CN218045122U - Medical catheter - Google Patents

Abstract

The utility model provides a medical catheter, it includes: the catheter comprises a catheter body, a driving wire and a bending control core, wherein the driving wire is arranged in the catheter body in a penetrating mode, and the bending control core is arranged in the catheter body in a penetrating mode along the axial direction of the catheter body; the driving wire is connected with the far end of the bending control core; the cross section of the bending control core is provided with a first shaft passing through the centroid of the bending control core and a second shaft perpendicular to the first shaft; the bending control core can be bent along the direction of the first shaft and is limited to be bent along the direction of the second shaft under the driving of the driving wire; the bend-controlling core includes a torsion section, the first axis at a proximal cross-section of the torsion section being disposed at an angle to the first axis at a distal cross-section of the torsion section. So the configuration, medical catheter can produce the self deflection when controlling the curved, can more laminate the target area, and medical catheter can arrive different loci simultaneously smoothly from this and carry out work, has solved the problem that medical catheter is difficult to reach a plurality of loci simultaneously among the prior art.

Description

Medical catheter

Technical Field

The utility model relates to the technical field of medical equipment, in particular to medical catheter.

Background

Arrhythmia is a serious challenge in the field of cardiovascular diseases in the 21 st century, and atrial fibrillation is one of the most common arrhythmia diseases in clinic. Catheter ablation therapy is one of effective means for treating atrial fibrillation at present, and a mapping catheter is an important tool for determining a focus source and a treatment scheme by an operator.

The mapping catheter is an interventional medical appliance for collecting intracardiac biological signals and is widely used for cardiac electrophysiological examination and arrhythmia radio frequency ablation. The mapping catheter usually places the site that needs the mapping through femoral vein, superior vena cava puncture and carries out signal extraction, and the mapping catheter that at present domestic clinical commonly used has quadrupole/ten utmost point specification, because the different operation site of needs mapping in the operation process usually, generally will place two mapping catheters at least, and the placing of a plurality of mapping catheters not only makes the operation time increase, increases operation X ray exposure, still can increase patient operation wound quantity.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical catheter to solve the problem that current medical catheter is difficult to reach a plurality of sites simultaneously.

In order to solve the above technical problem, the utility model provides a medical catheter, it includes: the catheter comprises a catheter body, a driving wire and a bending control core, wherein the driving wire is arranged in the catheter body in a penetrating mode, and the bending control core is arranged in the catheter body in a penetrating mode along the axial direction of the catheter body;

the driving wire is connected with the far end of the bending control core;

the cross section of the bending control core is provided with a first axis passing through the centroid of the bending control core and a second axis perpendicular to the first axis; the bending control core can be bent along the direction of the first shaft and is limited to be bent along the direction of the second shaft under the driving of the driving wire;

the bend-controlling core includes a torsion section, the first axis at a proximal cross-section of the torsion section being disposed at an angle to the first axis at a distal cross-section of the torsion section.

Optionally, a moment of inertia of a cross section of the bending-control core to the first axis is smaller than a moment of inertia of a cross section of the bending-control core to the second axis.

Optionally, the bending-control core is in a flat sheet shape, and the thickness direction of the sheet shape is arranged along the first axis; the bending control core has self-recovery elasticity.

Optionally, the bend-controlling core comprises a straight section connected to the torsion section in an axial direction, the first axes at the respective cross sections of the straight section are parallel to each other and to the first axes at the end cross sections of the torsion section connected to the straight section; wherein at least the distal end of the twisted section is connected to the straight section.

Optionally, the bending-control core includes more than two straight sections, and the distal end and the proximal end of the torsion section are respectively connected to one straight section.

Optionally, the medical catheter further comprises an electrode group, the electrode group comprises a plurality of electrodes arranged at intervals along the axial direction of the catheter body, and the electrodes are arranged on the outer peripheral wall of the catheter body; the electrode group is arranged along the axial direction of the catheter body within the range of the axial extension of the straight section.

Optionally, the catheter body comprises a limiting cavity, and the bending control core is accommodated in the limiting cavity; the limiting cavity is used for limiting the position of the bending control core in the catheter body.

Optionally, on the cross section of the catheter body, the length of the limiting cavity in the direction of the second axis is greater than the length of the limiting cavity in the direction of the first axis; the catheter body further comprises a first accommodating cavity, the first accommodating cavity is at least used for accommodating the driving wire, and the first accommodating cavity is located on one side of the limiting cavity along the direction of the first shaft.

Optionally, the medical catheter comprises an electrode lead; the catheter body further comprises a second accommodating cavity for accommodating the electrode lead, and the first accommodating cavity and the second accommodating cavity are respectively positioned on two sides of the limiting cavity along the direction of the first shaft; and the first accommodating cavity and the second accommodating cavity are communicated with the limiting cavity.

Optionally, the centroid of the limiting cavity coincides with the central axis of the catheter body, and the first accommodating cavity and the second accommodating cavity are symmetrically arranged around the limiting cavity.

Optionally, on the cross section of the catheter body, two ends of the limiting cavity in the direction of the second shaft are arc-shaped, and one end of the accommodating cavity, far away from the end connected with the limiting cavity, is arc-shaped.

Optionally, the catheter body comprises an outer tube and a limiting structure, and the bending control core and the limiting structure are accommodated in the outer tube; at least one part of the bending control core is fixedly connected with the outer pipe through the limiting structure.

Optionally, the bending control core includes a fixing section located at the proximal end, the limiting structure includes a glue injection body, and the glue injection body is filled between the fixing section and the outer tube.

Optionally, the medical catheter includes a first sheath tube, the first sheath tube is disposed through the outer tube, the driving wire is disposed through the first sheath tube, and the gel is filled between the first sheath tube and the outer tube.

Optionally, the medical catheter includes an electrode wire and a second sheath tube, the electrode wire is inserted into the second sheath tube, and the first sheath tube and the second sheath tube are arranged on two sides of the fixed section along the direction of the first shaft.

Optionally, the bending-control core comprises a connecting section at the distal end and a main body section 30 connected to the proximal end of the connecting section; the cross-sectional profile of the connecting section is smaller than the distal cross-sectional profile of the main body section 30; the driving wire is connected with the connecting section.

Optionally, the driving wire and the connecting section are welded along the direction of the first shaft.

Optionally, the medical catheter includes a pressing member, and the pressing member is pressed outside a welding position of the driving wire and the connecting section.

Optionally, the medical catheter further comprises a handle and a driving member disposed on the handle; the handle is connected with the near end of the catheter body, and the driving piece is connected with the driving wire; the driving piece is used for driving the driving wire to move along the axial direction so as to drive the catheter body to bend.

To sum up, the utility model provides a medical catheter includes: the catheter comprises a catheter body, a driving wire and a bending control core, wherein the driving wire is arranged in the catheter body in a penetrating mode, and the bending control core is arranged in the catheter body in a penetrating mode along the axial direction of the catheter body; the driving wire is connected with the far end of the bending control core; the cross section of the bending control core is provided with a first axis passing through the centroid of the bending control core and a second axis perpendicular to the first axis; the bending control core can be bent along the direction of the first shaft and is limited to be bent along the direction of the second shaft under the driving of the driving wire; the bending control core includes a torsion section, the first axis at a proximal cross-section of the torsion section being disposed at an angle to the first axis at a distal cross-section of the torsion section.

So dispose, based on the setting of torsion section, medical catheter can produce the self deflection when the accuse is bent, make medical catheter can laminate the structure of target area (like heart) more, medical catheter can arrive different loci simultaneously smoothly from this and carry out work (like the mark survey or melt etc.), solved among the prior art medical catheter and be difficult to reach the problem of a plurality of loci simultaneously, have efficient target in place performance and paste the performance, reduce the time of targetting in place, can reduce operative employee's the operation degree of difficulty simultaneously, efficiency is improved.

Drawings

Those skilled in the art will appreciate that the drawings are provided for a better understanding of the invention and do not constitute any limitation on the scope of the invention. Wherein:

FIG. 1 is a schematic view of a medical catheter in accordance with an embodiment of the present invention;

fig. 2 is a schematic illustration of a cross-section of a catheter body of an embodiment of the invention;

fig. 3 is a schematic view of a cross-section of a medical catheter of an embodiment of the present invention;

fig. 4 is a schematic view of a torsion section of an embodiment of the present invention;

fig. 5 is a schematic view of a bend-controlling core in accordance with an embodiment of the present invention;

fig. 6 is a schematic view of a medical catheter in a bend-controlling state in accordance with an embodiment of the present invention;

FIG. 7 is a schematic view of another orientation of a medical catheter in a bend-controlling state in accordance with an embodiment of the present invention;

FIG. 8 is an enlarged schematic view of a distal portion of FIG. 7;

fig. 9 is a schematic cross-sectional view of another preferred example of a medical catheter of an embodiment of the present invention;

FIG. 10 is a schematic view of another preferred example of a bend-controlling core in accordance with an embodiment of the present invention;

fig. 11 is a schematic view of a combination of a bending control core and a driving wire according to an embodiment of the present invention.

In the drawings:

1-a catheter body; 11-a bend-controlling section; 12-a body section; 13-a limiting cavity; 131-a first region; 132-a second zone; 133-a third region; 14-a first accommodating cavity; 15-a second accommodating cavity; 16-an outer tube; 17-a limit structure; 18-a first sheathing tube; 19-a second sheathing tube; 2-a drive wire; 3-bending control core; 30-a body section; 31-a torsion section; 32-straight section; 33-a connecting segment; 34-a press part; 35-a fixed section; 4-a handle; 41-a driving member; 5-electrode group; 51-an electrode; 52-electrode lead; 53-head electrode.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to scale, and are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a number of" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are present. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or at least two of that feature, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, including not only the endpoints. The terms "proximal" and "distal" are defined herein with respect to a medical catheter having one end for insertion into a human body and a steering end extending out of the body. The term "proximal" refers to a position of the element that is closer to the steering end of the medical catheter from which it extends, and the term "distal" refers to a position of the element that is closer to the end of the medical catheter that is to be inserted into the body, and thus further from the steering end of the medical catheter. Alternatively, in a manual or hand-operated application scenario, the terms "proximal" and "distal" are defined herein with respect to an operator, such as a surgeon or clinician. The term "proximal" refers to a position of an element closer to an operator, and the term "distal" refers to a position of an element closer to a medical catheter and thus further from the operator. Furthermore, as used in the present application, the terms "mounted," "connected," and "disposed" on another element should be construed broadly, and generally only mean that there is a connection, coupling, fit, or drive relationship between the two elements, and that the connection, coupling, fit, or drive between the two elements can be direct or indirect through intervening elements, and should not be construed as indicating or implying any spatial relationship between the two elements, i.e., an element can be located in any orientation within, outside, above, below, or to one side of another element unless the content clearly dictates otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Moreover, directional terminology, such as above, below, up, down, upward, downward, left, right, etc., is used with respect to the exemplary embodiments as they are shown in the figures, with the upward or upward direction being toward the top of the corresponding figure and the downward or downward direction being toward the bottom of the corresponding figure.

An object of the utility model is to provide a medical catheter to solve the problem that current medical catheter is difficult to reach a plurality of sites simultaneously. The following description refers to the accompanying drawings.

The inventor researches and finds that the existing medical catheter is difficult to face the requirement of simultaneously reaching a plurality of sites, for example, when the mapping catheter is threaded to the heart through a blood vessel, because the heart structure of a human body has a specific bending shape, the bending control direction of the mapping catheter is limited (the mapping catheter can be bent towards only one direction), and therefore, the conventional mapping catheter is difficult to be pushed to different mapping sites at one time. For example, in an application scenario, when mapping a coronary sinus and a right atrium simultaneously, if a conventional mapping catheter needs to curve from the right atrium into the coronary sinus, an operator needs to repeatedly rotate the mapping catheter to possibly enter a sinus ostium, which is very difficult, and thus, more than two different mapping catheters are often used to reach different mapping sites through different vascular paths for mapping.

Based on the above research, please refer to fig. 1 to 8, the present invention provides a medical catheter, which is to be explained, the present invention provides a medical catheter not limited to a mapping catheter, but also can reach a plurality of sites simultaneously for other catheters such as an ablation catheter and the like. The medical catheter includes: the catheter comprises a catheter body 1, a driving wire 2 and a bending control core 3, wherein the driving wire 2 is arranged in the catheter body 1 in a penetrating mode, and the bending control core 3 is arranged in the catheter body 1 in a penetrating mode along the axial direction of the catheter body 1; the driving wire 2 is connected with the far end of the bending control core 3; the cross section of the bending control core 3 has a first axis A1 passing through the centroid thereof and a second axis A2 (see FIG. 3) perpendicular to the first axis A1; under the driving of the driving wire 2, the bending control core 3 can bend along the direction of the first axis A1 and is limited to bend along the direction of the second axis A2 (when bending, the bending control core 3 is mainly bent along the first axis A1, and the bending along the first axis A1 is easier than the bending along the second axis A2, so that the bending control core 3 is mainly bent along the first axis A1, but in some application scenes, the bending control core 3 can be forced to bend along the second axis A2, and all the bending control cores 3 are considered to be limited to bend along the direction of the second axis A2); as shown in fig. 4 and 5, the bending control core 3 includes a torsion section 31, and the first axis A1 at the proximal end cross section of the torsion section 31 is arranged at an angle to the first axis A1 at the distal end cross section of the torsion section 31. Preferably, in the axial direction of the torsion section 31, the first shaft A1 at each cross section rotates gradually around the axis of the torsion section 31, that is, the first shaft A1 at each cross section in the axial direction rotates uniformly through a certain circumferential angle, that is, the torsion section 31 generates torsion uniformly in the axial direction, but not abruptly.

Further, the medical catheter further comprises a handle 4 and a driving member 41 (see fig. 1) arranged on the handle; the handle 4 is connected with the proximal end of the catheter body 1, and the driving piece 41 is connected with the driving wire 2; the driving element 41 is used for driving the driving wire 2 to move in the axial direction so as to drive the catheter body 1 to bend. The handle 4 is located at the proximal end of the catheter body 1, and is left outside the human body after the catheter body 1 is inserted into the human body for operation by an operator. Optionally, the catheter body 1 comprises a bending control section 11 at the distal end and a main body section 12 connected to the proximal end of the bending control section 11, and the bending control section 11 and the main body section 12 are connected by glue or welding. The bending control core 3 is mainly located in the bending control section 11, preferably, a part of the proximal end of the bending control core 3 can extend into the main body section 12 to facilitate transition connection, and the driving wire 2 extends to the proximal handle 4 through the bending control section 11 and the main body section 12 to be connected with the driving member. As can be appreciated, as shown in FIG. 6, because the driving wire 2 is connected to the distal end of the bending control core 3, when the bending control core 3 is pulled proximally by the driving member, the bending control core 3 is driven to bend along the first axis A1, and the bending control section 11 is then bent. For convenience of description, an angle between the extending direction of the distal end of the bending control section 11 and the extending direction of the main body section 12 is referred to as a bending control angle, that is, an angle between the head end direction of the bending control section 11 in the initial state when bending is not controlled and the head end direction after bending control, it can be understood that the bending control angle varies with the driving member and the driving wire 2, and the bending control angle is about 270 ° expressed by a dotted line in the example shown in fig. 6.

As shown in fig. 7 and 8, due to the arrangement of the twisting section 31, the catheter body 1 will not bend in the same plane during bending control, but will generate a certain self-deflection, that is, the bending control of the catheter body 1 on both axial sides of the twisting section 31 is not in the same plane, so that the bending control of the catheter body 1 forms a spatial three-dimensional bending form. So the configuration, make medical catheter can more laminate the heart structure, from this medical catheter can reach different mark mapping sites simultaneously smoothly and carry out the mark mapping (mark mapping site such as coronary sinus and Gao Youfang etc.), solved the problem that need place a plurality of medical catheters respectively among the prior art, have the efficient performance of targetting in place and paste the performance, reduce the time of targetting in place, can reduce the operative employee's the operation degree of difficulty simultaneously, improve mark mapping efficiency.

As shown in fig. 4, for convenience of description, an angle between the first axis A1 at the proximal end cross section of the torsion section 31 and the first axis A1 at the distal end cross section of the torsion section 31 is referred to as a torsion angle θ of the torsion section 31; the radial spacing of the distal end of the bend-controlling section 11 after bend control from the central axis of the body section 12 is referred to as the offset distance e. It should be noted that the radial distance is a perpendicular line perpendicular to the main body section 12 at the distal end of the bend-controlling section 11, and a distance along the perpendicular line between the distal end of the bend-controlling section 11 and the central axis of the main body section 12 is an offset distance e. Further, as shown in fig. 4, the lower part of fig. 4 is a proximal end, the upper part is a distal end, and the twisting section 31 is twisted from the proximal end to the distal end along the counterclockwise direction, so as to adapt to the anatomical structure of the heart of the human body, facilitate clinical operation, and avoid unnecessary resistance during the operation. Optionally, the torsion angle θ of the torsion section 31 may be between 10 ° and 40 °, and in practice, the corresponding torsion angle θ may be set according to different mapping points. Preferably, the twist angle θ is preferably 25 °. With such a configuration, when the deflection angle is controlled to be 180-360 degrees, the offset distance e is 10-15 mm. Preferably, when the control angle is 180-270 degrees, the offset distance e is 10-15 mm, which is more beneficial to the positioning of the medical catheter. Of course, in some other application scenarios, the torsion section 31 may also be twisted in a clockwise direction from the proximal end to the distal end, which is not limited in this embodiment.

Optionally, the moment of inertia of the cross section of the bending control core 3 with respect to the first axis A1 is smaller than the moment of inertia of the cross section of the bending control core 3 with respect to the second axis A2, so as to ensure that the bending control core 3 bends along the direction of the first axis A1 when being pulled by the driving wire 2. It is to be understood that the shape of the cross section of the bending control core 3 is not particularly limited in the present embodiment, and the cross sections of various shapes may be provided that the moment of inertia of the first axis A1 is smaller than the moment of inertia of the second axis A2. Alternatively, as shown in fig. 3 and 4, the bending control core 3 has a flat sheet shape, and the thickness direction of the sheet shape is arranged along the first axis A1. In an exemplary embodiment, the bending-controlling core 3 has an oblong rectangular cross section, and the length along the second axis A2 is greater than the length along the first axis A1, and it is obvious that the moment of inertia along the first axis A1 is smaller than the moment of inertia along the second axis A2 according to the calculation formula of the moment of inertia of the rectangular cross section, so that the bending-resistant capability of the bending-controlling core 3 in the first axis A1 is smaller than the bending-resistant capability of the bending-controlling core 3 in the second axis A2, and when subjected to bending stress (such as being pulled by the driving wire 2 or guided by blood vessel tissue), the bending-controlling core 3 will bend in the first axis A1. It is understood that the rectangular cross-section is only one exemplary cross-sectional shape of the bending control core 3, and is not a limitation on the cross-sectional shape of the bending control core 3. In other embodiments, the cross-sectional shape of the bending-control core 3 may also be various suitable shapes such as a rounded rectangle, an oblong ellipse, or a fan-shaped ring, which is not limited by the present invention. Certainly, it is only an exemplary example to make the bending-control core 3 bend along the first axis A1 direction more easily by the way of the moment of inertia, in some other embodiments, the cross section of the bending-control core 3 may also be a cross section with the same moment of inertia in the first axis A1 and the second axis A2 direction, such as a circle, a polygon, and a ring, and at this time, the bending-control core 3 can be bent along the first axis A1 direction more easily by adjusting the way of density distribution, material distribution, and the like of the bending-control core 3 along the cross section, and a person skilled in the art can adjust this according to the prior art, which is not limited by the present invention.

Referring to fig. 5, optionally, the bending control core 3 includes a straight section 32 connected to the torsion section 31 in the axial direction, and the first axes A1 at the cross sections of the straight section 32 are parallel to each other and to the first axes A1 at the end cross sections of the torsion section 31 connected to the straight section 32; wherein at least the distal end of the twisted section 31 is connected to the straight section 32. The first axes A1 at the respective cross-sections of the straight sections 32 are parallel to each other, i.e. the straight sections 32 remain axially untwisted, and therefore the straight sections 32 will remain in the same plane when bent. As for the straight section 32 located at the distal side of the torsion section 31, the end cross section of the torsion section 31 connected thereto means the distal cross section of the torsion section 31, that is, the straight section 32 located at the distal side of the torsion section 31, and the first axis A1 at each cross section thereof is parallel to the first axis A1 at the distal cross section of the torsion section 31. Due to the fact that at least the far end of the torsion section 31 is connected with the straight section 32, the bending control of the far-end straight section 32 can be enabled to deflect relatively when the bending control core 3 is controlled to bend. Preferably, the bending-control core 3 includes more than two straight sections 32, and the distal end and the proximal end of the torsion section 31 are respectively connected to one straight section 32. The number of the torsion sections 31 is not limited in this embodiment, and if the bending-control core 3 includes only one torsion section 31, it is preferable that the bending-control core 3 includes two straight sections 32, which are respectively located at two sides of the torsion section 31 in the axial direction. If the bending control core 3 includes a greater number of torsion sections 31, the torsion sections 31 can be connected by a straight section 32. The number of twisted sections 31, the angle of twist, the length of the straight section 32, the number of straight sections 32, and the like can be configured according to different application scenarios.

Preferably, the bending control core 3 has self-restoring elasticity, and bends under the pulling of the driving wire 2, and when the pulling force of the driving wire 2 is reduced or removed, the bending control core 3 can restore to its original form, such as being linear in the axial direction, based on the self-restoring elasticity. In an alternative example, the bending-control core 3 includes a metal spring made of a metal with a certain deformation resistance, such as nitinol or stainless steel. In practice, the torsion section 31 having a specific torsion angle θ can be formed by performing torsion and shaping processes on a predetermined portion of the metal dome. In one embodiment, the metal elastic sheet is made of a nickel-titanium alloy with certain supporting performance and memory performance, and the metal elastic sheet can be subjected to thermoelastic martensite transformation in a heat treatment mode to generate a memory effect so as to realize shaping. Preferably, the bending-control core 3 further comprises an insulating and lubricating coating coated on the outer side of the metal elastic sheet, so that the whole bending-control core 3 is kept insulated from the catheter body 1.

Optionally, the medical catheter further comprises an electrode group 5, the electrode group 5 comprises a plurality of electrodes 51 arranged at intervals along the axial direction of the catheter body 1, and the electrodes 51 are arranged on the outer peripheral wall of the catheter body 1; the arrangement range of the electrode group 5 along the axial direction of the catheter body 1 does not exceed the axial extension range of the straight section 32. It should be noted that, here, the arrangement range of the electrode group 5 along the axial direction of the catheter body 1 does not exceed the axial extension range of the straight section 32, which means that for a certain electrode group 5, the arrangement area of the electrodes 51 included therein along the axial direction should fall within the axial extension range of the same straight section 32, and should not fall within the axial extension range of different straight sections 32 across the twisted section 31.

Further, the axial arrangement pitch between the plurality of electrodes 51 in each electrode group 5 may be equal or different. The electrode 51 may be, for example, a ring electrode, and in one example, the electrode 51 is a metal electrode, which may be, for example, platinum-iridium alloy or gold. The medical catheter further includes an electrode lead 52, and the electrode lead 52 may be provided in the catheter body 1, for example. The electrodes 51 conduct electrical signals through electrode wires 52 to the proximal handle 4 and further interface with a corresponding mapping device.

Optionally, the medical catheter comprises more than two electrode sets 5. It should be noted that the number of the electrodes 51 included in each different electrode group 5 may be the same or different, and the axial arrangement pitch of the electrodes 51 included in each different electrode group 5 may be the same or different. Preferably, each electrode set 5 corresponds to one flat section 32. In an alternative example, the bending control core 3 comprises two straight sections 32, and accordingly, the medical catheter comprises two electrode sets 5, and the axial distance between the two electrode sets 5 (which refers to the axial distance between the two electrodes 51 closest to the two electrode sets 5) is 35mm to 70mm, so as to adapt to the heart sizes of different people. Preferably, the axial distance between the two electrode sets 5 is 50mm to 60mm, which generally fits the anatomy of an adult human heart. For patients with a large right atrium, the axial distance between the two electrode sets 5 can be extended to 70mm. In particular, the axial distance between two electrode sets 5 does not represent the axial length of the torsion section 31, and the axial length of the torsion section 31 may be equal to or less than the axial distance between two electrode sets 5. Preferably, the axial spacing between the electrodes 51 in each electrode set 5 is smaller than the axial spacing between adjacent electrode sets 5, which is beneficial for improving mapping accuracy and efficiency.

Optionally, the medical catheter further comprises a tip electrode 53 disposed at the distal end of the catheter body 1. Preferably, the head electrode 53 is connected to the bending control core 3 and to the driving wire 2. In one embodiment, the drive wire 2 is attached to the distal end of the bend-controlling core 3 by welding (including but not limited to soldering, laser welding, or resistance welding). Preferably, the driving wire 2 is welded to one side of the bending control core 3 in the direction of the first axis A1 of the bending control core 3. Further, the distal end of the driving wire 2 also extends beyond the distal end of the bending control core 3 and is connected to the tip electrode 53. The driving wire 2 is used not only to drive the bending core 3 to bend but also to transmit an electric signal of the head electrode 53.

Referring to fig. 10 in combination, in another embodiment, bending control core 3 includes a connecting segment 33 at a distal end and a main body segment 30 connected to a proximal end of connecting segment 33, main body segment 30 including the aforementioned straight segment 32 and torsion segment 31; the cross-sectional profile of the connecting section 33 is smaller than the distal cross-sectional profile of the main body section 30; the drive wire 2 is connected to the connecting section 33. Preferably, the drive wire 2 is welded to the connecting section 33 in the direction of the first axis A1. Optionally, the axial length of the connecting section 33 is 5mm to 10mm, and the axial length of the connecting section 33 is adapted to the length of the welding area between the driving wire 2 and the connecting section 33. By adjusting the cross-sectional profile of the connecting section 33 (e.g. by adjusting the width or thickness), the increase in hardness caused by welding of the drive wire 2 can be balanced, ensuring that there is no significant difference between the hardness of the welded portion of the connecting section 33 and the hardness of the body section 30.

Further, in some embodiments, referring to fig. 11, the medical catheter includes a pressing element 34, and the pressing element 34 is pressed outside the welding position of the driving wire 2 and the connecting section 33. In an exemplary embodiment, the pressing member 34 may be a stainless steel tube, and after the driving wire 2 is welded to the connecting section 33, the pressing member 34 can further improve the connecting strength of both the driving wire 2 and the connecting section 33. In another embodiment, the head electrode 53 has a connection hole opened toward the proximal end, and the connection section 33 of the bending control core 3 and the driving wire 2 can be embedded together in the connection hole of the head electrode 53, thereby further improving the connection strength of the connection section 33 and the driving wire 2.

Referring to fig. 2 and 3, optionally, the catheter body 1 includes a limiting cavity 13, and the bending control core 3 is accommodated in the limiting cavity 13; the limiting cavity 13 is used for limiting the position of the bending control core 3 on the catheter body 1. It should be noted that in some embodiments, the cross-sectional shape of the restriction lumen 13 can be slightly larger than the cross-sectional shape of the bending-control core 3, and the bending-control core 3 can easily penetrate from the proximal end of the restriction lumen 13 and can have slight mobility within the confines of the restriction lumen 13. Of course, in other embodiments, the cross section of the limiting cavity 13 can be matched with the cross section shape of the bending control core 3 to reliably limit the movement of the bending control core 3.

Preferably, as shown in fig. 2 and 3, in the cross section of the catheter body 1, the length of the limiting cavity 13 along the second axis A2 is greater than the length along the first axis A1; in an alternative embodiment, the cross section of the limiting cavity 13 is substantially an oblong rectangle, the second axis A2 of the bending control core 3 is arranged along the long side direction of the limiting cavity 13, and both ends of the limiting cavity 13 along the direction of the second axis A2 are arc-shaped (i.e. the short side of the cross section of the limiting cavity 13 is arc-shaped). Preferably, the length of the cross section of the limiting cavity 13 along the first axis A1 is greater than the length of the bending control core 3 along the first axis A1. In this way the bending control core 3 can move slightly in the limiting chamber 13 to adapt the bending and twisting of the bending control section 11. However, the bending control core 3 is roughly positioned in the limit chamber 13 without affecting the driving wire 2 and the electrode lead 52.

Further, the catheter body 1 further includes a first accommodating cavity 14, the first accommodating cavity 14 is at least used for accommodating the driving wire 2, and the first accommodating cavity 14 is located on one side of the limiting cavity 13 along the direction of the first axis A1. In an alternative embodiment, the first receiving chamber 14 has a substantially rectangular cross section, one side of which is in communication with the limiting chamber 13 and the side of which remote from the communication with the limiting chamber 13 is curved. Of course, in other embodiments, the first accommodating cavity 14 may be separated from the limiting cavity 13. Because first holding chamber 14 is located one side of spacing chamber 13 along the direction of primary axis A1, can guarantee that drive silk 2 of wearing to locate in first holding chamber 14 is located one side of accuse curved core 3 along the direction of primary axis A1 all the time, guarantee the relative position of drive silk 2, can ensure the validity of accuse curved, avoid drive silk 2 to cause the accuse curved because of reasons such as winding to be obstructed, guarantee that drive silk 2 is crooked towards the direction of primary axis A1 after exerting pulling force to accuse curved core 3.

Furthermore, the catheter body 1 further includes a second accommodating cavity 15 for accommodating the electrode lead 52, and the first accommodating cavity 14 and the second accommodating cavity 15 are respectively located at two sides of the limiting cavity 13 along the direction of the first axis A1; and the first accommodating cavity 14 and the second accommodating cavity 15 are communicated with the limiting cavity 13. In an alternative embodiment, the second receiving chamber 15 has a substantially rectangular cross section, one side of which is in communication with the limiting chamber 13 and the side of which remote from the communication with the limiting chamber 13 is curved. Of course, in other embodiments, the second accommodating cavity 15 may be separated from the limiting cavity 13. The second receiving chamber 15 is provided to separate the electrode lead 52 from the driving wire 2 and prevent the electrode lead from being tangled with each other. As shown in fig. 2 and 3, in a preferred example, the centroid of the limiting cavity 13 coincides with the central axis of the catheter body 1, the first accommodating cavity 14 and the second accommodating cavity 15 are symmetrically arranged about the limiting cavity 13, and preferably, the first accommodating cavity 14, the second accommodating cavity 15 and the limiting cavity 13 are communicated with each other to form a flower-shaped cavity. It should be noted that, because the number of the electrode wires 52 may be relatively large, in the scheme that the second accommodating cavity 15 is communicated with the limiting cavity 13, the second accommodating cavity 15 is used for accommodating the electrode wires 52 and does not limit that the electrode wires 52 can only penetrate through the second accommodating cavity 15, and a part of the electrode wires 52 may also be disposed in the limiting cavity 13, and after the bending control core 3 penetrates through the limiting cavity 13, the electrode wires 52 are separated from the driving wire 2 by being blocked by the bending control core 3, so that an effect of avoiding mutual entanglement can also be achieved.

More preferably, two sides of the first accommodating cavity 14 are perpendicular to the limiting cavity 13, and two sides of the second accommodating cavity 15 are also perpendicular to the limiting cavity 13. For convenience of description, the limiting chamber 13 is divided into a first region 131, a second region 132 and a third region 133 which are connected in sequence, wherein the second region 132 is a region adjacent to the first accommodating chamber 14 and the second accommodating chamber 15, and the first region 131 and the third region 133 are located at two sides of the second region 132. Preferably, the area of the cross section of the first region 131 and the area of the cross section of the third region 133 are equal and smaller than the area of the cross section of the first accommodation chamber 14 and the area of the cross section of the second accommodation chamber 15.

With the configuration, the internal structures such as the bending control core 3, the electrode lead 52 and the driving wire 2 can be prevented from tangling, and the toughness and the support of the bending control section 11 are ensured, and simultaneously, the inner cavity capacity as large as possible is obtained; the diameter of the bend-controlling section 11 is further reduced while ensuring a constant lumen volume. The flower-shaped cavity formed by the first accommodating cavity 14, the second accommodating cavity 15 and the limiting cavity 13 is approximately positioned in the center of the bending control section 11; because the second axis A2 direction of the bending control core 3 is approximately arranged along the long side of the limit cavity 13, the area of the cross section of the first accommodating cavity 14 and the area of the cross section of the second accommodating cavity 15 are larger, that is, the inertia moment of the cross section of the bending control section 11 relative to the first axis A1 direction is reduced, and the bending control section 11 is also beneficial to bending along the first axis A1 direction.

It should be noted that the first receiving cavity 14, the second receiving cavity 15 and the limiting cavity 13 extend at least in the entire axial direction of the bend-controlling section 11, and may optionally extend to a part or all of the main body section 12, which is not limited in this embodiment. In the axial direction of the bending control section 11, the flower-shaped cavity formed by the first accommodating cavity 14, the second accommodating cavity 15 and the limiting cavity 13 should be adapted to the axial twisting condition of the bending control core 3, that is, in the axial section corresponding to the twisting section 31, the flower-shaped cavity is correspondingly twisted, so that the bending control core 3 is inserted into the limiting cavity 13, and the catheter body 1 and the bending control core 3 are not twisted with each other. In an alternative example, the catheter body 1 is made of a medical polymer material, such as polyurethane and pebax. It may be formed by extrusion or hot blow (reflow) processes. The catheter body 1 has certain flexibility, so that the insertion of the bending control core 3 is convenient, and the intervention of the blood vessel of a human body is also convenient.

Referring to fig. 9 to 11, in another preferred example, the catheter body 1 comprises an outer tube 16 and a limiting structure 17, and the bending control core 3 and the limiting structure 17 are accommodated in the outer tube 16; at least one part of the bending control core 3 is fixedly connected with the outer tube 16 through the limiting structure 17. Due to the complicated manufacture of the tube with flower-shaped cavity, in the preferred embodiment, the catheter body 1 can adopt a single-lumen tube which is easier to process, i.e. the catheter body 1 comprises an outer tube 16, and the bending control core 3 is fixed with the outer tube 16 through an additional limiting structure 17, so as to limit the relative position of the bending control core 3 and the outer tube 16.

Optionally, the bending control core 3 includes a fixing section 35 located at the proximal end, and the limiting structure 17 includes a glue injection body, and the glue injection body is filled between the fixing section 35 and the outer tube 16. In an alternative example, the axial length of the fixation segment 35 is 3mm to 8mm, and its cross-sectional profile is smaller than the proximal cross-sectional profile of the main body segment 30. The glue injection body can be formed by solidification after glue injection. So configured, the fixed section 35 of the bending control core 3 forms a fixed connection with the outer tube 16. Of course, in other embodiments, the limiting structure 17 is not limited to include the injection molding compound, but may be other components such as a snap-fit component. It should be noted that the axial extension length of the injecting body only needs to be slightly greater than the axial length of the fixing section 35, and the entire outer tube 16 does not need to be filled along the entire axial length of the outer tube 16.

Further, the medical catheter comprises a first protecting sleeve 18, the first protecting sleeve 18 is arranged in the outer tube 16 in a penetrating manner, the driving wire 2 is arranged in the first protecting sleeve 18 in a penetrating manner, and the glue injection body is filled between the first protecting sleeve 18 and the outer tube 16. Because the drive silk 2 needs to move along the axial, for avoiding the injecting glue body to fix drive silk 2, can set up first protecting pipe 18 in outer tube 16, wear to locate first protecting pipe 18 with drive silk 2, the injecting glue body is direct not with drive silk 2 contact like this, can guarantee the free activity of drive silk 2 in outer tube 16. In some embodiments, the electrode lead 52 may also be disposed through the first protective sleeve 18. It is certainly preferable that in other embodiments, the medical catheter includes a second protecting tube 19, the electrode wires 52 are inserted into the second protecting tube 19, and the first protecting tube 18 and the second protecting tube 19 are arranged on two sides of the fixing section 35 along the direction of the first axis A1. The first sheath tube 18 and the second sheath tube 19 are separately provided, so that the electrode lead 52 can be prevented from being twisted with the driving wire 2. The first protecting sleeve 18 and the second protecting sleeve 19 are arranged on two sides of the fixed section 35 along the direction of the first axis A1, so that the driving wire 2 can be always positioned on one side of the bending control core 3 along the direction of the first axis A1, the relative position of the driving wire 2 is ensured, and the bending control effectiveness can be ensured.

To sum up, the utility model provides a medical catheter includes: the catheter comprises a catheter body, a driving wire and a bending control core, wherein the driving wire is arranged in the catheter body in a penetrating mode, and the bending control core is arranged in the catheter body in a penetrating mode along the axial direction of the catheter body; the driving wire is connected with the far end of the bending control core; the cross section of the bending control core is provided with a first shaft passing through the centroid of the bending control core and a second shaft perpendicular to the first shaft; the bending control core can be bent along the direction of the first shaft and is limited to be bent along the direction of the second shaft under the driving of the driving wire; the bend-controlling core includes a torsion section, the first axis at a proximal cross-section of the torsion section being disposed at an angle to the first axis at a distal cross-section of the torsion section. So the configuration, based on the setting of torsion section, medical catheter can produce the self deflection when the accuse is bent, make medical catheter can laminate the structure of target area (like heart) more, medical catheter can arrive different loci simultaneously smoothly from this and carry out work (like the mark survey or melt etc.), solved among the prior art medical catheter and be difficult to the problem of a plurality of loci of reacing simultaneously, have the efficient performance of targetting in place and paste the performance, reduce the time of targetting in place, can reduce operative employee's the operation degree of difficulty simultaneously, the efficiency is improved.

It should be noted that, several of the above embodiments may be combined with each other. The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (14)

1. A medical catheter, comprising: the catheter comprises a catheter body, a driving wire and a bending control core, wherein the driving wire is arranged in the catheter body in a penetrating mode, and the bending control core is arranged in the catheter body in a penetrating mode along the axial direction of the catheter body;

the driving wire is connected with the far end of the bending control core;

the cross section of the bending control core is provided with a first shaft passing through the centroid of the bending control core and a second shaft perpendicular to the first shaft; the bending control core can be bent along the direction of the first shaft and is limited to be bent along the direction of the second shaft under the driving of the driving wire;

the bend-controlling core includes a torsion section, the first axis at a proximal cross-section of the torsion section being disposed at an angle to the first axis at a distal cross-section of the torsion section.

2. The medical catheter of claim 1, wherein a moment of inertia of a cross section of the bend-controlling core for the first axis is less than a moment of inertia of a cross section of the bend-controlling core for the second axis.

3. The medical catheter of claim 2, wherein the bending control core is in the form of a flat sheet, the thickness direction of the sheet being arranged along the first axis; the bending control core has self-recovery elasticity.

4. The medical catheter of claim 1, wherein the bend-controlling core comprises, in an axial direction, a straight section connected to the twisted section, the first axes at each cross-section of the straight section being parallel to each other and to the first axes at end cross-sections of the twisted section connected to the straight section; wherein at least the distal end of the twisted section is connected to the straight section.

5. The medical catheter of claim 4, wherein said bending control core comprises more than two of said straight segments, and wherein said distal and proximal ends of said twisted segments are connected to one of said straight segments, respectively.

6. The medical catheter according to claim 4 or 5, further comprising an electrode group including a plurality of electrodes arranged at intervals in an axial direction of the catheter body, the electrodes being disposed on an outer peripheral wall of the catheter body; the electrode group is arranged along the axial direction of the catheter body within the range of the axial extension of the straight section.

7. The medical catheter of claim 1, wherein the catheter body includes a spacing lumen, the bending control core being received within the spacing lumen; the limiting cavity is used for limiting the position of the bending control core in the catheter body.

8. The medical catheter of claim 7, wherein, in a cross-section of the catheter body, a length of the retention lumen in a direction along the second axis is greater than a length in a direction along the first axis; the catheter body further comprises a first accommodating cavity, the first accommodating cavity is at least used for accommodating the driving wire, and the first accommodating cavity is located on one side of the limiting cavity along the direction of the first shaft.

9. The medical catheter of claim 8, wherein the medical catheter comprises an electrode lead; the catheter body further comprises a second accommodating cavity for accommodating the electrode lead, and the first accommodating cavity and the second accommodating cavity are respectively positioned on two sides of the limiting cavity along the direction of the first shaft; and the first accommodating cavity and the second accommodating cavity are communicated with the limiting cavity.

10. The medical catheter of claim 9, wherein the centroid of the limiting cavity coincides with the central axis of the catheter body, and the first receiving cavity and the second receiving cavity are symmetrically arranged about the limiting cavity.

11. The medical catheter of claim 1, wherein the catheter body comprises an outer tube and a stop structure, the bend-controlling core and the stop structure being housed within the outer tube; at least one part of the bending control core is fixedly connected with the outer pipe through the limiting structure; the bending control core comprises a fixing section located at the near end, the limiting structure comprises an injection body, and the injection body is filled between the fixing section and the outer tube.

12. The medical catheter of claim 11, wherein the medical catheter comprises a first sheath tube, wherein the first sheath tube is disposed through the outer tube, wherein the driving wire is disposed through the first sheath tube, and wherein the gel body is filled between the first sheath tube and the outer tube; the medical catheter comprises an electrode wire and a second protecting sleeve, the electrode wire penetrates through the second protecting sleeve, and the first protecting sleeve and the second protecting sleeve are arranged on two sides of the fixed section along the direction of the first shaft.

13. The medical catheter of claim 1, wherein the bending control core comprises a connecting segment at a distal end and a main body segment connected to a proximal end of the connecting segment; the cross-sectional profile of the connecting section is smaller than the distal cross-sectional profile of the main body section; the driving wire is connected with the connecting section.

14. The medical catheter of claim 1, further comprising a handle and a drive member disposed on the handle; the handle is connected with the proximal end of the catheter body, and the driving piece is connected with the driving wire; the driving piece is used for driving the driving wire to move along the axial direction so as to drive the catheter body to bend.

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