Epicardial ablation catheter with half-surface ablation electrode and turtle-back-shaped capsule body

Abstract

The invention belongs to the field of medical instruments, and particularly relates to an epicardium ablation catheter with a half-face ablation electrode and a turtle-back-shaped bag body. The invention provides an epicardial ablation catheter with a half-face ablation electrode and a turtle-back-shaped bag body. The epicardial ablation catheter comprises a catheter body provided with an inflation channel. A turtle-back-shaped bag body is formed by a concave face and a convex face, the concave face of the bag body is fixed to the side wall of the far end of the catheter, and the bag body is communicated with the inflation channel. The semi-ring electrodes are arranged on the side wall of the far end of the catheter, and the semi-ring electrodes are located on the concave face side of the bag body. When the epicardium ablation catheter with the half-face ablation electrode and the turtle-back-shaped bag body is used, the bag body expands to generate certain pressure on the half-ring electrode, so that the half-ring electrode is attached to and tightly pressed against a myocardial side point position needing to be ablated, the energy density is improved, and the ablation efficiency is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to an epicardial ablation catheter having a half-sided ablation electrode and a turtle-back shaped capsule. Background Technology

[0002] Complex arrhythmias are a class of cardiovascular diseases that seriously threaten human life and health. Their pathogenesis is complex, and the disease progresses rapidly, often leading to serious consequences such as palpitations, syncope, and even sudden death, posing a significant challenge to clinical diagnosis and treatment. Among numerous treatment methods, epicardial ablation, with its precise targeting of complex lesions, has become a crucial core technology for treating complex arrhythmias, providing a new treatment option for many patients who do not respond well to conventional treatments.

[0003] However, current clinical applications of traditional epicardial ablation techniques still face significant technical bottlenecks, the most critical being the unsatisfactory transmural ablation effect. Transmural ablation is one of the core indicators for evaluating the success of ablation therapy; only by achieving complete transmural ablation of the lesion area can the conduction pathway of abnormal electrical signals be completely blocked, thus achieving the goal of radically curing arrhythmias. When performing epicardial ablation using traditional electrode catheters, limitations imposed by catheter structural design, energy transfer efficiency, and the epicardial tissue environment make it difficult to stably and effectively create ablation lesions penetrating the entire myocardial layer, resulting in a transmural rate of less than 70% and incomplete ablation.

[0004] This insufficient transmural ablation rate directly impacts clinical treatment outcomes, leading not only to a persistently high recurrence rate of arrhythmias but also potentially increasing the risk of repeat surgery, thus exacerbating the physical and psychological burden on patients and increasing medical costs. Therefore, optimizing the structure or improving the function of existing electrode catheters to enhance their transmural performance for epicardial ablation and overcome the limitations of traditional techniques has become a critical technical issue urgently needing resolution in the field of cardiovascular interventional therapy. This has significant clinical implications and application value for promoting the development of treatment techniques for complex arrhythmias and improving patient prognosis. Summary of the Invention

[0005] The epicardial ablation catheter with a half-sided ablation electrode and a turtle-back shaped cyst provided by the present invention can effectively solve the problems in the background art.

[0006] The epicardial ablation catheter provided by this invention, comprising a half-sided ablation electrode and a turtle-back shaped capsule, includes:

[0007] A conduit equipped with an inflation channel;

[0008] The capsule is formed by concave and convex surfaces, creating a turtle-back shape. The concave surface of the capsule is fixed to the side wall at the distal end of the duct, and the capsule is connected to the inflation channel.

[0009] Additionally, several semi-circular electrodes are disposed on the distal sidewall of the catheter, with the semi-circular electrodes located on the concave side of the cyst body.

[0010] As a further optimization of the present invention, the concave surface of the capsule is provided with a strip-shaped notch that is adapted to the outer arc surface of the catheter, the catheter is disposed in the strip-shaped notch, and the semi-ring electrode and the strip-shaped notch form a complete ring that covers the catheter.

[0011] As a further optimization of the present invention, the convex surface is spherical and the concave surface is arc-shaped.

[0012] As a further optimization of the present invention, several annular electrodes are provided on the sidewall of the catheter in front of the capsule.

[0013] As a further optimization of the present invention, two semi-ring electrodes are provided.

[0014] As a further optimization of the present invention, the catheter is provided with a guidewire channel; it also includes a guidewire disposed within the guidewire channel.

[0015] As a further optimization of the present invention, it also includes a handle located at the proximal end of the catheter that allows for bidirectional bending of the guidewire. The handle is provided with an inflation port communicating with the inflation channel, a guidewire inlet communicating with the guidewire channel, and a cable connector communicating with the semi-circular electrode.

[0016] As a further optimization of the present invention, the handle includes:

[0017] The handle is hollow, and the inner wall of the handle is provided with an annular groove and a strip groove arranged along the length direction;

[0018] The hollow rotating part has one end connected to the proximal end of the conduit, and the other end of the rotating part is inserted into the hand-held part. The side wall of the rotating part is provided with a protrusion that matches the annular groove, and the inner wall of the other end of the rotating part is provided with an internal thread.

[0019] In addition, a screw adapted to the internal thread, one end of which is connected to the proximal end of the guide wire, and the other end of which is provided with a limiting part for inserting into the strip groove.

[0020] As a further optimization of the present invention, the outer wall of the rotating part not inserted into the handgrip is provided with anti-slip texture.

[0021] As a further optimization of the present invention, the capsule is made of a highly elastic memory polymer.

[0022] The epicardial ablation catheter provided by this invention has a half-face ablation electrode and a turtle-back shaped sac. When in use, the expansion of the sac will generate a certain pressure on the half-circular electrode, so that the half-circular electrode fits and presses against the myocardial side point to be ablated, thereby focusing the energy, increasing the energy density, and significantly improving the permeability of the ablation, thus improving the ablation efficiency.

[0023] The turtle-back shaped balloon used in this invention allows for precise attachment of the balloon portion to the epicardial surface during ablation catheter positioning, while the electrode portion is oriented to the myocardial wall. This structural design effectively blocks the diffusion of ablation energy into the epicardium, avoiding unintended damage to the epicardium caused by traditional circular electrode ablation.

[0024] The turtle-back shaped balloon used in this invention applies moderate pressure to the myocardial wall, which not only ensures close contact between the electrode and the myocardial tissue, but also concentrates the ablation energy in the target myocardial region, thereby significantly improving ablation efficiency and effectiveness, while reducing energy loss and impact on surrounding non-target tissues.

[0025] This innovative design achieves the dual goals of precise ablation of the myocardial wall and effective protection of the epicardium through the synergistic effect of physical isolation and mechanical regulation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0027] Figure 2 yes Figure 1 Schematic diagram of the middle cyst structure;

[0028] Figure 3 yes Figure 2 Another perspective structural diagram;

[0029] Figure 4 yes Figure 1 Schematic diagram of the semi-ring electrode structure;

[0030] Figure 5 yes Figure 1 A schematic diagram of the structure after the handle is installed;

[0031] Figure 6 yes Figure 5 A schematic diagram of the cross-sectional structure of the handle;

[0032] The components include: catheter 1, capsule 2, convex surface 2a, concave surface 2b, strip notch 2c, semi-ring electrode 3, handle 4, handheld part 4a, annular groove 4a1, strip groove 4a2, rotating part 4b, annular protrusion 4b1, internal thread 4b2, inflation port 5, guide wire inlet 6, cable connector 7, annular electrode 8, and guide wire 9. Detailed Implementation

[0033] like Figure 1-6 As shown, this embodiment includes a catheter 1, a capsule 2, and a semi-circular electrode 3.

[0034] The conduit 1 has a hollow structure and a separate inflation channel is provided inside the conduit 1. In this embodiment, the wall thickness of the conduit 1 is used to open a separate inflation channel in its wall. One end of the inflation channel is opened from the side wall at the far end of the conduit 1 and communicates with the outside. The other end of the inflation channel is connected to the inflation device at the proximal end of the conduit 1.

[0035] The bladder 2 is an air bladder located on the side wall at the distal end of the conduit 1. The bladder 2 is connected to the inflation channel, and the inflation device can inflate the bladder 2 through the inflation channel.

[0036] When the capsule 2 is filled with air, it takes the shape of a turtle's back, specifically including a convex surface 2a in the shape of a spherical crown and a concave surface 2b in the shape of an arc corresponding to the convex surface 2a. The concave surface 2b has a strip-shaped notch 2c along the direction of the duct 1. The shape of the strip-shaped notch 2c corresponds to the outer arc surface of the duct 1, so that half of the arc surface of the duct 1 can be just right to fit into the strip-shaped notch 2c.

[0037] Preferably, the capsule 2 is made of a highly elastic memory polymer, including but not limited to thermoplastic polyurethane. This material will not damage the organ, has the function of returning to its original shape after being inflated, and has a limited expansion volume.

[0038] The semi-circular electrode 3 is a semi-circular shape corresponding to the arc surface of the catheter 1. The semi-circular electrode 3 is located on the side wall at the distal end of the catheter 1. The semi-circular electrode 3 is located exactly at the concave surface 2b of the capsule 2. The semi-circular electrode 3 and the strip-shaped notch 2c form a complete ring that surrounds the catheter 1.

[0039] During use, the semi-circular electrode 3 is moved to the myocardium side to be ablated by operating the catheter 1, and then the capsule 2 is inflated. The capsule 2 expands and expands, so that the convex surface 2a maintains at least three points of contact with the epicardium, namely the anterior, middle and posterior parts. This increases the friction with the contact surface and greatly improves the adhesion. Even if the heart is beating, the catheter 1 will not be displaced, and the positioning is accurate and stable.

[0040] The expansion of the capsule 2 also exerts a certain pressure on the semi-circular electrode 3, causing the semi-circular electrode 3 to adhere to and press firmly against the myocardial side point that needs to be ablated, thereby focusing the energy, increasing the energy density, and significantly improving the permeability of the ablation, thus improving the ablation efficiency.

[0041] In this embodiment, two semi-circular electrodes 3 are provided. When the heart beats, causing a change in the curvature of the myocardium, the catheter 1 between the two semi-circular electrodes 3 can change its curvature in accordance with the change in myocardial curvature under the action of the capsule 2, so that the two semi-circular electrodes 3 are always positioned at the point to be ablated as the curvature of the myocardium changes, and the positioning is stable.

[0042] Of course, in other embodiments, the semi-ring electrode 3 may be provided in one, three or other quantities, depending on the circumstances.

[0043] Furthermore, traditional ring electrodes 8, which do not target the area of ​​the myocardium requiring ablation, are prone to thermal damage to adjacent blood vessels, nerves, or healthy myocardium, potentially leading to complications. This embodiment avoids these problems. The semi-ring electrodes 3 used in this embodiment cover the effective area, eliminating any useless area that comes into contact with adjacent blood vessels, nerves, or healthy myocardium.

[0044] Furthermore, in this embodiment, a guidewire channel is provided inside the catheter 1, and a guidewire 9 is also provided. The guidewire 9 is located inside the guidewire channel, and the bending operation can be achieved by controlling the guidewire 9.

[0045] Furthermore, a handle 4 is provided, which can bend the guide wire 9 in both directions. The handle 4 is located at the proximal end of the conduit 1, and the handle 4 is provided with an inflation port 5, a guide wire inlet 6, and a cable connector 7.

[0046] The inflation port 5 is connected to the inflation channel and is used to connect to the inflation device. The inflation device injects gas into the inflation channel through the inflation port 5.

[0047] The guide wire inlet 6 is used to insert the guide wire 9 from the handle 4 into the guide wire channel.

[0048] The cable connector 7 is connected to the semi-ring electrode 3 via a cable, and the power supply is provided to the semi-ring electrode 3 through the cable connector 7 to achieve the ablation function.

[0049] Specifically, in this embodiment, the handle 4 includes a hand-held part 4a, a rotating part 4b, and a screw. Both the hand-held part 4a and the rotating part 4b are cylindrical in shape.

[0050] The inner wall of the hand-held part 4a has an annular groove 4a1 in the circumferential direction and a strip groove 4a2 in the length direction, i.e., in the axial direction.

[0051] One end of the rotating part 4b is connected to the proximal end of the conduit 1, and the other end of the rotating part 4b is inserted into the hand-held part 4a. The side wall of this end is provided with an annular protrusion 4b1 that matches the annular groove 4a1. The annular protrusion 4b1 is located in the annular groove 4a1, which allows the rotating part 4b to rotate relative to the hand-held part 4a about its axis, but not to move in the length direction relative to the hand-held part 4a.

[0052] The inner wall of the other end of the rotating part 4b is also provided with an internal thread 4b2.

[0053] The screw is adapted to and meshes with the internal thread 4b2. One end of the screw is connected to the proximal end of the guide wire 9, and the other end of the screw is provided with a limiting part for inserting into the strip groove 4a2.

[0054] With this structure, by holding the hand part 4a, the rotating part 4b can be rotated using the thumb. The rotation of the rotating part 4b can drive the screw to move back and forth along the length direction, thereby pulling the guide wire 9 to move back and forth relative to the catheter 1, realizing the bidirectional bending function.

[0055] While pushing the catheter 1 forward, the distal end of the catheter 1 swings left and right by pulling the proximal end of the guidewire 9, causing the catheter 1 to move in the bending direction. The side wall of the rotating part 4b not inserted into the handle part 4a is provided with anti-slip texture.

[0056] Furthermore, in this embodiment, several annular electrodes 8 are provided at a position further forward of the catheter 1 and the capsule 2.

[0057] It should be understood that the descriptions of directions or positional relationships such as up, down, left, right, front, back, top, bottom, tail, horizontal, and vertical in this application are all based on the accompanying drawings in the specification and are only used to more clearly express the technical solution and simplify the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An epicardial ablation catheter having a half-sided ablation electrode and a turtle-back shaped capsule, characterized in that, include: A conduit equipped with an inflation channel; The capsule is formed by concave and convex surfaces, creating a turtle-back shape. The concave surface of the capsule is fixed to the side wall at the distal end of the duct, and the capsule is connected to the inflation channel. Additionally, several semi-circular electrodes are disposed on the distal sidewall of the catheter, with the semi-circular electrodes located on the concave side of the cyst body.

2. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, The concave surface of the capsule has a strip-shaped notch that matches the outer arc surface of the catheter. The catheter is placed inside the strip-shaped notch, and the semi-circular electrode and the strip-shaped notch form a complete ring that surrounds the catheter.

3. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, The convex surface is spherical, and the concave surface is arc-shaped.

4. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, Several annular electrodes are provided on the side wall of the catheter at the front of the capsule.

5. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, There are two semi-circular electrodes.

6. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, The catheter has a guidewire channel; it also includes a guidewire located within the guidewire channel.

7. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 6, characterized in that, It also includes a handle located at the proximal end of the catheter that allows for bidirectional bending of the guidewire. The handle has an inflation port that communicates with the inflation channel, a guidewire inlet that communicates with the guidewire channel, and a cable connector that communicates with the semi-circular electrode.

8. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 7, characterized in that, The handle includes: The handle is hollow, and the inner wall of the handle is provided with an annular groove and a strip groove arranged along the length direction; The hollow rotating part has one end connected to the proximal end of the conduit, and the other end of the rotating part is inserted into the hand-held part. The side wall of the rotating part is provided with a protrusion that matches the annular groove, and the inner wall of the other end of the rotating part is provided with an internal thread. In addition, a screw adapted to the internal thread, one end of which is connected to the proximal end of the guide wire, and the other end of which is provided with a limiting part for inserting into the strip groove.

9. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 7, characterized in that, The outer wall of the rotating part, which is not inserted into the handle, is provided with anti-slip texture.

10. The epicardial ablation catheter with a half-face ablation electrode and a turtle-back shaped capsule according to claim 1, characterized in that, The capsule is made of a highly elastic memory polymer.

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