Basket assembly and basket catheter

Abstract

The present invention relates to the field of electrophysiological catheters, and in particular, to a basket catheter and a basket assembly of the basket catheter. Provided are a basket assembly and a basket catheter. The basket assembly comprises a proximal connecting base, a distal connecting base, and splines. The proximal connecting base is configured to be fixedly connected to proximal ends of the splines, and the distal connecting base is configured to be fixedly connected to distal ends of the splines. During processes in which the distal connecting base moves close to and away from the proximal connecting base, the splines have a closed state and an open state. The spline comprises: a support frame having elasticity; and a flexible connecting member attached to the support frame. The flexible connecting member comprises an extending portion and a reverse folding portion. The extending portion is exposed beyond a distal end of the support frame, the reverse folding portion is connected to the extending portion and folded toward a proximal end of the basket assembly, and the reverse folding portion is fixed to the distal connecting base. The present invention primarily solves the technical problem that the basket assembly is not easily attached well to the target biological tissue.

Description

Basket assembly and basket catheter TECHNICAL FIELD

[0001] The present application relates to the field of electrophysiological catheter, in particular to a basket catheter and a basket assembly of the basket catheter. BACKGROUND

[0002] Electrophysiological catheters can be used for cardiac electrophysiological mapping and cardiac ablation. The diagnosis of arrhythmia often needs to rely on high-density contact mapping technology, and the electrode needs to be in good contact with the heart tissue during the mapping process to ensure the accuracy of the mapping. In the process of high-density mapping of cardiac electrophysiology, a basket catheter, i.e. a mapping catheter with a basket structure, is often used because the mapping catheter with a basket structure can carry more electrodes.

[0003] The basket assembly of the basket catheter can include a distal end connecting seat, a proximal end connecting seat, and a spline connected between the distal end connecting seat and the proximal end connecting seat. The spline can be made of nickel-titanium alloy or other materials, has good elasticity, and can be provided with electrodes to achieve mapping and / or ablation.

[0004] In order to ensure the stability of the distribution position of each electrode on each spline, the spline needs to have a certain rigidity, but the rigidity of the spline will limit the flexibility of the basket assembly, affect the deformation of the basket assembly, and cause the basket assembly to not easily well adhere to the target biological tissue. SUMMARY

[0005] The present application mainly solves the technical problem that the basket assembly is not easy to well adhere to the target biological tissue.

[0006] In a first aspect, the present application provides a basket assembly.

[0007] The basket assembly comprises a proximal end connecting seat, a distal end connecting seat, and a spline;

[0008] The proximal end connecting seat is used for fixedly connecting the proximal end of the spline, and the distal end connecting seat is used for fixedly connecting the distal end of the spline;

[0009] The spline has a folded state and an open state in the process of approaching and moving away from the proximal end connecting seat;

[0010] The spline comprises:

[0011] A support framework, the support framework has elasticity;

[0012] A flexible connecting piece, the flexible connecting piece is attached to the support framework, the flexible connecting piece comprises an outward extending portion and a reverse folding portion, the outward extending portion exposes the distal end of the support framework, the reverse folding portion is connected with the outward extending portion and folds toward the proximal end of the basket assembly, and the reverse folding portion is fixed on the distal end connecting seat.

[0013] In one embodiment, the flexible connecting member comprises an arc-shaped bent portion, the arc-shaped bent portion is connected between the overhanging portion and the reverse bent portion, the arc-shaped bent portion and the overhanging portion and the reverse bent portion form a "U" shape, and the opening of the "U" shape faces the proximal end of the basket assembly.

[0014] In one embodiment, the arc-shaped bent portion protrudes from the distal end face of the distal connecting seat, or the distal end of the arc-shaped bent portion is flush with the distal end face of the distal connecting seat.

[0015] In one embodiment, a flexible circuit board is included, the flexible circuit board comprises an insulating base and an electrode, and the flexible connecting member is formed by the flexible circuit board.

[0016] In one embodiment, the flexible circuit board has an inner side, the inner side is the side of the flexible circuit board close to the line connecting the proximal connecting seat and the distal connecting seat, and a flexible reinforcing layer is arranged on the inner side.

[0017] In one embodiment, the flexible circuit board has an inner side, the inner side is the side of the flexible circuit board close to the line connecting the proximal connecting seat and the distal connecting seat, and the support framework is arranged on the inner side of the flexible circuit board.

[0018] In one embodiment, a fixing ring is included, the fixing ring is sleeved on the outer side of the distal connecting seat, and the reverse bent portion has a fixing section, the fixing section is arranged between the fixing ring and the outer peripheral surface of the distal connecting seat.

[0019] In one embodiment, a solidified colloid is included, at least a part of the solidified colloid is located on the distal side of the fixing ring, and the solidified colloid has elasticity; the flexible connecting member has a transition section located on the distal side of the fixing section, and the solidified colloid fixes the transition section on the distal connecting seat.

[0020] In one embodiment, the proximal end of the support framework is parallel to the line connecting the proximal connecting seat and the distal connecting seat, the proximal end of the support framework is fixed on the proximal connecting seat, and when the spline is in the retracted state, the reverse bent portion is parallel to the support framework.

[0021] In a second aspect, the present application provides a basket catheter.

[0022] The basket catheter comprises:

[0023] A handle;

[0024] An insertion tube, the insertion tube is connected to the distal end of the handle;

[0025] a basket assembly, the basket assembly being the basket assembly of any of the above, the basket assembly being connected at a distal end of the insertion tube;

[0026] and a pull rod movably arranged in the insertion tube, the pull rod being connected with the distal end connecting seat to drive the distal end connecting seat to move towards and away from the proximal end connecting seat.

[0027] The beneficial effects of the present application are:

[0028] In an embodiment of the basket assembly, the spline is connected between the distal end connecting seat and the proximal end connecting seat, and the elastic supporting framework enables the spline to have a retracted state and an open state during the movement of the distal end connecting seat towards and away from the proximal end connecting seat. Meanwhile, the spline comprises a flexible connecting piece, and an overhanging portion of the flexible connecting piece exposed at a distal end of the supporting framework is connected with a reverse folding portion, which is fixed on the distal end connecting seat. The reverse folding portion can enable the distal end portion of the spline to be relatively flexible in circumferential deflection, radial movement, or torsional deformation along the basket assembly, and thus has better self-adaptability when the basket assembly is attached to the target biological tissue, thereby more easily attaching to the target biological tissue.

[0029] In addition, the flexible deformation of the reverse folding portion can avoid the basket assembly from rigidly contacting the biological body, which is beneficial to avoid scratching the biological body and has better safety, and is also beneficial to avoid the spline from being broken due to excessive stress. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a structural schematic view of an embodiment of the basket assembly in the present application in a fully open state;

[0031] Fig. 2 is a partial enlarged view of the spline portion in Fig. 1;

[0032] Fig. 3 is a sectional view of the connection portion between the spline and the distal end connecting seat in Fig. 2;

[0033] Fig. 4 is a perspective view of the connection portion between the spline and the distal end connecting seat in Fig. 2;

[0034] Fig. 5 is a partial structural perspective view of the basket assembly in Fig. 1 in a retracted state;

[0035] Fig. 6 is a sectional view of the basket assembly in Fig. 5;

[0036] Fig. 7 is a structural schematic view of the distal end portion of the spline in Fig. 6.

[0037] List of corresponding feature names of reference signs in the drawings:

[0038] 100, proximal end connecting seat;

[0039] 200, distal end connecting seat;

[0040] 300 spline; 310 support skeleton; 320 flexible circuit board; 321 insulating base; 322 electrode; 323 flexible reinforcing layer; 330 flexible connecting piece; 331 overhanging portion; 332 arc-shaped bent portion; 333 reverse bent portion;

[0041] 400 fixing ring;

[0042] 500 pull rod;

[0043] 600 sensor;

[0044] 700 insertion tube. DETAILED DESCRIPTION

[0045] The application will be further described below in connection with specific embodiments with reference to the drawings, wherein similar elements in different embodiments are denoted by like reference numerals. In the following embodiments, many specific details are described in order to provide a more thorough understanding of the application. However, it will be apparent to one skilled in the art that some features, which are not necessary for an understanding of the application, can be omitted or replaced by other features, materials, methods, etc. In some cases, some operations related to the application are not shown or described in the specification in order to avoid the core of the application being overwhelmed by too much description, and it is not necessary to describe these operations in detail for one skilled in the art to fully understand the related operations according to the description in the specification and general technical knowledge in the art.

[0046] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be sequentially adjusted or changed in a manner that is obvious to one skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment, and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0047] The serial numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "coupling" in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0048] In the embodiment of the present application, the spline 300 of the basket assembly is provided with a flexible connecting piece 330, the distal end of the flexible connecting piece 330 is provided with a reverse folding part 333, the reverse folding part 333 is fixed on the distal end connecting seat 200, forming a deformable hinge structure, which can adaptively move when the spline 300 is subjected to the reaction force of the target biological tissue, so as to more easily abut against the target biological tissue.

[0049] The embodiment of the basket assembly in the present application:

[0050] In one embodiment, referring to FIG. 1, the basket assembly includes a proximal end connecting seat 100, a distal end connecting seat 200 and a spline 300, the proximal end connecting seat 100 is used for fixedly connecting the proximal end of the spline 300, and the distal end connecting seat 200 is used for fixedly connecting the distal end of the spline 300.

[0051] It should be noted that the "proximal end" and "distal end" appearing in the present article are the conventional terms in the medical field, for the instrument to be operated, the proximal end is the end close to the operator of the instrument, and the distal end is the end away from the operator of the instrument, and the distal end is usually the end first entering the patient's body; the proximal end and the distal end can refer to the orientation shown in FIG. 1.

[0052] In a specific embodiment, the proximal end connecting seat 100 can be a pipe body, and the inner cavity of the pipe body forms a connecting cavity for the proximal end of the spline 300 to be inserted and fixedly connected. The specific fixing manner of the spline 300 and the proximal end connecting seat 100 is not limited, for example, the spline 300 and the proximal end connecting seat 100 can be fixedly connected by bonding, welding or the like. In the assembly of the basket catheter, the proximal end connecting seat 100 can be connected with the insertion tube of the basket catheter, so that the basket assembly can be conveyed to the target position by the insertion tube.

[0053] Referring to FIGS. 3 and 6, in a specific embodiment, the distal end connecting seat 200 is a sleeve structure. The central hole of the sleeve can be connected with the pull rod 500, so as to drive the distal end connecting seat 200 to move through the pull rod 500. The central hole of the distal end connecting seat 200 can also be provided with a sensor 600, which is used for realizing the position detection of the basket assembly, for example, can be a magneto-electric positioning sensor. The above-mentioned pull rod 500 can pass through the insertion tube of the basket catheter and be connected to the handle of the basket catheter, and a driving knob can be arranged on the handle. Operating the driving knob can drive the pull rod 500 to move towards the distal end or the proximal end of the basket assembly, and then drive the distal end connecting seat 200 to move towards the distal end or the proximal end of the basket assembly through the pull rod 500.

[0054] Those skilled in the art can understand that the proximal connecting seat 100 and the distal connecting seat 200 can also be replaced by other structural forms as long as the installation of the spline 300 can be realized; the accessories connected on the proximal connecting seat 100 and the distal connecting seat 200 can also be set according to the needs. Moreover, those skilled in the art can understand that the specific structure of the pull rod 500 and the handle can refer to the existing structure in the related art, and considering that the innovative content of the present application and the technical problems to be solved have no direct relation, the details are not described here.

[0055] Since the proximal connecting seat 100 is fixed on the insertion tube 700, when the distal connecting seat 200 moves towards the proximal end of the basket assembly, the distal connecting seat 200 gradually approaches the proximal connecting seat 100, and the basket assembly is gradually opened from the collapsed state until it moves to the maximum stroke, at which time the basket assembly is in a fully open state. During the opening process of the basket assembly, since the main body part of the spline 300 has elasticity, the spline 300 can smoothly bend to the radial outside of the basket assembly, as shown in FIGS. 1-4; when the distal connecting seat 200 moves towards the distal end of the basket assembly, the distal connecting seat 200 gradually moves away from the proximal connecting seat 100, and the basket assembly gradually collapses until it moves to the maximum stroke, at which time the basket assembly is in a fully collapsed state, and the main body part of each spline 300 is in a flat state, as shown in FIGS. 5 and 6.

[0056] It should be noted that the open state of the basket assembly refers to the state in which the basket assembly can be used for electrophysiological mapping or ablation of the heart; according to the morphology and size of the target biological tissue, the basket assembly can have different degrees of opening. In FIGS. 1-4, only the state when the basket assembly is fully open is shown.

[0057] The structure of the spline 300 itself and the connection structure of the spline 300 between the proximal connecting seat 100 and the distal connecting seat 200 will affect the opening form of the basket assembly, which will be described in detail below. It should be noted that the number of splines 300 is not limited in the present application.

[0058] In some embodiments, the spline 300 can include a support skeleton 310 and a flexible circuit board 320.

[0059] The support skeleton 310 is elastic and can be made of elastic metal, such as nickel-titanium alloy, which has good biocompatibility and can well return to the original shape after being deformed by external force. The support skeleton 310 can be in a straight structure when the distal end connecting seat 200 is in a free state, and at this time, the support skeleton 310 can make the spline 300 close to the distal end connecting seat 200 and the pull rod 500, so that the basket assembly is as small as possible in the radial dimension. In some embodiments, the support skeleton 310 can be in a sheet shape, which is convenient for the connection of the flexible circuit board 320. Those skilled in the art can understand that in some other embodiments, the support skeleton 310 can also be replaced by other forms, such as a wire shape.

[0060] The flexible circuit board 320 has an inner side, which is the side of the flexible circuit board 320 close to the connecting line of the proximal end connecting seat 100 and the distal end connecting seat 200. In a specific embodiment, the support skeleton 310 can be arranged on the inner side of the flexible circuit board 320, so that the electrodes 322 on the flexible circuit board 320 are directed to the outer side of the basket assembly, thereby being able to be attached to the target biological tissue. The flexible circuit board 320 can be fixed to the support skeleton 310 by adhesion, and the adhesive can be polyurethane glue, UV glue, epoxy resin, acrylic resin, etc. The proximal end of the support skeleton 310 can be flush with the proximal end of the spline 300, and the support skeleton 310 and the part of the flexible circuit board 320 connected to the support skeleton 310 integrally form the main part of the spline.

[0061] In a specific embodiment, the flexible circuit board 320 can include an insulating substrate 321 and electrodes 322. Those skilled in the art should know that the material of the insulating substrate 321 can be polyimide (PI), polyethylene terephthalate (PET), etc., and the material of the electrodes 322 can be platinum-iridium alloy, stainless steel alloy, copper, etc. The electrodes 322 can be combined with the insulating substrate 321 in various ways, such as by pasting, etching, plating, etc. The electrodes 322 have exposed discharge surfaces and can form an electric field when in use. The number, shape, size and distribution position of the electrodes 322 on a single spline 300 are not limited in the present application, and those skilled in the art can design them according to needs. In some embodiments, the flexible circuit board 320 can also include a cover layer, which can be made of the same material as the insulating substrate 321 and can be combined with the insulating substrate 321 by adhesion, hot pressing, etc., thereby protecting the circuit on the insulating substrate 321.

[0062] In order to make the electrodes 322 on the flexible circuit board 320 better adhere to the target biological tissue, in an embodiment, as shown in FIG. 3 and FIG. 7, the length of the flexible circuit board 320 is greater than the length of the support skeleton 310, the distal end of the flexible circuit board 320 extends beyond the distal end of the support skeleton 310 to form an overhanging portion 331; in addition, the flexible circuit board 320 includes a reverse folding portion 333, which is connected with the overhanging portion 331 and folds towards the proximal end of the basket assembly, and the reverse folding portion 333 is fixed on the distal end connecting seat 200. The above-mentioned overhanging portion 331 and reverse folding portion 333 of the flexible circuit board 320 constitute a flexible connecting piece 330, which can form a flexible hinge, thereby increasing the flexibility of the distal end of the spline 300. When the basket assembly is subjected to a force having an angle with the axial direction of the basket assembly, each corresponding spline 300 can relatively easily displace, for example, in the direction indicated by the bidirectional arrow in FIG. 2, or for example, in the radial direction of the basket assembly corresponding to the spline 300, which can increase the compliance of the entire basket assembly to better adhere to the target biological tissue.

[0063] In addition, the flexible connecting piece 330 can also avoid the opening on the flexible circuit board 320 being torn by external force to cause the spline 300 to break, thereby ensuring the reliability of the basket assembly.

[0064] In addition, the splines 300 of the basket catheter are arranged in the circumferential direction, and in the process of using the basket catheter, the target biological tissue can enter the space between the splines 300, and the basket assembly can easily scratch the biological tissue during rotation or movement. The flexible hinge formed by the overhanging portion 331 and the reverse folding portion 333 can avoid hard contact between the spline 300 and the biological tissue, which is beneficial to avoid the basket assembly scratching the biological tissue and improve the safety of the operation.

[0065] In some other embodiments, the flexible connecting piece 330 can also be a separate structure independent of the flexible circuit board 320, such as a sheet structure formed of polyimide (PI), polyethylene terephthalate (PET), etc. In addition, in some other embodiments, the proximal end of the flexible connecting piece 330 can be directly connected with the distal end of the support skeleton 310.

[0066] The fixing manner between the reverse folding portion 333 and the distal end connecting seat 200 is not limited, for example, in an embodiment, the basket assembly can include a fixing ring 400 sleeved outside the distal end connecting seat 200, and the reverse folding portion 333 has a fixing section, i.e. the part of the reverse folding portion 333 between the fixing ring 400 and the outer peripheral surface of the distal end connecting seat 200. When connecting the reverse folding portion 333 to the distal end connecting seat 200, the flexible circuit board 320 at the distal end of the spline 300 can be bent to form the reverse folding portion 333 extending towards the proximal end of the basket assembly in the collapsed state of the basket assembly, the reverse folding portion 333 is inserted into the gap between the distal end connecting seat 200 and the fixing ring 400, and then the reverse folding portion 333 is glued and fixed to the distal end connecting seat 200. The fixing ring 400 can play an auxiliary fixing and positioning role, and can ensure the uniformity of the distribution of the splines 300. In some other embodiments, the reverse folding portion 333 can also be clamped and fixed by the fixing ring 400.

[0067] The fixing ring 400 described above can be a developing ring, which can be used for developing and fixing the flexible circuit board 320 at the head end of the basket catheter at the same time, which is beneficial to reduce the number of parts and help save space and reduce costs. Those skilled in the art should know that the developing ring in the ablation catheter can be made of noble metals such as platinum and iridium, and such a ring can be clearly visible under X-ray, so that the doctor can accurately control the position of the catheter during operation. In some other embodiments, a separate ring body can be provided as the fixing ring 400, which is only used for fixing the reverse folding portion 333 to the distal end connecting seat 200. In addition, in some other embodiments, the reverse folding portion 333 can also be directly bonded to the outer peripheral surface of the distal end connecting seat 200 or the hole wall of the central hole of the distal end connecting seat 200, and an L-shaped bending section can also be provided at the end of the reverse folding portion 333 to be fixed to the end surface of the distal end connecting seat 200.

[0068] The reverse folding portion 333 and the distal end connecting seat 200 can form a fixed connection region, and the distal end side edge of the fixed connection region has a spacing from the distal end of the flexible connecting piece 330. The above spacing can increase the flexibility of the spline 300 during the opening of the basket. When the fixing ring 400 is used to fix the reverse folding portion 333, the fixed connection region corresponds to the fixing section of the reverse folding portion 333 and is distributed around the axis of the distal end connecting seat 200.

[0069] In one embodiment, the flexible connecting member 330 includes an arc-shaped bending portion 332, which is connected between the outward extending portion 331 and the reverse bending portion 333, and forms a "U" shape with the outward extending portion 331 and the reverse bending portion 333, and the opening of the "U" shape faces the proximal end of the basket assembly. The bending portion is arranged to enable smooth reverse bending of the flexible circuit board 320, and is more conducive to avoiding breakage of the flexible circuit board 320. In some other embodiments, the reverse bending portion 333 can also be directly bent, and a crease is formed between the outward extending portion 331 and the reverse bending portion 333.

[0070] In one embodiment, referring to FIGS. 5 and 6, the arc-shaped bending portion 332 protrudes from the distal end face of the distal connecting seat 200; in some other embodiments, the distal end of the arc-shaped bending portion 332 can also be flush with the distal end face of the distal connecting seat 200. In the opening process of the basket, the protruding or flush structure described above can increase the flexibility of the spline 300 movement, and enable the distal end side of the basket assembly to be more flat after being opened, and the distal connecting seat 200 does not protrude from the spline 300, which enables the electrode 322 to better abut against the target biological tissue when abutting against the myocardium, and the pressure generated when the doctor abuts against the myocardium is also smaller compared to the structure in which the distal connecting seat protrudes from the spline, which is conducive to increasing the safety of the patient.

[0071] Of course, in some other embodiments, the distal end of the arc-shaped bending portion 332 can also be closer to the proximal end of the basket assembly compared to the distal end face of the distal connecting seat 200.

[0072] In one embodiment, the basket assembly can also include a cured gel (not shown in the figure), at least a portion of the cured gel is located on the distal side of the fixing ring 400, and the cured gel has elasticity; the cured gel can be formed by curing a glue solution such as polyurethane, epoxy resin, and acrylate. The flexible connecting member 330 has a transition section located on the distal side of the fixing section, and the cured gel fixes the transition section on the distal connecting seat 200. By arranging the cured gel and the transition section, the elastic cured gel can follow the deformation of the flexible connecting member 330, and plays a buffering and protection role, the flexible connecting member 330 formed by the flexible circuit board 320 does not rub against or is not cut by the fixing ring 400 when being activated, which is conducive to avoiding breakage of the flexible circuit board 320, and can improve the working reliability of the basket assembly.

[0073] Referring to FIG. 7, in an embodiment, the flexible circuit board 320 comprises a flexible reinforcing layer 323 disposed on the inner side of the flexible circuit board 320. In some embodiments, the flexible reinforcing layer 323 can be polyurethane, polyimide, polyethylene fiber, polyester fiber, nylon fiber, dacron fiber, polyethylene terephthalate, etc. The flexible reinforcing layer 323 can be fixedly attached to the side of the insulating substrate 321 opposite to the electrode 322, and the flexible reinforcing layer 323 can be bent synchronously with the insulating substrate 321 to improve the bending fatigue strength of the flexible circuit board 320. In an embodiment, the flexible reinforcing layer 323 can have the same width as the insulating substrate 321; in some other embodiments, the width of the flexible reinforcing layer 323 can be smaller or larger than the width of the insulating substrate 321. Those skilled in the art can understand that the flexibility of the flexible reinforcing layer 323 should be greater than the flexibility of the support skeleton 310, i.e., the flexible reinforcing layer 323 can deform more easily than the support skeleton 310. The flexible reinforcing layer 323 can be disposed only at the position of the flexible circuit board 320 used to form the flexible connector 330, or can be disposed on the entire flexible circuit board 320.

[0074] In an embodiment, the proximal end of the support skeleton 310 is parallel to the line connecting the proximal connector seat 100 and the distal connector seat 200, and the proximal end of the support skeleton 310 is fixed to the proximal connector seat 100. When the spline 300 is in the collapsed state, the reverse folding portion 333 is parallel to the support skeleton 310. The proximal end of the support skeleton 310 and the reverse folding portion 333 adopt the above structure, and when the basket assembly is opened, a pear-shaped structure with a large distal diameter and a small proximal diameter can be formed, which can more easily meet the needs of mapping or ablation. In some other embodiments, the reverse folding portion 333 can also have an angle with the axis of the basket assembly.

[0075] It should be further noted that the basket assembly comprising the flexible connector 330 described above can be used for electrophysiological mapping of the heart. In some other embodiments, the basket assembly comprising the flexible connector 330 described above can also be used for ablation of the heart, such as pulsed field ablation (PFA) or radiofrequency ablation (RF).

[0076] Embodiments of the basket catheter in the present application:

[0077] The basket catheter comprises a handle, an insertion tube, a basket assembly, and a pull rod 500. The insertion tube is connected to the distal end of the handle, and the basket assembly is connected to the distal end of the insertion tube. The basket assembly is any of the basket assemblies described in the above embodiments, and will not be described here again. The pull rod 500 is movably disposed in the insertion tube, and the pull rod 500 is connected to the distal connector seat 200 of the basket assembly to drive the distal connector seat 200 to move closer to and farther away from the proximal connector seat 100.

[0078] The above application of specific examples to illustrate the present invention, is only used to help understand the present invention, and does not limit the present invention. For the skilled in the art to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformation or replacement can be made.

Claims

1. A basket assembly, characterized in that, Includes a near-end connector, a far-end connector, and a spline; The proximal connector is used for fixed connection of the proximal end of the spline, and the distal connector is used for fixed connection of the distal end of the spline. As the distal connector approaches and moves away from the proximal connector, the spline has a retracted state and an open state. The spline includes: A support frame, wherein the support frame is elastic; A flexible connector is attached to the support frame. The flexible connector includes an extended portion and a folded portion. The extended portion protrudes from the distal end of the support frame. The folded portion is connected to the extended portion and folded towards the proximal end of the basket assembly. The folded portion is fixed to the distal end connector.

2. The basket assembly as described in claim 1, characterized in that, The flexible connector includes an arc-shaped bend portion that connects the extended portion and the reverse bend portion. The arc-shaped bend portion, the extended portion, and the reverse bend portion form a "U" shape, and the opening of the "U" shape faces the proximal end of the basket assembly.

3. The basket assembly as described in claim 2, characterized in that, The arc-shaped bend protrudes from the distal end face of the distal connector, or the distal end of the arc-shaped bend is flush with the distal end face of the distal connector.

4. The basket assembly as described in any one of claims 1 to 3, characterized in that, The invention includes a flexible circuit board, which comprises an insulating substrate and electrodes, and the flexible connector is formed from the flexible circuit board.

5. The basket assembly as described in claim 4, characterized in that, The flexible circuit board has an inner side surface, which is the side of the flexible circuit board near the line connecting the proximal connector and the distal connector, and a flexible reinforcing layer is provided on the inner side surface.

6. The basket assembly as described in claim 4, characterized in that, The flexible circuit board has an inner side surface, which is the side of the flexible circuit board near the line connecting the proximal connector and the distal connector, and the support frame is disposed on the inner side surface of the flexible circuit board.

7. The basket assembly as described in any one of claims 1 to 3, characterized in that, It includes a retaining ring, which is fitted around the outside of the distal connector, and the folded portion has a fixing section, which is disposed between the retaining ring and the outer peripheral surface of the distal connector.

8. The basket assembly as described in claim 7, characterized in that, The device includes a curing colloid, at least a portion of which is located on the distal side of the fixing ring, and the curing colloid is elastic; the flexible connector has a transition section located on the distal side of the fixing section, and the curing colloid fixes the transition section to the distal connector.

9. The basket assembly as described in any one of claims 1 to 3, characterized in that, The proximal end of the support frame is parallel to the line connecting the proximal connector and the distal connector. The proximal end of the support frame is fixed to the proximal connector. When the spline is in the retracted state, the folded portion is parallel to the support frame.

10. A basket guide tube, characterized in that, include: handle; An insertion tube is connected to the distal end of the handle; A basket assembly, wherein the basket assembly is the basket assembly according to any one of claims 1 to 9, the basket assembly being connected to the distal end of the insertion tube; And a pull rod, which is movably disposed in the insertion tube and is connected to the distal connector of the basket assembly to drive the distal connector toward and away from the proximal connector.

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