Basket frame, basket ball bag, basket electrode assembly and basket catheter

Abstract

The present application discloses a basket frame, a basket ball capsule, a basket electrode assembly and a basket catheter, and relates to the technical field of medical devices. The basket catheter includes a basket electrode assembly, and the basket electrode assembly includes a basket frame, an electrode body and a basket ball capsule; the basket frame includes a connecting ring and a strip elastic body, and each strip elastic body is arranged at intervals along the circumferential direction of the connecting ring, and each strip elastic body is bent with a plane section at the distal end, and the free end of the plane section is bent with a concave section, and each concave section is used to enclose a concave area, and the connecting ring is located inside the concave area. The basket frame will not cause harm to the human body and has higher safety. The basket ball capsule includes an annular structure balloon, and the balloon is divided into a first fixed section with a thickness difference, a first deformation section, a second deformation section, a third deformation section and a second fixed section. The basket ball capsule has good support and adhesion, which is convenient for the electrode body to better contact with the ablation site to be discharged, so as to achieve efficient discharge conversion.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, specifically to a basket frame, a basket ball capsule, a basket electrode assembly and a basket catheter. Background Art

[0002] Atrial fibrillation (AF) is one of the most common arrhythmias in clinical practice. It is characterized by the loss of orderly electrical activity of the atria under the control of sinus rhythm, which is replaced by rapid and disordered fibrillation waves. As a result, the atria lose effective contraction and relaxation, the pumping function deteriorates or is lost, and the ventricles respond extremely irregularly. It is one of the main causes of sudden cardiac death.

[0003] Effective treatments for atrial fibrillation all aim to restore sinus rhythm, and are mainly divided into two categories: drug therapy and non-drug therapy. Drug therapy is mainly suitable for patients with first-time atrial fibrillation and paroxysmal atrial fibrillation who have no relevant contraindications. Drug therapy can control ventricular heart rate and ensure basic heart function, such as beta-blockers, amiodarone, digitalis, etc. Non-drug treatments mainly include anticoagulant therapy, electrical cardioversion, surgical maze surgery, and interventional therapy.

[0004] Interventional diagnosis and treatment is a modern medical technology that has been rapidly promoted in recent decades. It usually requires the use of catheter devices of various structures, shapes, and sizes to establish a channel between the lesion site in the patient's body and the external operating end to introduce various diagnostic and therapeutic instruments, drugs, and implanted devices to the lesion site of the patient, or to export body fluids from the lesion site. In the medical field, there are many types of interventional catheter devices, such as guide catheters, delivery sheaths, drainage catheters, etc. Interventional diagnostic and therapeutic catheters usually have an inner lumen tube for drugs, body fluids, and instruments to pass through. Due to the tortuous characteristics of the human cardiovascular circulatory system, interventional catheters usually must have good flexibility, torsion control, guidance, and sufficient axial and radial support. In addition, during the design and manufacturing process of interventional catheters, the distal end of the catheter will be made into different curved shapes according to the intended use to adapt to the anatomical morphology of the lumen of a specific lesion site, so that the distal end of the catheter is aligned with the lesion site, and the instrument or drug in the catheter is accurately guided to the lesion site. In recent years, many distal pre-shaped interventional catheters with various forms have been developed and used in clinical treatment.

[0005] However, in clinical use, individual differences in the anatomical structure of the human lumen are often encountered. Even the distal pre-shaped sheath designed according to the specific physiological and anatomical structure of the human body is difficult to adapt to the individualized anatomical structure of the human lumen, which hinders the surgical operation process and thus affects the surgical effect. In order to prevent such problems during the operation, doctors usually prepare several different specifications of distal pre-shaped sheaths. Once it is found that the distal shape of the selected catheter is not suitable for the lesion site, the catheter is withdrawn from the lumen, and a pre-shaped catheter of other specifications is selected and inserted into the lumen repeatedly. Sometimes, the distal end of the sheath is even reshaped into the required shape at the surgical site according to the patient's physiological and anatomical structure. This undoubtedly increases the cost borne by the patient, increases the complexity of the surgical process, and prolongs the patient's exposure to the X-ray environment, which is not conducive to the patient's health.

[0006] The commonly used basket catheters in the prior art are mostly standard spherical, and the top may cause harm to the human body. In addition, since the basket is usually a soft substrate made of nickel-titanium, it is easy to deform, which affects the use effect. In the prior art, balloons are used for support, but the shape of the balloons usually used is spherical. For example, the patent application with publication number CN114343831A shows that it uses a spherical balloon. This spherical balloon cannot fit the basket shape well and cannot achieve a good enough support effect. More importantly, the poor fit between the balloon and the basket will greatly affect the effect of ablation discharge. Therefore, optimizing the fit between the balloon and the basket will help improve the success rate of the operation. Summary of the invention

[0007] One purpose of the present application is to provide a basket frame, a basket electrode assembly and a basket catheter, which are less likely to cause harm to the human body and are safer.

[0008] Another object of the present application is to provide a basket balloon, a basket electrode assembly and a basket catheter with a balloon support and good balloon support adhesion.

[0009] In order to achieve the above objectives, the technical solution adopted in the present application is: a basket skeleton, comprising a connecting ring and at least three strip-shaped elastic bodies, the middle part of the connecting ring being used to form an instrument channel; each of the strip-shaped elastic bodies is arranged at intervals along the circumferential direction of the connecting ring; each of the strip-shaped elastic bodies is axially divided into a distal end and a proximal end along the connecting ring, and the proximal end of each of the strip-shaped elastic bodies is used to be connected to the catheter body; the distal end of each of the strip-shaped elastic bodies is radially bent inward along the connecting ring to form a planar section, the free end of the planar section is bent toward the proximal end to form a concave section and then connected to the connecting ring, each of the concave sections is used to enclose a concave area, and the connecting ring is located inside the concave area.

[0010] Preferably, a slot for connecting to the concave section is provided at one end of the connecting ring close to the proximal end or at an outer side wall of the connecting ring.

[0011] Preferably, the distance between the planar segment and the connecting ring along the axial direction of the connecting ring is 1 mm-2 mm.

[0012] Preferably, the depth of the concave area along the axial direction of the connecting ring is 1 / 3-1 / 2 of the radial dimension of the basket skeleton.

[0013] The present application also provides a tennis ball balloon, including a balloon, which is an annular structure, and is divided into a first fixed section, a first deformable section, a second deformable section, a third deformable section and a second fixed section along the proximal end to the distal end; the first fixed section is connected to the medium input conduit to form a seal, and the second fixed section is connected to the connecting ring to form a seal; the thickness of the first deformable section is equal or the thickness of the first deformable section increases successively in the direction away from the first fixed section; the thickness of the second deformable section increases successively in the direction away from the first deformable section; the third deformable section is bent toward the inner direction of the balloon, the thickness of the third deformable section decreases successively in the direction away from the second deformable section, and the minimum thickness of the third deformable section is greater than the maximum thickness of the first deformable section.

[0014] Preferably, the second fixing segment is folded back along the central axis of the balloon toward the direction of the first fixing segment, and the outer side of the second fixing segment is bonded to the outer annular surface of the connecting ring.

[0015] Preferably, the minimum thickness of the first deformation segment is greater than or equal to 0.2 mm, the difference between the thickness of the second deformation segment at one end away from the first deformation segment and the thickness of the first deformation segment is 0.1 mm-0.4 mm; the difference between the thickness of the second deformation segment at one end away from the first deformation segment and the thickness of the third deformation segment at one end away from the second deformation segment is 0.1 mm-0.4 mm.

[0016] Preferably, before the balloon is inflated, the distance from the third deformation segment to the bottom of the concave segment along the axial direction of the connecting ring is 1 mm-2 mm.

[0017] Preferably, the lengths of the first fixing section and the second fixing section along the axial direction of the connecting ring are 1 mm-2 mm.

[0018] Preferably, the radial distance between the first deformation segment and the central axis of the balloon increases gradually in a direction away from the first fixing segment.

[0019] Preferably, before the balloon is inflated, the radial dimension of the balloon is smaller than the radial dimension of the concave area.

[0020] The present application also provides a mesh basket electrode assembly, comprising a mesh basket frame and an electrode body, wherein the electrode body is arranged on the outside of a planar segment on the mesh basket frame.

[0021] Preferably, each of the planar segments is provided with a plurality of electrode bodies spaced apart along its length direction.

[0022] Preferably, the basket electrode assembly also includes the basket bag.

[0023] The present application also provides a basket catheter, comprising the basket electrode assembly.

[0024] Compared with the prior art, the beneficial effects of the present application are as follows: (1) The basket skeleton provided by the present application has a plane section formed by bending the distal end of each strip elastic body radially inward along the connecting ring. Under the action of the plane section, the front end of the basket skeleton is a plane, so that the electrode body mounted thereon forms a surface contact with the part of the human body to be ablated (the traditional spherical contact is a point contact), and the contact area is higher (the more actual contact area, the better). At the same time, since the plane section is arranged radially along the connecting ring, that is, the plane formed by the front end of the basket skeleton is perpendicular to the axial direction of the connecting ring, the vertical support force is larger and more stable, so that it is not easy to produce obvious deformation due to pressure when contacting the part to be ablated. In addition, since the free end of the planar segment is bent toward the proximal direction to form a concave segment and then connected to the connecting ring, each concave segment is used to enclose a concave area, and the connecting ring is located inside the concave area; therefore, under the action of the concave area, when the basket skeleton moves in the human body, the distal end of the strip elastic body or the connecting ring will not produce a protruding structure, let alone a sharp protruding structure, thereby reducing abrupt contact with the discharge site to be ablated, so it will not cause harm to the human body and is safer.

[0025] (2) The balloon provided by the present application, under the effect of the thickness difference of the first deformation segment, the second deformation segment and the third deformation segment on the balloon, when the medium is filled into the balloon to make the balloon full, since the first deformation segment has the smallest thickness and is closer to the proximal end of the strip elastic body, the first deformation segment will be stretched first, thereby causing the first deformation segment to expand and gradually support the strip body; then, since the thickness of the second deformation segment gradually increases in the direction away from the first deformation segment, the thickness of the third deformation segment gradually decreases in the direction away from the second deformation segment, and the minimum thickness of the third deformation segment is greater than or equal to the maximum thickness of the first deformation segment, so there is a point on the first deformation segment whose thickness is the same as the minimum thickness of the third deformation segment (if the minimum thickness of the third deformation segment is equal to the maximum thickness of the first deformation segment, then the point is at the intersection of the second deformation segment and the first deformation segment). Boundary point), that is, with this point as the boundary, when the position of the balloon being stretched and expanded is transferred to this point, the position of the minimum thickness of the third deformation segment (that is, the junction between the third deformation segment and the second fixed segment) begins to produce tensile deformation. At this time, the third deformation segment expands synchronously in the direction of the second deformation segment and the position of the corresponding point on the second deformation segment in the direction of the third deformation segment, so that the second deformation supports the strip elastomer and pulls the third deformation segment to extend radially along the connecting ring first, and finally expands to the outside of the position supporting the concave area formed on the strip elastomer, so that the balloon is finally gradually attached to the inside of the strip elastomer "step by step" to achieve complete fitting. By improving the adhesion of the balloon, the electrode body on the outside of the strip elastomer is better in contact with the position where discharge ablation is required, reducing the diffusion of discharge ablation energy to other useless positions, and achieving efficient discharge conversion.

[0026] (3) The beneficial effects of the basket electrode assembly and the basket catheter are the same as those of the basket frame and the basket balloon, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A stereoscopic diagram of a basket frame provided in this application.

[0028] Figure 2 Provided for this application Figure 1 Cross-section view of the middle basket frame.

[0029] Figure 3 Provided for this application Figure 2 Magnified view of the saccule.

[0030] Figure 4 A cross-sectional view of another balloon provided in the present application.

[0031] Figure 5 A cross-sectional view of another balloon provided in the present application.

[0032] Figure 6 A top view of a basket electrode assembly provided in the present application.

[0033] Figure 7 A cross-sectional view of a partial structure of a basket catheter provided in the present application.

[0034] Figure 8 Provided for this application Figure 7 A partial enlarged view of point I in the middle.

[0035] Fig. 9 Provided for this application Figure 7 A partial enlarged view of point II in the middle.

[0036] Fig.10 Provided for this application Figure 7 Figure 3 shows the state of the balloon after it is inflated.

[0037] Fig.11 Provided for this application Fig.10 A partial enlarged view of point III in the middle.

[0038] Fig.12 Provided for this application Figure 1 Actual picture after the balloon is inflated.

[0039] Fig.13 Provided for this application Figure 4 Actual picture after the balloon is inflated.

[0040] In the figure: 1. basket skeleton; 11. connecting ring; 111. slot; 12. strip elastic body; 121. concave area; 122. plane segment; 13. fixing ring; 14. balloon; 141. first fixing segment; 142. first deformation segment; 143. second deformation segment; 144. third deformation segment; 145. second fixing segment; 2. electrode body; 21. concentric circles; 3. catheter body; 4. medium input catheter; 5. instrument catheter. DETAILED DESCRIPTION

[0041] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0042] In the description of the present application, it should be noted that for directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions and positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present application. The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. The terms "including" and "having" in the specification and claims of the present application and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Embodiment 1

[0044] Reference Figure 1 to Figure 2 One embodiment of the present application provides a basket skeleton 1, comprising a connecting ring 11 and at least three strip elastic bodies 12, wherein the middle portion of the connecting ring 11 is used to form an instrument channel; each strip elastic body 12 is arranged at intervals along the circumferential direction of the connecting ring 11; each strip elastic body 12 is axially divided into a distal end and a proximal end along the connecting ring 11, and the proximal end of each strip elastic body 12 is used to connect to the catheter body 3; the distal end of each strip elastic body 12 is radially bent inward along the connecting ring 11 to form a plane segment 122, the free end of the plane segment 122 is bent toward the proximal direction to form a concave segment and then connected to the connecting ring 11, each concave segment is used to enclose a concave area 121, and the connecting ring 11 is located inside the concave area 121.

[0045] In the basket frame 1 of this embodiment, the distal ends of the strip elastic bodies 12 are bent radially inwardly along the connecting ring 11 to form a plane section 122. Under the action of the plane section 122, the front end (i.e. Figure 2 ) is a plane, so that the electrode body 2 (such as Figure 6As shown in the figure, the flat section 122 forms a surface contact with the part of the human body to be ablated and discharged, and the contact area is higher than that of the traditional spherical contact (i.e., point contact) (the more actual contact area, the better). At the same time, since the plane section 122 is arranged radially along the connecting ring 11, that is, the plane formed at the front end of the basket skeleton 1 is perpendicular to the axial direction of the connecting ring 11, the vertical supporting force is larger and more stable, so it is not easy to produce obvious deformation due to pressure when contacting the part to be ablated and discharged. In addition, since the free end of the flat section 122 is bent in the proximal direction to form a concave section and then connected to the connecting ring 11, each concave section is used to enclose a concave area 121, and the connecting ring 11 is located inside the concave area 121; under the action of the concave area 121, the distal end of the strip elastic body 12 or the connecting ring 11 will not produce a protruding structure, let alone a sharp protruding structure during the movement of the basket skeleton 1 in the human body, thereby reducing the abrupt contact with the part to be ablated and discharged, so it will not cause harm to the human body and has higher safety.

[0046] like Figure 1 As shown, in this embodiment, in order to improve the effect of discharge ablation, the number of the strip-shaped elastic bodies 12 is preferably eight.

[0047] like Figure 8 As shown, in this embodiment, a slot 111 for inserting the distal end is further provided on the end of the connecting ring 11 close to the proximal end of the strip elastic body 12 or the outer wall of the connecting ring 11. The distal end of the strip elastic body 12 is preferably inserted from the end of the connecting ring 11 close to the proximal end of the strip elastic body 12.

[0048] like Figure 2 As shown, in this embodiment, the most suitable distance between the plane section 122 and the connecting ring 11 along the axial direction of the connecting ring 11 is 1mm-2mm. If it is too shallow, the effect of avoiding abrupt contact is not obvious, and if it is too deep, it is easy to cause deformation of the basket frame 1.

[0049] like Figure 2 As shown, in this embodiment, the depth of the concave area 121 along the axial direction of the connecting ring 11 is most suitable when it is 1 / 3-1 / 2 of the radial dimension of the basket frame 1. Under this dimension, the corresponding concave section is least likely to deform in the human body.

[0050] like Figure 2 As shown, in this embodiment, the free end of the planar section 122 is parallel to the axial direction of the connecting ring 11 when being bent toward the proximal direction.

[0051] It is understandable that the proximal end of the strip elastic body 12 can be directly mounted and fixed on the catheter body 3, or the proximal ends of the strip elastic bodies 12 can be first integrated into the fixing ring 13, and then the fixing ring 13 can be mounted and fixed on the catheter body 3.

[0052] Embodiment 2

[0053] Reference Figure 1 and Figure 2 In order to support the basket frame 1, a balloon 14 can be arranged inside each strip elastic body 12. After the balloon 14 is filled, it is used to support each strip elastic body 12, and a clearance channel is provided through the balloon 14 at the position corresponding to the instrument channel. By filling the balloon 14 with a medium (such as liquid or gas) to make the balloon 14 inflated and expanded, each strip elastic body 12 can be supported.

[0054] It should be understood that the present application does not limit the specific structure of the balloon 14 , and only three specific structures (ie, structure one, structure two, and structure three) are provided below for reference.

[0055] Structure 1: Figure 3 As shown, the balloon 14 is an annular structure, and the balloon 14 is divided into a first fixed section 141, a first deformable section 142, a second deformable section 143, a third deformable section 144 and a second fixed section 145 along the proximal to distal direction; the first fixed section 141 is connected to the medium input conduit 4 and forms a seal, and the second fixed section 145 is connected to the connecting ring 11 and forms a seal; the thickness of the first deformable section 142 is equal or the thickness of the first deformable section 142 increases successively in the direction away from the first fixed section 141, and the radial distance between the first deformable section 142 and the central axis of the balloon 14 increases successively in the direction away from the first fixed section 141; the thickness of the second deformable section 143 increases successively in the direction away from the first deformable section 142; the third deformable section 144 is bent toward the inner direction of the balloon 14, the thickness of the third deformable section 144 decreases successively in the direction away from the second deformable section 143, and the minimum thickness of the third deformable section 144 is greater than the maximum thickness of the first deformable section 142.

[0056] The working principle of the balloon 14: combined Figure 2 , Figure 3 as well as Figures 7 to 11, under the effect of the thickness difference between the first deformation segment 142, the second deformation segment 143 and the third deformation segment 144, when the medium is filled into the balloon 14 to fill the balloon 14, since the thickness of the first deformation segment 142 is the smallest and it is closer to the proximal end of the strip elastic body 12, the first deformation segment 142 will be stretched first, so that the first deformation segment 142 expands and gradually supports the strip body; then, since the thickness of the second deformation segment 143 gradually increases in the direction away from the first deformation segment 142, the thickness of the third deformation segment 144 gradually decreases in the direction away from the second deformation segment 143, and the minimum thickness of the third deformation segment 144 is greater than or equal to the maximum thickness of the first deformation segment 142, there is a point on the first deformation segment 142 whose thickness is the same as the minimum thickness of the third deformation segment 144 (if the minimum thickness of the third deformation segment 144 is equal to the minimum thickness of the first deformation segment 144, the thickness of the third deformation segment 144 is equal to the minimum thickness of the third deformation segment 144). 42 has the maximum thickness, then this point is at the intersection of the second deformation segment 143 and the first deformation segment 142), that is to say, with this point as the boundary, when the position of the balloon 14 being stretched and expanded is transferred to this point, the position of the minimum thickness of the third deformation segment 144 (i.e. the intersection between the third deformation segment 144 and the second fixed segment 145) begins to produce tensile deformation, at this time, the third deformation segment 144 expands synchronously in the direction of the second deformation segment 143 and the position of the corresponding point on the second deformation segment 143 expands synchronously in the direction of the third deformation segment 144, so that the second deformation supports the strip-shaped elastic body 12, and pulls the third deformation segment 144 to extend radially along the connecting ring 11 first, and finally expands to the outside of the position of the concave area 121 formed on the supporting strip-shaped elastic body 12, and finally makes the balloon 14 gradually stick to the inner side of the strip-shaped elastic body 12 "step by step" to achieve complete fitting (such as Fig.12 As shown), by improving the close contact of the balloon 14, the electrode body 2 outside the strip elastic body 12 can better contact the position where discharge ablation is required, reducing the diffusion of discharge ablation energy to other useless positions, and achieving efficient discharge conversion.

[0057] like Figure 3 and Figure 8 As shown, the second fixing section 145 is preferably folded back along the central axis of the balloon 14 toward the direction of the first fixing section 141, and the outer side of the second fixing section 145 is bonded to the outer annular surface of the connecting ring 11. Fig.11Under the action of the folding structure, when the third deformation section 144 is stretched and expanded, it will be pressed against the bending direction of the strip elastic body 12, and closely contact the strip elastic body 12, so that the balloon 14 is closely pressed against the inner wall of the strip elastic body 12, supporting and maintaining the shape of the strip elastic body 12, which can not only enhance the strength of the strip elastic body 12 after forming a mesh basket, but also does not change the stereotyped shape of the mesh basket, so that the electrode body 2 is fully in contact with the inner wall of the lesion position, discharge ablation is performed, energy loss is reduced, and the ablation effect is greatly improved. At the same time, with different ring-shaped electrode bodies 2 and a large number of electrode bodies 2, surface ablation is achieved, and a particularly precise point ablation position is not required, which is convenient for users to operate.

[0058] Among them, Figure 3 As shown, preferably, the minimum thickness of the first deformation segment 142 is greater than or equal to 0.2 mm, the difference between the thickness of the second deformation segment 143 away from the first deformation segment 142 and the thickness of the first deformation segment 142 is 0.1 mm-0.4 mm; the difference between the thickness of the second deformation segment 143 away from the first deformation segment 142 and the thickness of the third deformation segment 144 away from the second deformation segment 143 is 0.1 mm-0.4 mm.

[0059] Among them, Figure 3 As shown, the length of the first fixing section 141 and the second fixing section 145 along the axial direction of the connecting ring 11 is preferably 1 mm-2 mm.

[0060] Among them, Figure 8 As shown, before the balloon 14 is filled, the distance from the third deformation segment 144 to the bottom of the inner concave segment along the axial direction of the connecting ring 11 is preferably 1 mm-2 mm, so as to avoid squeezing and friction between the balloon 14 and the inner concave segment before the balloon 14 is filled.

[0061] Among them, Figure 8 As shown, before the balloon 14 is filled, the radial dimension of the balloon 14 is smaller than the radial dimension of the concave area 121. Figure 7 The middle strip-shaped elastic body 12 shrinks and moves closer to the center), at this time, the radial dimension of the balloon 14 is smaller than the radial dimension of the concave area 121, thereby avoiding squeezing friction between the balloon 14 and the strip-shaped elastic body 12.

[0062] Structure 2: Figure 4 As shown, the shape of the balloon 14 is set to match the "ear" shape of the strip elastic body 12, and the position corresponding to the second fixing section 145 does not have a folded structure, which is also the structure that is most easily thought of during the design process. However, after experiments, it was found that although the shape of this structure is more in line with the shape of the strip elastic body 12, during the filling and expansion process, compared with structure one, the "ear" position in structure two is more likely to support the strip elastic body 12 to deformation and poor adhesion, such as Fig.13As shown, either the top of the "ear" of the balloon 14 cannot contact the inner side of the strip elastic body 12, or the two sides of the "ear" of the balloon 14 are not reliable, the gap is large, and the synchronous enlargement can easily stretch the strip elastic body 12 partially to deformation.

[0063] Structure 3: Figure 5 As shown, the balloon 14 is in an ellipsoidal shape before being filled, and its two ends are open mounting structures, and the mounting method is the same as structure 1.

[0064] Embodiment 3

[0065] Reference Figure 1 , Figure 2 and Figure 6 This embodiment provides a basket electrode assembly, including the basket frame 1 and the electrode body 2 in the first embodiment, and the electrode body 2 is suitable for being arranged on the outer side of the plane section 122 on the basket frame 1.

[0066] It should be understood that the installation method of the electrode body 2 and the basket frame 1 and the working principle of the electrode body 2 are all in the prior art and will not be described in detail here.

[0067] In this embodiment, if Figure 6 As shown, each plane segment 122 is provided with a plurality of electrode bodies 2 at intervals along its length direction. At this time, each electrode body 2 located at the same position of each strip elastic body 12 is located on the same concentric circle 21, and each electrode body 2 located at different positions on each strip elastic body 12 is located on concentric circles 21 of different ring shapes, thereby achieving adaptation to different working ranges.

[0068] In this embodiment, the basket electrode assembly may further include any one of the balloons 14 in the second embodiment (ie, the balloon 14 in structure one, structure two, or structure three), preferably the balloon 14 in structure one.

[0069] Embodiment 4

[0070] Reference Figures 7 to 11 The present application also provides a basket catheter, comprising the basket electrode assembly of embodiment three.

[0071] It should be understood that the present application does not limit the specific structure of the basket catheter, and only a specific structure is provided below for reference: the proximal end of each strip elastic body 12 or the fixing ring 13 integrated in each proximal end is fixed to the catheter body 3 of the basket catheter, and a handle is provided at one end of the catheter body 3 away from the strip elastic body 12; the instrument catheter 5 of the basket catheter is inserted into the catheter body 3, the outer wall of one end of the instrument catheter 5 is sealed and connected to the inner wall of the connecting ring 11, and the other end of the instrument catheter 5 is connected to the handle, and the handle has an operating part for operating the instrument catheter 5 to slide relative to the catheter body 3. When the instrument catheter 5 and the catheter body 3 slide relative to each other, the size of the supporting shape of the strip elastic body 12 can be adjusted. A medium input catheter 4 is also provided between the instrument catheter 5 and the catheter body 3, and the outer wall of one end of the medium input catheter 4 close to the connecting ring 11 is bonded to the inner wall of the first fixing section 141, and a gap is formed between the inner wall of the medium input catheter 4 and the outer wall of the instrument catheter 5, through which liquid or gas medium is easily input into the balloon 14 or discharged from the balloon 14.

[0072] It is understandable that the specific structure and working principle of the handle and the operating part are all existing technologies and will not be described in detail here.

[0073] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of protection claimed by the present application. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A net basket balloon, comprising a net basket frame and a balloon arranged inside the net basket frame, characterized in that: The balloon is an annular structure, and is divided into a first fixed section, a first deformable section, a second deformable section, a third deformable section, and a second fixed section along the proximal end to the distal end of the strip-shaped elastic body; the first fixed section is connected to the medium input conduit to form a seal, and the second fixed section is connected to the connecting ring to form a seal; The thickness of the first deformable segments is equal or the thickness of the first deformable segments increases gradually in a direction away from the first fixed segment; the radial distance between the first deformable segments and the central axis of the balloon increases gradually in a direction away from the first fixed segment; The thickness of the second deformation section increases gradually in a direction away from the first deformation section; The third deformation segment is bent toward the inner direction of the balloon, the thickness of the third deformation segment decreases in a direction away from the second deformation segment, and the minimum thickness of the third deformation segment is greater than or equal to the maximum thickness of the first deformation segment; The basket skeleton includes a connecting ring and at least three strip-shaped elastic bodies, the middle portion of the connecting ring is used to form an instrument channel; each of the strip-shaped elastic bodies is arranged at intervals along the circumferential direction of the connecting ring; each of the strip-shaped elastic bodies is axially divided into a distal end and a proximal end along the connecting ring, and the proximal end of each of the strip-shaped elastic bodies is used to connect to the catheter body; the distal end of each of the strip-shaped elastic bodies is radially bent inward along the connecting ring to form a planar section, the free end of the planar section is bent toward the proximal direction to form a concave section and then connected to the connecting ring, each of the concave sections is used to enclose a concave area, and the connecting ring is located inside the concave area.

2. The net basketball bag according to claim 1, characterized in that: The second fixing segment is folded back along the central axis of the balloon toward the direction of the first fixing segment, and the outer side of the second fixing segment is bonded to the outer annular surface of the connecting ring.

3. The net basketball bag according to claim 1, characterized in that: The minimum thickness of the first deformation section is greater than or equal to 0.2 mm, the difference between the thickness of the second deformation section at one end away from the first deformation section and the thickness of the first deformation section is 0.1 mm-0.4 mm; the difference between the thickness of the second deformation section at one end away from the first deformation section and the thickness of the third deformation section at one end away from the second deformation section is 0.1 mm-0.4 mm.

4. The net basketball bag according to claim 1, characterized in that: Before the balloon is filled, the distance from the third deformation section to the bottom of the concave section along the axial direction of the connecting ring is 1 mm to 2 mm; And / or, the lengths of the first fixing section and the second fixing section along the axial direction of the connecting ring are 1 mm-2 mm.

5. The net basketball bag according to claim 1, characterized in that: Before the balloon is inflated, the radial dimension of the balloon is smaller than the radial dimension of the concave area.

6. The net basketball bag according to claim 1, characterized in that: An end of the connecting ring close to the proximal end or an outer side wall of the connecting ring is provided with a slot for connecting to the concave section; And / or, the distance between the plane segment and the connecting ring along the axial direction of the connecting ring is 1 mm-2 mm; And / or, the depth of the concave area along the axial direction of the connecting ring is 1 / 3-1 / 2 of the radial dimension of the basket skeleton.

7. A basket electrode assembly, comprising an electrode body, characterized in that: The basket electrode assembly further comprises a basket bag as described in any one of claims 1 to 6; The electrode body is arranged on the outer side of the plane section on the basket frame.

8. The basket electrode assembly according to claim 7, characterized in that: A plurality of electrode bodies are arranged at intervals on each of the planar segments along the length direction thereof.

9. A basket catheter, characterized in that: Comprising a basket electrode assembly as described in any one of claims 7-8.

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