Electrophysiology mapping catheter

Abstract

The electrophysiology mapping catheter comprises a catheter body and a plurality of electrode branches arranged at the far end of the catheter body, the electrode branches are arranged in the circumferential direction of the catheter body, and the electrode branches extend in the direction away from the catheter body from the positions connected with the catheter body; each electrode branch comprises a curved first bent part, and the first bent parts are located at the positions, farthest from the catheter, of the electrode branches. And after being combined with the adjacent ring electrode signal, mapping with larger area and higher precision can be realized.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to an electrophysiological mapping catheter. Background Art

[0002] In the field of electrophysiology catheters, mapping catheters are typically used to stimulate and map electrical activity in the ventricles, atria, and atrial septum, generating mapping maps from the collected electrical signals. Currently available monopolar or claw-shaped mapping catheters have either a small active area (single-electrode mapping) or a common problem where the tip easily contacts the endocardial tissue, leading to premature beats and impacting intraoperative diagnosis and treatment. Therefore, a design with large, high-density, excellent, and stable signal transmission, coupled with soft contact points, is crucial for reducing the incidence of premature beats and enabling immediate diagnosis and treatment during surgery. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the present application provides an electrophysiological mapping catheter.

[0004] The specific technical solutions of this application are as follows:

[0005] An electrophysiological mapping catheter, comprising a tube body and an electrode branch disposed at a distal end of the tube body, wherein a plurality of the electrode branches are disposed along the circumference of the tube body, and the electrode branches extend from a position connected to the tube body toward a direction away from the tube body;

[0006] The electrode branch includes a first curved portion, which is located near the distal end of the electrode branch.

[0007] In a specific embodiment, the first bend is located at a position where the electrode branch is farthest from the catheter.

[0008] In a specific embodiment, the first curved portion is bent in a plane close to a vertical plane of the tube body.

[0009] In a specific embodiment, the electrode branch includes a second curved portion, the second curved portion is located at a position of the electrode branch close to the tube body, and the second curved portion is in a curved shape that bends in a direction away from the central axis of the catheter.

[0010] In a specific embodiment, both ends of the electrode branch extend from the first bend toward the tube body.

[0011] In a specific embodiment, the tube body is a hollow structure, a pull rod is slidably connected inside the tube body, one end of the electrode branch is fixed to the distal end of the pull rod; and the end of the electrode branch away from the pull rod is fixed to the tube body.

[0012] In a specific embodiment, when the distal end of the pull rod moves closer to the distal end of the tube body, the electrode branch bends in a ring shape in the radial direction of the tube body.

[0013] In a specific embodiment, the plane where the ring formed by the electrode branches is located tends to be a plane perpendicular to the pull rod.

[0014] In a specific embodiment, the end of the electrode branch away from the tube body is a free end.

[0015] In a specific embodiment, the free end of the electrode branch extends toward the tube body; and the electrode branch is ring-shaped.

[0016] In a specific embodiment, a ring electrode that can be used for mapping is provided on the electrode branch.

[0017] Beneficial effects

[0018] The electrophysiological mapping catheter of the present application travels in the sheath in a bundle-like structure during transportation. After reaching the designated heart area, the electrode branches are unfolded into petal shapes by pulling the pull rod (if any) set in the middle or by naturally unfolding the memory skeleton fixed in the electrode branch. Ring electrodes are attached to the petal trajectory to provide higher density signal transmission under the same operation time. The unfolded structure can be placed in the heart in a structural style of at least two petals or four petals. The maximum extension of a single petal after unfolding is an arc structure; the head end of the arc extension design can achieve better contact with the contact method of a single catheter, and better reduce the probability of premature beats. A plurality of ring electrodes for mapping tiny electrical signals are set on the petal structure of each electrode branch, and each petal-shaped electrode branch is relatively independent, equivalent to a single independent ring electrode. After combining with the adjacent ring electrode signals, a larger area and higher precision mapping can be achieved; after unfolding, the branches are fixed and the head ends are connected to compensate for the disadvantages of premature beats in unipolar mapping or star-shaped mapping catheters.

[0019] The maximum extended arc-shaped structure of the electrode branch petals in the present application, i.e., the distal end of the electrode branch contacts the inner wall of the heart. When the catheter in the present application is used for mapping, the electrode branch contacts the inner wall of the heart smoothly while ensuring the adhesion effect, which can effectively reduce the occurrence of premature beats. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the catheter structure of this application;

[0021] Figure 2 This is a partially enlarged schematic diagram of the catheter of the present application;

[0022] Figure 3 This is a schematic diagram of the catheter structure of another embodiment of the present application.

[0023] In the figure, 1, tube body; 2, electrode branch; 3, first bend; 4, second bend; 5, ring electrode; 6, pull rod; 7, tissue. DETAILED DESCRIPTION

[0024] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0025] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of this application shall be as defined by the attached claims.

[0026] In the field of interventional medicine, the end closest to the operator is defined as the "proximal end," and the end away from the operator is defined as the "distal end." For elongated objects, the direction parallel to their length is defined as the "axial direction." For objects with a circular cross-section, the direction surrounding their axis is defined as the "circumferential direction." For cylindrical objects, the direction of their extension is defined as the "axial direction," and the direction of the circular cross-section's radius is defined as the "radial direction."

[0027] refer to Figure 1 The present application provides an electrophysiological mapping catheter, comprising a tube body 1 and an electrode branch 2 disposed at the distal end of the tube body 1 . The electrode branch 2 is provided in plurality along the circumference of the tube body 1 , and the electrode branch 2 extends from a position connected to the tube body 1 toward a direction away from the tube body 1 .

[0028] refer to Figure 1 The electrophysiological mapping catheter in this application is used to map human tissue 7. When using the electrophysiological mapping catheter to map human tissue 7, a sheath and a three-dimensional modeling system are also used. The sheath is inserted deep into the human body to provide an entry channel for the electrophysiological mapping catheter. The three-dimensional modeling system is used to process the mapping signal of the electrophysiological mapping catheter on human tissue 7, and then build a three-dimensional model of the human tissue 7 for accurately locating abnormal lesions in the tissue 7.

[0029] refer to Figure 1 The electrode branch 2 can capture the weak current generated by the human tissue 7 during activity, and then the electrode branch 2 transmits the captured microcurrent signal to the three-dimensional modeling system. The three-dimensional modeling system then constructs an electrophysiological three-dimensional model of the human tissue 7 based on the signal measured by the electrode branch 2, and then uses it to accurately locate the lesion position of the human tissue 7 to assist in subsequent ablation treatment.

[0030] refer to Figure 2 and Figure 3 , multiple electrode branches 2 spread out in a direction away from the tube body 1, so that the electrode branches 2 can extend to a position away from the tube body 1, so that the electrode branches 2 can map a larger range of human tissue 7, thereby improving the mapping speed of the electrode branches 2 on the human body.

[0031] refer to Figure 2 and Figure 3 Multiple electrode branches 2 are provided, and the multiple electrode branches 2 are evenly arranged along the circumference of the tube body 1 and are independent of each other. Therefore, the electrode branches 2 can map the surrounding positions of the distal end of the tube body 1. When mapping human tissue 7, the electrode branches 2 can be moved by moving the tube body 1, thereby facilitating the mapping of the human body by the electrode branches 2.

[0032] refer to Figure 2 and Figure 3 The electrode branch 2 includes a first curved portion 3 , and the first curved portion 3 is located near the distal end of the electrode branch 2 .

[0033] The first bend 3 of the electrode branch is curved, so when the electrode branch 2 is used for mapping, the curved structure can increase the sharpness of the electrode branch 2 at the distal position, thereby reducing the puncture damage of the electrode branch 2 to the human body and further reducing the possibility of premature beats.

[0034] The first curved portion 3 is located at the position where the electrode branch 2 is farthest from the catheter.

[0035] refer to Figure 2 and Figure 3 When the electrode branch 2 is deployed along the tube body 1 in a direction away from the tube body 1, the first curved portion 3 is transported to the farthest position in the deployment direction.

[0036] refer to Figure 1When electrode branch 2 is mapping human tissue 7, it will be in contact with human tissue 7. To achieve perfect contact with tissue 7, the distal end of electrode branch 2 will be in the same plane as the proximal end of electrode branch 2, or the distal end of electrode branch 2 will be in a protruding state relative to the proximal end. When electrode branch 2 is in contact with tissue 7, the distal end of electrode branch 2 will first contact tissue 7, and then the proximal end of electrode branch 2 will cover tissue 7.

[0037] refer to Figure 1 When the distal end of the electrode branch 2 first comes into contact with the tissue 7, only the distal end of the electrode branch 2 comes into contact with the tissue 7. At this time, the contact area between the electrode branch 2 and the tissue 7 is small, and the pressure exerted by the distal end of the electrode branch 2 on the tissue 7 is large. Therefore, the distal position of the electrode branch 2 can easily cause squeezing damage to the tissue 7.

[0038] refer to Figure 1 In the present application, the first bend 3 is positioned at the distal end of the electrode branch 2. Therefore, when the electrode branch 2 contacts the tissue 7, the first bend 3 contacts the tissue 7 first. The curved shape of the first bend 3 conceals the sharp end, thereby significantly reducing the risk of the electrode branch 2 puncturing the tissue 7. Furthermore, the first bend 3 has a larger contact area when contacting the tissue 7, thereby reducing the pressure exerted by the electrode branch 2 on the human tissue 7 and further reducing the possibility of damage to the tissue 7 caused by the electrode branch 2. This further reduces the probability of premature beats.

[0039] It is worth mentioning that when electrode branch 2 is used to map tissue 7, since electrode branch 2 is relatively large in the radial direction of tube body 1, and human tissue 7 is generally wide on the outside and narrow on the inside, such as at the junction of the left atrium and pulmonary veins, when electrode branch 2 is used to map tissue 7, due to the structural characteristics of human tissue 7, the distal end of electrode branch 2 will first contact tissue 7. Then, as tube body 1 continues to advance, electrode branch 2 will undergo corresponding elastic deformation to achieve contact with tissue 7. In order to reduce the possibility of electrode branch 2 puncturing tissue 7, first bend 3 is located at the distal end, so that first bend 3 contacts human tissue 7 first, reducing the possibility of electrode branch 2 puncturing tissue 7. This further reduces the probability of premature beats.

[0040] Compared to conventional electrophysiological mapping catheters in the art, the distal tip of the electrode branch 2 is located at the most distal position. Therefore, when placed against human tissue 7, the distal tip of a conventional electrophysiological mapping catheter can easily injure the tissue 7. However, the first curved portion 3 in the present application, due to its arcuate structure, conceals the more pointed tip, thereby significantly reducing the possibility of injuring the tissue 7.

[0041] refer to Figure 2 and Figure 3 A ring electrode 5 that can be used for mapping is provided on the electrode branch 2.

[0042] The ring electrode 5 is mounted on the electrode branch 2. The ring electrode 5 can capture the microcurrent generated by the electrophysiological characteristics of the human tissue 7. The ring electrode 5 then transmits the measured microcurrent signal to the three-dimensional modeling system. The three-dimensional modeling system then uses the electrical signal measured by the ring electrode on the electrode branch 2 to model the three-dimensional structure of the tissue 7. Based on the microcurrent signal measured by the ring electrode 5, a three-dimensional mapped model of the human tissue 7 with electrophysiological characteristics is constructed. The user can then determine the target location of the human tissue 7 for ablation based on the three-dimensional electrophysiological model of the human tissue 7.

[0043] refer to Figure 2 and Figure 3 The first curved portion 3 is bent in a plane close to the vertical tube body 1 .

[0044] The first bend 3 is located near the middle of the electrode branch 2. Therefore, after the branch electrode is bent at the first bend 3, it extends in the same plane as the remaining electrode branches 2. This allows the electrode branches 2 at both ends of the first bend 3 to be mapped together, thereby maximizing the utilization of the electrode branches 2.

[0045] In addition, multiple independent electrode branches 2 are arranged along the circumference of the tube body 1, and when the electrode branches 2 are mapping the tissue 7, they will unfold into a plane perpendicular to the tube body 1, and then be attached to the tissue 7 for mapping. Therefore, when the first curved portion 3 bends, it bends in the plane where the electrode branches 2 are attached to the tissue 7, that is, a plane perpendicular to the tube body 1. Therefore, when the first curved portion 3 is attached to the tissue 7, the curved shape increases the contact length between the electrode branches 2 and the tissue 7, thereby increasing the contact area between the electrode branches 2 and the tissue 7 and reducing the compression damage of the electrode branches 2 to the tissue 7. On the other hand, the first curved portion 3 bends perpendicularly to the direction of the tube body 1, so that when the electrode branches 2 are attached to the tissue 7, the electrode branches 2 can be utilized to the greatest extent in the length direction.

[0046] refer to Figure 2 and Figure 3 Both ends of the electrode branch 2 extend from the first bend 3 toward the tube body 1 .

[0047] refer to Figure 2 and Figure 3In order to make the first bend 3 located at the position where the branch electrode is farthest from the tube body 1, the electrode branch 2 extends toward the tube body 1 on both sides of the first bend 3, so that when the electrode branch 2 is in contact with the tissue 7, the first bend 3 will first contact the tissue 7.

[0048] refer to Figure 3 In a specific embodiment, the end of the electrode branch 2 away from the tube body 1 is a free end. The free end of the electrode branch 2 extends toward the tube body 1; and the electrode branch 2 is annular.

[0049] refer to Figure 3 By setting the electrode branch 2 into a ring shape, the end of the electrode branch 2 is hidden, thereby reducing the possibility of the end of the electrode branch 2 causing puncture to the human tissue 7.

[0050] refer to Figure 3 One end of the electrode branch 2 is fixedly connected to the tube body 1, and the other end of the electrode branch 2 is a free end. In this case, after passing through the first bend 3, the free end of the electrode branch 2 extends toward the tube body 1, thereby hiding the tip of the free end of the electrode branch 2 near the tube body 1. In this way, when the electrode branch 2 is in contact with the tissue 7, since the tip of the free end of the electrode branch 2 is located near the tube body 1, the first bend 3 will first contact the tissue 7, thereby reducing the possibility of the free end of the electrode branch 2 causing injury to the tissue 7.

[0051] refer to Figure 1 and Figure 2 In another specific embodiment, the first bend 3 is located at the position where the electrode branch 2 is farthest from the tube body 1. Both ends of the electrode branch 2 extend toward the tube body 1 and are affixed to the tube body 1, giving the electrode branch 2 a ring shape. When the electrode branch 2 comes into contact with tissue 7, the first bend 3 first contacts the tissue 7. Since both ends of the electrode branch 2 are affixed to the tube body 1, the possibility of the tip of the electrode branch 2 causing injury to the tissue 7 is reduced, further reducing the probability of premature beats.

[0052] refer to Figure 2 and Figure 3 On the other hand, in the present application, the electrode branch 2 is set to be long and strip-shaped, and the electrode branch 2 is bent near the middle to form a first bent portion 3. Both ends of the electrode branch 2 are set near the tube body 1, so that the electrode branch 2 presents a ring structure, thereby enabling each branch electrode to achieve a larger mapping range. The mapping range of each electrode branch 2 is equivalent to twice the mapping range of a conventional electrode branch 2. This greatly improves the mapping range of the electrode branch 2. In addition, it also reduces the number of electrode branches 2 set on the tube body 1, thereby reducing the manufacturing cost of the electrode branch 2.

[0053] refer to Figure 2 and Figure 3 The electrode branch 2 includes a second curved portion 4, which is located at a position of the electrode branch 2 close to the tube body 1. The second curved portion 4 is curved in a direction away from the central axis of the catheter.

[0054] refer to Figure 2 and Figure 3 The second bending portion 4 is located at the root of the electrode branch 2 and is used to adjust the direction of the electrode branch 2 so that when the electrode branch 2 is mapped in the human body, the second bending portion 4 can cause the distal end of the electrode branch 2 to bend in a direction away from the tube body 1, thereby enabling the electrode branch 2 to map a larger range of human tissue 7, thereby improving the mapping efficiency.

[0055] refer to Figure 1 and Figure 2 In a specific embodiment, the tube body 1 is a hollow structure, and a pull rod 6 is slidably connected inside the tube body 1, and one end of the electrode branch 2 is fixed to the distal end of the pull rod 6; the end of the electrode branch 2 away from the pull rod 6 is fixed to the tube body 1.

[0056] refer to Figure 1 and Figure 2 The two ends of the electrode branch 2 are respectively fixed on the pull rod 6 and the tube body 1. Therefore, when the pull rod 6 moves back and forth inside the tube body 1, the two ends of the electrode branch 2 will approach or move away from each other as the pull rod 6 moves.

[0057] refer to Figure 1 and Figure 2 When the control pull rod 6 moves toward the distal end of the tube body 1, it will simultaneously drive the two ends of the electrode branch 2 away from each other, and the electrode branch 2 will be subjected to a tensile force, so that the first bend 3 and the second bend 4 of the electrode branch 2 and the electrode branch 2 body are stretched into a straight line. At this time, the electrode branch 2 is stretched to be arranged along the axial direction of the tube body 1 under the tensile force of the pull rod 6, so that the electrode branch 2 is in a contracted shape and is contracted between the tube body 1 and the pull rod 6, so that the radial size of the electrode branch 2 in the tube body 1 is contracted to a very small size, thereby facilitating the delivery of the electrode branch 2 into the human body.

[0058] refer to Figure 1 and Figure 2After the electrode branch 2 is delivered to the human body, the pull rod 6 can be controlled to move toward the proximal end so that the two ends of the electrode branch 2 are close to each other. Under the elastic action of the first bend 3 and the second bend 4, the electrode branch 2 will move with the pull rod 6 so that the electrode branch 2 bends in the direction away from the tube body 1. And according to the distance the pull rod 6 moves, the distance between the electrode branch 2 and the tube body 1, that is, the degree of expansion of the electrode branch 2, can also be controlled. In addition, the radial size of the electrode branch 2 in the tube body 1 can be controlled when the tissue 7 is marked. Until the pull rod 6 is pulled toward the proximal end to the extreme position, the radial size of the electrode branch 2 is expanded to the maximum, and at the same time, both ends of the electrode branch 2 are located in a plane close to the vertical plane of the tube body 1. It makes it more convenient for the tube body 1 to control the electrode branch 2. The electrode branch 2 can be accurately delivered to the target position for marking under the control of the tube body 1.

[0059] The material of the electrode branch 2 is high molecular polyurethane. Preferably, a supporting skeleton is provided inside the tube wall of the electrode branch 2. Further preferably, the supporting skeleton is made of a memory material. Further preferably, the supporting skeleton is a memory metal.

[0060] The electrode branches 2 are used to support the ring electrodes 5 . Meanwhile, the electrode branches 2 made of high molecular weight polyurethane can provide good insulation for the ring electrodes 5 , thereby reducing the influence of the ring electrodes 5 on the calibration accuracy.

[0061] The support frame (not shown) is used to support the electrode branches 2. The support frame is placed inside the electrode branches 2, which are made of a polymer polyurethane. The support frame also has a certain degree of elasticity and memory, allowing the electrode branches 2 to unfold into a predetermined shape after being delivered into the human body, thereby mapping human tissue 7.

[0062] Memory metal is used as a supporting skeleton installed inside the electrode branch 2. When the electrode branch 2 is transported into the human body, even if the electrode branch 2 is subjected to external force, causing the shape of the electrode branch 2 to change, under the action of the memory metal, it will rely on the memory characteristics to restore to the preset state after being transported into the human body.

[0063] refer to Figure 1 and Figure 2 When the distal end of the pull rod 6 moves close to the distal end of the tube body 1 , the electrode branch 2 is annularly bent in the radial direction of the tube body 1 .

[0064] refer to Figure 1 and Figure 2 The plane where the ring formed by the electrode branch 2 is located tends to be perpendicular to the pull rod 6.

[0065] refer to Figure 1 and Figure 2 When the pull rod 6 is pulled toward the proximal end, because the first bend 3 bends in a plane perpendicular to the tube body 1, as the electrode branch 2 bends as its ends approach, the first bend 3 causes the electrode branch 2 to rotate in a direction perpendicular to the tube body 1, resulting in a circular projection of the electrode branch 2 within the cross-section of the tube body 1. When the pull rod 6 has pulled the ends of the electrode branch 2 to their extreme position, the electrode branch 2 assumes a circular shape, connected end to end or close together, and extending along a plane perpendicular to the tube body 1. Therefore, as the pull rod 6 is pulled toward the proximal end, the ends of the electrode branch 2 gradually approach each other, and the body of the electrode branch 2 undergoes a certain degree of rotational deformation while bending at the first bend 3, resulting in an inclined angle between the body of the electrode branch 2 and the axis of the tube body 1. As the ends of the electrode branch 2 gradually approach each other, the angle between the electrode branch 2 and the axis of the tube body 1 increases, until the electrode branch 2 and the axis of the tube body 1 are nearly perpendicular; that is, when the electrode branch 2 bends, it tends to align with the plane perpendicular to the pull rod 6. The electrode branches 2 are located on both sides of the first curved portion 3 in adjacent planes, thereby avoiding the effect of reduced mapping efficiency caused by the time difference in contact with the tissue 7 due to the large gap between the electrode branches 2 on the axis of the tube body 1 when the electrode branches 2 are mapped.

[0066] In summary, the present application provides an electrophysiological mapping catheter. In a specific embodiment, one end of the electrode branch 2 is fixed to the tube body 1, and the other end of the electrode branch 2 is fixed to the pull rod 6. When the electrophysiological catheter is in use, the pull rod 6 is controlled to pull the pull rod 6 toward the distal end, so that the two ends of the electrode branch 2 are stretched by the pull rod 6 and the tube body 1 respectively, and then the electrode branch 2 is in a straightened state, and the electrode branch 2 is abutted against the pull rod 6, and the electrode branch 2 is in a contracted state. Then, the electrode branch 2, the pull rod 6 and the tube body 1 are transported to the target position inside the human body through the sheath, and then the pull rod 6 is pulled toward the proximal end to bend the electrode branch 2, and finally the two ends of the electrode branch 2 are in a close extreme position. Under the action of the first bending portion 3, the electrode branch 2 presents a ring structure, and then the tube body 1 is controlled to make the ring electrode 5 on the electrode branch 2 contact the tissue 7 for mapping. When the mapping is completed, the pull rod 6 is pushed toward the distal end again to stretch and contract the electrode branch 2, and then withdraw it from the sheath into the human body.

[0067] In another specific embodiment, one end of the electrode branch 2 is fixed to the tube body 1, and the other end of the electrode branch 2 is a free end. When the electrode branch 2 and the tube body 1 are delivered into the human body, the electrode branch 2 is first stretched toward the proximal end and pressed against the tube body 1, then delivered into the sheath, and the electrode branch 2 is delivered to the target position inside the human body through the sheath. The tube body 1 is then pushed to push the branch electrode out of the sheath. The electrode branch 2 returns to a ring shape under the action of elasticity, and then the tissue 7 is mapped. After the mapping of the tissue 7 is completed, the tube body 1 is directly pulled toward the proximal end, and the electrode branch 2 will contract under the action of the sheath, and then be discharged out of the body along the sheath.

[0068] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An electrophysiological mapping catheter, characterized in that: It comprises a tube body and an electrode branch arranged at the distal end of the tube body, wherein a plurality of the electrode branches are arranged along the circumference of the tube body, and the electrode branches extend from the position connected to the tube body in a direction away from the tube body; The electrode branch includes a first curved portion, and the first curved portion is located near the distal end of the electrode branch; The electrode branch includes a second curved portion, which is located at a position of the electrode branch close to the tube body. The second curved portion is in a curved shape that bends in a direction away from the central axis of the catheter.

2. The catheter according to claim 1, wherein The first bend is located at a position where the electrode branch is farthest from the catheter.

3. The catheter according to claim 1, wherein The first curved portion is curved in a plane close to a vertical plane of the tube body.

4. The catheter according to claim 1, wherein Both ends of the electrode branch extend from the first bent portion toward the tube body.

5. The catheter according to claim 1, wherein The tube body is a hollow structure, a pull rod is slidably connected inside the tube body, one end of the electrode branch is fixedly connected to the distal end of the pull rod; and the end of the electrode branch away from the pull rod is fixedly connected to the tube body.

6. The catheter according to claim 5, characterized in that When the distal end of the pull rod moves closer to the distal end of the tube body, the electrode branch bends in a ring shape in the radial direction of the tube body.

7. The catheter according to claim 5, characterized in that The plane where the ring formed by the electrode branches is located tends to be a plane perpendicular to the pull rod.

8. The catheter according to claim 1, wherein The end of the electrode branch away from the tube body is a free end.

9. The catheter according to claim 8, characterized in that The free end of the electrode branch extends toward the tube body; the electrode branch is ring-shaped.

10. The catheter according to claim 1, wherein The material of the electrode branches is high molecular polyurethane.

11. The catheter according to claim 10, characterized in that A supporting skeleton is arranged inside the tube wall of the electrode branch.

12. The catheter according to claim 11, wherein The supporting frame is made of a memory qualitative material.

13. The catheter according to claim 11, wherein The supporting frame is memory metal.

14. The catheter according to claim 1, wherein Ring electrodes that can be used for mapping are arranged on the electrode branches.

Images