CN217119106U - Balloon catheter - Google Patents

Abstract

The utility model provides a balloon catheter, which comprises a catheter body, a balloon, a handle and a traction body; the balloon is arranged on the catheter body; the traction body is arranged in the catheter body, and the proximal end of the catheter body is connected with the handle; the handle comprises a control part which is connected with the traction body and can pull the traction body; the catheter body comprises a distal tube which is connected with a traction body and can be bent under the pulling of the traction body, and the proximal end of the distal tube is connected with the distal end of the balloon. Therefore, the balloon catheter has stronger crossing capability in a tortuous preset channel, thereby being capable of rapidly and accurately expanding pathological changes, simultaneously increasing the controllability of doctors and effectively reducing the operation time of the doctors.

Description

Balloon catheter

Technical Field

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

Background

Balloon dilatation catheters have become a common medical device for treating transurethroureteroscopy with holmium laser lithotripsy. In the ureteroscope process, a ureter is often narrow, so that the ureteroscope is difficult to insert. Ureteral stenosis is currently treated with ureteral balloon dilatation, but for patients with partial ureteral tortuosity, a conventional balloon is difficult or unable to pass through the ureter that is too tortuous.

In the existing balloon dilatation, a guide wire or a guide catheter is required to be placed at a lesion position of a ureter before dilatation, then the balloon catheter enters along a channel of the guide wire or the guide catheter and reaches the lesion position, and then the balloon catheter is used for dilatation of the lesion position. In the conventional guide wire guided balloon dilatation, the passability of a balloon completely depends on the passability of a guide wire, and for some channels with serious tortuosity, the guide wire cannot pass smoothly, so that a balloon catheter cannot pass, the lesion position cannot be expanded, and open surgery is needed. For the catheter-guided balloon dilatation, the configuration (shape) and size of the guide catheter are limited, so the catheter-guided balloon dilatation can only be used for dilating specific lesion positions and has great limitation; meanwhile, for an excessively tortuous channel, the guide catheter often cannot pass through smoothly, so that the balloon catheter cannot reach a lesion position, and the use is limited.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that exists among the prior art, the utility model aims to provide a sacculus pipe can possess stronger throughput in tortuous passageway to can be fast and accurate expansion pathological change, still can increase doctor's the nature controlled simultaneously, effectively reduce doctor's operation time.

In order to realize the aim, the utility model provides a balloon catheter, which comprises a catheter body, a balloon, a handle and a traction body; the balloon is arranged on the catheter body; the traction body is arranged in the catheter body, and the proximal end of the catheter body is connected with the handle; the handle comprises a control part which is connected with the traction body and can pull the traction body; the catheter body comprises a distal tube which is connected with the traction body and can be bent under the pulling of the traction body, and the proximal end of the distal tube is connected with the distal end of the balloon.

Optionally, the distal tube includes a catheter tip and a control elbow, and a proximal end of the catheter tip is connected to a distal end of the control elbow; the traction body penetrates through the control elbow pipe to be connected with the head end of the conduit.

Optionally, the catheter head end includes an outer tube and a connector, the connector is fixedly disposed inside the outer tube, the traction body is connected with the connector, and the hardness of the outer tube is less than that of the connector.

Optionally, the connector is provided with at least two mounting holes connected with the traction body, and the traction body can pull the corresponding one of the mounting holes to bend the catheter head end towards a predetermined direction.

Optionally, the number of the mounting holes is two, and the two mounting holes are symmetrically arranged along the axial direction of the connecting piece.

Optionally, the number of the traction bodies is one, the traction bodies penetrate through the control part and are fixedly connected with the control part, and two ends of each traction body are respectively connected with one corresponding mounting hole;

or the number of the traction bodies is two, and two ends of each traction body are respectively connected with the control part and one mounting hole.

Optionally, the axis of the connector coincides with the axis of the outer tube.

Optionally, the outer tube is made of a medical polymer material, and the connecting piece is made of a radiopaque metal material.

Optionally, the accuse return bend includes outer structure, middle level structure and the inlayer structure nested in proper order from outside to inside, the outer structure and the inlayer structure of accuse return bend are the polymer pipe, the middle level structure of accuse return bend is the metal pipe that can buckle, just be provided with in the inlayer structure of accuse return bend and supply the first cavity that the traction body wore to establish to and can be full or the pressure release the second cavity of sacculus.

Optionally, the middle layer structure of the elbow control pipe is a snake bone pipe.

Optionally, the catheter body further comprises a middle tube and a proximal tube; the distal tube, the middle tube and the proximal tube are sequentially connected from the distal end to the proximal end; the balloon is sleeved on the middle tube; the proximal end of the proximal tube is connected with the handle; the distal tube, the middle tube and the proximal tube are all provided with third chambers through which the traction body can pass; and the middle tube and the proximal tube are also provided with a fourth chamber which can be filled with or decompressed with the saccule.

Optionally, the control part includes a guide rail and a slider capable of moving along the guide rail, and the traction body is connected with the slider.

Optionally, the handle further comprises a winding portion capable of keeping the traction body straight.

The balloon catheter provided by the utility model can bend the far-end tube through the control part on the handle, so that the balloon catheter has better passing capability when passing through a tortuous predetermined channel such as a ureter and the like, and can rapidly and accurately expand a narrow area, thereby effectively improving the success rate of doctor operations; meanwhile, the balloon catheter is simple in structure and convenient to operate, has better controllability, and effectively reduces the operation time of doctors.

Drawings

Fig. 1 is a schematic structural view of a balloon catheter according to a preferred embodiment of the present invention;

fig. 2 is a schematic structural view of a catheter tip according to a preferred embodiment of the present invention;

fig. 3 is a schematic structural view of a connecting member according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of the middle layer structure of the elbow control pipe according to a preferred embodiment of the present invention;

FIG. 5 is a schematic view of the inner layer structure of the elbow control pipe according to a preferred embodiment of the present invention;

fig. 6 is a schematic structural view of a balloon according to a preferred embodiment of the present invention;

fig. 7 is a schematic structural view of a handle according to a preferred embodiment of the present invention;

fig. 8 is a schematic view of the balloon catheter according to a preferred embodiment of the present invention with the distal tube bent to the left;

fig. 9 is a schematic view showing the structure of the balloon catheter according to a preferred embodiment of the present invention in which the distal tube is bent toward the right side.

In the figure: a catheter body 1; a distal tube 11; a catheter tip 111; an outer tube 1111; a connecting piece 1112; a mounting hole 1113; a control bend tube 112; a middle layer structure 1121 of the bend control tube 112; the inner layer structure 1122 of the trap 112; a first chamber 1123; a second chamber 1124; an intermediate tube 12; a marker ring 121; filling the aperture 122; a proximal tube 13;

a balloon 2; a handle 3; a control unit (31); a guide rail 311; a slider 312; a winding part 32;

a traction body 4; a left traction body 41; right side tractor 42.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

The terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships of the illustrated figures, merely to facilitate description and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. As used in this specification, the term "distal" generally refers to the end distal to the operator, i.e., the end proximal to the distal tube in a balloon catheter; the term "proximal" as opposed to "distal" generally refers to the end near the operator, i.e., the end near the handle in a balloon catheter.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as either a fixed connection, a detachable connection, or an integral part; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or through an intermediary, may be internal to the two elements or may be in an interactive relationship with the two elements unless specifically limited 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.

The balloon catheter of one or more embodiments of the present application may be used for balloon dilatation in various parts of the human body. In the following description, the balloon catheter is described only by way of example of ureteral balloon dilatation, but it will be understood by those skilled in the art that the balloon catheter can also be used in other types of balloon dilatation, and therefore, the predetermined channel in the present application may be a ureter, or a complex, tortuous or multi-lumen site in other parts of the human body.

The present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. In the following embodiments, features of the embodiments can be supplemented with each other or combined with each other without conflict.

As shown in fig. 1-7, a preferred embodiment of the present invention provides a balloon catheter that can be used to dilate a ureter. The balloon catheter comprises a catheter body 1, a balloon 2, a handle 3 and a traction body 4, wherein the proximal end of the catheter body 1 is connected with the handle 3, and the traction body 4 is arranged in the catheter body 1; the handle 3 comprises a control part 31 which is connected with the traction body 4 and can pull the traction body 4, and the distal end of the catheter body 1 comprises a distal tube 11 which is connected with the traction body 4 and can be bent under the pulling of the traction body 4. In actual use, the control portion 31 is used to pull the traction body 4 to bend the distal tube 11. The balloon 2 is arranged on the catheter body 1, and the far end of the balloon 2 is connected with the near end of the far end tube 11.

In the prior art, when the guide catheter or the guide wire is used for driving the ureteral dilatation balloon catheter to move, the balloon catheter cannot easily pass through a tortuous ureter. When the balloon catheter provided by the application is used for ureteral balloon dilatation, the balloon catheter can control the distal tube 11 to bend through the control part 31 and the traction body 4 under the direct vision of a ureteroscope, so that the balloon catheter has better traversing capability, the balloon 2 can smoothly and efficiently reach a diseased part of the ureter under the drive of the distal tube 11, the diseased part is quickly and accurately dilated, and the success rate of a doctor operation is effectively improved; meanwhile, the balloon catheter is simple in structure and convenient to operate, has good controllability, and can effectively reduce the operation time of doctors.

The structure of the pulling body 4 is not limited in the present application, for example, the pulling body 4 includes, but is not limited to, a wire, a rope, a belt, etc. The application also does not limit the number of the traction bodies 4, and the number of the traction bodies 4 can be set according to actual needs, such as one or two or more.

The structure of the control unit 31 is not limited in the present application, and the control unit 31 may be any structure capable of pulling the traction body 4. For example, in one embodiment, the control unit 31 is configured as a slider, and the slider moves to move the traction body 4. As another example, in an embodiment, the control portion 31 may be configured as a driving motor, and the traction body 4 is driven by the driving motor to move. In other embodiments, the control portion 31 may be configured as a rotatable knob, and the rotation of the knob drives the traction body 4 to move. In another embodiment, the control unit 31 may also be a rack-and-pinion drive or a lead screw nut drive. Further, the movement of the control portion 31 may be controlled manually or electrically.

Referring to fig. 1 and 2, in a preferred embodiment, the distal tube 11 includes a catheter tip 111 and a control bend tube 112, the catheter tip 111 is the end of the balloon catheter that enters the ureter first, the proximal end of the catheter tip 111 is connected to the distal end of the control bend tube 112, and the traction body 4 passes through the control bend tube 112 and is connected to the catheter tip 111. Therefore, when the pulling body 4 pulls the catheter tip 11, the bending control tube 112 is driven to bend, as shown in fig. 8 and 9. With the arrangement, the controllable bending pipe 112 can be bent at a larger angle, and the bent controllable bending pipe 112 can better drive the balloon catheter to reach a tortuous ureter, so that the expansion of the balloon 2 at the ureter is completed. In this embodiment, the bend angle of the control bend tube 112 is preferably set to 0 ° to 180 ° to facilitate passage of the balloon catheter through most of the ureter. It will be appreciated that when the distal tube 11 is in the initial position (i.e., no bending occurs), the direction in which the proximal end of the balloon catheter points distally is defined as the initial direction, and the bending angle is the angle formed between the proximal direction of the catheter tip 111 and the initial direction.

With continued reference to fig. 1 and 2, in a preferred embodiment, the catheter tip 111 includes an outer tube 1111 and a coupling member 1112, the coupling member 1112 is fixedly disposed inside the outer tube 1111, and the traction body 4 is coupled to the coupling member 1112, and the outer tube 111 has a hardness less than the hardness of the coupling member 1112. The material hardness of the connecting piece 1112 is high, the connecting piece 1112 is not easy to break, the distal tube 11 is convenient to drive to bend under the pulling of the traction body 4, the material of the outer tube 1111 is relatively soft, the outer tube 1111 can wrap and fix the connecting piece 1112, on one hand, the connecting piece 1112 is protected, the connecting piece 1112 is prevented from moving or being dislocated, and on the other hand, the human tissue is protected, and the human tissue is prevented from being scratched by the catheter head end 111.

The fixing connection between the outer tube 1111 and the connection member 1112 is not limited in this application, for example, the two may be fixed by gluing, welding or mechanical connection.

The application does not limit the specific materials of the outer tube 1111 and the coupling 1112. Preferably, the outer tube 1111 is made of a medical polymer material, such as Pebax, TPU and/or silica gel, and the connecting member 1112 may be made of a metal material, preferably a metal elastic material, such as a stainless steel tube, a nitinol tube, or the like. It is further preferred that the material of attachment 1112 is a radiopaque metallic material to enable attachment 1112 to be visualized under X-ray, such as platinum iridium, platinum gold, and the like, with no limitation on the specific type of radiopaque material. Visualization of the coupling 1112 facilitates the physician in determining the location of the catheter tip 111 and thus the bending status of the distal tube 11. Further, in order to allow the outer tube 1111 to pass through the ureter easily without causing damage to the ureter, the outer tube 1111 is preferably configured to have a smooth outer surface and a conical structure.

Preferably, at least two mounting holes 1113 connected to the pulling body 4 are formed in the connecting element 1112, and the pulling body 4 corresponding to any one of the mounting holes 1112 can be pulled so as to bend the catheter head end 111 in a predetermined direction, so that the distal tube 11 can be bent in at least two directions, and when the bending requirements in different directions are met, the balloon catheter needs to be rotated to adjust the bending direction of the distal tube 11 to match with ureters with different circuitries. It should be understood that the "predetermined direction" herein generally refers to the axial direction where the traction body 4 is connected with the corresponding mounting hole 1113.

In some embodiments, the number of the mounting holes 1113 is two, and the two mounting holes 1113 are symmetrically arranged along the axial direction of the coupling element 1112, and then the pulling bodies 4 corresponding to the two mounting holes 1113 can be pulled respectively to bend the catheter tip 111 in opposite directions, i.e. the catheter tip 111 can be bent in two directions, for example, left and right directions, so as to better adapt to ureters of various shapes. It should be understood that both the left and right sides herein refer to the direction of bending of the distal tube 11 as viewed from the proximal end of the balloon catheter in the distal direction.

In another embodiment, the number of the mounting holes 1113 may also be set to three, four, five, or more, thereby achieving bending of the catheter tip 111 in more directions.

Referring to fig. 1 to 3, in the present embodiment, the coupling 1112 is configured as a sleeve structure and penetrates in a radial direction to form two mounting holes 1113, the outer tube 1111 is provided with an inner hole, and the outer diameter of the coupling 1112 is matched with the inner diameter of the inner hole of the outer tube 1111 to achieve bidirectional bending of the distal tube 11.

Generally speaking, the number of the tractors 4 is the same as the number of directions in which the distal tube 11 can be bent, one tractor 4 can bend the distal tube 11 to one side, and two tractors 4 can be provided to bend the distal tube 11 in both directions; four pull bodies 4 may also be provided to impart upward, downward, left, and right bending capabilities to the distal tube 11.

Referring to fig. 1 and 7, in the present embodiment, the number of the traction body 4 is one, the traction body 4 passes through the control part 31 and is fixedly connected to the control part 31, and both ends of the traction body 4 are respectively connected to a corresponding one of the mounting holes 1113. Specifically, one end of the pulling body 4 is fixedly connected to one of the mounting holes 1113, the other end passes through the control portion 31 and is fixedly connected to the other mounting hole 1113, and the pulling body 4 is fixedly connected to the control portion 31 at a position where the pulling body 4 contacts the control portion 31 when the distal tube 11 is in the initial position (i.e., no bending occurs). So set up, only need a traction body 4 can realize controlling in two opposite directions bending in the sacculus pipe, it is effectual to control bending. The specific bending control process is described in detail below.

Referring to fig. 7, in the present embodiment, the number of the pulling body 4 is one, and the pulling body includes a left pulling body 41 and a right pulling body 42 integrally connected, distal ends of the left and right pulling bodies are respectively connected to the mounting holes 1113 at two radial sides of the coupling 1112, and proximal ends of the left and right pulling bodies are both fixedly connected to the control portion 31 (specifically, the pulling body 4 and the control portion 31 are fixedly connected at a position where the pulling body 4 contacts the control portion 31 when the distal tube 11 is at an initial position (i.e., no bending occurs), and the position where the pulling body 4 contacts the control portion 31 when the distal tube 11 is at the initial position (i.e., no bending occurs) is used to divide the left pulling body 41 and the right pulling body 42).

Of course, in other embodiments, the number of the pulling bodies 4 may also be two, the two ends of each pulling body 4 are respectively connected to the control part 31 and one mounting hole 1113, and the number of the mounting holes 1113 is the same as the number of the pulling bodies 4 and corresponds to one. At this time, the control unit 31 can adjust the bending angle and the bending direction of the distal end tube 11 by stretching any one of the pulling bodies 4 to bend the distal end tube 11.

The present application is not limited to the configuration of connector 1112 and the attachment location of connector 1112 to outer tube 1111, and connector 1112 need only be configured and positioned to allow distal tube 11 to flex.

Preferably, the axis of the coupling element 1112 is coincident with the axis of the outer tube 1111, such that the distal tube 11 can be bent symmetrically in opposite directions (e.g., left and right), i.e., such that the distal tube 11 can have the same maximum bending angle in opposite directions and the balloon catheter can have the same traversing capability in opposite directions. As shown in fig. 8 and 9, the balloon catheter of the present embodiment can be bent by 0 ° to 180 ° on both left and right sides, respectively, so as to achieve the purpose of symmetrical bending.

Further, referring to fig. 4 and 5, the bend control tube 112 preferably includes an outer layer structure (not shown), a middle layer structure 1121 and an inner layer structure 1122 which are nested from outside to inside, and the outer layer structure, the middle layer structure 1121 and the inner layer structure 1122 of the bend control tube 112 are all configured as bendable tubes. The outer layer structure and the inner layer structure 1122 of the bend control pipe are both polymer pipes, and the middle layer structure 1121 of the bend control pipe 112 is a bendable metal pipe. The specific materials of the outer layer structure, the middle layer structure 1121, and the inner layer structure 1122 of the bend control pipe 112 are not limited in this application. For example, the outer layer structure of the elbow control pipe 112 may be one or a combination of Pebax, PTFE, TPU and silica gel materials; the middle layer structure 1121 of the controlled bending tube 112 may be a metal material, such as a stainless steel tube, a nitinol tube, etc.; the inner layer 1122 of the elbow control pipe 112 may be made of a flexible polymer material, such as nylon, TPU, etc.

Referring to fig. 5 to 7, the inner layer 1122 of the bending control tube 112 is a triple lumen tube, which includes a first lumen 1123 for the traction body 4 to pass through, and a second lumen 1124 for filling or decompressing the balloon. The first and second chambers 1123, 1124 are each axially through-holes.

Referring to fig. 1 and 4, in order to facilitate the bending of the elbow control tube 112, the middle layer structure 1121 of the elbow control tube 112 is preferably configured as a "snake bone tube", which can be bent in opposite directions, and has a good bending effect. So configured, the middle layer structure 1121 of the control elbow 112 can be bent only in two opposite directions, but not in other directions, and is easier to control, so that the bending direction of the distal tube 11 can be defined, and the ureter is prevented from being damaged.

In a preferred embodiment, the outer tube 1111 and the control bend tube 112 are each coated on their outer surfaces with a hydrophilic coating, including but not limited to polyvinylpyrrolidone. In the present embodiment, referring to fig. 1, since the balloon catheter is usually used with a ureteroscope, the length L1 of the distal tube 11 is preferably set to 30-40 mm, so that the position of the balloon 2 can be clearly observed by using the ureteroscope, so as to facilitate the operator to observe the progress of the operation.

Referring to fig. 1 and 6, in this embodiment, the catheter body 1 further includes a middle tube 12 and a proximal tube 13, the distal tube 11, the middle tube 12 and the proximal tube 13 are sequentially connected from the distal end to the proximal end, the balloon 2 is sleeved on the middle tube 12, the proximal end of the proximal tube 13 is connected to the handle 3, the distal tube 11, the middle tube 12 and the proximal tube 13 are respectively provided with a third chamber (not shown) through which the traction body 4 can be inserted, and the middle tube 12 and the proximal tube 13 are further provided with a fourth chamber (not shown) through which the balloon 2 can be inflated or deflated. The intermediate tube 12 is preferably identical to the inner structure 1122 of the control bend tube 112 to facilitate communication between the intermediate tube 12 and the distal tube 11.

The middle tube 12 is further provided with at least two marker rings 121 and at least one filling hole 122, and the at least two marker rings 121 are respectively arranged at a position close to the proximal end and a position close to the distal end of the balloon 2. The marker rings 121 can be visualized under X-rays to mark the position of the balloon 2 and the length of the working segment (i.e. the distance between at least two marker rings 121) after the balloon catheter has entered the body, so that the position of the balloon 2 in the ureter and the degree of expansion of the ureter can be determined. The filling hole 122 is a through hole that penetrates in the radial direction of the intermediate tube 12 and is used for filling or relieving the balloon 2. Preferably, the filling hole 122 may be configured as an oblong hole (see fig. 6), so as to enlarge the area of the filling hole 122, and enable the filling and pressure relief process of the balloon 2 to be performed efficiently.

Optionally, the outer surface of the balloon 2 is coated with a drug coating, and the type of the drug coating on the outer surface of the balloon 2 is not limited, such as but not limited to at least one of paclitaxel compound, sirolimus compound, and rapamycin compound.

In one embodiment, the proximal tube 13 also includes an outer layer structure, a middle layer structure, and an inner layer structure nested from the outside to the inside, and the inner layer structure of the proximal tube 13 is preferably the same as the inner layer structure 1122 of the control bend tube 112. The middle layer structure of the proximal tube 13 is preferably provided as a woven mesh tube, which provides the proximal tube 13 with high strength to provide support for the distal tube 11 and balloon 2 and to correct a curved ureter. It should be understood that the present application does not limit the materials of the outer layer structure, the middle layer structure and the inner layer structure of the proximal tube 13, wherein the material of the outer layer structure of the proximal tube 13 is one or a combination of TPU and PTFE, the middle layer structure of the proximal tube 13 is a high-strength metal tube, such as a stainless steel or nitinol tube, and the inner layer structure of the proximal tube 13 is a polymer material tube, such as a nylon tri-lumen tube.

In another embodiment, the proximal tube 13 may be a single layer of relatively strong tubing, the single layer being the same as the inner layer 1122 of the trap 112, and optionally, the single layer may be a triple lumen tubing (e.g., triple lumen nylon tubing).

Referring to fig. 7, in one embodiment, the control unit 31 includes a guide rail 311 and a slider 312 movable along the guide rail 311, and the traction body 4 is coupled to the slider 312. In one embodiment, the number of the pulling bodies 4 is one, the pulling bodies 4 pass through the sliding block 312 and are fixedly connected with the sliding block 312 (the connection point is the position where the pulling bodies 4 contact the sliding block 312 when the distal tube 11 is in the initial position (i.e. bending does not occur)), and two ends of one pulling body 4 are respectively connected with two mounting holes 1113 on the connecting element 1112, so that the sliding block 312 can pull the pulling body on one side while sliding, and release the pulling body on the other side to bend the distal tube 11. Specifically, the traction body 4 is divided into a left traction body 41 and a right traction body 42 after being fixedly connected with the sliding block 312; when the slider 312 slides on the guide rail 311, the left pulling body 41 or the right pulling body 42 is pulled, and the left pulling body 41 or the right pulling body 42 can drive the distal tube 11 to bend towards the left or the right. In more detail, the path formed by the traction body 4 in the balloon catheter is specifically: one end of the traction body 4 is fixed at a mounting hole 1113, and passes through the control bending tube 112, the middle tube 12 and the near end tube 13 in the balloon catheter in sequence, then passes through the sliding block 312 and is fixedly connected with the sliding block 312, and then passes through the near end tube 13, the middle tube 12 and the control bending tube 112 in sequence and is fixedly connected with another mounting hole 1113, so as to form a left traction body 41 and a right traction body 42 in the balloon catheter.

With continued reference to fig. 7, the handle 3 preferably further includes a coil 32 capable of providing tension to the traction body 4, the coil 32 being capable of maintaining the traction body 4 straight. In this embodiment, the number of the winding portions 32 is two, and the two winding portions 32 are separated by a certain distance, when the traction body 4 is connected to the slider 312, the left traction body 41 and the right traction body 42 can be respectively attached to the outer sides of the two winding portions 32, so that the left traction body 41 and the right traction body 42 can always keep a straight state, the traction body 4 is prevented from being accumulated in the balloon catheter, and the distal tube 11 can be rapidly bent when the slider 312 slides, thereby improving the sensitivity of the balloon catheter. It should be understood that "outside of the winding portions 32" refers to a side of one winding portion 32 facing away from the other winding portion 32. The configuration of the winding portion 32 is not limited in the present application, and the winding portion 32 may be provided as a protrusion or a pulley, and preferably may be provided as a pulley, to facilitate the sliding of the traction body 4 and reduce the wear of the traction body 4.

In one non-limiting embodiment, referring to fig. 7-9 in combination with fig. 1 and 2, the bending process of the balloon catheter in the ureter is as follows:

when the balloon catheter needs to be bent towards the left side, referring to fig. 8, the slider 312 on the handle 3 can be slid towards the distal end (i.e. the slider 312 is slid towards the first direction L on the handle 3), at this time, the slider 312 can stretch the left traction body 41 in the sliding process and release the right traction body 42, the connecting element 1112 moves towards the left side after being stretched by the left traction body 41 and drives the distal tube 11 to be bent towards the left side, at this time, the distal tube 11 can form a certain angle with the balloon 2 and the proximal tube 13 and can drive the balloon 2 to be bent towards the left side, and then the balloon 2 can pass through the tortuosity in the ureter to reach a lesion site;

when the balloon catheter needs to be bent towards the right side, referring to fig. 9, the slider 312 on the handle 3 can be slid towards the proximal end (i.e. the slider 312 is slid towards the second direction R on the handle 3), at this time, the slider 312 can stretch the right traction body 42 during the sliding process and release the left traction body 41, the connecting element 1112 moves towards the right side after being stretched by the right traction body 42 and drives the distal tube 11 to be bent towards the right side, at this time, the distal tube 11 can also form a certain angle with the balloon 2 and the proximal tube 13 and can drive the balloon 2 to be bent towards the right side, and further pass through the tortuosity in the ureter to reach the lesion site.

To sum up, the balloon catheter provided by the utility model can bend the distal tube 11 through the control part 31 on the handle 3, so that the balloon catheter has better passing ability when passing through the tortuous ureter, can rapidly and accurately expand a narrow area, and effectively improves the success rate of the doctor operation; meanwhile, the balloon catheter is simple in structure and convenient to operate, and has good controllability, so that the operation time of a doctor is effectively reduced.

The above description is only for the preferred embodiment of the present invention, and not for any limitation of the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure all belong to the protection scope of the present invention.

Claims (13)

1. A balloon catheter is characterized by comprising a catheter body, a balloon, a handle and a traction body; the balloon is arranged on the catheter body; the traction body is arranged in the catheter body; the proximal end of the catheter body is connected with the handle; the handle comprises a control part which is connected with the traction body and can pull the traction body; the catheter body comprises a distal tube which is connected with the traction body and can be bent under the pulling of the traction body, and the proximal end of the distal tube is connected with the distal end of the balloon.

2. The balloon catheter of claim 1, wherein the distal tube comprises a catheter tip and a control bend, the proximal end of the catheter tip being connected to the distal end of the control bend; the traction body penetrates through the control elbow pipe to be connected with the head end of the conduit.

3. The balloon catheter of claim 2, wherein the catheter tip comprises an outer tube and a connector, the connector is fixedly disposed inside the outer tube, the pull body is connected to the connector, and the outer tube has a hardness less than a hardness of the connector.

4. The balloon catheter according to claim 3, wherein the connector is provided with at least two mounting holes connected to the traction body, and the traction body corresponding to any one of the mounting holes can be pulled to bend the catheter tip in a predetermined direction.

5. The balloon catheter according to claim 4, wherein the number of the mounting holes is two, and the two mounting holes are symmetrically arranged in the axial direction of the connector.

6. The balloon catheter of claim 5, wherein the number of the traction body is one, the traction body passes through the control part and is fixedly connected with the control part, and two ends of the traction body are respectively connected with one corresponding mounting hole;

or the number of the traction bodies is two, and two ends of each traction body are respectively connected with the control part and one mounting hole.

7. A balloon catheter according to claim 3, wherein the axis of the connector coincides with the axis of the outer tube.

8. The balloon catheter of claim 3, wherein the outer tube is made of a medical polymer material and the connector is made of a radiopaque metal material.

9. The balloon catheter according to claim 2, wherein the controlled bending pipe comprises an outer layer structure, a middle layer structure and an inner layer structure which are nested in sequence from outside to inside, the outer layer structure and the inner layer structure of the controlled bending pipe are both polymer pipes, the middle layer structure of the controlled bending pipe is a bendable metal pipe, and a first cavity for the traction body to penetrate through and a second cavity for filling or relieving the balloon are arranged in the inner layer structure of the controlled bending pipe.

10. The balloon catheter of claim 9, wherein the mid-layer structure of the steering tube is a snake bone tube.

11. The balloon catheter of claim 1, wherein the catheter body further comprises a middle tube and a proximal tube; the distal tube, the middle tube and the proximal tube are sequentially connected from the distal end to the proximal end; the balloon is sleeved on the middle tube; the proximal end of the proximal tube is connected with the handle; the distal tube, the middle tube and the proximal tube are all provided with third chambers through which the traction body can pass; and the middle tube and the proximal tube are also provided with a fourth chamber which can be filled with or decompressed with the saccule.

12. The balloon catheter according to claim 1, wherein the control portion includes a guide rail and a slider movable along the guide rail, the traction body being coupled to the slider.

13. The balloon catheter of claim 1, wherein the handle further comprises a coil capable of maintaining the pull body taut.

Images