An ablation catheter based on an adjustable electrode arm
By designing an ablation catheter with adjustable electrode arms, the problems of insufficient ablation range and precision of existing ablation catheters have been solved, achieving ablation of a larger range and single-point precision, and improving the flexibility and accuracy 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
- 2025-08-15
- Publication Date
- 2026-07-03
Smart Images
Figure CN224441440U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ablation catheters, and more specifically, to an ablation catheter based on an adjustable electrode arm. Background Technology
[0002] An ablation catheter is a minimally invasive interventional medical device used to treat cardiac arrhythmias. It is inserted into the heart through a blood vessel puncture, and the catheter tip is equipped with an ablation head that can release energy (such as radiofrequency current, pulsed electric field), or cryotherapy. Radiofrequency ablation catheters or pulsed ablation catheters are common ablation catheters. After the distal end of the ablation catheter is inserted into the heart to reach the corresponding treatment target location, an electrode is delivered distally. Once the electrode is in contact with the tissue, energy is transferred to the tissue to ablate it.
[0003] Some existing ablation catheters only have electrodes at the tip, which sometimes results in insufficient ablation range, low efficiency, and poor ablation effects. Other ablation catheters have multiple electrode arms, each with multiple electrodes, which, while providing a large ablation range, make precise single-point ablation difficult. Furthermore, existing electrode arms lack fine-tuning capabilities. In some applications, the limited adjustment freedom of the electrode arms makes it difficult to achieve stable and ideal electrode contact in certain areas, leading to poor ablation results. Utility Model Content
[0004] The present invention aims to overcome the defects of the prior art and provide an ablation catheter based on an adjustable electrode arm.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an ablation catheter, comprising an outer tube, an inner tube, a head end block fixedly connected to the distal end of the inner tube, an annular surrounding plate fixedly connected to the head end block, and multiple electrode arms. The proximal end of each electrode arm is fixedly connected to the distal end of the outer tube, and a slider is fixedly connected to the distal end of each electrode arm. An elastic pull rope is connected between the slider and the head end block, and a pull wire is connected to the slider. The outer wall of the inner tube has multiple strip-shaped limiting slide rails, and the slider cooperates with the strip-shaped limiting slide rails to slide along the strip-shaped limiting slide rails. The strip-shaped limiting slide rails have strip-shaped channels that can accommodate the pull wire. Multiple electrode arms are provided at each electrode arm.
[0006] Furthermore, the number of electrode arms and the limiting slide rails are equal and they correspond one-to-one.
[0007] Furthermore, the ablation catheter is a radiofrequency ablation catheter or a pulse ablation catheter.
[0008] Furthermore, the number of electrode arms is 4-8, and they are distributed in a ring with equal spacing.
[0009] This ensures that the ablation range is evenly distributed around the catheter, making the ablation area controllable.
[0010] Furthermore, each electrode arm has 2-4 electrode arm electrodes.
[0011] Therefore, it can be used for multi-point ablation.
[0012] Furthermore, the strip-shaped limiting slide rail has strip-shaped grooves on both sides, and the slider has two protrusions that cooperate with the strip-shaped grooves.
[0013] This makes the slider's movement more stable and prevents lateral deviation.
[0014] Furthermore, the head end block has a head end electrode.
[0015] In some embodiments, the head electrode is divided into two parts: an active electrode and a return electrode.
[0016] In some embodiments, there is one head electrode, and the head electrode and the electrode arm electrode are used together.
[0017] Furthermore, the outer tube includes an outer tube body and an outer tube end block fixed to the distal end of the outer tube body, and the proximal end of the electrode arm is fixedly connected to the outer tube end block.
[0018] Furthermore, the outer tube is made of polyether block amide or polyether ether ketone material.
[0019] This gives it good flexibility.
[0020] Furthermore, both the electrode arm electrode and the head electrode are made of platinum-iridium alloy, or are made of gold-plated material.
[0021] Furthermore, the electrode arm includes a shape memory alloy support and an insulating layer covering the shape memory alloy support.
[0022] Furthermore, the shape memory alloy is nickel-titanium alloy.
[0023] Furthermore, the insulating layer is a polyimide insulating layer.
[0024] Furthermore, a temperature sensor is installed at the head end block and at each electrode arm.
[0025] This allows for real-time monitoring of the ablation zone temperature, preventing overheating and carbonization.
[0026] Beneficial effects:
[0027] 1. The ablation catheter of this application has an electrode arm electrode that allows for a larger effective range; and a tip electrode that enables precise single-point ablation.
[0028] 2. In the ablation catheter of this application, when the tip electrode and the electrode arm electrode are paired and activated, an inclined or focused electric field can be formed to precisely target a specific area.
[0029] 3. In the ablation catheter of this application, each electrode arm can be individually fine-tuned, thus making the adjustment of the electrode arms more flexible. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the ablation catheter from the first perspective.
[0031] Figure 2 This is a schematic diagram of area A;
[0032] Figure 3 This is a schematic diagram of region B;
[0033] Figure 4 This is a schematic diagram of the second perspective of the ablation catheter;
[0034] Figure 5 This is a schematic diagram of region C;
[0035] Figure 6 This is a schematic diagram of the ablation catheter from a third-angle perspective.
[0036] Explanation of reference numerals in the attached drawings: outer tube 1; outer tube body 1.1; outer tube end block 1.2; inner tube 2; strip-shaped limiting slide rail 2.1; strip-shaped channel 2.2; strip-shaped groove 2.3; head end block 3; head end electrode 3.1; annular surrounding plate 4; electrode arm 5; electrode arm electrode 5.1; slider 6; protrusion 6.1; elastic pull rope 7; pull line 8. Detailed Implementation
[0037] 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.
[0038] This utility model provides an ablation catheter based on adjustable electrode arms, as shown in the figure. It includes an outer tube 1, an inner tube 2, a head end block 3 fixedly connected to the distal end of the inner tube 2, an annular surrounding plate 4 fixedly connected to the head end block 3, and multiple electrode arms 5. The proximal end of each electrode arm 5 is fixedly connected to the distal end of the outer tube 1. A slider 6 is fixedly connected to the distal end of each electrode arm 5. An elastic pull rope 7 connects the slider 6 to the head end block 3. A pull wire 8 is connected to the slider 6. The outer wall of the inner tube 2 has multiple strip-shaped limiting slide rails 2.1. The slider 6 cooperates with the strip-shaped limiting slide rails 2.1 to slide along the strip-shaped limiting slide rails 2.1. The strip-shaped limiting slide rails 2.1 have strip-shaped channels 2.2 capable of accommodating the pull wire 8. Multiple electrode arm electrodes 5.1 are located at each electrode arm 5.
[0039] The number of electrode arms 5 is 4-8, and they are distributed in a ring with equal spacing. Each electrode arm 5 has 2-4 electrode arm electrodes 5.1. The strip-shaped limiting slide rail 2.1 has strip-shaped grooves 2.3 on both sides, and the slider 6 has two protrusions 6.1 that mate with the strip-shaped grooves 2.3. The head end block 3 has a head end electrode 3.1. The outer tube 1 includes an outer tube body 1.1 and an outer tube end block 1.2 fixed to the distal end of the outer tube body. The proximal end of the electrode arm 5 is fixedly connected to the outer tube end block 1.2. The outer tube 1 is made of polyether block amide or polyether ether ketone. The electrode arm electrodes 5.1 and the head end electrodes 3.1 are both made of platinum-iridium alloy, or both are made of gold-plated material. The electrode arm 5 includes a shape memory alloy support and an insulating layer covering the shape memory alloy support. A temperature sensor is installed at the head end block 3 and each electrode arm 5.
[0040] Working principle: The ablation catheter of this application has an electrode arm electrode that allows for a larger effective range; the tip electrode of the electrode pair enables precise single-point ablation. Furthermore, in the pulse ablation catheter, when the tip electrode and electrode arm electrodes are paired and activated, an inclined or focused electric field can be formed to precisely target specific areas.
[0041] In practice, after the inner tube extends from the outer tube, pulling the inner tube backward causes multiple electrode arms to bend into a petal shape, allowing for ablation of the pulmonary vein opening. Each electrode arm can be individually controlled by a pull wire; by pulling the slider proximally, the bending degree of that electrode arm can be adjusted independently. For example, in actual operation, pulling the inner tube backward can achieve synchronous bending of multiple electrode arms. For localized fine-tuning, a single pull wire can be pulled, allowing the corresponding electrode arm to bend more significantly, thus enabling individual fine-tuning of the electrode arm.
[0042] 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 ablation catheter based on an adjustable electrode arm, characterized in that, The device includes an outer tube, an inner tube, a head end block fixedly connected to the distal end of the inner tube, an annular surrounding plate fixedly connected to the head end block, and multiple electrode arms. The proximal end of each electrode arm is fixedly connected to the distal end of the outer tube, and a slider is fixedly connected to the distal end of each electrode arm. An elastic pull rope is connected between the slider and the head end block, and a pull wire is connected to the slider. The outer wall of the inner tube has multiple strip-shaped limiting slide rails, and the slider cooperates with the strip-shaped limiting slide rails to slide along them. The strip-shaped limiting slide rails have strip-shaped channels that can accommodate the pull wire. Each electrode arm has multiple electrode arm electrodes.
2. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The number of electrode arms is 4-8, and they are distributed in a ring with equal spacing.
3. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, Each electrode arm has 2-4 electrode arms.
4. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The strip-shaped limiting slide rail has strip-shaped grooves on both sides, and the slider has two protrusions that mate with the strip-shaped grooves.
5. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The head end block has a head end electrode.
6. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The outer tube includes an outer tube body and an outer tube end block fixed to the distal end of the outer tube body, and the proximal end of the electrode arm is fixedly connected to the outer tube end block.
7. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The outer tube is made of polyether block amide or polyether ether ketone.
8. The ablation catheter based on an adjustable electrode arm of claim 5, characterized in that, Both the electrode arm electrode and the head electrode are made of platinum-iridium alloy, or both are made of gold-plated material.
9. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, The electrode arm includes a shape memory alloy support and an insulating layer covering the shape memory alloy support.
10. The ablation catheter based on an adjustable electrode arm of claim 1, characterized in that, Temperature sensors are installed at the head end block and at each electrode arm.