Adjustable pulse ablation catheter
By designing an adjustable pulse ablation catheter, using the combined structure of the sheath and ablation electrode, the problem of excessive surgery time in the prior art is solved, and efficient ablation effect in different bronchials is achieved.
Patent Information
- Application Number
- CN202421858315.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-02
AI Technical Summary
When handling bronchials of different thicknesses, existing pulse ablation catheters require repeated push and pulling to complete ablation, resulting in too long surgery and the length of the ablation electrode cannot be flexibly adjusted to meet the needs of different bronchials.
An adjustable pulse ablation catheter is designed. Through a combined structure of sheath and ablation electrode, the handle is used to control the axial movement of the mandrel and the sheath to achieve compression and expansion of the ablation electrode, and adapt to the ablation needs of different bronchials.
It greatly shortens the operation time, improves the ablation efficiency, and can achieve continuous and uninterrupted ablation in bronchials of different thicknesses, reducing the number of surgeries.
Smart Images
Figure CN223068579U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and specifically relates to an adjustable pulsed ablation catheter. Background Art
[0002] At present, when treating chronic bronchitis, a new energy form, pulsed electric field, is used for ablation in the lower respiratory tract and bronchus of the human body. The specific operation is to use an ablation electrode to lean against the bronchus of the lung and form a high-voltage electric field with the electrode connected to the outside of the human body to cause irreversible perforation of the cell membrane of the bronchial epithelial cells for ablation. During ablation, the stent needs to completely lean against the bronchial wall and cover as much tissue as possible.
[0003] When in use, the catheter needs to pass through the working channel of the bronchoscope to reach the predetermined position of the bronchus. The maximum outer diameter after compression is limited by the inner diameter of the bronchial working channel. For an ablation electrode with a fixed length of a catheter, such as the ablation catheter mentioned in Patent CN 114098949 B, for a thinner bronchus, such as Figure 1 the dimension D1 shown, due to the compression of the ablation electrode by the bronchus, a longer ablation distance is presented, such as Figure 1 the dimension S1 shown. After ablating one position, the doctor will compress the ablation electrode, withdraw the catheter to the second ablation point, and expand it again for the second ablation. The two ablated areas are theoretically continuous and uninterrupted for the best treatment effect. However, for a thicker bronchus, such as Figure 2 the dimension D2 shown, where D2 > D1, because the length of the ablation electrode is fixed, in order to expand and fit the bronchus, the axial distance needs to be further shortened, and at this time, a shorter ablation distance is presented, such as Figure 2 the dimension S2 shown, where S2 < S1. At this time, in order to completely cover the ablation area, the doctor needs to repeatedly withdraw the catheter for ablation, increasing the ablation time. In summary, for ablations of bronchi with different thicknesses, at least hundreds of pushes and pulls are required to complete the ablation surgery of the entire bronchus, and the operation time is too long.
[0004] Therefore, there is an urgent need for an adjustable pulsed ablation catheter. Content of the Utility Model
[0005] In order to overcome the problems existing in the prior art, the purpose of the utility model is to provide an adjustable pulsed ablation catheter whose ablation electrode length can be flexibly adjusted according to the intraoperative situation to adapt to rapid ablation of bronchi with different thicknesses.
[0006] To achieve the above object, the present utility model provides the following technical solution: An adjustable pulsed ablation catheter, comprising a mandrel, an ablation electrode, an inner tube, an outer tube, a sheath tube and a handle assembly; the ablation electrode is disposed outside the mandrel, and the inner tube is disposed inside the outer tube;
[0007] The distal end of the ablation electrode is connected to the mandrel, the proximal end of the ablation electrode is clamped by the distal outer wall of the inner tube and the distal inner wall of the outer tube, and the sheath tube wraps the outer wall of the outer tube; the mandrel and the sheath tube are respectively connected to the handle assembly.
[0008] It should be noted that in the present utility model, the "distal end" refers to the end far from the handle assembly, and the "proximal end" refers to the end close to the handle assembly.
[0009] The present utility model is further configured as: The handle assembly includes a handle mandrel push-pull rod, and the handle mandrel push-pull rod is connected to the mandrel.
[0010] The present utility model is further configured as: The mandrel is inserted into the inner tube, and the handle mandrel push-pull rod controls the axial movement of the mandrel relative to the inner tube. The mandrel is used to control the ablation electrode to move to a suitable position.
[0011] The present utility model is further configured as: The handle assembly includes a handle sheath tube pull rod; the handle sheath tube pull rod is connected to the sheath tube.
[0012] The present utility model is further configured as: The adjustable pulsed ablation catheter further includes a distal fixing seat, and the distal fixing seat is disposed at the distal end of the ablation electrode to cooperate with the mandrel to fix the ablation electrode.
[0013] The present utility model is further configured as: The ablation electrode is fixed between the mandrel and the distal fixing seat by means of glue, welding or extrusion.
[0014] The present utility model is further configured as: The ablation electrode is a braided stent or a cutting stent.
[0015] The present utility model is further configured as: The ablation electrode is electrically connected to an external generator.
[0016] During actual use, when ablation of a small branch is required, the sheath tube can be controlled to move axially towards the distal fixing seat through the handle sheath tube pull rod. At this time, part of the ablation electrode is wrapped by the sheath tube, and only a small part outside the sheath tube can expand to achieve ablation of the small branch. When ablation of a thicker bronchus is performed, the sheath tube can be controlled to move proximally through the handle, so that the ablation electrode is completely exposed, and a longer area can be ablated at one time.
[0017] In summary, the beneficial effects of the above technical solutions of the utility model are as follows:
[0018] 1. The utility model integrates the sheath tube and the ablation catheter. The axial movement of the mandrel and the sheath tube can be controlled respectively through the handle, so as to realize the compression and expansion of the ablation electrode and the effective ablation length of the ablation electrode. Compared with the ablation electrode with a single fixed length in the past, the length of the ablation electrode can be flexibly adjusted according to different bronchi, so that the longer bronchi do not need to be ablated many times to complete the ablation of the target area, greatly reducing the time of the whole operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0020] Figure 1 Schematic diagram of using an ablation electrode to ablate a thinner bronchus in the prior art;
[0021] Figure 2 Schematic diagram of using an ablation electrode to ablate a thicker bronchus in the prior art;
[0022] Figure 3 Schematic diagram of an adjustable pulsed ablation catheter in the embodiment;
[0023] Figure 4 Schematic diagram of using an ablation electrode to ablate a thinner bronchus in the embodiment;
[0024] Figure 5 Schematic diagram of using an ablation electrode to ablate a thicker bronchus in the embodiment.
[0025] In the drawings, the list of components represented by each reference numeral is as follows:
[0026] 100. Pulsed ablation catheter, 110. Distal fixed seat, 120. Mandrel, 130. Ablation electrode, 140. Inner tube, 150. Outer tube, 160. Sheath tube, 200. Bronchus. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] To enable those skilled in the art to better understand the technical solution of the present utility model, the technical solution of the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model. Based on the embodiments in the present utility model, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. In addition, the directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only with reference to the directions in the drawings. Therefore, the directional terms used are for illustration rather than to limit the present utility model.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.
[0029] The present utility model will be further described below in conjunction with the drawings and preferred embodiments.
[0030] Embodiment:
[0031] As Figures 3 - 5 shown, it is a preferred embodiment of the present utility model. An adjustable pulsed ablation catheter 100 includes a mandrel 120, an ablation electrode 130, an inner tube 140, an outer tube 150, a sheath tube 160, and a handle assembly (not shown in the figure); the ablation electrode 130 is disposed outside the mandrel 120, and the inner tube 140 is disposed inside the outer tube 150;
[0032] The distal end of the ablation electrode 130 is connected to the mandrel 120, and the proximal end of the ablation electrode 130 is clamped between the distal outer wall of the inner tube 140 and the distal inner wall of the outer tube 150. The sheath tube 160 wraps the outer wall of the outer tube 150; the proximal ends of the mandrel 120 and the sheath tube 160 are respectively connected to the handle assembly.
[0033] It should be noted that in this embodiment, the "distal end" refers to the end far from the handle assembly, and the "proximal end" refers to the end close to the handle assembly.
[0034] The handle assembly includes a handle mandrel push-pull rod, and the handle mandrel push-pull rod is connected to the mandrel 120. The mandrel 120 is inserted into the inner tube 140, and the handle mandrel push-pull rod controls the axial movement of the mandrel 120 relative to the inner tube 140.
[0035] The mandrel 120 is used to control the movement of the ablation electrode 130 to a suitable position.
[0036] The pulsed ablation catheter 100 further includes a distal fixing seat 110. The distal fixing seat 110 is disposed at the distal end of the ablation electrode 130. The distal fixing seat 110 cooperates with the mandrel 120 to fix the ablation electrode 130.
[0037] The handle assembly includes a handle sheath tube pull rod; the handle sheath tube pull rod is connected to the sheath tube 160. By controlling the handle sheath tube pull rod, the sheath tube 160 is axially moved distally or proximally, so that the ablation electrode 130 is contracted into the sheath tube 160 or completely extends out of the sheath tube 160.
[0038] The ablation electrode 130 is electrically connected to an external generator, and the external generator controls the expansion or telescoping of the ablation electrode 130.
[0039] In actual application, as Figure 4 shown, when using the pulsed ablation catheter 100 for ablation, for the relatively far bronchus 200, there are often many branches, and the length of each branch is short (the illustrated dimension S3). The sheath tube can be controlled to move axially towards the distal fixing seat through the handle sheath tube pull rod. At this time, a part of the ablation electrode 130 is wrapped by the sheath tube 160. When the external generator is started at this time, only a small part of the ablation electrode 130 outside the sheath tube 160 can expand, so as to realize the ablation of the fine branches.
[0040] As Figure 5 shown, when the proximal bronchus 200 is thicker, that is, D4 > D3, the number of its branches decreases, and the length of a single bronchus 200 is longer, that is, S4 > S3. At this time, the sheath tube 160 can be controlled to move proximally through the handle sheath tube pull rod, so that the ablation electrode 130 is completely exposed, and then the external generator is started, and a longer area S4 can be ablated at one time.
[0041] To sum up, the present utility model controls the length of the ablation electrode by the axial position of the sheath tube relative to the ablation electrode, so as to realize the adjustability of different ablation lengths with one ablation catheter; and the structures of the control sheath tube and the ablation catheter are integrated on one handle component, making the size control more accurate.
[0042] Finally, it should be noted that the above embodiments only represent one or several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.
Claims
1. An adjustable pulsed ablation catheter, characterized in that, It includes a mandrel, an ablation electrode, an inner tube, an outer tube, a sheath tube and a handle assembly; the ablation electrode is disposed outside the mandrel, and the inner tube is disposed inside the outer tube; The distal end of the ablation electrode is connected to the mandrel, the proximal end of the ablation electrode is clamped by the distal outer wall of the inner tube and the distal inner wall of the outer tube, and the sheath tube wraps the outer wall of the outer tube; the mandrel and the sheath tube are respectively connected to the handle assembly.
2. The adjustable pulsed ablation catheter according to claim 1, characterized in that, The handle assembly includes a handle mandrel push-pull rod, and the handle mandrel push-pull rod is connected to the mandrel.
3. The adjustable pulsed ablation catheter according to claim 2, wherein, The mandrel is inserted into the inner tube, and the handle mandrel push-pull rod controls the axial movement of the mandrel relative to the inner tube.
4. The adjustable pulsed ablation catheter according to claim 1, wherein, The handle assembly includes a handle sheath tube pull rod; the handle sheath tube pull rod is connected to the sheath tube.
5. An adjustable pulsed ablation catheter according to claim 1, wherein The adjustable pulsed ablation catheter further includes a distal fixing seat, the distal fixing seat is disposed at the distal end of the ablation electrode, and the distal fixing seat cooperates with the mandrel to fix the ablation electrode.
6. The adjustable pulse ablation catheter according to claim 5, characterized in that, The ablation electrode is fixed between the mandrel and the distal fixing seat by means of glue, welding or extrusion.
7. An adjustable pulsed ablation catheter according to claim 1, characterized in that, The ablation electrode is a braided stent or a cutting stent.
8. An adjustable pulsed ablation catheter according to claim 1, wherein The ablation electrode is electrically connected to an external generator.