A medical catheter

Abstract

The application provides a medical catheter, comprising a distal end shaping section and a main body section connected to the proximal end of the distal end shaping section; the distal end shaping section comprises a first outer tube and an inner shaping wire penetrating the first outer tube; the main body section comprises a second outer tube and an inner support member penetrating the second outer tube, the second outer tube is a polymer tube or a braided polymer tube, the second outer tube is connected with the first outer tube, and the inner support member is connected with the inner shaping wire. The medical catheter provided by the application guarantees the controllable performance of the catheter and improves the bending resistance and safety factor. In addition, the distal end of the inner support member is connected with the inner shaping wire of the distal end shaping section, so that the torque transmission of the whole catheter is guaranteed.

Description

Technical Field

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

[0002] A circular lung mapping catheter, with a coiled structure at its distal end, is used in conjunction with a cryoballoon ablation catheter (or other similar catheters) for intracardiac signal mapping (primarily for pulmonary vein mapping). During the procedure, the circular lung mapping catheter is delivered to the heart via the intraluminal channel of the balloon catheter (or the intraluminal channel of another similar catheter). Then, CT and ECG signals are used to locate the pulmonary vein orifices. The circular lung mapping catheter is also used to monitor ECG signals to determine the completion of balloon ablation. Currently available circular lung mapping catheters have the following shortcomings:

[0003] (1) To ensure the control performance of the catheter, the slender main body of the catheter is made of metal, which poses a risk of breakage;

[0004] (2) The catheter has limited functionality and can only be used for two-dimensional display when combined with CT. Summary of the Invention

[0005] The purpose of this invention is to provide a medical catheter to solve one or more problems in the prior art.

[0006] Based on the above ideas, the present invention provides a medical catheter, the medical catheter comprising: a distal shaping segment and a main body segment connected to the proximal end of the distal shaping segment;

[0007] The distal shaping section includes a first outer tube and an inner shaping wire passing through the first outer tube;

[0008] The main body section includes a second outer tube and an inner support member passing through the second outer tube. The second outer tube is a polymer tube or a braided polymer tube. The second outer tube is connected to the first outer tube, and the inner support member is connected to the inner shaping wire.

[0009] Optionally, in the medical catheter, the distal end of the inner support member includes a first tapering segment, and the inner support member is connected to the proximal end of the inner shaping wire through the first tapering segment; the medical catheter also includes a first pair of connectors, and the first tapering segment and the proximal end of the inner shaping wire are connected through the first pair of connectors.

[0010] Optionally, the outer diameter of the first tapered segment is equal to the outer diameter of the proximal end of the inner shaping filament.

[0011] Optionally, in the medical catheter, the first pair of connectors is a metal tube.

[0012] Optionally, in the medical catheter, the inner support is a metal core rod.

[0013] Optionally, in the medical catheter, the distal shaping section further includes a sensor, the inner shaping wire includes a second thinning section, and the sensor is sleeved on the second thinning section; the second outer tube is transitionally connected to the first outer tube to form a docking section, the first outer tube includes a first single-lumen tube, the first single-lumen tube is sleeved on the second thinning section and at least covers the sensor, and the outer diameter of the first single-lumen tube is not greater than the maximum outer diameter of the docking section.

[0014] Optionally, in the medical catheter, the inner shaping wire includes a coiled segment and a straight segment, with the second tapering segment located within the straight segment.

[0015] Optionally, in the medical catheter, the first outer tube further includes a second single-lumen tube and a third single-lumen tube, the second single-lumen tube being sleeved on the coiled segment and extending to the straight rod segment, and the third single-lumen tube being sleeved on at least a portion of the straight rod segment excluding the second tapering segment.

[0016] Optionally, in the medical catheter, the distal shaping section further includes multiple ring electrodes, which are at least spaced apart and sleeved on the second single-lumen tube, wherein the distance between at least one ring electrode and the sensor ranges from 10 to 20 mm.

[0017] Optionally, in the medical catheter, at least one of the ring electrodes is sleeved on the third single-lumen tube, and the distance between the ring electrode sleeved on the third single-lumen tube and the sensor is in the range of 10 to 20 mm.

[0018] Optionally, in the medical catheter, the straight section includes a first straight section and a second straight section, the coiled section, the first straight section and the second straight section are connected in sequence, the second tapering section includes a first part and a second part of equal diameter, the first part is located at the proximal end of the first straight section and the second part is located at the distal end of the second straight section, and the medical catheter also includes a second pair of connectors, the first part and the second part are connected through the second pair of connectors.

[0019] In summary, the medical catheter provided by the present invention includes: a distal shaping segment and a main body segment connected to the proximal end of the distal shaping segment. The distal shaping segment includes a first outer tube and an inner shaping wire passing through the first outer tube. The main body segment includes a second outer tube and an inner support member passing through the second outer tube. The second outer tube is a polymer tube or a braided polymer tube. The second outer tube is connected to the first outer tube, and the inner support member is connected to the inner shaping wire. Compared with the prior art, it has the following beneficial effects:

[0020] (1) The medical catheter provided by the present invention has an outer tube of the main body section that is a polymer tube or a polymer braided tube, which can increase the torsion control and bending resistance of the catheter. In addition, the internal support makes the outer tube of the main body section difficult to break while maintaining the control performance, thus improving safety.

[0021] (2) Furthermore, in the medical catheter provided by the present invention, the distal shaping section further includes a sensor, the inner shaping wire includes a second thinning section, the sensor is sleeved on the second thinning section, the first outer tube includes a first single-lumen tube, the first single-lumen tube is sleeved on the second thinning section and at least covers the sensor, and the outer diameter of the first single-lumen tube is not greater than the maximum outer diameter of the mating section formed by the transition connection between the second outer tube and the first outer tube. That is, without changing the maximum outer diameter of the catheter, space is saved in the distal shaping section by processing the inner shaping wire to install the sensor, and then the magnetoelectric dual positioning technology can be used in combination with existing three-dimensional equipment to realize the three-dimensional display function, thereby improving surgical efficiency and safety. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the use of a loop catheter and a balloon catheter together.

[0023] Figure 2 This is a schematic diagram of the structure of a medical catheter provided in Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the inner guide wire of the medical catheter provided in Embodiment 1 of the present invention;

[0025] Figure 4 for Figure 2 Schematic diagram of the internal structure of region B in the middle;

[0026] Figure 5 for Figure 2 Internal structure diagram of region A in the middle;

[0027] Figure 6 This is a schematic diagram of the structure of a medical catheter provided in Embodiment 2 of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the inner guide wire of the medical catheter provided in Embodiment 2 of the present invention;

[0029] Figure 8 This is a schematic diagram of the straight section of the medical catheter provided in Embodiment 2 of the present invention;

[0030] Figure 9 This is a partial structural diagram of the first outer tube of the medical catheter provided in Embodiment 2 of the present invention;

[0031] The labels in the attached figures are explained as follows:

[0032] 1-Distant shaping section; 2-Main body section; 3-Straight pipe; 4-Socket;

[0033] 100 - Docking section; 101 - First tapering section; 102 - Second tapering section;

[0034] 11-Inner shaping wire; 12-First outer tube;

[0035] 111 - Coil segment; 112 - Straight rod segment; 12a - First single-lumen tube; 12b - Second single-lumen tube; 12c - Third single-lumen tube;

[0036] 13a - Ring electrode; 13b - Sensor; 13c - Ring electrode wire; 13d - Sensor wire;

[0037] 200 - Second pair of takeovers; 201 - First pair of takeovers;

[0038] 21-Second outer tube; 22-Inner support component;

[0039] 112a - First straight segment; 112b - Second straight segment;

[0040] 102a - Part 1; 102b - Part 2. Detailed Implementation

[0041] To make the objectives, advantages, and features of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clearly illustrate the objectives of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and sometimes use different scales. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, steps, etc.

[0042] It should be noted that the medical catheter provided by this invention can be used for pulmonary vein electrocardiogram signal monitoring, and can be used alone or in conjunction with other ablation catheters. For example, such as... Figure 1As shown, this loop catheter (e.g., a loop mapping catheter) can be used in conjunction with a balloon catheter (e.g., a balloon ablation catheter or other similarly structured catheter) to reach the heart through the intraluminal channel of the balloon ablation catheter, helping the balloon ablation catheter locate the pulmonary veins and monitor the ablation effect. This application uses pulmonary vein electrocardiogram signal monitoring as an example; those skilled in the art will understand that this catheter can also be used for mapping other sites, or it can also be applied to ablation of the pulmonary veins or other parts (e.g., radiofrequency, pulsed, microwave, etc.), and this application does not impose any limitations in this regard.

[0043] In this application, "proximal" and "distal" refer to the relative orientation, position, and direction of the components or movements relative to each other from the perspective of the physician using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" usually refers to the end of the medical device that is closer to the physician during normal operation, while "distal" usually refers to the end that first enters the patient's body.

[0044] Example 1

[0045] Please see Figure 2 This embodiment provides a medical catheter, which includes: a distal shaping segment 1 and a main body segment 2 connected to the proximal end of the distal shaping segment 1.

[0046] Please see details. Figure 5 The distal shaping section 1 includes a first outer tube 12 and an inner shaping wire 11 passing through the first outer tube 12;

[0047] Please see details. Figure 4 The main body segment 2 includes a second outer tube 21 and an inner support member 22 passing through the second outer tube. The second outer tube 21 is a polymer tube or a braided polymer tube. The second outer tube 21 is connected to the first outer tube 12. The inner support member 22 is connected to the inner shaping wire 11.

[0048] As mentioned earlier, in the prior art, the main body of the catheter is made of metal, which poses a risk of breakage during operation and has a low safety factor. However, in the medical catheter provided in this embodiment, the second outer tube 21 of the main body 2 is made of polymer tubing or braided polymer tubing, which increases the catheter's torsional control and bending resistance. The inner support member 22, which passes through the second outer tube 21 of the main body 2, maintains the catheter's maneuverability while making the main body 2 less prone to breakage, thus improving safety. In other words, the medical catheter provided in this embodiment, by using polymer tubing or braided polymer tubing in combination with the inner support member 22, improves bending resistance while ensuring that the catheter's maneuverability is not affected, thereby increasing the safety factor. Furthermore, in the medical catheter provided in this embodiment, the distal end of the inner support member 22 is transitionally connected to the inner shaping wire 11 of the distal shaping section 1, thus ensuring the overall torsional control transmission of the catheter.

[0049] Generally, the inner shaping filament 11 is relatively thin. To achieve better bending resistance, the outer diameter of the inner support member 22 should be larger than the outer diameter of the inner shaping filament 11. In this embodiment, preferably, the distal end of the inner support member 22 includes a first tapering segment 101. The inner support member 22 is connected to the proximal end of the inner shaping filament 11 through the first tapering segment 101. The medical catheter also includes a first connector 201. The first tapering segment 101 and the proximal end of the inner shaping filament 11 are connected through the first connector 201. The first connector 201 is sleeved on the first tapering segment 101 and the proximal end of the inner shaping filament 11, and the inner contour of the first connector 201 matches the outer contour of the first tapering segment 101 and the inner shaping filament 11. Furthermore, the outer diameter of the first tapering segment 101 is equal to the outer diameter of the proximal end of the inner shaping filament 11. This design improves the connection stability between the first tapering segment 101 and the proximal end of the inner shaping filament 11. Further preferably, the first connecting tube 201 can be a metal tube, so that after the first tapering section 101 and the proximal end of the inner shaping wire 11 are connected through the first connecting tube 201, they can be fixed by press-fitting or resistance welding to ensure the connection strength of the inner support member 22 and the inner shaping wire 11, thereby ensuring the overall torsion control transmission of the catheter. In other embodiments, the first tapering section 101 and the proximal end of the inner shaping wire 11 can also be directly connected by welding or other methods, and this application is not limited thereto.

[0050] Alternatively, the inner support 22 is a mandrel, such as a metal mandrel, which imparts different operational properties to the conduit by mandrels with different hardness and toughness.

[0051] In this embodiment, the first outer tube 12 of the distal shaping section 1 is a single-lumen tube made of polymer material, and the inner shaping wire 11 is used for shaping and support. Figure 3 The inner shaping wire 11 includes a coil segment 111 and a straight rod segment 112, with the proximal end of the straight rod segment 112 connected to the inner support member 22. Generally, since the rigidity requirement for the straight rod segment 112 is greater than that for the coil segment 111, the outer diameter of the straight rod segment 112 is larger than the outer diameter of the coil segment 111. Both the coil segment 111 and the straight rod segment 112 can be made of nickel-titanium wire, or preferably, the coil segment 111 is made of nickel-titanium wire, while the straight rod segment 112 is made of a support wire with a harderness than nickel-titanium wire, so that the straight rod segment 112 provides good support.

[0052] Since the rigidity requirement for the main body segment 2 is generally greater than that for the distal shaping segment 1, the outer diameter of the main body segment 2 is larger than the outer diameter of the distal shaping segment 1. When the proximal end of the distal shaping segment 1 connects to the main body segment 2, preferably, as follows: Figure 6 As shown, the proximal end of the first outer tube 12 is flared to form a flared section. The first outer tube 12 is fitted onto the distal end of the second outer tube 21 through the flared section, forming a mating section 100, allowing a transitional connection between the first outer tube 12 and the second outer tube 21. Alternatively, the distal end of the second outer tube 21 is narrowed to form a narrowed section. The second outer tube 21 is fitted onto the proximal end of the first outer tube 12 through the narrowed section, forming a mating section 100, allowing a transitional connection between the second outer tube 21 and the first outer tube 12. After the first outer tube 12 and the second outer tube 21 are fitted together, they can be fixed by pressing or resistance welding to ensure the overall torsion control transmission of the catheter. In this embodiment, as... Figure 6 As shown, the connecting section 100 formed by the connection of the first outer tube 12 and the second outer tube 21 is the thickest part of the medical catheter body; that is, the outer diameter of the connecting section 100 is the maximum outer diameter of the medical catheter. Of course, in other embodiments, if the second outer tube 21 is fitted onto the proximal end of the first outer tube 12 through the constricted section, the outer diameter of the second outer tube 21 is the maximum outer diameter of the connecting section 100, which is also the maximum outer diameter of the medical catheter.

[0053] Please continue reading Figure 2In addition to the first outer tube 12 and the inner shaping wire 11 passing through the first outer tube 12, the distal shaping segment 1 also includes a plurality of ring electrodes 13a. These ring electrodes 13a are spaced apart and sleeved on the first outer tube 12 for locating the pulmonary vein orifice, acquiring intracardiac electrical signals, and monitoring ablation. Specifically, the ring electrodes 13a are at least spaced apart on the portion of the first outer tube 12 through which the coil segment 111 passes. That is, all of the ring electrodes 13a may be sleeved on the portion of the first outer tube 12 through which the coil segment 111 passes, or the ring electrodes 13a may be sleeved not only on the portion of the first outer tube 12 through which the coil segment 111 passes, but also on the portion of the first outer tube 12 through which the straight rod segment 112 passes. This application does not impose any limitations on this.

[0054] In addition, please continue to see Figure 2 and combined Figure 5 and Figure 6 In this embodiment, the medical catheter further includes a straightening tube 3 and a socket 4. The socket 4 is connected to the proximal end of the main body segment 2, and the wire 13c of the ring electrode 13a is connected to the socket 4 after passing through the main body segment 2. The straightening tube 3 is sleeved on the main body segment 2, specifically, it is sleeved on the second outer tube 21 of the main body segment 2. The straightening tube 3 is used to change the distal shaping segment 1 from a free state to a controlled shape state (which can be understood as an approximately straight state), so that the distal shaping segment 1 can reach the target tissue through the sheath.

[0055] Furthermore, the medical catheter provided in this embodiment may also include a torsion device (not shown), the proximal end of the straightening tube 3 is connected to the distal end of the torsion device, the torsion device limits the movement of the straightening tube 3 relative to the main body segment 2 by tightening or loosening relative to the main body segment 2, the straightening tube 3 is used to change the distal shaping segment 1 from a free state to an approximately straight state.

[0056] Specifically, the torsion device may include an upper component and a lower component. The distal end of the upper component is connected to the straightening tube 3, specifically, by bonding or heat treatment. The proximal end of the upper component is threadedly connected to the distal end of the lower component. The distal end of the lower component has a multi-lobed structure. When the lower component is tightened relative to the upper component, the multi-lobed structure abuts against the main body segment 2, limiting the movement of the straightening tube 3 relative to the main body segment 2.

[0057] In other embodiments, the torsion device may include an openable component with an opening and a rotating member for changing the size of the opening of the openable component. The rotating member is threadedly connected to the openable component, which is sleeved on the main body segment 2. The rotating member changes the size of the opening by moving relative to the main body segment 2, thereby limiting the movement of the straightening tube 3 relative to the main body segment 2. That is, it is understood that the specific structure of the torsion device does not constitute a limitation of this application.

[0058] The usage process of the medical catheter provided in this embodiment is as follows:

[0059] Loosen the torsion device and move the straightening tube 3 along the main body section 2, and then change the distal shaping section 1 from a free state to an approximately straight state;

[0060] The medical catheter is inserted into the sheath and reaches the target tissue through the sheath. The sheath is then removed, allowing the distal shaping segment 1 to return to its free, ring-shaped state for mapping or ablation of the target tissue.

[0061]

Example 2

[0062] Please see Figure 6 and combined Figure 7 and Figure 8 Unlike Embodiment 1, the medical catheter provided in this embodiment includes a sensor 13b in the distal shaping section 1, and the inner shaping wire 11 includes a second thinning section 102, with the sensor 13b sleeved on the second thinning section 102. The second outer tube 21 is transitionally connected to the first outer tube 12 to form a docking section 100. The first outer tube 12 includes a first single-lumen tube 12a, which is sleeved on the second thinning section 102 and at least covers the sensor 13b. The outer diameter of the first single-lumen tube 12a is not greater than the maximum outer diameter of the docking section 100. The wire 13d of the sensor 13b, after passing through the main body section 2, is connected to the socket 4.

[0063] In this embodiment, the main body segment 2 and other components of the medical catheter, such as the straightening tube 3, the socket 4, the torsion device, and the structure of the inner shaping wire 11 (including the coil segment 111 and the straight rod segment 112), are the same as in Embodiment 1, and will not be described again here.

[0064] The medical catheter provided in this embodiment, without changing the maximum outer diameter of the catheter, saves space for installing the sensor 13b by processing the inner shaping wire 11 in the distal shaping section 1. Through dual positioning with the ring electrode 13a, combined with existing three-dimensional equipment, a three-dimensional display function can be realized, improving surgical efficiency and safety.

[0065] The sensor 13b can be a magnetic positioning sensor, utilizing magneto-electric dual positioning technology, which, combined with existing 3D equipment, can achieve 3D display functionality. In other embodiments, the sensor 13b can also be other sensors that work in conjunction with the ring electrode to perform dual positioning; the specific configuration can be determined according to actual needs, and this application does not impose any limitations on this.

[0066] In this embodiment, the first outer tube 12 further includes a second single-lumen tube 12b and a third single-lumen tube 12c. The second single-lumen tube 12b is sleeved on the coil segment 111 and extends to the straight rod segment 112. The third single-lumen tube 12c is sleeved on at least a portion of the straight rod segment 112 except for the second tapered segment 102. The first outer tube 12 is connected to the second outer tube 21 through the third single-lumen tube 12c.

[0067] In this embodiment, the preferred embodiment is described above (see again). Figure 6 Multiple ring electrodes 13a are at least spaced apart on the second single-cavity tube 12b, wherein the distance between at least one ring electrode 13a and the sensor 13b is in the range of 10 to 20 mm to ensure the accuracy of magneto-electric dual positioning.

[0068] To improve the accuracy of magneto-electric dual positioning, at least one of the ring electrodes 13a is further sleeved on the third single-cavity tube 12c, and the distance between the ring electrode 13a sleeved on the third single-cavity tube 12c and the sensor 13b is in the range of 10-20 mm. That is, at least one ring electrode 13a is provided on each side of the sensor 13b, and the distance between the ring electrode 13a and the sensor 13b should be within a suitable range, thereby improving the accuracy of magneto-electric dual positioning.

[0069] As described in Embodiment 1, the rigidity requirement for the main body segment 2 is generally greater than that for the distal shaping segment 1. Therefore, the outer diameter of the main body segment 2 is larger than the outer diameter of the distal shaping segment 1. When the third single-lumen tube 12c is connected to the second outer tube 21, preferably, the proximal end of the third single-lumen tube 12c is flared to form a flared section. The third single-lumen tube 12c is sleeved onto the distal end of the second outer tube 21 through the flared section, allowing a transitional connection between the third single-lumen tube 12c and the second outer tube 21. Alternatively, the distal end of the second outer tube 21 is narrowed to form a narrowed section. The second outer tube 21 is sleeved onto the proximal end of the third single-lumen tube 12c through the narrowed section, allowing a transitional connection between the third single-lumen tube 12c and the second outer tube 21. Similarly, after the third single-lumen tube 12c and the second outer tube 21 are sleeved together, they can be fixed by pressure gripping or resistance welding to ensure the overall torsion control transmission of the catheter.

[0070] In other words, in this embodiment, the distal shaping segment 1 is matched with different outer tubes according to the dimensions of each segment of the internal shaping component, including a first single-lumen tube 12a, a second single-lumen tube 12b, and a third single-lumen tube 12c. Since the first single-lumen tube 12a is sleeved on the sensor 13b with a relatively large outer diameter, in order to match the internal structure, the outer diameter of the first single-lumen tube 12a is larger than the outer diameters of the second single-lumen tube 12b and the third single-lumen tube 12c. The second single-lumen tube 12b and the third single-lumen tube 12c can have the same outer diameter; or, the second single-lumen tube 12b and the third single-lumen tube 12c can have different outer diameters. To achieve a transition connection, such as... Figure 9 As shown, the two ends of the first single-lumen tube 12a can be narrowed and then fitted onto the second single-lumen tube 12b and the third single-lumen tube 12c, and then the three single-lumen tubes can be fixedly connected by heat fusion. In other embodiments, the second single-lumen tube 12b and the third single-lumen tube 12c can be widened and then fitted onto the two ends of the first single-lumen tube 12a, and then the three single-lumen tubes can be fixedly connected by heat fusion.

[0071] In this embodiment, preferably, the second tapering segment 102 is located at the straight rod segment 112. Specifically, to facilitate the mounting of the sensor 13b, the straight rod segment 112 includes a first straight rod segment 112a and a second straight rod segment 112b. The coil segment 111, the first straight rod segment 112a, and the second straight rod segment 112b are connected sequentially. The second tapering segment 102 includes a first portion 102a and a second portion 102b of equal diameter. The first portion 102a is located at the proximal end of the first straight rod segment 112a, and the second portion 102b is located at the distal end of the second straight rod segment 112b. The medical catheter also includes a second pair of connectors 200, through which the first portion 102a and the second portion 102b are connected. In this embodiment, the first straight rod segment 112a is connected to the coil segment 111. Optionally, the first straight rod segment 112a can be integrally formed with the coil segment 111. Preferably, the second connecting pipe 200 can be a metal pipe, so that after the first part 102a and the second part 102b are connected through the second connecting pipe 200, they can be fixed by press-fitting or resistance welding to ensure the connection strength of the first part 102a and the second part 102b, thereby ensuring the overall torsion control transmission of the conduit. In other embodiments, the first part 102a and the second part 102b can also be directly connected by welding or other methods, and this application is not limited thereto.

[0072] Preferably, the length of the first straight rod segment 112a (including the first portion 102a of the second tapered segment) is greater than 5mm and less than 50mm. This arrangement avoids the connection between the coil segment 111 and the straight rod segment 112 being too thin, resulting in insufficient support and breakage. It also prevents the sensor 13b from being too far from the distal end of the conduit, thus affecting the accuracy of the calibration. As mentioned earlier, the second single-lumen tube 12b is fitted onto the coil segment 111 and extends to the straight rod segment 112. Specifically, the second single-lumen tube 12b is fitted onto the coil segment 111 and extends to the portion of the first straight rod segment 112a excluding the first portion 102a. Correspondingly, at least one ring electrode 13a is fitted onto the portion of the second single-lumen tube 12b that passes through the first straight rod segment 112a. In this embodiment, the third single-lumen tube 12c is sleeved on at least a portion of the straight rod section 112 excluding the second tapered section 102. Specifically, the third single-lumen tube 12c is sleeved on the portion of the second straight rod section 112b excluding the second portion 102b.

[0073] Generally, the straight rod segment 112 needs a certain supporting force. When both the coil segment 111 and the straight rod segment 112 are made of nickel-titanium wire, the outer diameter of the nickel-titanium wire used in the straight rod segment 112 is generally larger than the outer diameter of the nickel-titanium wire used in the coil segment 111. As a result, when the first straight rod segment 112a and the coil segment 111 are integrally formed, the outer diameter of the first straight rod segment 112a is smaller than the outer diameter of the second straight rod segment 112b. Therefore, when forming the second thinning segment 102, the target outer diameter of the second thinning segment 102 can be used to select to only thin the second part 102b, or to simultaneously thin the first part 102a and the second part 102b.

[0074] Specifically, the existing conduit includes a coil segment 111 and a straight rod segment 112. The outer diameter of the coil segment 111 is 0.1–0.4 mm, and the outer diameter of the straight rod segment 112 is 0.4–0.6 mm. To ensure that the outer diameter of the existing hollow sensor 13b, after being fitted onto the second tapered segment 102 and covered by the outer tube, is not greater than the outer diameter of the mating segment, the diameter of the second tapered segment 102 should be 0.2–0.3 mm. If the outer diameter of the coil segment 111 is 0.3–0.4 mm, then when forming the second tapered segment 102, in addition to tapering the second portion 102b at the distal end of the second straight rod segment 112b, the first portion 102a at the proximal end of the first straight rod segment 112a should also be tapered. If the outer diameter of the coil segment 111 is 0.1–0.2 mm, then when forming the second tapered segment 102, only the second portion 102b at the distal end of the second straight rod segment 112b needs to be tapered.

[0075] In some other embodiments, the second thinning segment 102 may be disposed only on the coil segment 111, that is, a certain section of the coil segment 111 is thinned, and the annular electrode 13a is fitted onto the coil segment 111. Although it can also utilize magnetoelectric dual positioning technology and combine with existing three-dimensional equipment to achieve three-dimensional display function, improving surgical efficiency and safety, compared with this embodiment, when the annular electrode 13a is fitted onto the coil segment 111, the bending property of the coil segment 111 increases the difficulty of straightening the straightening tube 3 during use. Therefore, in this embodiment, preferably, the second thinning segment 102 is disposed on the straight rod segment 112.

[0076] In this embodiment, the inner shaping wire 11 can be thinned by grinding to form the second thinned segment 102. In other embodiments, the coil segment 111 and / or the straight rod segment 112 including the second thinned segment 102 can also be directly formed by designing a mold. Specifically, it can be manufactured by the following method: (1) design the corresponding dimensions according to the target structure; (2) make a shaping mold that matches the target structure, and make a groove on the shaping mold that is consistent with the target size, with each groove corresponding to the size of each part; (3) wind the shape memory alloy along the groove and fix it with a fixing bolt; then, after a certain time and temperature of heat treatment, it is rapidly cooled and the fixing bolt is loosened to obtain the desired structure.

[0077] In this embodiment, the coil segment 111 may be a threaded structure, including at least one threaded turn. The proximal end of the coil segment 111 may form an inner hook segment (not shown), which can be transitionally connected to the straight rod segment 112 via a deflection segment (not shown), thereby increasing the catheter's resistance to bending. Preferably, the deflection segment and the inner hook segment have the same radius on the forward projection plane of the coil segment 111, resulting in a smoother transition between the coil segment 111 and the straight rod segment 112, preventing bending of the shaping wire or the catheter tip guide wire, which could reduce the catheter's service life. Further preferably, the distal end of the coil segment 111 is a hook segment (not shown), and the projection of the hook segment on the forward projection plane of the coil segment 111 is located within the coil segment 111. Thus, when the doctor rotates the catheter in reverse, the catheter tip will not insert into the tissue surface, causing tissue damage. Furthermore, during catheter manipulation, the distal end (i.e., the free end) of the coil segment 111 is less likely to become entangled with the coil segment 111, avoiding overlap between electrodes and affecting the acquisition of electrical signals. Additionally, when the coil segment 111 includes the hook segment and the inner hook segment, if the hook segment is compressed and moves towards the straight rod segment 112, the inner hook segment blocks the movement of the hook segment, preventing it from running below the coil segment 111 and intersecting with it. This avoids overlap between the ring electrodes 13a, which could affect the accuracy of mapping or ablation. When the inner shaping wire 11 provided in this embodiment further includes the hook section and the deflection section, the second single-cavity tube 12b is also sleeved on the hook section and the deflection section.

[0078] Because the inner shaping wire 11 is relatively thin, the supporting force may be insufficient to resist the tension of the first outer tube 12. If the inner shaping wire 11 is in a free state and the center line of the straight rod segment 112 coincides with that of the coil segment 111, then after the inner shaping wire 11 is inserted into the first outer tube 12, due to the influence of the hook segment, the straight rod segment 112 no longer coincides with the center line of the coil segment 111. That is, on the orthographic projection plane of the coil segment 111, the straight rod segment 112 deviates from the center of the coil segment 111 and moves to the quadrant where the coil segment 111 overlaps with the quadrant where the hook segment and the inner hook segment are located. In view of this, in this embodiment, preferably, the inner shaping wire 11 is configured such that, in its free state, on the orthographic projection plane of the coil segment 111, the straight rod segment 112 is located in a quadrant of the coil segment 111 that does not overlap with the quadrant where the hook segment and the inner hook segment are located. This ensures that, after the inner shaping wire 11 is inserted into the first outer tube 12, due to the influence of tension, the straight rod segment 112 coincides with the center line of the coil segment 111. The quadrants described in this application are centered on the center of the orthographic projection plane of the coil segment 111, and are divided into several regions by the horizontal and vertical axes; each region is called a quadrant.

[0079] It should be noted that in this embodiment, the distal shaping segment can also be used in combination with other unmodified main segments in the prior art. In this case, although the catheter's resistance to bending is not improved, it can be combined with a three-dimensional device to achieve a three-dimensional display function, thereby improving surgical efficiency and safety.

[0080] In summary, the medical catheter provided by this invention includes: a distal shaping segment and a main body segment connected to the proximal end of the distal shaping segment; the distal shaping segment includes a first outer tube and an inner shaping wire passing through the first outer tube; the main body segment includes a second outer tube and an inner support member passing through the second outer tube, wherein the second outer tube is a polymer tube or a braided polymer tube, the second outer tube is connected to the first outer tube, and the inner support member is connected to the inner shaping wire. The medical catheter provided by this invention ensures that the controllability of the catheter is not affected while also improving its bending resistance and safety factor. Furthermore, because the distal end of the inner support member is transitionally connected to the inner shaping wire of the distal shaping segment, the overall torsional transmission of the catheter can be guaranteed.

[0081] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. In addition, different parts between embodiments can also be combined with each other, and this invention does not limit this.

[0082] Furthermore, it should be understood that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments with equivalent changes, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A medical catheter, characterized in that, The medical catheter includes: a distal shaping segment and a main body segment connected to the proximal end of the distal shaping segment; The distal shaping section includes a first outer tube and an inner shaping wire passing through the first outer tube; The main body section includes a second outer tube and an inner support member passing through the second outer tube. The second outer tube is a polymer tube and is connected to the first outer tube. The inner support member is connected to the inner shaping wire. The distal end of the inner support member includes a first tapering segment, through which the inner support member is connected to the proximal end of the inner shaping wire; the medical catheter also includes a first pair of connectors, through which the first tapering segment and the proximal end of the inner shaping wire are connected.

2. The medical catheter as described in claim 1, characterized in that, The outer diameter of the first tapering segment is equal to the outer diameter of the proximal end of the inner shaping wire.

3. The medical catheter as described in claim 1, characterized in that, The first connecting pipe is a metal pipe.

4. The medical catheter as described in claim 1, characterized in that, The inner support component is a metal core rod.

5. The medical catheter as described in claim 1, characterized in that, The distal shaping section also includes a sensor, the inner shaping wire includes a second thinning section, and the sensor is sleeved on the second thinning section; the second outer tube and the first outer tube are transitionally connected to form a docking section, the first outer tube includes a first single-lumen tube, the first single-lumen tube is sleeved on the second thinning section and at least covers the sensor, and the outer diameter of the first single-lumen tube is not greater than the maximum outer diameter of the docking section.

6. The medical catheter as described in claim 5, characterized in that, The inner shaping wire includes a coil segment and a straight rod segment, and the second thinning segment is located in the straight rod segment.

7. The medical catheter as described in claim 6, characterized in that, The first outer tube further includes a second single-lumen tube and a third single-lumen tube. The second single-lumen tube is sleeved on the coiled segment and extends to the straight rod segment. The third single-lumen tube is sleeved on at least a portion of the straight rod segment, excluding the second tapering segment.

8. The medical catheter as described in claim 7, characterized in that, The distal shaping section further includes multiple ring electrodes, which are at least spaced apart and sleeved on the second single-cavity tube, wherein the distance between at least one ring electrode and the sensor ranges from 10 to 20 mm.

9. The medical catheter as described in claim 8, characterized in that, At least one of the ring electrodes is sleeved on the third single-cavity tube, and the distance between the ring electrode sleeved on the third single-cavity tube and the sensor is in the range of 10~20mm.

10. The medical catheter as claimed in claim 6, characterized in that, The straight rod segment includes a first straight rod segment and a second straight rod segment. The coil segment, the first straight rod segment, and the second straight rod segment are connected in sequence. The second tapering segment includes a first part and a second part of equal diameter. The first part is located at the proximal end of the first straight rod segment, and the second part is located at the distal end of the second straight rod segment. The medical catheter also includes a second pair of connectors. The first part and the second part are connected through the second pair of connectors.

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