Method and device for determining ablation effect of ablation system, and ablation system

Abstract

A method and device for determining an ablation effect of an ablation system, and an ablation system. The ablation system comprises a spherical catheter, a return electrode, and an energy release device. The spherical catheter comprises a catheter and a spherical tip disposed on the catheter, wherein a plurality of electrodes are provided on the spherical tip. Firstly, a current overall loop impedance value from the plurality of electrodes through a human body to the return electrode are acquired, effective ablation power is calculated on the basis of the current overall loop impedance value, and then an ablation effect is determined on the basis of the effective ablation power. In this way, effective power delivered to human tissues can be accurately calculated, thereby accurately evaluating the ablation effect.

Description

Methods, devices, and ablation systems for evaluating the ablation effect

[0001] Cross-references to related applications

[0002] This application claims priority to patent application No. CN202411812538.2, filed on December 10, 2024, entitled “Method, Apparatus and Ablation System for Judging the Ablation Effect of Ablation System”, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This application relates to the field of cardiovascular interventional technology, and in particular to a method, apparatus, and an ablation system for judging the ablation effect of an ablation system. Background Technology

[0004] Catheter ablation is a common treatment for arrhythmias, where energy is introduced into the heart through a catheter to ablate specific areas of myocardial cells and eliminate lesions. In early clinical catheter ablation procedures, the process included: first, determining the puncture point; then, puncturing a vein / artery at the predetermined site to establish a catheter pathway from the puncture point to the heart chamber for electrophysiological monitoring; recording the electrophysiological activity of different parts of the heart; inducing arrhythmias through appropriate electrical stimulation; analyzing abnormal electrical waves to accurately locate the lesion; then, accurately delivering the ablation catheter electrode to the lesion site, delivering energy for ablation, blocking the abnormal electrical wave conduction pathway, and thus curing the arrhythmia; after ablation, intracardiac electrophysiological monitoring was performed. If the heart rhythm was normal, the procedure was considered complete; if an abnormal heart rhythm still existed, it indicated incomplete ablation, requiring repeat ablation treatment. Obviously, such ablation catheters do not have quantitative data to show the current ablation depth and size for the surgeon to refer to. The surgeon can only rely on surgical experience and the ability to manipulate the catheter to predict the current ablation depth. The surgery is very difficult and the requirements for the surgeon are also very high.

[0005] Therefore, there is a need for a method that can predict ablation damage. Summary of the Invention

[0006] This application provides a method for determining the ablation effect of an ablation system. The ablation system includes a spherical catheter, a back electrode plate, and an energy release device. The spherical catheter includes a conduit and a spherical tip disposed on the conduit. Multiple electrodes are arranged on the spherical tip, which is attached to the human tissue to be ablated. The back electrode plate is attached to the surface of the human skin. The energy release device is connected to both the spherical catheter and the back electrode plate, and is used to provide ablation energy to the electrodes on the spherical catheter. The method includes:

[0007] Obtain the current overall loop impedance value from the plurality of electrodes through the human body to the back electrode plate;

[0008] Calculate the effective ablation power based on the current overall circuit impedance value; and

[0009] The ablation effect is determined based on the effective ablation power.

[0010] Furthermore, calculating the effective ablation power based on the current overall circuit impedance value includes:

[0011] The effective ablation power is calculated using the following formula:

[0012] Among them, P y The effective ablation power is P, the total ablation power released to the plurality of electrodes is P, and the current overall circuit impedance value is R. a R is the first overall circuit impedance value of the plurality of electrodes through the human body to the back electrode plate when the spherical tip is completely immersed in human blood. b The second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue.

[0013] Furthermore, the method also includes:

[0014] Determine the current contact state between the spherical tip and the human tissue; and

[0015] The ablation effect is determined based on the adhesion state.

[0016] Further, determining the contact state includes:

[0017] Obtain the current impedance value of each electrode through the human body to the back electrode plate;

[0018] The state of each electrode is determined based on the current impedance value from the human body to the back electrode plate. This state includes a first state where the electrode is in the human bloodstream and a second state where the electrode is in contact with human tissue. Specifically, when the current impedance value is on the first order of magnitude, the electrode corresponding to that impedance value is determined to be in the first state; and when the current impedance value is on the second order of magnitude, the electrode corresponding to that impedance value is determined to be in the second state.

[0019] The contact state is determined based on the state of each electrode.

[0020] Furthermore, determining the contact state also includes:

[0021] Obtain the current impedance value between any two adjacent electrodes on the spherical end. When the current impedance value between any two adjacent electrodes is within... When the two adjacent electrodes are in good contact with the human tissue, it indicates that the two adjacent electrodes are in good contact with the human tissue.

[0022] Where S is the surface area of ​​the spherical head end, S'' is the surface area occupied by any two adjacent electrodes, and R b x is the second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue, and x is the allowable error value.

[0023] Furthermore, the method also includes:

[0024] The maximum permissible ablation power is determined using the following formula:

[0025] Among them, P max The maximum permissible ablation power is denoted by α, where α is the maximum safe power density of the energy release device, S is the surface area of ​​the spherical tip, and R is the maximum permissible ablation power. b The second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue.

[0026] Furthermore, the method further includes: adjusting the position of the spherical tip and / or providing recommended power parameters based on the effective ablation power and / or the contact state and / or the currently allowed maximum ablation power.

[0027] Furthermore, the ablation effect includes ablation depth and ablation damage.

[0028] This application also provides an apparatus for determining the ablation effect of an ablation system, including a memory and a processor coupled to the memory, the processor being configured to execute the steps of the method for determining the ablation effect of the ablation system described above based on instructions stored in the memory.

[0029] This application also provides an ablation system, comprising:

[0030] A spherical catheter includes a catheter and a spherical tip disposed on the catheter, wherein multiple electrodes are arranged on the spherical tip, and the spherical tip is attached to the human tissue to be ablated.

[0031] The backplate is attached to the surface of human skin;

[0032] An energy release device is connected to the spherical conduit and the back electrode plate respectively, and is used to provide ablation energy to the electrodes on the spherical conduit;

[0033] An impedance monitoring module is used to acquire the current overall loop impedance value from the plurality of electrodes through the human body to the back electrode plate;

[0034] The ablation damage assessment module is used to calculate the effective ablation power based on the current overall circuit impedance value, and to judge the ablation effect based on the effective ablation power.

[0035] The method, apparatus, and ablation system for determining the ablation effect according to embodiments of this application first obtain the current overall circuit impedance value of multiple electrodes through the human body to the back electrode plate, calculate the effective ablation power based on the current overall circuit impedance value, and then determine the ablation effect based on the effective ablation power. In this way, the effective power acting on human tissue can be accurately calculated, thereby accurately evaluating the ablation effect. Attached Figure Description

[0036] The accompanying drawings, which are part of the specification of this application, illustrate embodiments of the present application and are used together with the description of the specification to illustrate the principles of the present application.

[0037] Figure 1 shows a schematic diagram of an ablation system according to an embodiment of this application.

[0038] Figure 2 shows a flowchart of a method for determining the ablation effect of an ablation system according to an embodiment of this application.

[0039] Figure 3 shows a schematic diagram of the loop formed by a single electrode in impedance monitoring according to an embodiment of this application.

[0040] Figure 4 shows a schematic diagram of the circuit formed by two electrodes in impedance monitoring according to an embodiment of this application. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the spirit of the content disclosed in this application will be clearly explained below with reference to the accompanying drawings and detailed description. After understanding the embodiments of this application, any person skilled in the art can make changes and modifications based on the technology taught in this application without departing from the spirit and scope of this application.

[0042] The illustrative embodiments and descriptions provided in this application are for explaining the application, but are not intended to limit the application. Furthermore, elements / components using the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0043] The terms “first,” “second,” etc., used in this document are not intended to specifically refer to order or sequence, nor are they used to limit this application; they are merely used to distinguish elements or operations described using the same technical terms.

[0044] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0045] The term "and / or" as used herein includes any or all of the things mentioned.

[0046] The term "multiple" in this article includes "two" and "more than two"; the term "multiple groups" in this article includes "two groups" and "more than two groups".

[0047] Certain terms used to describe this application will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the application.

[0048] This application provides an ablation system. As shown in Figure 1, the ablation system of this application includes a spherical catheter 11, a back electrode plate 12, an energy release device 13, an impedance monitoring module 14, and an ablation damage assessment module 15. The spherical catheter 11 includes a catheter and a spherical tip 1 disposed on the catheter. Multiple electrodes are arranged on the spherical tip. The spherical tip is attached to the human tissue to be ablated. The back electrode plate 12 is attached to the surface of the human skin, preferably to the surface of the skin on the back of the human body. The energy release device 13 is connected to the spherical catheter and the back electrode plate respectively, and is used to provide ablation energy to the electrodes on the spherical catheter. The impedance monitoring module 14 is used to obtain the current overall circuit impedance value from the multiple electrodes through the human body to the back electrode plate. The ablation damage assessment module 15 is used to calculate the effective ablation power based on the current overall circuit impedance value, and to judge the ablation effect based on the effective ablation power.

[0049] Specifically, during use, the bulbous tip of the spherical catheter is first inserted into the patient's myocardium through a blood vessel, ensuring close contact with the myocardial tissue to be ablated. Once the bulbous tip is in the appropriate position, ablation energy is released to the electrodes on the bulbous tip via an energy release device. At this point, the energy release device, the electrodes, the human body between the electrodes and the back electrode plate, and the back electrode plate form a complete circuit. Furthermore, because there are multiple electrodes on the bulbous tip, each electrode also forms multiple separate circuits with the energy release device, the back electrode plate, and the human body.

[0050] In the above process, the ablation effect varies depending on the location of the spherical tip. For example, a portion of the spherical tip's surface area may be in close contact with the tissue to be ablated, while another portion may be immersed in blood, leading to different ablation effects. Ideally, the surface area of ​​the spherical tip in contact with the tissue to be ablated should be as large as possible, and this contact area should be as continuous as possible to achieve a better ablation effect. However, existing technologies cannot predict the ablation effect before releasing ablation energy to the electrodes. In this embodiment, the ablation effect is predicted by monitoring the contact impedance between multiple electrodes on the spherical tip and the myocardial tissue. Furthermore, the position of the spherical tip can be readjusted or ablation can be performed directly based on the predicted ablation effect, thereby achieving precise ablation.

[0051] In the ablation system of Figure 1, multiple electrodes are distributed on the spherical tip 1 of the spherical catheter 11. These electrodes can be uniformly or non-uniformly arranged on the spherical tip 1. The spherical tip can be a non-compliant balloon. These electrodes can be identical. The electrodes can cover the entire surface of the spherical tip. Each electrode is connected to an energy release device 13.

[0052] The energy release device 13 is connected to the ablation catheter 11 and the back electrode plate 12. The back electrode plate 12 is attached to the surface of the human skin, forming an ablation circuit between the ablation catheter and the human body. The energy release device can have power setting and display. For example, the energy release device can be a radiofrequency ablation device that releases radiofrequency energy to the electrodes to ablate myocardial tissue.

[0053] Impedance monitoring module 14 is installed between the interfaces of the energy release device and the multiple electrodes, and between the energy release device and the back electrode plate, to acquire the current overall circuit impedance value from the multiple electrodes through the human body to the back electrode plate. Ablation damage assessment module 15 calculates the effective ablation power based on the current overall circuit impedance value and judges the ablation effect based on the effective ablation power.

[0054] This allows for accurate calculation of the effective power applied to human tissue, thus enabling accurate assessment of the ablation effect.

[0055] Figure 2 illustrates a method for determining the ablation effect of an ablation system according to an embodiment of this application. This method is used before ablation is performed using the ablation system to predict the ablation effect. The method includes the following steps S21-S23.

[0056] S21, obtain the current overall loop impedance value from multiple electrodes through the human body to the back plate.

[0057] As described above, in the ablation system, the energy release device, electrodes, the human body between the electrodes and the back electrode plate, and the back electrode plate form a complete circuit. Once the spherical tip is in place, the current overall circuit impedance value can be obtained. The energy release device is connected to multiple electrodes and the back electrode plate; this current overall circuit impedance value refers to the impedance value between the two interfaces of the energy release device. When the energy release device is a radiofrequency ablation unit (RFA), the RFA will display this current overall circuit impedance value, which the impedance monitoring module can directly obtain from the RFA. Different placement positions of the spherical tip correspond to different current overall circuit impedance values.

[0058] S22, calculate the effective ablation power based on the current overall circuit impedance value.

[0059] In this embodiment, it is assumed that: the surface area of ​​the spherical tip is S, and the first overall loop impedance between the two interfaces of the energy release device is R when the spherical tip is completely in the blood and not close to the tissue. a When the spherical tip is completely wrapped by human tissue, the impedance value of the second integral circuit between the two interfaces of the energy release device is R. b S can be measured in advance, and R... a and R b This can be obtained in advance through experimentation. For example, for obtaining R... a The spherical tip can be completely immersed in blood, and then the impedance values ​​of multiple electrodes on the spherical tip through the human body to the back electrode plate can be measured. The measurement and calculation errors between different individuals are small, so the differences between individuals can be ignored.

[0060] When the spherical tip is properly attached, part of the electrode is immersed in blood. The impedance of current conduction through the blood is denoted as R. x The surface area of ​​this part of the electrode is denoted as S. x The current in this area dissipates through the blood; simultaneously, a portion of the electrode is in contact with human tissue, and the impedance of the current conduction through the human tissue is denoted as R. y The surface area of ​​this part of the electrode is denoted as S. y The current in this area all passes through the target tissue; at this time, the overall loop impedance is denoted as R, the output power of the energy release device is denoted as P, the effective power proportionality coefficient is denoted as β, and the effective ablation power is denoted as Pa. y .

[0061] Therefore, the following derivation can be made:

[0062] Total electrode area S = S x +S y If the effective ablation power and the electrode area emitting the effective ablation power both follow the same ratio, then P... y =P×β,S y =S×β, S x =S×(1-β).

[0063] Resistance is inversely proportional to area. Therefore, we can conclude that:

[0064] According to the resistance calculation formula for parallel circuits: It can be concluded that

[0065] Then effective power

[0066] Therefore, as derived above, in this step, the formula can be used. To calculate the effective ablation power.

[0067] S23, determine the ablation effect based on the effective ablation power.

[0068] The ablation effect can be evaluated by the effective ablation power. Under the same output power, the higher the effective ablation power, the better the ablation effect.

[0069] As shown above, the effective power applied to human tissue can be accurately calculated, thereby accurately assessing the ablation effect.

[0070] In another embodiment of this application, the ablation effect is not only determined based on the effective ablation power, but also based on the adhesion state between the spherical tip and the human tissue. Here, the adhesion state refers to whether the electrodes adhering to the human tissue are multiple electrodes attached together or dispersedly.

[0071] In one embodiment, the impedance monitoring module 14 also acquires the current impedance value of each electrode through the human body to the back electrode plate. Because multiple separate circuits are formed between each electrode and the energy release device, the back electrode plate, and the human body, the current impedance value of each electrode through the human body to the back electrode plate can also be acquired, that is, the impedance value between the interface between the energy release device and each electrode and the interface between the energy release device and the back electrode plate, so as to determine the state of the electrode based on the current impedance value of each individual electrode.

[0072] Specifically, as shown in Figure 3, the impedance monitoring module 14 monitors the current impedance value of a single electrode as it travels through the body to the back electrode plate. This current impedance value differs by orders of magnitude when the electrode is in the blood and when it is in contact with myocardial tissue. The impedance increases significantly when the electrode is in contact with myocardial tissue. Therefore, the contact state can be determined based on the state of each electrode. When the impedance value is on the first order of magnitude, the electrode corresponding to that impedance value is determined to be in a first state; when the impedance value is on the second order of magnitude, the electrode corresponding to that impedance value is determined to be in a second state. Under ideal contact conditions, the first order of magnitude is smaller than the second order of magnitude. This allows determination of whether a single electrode is in contact with blood or myocardial tissue. Since the position of each electrode on the spherical tip is fixed, it is possible to determine whether the electrodes in contact with myocardial tissue are in patchy or dispersed contact, thereby assessing the ablation effect. When multiple adjacent electrodes are in patchy contact with myocardial tissue, the ablation effect is better.

[0073] In one embodiment, a multiconductor can be used to perform a single impedance measurement. The multiconductor can measure 128 or 256 signals, each corresponding to a different electrode.

[0074] In another embodiment, the impedance monitoring module 14 also acquires the current impedance value between any two adjacent electrodes on the spherical tip. That is, the contact impedance between each pair of adjacent electrodes and blood and / or tissue can be obtained by the impedance monitoring module. When the current impedance value between any two adjacent electrodes is within... When the two adjacent electrodes are in good contact with the human tissue, it indicates that S is the surface area of ​​the spherical tip, S'' is the surface area occupied by any two adjacent electrodes, and R b x is the second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue, and x is the allowable error value.

[0075] Specifically, as shown in Figure 4, taking one electrode pair as an example, the surface area occupied by the electrode pair is known, denoted by S''. The total surface area of ​​the spherical head is known as S. b This is the second overall loop impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical tip is completely wrapped by human tissue. There is a relationship between them: impedance is inversely proportional to surface area. Therefore, under ideal contact conditions, the impedance between this electrode pair should satisfy: In this system, the electrode pairs are connected in parallel, so the larger the combined surface area, the smaller the impedance. Therefore, the smaller the impedance, the better the ablation effect.

[0076] In summary, the ablation effect can be judged based on both the effective ablation power and the contact status, including the advance assessment of ablation depth and ablation damage. When the predicted ablation effect is not as expected, the position of the bulbous tip in the myocardium can be readjusted until the expected ablation effect is achieved. When the predicted ablation effect meets expectations, subsequent ablation procedures can be performed directly.

[0077] In this way, not only can the effective power applied to human tissue be accurately calculated, but also the distribution of the effective power on human tissue can be obtained, thereby enabling a more accurate assessment of the ablation depth and ablation effect.

[0078] In one embodiment, the bulbous tip of the ablation catheter is also uniformly distributed with multiple micropores, through which isobaric saline infusion can be performed. Saline infusion can reduce contact resistance. Therefore, when ablation is performed using saline infusion, the aforementioned resistance refers to the resistance under saline infusion conditions.

[0079] In another embodiment of this application, the maximum ablation power currently allowed can also be determined.

[0080] Specifically, to avoid thrombosis, scab formation, and rupture caused by ablation, the output power of the energy release device needs to be correctly set. The surface area of ​​the spherical tip in contact with human tissue is a key factor determining the maximum safe and effective power; the larger the surface area of ​​the human tissue in contact, the higher the maximum safe and effective power that can be output. The maximum safe power is calculated as: maximum safe power = contact surface area × maximum safe power density, where the maximum safe power density 'a' can be obtained experimentally.

[0081] If P at this time y It has already approached the maximum safe power limit, according to the power formula. U can be derived 2 =a×S y ×R y =a×S×R b The output power formula is set. Therefore, the safe upper limit of power allowed by the energy release device

[0082] Therefore, the maximum permissible ablation power is determined by the following formula:

[0083] In summary, the ablation effect can also be judged by combining the current maximum allowed ablation power.

[0084] The above describes a method for judging the ablation effect of an ablation system according to embodiments of this application. Through the above method, the effective ablation power, contact state, and maximum safe power can be obtained, and the ablation depth and ablation damage can be evaluated, thereby enabling an accurate evaluation of the ablation effect.

[0085] This application also provides an apparatus for determining the ablation effect of an ablation system, including a memory and a processor coupled to the memory, the processor being configured to execute the steps of the method for determining the ablation effect of an ablation system described above based on instructions stored in the memory.

[0086] This application also provides an ablation system, comprising:

[0087] The spherical catheter 11 includes a catheter and a spherical tip disposed on the catheter, wherein a plurality of electrodes are arranged on the spherical tip and the spherical tip is attached to the human tissue to be ablated.

[0088] The back electrode plate 12 is attached to the surface of human skin;

[0089] The energy release device 13 is connected to the spherical conduit and the back electrode plate respectively, and is used to provide ablation energy to the electrodes on the spherical conduit;

[0090] Impedance monitoring module 14 is used to acquire the current overall loop impedance value from the plurality of electrodes through the human body to the back electrode plate; and

[0091] The ablation damage assessment module 15 is used to calculate the effective ablation power based on the current overall circuit impedance value, and to judge the ablation effect based on the effective ablation power.

[0092] In addition, the impedance monitoring module 14 and the ablation damage assessment module 15 can also perform the steps in other embodiments of the method for determining the ablation effect of the ablation system described above.

[0093] According to the method, apparatus and ablation system for judging the ablation effect of the ablation system according to the embodiments of this application, the effective ablation power, contact state and maximum safe limit power can be obtained, and the ablation depth and ablation damage can be evaluated, thereby enabling accurate evaluation of the ablation effect.

[0094] The above description is merely an illustrative embodiment of this application. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this application shall fall within the scope of protection of this application.

Claims

1. A method for determining the ablation effect of an ablation system, the ablation system comprising a spherical catheter, a back electrode plate, and an energy release device, the spherical catheter comprising a conduit and a spherical tip disposed on the conduit, the spherical tip being disposed of multiple electrodes, the spherical tip being in contact with the human tissue to be ablated, the back electrode plate being in contact with the surface of human skin, and the energy release device being connected to the spherical catheter and the back electrode plate respectively, for providing ablation energy to the electrodes on the spherical catheter, the method comprising: Obtain the current overall loop impedance value from the plurality of electrodes through the human body to the back electrode plate; Calculate the effective ablation power based on the current overall circuit impedance value; as well as The ablation effect is determined based on the effective ablation power.

2. The method according to claim 1, characterized in that, The effective ablation power is calculated based on the current overall circuit impedance value, including: The effective ablation power is calculated using the following formula: Among them, P y The effective ablation power is P, the total ablation power released to the plurality of electrodes is P, and the current overall circuit impedance value is R. a R is the first overall circuit impedance value of the plurality of electrodes through the human body to the back electrode plate when the spherical tip is completely immersed in human blood. b The second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue.

3. The method according to claim 1, characterized in that, The method further includes: Determine the current contact state between the spherical tip and the human tissue; and The ablation effect is determined based on the adhesion state.

4. The method according to claim 3, characterized in that, Determining the contact state includes: Obtain the current impedance value of each electrode through the human body to the back electrode plate; The state of each electrode is determined based on the current impedance value from the human body to the back electrode plate. This state includes a first state where the electrode is in the human bloodstream and a second state where the electrode is in contact with human tissue. Specifically, when the current impedance value is on the first order of magnitude, the electrode corresponding to that impedance value is determined to be in the first state; and when the current impedance value is on the second order of magnitude, the electrode corresponding to that impedance value is determined to be in the second state. The contact state is determined based on the state of each electrode.

5. The method according to claim 3, characterized in that, Determining the contact state also includes: Obtain the current impedance value between any two adjacent electrodes on the spherical end. When the current impedance value between any two adjacent electrodes is within... When the two adjacent electrodes are in good contact with the human tissue, it indicates that the two adjacent electrodes are in good contact with the human tissue. Where S is the surface area of ​​the spherical head end, S'' is the surface area occupied by any two adjacent electrodes, and R b x is the second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue, and x is the allowable error value.

6. The method according to claim 3, characterized in that, The method further includes: The maximum permissible ablation power is determined using the following formula: Among them, P max The maximum permissible ablation power is denoted by α, where α is the maximum safe power density of the energy release device, S is the surface area of ​​the spherical tip, and R is the maximum permissible ablation power. b The second overall circuit impedance value of the multiple electrodes through the human body to the back electrode plate when the spherical head end is completely wrapped by human tissue.

7. The method according to claim 6, characterized in that, Also includes: The position of the spherical tip is adjusted and / or recommended power parameters are provided based on the effective ablation power and / or the contact state and / or the currently allowed maximum ablation power.

8. The method according to claim 1, characterized in that, The ablation effect includes ablation depth and ablation damage.

9. A device for judging the ablation effect of an ablation system, characterized in that, The method includes a memory and a processor coupled to the memory, the processor being configured to perform the steps of the method as described in any one of claims 1-8 based on instructions stored in the memory.

10. An ablation system, comprising: A spherical catheter includes a catheter and a spherical tip disposed on the catheter, wherein multiple electrodes are arranged on the spherical tip, and the spherical tip is attached to the human tissue to be ablated. The backplate is attached to the surface of human skin; An energy release device is connected to the spherical conduit and the back electrode plate respectively, and is used to provide ablation energy to the electrodes on the spherical conduit; An impedance monitoring module is used to acquire the current overall loop impedance value from the plurality of electrodes through the human body to the back electrode plate; The ablation damage assessment module is used to calculate the effective ablation power based on the current overall circuit impedance value, and to judge the ablation effect based on the effective ablation power.

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