A basket catheter

Abstract

This application provides a basket catheter, which includes flexible circuit strips, an elastic support, basket electrodes, and a core rod. The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support, and multiple basket electrodes are disposed on the flexible circuit strips. The basket electrodes can be switched between a contracted state and an expanded state by operating the core rod. The basket electrodes on the inner surface of the elastic support are configured not to contact tissue. Accurate localization of key conduction areas through high-density sampling within the cardiac chambers allows for a clearer elucidation of the arrhythmia matrix, thereby providing better mapping and / or ablation results.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a basket catheter. Background Technology

[0002] Catheter ablation has a low recurrence rate for treating patients with arrhythmias and can effectively improve their quality of life. Currently, high-density mapping catheters are commonly used for intracardiac signal mapping. The basket electrode of a high-density basket mapping catheter includes flexible circuitry and an elastic support, typically using a nickel-titanium alloy as the elastic support. The flexible circuitry is arranged on the outer surface of the elastic support. A core rod is installed inside the catheter; during mapping, the basket electrode is deployed by pulling the core rod to complete contact mapping of the cardiac tissue. Conventional high-density basket catheters are limited by their size, preventing the placement of more electrodes within the flexible circuitry and the inability to install non-contact electrodes on the elastic support to provide more precise mapping. Utility Model Content

[0003] This application provides a basket catheter that, by setting double-sided basket electrodes, enables both contact and non-contact mapping functions, and offers a variety of function combinations to provide better mapping and / or ablation results.

[0004] In a first aspect, embodiments of this application provide a basket guide tube, the basket guide tube comprising a main body section and flexible circuit strips, elastic supports, basket electrodes, and core rods installed on the main body section;

[0005] The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support, and a plurality of the basket electrodes are provided on the flexible circuit strips;

[0006] The basket electrode is switched between a retracted state and an expanded state by manipulating the core rod.

[0007] The basket electrodes on the inner surface of the elastic scaffold are configured not to contact the tissue.

[0008] In one possible implementation, the basket electrode on the inner surface of the elastic scaffold is adapted to acquire non-contact signals, and the basket electrode on the outer surface of the elastic scaffold is adapted to contact the tissue and acquire mapping signals.

[0009] In one possible implementation, the basket electrodes on the inner surface of the elastic scaffold are adapted to acquire non-contact signals, and the basket electrodes on the outer surface of the elastic scaffold are adapted to release radio frequency energy to ablate a portion of the tissue.

[0010] In one possible implementation, the basket conduit includes a fixing member, a fixed base, and a basket spline. The flexible circuit strip and the elastic bracket form the basket spline. The basket spline and the fixing member are both located at the distal end of the fixed base. The distal end of the basket spline has a bendable structure, and the bendable structure is installed between the fixing member and the fixed base.

[0011] In one possible implementation, the distal end of the core rod is fixed to the proximal end of the fixed base. The core rod is driven to move the fixed base toward the proximal end to unfold the basket electrode; the core rod is driven to move the fixed base toward the distal end to retract the basket electrode.

[0012] In one possible implementation, the basket spline further includes an insulating layer, and the basket spline consists of a flexible circuit layer, an insulating layer, an elastic support, an insulating layer, and a flexible circuit layer from the outside to the inside.

[0013] In one possible implementation, a magnetic positioning sensor is also provided inside the fixed base.

[0014] In one possible implementation, the distal end of the fixed base is provided with a slot for mounting the basket spline.

[0015] In one possible implementation, the basket catheter further includes a central electrode disposed at the proximal end of the fixed base and configured to contact the blood and be located away from the contacted tissue area to collect electrical signals away from the contacted tissue area.

[0016] In one possible implementation, the flexible circuit strip includes: a first flexible circuit strip and a second flexible circuit strip; when the basket electrode is in a retracted state, the basket electrode on the first flexible circuit strip is arranged perpendicularly to the basket electrode on the second flexible circuit strip.

[0017] In one possible implementation, the curvature of the distal end of the flexible circuit strip is greater than the curvature of the proximal end.

[0018] In one possible implementation, the number of basket electrodes on the first flexible circuit strip is equal to the number of basket electrodes on the second flexible circuit strip.

[0019] In one possible implementation, the distal end of the core rod is fixed to a fixed base, and the proximal end of the core rod is connected to a push button on the basket guide handle.

[0020] In one possible implementation, the basket conduit further includes a conduit body segment, which is provided with a saline passage.

[0021] Secondly, embodiments of this application provide a basket guide tube, the basket guide tube including a main body section and flexible circuit strips, elastic supports, basket electrodes, and core rods installed on the main body section;

[0022] The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support, and a plurality of the basket electrodes are provided on the flexible circuit strips;

[0023] By manipulating the core rod to pull the flexible circuit strip, the basket electrode can be switched between a contracted state and an expanded state.

[0024] The basket electrodes on the inner and outer surfaces of the elastic support are configured such that discharge occurs between the basket electrodes on the inner surface and the corresponding basket electrodes on the outer surface.

[0025] In summary, the basket catheter provided in this application involves arranging flexible circuit strips on the inner and outer surfaces of an elastic stent, with multiple basket electrodes mounted on these strips. Within the heart chamber, the basket electrodes are deployed via a core rod. The outer surface basket electrodes contact the heart tissue for contact mapping, while the inner surface basket electrodes perform non-contact mapping. The two sets of basket electrodes, vertically arranged on the inner and outer surfaces of this basket catheter, can perform contact and non-contact mapping at the same location, and offer various functional combinations, thereby providing better mapping and / or ablation results. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the deployed state of the basket guide tube provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the basket conduit structure provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the fixing base structure of the basket guide tube provided in the embodiments of this application;

[0031] Figure 4 A cross-sectional view of the basket guide tube structure provided in an embodiment of this application;

[0032] Figure 5This is a schematic diagram of the basket spline structure provided in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of another basket spline structure provided in an embodiment of this application;

[0034] Figure 7 A schematic diagram of the basket electrode provided in an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the basket guide tube being attached to the basket, provided in an embodiment of this application.

[0036] Figure 9 This is a schematic diagram of catheter ablation provided in an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Outer surface flexible circuit strip; 2-Inner surface flexible circuit strip; 3-Elastic support; 4-Central electrode; 5-Core rod;

[0039] 6-Fixing component; 7-Fixing base; 8-Proximal connection section; 10-Cavity body section; 12-Magnetic sensor; 13-Insulation layer;

[0040] 14-Heart chamber tissue; 15-Card slot; 16-Basket electrode; 161-Outer basket electrode; 162-Inner basket electrode. Detailed Implementation

[0041] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0042] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The basket catheter involved in this application is described in the context of patients with arrhythmia. However, it can also be used in the treatment and diagnosis of other diseases. This application does not limit its application to these applications.

[0045] Currently, catheter ablation has a low recurrence rate in the treatment of arrhythmias and can effectively improve the quality of life. Cardiac catheterization therapy requires first inserting a mapping catheter into a specific location within the heart chamber, recording and analyzing the body's electrical phenomena and properties to construct a three-dimensional model of the heart, and then developing a personalized treatment strategy based on these phenomena. Existing techniques commonly use high-density mapping catheters for intracardiac signal mapping.

[0046] High-density mapping refers to a mapping technique that involves collecting and analyzing more than 300 points within a single cardiac chamber via catheter during three-dimensional mapping to elucidate the mechanism of arrhythmia. By accurately locating key conduction areas through high-density sampling within the cardiac chamber, a clearer understanding of the arrhythmia matrix can be achieved, thereby precisely guiding ablation.

[0047] The basket electrode of a high-density basket mapping catheter includes a flexible circuit strip and an elastic support. Nickel-titanium alloy is typically used as the elastic support, but other materials can also be used; this application does not limit the specific materials used. In this application embodiment, the flexible circuit strip is arranged on the outer surface of the elastic support; a core rod is provided inside the catheter. During mapping, the basket electrode is deployed to the cardiac tissue by pulling the core rod inside the catheter to complete contact mapping. Conventional high-density basket catheters are limited by the catheter size, which prevents the arrangement of more electrodes in the flexible circuit strip and the placement of non-contact electrodes on the elastic support to provide more accurate mapping.

[0048] This application provides a basket catheter, which forms a basket spline with double-sided electrodes by arranging flexible circuit strips on the inner and outer surfaces of an elastic stent. Multiple basket electrodes with equal spacing are arranged on the flexible circuit strips. The outer basket electrode on the outer surface contacts the endocardium for contact mapping, while the inner basket electrode on the inner surface performs non-contact mapping. The two basket electrodes, vertically arranged on the inner and outer surfaces of this basket catheter, can provide contact and non-contact mapping in the vertical direction at the same location within the heart chamber, and can offer various functional combinations for better mapping and / or ablation results.

[0049] The basket conduit of the double-sided arranged basket electrodes involved in the embodiments of this application will be described in detail below with reference to specific figures.

[0050] Figure 1 This is a schematic diagram showing the deployed state of the basket guide tube provided in an embodiment of this application. Figure 1 The structure includes an outer surface flexible circuit strip 1, an inner surface flexible circuit strip 2, an elastic support 3, a central electrode 4, and a core rod 5.

[0051] Figure 2 This is a schematic diagram of the basket conduit structure provided in an embodiment of this application. Figure 2 The system includes an outer surface flexible circuit strip 1, an inner surface flexible circuit strip 2, a central electrode 4, a fixing component 6, a fixing base 7, a proximal connection section 8, and a conduit body section 10.

[0052] Figure 3 This is a schematic diagram of the fixing base structure of the basket guide tube provided in an embodiment of this application. Figure 3 The system includes a fixed base 7, a slot 15, and an outer mesh basket electrode 161.

[0053] Figure 4 This is a cross-sectional view of the basket guide structure provided in an embodiment of this application. Figure 4 The components include a central electrode 4, a core rod 5, a fixing component 6, a fixing base 7, a proximal connecting section 8, and a magnetic sensor 12.

[0054] Combination Figure 1 The basket catheter provided in this application embodiment includes a catheter body segment 10 and a flexible circuit strip, an elastic support 3, a basket electrode 16, and a core rod 5 installed on the body segment; the flexible circuit strip is respectively arranged on the inner surface and the outer surface of the elastic support 3, and a plurality of basket electrodes 16 are arranged on the flexible circuit strip; the basket electrodes 16 are switched between a contracted state and an expanded state by operating the core rod 5; the inner basket electrode 162 on the inner surface of the elastic support 3 is configured not to contact the cardiac tissue 14.

[0055] Understandably, the basket electrode 16 includes an outer basket electrode 161 on the outer surface of the flexible circuit strip and an inner basket electrode 162 on the inner surface of the flexible circuit strip.

[0056] In one possible implementation, the inner basket electrode 162 on the inner surface of the elastic scaffold 3 is adapted to acquire non-contact signals, and the outer basket electrode 161 on the outer surface of the elastic scaffold 3 is adapted to contact the tissue and acquire mapping signals. That is, the inner basket electrode 162 on the inner surface of the elastic scaffold 3 is used for non-contact mapping, and the outer basket electrode 161 on the outer surface of the elastic scaffold 3 is used for contact mapping.

[0057] In one possible implementation, the inner basket electrode 162 on the inner surface of the elastic stent 3 is adapted to acquire non-contact signals, and the outer basket electrode 161 on the outer surface of the elastic stent 3 is adapted to release radio frequency energy to ablate a portion of the tissue. That is, the inner basket electrode 162 on the inner surface of the elastic stent 3 is used for non-contact mapping, and the outer basket electrode 161 on the outer surface of the elastic stent 3 is used for discharge ablation.

[0058] In one possible implementation, the flexible circuit strip includes a first flexible circuit strip and a second flexible circuit strip, the first flexible circuit strip being disposed on the outer surface of the elastic support 3 and the second flexible circuit strip being disposed on the inner surface of the elastic support 3.

[0059] It is understood that the first flexible circuit strip includes an outer surface flexible circuit strip 1, and the second flexible circuit strip includes an inner surface flexible circuit strip 2. In the embodiments of this application, there may be multiple first flexible circuit strips, and there may also be multiple second flexible circuit strips.

[0060] In one possible implementation, the number of outer basket electrodes 161 on the first flexible circuit strip is equal to the number of inner basket electrodes 162 on the second flexible circuit strip.

[0061] In one possible implementation, when the basket electrode 16 is in a retracted state, the outer basket electrode 161 on the first flexible circuit strip and the inner basket electrode 162 on the second flexible circuit strip are arranged perpendicularly. That is, they are arranged longitudinally along the direction of the first / second flexible circuit strip.

[0062] In one possible implementation, the curvature of the distal end of the flexible circuit strip is greater than that of the proximal end. One possible curvature variation is that the curvature initially increases sharply from the outside in, then decreases slowly. With this curvature setting, the basket electrode can better conform to the tissue structure when deployed, improving the accuracy of mapping.

[0063] Understandably, in this embodiment, a plurality of basket electrodes 161 are regularly arranged from the distal end to the proximal end on the outer surface flexible circuit strip 1; a plurality of inner layer basket electrodes 162 are regularly arranged from the distal end to the proximal end on the inner surface flexible circuit strip 2. The number of inner and outer surface basket electrodes is preferably 80 to 100. This embodiment does not limit the number of basket electrodes 162; in practical applications, it can be less than 80 or more than 100. Figure 5 The spacing between two adjacent basket electrodes is kept consistent, preferably 0.8 to 1.5 mm, and the size and spacing of the basket electrodes in the inner and outer layers are kept consistent, forming a set of vertically arranged measuring electrodes on the inner and outer surfaces of the elastic support 3.

[0064] In one possible implementation, the basket conduit includes a fixing member 6, a fixed base 7, and a basket spline. The flexible circuit strip and the elastic bracket 3 form the basket spline. The basket spline and the fixing member 6 are both located at the distal end of the fixed base 7. The distal end of the basket spline has a bendable structure, and the bendable structure is installed between the fixing member 6 and the fixed base 7.

[0065] In one possible implementation, the distal end of the core rod 5 is fixed to the proximal end of the fixed base 6. The core rod 5 is driven to move the fixed base 6 toward the proximal end to achieve the unfolding of the basket electrode 16; the core rod 5 is driven to move the fixed base 6 toward the distal end to achieve the retraction of the basket electrode 16.

[0066] In one possible implementation, the distal end of the core rod 5 is fixed to the fixed base 7, and the proximal end of the core rod 5 is connected to the push button of the basket guide handle.

[0067] Understandably, the distal end of the core rod 5 is fixed to the fixed base 7, while the proximal end can be connected to the push button on the handle, allowing the handle to move forward and backward. By pulling the core rod, the fixed base 7 is driven to move closer to the proximal end, thus enabling the expansion and contraction of the basket structure.

[0068] Specifically, in combination Figure 4 The outer surface flexible circuit strip 1 is set on the outer surface of the elastic support 3 to form an outer mesh basket, and the inner surface flexible circuit strip 2 is set on the inner surface of the elastic support 3 to form an inner mesh basket.

[0069] Understandably, in the embodiments of this application, the basket spline composed of the outer surface flexible circuit strip 1, the inner surface flexible circuit strip 2 and the elastic bracket 3 is provided with a bendable structure at its distal end. The bendable structure of the basket spline is fixed between the component fixing member 6 and the fixing base 7. The head end of the fixing member 6 is arc-shaped, which can reduce the trauma caused when the catheter enters the human body.

[0070] In one possible implementation, a magnetic sensor 12 is disposed inside the fixed base 7.

[0071] Specifically, in combination Figure 3 and Figure 4 A magnetic sensor 12 is installed inside the fixed base 7, and a central electrode 4 is installed near the fixed base 7. The magnetic sensor 12 provides a magnetic positioning function, which, combined with the electrical positioning function of the basket electrode 16, allows for real-time confirmation of the position and size changes of the basket electrode 16 in the cardiac tissue 14.

[0072] In one possible implementation, the distal end of the fixed base 7 is provided with a slot 15 for mounting the basket spline.

[0073] In one possible implementation, the proximal end of the basket spline is fixed to the inner wall of the basket conduit connection section.

[0074] Specifically, in combination Figure 3 The far end of the fixed base 7 is provided with 8 slots 15, and the bending area of ​​each basket spline can be installed in the corresponding slot to realize that the splines are regularly arranged along the circumference of the fixing part; the near end of the basket spline is fixed to the inner wall of the connecting section 8.

[0075] In one possible implementation, the basket catheter further includes a central electrode 4 disposed at the proximal end of the fixed base 7 and configured to contact the blood and be located away from the contacted cardiac tissue 14 region, so as to collect electrical signals away from the contacted tissue region.

[0076] Specifically, in combination Figure 4 The central electrode 4 is located near the fixed base 7. The central electrode 4 is configured to allow contact with blood but is far from the contacted cardiac tissue 14 region. It can collect electrical signals transmitted from the blood from regions far from the contacted tissue. In this embodiment, these electrical signals from regions far from the contacted tissue can also be referred to as far-field signals. By contacting the blood, these transmitted electrical signals are received and transmitted to a recording device for analysis. When analyzing complex arrhythmias, far-field signals help distinguish electrical signals from different sources, eliminate interference, and improve the accuracy and reliability of diagnosis.

[0077] In one possible implementation, the basket conduit further includes a conduit body segment 10, which is provided with a saline passage.

[0078] Specifically, in combination Figure 2 The catheter body segment 10 has a saline passage inside for perfusing heparinized saline to prevent thrombosis in the area where the basket spline converges.

[0079] Figure 5This is a schematic diagram of the basket spline structure provided in an embodiment of this application. Figure 5 The system includes an outer surface flexible circuit strip 1, an inner surface flexible circuit strip 2, and an elastic support 3.

[0080] In one possible implementation, the basket spline further includes an insulating layer, and the basket spline, from the outside to the inside, comprises an outer surface flexible circuit layer, an insulating layer, an elastic support 3, an insulating layer, and an inner surface flexible circuit layer. (Combined) Figure 6 Another schematic diagram of a basket spline structure is provided. Figure 6 The structure includes an outer surface flexible circuit strip 1, an inner surface flexible circuit strip 2, an elastic support 3, and an insulating layer 13.

[0081] Specifically, in combination Figure 5 and Figure 6 The basket spline is described in detail, comprising a five-layer structure from the outside in: an outer flexible circuit layer, an insulating layer 13, an elastic support 4, the insulating layer 13 again, and an inner flexible circuit layer. The flexible circuit layer includes an insulating substrate of polyimide, and wires and basket electrodes 16 arranged on the insulating substrate. The surface basket electrodes 16 enable electrical conduction for recording and analyzing the electrical phenomena and properties of organisms. Each flexible circuit strip can be manufactured as an independent component, ensuring that the corresponding flexible circuit strip can be replaced individually in case of electrode failure. The distal bend of the flexible circuit strip is thinner than the proximal bend, facilitating its insertion into the slot of the fixing base. The extended portion of the bend can be bonded to the inner surface of the fixing base using epoxy resin.

[0082] In this embodiment, the insulating layer 13 can be made of PET material, or other materials; this embodiment does not limit the choice. The insulating layer 13 can be a thermoplastic polymer resin shrinkable material. The PET material is heat-shrinked onto the surface of the elastic support to ensure insulation between the flexible circuit strip and the elastic support. Furthermore, the good flexibility of PET material allows for greater bending at the far end of the basket during unfolding, resulting in a larger diameter. The elastic support 3 can be made of materials such as nickel-titanium alloy or PEEK. The aforementioned five-layer structure can be bonded using epoxy resin.

[0083] Figure 7 This is a schematic diagram of the basket electrode provided in an embodiment of this application. Figure 7The system includes an elastic stent 3, an outer mesh basket electrode 161 of a flexible circuit strip, and an inner mesh basket electrode 162 of the flexible circuit strip. In this embodiment, after the distal end of the catheter is inserted into the heart cavity, the mesh basket is unfolded to map the heart cavity tissue. The outer mesh basket electrode 161, located in the mesh basket, contacts the heart cavity tissue 14 for contact mapping. Due to the certain rigidity of the nickel-titanium stent, the mesh basket stent does not undergo significant deformation when in contact with the heart cavity tissue 14. Furthermore, the inner mesh basket electrode 162 is located at the center of the flexible circuit strip and maintains a certain distance from the edge of the spline, so that the inner mesh basket electrode 162 does not contact the heart cavity tissue 14. At this time, the inner mesh basket electrode performs non-contact mapping in the vertical direction. The key signal data is filtered out by combining the mapping data from both.

[0084] Figure 8 This is a schematic diagram showing the attachment of the basket guide tube according to an embodiment of this application. Figure 8 The system includes a central electrode 4, a cardiac cavity tissue 14, and an outer basket electrode 161 for the flexible circuit strip. In this embodiment, the basket spline can be a separate flexible circuit strip. By designing the flexible circuit strip as a multi-layer structure, a thicker polyimide can be used as the intermediate substrate inside the flexible circuit strip to replace the nickel-titanium alloy in Example 1 as the elastic support for the basket. The basket electrodes corresponding to the wiring are arranged on both sides of the substrate.

[0085] This implementation method can reduce the process of bonding the flexible circuit strips of the inner and outer layers to the elastic stent 3 in the above embodiments, and make the area where the basket is bent at the distal end smoother, which is conducive to the distal end of the catheter attaching to the myocardium.

[0086] This application embodiment also provides a basket conduit with double-sided arranged electrodes, wherein the main body section 10 of the basket conduit and the flexible circuit strip, elastic support 3, basket electrode 16 and core rod 5 are installed on the main body section;

[0087] The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support 3, and a plurality of the basket electrodes 16 are provided on the flexible circuit strips;

[0088] By manipulating the core rod 5 to pull the flexible circuit strip, the basket electrode 16 is switched between a contracted state and an expanded state.

[0089] The basket electrodes 16 on the inner and outer surfaces of the elastic support 3 are configured such that the inner basket electrode 161 and the corresponding outer basket electrode 162 discharge between each other.

[0090] The following, combined Figure 9 The provided catheter ablation diagram is explained in detail. Figure 9The device includes an outer basket electrode 161 of a flexible circuit strip, an inner basket electrode 162 of a flexible circuit strip, and cardiac tissue 14. In this embodiment, the inner and outer electrodes of the double-sided basket catheter can be used as ablation electrodes. After the basket electrodes are deployed, the distal region of the basket is attached to the myocardial tissue. At this time, the outer basket electrode 161 on the outer surface can selectively perform bipolar discharge on the corresponding inner basket electrode 162 on the inner surface to ablate the target area. In another embodiment, the outer basket electrode 161 performs unipolar discharge, and the inner basket electrode 162 provides non-contact mapping. The discharge electrodes in this embodiment are independent of each other. One or more discharge electrodes can be selected for discharge ablation while other discharge electrodes do not discharge; alternatively, all electrodes can be selected to discharge simultaneously.

[0091] In addition, in some other typical embodiments, when performing electrophysiological mapping using a high-density basket catheter, the high-density basket catheter is delivered to the patient's heart via femoral vein puncture. The outer basket electrode 161 makes contact mapping with the cardiac tissue 14 to obtain electrocardiogram signals. The high-density basket catheter with inner and outer double electrodes provided in this embodiment has a basket volume similar to that of a conventional basket, and includes two basket electrodes 16 in the vertical direction of the spline. The outer basket electrode 161 makes contact mapping with the cardiac tissue 14, while the inner basket electrode 162 makes contact with the blood in the vertical direction but does not make contact with the cardiac tissue 14 to complete non-contact mapping. The data from both are combined to obtain more accurate electrocardiogram signals.

[0092] In summary, the basket catheter provided in this application embodiment arranges flexible circuit strips on the inner and outer surfaces of the elastic stent 3, with multiple basket electrodes disposed on the flexible circuit strips. Within the cardiac tissue 14, the basket electrodes 16 are deployed via the core rod 5. The outer basket electrode 161 contacts the endocardium for contact mapping, while the inner basket electrode 162 performs non-contact mapping. The two sets of basket electrodes 16, vertically arranged on the inner and outer surfaces of the basket catheter, can perform contact and non-contact mapping at the same location, and offer various functional combinations, thereby providing better mapping and / or ablation results.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed structures can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or modules may be electrical, mechanical, or other forms.

[0094] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0095] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A basket catheter characterized by, The basket guide tube includes a main body section and flexible circuit strips, elastic supports, basket electrodes, and core rods installed on the main body section; The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support, and a plurality of the basket electrodes are provided on the flexible circuit strips; The basket electrode is switched between a retracted state and an expanded state by manipulating the core rod. The basket electrodes on the inner surface of the elastic scaffold are configured not to contact the tissue.

2. The basket catheter of claim 1, wherein, The basket electrode on the inner surface of the elastic scaffold is adapted to acquire non-contact signals, and the basket electrode on the outer surface of the elastic scaffold is adapted to contact the tissue and acquire mapping signals.

3. The basket catheter of claim 1, wherein, The basket electrode on the inner surface of the elastic scaffold is adapted to acquire non-contact signals, and the basket electrode on the outer surface of the elastic scaffold is adapted to release radio frequency energy to ablate a portion of the tissue.

4. The basket guide tube according to claim 1, characterized in that, The basket guide tube includes a fixing component, a fixed base, and a basket spline. The flexible circuit strip and the elastic bracket form the basket spline. The basket spline and the fixing component are both located at the distal end of the fixed base. The distal end of the basket spline has a bendable structure, and the bendable structure is installed between the fixing component and the fixed base.

5. The basket catheter of claim 4, wherein, The distal end of the core rod is fixed to the proximal end of the fixed base. By driving the core rod, the fixed base is driven to move closer to the proximal end, thereby realizing the unfolding of the basket electrode. The core rod is driven to move the fixed base to the distal end, thereby retracting the basket electrode.

6. The basket catheter of claim 4, wherein, The basket spline also includes an insulating layer, and the basket spline consists of a flexible circuit layer, an insulating layer, an elastic support, an insulating layer, and a flexible circuit layer from the outside to the inside.

7. The basket catheter of claim 4, wherein, The fixed base is also equipped with a magnetic positioning sensor.

8. The basket catheter of claim 4, wherein, The far end of the fixed base is provided with a slot for installing the basket spline.

9. The basket guide tube according to any one of claims 4-8, characterized in that, The basket catheter also includes a central electrode, which is located at the proximal end of the fixed base and configured to contact the blood and be located away from the contacted tissue area in order to collect electrical signals away from the contacted tissue area.

10. The basket catheter of any of claims 1-8, wherein, The flexible circuit strip includes: a first flexible circuit strip and a second flexible circuit strip; when the basket electrode is in a retracted state, the basket electrode on the first flexible circuit strip and the basket electrode on the second flexible circuit strip are arranged perpendicularly.

11. The basket catheter of any of claims 1-8, wherein, The curvature of the far end of the flexible circuit strip is greater than that of the near end.

12. A basket catheter characterized by, The basket guide tube includes a main body section and flexible circuit strips, elastic supports, basket electrodes, and core rods installed on the main body section; The flexible circuit strips are respectively arranged on the inner and outer surfaces of the elastic support, and a plurality of the basket electrodes are provided on the flexible circuit strips; By manipulating the core rod to pull the flexible circuit strip, the basket electrode can be switched between a contracted state and an expanded state. The basket electrodes on the inner and outer surfaces of the elastic support are configured such that discharge occurs between the basket electrodes on the inner surface and the corresponding basket electrodes on the outer surface.

Images