention, the perfusion tube at the intersection of the distal end of the tube body and the spherical head end is provided with a plurality of proximal perfusion channels; the top of the perfusion tube is provided with a plurality of apical perfusion channels; and the perfusion tube between the proximal perfusion channel and the apical perfusion channel is provided with a plurality of distal perfusion channels.

[0020] As a preferred technical solution of the present invention, adjacent support arms are staggered and connected, and intersect and connect on an extension line of the axis of the tube body.

[0021] As a preferred technical solution of the present invention, the proximal end of the tube body is connected to a control handle, and the control handle is provided with a Luer connector.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] 1. The catheter capable of local ablation described in the present invention, by providing the spherical tip and the plurality of outer electrodes thereon, can achieve multipolar ablation and mapping. By configuring the outer electrodes as flexible planar electrodes, local tissue ablation within a planar range can be achieved. That is, the same catheter can simultaneously achieve multipolar precision mapping, multipolar high-efficiency ablation, and single-point local fine ablation. There is no need to replace the catheter during use, thereby improving efficiency and reducing overall costs.

[0024] 2. The catheter capable of performing local ablation of the present invention, by providing the hollow portion and the elastic support arm, enables the spherical head end to deform and recover, facilitating entry and exit of the sheath;

[0025] 3. The catheter capable of performing local ablation described in the present invention has a hollowed-out spherical head end by arranging the hollow portion, so that blood can enter the interior of the spherical head end, and the inner electrode can contact the blood. The surface area of ​​the inner electrode is equal to the surface area of ​​the outer electrode, and can have the same reference standard. By comparing the impedance detection of each pair of the outer electrode and the inner electrode, the degree of contact of the outer electrodes can be confirmed. Even in the case of multiple ablation electrodes, the contact detection of any single outer electrode can be achieved, which overcomes the problem in the prior art that multi-polar ablation catheters are difficult to achieve in determining the contact degree of a single electrode through pressure monitoring. The catheter has good practicality, does not require the integration of a pressure sensor on the electrode, and greatly simplifies the design difficulty of the spherical head end. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the spherical head Figure 1 ;

[0027] Figure 2 Schematic diagram of the planar structure of the spherical head (main view);

[0028] Figure 3 Schematic diagram of the planar structure of the spherical head (top view);

[0029] Figure 4 A schematic diagram of an electrode configuration for a spherical head;

[0030] Figure 5 Schematic diagram of the three-dimensional structure of the spherical head Figure 2 ;

[0031] Figure 6 Schematic diagram of the three-dimensional structure of the spherical head Figure 3 ;

[0032] Figure 7 A schematic diagram of the structure of a catheter capable of performing local ablation;

[0033] Figure 8 Schematic diagram of catheter bending;

[0034] Figure 9 Schematic diagram of the reference electrode and neutral electrode setup;

[0035] Figure 10 Schematic diagram of impedance detection in different parts of the heart.

[0036] Markings in the figure:

[0037] 1- spherical head;

[0038] 2- Support arm;

[0039] 3- hollow part;

[0040] 4-tube body;

[0041] 5-lateral electrode, 51-top lateral electrode, 52-second layer lateral electrode, 53-third layer lateral electrode, 54-fourth layer lateral electrode;

[0042] 6-perfusion tube, 61-proximal perfusion channel, 62-distal perfusion channel, 63-apical perfusion channel;

[0043] 7-medial electrode, 71-top medial electrode, 72-second layer medial electrode, 73-third layer medial electrode, 74-fourth layer medial electrode;

[0044] 8-control handle;

[0045] 9-Luer connector;

[0046] 10-Human body;

[0047] 11-reference electrode;

[0048] 12-neutral electrode;

[0049] 13- Impedance collected by the outer electrodes;

[0050] 14- Impedance collected by the medial electrode. DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, this should not be understood as limiting the scope of the present invention to the following embodiments, and all technologies implemented based on the present invention fall within the scope of the present invention.

[0052] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or positional relationship, such as "upper", "lower", "left", "right", "center", "inside", and "outside", are based on the expressions of the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the invented product / device / apparatus is placed when it is conventionally used. These terms of orientation or positional relationship are merely for the purpose of facilitating the description of the scheme of the present invention or simplifying the description of the specific embodiments to facilitate the rapid understanding of the scheme by technicians, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship, and therefore should not be understood as limiting the present invention.

[0053] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simply understood that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", and "parallel", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present invention.

[0054] In addition, the expressions “first”, “second”, “third”, etc. in the terms are merely used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0055] In addition, in the description of the embodiments of the present invention, "several," "plurality," and "a number" represent at least two. It can also be any number such as two, three, four, five, six, seven, eight, nine, or even more than nine.

[0056] Furthermore, in the description of the technical solution of the present invention, unless otherwise expressly specified, defined, or limited, the terms "disposed," "installed," "connected," "connected," "provided with," "laid," and "arranged" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welded, riveted, bolted, threaded, or other commonly used connection methods in the art. Such connections may be mechanical, electrical, or communicative; they may be direct, indirect via an intermediate medium, or internally connected between two components.

[0057] In the related art, on the one hand, current point ablation catheters have low ablation efficiency and cannot effectively perform electrophysiological procedures such as pulmonary vein isolation. Furthermore, while circular, basket, and petal electrodes have a large coverage area, they cannot be used to perform surgery on the area where ablation is required. In practice, a new point ablation catheter must be added, which cannot combine the efficiency of multipolar ablation catheters with the advantages of localized fine ablation, increasing ablation procedure time and patient costs. On the other hand, the ablation electrode and mapping electrode are usually two separate catheters, which require frequent switching during surgery, making it difficult to achieve both precise mapping and high-efficiency ablation, increasing the difficulty of the surgical operation and patient costs. Furthermore, to ensure the safety and effectiveness of point ablation, pressure monitoring is often required to ensure good contact between the electrode and the tissue. However, adding this function directly increases the difficulty and cost of catheter manufacturing, which also increases patient surgical costs. Furthermore, no multipolar ablation catheter in the existing art has a single-electrode pressure monitoring function. Pulsed electric field technology, on the other hand, applies a short high voltage to tissue to generate a local high electric field of hundreds of volts per centimeter. This local high electric field damages cell membranes by creating pores in the cell membrane. The electric field applied at the membrane is greater than the cell threshold, so that the pores are not closed. This electroporation is irreversible, thereby allowing biomolecular materials to be exchanged across the membrane, leading to cell necrosis or apoptosis. Pulse irreversible electroporation ablation is different from physical therapies based on the principle of thermal ablation such as radiofrequency, freezing, microwave, and ultrasound. The irreversible electroporation damage to the myocardial membrane by microsecond pulses is a non-thermal biological effect that can effectively avoid damage to blood vessels, nerves, and esophagus. The high-frequency pulsed electric field maintains the non-thermal advantage of irreversible electroporation. The electric field pulse is expected to break through the problem of uneven internal electric field distribution caused by the cell membrane capacitance effect and the anisotropy of biological tissue. When using biphasic pulses, after the previous positive pulse train ends, a negative pulse train with the same pulse width and equal field strength is applied. It is possible that the action potential induced by the positive pulse has not had time to be fully generated. The negative pulse causes the action potential to develop in the opposite direction, which will greatly reduce the stimulation of the electric field to the nerves. For this reason, the technical solution of the present application was produced. The following is combined with Figures 1 to 10 To elaborate.

[0058] Example 1

[0059] like Figures 1 to 10 As shown, the catheter capable of performing local ablation described in the present invention includes a spherical head end 1, a tube body 4, and a control handle 8 connected in sequence.

[0060] like Figure 7 As shown, the spherical head end 1 is connected to the distal end of the tube body 4 , the control handle 8 is connected to the proximal end of the tube body 4 , and the control handle 8 is provided with a Luer connector 9 .

[0061] like Figure 8As shown, the control handle 8 can adjust the bending of the distal end of the tube body 4 so that the spherical head end 1 reaches different positions. This is a conventional technical means in this field and will not be repeated in this embodiment.

[0062] The spherical head end 1 includes a plurality of support arms 2 , a plurality of outer electrodes 5 and a plurality of inner electrodes 7 .

[0063] like Figures 1 to 8 As shown, one end of all the support arms 2 is connected to the distal end of the tube body 4, and the other end intersects and is connected to the extension line of the axis of the tube body 4. The support arms 2 are evenly arranged along the circumference of the tube body 4, and adjacent support arms 2 are staggered and connected, so that a single support arm 2 forms a serpentine structure; the support arms 2 are made of an elastic alloy material, for example, the support arms 2 can be made of a nickel-titanium alloy material.

[0064] like Figure 1 and Figure 2 As shown, a hollow portion 3 is provided between the support arms 2, so that the spherical head end 1 forms a hollow spherical structure, thereby increasing the elasticity of the spherical head end 1, facilitating its contraction into the vascular sheath and then reaching the heart. When the sheath reaches the heart position, it extends out and then returns to a spherical structure for ablation and mapping; the shape of the hollow portion 3 is roughly diamond-shaped or chestnut-shaped.

[0065] like Figure 1 、 Figure 3 and Figure 6 As shown, the outer electrode 5 is provided on the support arm 2. The outer electrode 5 is a flexible planar electrode, and the shape of the flexible planar electrode is one or more of a circle, an ellipse, and a polygon. Among them, those skilled in the art will understand that the shape of the flexible planar electrode is not required to be an absolute circle, an ellipse, or a polygon. As long as the shape is roughly similar to a circle, an ellipse, or a polygon, it should be considered to meet the requirements of the present application. For example, a circle with a small notch, or a straight or curved cut edge, such as a spindle or waisted circle, or an approximate ellipse, such as a triangle or rectangle with rounded corners, or a triangle or rectangle with arc-shaped edges, etc.

[0066] In some optional embodiments, the outer electrodes 5 are provided at the intersecting positions of the adjacent support arms 2 and at the intersection position of all the support arms 2. Figure 1 、 Figure 3 and Figure 6 As shown, the circular flexible planar electrodes are exemplarily provided at the intersection positions of the support arms 2 , and the elliptical flexible planar electrodes are provided at the staggered positions of the support arms 2 .

[0067] In some optional embodiments, the flexible planar electrode is made of gold or platinum, and platinum with a higher melting point may be preferred.

[0068] like Figure 5 As shown, the inner electrode 7 is provided on the support arm 2 and corresponds one-to-one with the outer electrode 5 . The inner electrode 7 is located on the back of the outer electrode 5 , and the surface area of ​​the inner electrode 7 is equal to the surface area of ​​the outer electrode 5 .

[0069] In some optional embodiments, the width of the flexible planar electrode is greater than the width of the support arm 2 .

[0070] In some optional embodiments, the inner electrode 7 is consistent in shape and size with the outer electrode 5 , which facilitates the design and manufacture of the spherical head 1 .

[0071] like Figure 1 As shown, the outer electrodes 5 are arranged in layers from the poles toward the equator of the spherical head 1; the outer electrodes 5 are evenly distributed in each layer; and the outer electrodes 5 in adjacent layers are staggered. With this structural arrangement, the outer electrodes 5 can almost completely cover the surface of the spherical head 1, facilitating that the working surface of the spherical head 1 is evenly distributed with electrodes, enabling omnidirectional operation without requiring excessive adjustments to the position of the tube body 4 to adjust the position of the spherical head 1, especially without requiring excessive rotation of the tube body 4 to adjust the position of the spherical head 1. The axis of the tube body 4 serves as the axis of the spherical head 1, and the equator of the spherical head 1 is perpendicular to the axis of the spherical head 1.

[0072] In some optional embodiments, the number of layers of the outer electrodes 5 is 3 to 5; one outer electrode 5 is set in the first layer; 6 to 10 outer electrodes 5 are set in the remaining layers; and at least one layer is close to the equator or located on the equator.

[0073] As an example, Figure 1 As shown, the outer electrodes 5 are arranged in four layers. The first layer is provided with a circular top outer electrode 51, and the top outer electrode 51 is arranged opposite to the distal end of the tube body 4. The second layer is evenly provided with six elliptical second-layer outer electrodes 52. The third layer is evenly provided with six elliptical third-layer outer electrodes 53, and the third layer is close to or located on the equator. The fourth layer is evenly provided with six elliptical fourth-layer outer electrodes 54. Figure 5As shown, the corresponding inner electrode 7 is also provided with 4 layers, including a top inner electrode 71, a second inner electrode 72, a third inner electrode 73, and a fourth inner electrode 74, wherein the top inner electrode 71 is provided on the back of the top outer electrode 51, the second inner electrode 72 is provided on the back of the second outer electrode 52, the third inner electrode 73 is provided on the back of the third outer electrode 53, and the fourth inner electrode 74 is provided on the back of the fourth outer electrode 54. Figure 1 As shown, the third layer of outer electrodes 53 is arranged on the equator of the spherical head end 1, the top outer electrode 51 and the second layer of outer electrodes 52 are arranged on the upper hemisphere, and the fourth layer of outer electrodes 54 is arranged on the lower hemisphere across the equator.

[0074] In some optional embodiments, such as Figure 4 As shown, the polarities of the outer electrodes 5 of adjacent layers are opposite. This electrode configuration is suitable for bipolar ablation. Figure 4 The example in FIG. 1 illustrates a case where the outer electrodes 5 of the first and third layers are negative electrodes and the outer electrodes 5 of the second and fourth layers are positive electrodes.

[0075] In some optional embodiments, such as Figure 9 As shown, each of the outer electrodes 5 discharges relative to the neutral electrode 12 . This electrode configuration is suitable for monopolar ablation. The neutral electrode 12 is set on the human body 10 .

[0076] like Figure 1 、 Figure 2 and Figure 6 As shown, the distal end of the tube body 4 is provided with an infusion tube 6, which extends into the spherical head end 1. With this structural arrangement, heparinized saline can be continuously infused into the spherical head end 1 through the infusion tube 6 during surgery to perform anticoagulation treatment and avoid thrombosis.

[0077] As an example, Figure 1 As shown, the perfusion tube 6 at the intersection of the distal end of the tube body 4 and the spherical head end 1 is provided with a plurality of proximal perfusion channels 61, the top of the perfusion tube 6 is provided with a plurality of apical perfusion channels 63, and the perfusion tube 6 between the proximal perfusion channels 61 and the apical perfusion channels 63 is provided with a plurality of distal perfusion channels 62, and the proximal perfusion channels 61, the distal perfusion channels 62, and the apical perfusion channels 63 are all evenly arranged along the circumference of the perfusion tube 6; the intersection of the distal end of the tube body 4 and the spherical head end 1 is a location where thrombus is prone to occur, and heparin saline can be continuously infused there through the proximal perfusion channel 61 for anticoagulation treatment.

[0078] In some optional embodiments, the proximal perfusion channel 61 and the distal perfusion channel 62 are both opened along the radial direction of the perfusion tube 6. The distal perfusion channel 62 infuses heparinized saline into the center of the spherical tip 1. The top perfusion channel 63 is opened along the axial direction of the perfusion tube 6. The top perfusion channel 63 can infuse heparinized saline into the end of the spherical tip 1 away from the tube body 4. This design can cover the entire spherical tip 1 with anticoagulant heparinized saline to prevent blood clotting.

[0079] In some optional embodiments, the outer diameter of the perfusion tube 6 is smaller than the inner diameter of the tube body 4 , and the support arm 2 is evenly wrapped around the perfusion tube 6 .

[0080] like Figure 1 、 Figure 5 、 Figure 9 and Figure 10 As shown, at least one reference electrode 11 is set on the human body 10, and the outer electrode 5 collects real-time impedance data relative to the reference electrode 11, that is, the impedance 13 collected by the outer electrode, and the inner electrode 7 collects real-time impedance data relative to the reference electrode 11, that is, the impedance 14 collected by the inner electrode. The impedance in the blood of the human body 10 is basically constant, that is, the impedance 14 collected by the inner electrode is basically constant, and the impedance 13 collected by the outer electrode varies with the degree of contact with the human tissue; when the outer electrode 5 is not in contact with the human tissue, the impedance collected by the outer electrode 5 is the blood impedance, that is, at this time the outer electrode 5 The impedance 13 collected by the electrode is consistent with the impedance 14 collected by the inner electrode. When the outer electrode 5 is in contact with human tissue, the impedance collected by the outer electrode 5 is the myocardial tissue impedance, which is greater than the blood impedance. That is, at this time, the impedance 13 collected by the outer electrode is greater than the impedance 14 collected by the inner electrode. Therefore, by comparing the impedance 13 collected by the outer electrode with the impedance 14 collected by the inner electrode in real time, it is possible to clearly determine whether the outer electrode 5 is in contact with human tissue or blood. Since effective ablation requires good contact between the electrode and human tissue, it can better feedback the contact status of human tissue and improve the effectiveness of ablation. Since each outer electrode 5 is paired with the inner electrode 7, located in almost the same spatial position, and independently set up for detection, it is possible to accurately determine whether each outer electrode 5 is in contact.

[0081] The catheter capable of performing local ablation described in this embodiment can achieve multipolar ablation and mapping by providing the spherical head end 1 and the plurality of outer electrodes 5 thereon. By providing the outer electrodes 5 as flexible planar electrodes, local tissue ablation within the plane range can be achieved, that is, the same catheter can simultaneously achieve multipolar precision mapping, multipolar high-efficiency ablation, and single-point local fine ablation. There is no need to replace the catheter during use, which improves efficiency and reduces overall costs.

[0082] The catheter capable of performing local ablation described in this embodiment is configured with the hollow portion 3 and the elastic support arm 2 so that the spherical head end 1 can be deformed and restored, thereby facilitating entry and exit of the sheath.

[0083] The catheter described in this embodiment is capable of performing local ablation. The hollow portion 3 is provided to make the spherical head end 1 hollow, so that blood can enter the interior of the spherical head end 1, and the inner electrode 7 can be in contact with the blood. The surface area of ​​the inner electrode 7 is equal to the surface area of ​​the outer electrode 5, and can have the same reference standard. The impedance detection and comparison of each pair of the outer electrode 5 and the inner electrode 7 can confirm the degree of contact of the outer electrode 5. Even in the case of multiple ablation electrodes, the contact detection of any single outer electrode 5 can be achieved, which overcomes the problem in the prior art that multi-polar ablation catheters are difficult to implement to determine the degree of contact of a single electrode through pressure monitoring. It has good practicality, does not require the integration of a pressure sensor on the electrode, and greatly simplifies the design difficulty of the spherical head end 1.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A catheter capable of performing local ablation, comprising a spherical head (1) and a tube body (4), wherein the spherical head (1) is connected to the distal end of the tube body (4), and is characterized in that: The spherical head end (1) comprises a plurality of support arms (2), a plurality of outer electrodes (5) and a plurality of inner electrodes (7); A hollow portion (3) is provided between the support arms (2), and the support arms (2) are elastic; The outer electrode (5) is provided on the support arm (2), the outer electrode (5) is a flexible planar electrode, the shape of the flexible planar electrode is one or more of a circle, an ellipse, and a polygon, and the width of the flexible planar electrode is greater than the width of the support arm (2); The inner electrode (7) is provided on the support arm (2) and corresponds one-to-one with the outer electrode (5); the inner electrode (7) is located on the back side of the outer electrode (5); and the surface area of ​​the inner electrode (7) is equal to the surface area of ​​the outer electrode (5); The outer electrodes (5) are arranged in layers from the poles of the spherical head end (1) to the equator, the outer electrodes (5) of each layer are evenly arranged, and the outer electrodes (5) of adjacent layers are staggered; The outer electrodes (5) of adjacent layers have opposite polarities for bipolar ablation; Alternatively, each of the outer electrodes (5) discharges relative to a neutral electrode (12) for monopolar ablation, and the neutral electrode (12) is arranged on a human body (10); At least one reference electrode (11) is provided on a human body (10); the outer electrode (5) collects an impedance (13) collected by the outer electrode in real time relative to the reference electrode (11); the inner electrode (7) collects an impedance (14) collected by the inner electrode in real time relative to the reference electrode (11); and the impedance (13) collected by the outer electrode and the impedance (14) collected by the inner electrode are compared in real time.

2. The catheter capable of performing local ablation according to claim 1, characterized in that: The inner electrode (7) is consistent in shape and size with the outer electrode (5).

3. The catheter capable of local ablation according to claim 1, characterized in that: The number of layers of the outer electrodes (5) is 3 to 5; The first layer is provided with an outer electrode (5); The remaining layers are provided with 6 to 10 outer electrodes (5); At least one layer is near or on the equator.

4. The catheter capable of local ablation according to claim 3, characterized in that: The number of layers of the outer electrodes (5) is 4; The first layer is provided with a top outer electrode (51), and the top outer electrode (51) is arranged opposite to the distal end of the tube body (4); The second layer is provided with 6 second layer outer electrodes (52); The third layer is provided with six third layer outer electrodes (53), and the third layer is close to the equator or located on the equator; The fourth layer is provided with six fourth-layer outer electrodes (54).

5. The catheter capable of performing local ablation according to claim 1, characterized in that: The distal end of the tube body (4) is provided with an irrigation tube (6), and the irrigation tube (6) extends into the spherical head end (1).

6. The catheter capable of performing local ablation according to claim 5, characterized in that: The perfusion tube (6) is provided with a plurality of proximal perfusion channels (61) at the intersection of the distal end of the tube body (4) and the spherical head end (1); The top of the perfusion tube (6) is provided with a plurality of top perfusion channels (63); A plurality of distal perfusion channels (62) are provided on the perfusion tube (6) between the proximal perfusion channel (61) and the top perfusion channel (63).

7. The catheter capable of performing local ablation according to claim 1, characterized in that: Adjacent support arms (2) are staggered and connected, and converge on an extension line of the axis of the tube body (4).

8. The catheter capable of performing local ablation according to any one of claims 1 to 7, characterized in that: The proximal end of the tube body (4) is connected to a control handle (8), and the control handle (8) is provided with a Luer connector (9).

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