CN214965709U

CN214965709U - Medical catheter

Info

Publication number: CN214965709U
Application number: CN202120375248.1U
Authority: CN
Inventors: 汪阮峰; 赵丽; 梁波; 董超
Original assignee: Shanghai Microport EP MedTech Co Ltd
Current assignee: Shanghai Microport EP MedTech Co Ltd
Priority date: 2021-02-09
Filing date: 2021-02-09
Publication date: 2021-12-03
Anticipated expiration: 2031-02-09

Abstract

The utility model provides a medical catheter, include: the adjustable bending section is connected with the far end of the catheter main body section and comprises at least two branch adjustable bending sections, the number of the branch pulling lines is at least two, the near ends of the at least two branch pulling lines penetrate through the inner cavity of the catheter main body section, and the far ends of the at least two branch pulling lines are respectively fixed in the branch adjustable bending sections and used for changing the bending shape of the branch adjustable bending sections. The utility model provides a medical catheter, its distal end include two at least adjustable curved sections in branch, each the adjustable curved section in branch independently controls curved, all the cooperation is controlled curved between the adjustable curved section in branch, can realize that pipe distal end multidimension mark survey and multi-angle paste and lean on to it is more high-efficient to make the mark survey, and is more accurate, and application scope is wider.

Description

Medical catheter

Technical Field

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

Background

In recent years, interventional therapy has been available using medical catheters for treatment of conditions such as cardiac arrhythmias, refractory hypertension, and the like. For example, in the treatment of atrial fibrillation with arrhythmia, a mapping ablation catheter enters the heart through a vein or an artery, maps the heart, finds an abnormal electric signal position or path, and then applies energy to ablate, thereby performing impedance heating on the tissue to generate a non-conductive ablation focus in the tissue, so as to achieve the treatment effect. If the refractory hypertension is treated by renal artery ablation, the ablation catheter enters the connecting artery between the abdominal aorta and the kidney from the artery, and the parasympathetic nerve pathway is blocked by ablation, so that the function of reducing the blood pressure is achieved.

For mapping type catheters, the common functions are: electrocardiosignals are collected, the position of a lesion is searched, a real-time three-dimensional model of the tissue is helped to be established, and the ablation effect of the operation is detected. In order to obtain a catheter with more efficient and accurate monitoring performance, various mapping catheters are put into practical use, and the common modes are as follows:

(1) the number of electrodes is increased, and the signal acquisition efficiency is improved;

(2) the bending shape of the conduit is diversified, and the in-place performance and the attaching performance of the conduit are improved;

(3) the distal end of the catheter has various forms, such as multi-branch shapes, spherical shapes, annular shapes and the like, provides positions for installing more electrodes, and improves the mapping capability of some complex structures.

However, due to the limitation of surgical and processing requirements, the performance improvement mode of a common mapping catheter is relatively single, most of the mapping catheters are selected to be improved under the modes (1) and (2), and the few mapping catheters are improved under the mode (3), but the bending control is limited in a two-dimensional space, so that the applicability of the catheter is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical catheter to solve one or more problems among the prior art.

In order to solve the above technical problem, the utility model provides a medical catheter, include:

a catheter body section;

an adjustable bending section connected with the distal end of the catheter main body section; the adjustable bending section comprises at least two branch adjustable bending sections; and

and the proximal ends of the at least two branch pull wires penetrate out of the inner cavity of the catheter main body section, and the distal ends of the at least two branch pull wires are respectively fixed in the branch adjustable bent sections and used for changing the bending shape of the branch adjustable bent sections.

Optionally, in the medical catheter, the branch bending adjustable section includes a lumen and a stent disposed in the lumen, the stent has a helical deflection, a proximal end of the stent is fixed to a distal end of the catheter main body section, and a distal end of the stent is connected to the branch pull wire.

Optionally, in the medical catheter, when the branch pull wire moves from the distal end to the proximal end of the lumen, the helical state of the stent changes, and the circle diameter of the branch adjustable bending section gradually decreases and the axial height gradually decreases.

Optionally, in the medical catheter, the stent is a sheet-shaped elastic sheet, and the branch stay wire is fixed to the distal end of the lumen.

Optionally, in the medical catheter, the lumen has a helical deflection matching the stent.

Optionally, in the medical catheter, the lumen tube is a single lumen tube, and has a symmetrical irregular hole structure for the branch pull wires and the guide wire bundles to respectively penetrate through from two sides of the stent.

Optionally, in the medical catheter, the parameters of the helical deflection include a helical angle, a helical diameter and a helical length, the helical angle of the stent ranges from 15 degrees to 45 degrees, the helical diameter ranges from 5mm to 60mm, and the helical length ranges from 20mm to 60 mm.

Optionally, in the medical catheter, the medical catheter further includes a stent base disposed at a proximal end of the branch adjustable bending section, and proximal ends of the stents of all the branch adjustable bending sections are fixed to the stent base.

Optionally, in the medical catheter, the stents of all the branch adjustable bending sections are uniformly arranged along the circumferential direction of the stent base.

Optionally, in the medical catheter, when the moving stroke of each branch pull wire is the same, the deflection angle and the deflection direction of each branch adjustable bending section are the same.

Optionally, in the medical catheter, the number of the branch adjustable bending sections is at least 3, the number of the branch pull wires is the same as the number of the branch adjustable bending sections, and after all the branch pull wires move towards the proximal end synchronously, at least 3 branch adjustable bending sections form an S shape in pairs, so that the plurality of branch adjustable bending sections form a distal end acting surface together.

Optionally, in the medical catheter, a plurality of ring electrodes are disposed on each of the branch adjustable bending sections, and the plurality of ring electrodes are sequentially arranged along an axial direction of the branch adjustable bending section.

Optionally, in the medical catheter, the medical catheter further includes a handle assembly disposed at the proximal end of the catheter main body section, the handle assembly includes at least two branch bending control members, and the branch bending control members are connected to the proximal end of each branch pulling wire and are used for controlling the movement of each branch pulling wire in the corresponding branch adjustable bending section to change the bending shape of the corresponding branch adjustable bending section; at least two sliding grooves are formed in the side wall of the handle assembly, and the branch bending control pieces are arranged in the at least two sliding grooves in a sliding mode in a one-to-one correspondence mode.

Optionally, in the medical catheter, the branch bending control member has different gears, and the branch bending control member changes the loop diameter of the corresponding branch adjustable bending section through adjustment of the gears.

Optionally, in the medical catheter, the adjustable bending section further includes a main adjustable bending section, and the main adjustable bending section is located between the catheter main section and the branch adjustable bending section; and the number of the first and second groups,

the medical catheter also comprises a main body pull wire, the proximal end of the main body pull wire penetrates out of the inner cavity of the main body section of the catheter, and the distal end of the main body pull wire is fixed in the main body adjustable bending section and used for changing the bending shape of the main body adjustable bending section;

the medical catheter further comprises a handle assembly arranged at the proximal end of the catheter main body section, the handle assembly comprises a main control bending piece, and the main control bending piece is connected with the proximal end of the main body pull wire and used for controlling the main body pull wire to move in the main body adjustable bending section.

Optionally, in the medical catheter, a moving member with threads is arranged in the handle assembly and is in spiral fit with the main control curved member, the proximal end of the main body pull wire is connected with the moving member, and the main control curved member is rotatably arranged at the proximal end of the handle assembly.

Optionally, in the medical catheter, a head electrode, a plurality of ring electrodes and a sensor are further disposed at a distal end of each of the branch adjustable bending sections, and the sensor is closer to the head electrode than to the ring electrodes.

Optionally, in the medical catheter, the branch adjustable bending section includes a lumen and a stent disposed in the lumen, the sensor is a magnetic positioning sensor, and the sensor is disposed by abutting against the head electrode and the stent.

To sum up, the utility model provides a medical catheter includes: the adjustable bending section is connected with the far end of the catheter main body section and comprises at least two branch adjustable bending sections, the number of the branch pulling lines is at least two, the near ends of the at least two branch pulling lines penetrate through the inner cavity of the catheter main body section, and the far ends of the at least two branch pulling lines are respectively fixed in the branch adjustable bending sections and used for changing the bending shape of the branch adjustable bending sections. Compared with the prior art, the method has the following beneficial effects:

(1) the utility model provides a medical catheter, through each the branch is adjustable to bend the section and is independently controlled curved, and the branch is adjustable to bend the section and coordinate to control curved between, realizes that multidimension degree mark survey and multi-angle paste and lean on to it is more high-efficient to make the mark survey, and is more accurate, and application scope is wider.

(2) Furthermore, the branch bending control component is provided with different gears, so that a plurality of branch bending adjustable sections are distributed in different circle diameters in a three-dimensional space, and the deformation structures are suitable for mapping of patients with different conditions and different structures, and the operation efficiency is improved.

(3) Furthermore, the branch independent bending control design and the pretreatment of the spiral angle of the support elastic sheet in the branch adjustable bending section improve the in-place performance and the attaching performance of the far end of the catheter.

(4) Furthermore, the distributed matching of the plurality of electrodes and the sensors of the plurality of branch adjustable bending sections at the far end of the catheter improves the visualization efficiency of the catheter and provides corresponding support for the required functions of the testing equipment (different functions can be provided according to the types of the branch far end installation elements).

Drawings

Fig. 1 is a schematic overall structural view of a medical catheter according to an embodiment of the present invention;

fig. 2 is a top view of a distal end of a medical catheter provided in accordance with an embodiment of the present invention;

fig. 3 is a longitudinal sectional view of the area a in fig. 2 according to the embodiment of the present invention;

fig. 4 is a cross-sectional view of the area a in fig. 2 according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of C-C' in fig. 2 according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating a change in the curvature of the bracket according to an embodiment of the present invention;

FIG. 7 is a schematic view of the bending variation of the adjustable bending section of the branch according to the embodiment of the present invention;

fig. 8 is a schematic view of the shape of the stent in the embodiment of the present invention;

fig. 9 is a top view of the area D in fig. 2 according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of a handle assembly in an embodiment of the present invention;

fig. 11 is a shape diagram of the matching deformation of the multiple branch adjustable bending sections under different control gears in the embodiment of the present invention;

fig. 12 is a partial schematic structural view of a medical catheter according to an embodiment of the present invention;

fig. 13 is a longitudinal sectional view of the area E in fig. 12 according to the embodiment of the present invention;

fig. 14 is a cross-sectional view of the area E in fig. 12 according to an embodiment of the present invention;

wherein the reference numerals are as follows:

1-a catheter body section; 2-an adjustable bending section; 21-branch adjustable bending section; 31-a branch stay; 211-a lumen tube; 212-a holder; 100-welding spots; 41-head electrode; 42-ring electrode; 43-a sensor; 5-a bracket base; 44-a wire bundle; 441-head electrode lead; 442-sensor wires; 200-protecting the pipe; 6-a handle assembly; 61-branch bend-controlling member; 22-main body adjustable bending section; 7-a transition section; 32-a body pull wire; 221-a bendable sleeve; 62-master control bending piece; 300-a movable member; a 400-T type plug-in; 8-tail socket.

Detailed Description

To make the objects, advantages and features of the present invention clearer, the present invention will be described in 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, but rather are provided for the purpose of facilitating and distinctly claiming 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. It should be further understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and are not intended to imply a logical or sequential relationship between various components, elements, steps, or the like, unless otherwise indicated or indicated.

In this document, "proximal" and "distal" are relative orientations, relative positions, directions of elements or actions with respect to each other from the perspective of a physician using the medical device, although "proximal" and "distal" are not limiting, but "proximal" generally refers to the end of the medical device that is closer to the physician during normal operation, and "distal" generally refers to the end that is first introduced into the patient.

It should be noted that, for convenience of description, the medical catheter is exemplified by a mapping catheter in the following description, but the present application does not limit the medical catheter, and the medical catheter provided by the present invention is also applicable to an ablation catheter or a mapping and ablation integrated catheter. In addition, the design concept of the present application, although originating from cardiac mapping, is also applicable to mapping or ablation of other sites (e.g., esophagus or renal artery), without limitation.

The utility model discloses a core thought lies in providing a medical catheter, this medical catheter is the curved pipe of accuse for the manifold type deformation, the design of pipe distal end has a plurality of branches, a plurality of ring electrodes and sensor can be installed to each branch, improve the precision of mapping, be favorable to three-dimensional visualization, in the in-service use, the art person can regulate and control the shape of pipe distal end according to the inside situation of tissue, satisfy the mapping of different demands, thus, the art person is at the operation in-process, do not need frequent adjustment or change the mapping pipe, when having improved the mapping degree of accuracy, the operation time has been reduced, the efficiency and the security of operation have been improved.

[ EXAMPLES one ]

Based on the above concept, the present embodiment provides a medical catheter, please refer to fig. 1 in combination with fig. 2 and 10, the medical catheter includes:

a catheter body section 1;

the adjustable bending section 2 is connected with the far end of the catheter main body section 1; the adjustable bending section 2 comprises at least two branch adjustable bending sections 21; and

and the proximal ends of the at least two branch pull wires 31 penetrate through the inner cavity of the catheter main body section 1, and the distal ends of the at least two branch pull wires 31 are respectively fixed in the branch adjustable bending sections 21 and are used for changing the bending shape of the branch adjustable bending sections 21.

In the medical catheter provided by the embodiment, the distal end of the medical catheter comprises at least two branch adjustable bending sections 21, each branch adjustable bending section 21 is independently controlled to bend, and all branch adjustable bending sections 21 are matched to control bending, so that multi-dimensional mapping and multi-angle attachment of the distal end of the catheter can be realized, and the mapping is more efficient and accurate, and the application range is wider.

The medical catheter provided in this embodiment is described in further detail below.

Referring to fig. 2, in the present embodiment, a ring electrode 42 is sleeved on each branch adjustable bending section 21, and the ring electrode 42 is used for ensuring accurate positioning, three-dimensional display and signal collection of each branch. In other embodiments, a plurality of electrodes may be disposed along the circumference of the branched adjustable bending section 21 to realize positioning, three-dimensional display and signal collection, which is not limited in this application.

Preferably, a plurality of ring electrodes 42 are sleeved on each branch adjustable bending section 21, and the plurality of ring electrodes 42 are sequentially arranged along the axial direction of the branch adjustable bending section 21, so that the plurality of ring electrodes 42 can be well attached to the tissue, thereby realizing high-density mapping in multiple directions.

In addition, the distal end of each branch adjustable bending section 21 is provided with a head electrode 41, and the head electrode 41 can be a mapping electrode and is used for collecting electrocardiosignals, searching for a lesion position, helping to establish a real-time three-dimensional model of tissues and detecting the surgical ablation effect. However, the present application does not limit that the head electrode 41 is only configured as a mapping electrode, and may be configured as other electrodes, such as an ablation electrode, which is in contact with a vessel wall or tissue and can apply energy for ablation. Those skilled in the art will be able to apply the corresponding description to other types of electrodes and to other fields outside the field of electrophysiology, such as the field of esophageal ablation, with appropriate modifications in detail.

Optionally, referring to fig. 3 and 4, a sensor 43 is further installed in each branch adjustable bending section 21, where the sensor 43 is closer to the distal end of the branch adjustable bending section 21, that is, closer to the head electrode 41, relative to the ring electrode 42, in this embodiment, the sensor 43 is preferably a magnetic positioning sensor, and the catheter of this embodiment, in combination with a three-dimensional display device, can accurately display the position of the head end of each branch adjustable bending section 21, and can also quickly obtain three-dimensional coordinates of different positions in the cardiac chamber, so as to assist positioning and three-dimensional visualization, thereby facilitating quick and accurate modeling of a complex structure, and thus improving positioning accuracy. Further, a magnetic positioning sensor is disposed against the head electrode 41 and the holder 212 to further improve the positioning accuracy, and to display the deflection applied force position, providing more positional information to the operator. In still other embodiments, the sensor 43 may also be another mapping type sensor 43, such as a temperature sensor, for measuring the temperature at the distal end of the catheter. The cooperation of a plurality of the ring electrodes 42 and the sensors 43 can improve the efficiency of catheter visualization and provide corresponding support for the desired functionality of the test device.

Referring to fig. 3 to 5, in the present embodiment, the branched adjustable bending section 21 includes a lumen 211 and a support 212 disposed in the lumen 211. When the catheter bends, the electrode on the catheter only moves on one surface, which is called plane bending control. During the stereocontrol bending, for example, the electrode on the catheter can move on more than two surfaces or dimensions, which is called stereocontrol bending, but in this embodiment, it is preferable that the stent 212 has a spiral deflection, and the stent 212 having the spiral deflection can make the bending transition of the catheter smoother and easier during the stereocontrol bending of each branch adjustable bending section 21, so that different stereocontrol bending effects can be obtained by adjusting the spiral state of the stent 212.

Specifically, the proximal end of the stent 212 may be fixed to the distal end of the catheter main body segment 1, and the distal end of the stent 212 may be connected to the branch pull wire 31, so that when the branch pull wire 31 moves from the distal end to the proximal end of the lumen 211, the helical state of the stent 212 changes, such that the loop diameter of the branch adjustable bending section 21 gradually decreases, and the axial height gradually decreases. The circle diameter of the branch bending-adjustable section 21 can be understood as the radius of an arc line presented by the forward projection surface of the distal end (refer to the forward projection view shown in fig. 2). As shown in fig. 3, the distal end of the bracket 212 may be welded to the branch stay 31 at a weld point 100.

As shown in fig. 6, the stent 212 is made of a metal (such as nitinol) with good recovery, preferably a sheet-shaped elastic sheet, which is heat-treated to spirally deflect at a certain angle, and the branch pull wires 31 are fixed to the distal end of the lumen 211, so that when the branch pull wires move from the distal end to the proximal end of the lumen 211, the spiral state of the stent 212 changes, and further, as shown in fig. 7, the bending shape of each branch adjustable bending section 21 at the distal end of the catheter main body section 1 changes. Specifically, the distal end of the branch pull wire 31 may be welded to the head electrode 41 disposed at the distal end of the lumen 211, so as to ensure the connection stability between the branch pull wire 31 and the stent 212 and the head electrode 41, and the stent 212 and the head electrode 41 may not be connected, which is not limited in this application.

As shown in fig. 8, a cylindrical die may be used to form the stent 212 with some helical deflection. Specifically, the cylindrical mold has a spiral groove with certain spiral parameters, the support 212 in an initial state is fixed in the spiral groove, and then the branches are subjected to a heat treatment-cooling process to present the same spiral parameters, that is, the support is provided with spiral deflection, wherein the parameters of the spiral deflection comprise a spiral angle, a spiral diameter and a spiral length. By varying the groove helix angle, the diameter of the die, stents 212 having different helix angles and helix diameters, as well as helix lengths, can be obtained. In this embodiment, the spiral angle of the support 212 is preferably 15 to 45 degrees, the diameter of the spiral is preferably 5 to 60mm, and the length of the spiral is preferably 20 to 60 mm.

Preferably, the lumen 211 has a helical deflection matching that of the stent 212 to facilitate the placement of the stent 212 and to ensure a smoother and easier bending transition of the branched adjustable bending section 21. Specifically, referring to fig. 4 and 5, the lumen tube 211 is a single lumen tube and has a symmetrical irregular hole structure, that is, the lumen tube 211 has symmetrical irregular holes, which include three parts that are communicated with each other, and are respectively used for the branch pull wire 31, the lead wire bundle 44 and the bracket 212 to pass through along the axial direction of the lumen tube 211, and for the branch pull wire 31 and the lead wire bundle 44 (including the head electrode lead 441 and the sensor lead 442) to pass through from two sides of the bracket 212. That is to say, the portion of the symmetrical special-shaped hole located at least in the middle has a spiral deflection matched with the bracket 212, when the internal structure is arranged, the bracket 212 is located in the middle, the branch guy wire 31 and the wire bundle 44 are respectively located at two sides of the branch, such design is favorable for the stability of three-dimensional bending control, and the catheter is more easily formed into a preset bending shape during bending control, and at the same time, the traction of the branch guy wire 31 to the branch adjustable bending section 21 is not interfered by the wire bundle 44, and accordingly, the wire bundle 44 is not subjected to the acting force of the branch guy wire 31, and the safety is higher. In addition, referring to fig. 13, in order to further ensure the safety, a protective tube 200 may be sleeved on the wire bundle 44.

In this embodiment, preferably, when the moving stroke of each branch pulling wire 31 is the same, the deflection angle and the deflection direction of each branch adjustable bending section 21 are the same, and the number of the branch adjustable bending sections 21 is at least 3, the number of the branch pulling wires 31 is the same as the number of the branch adjustable bending sections 21, and after all the branch pulling wires 31 move towards the proximal end synchronously, the overall longitudinal height of the plurality of branch adjustable bending sections 21 decreases and tends to form a plane (of course, there is no limitation on whether an absolute plane can be formed finally), so that the plurality of branch adjustable bending sections 21 together form a distal end acting surface. In the present embodiment, as shown in fig. 7, as each branch pulling wire 31 moves from the distal end to the proximal end, the entirety of the plurality of branch adjustable bending sections 21 deforms from "claw" to "ring" at the distal end of the catheter main body section 1, the plurality of branch adjustable bending sections 21 form an S shape in pairs, which is suitable for mapping of a specific structure (such as a pulmonary vein ostium, etc.), the entire distal action surface of the prone plane can be more easily attached to the tissue, and the electrodes on each branch adjustable bending section 21 are distributed in different orientations around the connection point of each branch pulling wire 31, so that the mapping and/or ablation surface is more comprehensive, and the mapping and/or ablation effect is improved.

As a preferred embodiment, fig. 7 illustrates that the number of the branch adjustable bending sections 21 is 3, but it should be understood that the number of the branch adjustable bending sections 21 is not limited to 3, and may also be 2, 4, 5, etc. In practical applications, a corresponding number of the branch adjustable bending sections 21 can be selected according to a specific mapping effect desired to be achieved, and considering the influence of the number of the branch adjustable bending sections 21 on the bending shape thereof.

Referring to fig. 9 in combination with fig. 6, the medical catheter provided in this embodiment further includes a stent base 5 disposed at the proximal end of the branch adjustable bending section 21, and the proximal ends of the stents 212 of all the branch adjustable bending sections 21 are fixed to the stent base 5, so as to fix the proximal ends of all the stents 212 at the distal end of the catheter main body section 1. In practice, after each of the branch adjustable bending sections 21 is fixed to the stent base 5, the stent base 5 is fixed to the distal end of the catheter main body section 1. In other embodiments, the fixing of each branch adjustable bending section 21 can be realized by adopting a plurality of stent bases 5 uniformly distributed along the circumference of the catheter main body section 1, which is not limited in the present application. In addition, the brackets 212 of the plurality of branch adjustable bending sections 21 are preferably arranged uniformly along the circumferential direction of the bracket base 5, so that each branch adjustable bending section 21 can achieve the same deflection angle and deflection direction.

Further, referring to fig. 10 in combination with fig. 1, the medical catheter provided in this embodiment further includes a handle assembly 6 disposed at the proximal end of the catheter main body section 1, where the handle assembly 6 includes at least two branch bending control members 61, and the at least two branch bending control members 61 are correspondingly connected to the proximal ends of the at least two branch pulling wires 31 one by one, and are used to control the movement of each branch pulling wire 31 in the corresponding branch adjustable bending section 21, so as to change the bending shape of the corresponding branch adjustable bending section 21.

In this embodiment, the branch bending control member 61 can drive the branch pulling wire 31 to move in the branch adjustable bending section 21 through sliding, so as to change the loop diameter and the axial height of the branch adjustable bending section 21, specifically, at least two sliding grooves are formed on the side wall of the handle assembly 6, and the branch bending control members 61 are correspondingly arranged in the at least two sliding grooves one to one. The branch pulling wire 31 is driven to move in the branch adjustable bending section 21 by the sliding of the branch bending control part 61 in the sliding groove.

Preferably, the branch bending control member 61 has different gears, and the branch bending control member 61 changes the loop diameter of the corresponding branch adjustable bending section 21 through adjustment of the gears. The branch pull wire 31 moves according to corresponding strokes by selecting different gears, so that the branch adjustable bending sections 2 are distributed in different circle diameters in a three-dimensional space, the deformation structures are suitable for mapping of patients with different conditions and different structures, real-time adjustment can be performed according to the size of the pulmonary vein opening of the patient, operation is facilitated, and operation efficiency is improved.

When the bending shape of each support 212 is controlled to be changed from a rod shape to a half-spiral ring through the corresponding branch bending control part 61, as shown in fig. 11, the bending shape of each branch adjustable bending section 21 is changed from the rod shape to the half-spiral ring, so that the far end of the catheter is deformed from the claw shape to the ring shape, the catheter is suitable for mapping of special structures (such as pulmonary orifices) and multi-dimensional mapping and multi-angle attachment are realized, and the mapping is more efficient, more accurate and wider in application range.

When the medical catheter in the embodiment is combined with a radio frequency device, various forms of ablation can be realized according to actual needs. For example, "spot" ablation is achieved with a head electrode; the 'wire' ablation is realized by using a ring electrode on the 'rod-shaped' branch adjustable bending section 21; the loop-shaped branch adjustable bending section 21 can be a complete loop-shaped action surface which is formed by all the branch adjustable bending sections 21 and tends to be a plane, or can be a partial or half loop-shaped action surface which is formed by partial branch adjustable bending sections 21 and can be combined with the above two ablation forms, so that more operation possibilities are provided for a surgeon.

[ example two ]

Based on the same idea, the present embodiment provides another medical catheter, which is different from the above embodiment that the adjustable bending section 2 further comprises a main adjustable bending section 22, please refer to fig. 1, wherein the main adjustable bending section 22 is located between the main catheter body section 1 and each of the branch adjustable bending sections 21.

According to the medical catheter provided by the embodiment, on the basis that bending control is independently performed on each branch adjustable bending section 21 and a plurality of branch adjustable bending sections 21 are matched with bending control, bending control is performed on the whole main body adjustable bending section 22, and the in-place performance and the attaching performance of the catheter are improved.

As shown in fig. 12, in order to facilitate the arrangement of the internal structure of the catheter (the branch wires 31, the wire bundle 44, the stent 212, etc.), preferably, the medical catheter provided in this embodiment further includes a transition section 7, and the connection between the main adjustable bending section 22 and each of the branch adjustable bending sections 21 is realized through the transition section 7. In actual operation, after each branch adjustable bending section 21 is fixed to the support base 5, the support base 5 is fixed to the far end of the transition section 7.

Referring to fig. 10 in conjunction with fig. 13, the medical catheter further includes a main body pulling wire 32, a proximal end of the main body pulling wire 32 penetrates through the inner cavity of the main body segment 1 of the catheter, and a distal end of the main body pulling wire 32 is fixed in the main body adjustable bending segment 22 for changing the bending shape of the main body adjustable bending segment 22.

Specifically, the main body adjustable bending section 22 includes a bendable sleeve 221, such as a spring sleeve, sleeved on the main body pull wire 32, and the main body pull wire 32 controls the bending change of the bendable sleeve 221 through movement, so as to control the bending change of the main body adjustable bending section 22. In other embodiments, similar to the branched adjustable bending section 21, the main adjustable bending section 22 may also use a helically deflected stent to achieve the bending change, and the main pull wire 32 is connected to the distal end of the stent located in the main adjustable bending section 22 to control the bending of the main adjustable bending section 22 by moving.

Further, in addition to the branch bending control member 61 described in the first embodiment, referring to fig. 10, in this embodiment, the handle assembly 6 further includes a main control bending member 62, and the main control bending member 62 is connected to the proximal end of the main body pulling wire 32 and is used for controlling the movement of the main body pulling wire 32 in the main body adjustable bending section 22.

Optionally, a movable member 300 with threads is disposed in the handle assembly 6, for example, a movable bolt, the movable member 300 is spirally engaged with the main control curved member 62, the proximal end of the main body pull wire 32 is connected to the movable member 300, the main control curved member 62 is rotatably disposed at the proximal end of the handle assembly 6, and when the main control curved member 62 rotates, the movable member 300 can be driven to move, so as to drive the main body pull wire 32 to move in the main body adjustable curved section 22.

In other embodiments, other control mechanisms may be provided, for example, the main body pulling wire 32 may be controlled by a sliding member, or a general control bending member may be adopted, and the main body pulling wire 32 and the branch pulling wires 31 are moved by different buttons or knob switches on the general control bending member, so as to accomplish the respective control of the bending of the main body adjustable bending section 22 and each branch adjustable bending section 21, which is not limited by the present invention.

In addition, referring to fig. 13 and 14, preferably, the main body adjustable bending section 22 has a plurality of cavities passing through in the axial direction, and is used for the main body pulling wire 32 and the plurality of branch pulling wires 31 to respectively pass through, so as to prevent the main body pulling wire 32 and the plurality of branch pulling wires 31 from being intertwined with each other, which results in the breakage of the pulling wires during the bending control process and affects the performance of the whole catheter. That is, the number of the chambers of the adjustable bending section 2 is not less than the total number of the main body pulling wire 32 and the branch pulling wires 31, and the main body pulling wire 32 and the branch pulling wires 31 respectively pass through one of the chambers. For the branch adjustable bending section 21, the internal wire bundle 44 and the protection tube sleeved on the wire bundle 44 can pass through the same chamber of the main body adjustable bending section 22 and penetrate out of the transition section 7, enter the handle assembly 6, and are connected with the external tail socket. The main body adjustable bending section 22 further has at least one cavity for the main body pulling wire 32 to pass through, and the distal end of the main body pulling wire 32 is fixed on the inner wall of the cavity, for example, the fixing of the main body pulling wire 32 on the inner wall of the main lumen tube 211 can be realized by a T-shaped plug 400. In other embodiments, other fixing means, such as welding, bolts, etc., may be used, and the present application is not limited thereto.

Further, in the catheter body section 1, all the wires can be gathered in one main sheath, and the main body wire 32, the branch wires 31 and the wire bundle 44 in the main sheath pass through the single lumen of the catheter body section 1 and enter the lumen of the handle assembly 6. The wires are connected to the tail wire socket 8 on the side wall of the handle assembly 6, and the branch pulling wires 31 are separated through different cavities in the handle and are respectively fixed on the corresponding branch bending control pieces 61.

To sum up, the utility model provides a medical catheter includes: the adjustable bending section is connected with the far end of the catheter main body section and comprises at least two branch adjustable bending sections, the number of the branch pulling lines is at least two, the near ends of the at least two branch pulling lines penetrate through the inner cavity of the catheter main body section, and the far ends of the at least two branch pulling lines are respectively fixed in the branch adjustable bending sections and used for changing the bending shape of the branch adjustable bending sections. The utility model provides a medical catheter, its distal end include two at least adjustable curved sections in branch, each the adjustable curved section in branch independently controls curved, all the cooperation is controlled curved between the adjustable curved section in branch, can realize that pipe distal end multidimension mark survey and multi-angle paste and lean on to it is more high-efficient to make the mark survey, and is more accurate, and application scope is wider. In addition, the medical catheter provided by the utility model, the branch bending control part is provided with different gears, so that the whole body formed by the branch bending adjustable sections is distributed in different circle diameters in a three-dimensional space, and the deformation structures are suitable for the mapping of patients and different structures under different conditions, thereby improving the operation efficiency; the branch independent bending control design and the pretreatment of the support elastic sheet in the branch adjustable bending section in a spiral angle form improve the in-place property and the attaching property of the far end of the catheter; the electrodes of the multiple branch adjustable bending sections at the far end of the catheter are matched with the sensors in a distributed mode, so that the visualization efficiency of the catheter is improved, and corresponding support is provided for functions required by testing equipment.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on the difference from the other embodiments, the same and similar parts between the embodiments may be referred to each other, and in addition, different parts between the embodiments may also be used in combination with each other, which is not limited by the present invention.

It should also be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, the foregoing description is not intended to limit the invention. To anyone skilled in the art, without departing from the scope of the present invention, the technical solution disclosed above can be used to make many possible variations and modifications to the technical solution of the present invention, or to modify equivalent embodiments with equivalent variations. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.

Claims

1. A medical catheter, comprising:

a catheter body section;

2. The medical catheter of claim 1, wherein the branch adjustable bending section comprises a lumen and a stent disposed within the lumen, the stent having a helical deflection, a proximal end of the stent being secured to a distal end of the catheter body section, and a distal end of the stent being connected to the branch pull wire.

3. The medical catheter of claim 2, wherein the helical state of the stent changes as the branch pull wire moves proximally from the distal end of the lumen, the loop diameter of the branch adjustable bend section gradually decreases and the axial height gradually decreases.

4. The medical catheter of claim 2, wherein said stent is a leaf spring and said branch pull wire is secured to the distal end of said lumen.

5. The medical catheter of claim 2, wherein the lumen has a helical deflection that matches the stent.

6. The medical catheter of claim 2, wherein said lumen is a single lumen tube having a symmetrical contoured hole structure for passage of said branch pull wires and wire bundles from either side of said stent.

7. The medical catheter of claim 2, wherein the parameters of the helical deflection include a helix angle, a helix diameter, and a helix length, the stent having a helix angle in a range of between 15 degrees and 45 degrees, a helix diameter in a range of between 5mm and 60mm, and a helix length in a range of between 20mm and 60 mm.

8. The medical catheter of claim 2, further comprising a stent base disposed at a proximal end of said branch adjustable bend segment, said stent proximal ends of all of said branch adjustable bend segments being secured to said stent base.

9. The medical catheter of claim 8, wherein said stents of all of said branch adjustable bend segments are uniformly arranged along the circumference of said stent base.

10. The medical catheter of claim 1, wherein the deflection angle and the deflection direction of each branch adjustable bending section are the same when the travel distance of each branch pull wire is the same.

11. The medical catheter of claim 1, wherein said branch adjustable bend segments are at least 3 in number, wherein said branch pull wires are the same in number as said branch adjustable bend segments, and wherein upon simultaneous proximal movement of all of said branch pull wires, at least 3 of said branch adjustable bend segments form an S-shape in pairs, such that a plurality of said branch adjustable bend segments together form a distal active surface.

12. The medical catheter of claim 11, wherein each of the branch adjustable bends has a plurality of ring electrodes arranged in series along an axial direction of the branch adjustable bend.

13. The medical catheter of claim 1, further comprising a handle assembly disposed at the proximal end of the catheter body segment, the handle assembly including at least two branch steering members coupled to the proximal end of each branch pull wire for controlling movement of each branch pull wire within the corresponding branch adjustable bend segment to change the bend profile of the corresponding branch adjustable bend segment; at least two sliding grooves are formed in the side wall of the handle assembly, and the branch bending control pieces are arranged in the at least two sliding grooves in a sliding mode in a one-to-one correspondence mode.

14. The medical catheter of claim 13, wherein the branch control curve member has different shift positions, and the branch control curve member changes the loop diameter of the corresponding branch adjustable curve section through adjustment of the shift positions.

15. The medical catheter of claim 1, wherein said adjustable bend section further comprises a main body adjustable bend section, said main body adjustable bend section being located between said catheter main body section and said branch adjustable bend section; and the number of the first and second groups,

16. The medical catheter of claim 15, wherein a threaded movable member is disposed within the handle assembly and is threadably engaged with the primary control curve, the proximal end of the main body pull wire is coupled to the movable member, and the primary control curve is rotatably disposed at the proximal end of the handle assembly.

17. The medical catheter of claim 1, wherein a distal end of each of said branch adjustable bend segments is further provided with a tip electrode, a plurality of ring electrodes, and a sensor closer to said tip electrode than to said ring electrodes.

18. The medical catheter of claim 17, wherein said branched adjustable bend section includes a lumen and a stent disposed within said lumen, said sensor is a magnetic positioning sensor, and said sensor is disposed against said tip electrode and said stent.