An electrode ablation catheter
By designing a multi-electrode ablation catheter and utilizing shape memory alloy materials and independent electrode control, multiple ablation modes of the electrode ablation catheter were realized, solving the problem of poor ablation effect caused by the single number and distribution of electrodes in the existing technology, and improving the accuracy and effect of ablation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU HAIYU XINCHEN MEDICAL TECH CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-14
AI Technical Summary
Existing electrode ablation catheters have a limited number of electrodes and a single electrode distribution pattern, making it impossible to flexibly adjust them according to the complex conditions of different lesion areas. This results in poor ablation effects, especially in terms of precise ablation in small areas and insufficient penetration into deep tissues.
A multi-electrode ablation catheter was designed, comprising a tip electrode, multiple annular segment electrodes, and an adjustment rod. Utilizing shape memory alloy material, it enables independent control and position adjustment of the electrodes, supporting multiple ablation modes, including local directional, annular/linear ablation, and deep penetration.
It enables flexible ablation of different lesion areas, improves the accuracy and effectiveness of ablation, and meets the diverse ablation needs of complex lesions.
Smart Images
Figure CN224484141U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ablation catheters, and more specifically, to an electrode ablation catheter. Background Technology
[0002] An electrode ablation catheter is a thin, flexible tubular medical device, typically consisting of a catheter body, electrodes, connecting wires, and a control handle. It can be precisely delivered to the lesion site inside the body through blood vessels or natural cavities, using the electrodes to release energy to destroy or alter the structure and function of the diseased tissue, thereby achieving the purpose of treating the disease.
[0003] Existing electrode ablation catheters contain a limited number of electrodes with a simple electrode distribution. This limited electrode configuration severely restricts the electric field distribution and range of action that the catheter can generate upon contact with the lesion, making it impossible to flexibly adjust to the complexities of different lesion areas. Due to the limitations in the number and layout of electrodes, existing catheters can typically only achieve a relatively simple ablation method, lacking diverse operating modes and failing to meet the treatment needs of different lesion conditions in actual clinical use. For example, for some small and precise lesion areas, existing catheters may not be able to achieve highly focused ablation; while for large lesions, it is difficult to form a uniform and continuous ablation effect. For deep tissue lesions, the energy penetration capability of existing catheters is limited, failing to effectively act on deep lesion tissue, resulting in incomplete ablation and a high recurrence rate. Utility Model Content
[0004] The present invention aims to overcome the defects of the prior art and provide an electrode ablation catheter.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an electrode ablation catheter, comprising a catheter body and an adjusting rod. The catheter body includes a pushing section, a first connecting section connected to the pushing section, a first annular section connected to the first connecting section, a second connecting section connected to the first annular section, a second annular section connected to the second connecting section, a third connecting section connected to the second annular section, and a head end section connected to the third connecting section. The head end section has a head end electrode at its end. The second annular section has multiple annular section electrodes. The first annular section has multiple electrode pairs, each electrode pair having two electrodes. The pushing section has a channel portion. The adjusting rod includes a push rod and a U-shaped rod connected to the push rod, the U-shaped rod being able to abut against the second connecting section.
[0006] Furthermore, the ablation catheter is a pulse ablation catheter.
[0007] Furthermore, the first annular segment is an annular ring with an opening.
[0008] Furthermore, the second annular segment is an annular ring with an opening.
[0009] Furthermore, the outer diameter of the first annular segment is larger than the outer diameter of the second annular segment.
[0010] Furthermore, both the push rod and the U-shaped rod contain shape memory alloy; the U-shaped rod is retractable within the channel section.
[0011] Furthermore, the shape memory alloy is nickel-titanium alloy.
[0012] Furthermore, the first connecting segment, the first annular segment, the second connecting segment, the second annular segment, the third connecting segment, and the head end segment all contain shape memory alloy.
[0013] Furthermore, the front end of the push segment comprises a shape memory alloy.
[0014] Furthermore, the shape memory alloy is nickel-titanium alloy.
[0015] Furthermore, the head electrode has an independent connecting wire; each annular segment electrode has an independent wire, and each electrode of the electrode pair has an independent wire.
[0016] This allows each electrode to be controlled independently. Furthermore, the electrode can be adjusted to function as either a cathode or anode when needed.
[0017] Furthermore, the number of the annular segment electrodes is 2-4; the number of electrode pairs is 4-10.
[0018] Furthermore, the head segment is a straight strip.
[0019] Furthermore, temperature sensors are installed at the head end segment, the first annular segment, and the second annular segment.
[0020] Therefore, in each ablation mode, the temperature of the corresponding contact area can be detected.
[0021] Further, the first connecting segment includes a first transition curved segment connected to the pushing segment, a first extended straight segment connected to the first transition curved segment, and a second transition curved segment connecting the first extended straight segment and the first annular segment; the second connecting segment includes a third transition curved segment connected to the first annular segment, a second extended straight segment connected to the third transition curved segment, a fourth transition curved segment connected to the second extended straight segment, a fifth transition curved segment connected to the fourth transition curved segment, and a sixth transition curved segment connecting the fifth transition curved segment and the second annular segment; the third connecting segment includes a seventh transition curved segment connected to the second annular segment, a third extended straight segment connected to the seventh transition curved segment, and an eighth transition curved segment connecting the third extended straight segment and the head end segment.
[0022] Furthermore, the channel extends through the first transition bend section.
[0023] Beneficial effects:
[0024] 1. The electrode ablation catheter of this application has multiple electrodes and can realize ablation in multiple modes, thereby meeting the ablation needs of complex scenarios.
[0025] 2. The ablation catheter of this application has an adjustment rod, which allows for slight adjustment of the position of the second annular segment as needed, thereby increasing the flexibility of the catheter during operation, enabling better contact between the electrode and the affected area, and improving the accuracy and effectiveness of ablation. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the ablation catheter from the first perspective.
[0027] Figure 2 This is a magnified view of region A;
[0028] Figure 3 This is a magnified view of region B.
[0029] Figure 4 This is a schematic diagram of the second perspective of the ablation catheter;
[0030] Figure 5 This is a magnified view of region C;
[0031] Figure 6 This is a magnified view of region D.
[0032] Explanation of reference numerals in the attached drawings: Push section 1; Channel section 1.1; First connecting section 2; First transition bend section 2.1; First extended straight section 2.2; Second transition bend section 2.3; First annular section 3; Electrode pair 3.1; Second connecting section 4; Third transition bend section 4.1; Second extended straight section 4.2; Fourth transition bend section 4.3; Fifth transition bend section 4.4; Sixth transition bend section 4.5; Second annular section 5; Annular section electrode 5.1; Third connecting section 6; Seventh transition bend section 6.1; Third extended straight section 6.2; Eighth transition bend section 6.3; Head end section 7; Head end electrode 7.1; Push rod 8; U-shaped rod 9. Detailed Implementation
[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0034] This utility model provides an electrode ablation catheter as shown in the figure, including a catheter body and an adjusting rod. The catheter body includes a push section 1, a first connecting section 2 connected to the push section 1, a first annular section 3 connected to the first connecting section 2, a second connecting section 4 connected to the first annular section 3, a second annular section 5 connected to the second connecting section 4, a third connecting section 6 connected to the second annular section 5, and a tip section 7 connected to the third connecting section 6. The tip section 7 has a tip electrode 7.1 at its end. The second annular section 5 has multiple annular section electrodes 5.1. The first annular section 3 has multiple electrode pairs 3.1, each electrode pair 3.1 having two electrodes. The push section 1 has a channel portion 1.1. The adjusting rod includes a push rod 8 and a U-shaped rod 9 connected to the push rod 8. The U-shaped rod 9 can abut against the second connecting section 4.
[0035] Both the push rod 8 and the U-shaped rod 9 contain shape memory alloy; the U-shaped rod 9 can retract into the channel portion 1.1. The first connecting segment 2, the first annular segment 3, the second connecting segment 4, the second annular segment 5, the third connecting segment 6, and the head end segment 7 all contain shape memory alloy. The head end electrode 7.1 has an independent connecting wire; each annular segment electrode 5.1 has an independent wire, and each electrode in the electrode pair 3.1 has an independent wire. The number of annular segment electrodes 5.1 is 2-4; the number of electrode pairs 3.1 is 4-10. The head end segment 7 is a straight strip.
[0036] Working principle: The ablation catheter of this application has a tip section, a first annular section, and a second annular section. The outer diameter of the first annular section is larger than that of the second annular section. The tip section has a tip electrode, the first annular section has multiple electrode pairs, each electrode pair having two electrodes, and the second annular section has multiple annular segment electrodes. Therefore, due to the more complex shape of the catheter body, it can contact different areas of the affected site as needed, and the multiple electrodes at different positions can achieve different ablation modes.
[0037] Specifically, it can realize a localized directional ablation mode (high-precision mode), using the head electrode as the cathode and multiple annular segment electrodes as the anode. Multiple electrode pairs are not used, thereby forming a highly focused and concentrated electric field. The energy is mainly concentrated between the head segment and the second annular segment, thus enabling precise ablation of specific small areas.
[0038] It can also perform large-area ring / linear ablation modes (high-efficiency mode). Neither the tip electrode nor the ring segment electrode is applicable; only multiple electrode pairs are used to generate an electric field covering a large area, which can form continuous ring or linear ablation of lesions. These electrode pairs can be driven with alternating polarities to ensure the uniformity of the electric field and the ablation effect.
[0039] In some special cases, a head electrode can be used in conjunction with multiple electrode pairs, with the head electrode acting as the cathode, one of the electrode pairs acting as the anode, and the other electrode left unused. The annular segment electrode is also left unused, thereby creating a converging electric field between the head electrode and the multiple anodes. This electric field can provide deeper tissue penetration and allows for a certain degree of customization of the electric field shape.
[0040] Furthermore, the ablation catheter of this application also has an adjustment rod, which can be pushed forward as needed, thereby using the U-shaped rod to push the second connecting section forward, thereby pushing the second annular section forward as a whole, and thus slightly adjusting the position of the second annular section.
[0041] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.
Claims
1. An electrode ablation catheter, characterized in that, The catheter includes a catheter body and an adjusting rod. The catheter body includes a push section, a first connecting section connected to the push section, a first annular section connected to the first connecting section, a second connecting section connected to the first annular section, a second annular section connected to the second connecting section, a third connecting section connected to the second annular section, and a tip section connected to the third connecting section. The tip section has a tip electrode at its end. The second annular section has multiple annular section electrodes. The first annular section has multiple electrode pairs, each electrode pair having two electrodes. The push section has a channel portion. The adjusting rod includes a push rod and a U-shaped rod connected to the push rod. The U-shaped rod can abut against the second connecting section.
2. The electrode ablation catheter according to claim 1, characterized in that, Both the push rod and the U-shaped rod contain shape memory alloy; the U-shaped rod can retract into the channel section.
3. The electrode ablation catheter according to claim 1, characterized in that, The first connecting segment, the first annular segment, the second connecting segment, the second annular segment, the third connecting segment, and the head end segment all contain shape memory alloy.
4. The electrode ablation catheter according to claim 1, characterized in that, The head electrode has an independent connecting wire; each annular segment electrode has an independent wire, and each electrode of the electrode pair has an independent wire.
5. The electrode ablation catheter according to claim 1, characterized in that, The number of the annular segment electrodes is 2-4; the number of electrode pairs is 4-10.
6. The electrode ablation catheter according to claim 1, characterized in that, The head section is a straight strip.