A method and device for preventing arcing during pulse ablation

Abstract

The present invention belongs to the technical field of medical devices. The present invention provides a method for preventing arcs during pulse ablation, including: obtaining distance information, current information, voltage information, user setting information and weight information of each electrode in a catheter; judging whether adjacent electrodes exceed an acceptable distance based on the distance information, current information, voltage information, user setting information and weight information; issuing a warning prompt when adjacent electrodes are below the acceptable distance; and issuing an ablation prompt when adjacent electrodes exceed the acceptable distance. The present invention can notify the user of an application when two or more electrodes are close to each other, solving the problem of possible voltage arcs.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a method and a device for preventing electric arcs from occurring during pulse ablation. Background Art

[0002] In the clinical application of modern medicine, pulsed field ablation (PFA) can be used to treat diseases such as uncontrolled cell proliferation or tumors and arrhythmias caused by ectopic pacemakers in the heart.

[0003] During pulsed field ablation, when the catheter is in the heart chamber, a large voltage potential is generated between two or more electrodes, such as Figure 2 As shown. The large voltage potential results in a strong electric field. In addition, another catheter may be close to the electrode with a high voltage potential and used as a pathway for the ablative energy, such as Figure 3 shown.

[0004] Due to the structure of the ablation electrode, the electric field density becomes non-uniform and the density at different locations should be higher than that at other locations. Figure 4 As shown, Bardy et al. (Circular Research, Vol. 63, August 1988) show the field strength at the tip electrode compared to a specially designed electrode. It can be seen that the field at the interface of the metal to the catheter shaft is much more dense. This high density field can cause arcing or sparking. Jackman et al. (CIRCEP.114.002255.pdf) have described the disadvantages of sparking inside the heart, which should therefore be avoided.

[0005] However, the existing technology is temporarily unable to detect the arc generated in the pulse discharge. Summary of the invention

[0006] The present invention provides a method and device for preventing arc from occurring during pulse ablation, thereby overcoming the above problems.

[0007] The technical solution provided by the present invention is as follows:

[0008] In one aspect, the present invention provides a method for preventing arcing during pulse ablation, comprising:

[0009] Obtaining distance information, current information, user setting information and weight information of each electrode in the catheter;

[0010] Based on the distance information, the current information, the user setting information and the weight information, determining whether the adjacent electrodes exceed an acceptable distance;

[0011] When the distance between adjacent electrodes is below the acceptable level, a warning will be given;

[0012] When the adjacent electrodes do not exceed the acceptable distance, ablation prompt is performed.

[0013] In some embodiments, obtaining distance information of each electrode in the catheter includes:

[0014] The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and / or magnetic positioning mode, or a combination of the two positioning modes.

[0015] In some embodiments, the electrical positioning mode includes: mapping the current information, voltage information or magnetic field information measured according to the electric field and / or magnetic field environment established outside the body received by the catheter into three-dimensional coordinate information to calculate the position information of each electrode.

[0016] In some embodiments, obtaining current information of each electrode in the catheter includes:

[0017] According to the predefined current activation sequence, the current information received by each electrode is determined.

[0018] In some embodiments, judging whether adjacent electrodes exceed an acceptable distance based on the current information includes:

[0019] Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold Imax of the preset acceptable distance is exceeded.

[0020] A device for preventing arcing during pulse ablation, comprising:

[0021] An acquisition module, used to acquire distance information, current information, user setting information and weight information of each electrode in the catheter;

[0022] A judgment module, used to judge whether adjacent electrodes exceed an acceptable distance based on the distance information, current information, user setting information and weight information;

[0023] A warning module is used to issue a warning prompt when the adjacent electrodes are below an acceptable distance;

[0024] The ablation module is used to provide ablation prompts when the adjacent electrodes do not exceed an acceptable distance.

[0025] In some embodiments, the acquisition module is used to:

[0026] The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and / or magnetic positioning mode, or a combination of the two positioning modes.

[0027] In some embodiments, the acquisition module is used to: map the current information, voltage information or magnetic field information measured according to the electric field and / or magnetic field environment established outside the body received by the catheter into three-dimensional coordinate information to calculate the position information of each electrode.

[0028] In some embodiments, the acquisition module is used to:

[0029] According to the predefined current activation sequence, the current information received by each electrode is determined.

[0030] In some embodiments, the determination module is used to:

[0031] Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold I of the preset acceptable distance is exceeded max .

[0032] The method and device for preventing arcing during pulse ablation provided by the present invention have at least one of the following beneficial effects: the present invention can notify the user when two or more electrodes are close to each other, solving the problem of possible voltage arcing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0034] Figure 1 is a schematic diagram of an embodiment of a method for preventing arcing during pulse ablation of the present invention;

[0035] Figure 2 is a schematic diagram of the catheter electrodes in proximity;

[0036] Figure 3 is a schematic diagram of the proximity of the circular and focal ducts;

[0037] Figure 4 This is a schematic diagram of the electric field strength on the catheter electrode provided by Bardy et al 1988;

[0038] Figure 5 is a schematic diagram of an embodiment of a method for preventing arcing during pulse ablation of the present invention;

[0039] Figure 6 It is a calculation schematic diagram of the catheter electrode of the present invention. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0042] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0043] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0046] In one embodiment, Figure 1 As shown, on the one hand, the present invention provides a method for preventing arcing during pulse ablation, comprising:

[0047] S101 obtains distance information, current information, voltage information, user setting information and weight information of each electrode in the catheter.

[0048] In this embodiment, the disclosure describes an application that notifies a user when two or more electrodes are close to each other, which can address the problem that voltage arcing may occur.

[0049] Specifically, according to the distance information, current information, voltage information, user setting information and weight information of each electrode in the catheter, it is possible to more accurately and completely judge whether the distance between the electrodes is too close.

[0050] S102 determines whether adjacent electrodes exceed an acceptable distance based on the distance information, current information, voltage information, user setting information and weight information.

[0051] In this embodiment, the acceptable distance is determined by clinical doctors based on the size of the heart cavity. Generally, the longest distance of the heart cavity is 60 mm. Therefore, it is sufficient to define it as less than 60 mm.

[0052] Exemplarily, in this embodiment, the distance between electrodes is judged in parallel through distance information, current information, voltage information, and user-set information, and a weighted value, i.e., weight information, is given. This method uses a combination of multiple information sources to evaluate the possibility of an arc.

[0053] S103 When the distance between adjacent electrodes is below the acceptable distance, a warning prompt is issued;

[0054] S104: When the distance between adjacent electrodes does not exceed the acceptable distance, an ablation prompt is given.

[0055] The present invention describes an application that notifies the user when two or more electrodes are close to each other, which can solve the problem that voltage arcing may occur. In the case of contact or ablation, different treatments are given.

[0056] In one embodiment, obtaining distance information of each electrode in the catheter includes:

[0057] The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and / or magnetic positioning mode, or a combination of the two.

[0058] In one embodiment, the electrical positioning mode includes: mapping the current information, voltage information or magnetic field information measured according to the electric field and / or magnetic field environment established outside the body received by the catheter into three-dimensional coordinate information to calculate the position information of each electrode.

[0059] In this embodiment, the position information is used as a source for calculating the distance between electrodes. Source 1: The physical distance between electrodes is measured by a mapping system. The cardiac electrophysiology surgery performs three-dimensional imaging of the heart through the mapping system.

[0060] Among them, there are several positioning modes in the mapping system: electrical positioning and / or magnetic positioning.

[0061] Electrical positioning can measure current information or voltage information based on the electric field environment established outside the body by the catheter, and map it into three-dimensional coordinate information. Then, when the actual distance between the electrodes is known, the voltage and current gradient of the two electrodes in the heart with an electric field environment can be calibrated. Then, the physical distance of the electrodes can be measured outside the body.

[0062] Set R to: the distance between electrodes.

[0063] Set Z to: the impedance between electrodes.

[0064] The calculation formula is calculated by in vitro calibration: Z = A*R + B.

[0065] Depend on Figure 6 It can be seen that if there is only one correspondence between Z and R, the values ​​of A and B cannot be obtained. At this time, we can choose to increase the Z in different frequency bands and the corresponding R to obtain A and B; we can also choose R of multiple pairs of electrode pairs to obtain different Zs, thereby obtaining A and B. The formula is as follows:

[0066] ΔV 12 =V1-V2; ΔV 13 =V1-V3;

[0067]

[0068]

[0069]

[0070]

[0071]

[0072] In the calibration formula shown above, the current is constant, so as long as the voltage difference is measured and the distance between the electrodes is matched, A and B can be calculated. Then in the blood, the voltage difference is calculated first, and then the distance can be calculated.

[0073] In one embodiment, obtaining current information of each electrode in the catheter includes:

[0074] According to the predefined current activation sequence, the current information received by each electrode is determined.

[0075] In one embodiment, Source 2: current driven by one electrode, which is the voltage received on the adjacent electrode, uses a predefined current activation sequence to determine the current received in each electrode.

[0076] Among them, the predefined current meets the requirements of 1k~400KHz, and the activation order is to select one or more frequency bands within 1~400KHz to excite simultaneously, and they will be superimposed on the same waveform. Because the electric field formed is usually in three directions of XYZ, the current information\voltage information detected by the catheter can form a one-to-one correspondence, or be weighted by multiple frequency bands.

[0077] In this embodiment, the predefined sequence occurs in two or more domains, such as a spatial domain, a composite domain of TDM and FDM, including:

[0078] 1. Time domain (TDM), where each electrode transmits at a single frequency in a specific time slot. The specific time slot depends on the sampling frequency, which is generally required to be above 0.1 Hz.

[0079] 2. Frequency domain (FDM), where the transmitted signals are at different (eg, orthogonal) frequencies over a single time slot.

[0080] Specifically, the software user guide will allow the user (physician) to activate this function after placing the catheter and before applying ablation.

[0081] In one embodiment, judging whether adjacent electrodes exceed an acceptable distance based on the current information includes:

[0082] Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold I of the preset acceptable distance is exceeded max .

[0083] When judging whether the electrode distance is too close, assuming that the distance between the test electrode 1 and the test electrode 2 is considered to be too close, then as long as the judgment I 1-2 Whether the current threshold I of the set acceptable distance is exceeded max If the current threshold is exceeded, the adjacent electrodes are considered to be too close.

[0084] In one embodiment, the present invention provides a device for preventing arcing during pulse ablation, comprising:

[0085] An acquisition module, used to acquire distance information, current information, user setting information and weight information of each electrode in the catheter;

[0086] A judgment module, used to judge whether adjacent electrodes exceed an acceptable distance based on the distance information, current information, user setting information and weight information;

[0087] A warning module is used to issue a warning prompt when the adjacent electrodes are below an acceptable distance;

[0088] The ablation module is used to provide ablation prompts when the adjacent electrodes do not exceed an acceptable distance.

[0089] The present invention describes an application that notifies the user when two or more electrodes are close to each other, which can solve the problem that voltage arcing may occur. In the case of contact or ablation, different treatments are given.

[0090] In one embodiment, the acquisition module is used to:

[0091] The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and magnetic positioning mode, or a combination of the two positioning modes.

[0092] In one embodiment, the acquisition module is used to: map the current information, voltage information or magnetic field information measured by the catheter based on the electric field and / or magnetic field environment established outside the body into three-dimensional coordinate information to calculate the position information of each electrode.

[0093] In one embodiment, the acquisition module is used to:

[0094] According to the predefined current activation sequence, the current information received by each electrode is determined.

[0095] In one embodiment, the determination module is used to:

[0096] Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold I of the preset acceptable distance is exceeded max .

[0097] In this embodiment, the parts that are the same as those in the above method embodiment will not be described in detail.

[0098] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed with hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0099] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. Exemplarily, the system embodiments described above are merely schematic. Exemplarily, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation. Exemplarily, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0101] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0102] It should be noted that the above embodiments can be freely combined as needed. 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, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A method for preventing arcing during pulse ablation, characterized in that: include: Obtaining distance information, current information, voltage information, user setting information and weight information of each electrode in the catheter; Based on the distance information, current information, voltage information, user setting information and weight information, determining whether adjacent electrodes exceed an acceptable distance; When the distance between adjacent electrodes is below the acceptable level, a warning will be given; When the adjacent electrodes exceed the acceptable distance, ablation prompt is performed.

2. The method for preventing arcing during pulse ablation according to claim 1, characterized in that: The step of obtaining distance information of each electrode in the catheter includes: The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and / or magnetic positioning mode.

3. The method for preventing arcing during pulse ablation according to claim 2, characterized in that: The electrical positioning mode includes: mapping the current information or voltage information measured by the catheter receiving the electric field environment established outside the body into three-dimensional coordinate information to calculate the position information of each electrode.

4. The method for preventing arcing during pulse ablation according to claim 1, characterized in that: The step of obtaining the current information or voltage information of each electrode in the catheter comprises: The current information or voltage information received by each electrode is determined according to a predefined current / voltage activation sequence.

5. The method for preventing arcing during pulse ablation according to any one of claims 1 to 4, characterized in that: The step of judging whether adjacent electrodes exceed an acceptable distance based on the current information includes: Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold I of the preset acceptable distance is exceeded max .

6. A device for preventing arcing during pulse ablation, characterized in that: include: An acquisition module, used to acquire distance information, current information, voltage information, user setting information and weight information of each electrode in the catheter; A judgment module, used to judge whether adjacent electrodes exceed an acceptable distance based on the distance information, current information, voltage information, user setting information and weight information; A warning module is used to issue a warning prompt when the adjacent electrodes are below an acceptable distance; The ablation module is used to provide ablation prompts when adjacent electrodes exceed an acceptable distance.

7. The device for preventing arcing during pulse ablation according to claim 6, characterized in that: The acquisition module is used to: The physical distance between each electrode is located by a mapping system, which specifically includes positioning modes: electrical positioning mode and / or magnetic positioning mode.

8. The device for preventing arcing during pulse ablation according to claim 7, characterized in that: The acquisition module is used to: map the current information or voltage information measured by the catheter receiving the electric field environment established outside the body into three-dimensional coordinate information to calculate the position information of each electrode.

9. The device for preventing arcing during pulse ablation according to claim 6, characterized in that: The acquisition module is used to: According to the predefined current activation sequence, the current information received by each electrode is determined.

10. The device for preventing arcing during pulse ablation according to any one of claims 6 to 9, characterized in that: The judging module is used for: Determine the current difference I between adjacent electrodes 1-2 Whether the current threshold I of the preset acceptable distance is exceeded max .

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