Ablation system and method for determining attachment length

Abstract

The invention discloses an ablation system and an attaching length determination method.The ablation system comprises an ablation catheter, a control host and a displayer, the ablation catheter comprises a mandrel, an ablation electrode connected with the far end of the mandrel, a pushing piece connected with the near end of the mandrel and an operating handle connected with the pushing piece in a sliding mode; the ablation electrode expands or contracts along with the movement of the mandrel in the axial direction; before the peripheral surface of the ablation electrode is not in contact with the wall of the trachea, the impedance between the ablation electrode and the trachea is kept unchanged, and when the impedance is changed, the peripheral surface of the ablation electrode is in contact with the wall of the trachea, and the amplitude of reduction of the impedance between the ablation electrode and the trachea is greater than a threshold value, the ablation electrode is in a maximum expansion state. The ablation system provided by the invention can improve the effectiveness of treatment.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an ablation system and a method for determining the contact length. Background Technology

[0002] Pulsed field ablation (PFA), as a novel and effective interventional ablation therapy, works by applying intermittent, high-intensity pulsed electric fields over a very short period, causing irreversible electroporation of the cell membrane and leading to cell death. For ablation treatment targeting different lesion sites, the use of appropriate ablation electrodes allows for precise ablation of the lesion, reducing energy loss and improving the therapeutic effect.

[0003] In pulsed electric field ablation, nanosecond pulses with durations on the order of nanoseconds can more effectively destroy cell membranes and enhance the ablation effect due to their high voltage and short duration. Furthermore, nanosecond pulses are usually applied at high frequencies, which can apply multiple high-energy impacts to the cell membrane in a short period of time.

[0004] Chronic obstructive pulmonary disease (COPD) is a common chronic disease characterized by airflow obstruction, which is characterized by chronic bronchitis and / or emphysema and can further develop into pulmonary heart disease and respiratory failure. It is associated with abnormal inflammatory responses to harmful gases and particles and has a high rate of disability and mortality.

[0005] Pulsed electric field ablation, especially nanosecond pulse ablation, can effectively treat chronic obstructive pulmonary disease. However, operators currently face certain operational difficulties when manipulating the ablation catheter to ablate the target area, and the effectiveness of the treatment needs further improvement. Summary of the Invention

[0006] This application provides an ablation system and a method for determining the contact length, which can improve the effectiveness of treatment.

[0007] The first aspect of this application provides an ablation system, the ablation system comprising: an ablation catheter including a mandrel, an ablation electrode connected to the distal end of the mandrel, a pusher connected to the proximal end of the mandrel, and an operating handle slidably connected to the pusher, wherein the ablation electrode expands or contracts as the mandrel moves axially;

[0008] Control host;

[0009] and monitor;

[0010] Before the outer peripheral surface of the ablation electrode comes into contact with the wall of the trachea, the impedance between the ablation electrode and the trachea remains constant. When the impedance changes, the outer peripheral surface of the ablation electrode comes into contact with the wall of the trachea. When the magnitude of the decrease in impedance between the ablation electrode and the trachea is greater than a threshold, the ablation electrode exhibits a maximum expansion state.

[0011] A second aspect of this application provides a method for determining the contact length, the method comprising: obtaining the real-time displacement distance of the mandrel in the ablation catheter relative to the operating handle, wherein the distal end of the mandrel is connected to the ablation electrode, the proximal end is connected to the pusher, the pusher is slidably connected to the operating handle, and the ablation electrode expands or contracts as the mandrel moves axially; obtaining the diameter of the trachea; and determining the real-time contact length between the ablation electrode and the trachea based on the real-time displacement distance and the diameter of the trachea.

[0012] A third aspect of this application provides an ablation system, the ablation system comprising:

[0013] An ablation catheter includes a mandrel, an ablation electrode connected to the distal end of the mandrel, a pusher connected to the proximal end of the mandrel, and an operating handle slidably connected to the pusher. The ablation electrode expands or contracts as the mandrel moves axially.

[0014] Control host;

[0015] and monitor;

[0016] The ablation system monitors the impedance between the ablation electrode and the trachea. When the outer peripheral surface of the ablation electrode is in a state of no contact with the wall of the trachea, the impedance decreases. When the outer peripheral surface of the ablation electrode changes from a contact state to a non-contact state with the wall of the trachea, the impedance gradually increases.

[0017] The beneficial effects are: This application determines the state of the ablation electrode by measuring the impedance change between the ablation electrode and the trachea, which can avoid excessive pushing of the pusher and cause deformation of the ablation electrode in the body, thereby improving the effectiveness of treatment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 This is a schematic diagram of one embodiment of the ablation system of this application;

[0020] Figure 2 This is a schematic diagram showing the real-time contact state between the ablation electrode and the trachea.

[0021] Figure 3 yes Figure 1 A schematic diagram of one embodiment of the ablation catheter;

[0022] Figure 4 This is a flowchart illustrating one implementation method for determining the attachment length in this application;

[0023] Figure 5 This is a schematic diagram of the structure of one embodiment of the control host of this application;

[0024] Figure 6 This is a schematic diagram of one embodiment of the computer-readable storage medium of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that the terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0027] In this invention, "distal" and "proximal" are directional terms commonly used in the field of interventional medical devices. "Distal" refers to the end furthest from the operator during surgery, while "proximal" refers to the end closest to the operator. "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the medical device; "radial" refers to the direction perpendicular to the aforementioned "axial".

[0028] See Figure 1 , Figure 1This is a schematic diagram of one embodiment of the ablation system of this application. The ablation system includes an ablation catheter 110, a control host 120, and a display 130.

[0029] The ablation catheter 110 includes a mandrel 111, an ablation electrode 112 connected to the distal end of the mandrel 111, a pusher 113 connected to the proximal end of the mandrel 111, and an operating handle 114 slidably connected to the pusher 113. The pusher 113 is used to drive the mandrel 111 to move axially relative to the operating handle 114, and the ablation electrode 112 expands or contracts as the mandrel 111 moves axially. Specifically, the ablation electrode 112 expands as the mandrel 111 moves axially away from the operating handle 114, and contracts as the mandrel 111 moves axially closer to the operating handle 114.

[0030] Specifically, the mandrel 111 extends axially along the ablation catheter 110. The ablation electrode 112, also known as a single electrode, is the electrode of the ablation catheter 110 and is used to receive pulsed ablation signals to generate a pulsed ablation electric field, causing irreversible damage to the cell membrane through electroporation, leading to cell death and achieving ablation. In one embodiment, the ablation electrode 112 has a woven basket structure that can expand or contract radially. Simultaneously, the pusher 113 is slidably connected to the operating handle 114. During the procedure, when the operator pushes the pusher 113 distally, the ablation electrode 112 moves distally under the influence of the mandrel 111. When the operator pulls the pusher 113 proximally, the ablation electrode 112 moves proximally under the influence of the mandrel 111. Meanwhile, as the ablation electrode 112 moves toward the distal end, the ablation electrode 112 gradually expands radially, that is, the ablation electrode 112 is gradually released. As the ablation electrode 112 moves toward the proximal end, the ablation electrode 112 gradually contracts radially.

[0031] In one embodiment, in the initial state (when the operator has not pushed the pusher 113 to the distal end), the ablation electrode 112 remains in a contracted state, with its outer diameter remaining at about 3 mm. When the pusher 113 slides to the extreme position at the distal end, the ablation electrode 112 is fully released to form a balloon-like state with an outer diameter of 20 to 30 mm.

[0032] See Figure 2 , Figure 2The image shows the ablation electrode 112 positioned within the trachea 20. During treatment, the ablation electrode 112 can be mounted in an endoscope and delivered to the target treatment area within the trachea 20 via the endoscope. The ablation electrode 112 then extends from the endoscope to ablate the target tissue. The endoscope can only reach the fourth level of the bronchus; subsequent levels 5 and above require the ablation catheter 110 to enter and ablate. Throughout the treatment, only the proximal end (the end closest to the operator) of the ablation electrode 112 can be roughly observed through the endoscopic view; the distal end's extension and retraction cannot be identified. Furthermore, after the operator releases the ablation electrode 112 using the pusher 113, the electrode does not provide deformation feedback, making it difficult for the operator to discern the real-time contact between the ablation electrode 112 and the trachea 20. This hinders the operator from accurately determining the number of ablation cycles, increasing the difficulty of the ablation process.

[0033] To avoid the above problems, please refer to [further details]. Figure 1 and Figure 2 In this application, the ablation catheter 110 is further equipped with a displacement sensor 115. The displacement sensor 115 is used to collect the real-time displacement distance of the mandrel 111 relative to the operating handle 114. At the same time, the control host 120 is electrically connected to the displacement sensor 115 (which can be electrically connected through the signal line 10) to determine the real-time contact length L1 between the ablation electrode 112 and the trachea 20 based on the real-time displacement distance collected by the displacement sensor 115 and the diameter D of the trachea 20.

[0034] Specifically, after the ablation electrode 112 enters the trachea 20, regardless of how the ablation electrode 112 expands, the diameter D of the trachea 20 remains unchanged or changes very little, which can be ignored. The real-time contact length L1 between the ablation electrode 112 and the trachea 20 is determined by the degree of expansion of the ablation electrode 112 and the diameter D of the trachea 20. Specifically, for the same trachea 20, before the outer circumferential surface of the ablation electrode 112 contacts the wall of the trachea 20, the real-time contact length L1 between the ablation electrode 112 and the trachea 20 is equal to 0. After the ablation electrode 112 expands to the point where its outer peripheral surface contacts the wall of the trachea 20, as the ablation electrode 112 expands further, the real-time contact length L1 between the ablation electrode 112 and the trachea 20 increases until the ablation electrode 112 expands to its limit. For different tracheas 20, after the outer peripheral surface of the ablation electrode 112 contacts the wall of the trachea 20, under the same degree of expansion of the ablation electrode 112, the smaller the diameter D of the trachea 20, the larger the real-time contact length L1 between the ablation electrode 112 and the trachea 20.

[0035] As mentioned above, the degree of expansion of the ablation electrode 112 depends on the displacement distance of the mandrel 111 relative to the operating handle 114. Specifically, in the initial state, the displacement distance of the mandrel 111 relative to the operating handle 114 is 0. As the mandrel 111 moves towards the distal end of the operating handle 114, the displacement distance of the mandrel 111 relative to the operating handle 114 increases, and the ablation electrode 112 expands further. Therefore, the degree of expansion of the ablation electrode 112 is related to the real-time displacement distance of the mandrel 111 relative to the operating handle 114. Consequently, the real-time contact length L1 between the ablation electrode 112 and the trachea 20 is indirectly related to the real-time displacement distance of the mandrel 111 relative to the operating handle 114.

[0036] Therefore, the control host 120 can determine the real-time contact length L1 between the ablation electrode 112 and the trachea 20 based on the real-time displacement distance collected by the displacement sensor 115 and the diameter D of the trachea 20. The specific process for determining the real-time contact length L1 is described below.

[0037] After obtaining the real-time contact length L1, the control host 120 can also generate a real-time contact status diagram of the ablation electrode 112 and the trachea 20 based on the real-time contact length L1. Finally, the display 130, which is electrically connected to the control host 120, displays the real-time contact status diagram and the real-time contact length L1.

[0038] Thus, during the treatment process, the operator can adjust the number of ablation cycles by using the real-time adhesion status diagram and the real-time adhesion length L1 displayed on the monitor 130, thereby increasing the effectiveness of the treatment.

[0039] In one embodiment, the control host 120 can be integrated on the pulse ablation host. In addition to the control host 120, the pulse ablation host can also integrate a pulse device for generating a pulse ablation signal and sending the pulse ablation signal to the ablation electrode 112.

[0040] The displacement sensor 115 can be either a contact displacement sensor or a non-contact displacement sensor. Contact displacement sensors typically come into direct contact with the object being measured and operate by measuring the object's displacement. Non-contact displacement sensors, on the other hand, do not come into direct contact with the object and sense displacement by measuring changes in electromagnetic fields, optical phenomena, or other physical phenomena. Furthermore, the working principle of the displacement sensor 115 can be capacitive, eddy current, or laser. Capacitive displacement sensors measure distance using changes in capacitance; eddy current displacement sensors measure distance using changing magnetic fields; and laser displacement sensors measure distance by emitting laser light and measuring changes in the reflected laser light.

[0041] When the displacement sensor 115 is a contact displacement sensor, it can specifically be a potentiometer-type displacement sensor, which senses displacement by measuring changes in resistance. Its movable brush is connected to the object being measured; when the object moves, the position of the brush changes, causing a change in resistance, thereby outputting a corresponding electrical signal. When the displacement sensor 115 is a non-contact displacement sensor, it can specifically be a Hall effect or photoelectric displacement sensor. A Hall effect displacement sensor utilizes the Hall effect principle, sensing displacement by measuring changes in the magnetic field; a photoelectric displacement sensor utilizes the photoelectric effect, sensing displacement by measuring changes in the light signal.

[0042] In one embodiment, combined with Figure 1 as well as Figure 3 The operating handle 114 has a receiving cavity 1141, the proximal end of the spindle 111 extends into the receiving cavity 1141, and the displacement sensor 115 is located in the receiving cavity 1141. This arrangement can protect the displacement sensor 115 using the operating handle 114 and also ensure the accuracy of the signals collected by the displacement sensor 115.

[0043] However, in other embodiments, the displacement sensor 115 may also be disposed on the outer surface of the operating handle 114, or on the spindle 111, the ablation electrode 112, or the pusher 113. In short, this application does not limit the type or placement of the displacement sensor 115.

[0044] Continue reading Figure 3 In one embodiment, the displacement sensor 115 includes a sensing end 1151 and a data acquisition end 1152. One of the sensing end 1151 and the data acquisition end 1152 is connected to the operating handle 114, and the other is connected to the spindle 111. Alternatively, the sensing end 1151 can be connected to the operating handle 114, and the data acquisition end 1152 can be connected to the spindle 111; or the sensing end 1151 can be connected to the spindle 111, and the data acquisition end 1152 can be connected to the operating handle 114. For ease of explanation, the following example illustrates the solution where the sensing end 1151 is connected to the operating handle 114, and the data acquisition end 1152 is connected to the spindle 111:

[0045] As the acquisition end 1152 moves relative to the sensing end 1151, the sensing end 1151 generates a sensing signal representing the displacement distance between the acquisition end 1152 and the sensing end 1151, and sends the signal to the control host 120. Since the acquisition end 1152 is connected to the spindle 111, the displacement distance between the sensing end 1151 and the acquisition end 1152 is also the displacement distance of the spindle 111 relative to the operating handle 114, thus achieving the purpose of acquiring the displacement distance of the spindle 111 relative to the operating handle 114.

[0046] In one embodiment, combined with Figure 1 and Figure 2 The control unit 120 determines the diameter D of the trachea 20 through the following steps:

[0047] S121: When the impedance between the ablation electrode 112 and the trachea 20 is detected to decrease, the maximum expansion diameter H of the ablation electrode 112 at the current moment is determined based on the real-time displacement distance collected by the displacement sensor 115 at the current moment.

[0048] S122: Determine the diameter D of the trachea 20 based on the maximum expansion diameter H at the current moment.

[0049] Specifically, before the outer peripheral surface of the ablation electrode 112 contacts the wall of the trachea 20, the impedance between the ablation electrode 112 and the trachea 20 remains constant. Once the outer peripheral surface of the ablation electrode 112 contacts the wall of the trachea 20, the impedance between the ablation electrode 112 and the trachea 20 decreases sharply. Therefore, when the decrease in impedance between the ablation electrode 112 and the trachea 20 is detected, it means that at the current moment, the outer peripheral surface of the ablation electrode 112 is just touching the wall of the trachea 20. Thus, at the current moment, the maximum expansion diameter H of the ablation electrode 112 is equal to the diameter D of the trachea 20.

[0050] In order to reduce misjudgment and improve accuracy, efficiency and treatment effect, step S121 can also determine the maximum expansion diameter H of the ablation electrode 112 at the current moment based on the real-time displacement distance collected by the displacement sensor 115 when the amplitude of the decrease in impedance between the ablation electrode 112 and the trachea 20 is greater than the amplitude threshold.

[0051] In other embodiments, the diameter D of the trachea 20 can also be determined in other ways, such as by using images captured by an endoscope. Specifically, the endoscope captures images of the trachea 20 during the process of delivering the ablation electrode 112 to the target position, and then the control host 120 determines the diameter of the trachea 20 using an image processing algorithm based on the images captured by the endoscope.

[0052] In one embodiment, step S122 specifically includes: determining the maximum expansion diameter H of the ablation electrode 112 at the current moment based on the pre-established correspondence between the real-time displacement distance and the maximum expansion diameter H.

[0053] Specifically, a correspondence is established in advance between the real-time displacement distance of the displacement sensor 115 and the maximum expansion diameter H of the ablation electrode 112, and this correspondence is stored in the database. Then, after obtaining the real-time displacement distance at the current moment, the maximum expansion diameter H corresponding to the real-time displacement distance at the current moment is searched in the correspondence in the database, and the maximum expansion diameter H of the ablation electrode 112 at the current moment is determined based on the found maximum expansion diameter H.

[0054] Specifically, when searching for the maximum expansion diameter H corresponding to the real-time displacement distance at the current moment in the database, if the database contains the real-time displacement distance at the current moment, the maximum expansion diameter H corresponding to the real-time displacement distance at the current moment can be directly determined as the maximum expansion diameter H of the ablation electrode 112 at the current moment. However, if the database does not contain the real-time displacement distance at the current moment, the database can search for the real-time displacement distance closest to the current moment and determine the maximum expansion diameter H corresponding to that real-time displacement distance as the maximum expansion diameter H of the ablation electrode 112 at the current moment. Alternatively, if the database does not contain the real-time displacement distance at the current moment, the database can search for a first displacement distance and a second displacement distance adjacent to the current moment's real-time displacement distance, where the first displacement distance is greater than the current moment's real-time displacement distance and the second displacement distance is less than the current moment's real-time displacement distance. Then, based on the maximum expansion diameter H corresponding to the first displacement distance and the maximum expansion diameter H corresponding to the second displacement distance in the database, the maximum expansion diameter H of the ablation electrode 112 at the current moment is determined by interpolation.

[0055] It should be noted that in other embodiments, a mathematical relationship between the real-time displacement distance and the maximum expansion diameter H can be pre-fitted, and then the real-time displacement distance at the current moment can be substituted into the mathematical relationship to obtain the maximum expansion diameter H of the ablation electrode 112 at the current moment.

[0056] In one embodiment, combined with Figure 1 and Figure 2 The control host 120 determines the real-time contact length L1 through the following steps:

[0057] S131: Substitute the real-time displacement distance and the diameter D of the trachea 20 into the pre-fitted mathematical relationship to obtain the real-time contact length L1 between the ablation electrode 112 and the trachea 20.

[0058] Specifically, a mathematical relationship between the real-time displacement distance of the displacement sensor 115, the diameter D of the trachea 20, and the real-time contact length L1 is pre-fitted. The independent variables of this mathematical relationship are the real-time displacement distance of the displacement sensor 115 and the diameter D of the trachea 20, and the dependent variable is the real-time contact length L1. Therefore, during use, by substituting the real-time displacement distance and the diameter D of the trachea 20 into this mathematical relationship, the real-time contact length L1 between the ablation electrode 112 and the trachea 20 can be obtained.

[0059] In another embodiment, combined Figure 1 and Figure 2 The control host 120 determines the real-time contact length L1 through the following steps:

[0060] S132: Based on the pre-established correspondence between the real-time displacement distance, the diameter D of the trachea 20, and the real-time contact length L1, determine the real-time contact length L1 between the ablation electrode 112 and the trachea 20.

[0061] Specifically, a correspondence is established in advance between the real-time displacement distance of the displacement sensor 115, the diameter D of the trachea 20, and the real-time contact length L1, and this correspondence is stored in the database. Then, during the processing, the real-time contact length L1 corresponding to both the real-time displacement distance and the diameter D of the trachea 20 is searched in the database to obtain the real-time contact length L1 at the current moment.

[0062] During the search, if the real-time displacement distance and the diameter D of the trachea 20 do not exist in the database, the distance closest to the real-time displacement distance and the diameter closest to the diameter D of the trachea 20 can be searched. The real-time contact length L1 corresponding to the closest distance and the closest diameter can be determined as the real-time contact length L1 between the ablation electrode 112 and the trachea 20 at the current moment.

[0063] In one embodiment, combined with Figure 1 and Figure 2 The control host 120 generates a real-time contact status diagram between the ablation electrode 112 and the trachea 20 through the following steps:

[0064] S141: Determine the real-time expansion state of the ablation electrode 112 based on the real-time displacement distance collected by the displacement sensor 115 and the diameter D of the trachea 20.

[0065] S142: Based on the real-time expansion state of the ablation electrode 112, the diameter of the trachea 20, and the real-time contact length L1, generate a real-time contact state diagram between the ablation electrode 112 and the trachea 20.

[0066] Specifically, the real-time expansion state of the ablation electrode 112 includes parameters such as the real-time axial length L2 of the ablation electrode 112 and the diameter of the ablation electrode 112 at various points.

[0067] As can be seen from the foregoing, the greater the real-time displacement distance of the mandrel 111 relative to the operating handle 114, the more the ablation electrode 112 expands. Since the ablation electrode 112 is located in the trachea 20, the real-time expansion state of the ablation electrode 112 is also related to the diameter of the trachea 20. Therefore, the real-time expansion state of the ablation electrode 112 can be determined based on the real-time displacement distance collected by the displacement sensor 115 and the diameter of the trachea 20.

[0068] Finally, after obtaining the real-time expansion state of the ablation electrode 112, the diameter D of the trachea 20, and the real-time contact length L1, a real-time contact state diagram of the ablation electrode 112 and the trachea 20 can be drawn.

[0069] It should be noted that, in other embodiments, the specific process of determining the real-time contact state diagram of the ablation electrode 112 and the trachea 20 based on the real-time contact length L1 can also be as follows: retrieve the image corresponding to the real-time contact length L1 from the images pre-saved in the database, and use this image as the real-time contact state diagram of the ablation electrode 112 and the trachea 20. In other words, multiple images are pre-stored in the database, and each image corresponds to a real-time snapping length L1. When retrieving images, if the real-time snapping length L1 exists in the database, the real-time snapping state image corresponding to the real-time snapping length L1 can be retrieved directly. However, if the real-time snapping length L1 does not exist in the database, the snapping length closest to the real-time snapping length L1 is searched, and the image corresponding to the closest snapping length is determined as the real-time snapping state image. Alternatively, the first snapping length and the second snapping length located on both sides of the real-time snapping length L1 (one of the first snapping length and the second snapping length is greater than the real-time snapping length L1, and the other is less than the real-time snapping length L1) can be searched. Then, based on the image in the database corresponding to the first snapping length and the image corresponding to the second snapping length, the real-time snapping state image corresponding to the real-time snapping length L1 is determined.

[0070] In one embodiment, step S141 specifically involves: determining the real-time expansion state of the ablation electrode 112 based on a pre-established correspondence. Specifically, in the pre-established correspondence between the real-time displacement distance, the diameter D of the trachea 20, and the expansion state of the ablation electrode 112, the real-time expansion state of the ablation electrode 112 that simultaneously corresponds to both the real-time displacement distance and the diameter D of the trachea 20 is searched. The search process is similar to the process of searching for the real-time contact length L1 described above, and details can be found in the relevant content above, which will not be repeated here.

[0071] See Figure 4 , Figure 4 This is a flowchart illustrating one embodiment of the method for determining the attachment length in this application. The method includes:

[0072] S110: Obtain the real-time displacement distance of the mandrel in the ablation catheter relative to the operating handle.

[0073] The distal end of the mandrel is connected to the ablation electrode, and the proximal end is connected to the pusher. The pusher is slidably connected to the operating handle. The ablation electrode expands or contracts as the mandrel moves axially.

[0074] S120: Obtain the diameter of the trachea.

[0075] S130: Determine the real-time contact length between the ablation electrode and the trachea based on the real-time displacement distance and the diameter of the trachea.

[0076] In one embodiment, step S120 specifically includes:

[0077] S121: When a decrease in impedance between the ablation electrode and the trachea is detected, the real-time displacement distance collected by the displacement sensor at the current moment is obtained.

[0078] S122: Determine the maximum expansion diameter of the ablation electrode at the current moment based on the real-time displacement distance collected by the displacement sensor.

[0079] S123: Determine the diameter of the trachea based on the maximum expansion diameter.

[0080] In one embodiment, step S122 includes: determining the maximum expansion diameter of the ablation electrode at the current moment based on a pre-established correspondence between real-time displacement distance and maximum expansion diameter.

[0081] In one embodiment, step S130 includes: inputting the real-time displacement distance and the diameter of the trachea into a pre-fitted mathematical relationship to obtain the real-time contact length between the ablation electrode and the trachea.

[0082] In another embodiment, step S130 includes: determining the real-time contact length between the ablation electrode and the trachea based on a pre-established correspondence between the real-time displacement distance, the diameter of the trachea, and the real-time contact length.

[0083] In one embodiment, the method further includes the following after step S130:

[0084] S140: Determine the real-time contact status diagram between the ablation electrode and the trachea based on the real-time contact length.

[0085] In one embodiment, step S140 specifically includes:

[0086] S141: Determine the real-time expansion state of the ablation electrode based on the real-time displacement distance collected by the displacement sensor and the diameter of the trachea.

[0087] S142: Generate a real-time contact diagram between the ablation electrode and the trachea based on the real-time expansion state of the ablation electrode, the diameter of the trachea, and the real-time contact length.

[0088] In this embodiment, the method for determining the contact length is executed by the control host 120 in the above embodiment. For details of the process, please refer to the relevant content above, which will not be repeated here.

[0089] Continue reading Figure 1 In another embodiment of this application, the ablation system includes an ablation catheter 110, a control host 120, and a display 130.

[0090] The ablation catheter 110 includes a mandrel 111, an ablation electrode 112 connected to the distal end of the mandrel 111, a pusher 113 connected to the proximal end of the mandrel 111, and an operating handle 114 slidably connected to the pusher 113. The ablation electrode 112 expands or contracts as the mandrel 111 moves axially.

[0091] Before the outer peripheral surface of the ablation electrode 112 comes into contact with the wall of the trachea 20, the impedance between the ablation electrode 112 and the trachea 20 remains unchanged. When the impedance changes, the outer peripheral surface of the ablation electrode 112 comes into contact with the wall of the trachea 20. When the magnitude of the decrease in impedance between the ablation electrode 112 and the trachea 20 is greater than the threshold, the ablation electrode 112 exhibits the maximum expansion state.

[0092] In one embodiment, the ablation electrode 112 is a single electrode, and the ablation electrode 112 has a woven basket structure that expands or contracts radially.

[0093] In one embodiment, when the ablation electrode 112 is in a contracted state, its outer diameter is about 3 mm. When the pusher 113 slides to the extreme position at the distal end, the ablation electrode 112 is fully released to form a balloon-like state with an outer diameter of 20 mm to 30 mm.

[0094] In one embodiment, the degree of expansion or contraction of the ablation electrode 112 is monitored through an endoscopic view.

[0095] Continue reading Figure 1 In another embodiment of this application, the ablation system includes an ablation catheter 110, a control host 120, and a display 130.

[0096] The ablation catheter 110 includes a mandrel 111, an ablation electrode 112 connected to the distal end of the mandrel 111, a pusher 113 connected to the proximal end of the mandrel 111, and an operating handle 114 slidably connected to the pusher 113. The ablation electrode 112 expands or contracts as the mandrel 111 moves axially.

[0097] The ablation system monitors the impedance between the ablation electrode 112 and the trachea 20. When the outer peripheral surface of the ablation electrode 112 is in a state of no contact with the wall of the trachea 20, the impedance decreases. When the outer peripheral surface of the ablation electrode 112 changes from a contact state to a non-contact state with the wall of the trachea 20, the impedance gradually increases.

[0098] In one embodiment, the ablation electrode 112 is a single electrode, and the ablation electrode 112 has a woven basket structure that expands or contracts radially.

[0099] In one embodiment, when the ablation electrode 112 is in a contracted state, its outer diameter is about 3 mm. When the pusher 113 slides to the extreme position at the distal end, the ablation electrode 112 is fully released to form a balloon-like state with an outer diameter of 20 mm to 30 mm.

[0100] See Figure 5 , Figure 5 This is a schematic diagram of the structure of a control host according to one embodiment of the present application. The control host includes a processor 210, a memory 220 and a communication circuit 230. The processor 210 is coupled to the memory 220 and the communication circuit 230 respectively. The memory 220 stores program data. The processor 210 executes the program data in the memory 220 to implement the method for determining the contact length in any of the above embodiments. The detailed method steps can be found in the above embodiments and will not be repeated here.

[0101] See Figure 6 , Figure 6 This is a schematic diagram of one embodiment of the computer-readable storage medium of this application. The computer-readable storage medium 400 stores a computer program 410, which can be executed by a control host to implement the steps in any of the above methods.

[0102] Specifically, the computer-readable storage medium 400 can be a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, or a device that can store the computer program 410. Alternatively, it can be a server that stores the computer program 410, which can send the stored computer program 410 to other devices for execution, or it can run the stored computer program 410 itself.

[0103] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An ablation system, comprising: An ablation catheter includes a mandrel, an ablation electrode connected to the distal end of the mandrel, a pusher connected to the proximal end of the mandrel, and an operating handle slidably connected to the pusher. The ablation electrode expands or contracts as the mandrel moves axially. Control host; and monitor; Its characteristics are: Before the outer peripheral surface of the ablation electrode comes into contact with the wall of the trachea, the impedance between the ablation electrode and the trachea remains constant. When the impedance changes, the outer peripheral surface of the ablation electrode comes into contact with the wall of the trachea. When the magnitude of the decrease in impedance between the ablation electrode and the trachea is greater than a threshold, the ablation electrode exhibits a maximum expansion state.

2. The ablation system according to claim 1, characterized in that, The ablation electrode is a single electrode, and the ablation electrode has a woven basket structure that expands or contracts radially.

3. The ablation system according to claim 1, characterized in that, When the ablation electrode is in the contracted state, its outer diameter is about 3 mm. When the pusher slides to the extreme position at the distal end, the ablation electrode is fully released to form a balloon-like state with an outer diameter of 20 mm to 30 mm.

4. The ablation system according to claim 1, characterized in that, The degree of expansion or contraction of the ablation electrode is monitored through an endoscopic view.

5. A method for determining the contact length, characterized in that, The method includes: The real-time displacement distance of the mandrel relative to the operating handle in the ablation catheter is obtained, wherein the distal end of the mandrel is connected to the ablation electrode, the proximal end is connected to the pusher, the pusher is slidably connected to the operating handle, and the ablation electrode expands or contracts as the mandrel moves axially. Obtain the diameter of the trachea; The real-time contact length between the ablation electrode and the trachea is determined based on the real-time displacement distance and the diameter of the trachea.

6. The method according to claim 5, characterized in that, The step of determining the real-time contact length between the ablation electrode and the trachea based on the real-time displacement distance and the diameter of the trachea includes: Substituting the real-time displacement distance and the diameter of the trachea into a pre-fitted mathematical formula, the real-time contact length between the ablation electrode and the trachea is obtained, or... Based on the pre-established correspondence between the real-time displacement distance, the diameter of the trachea, and the real-time contact length, the real-time contact length between the ablation electrode and the trachea is determined.

7. The method according to claim 5, characterized in that, The step of obtaining the diameter of the trachea includes: When a decrease in impedance between the ablation electrode and the trachea is detected, the maximum expansion diameter of the ablation electrode at the current moment is determined based on the real-time displacement distance collected at the current moment. The diameter of the trachea is determined based on the maximum expansion diameter.

8. The method according to claim 7, characterized in that, The step of determining the maximum expansion diameter of the ablation electrode at the current moment based on the real-time displacement distance collected at the current moment includes: Based on the pre-established correspondence between the real-time displacement distance and the maximum expansion diameter, the maximum expansion diameter of the ablation electrode at the current moment is determined.

9. The method according to claim 5, characterized in that, The method further includes: The real-time expansion state of the ablation electrode is determined based on the real-time displacement distance and the diameter of the trachea. Based on the real-time expansion state of the ablation electrode, the diameter of the trachea, and the real-time contact length, a real-time contact state diagram of the ablation electrode and the trachea is generated.

10. An ablation system, comprising: An ablation catheter includes a mandrel, an ablation electrode connected to the distal end of the mandrel, a pusher connected to the proximal end of the mandrel, and an operating handle slidably connected to the pusher. The ablation electrode expands or contracts as the mandrel moves axially. Control host; and monitor; Its characteristics are: The ablation system monitors the impedance between the ablation electrode and the trachea. When the outer peripheral surface of the ablation electrode is in a state of no contact with the wall of the trachea, the impedance decreases. When the outer peripheral surface of the ablation electrode changes from a contact state to a non-contact state with the wall of the trachea, the impedance gradually increases.

11. The ablation system according to claim 10, characterized in that, The ablation electrode is a single electrode, and the ablation electrode has a woven basket structure that expands or contracts radially.

12. The ablation system according to claim 10, characterized in that, When the ablation electrode is in the contracted state, its outer diameter is about 3 mm. When the pusher slides to the extreme position at the distal end, the ablation electrode is fully released to form a balloon-like state with an outer diameter of 20 mm to 30 mm.

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