CN109381779B - balloon catheter - Google Patents

Abstract

The invention discloses a balloon catheter, which comprises a pushing catheter and at least two expandable balloons positioned at the distal end of the pushing catheter. The pushing catheter comprises a catheter main body and a branch pipe body arranged at the far end of the catheter main body. The branch pipe body at least comprises a first branch and a second branch which extend towards different directions respectively. The balloon catheter of the invention can expand stenotic lesions of bifurcated vessels at one time, reduce the number of cannulation, enable full expansion, avoid vessel tearing, save operation time and reduce operation cost and complexity.

Description

balloon catheter

Technical field

The invention belongs to the technical field of medical devices and relates to a balloon catheter.

Background technique

The balloon catheter is a tool used for endovascular angioplasty and has been widely used in clinical medicine for percutaneous transluminal angioplasty and percutaneous transluminal coronary angioplasty. The existing balloon catheter structure is usually a single balloon catheter with an expandable balloon disposed at the distal end of the catheter. When using this single balloon catheter to treat bifurcation vascular lesions, there are two commonly used treatment methods:

One way is to first use a single balloon catheter to dilate the front part of the bifurcation and the back part of the bifurcation, and then use a single balloon catheter to dilate the branch vessels. This treatment method has the following disadvantages: incomplete dilation in the middle of the bifurcation; excessive tearing of blood vessels due to multiple dilations; higher cost of using multiple balloon catheters; increased pain for patients due to multiple intubations; repeated intubation and dilation, The surgery is complex, takes a long time, and the doctor's work intensity is high.

Another way is to use a single balloon catheter to dilate the front, middle and back of the bifurcation simultaneously, and then use a separate balloon to dilate the branches. This treatment method has the following disadvantages: serious blood vessel tearing in the posterior bifurcation segment can easily lead to vascular dissection, which requires other means of repair (such as stent implantation); at the same time, it can easily cause excessive tearing of blood vessels and can easily lead to hyperplasia. Formation of secondary stenosis.

Contents of the invention

The technical problem to be solved by the present invention is to provide a distal bifurcated balloon catheter that can dilate the stenotic lesion of the bifurcated blood vessel at one time, so as to fully expand the middle part of the bifurcated blood vessel, and at the same time, to solve the defects of the existing technology. Reduce the number of intubations, avoid blood vessel tears, save surgical time, and reduce surgical complexity and cost.

The technical solutions adopted by the present invention to solve the technical problems are:

A balloon catheter includes a push catheter and at least two expandable balloons located at the distal end of the push catheter. The push catheter includes a catheter main body and a branch tube body located at the distal end of the catheter main body. The branch tube body at least includes a first branch and a second branch extending in different directions. The range of the angle between the axial direction of the first branch and the axial direction of the second branch is (0°, 180°]. The expandable balloon includes at least one distal end of the first branch. A first balloon and at least one second balloon disposed at the distal end of the second branch. The proximal diameter of the working section of at least one of the first balloon and the second balloon is smaller than diameter of the remainder of the working segment of the balloon.

In the balloon catheter, preferably, the diameter of the portion of the first balloon near the proximal end or/and the portion of the second balloon near the proximal end gradually decreases from the distal end to the proximal end.

In the balloon catheter, it is preferred that the catheter body is a multi-lumen tube. The multi-lumen tube is provided with a first guide wire cavity, a second guide wire cavity, a first filling cavity and a second filling cavity that are not connected with each other in the axial direction. The first guidewire lumen axially penetrates from the proximal end of the catheter body to the distal end of the first branch. The second guidewire lumen axially extends from the proximal end of the catheter body to the distal end of the second branch. The distal end of the first filling cavity is connected with the inner cavity of the first balloon. The distal end of the second filling cavity is connected with the inner cavity of the second balloon.

In the balloon catheter, preferably, the balloon catheter further includes a handle provided at the proximal end of the catheter body. The handle is provided with a first guide wire port, a second guide wire port, a first filling port and a second filling port. The first guidewire port is connected to the proximal end of the first guidewire lumen. The second guidewire port is connected to the proximal end of the second guidewire lumen. The first filling port communicates with the proximal end of the first filling chamber. The second filling port communicates with the proximal end of the second filling chamber.

In the balloon catheter, preferably, the catheter body includes a first tube body and a second tube body. The distal end of the first tube body is connected to the proximal end of the first branch. The distal end of the second tube body is connected to the proximal end of the second branch.

In the balloon catheter, it is preferable that the first tube body and the second tube body move relative to each other only in the axial direction, and the first branch and the second branch move simultaneously in the axial direction and the radial direction. to relative motion.

In the balloon catheter, preferably, the second tube body is movably inserted into the first tube body, and a side wall of the first tube body near the distal end is provided with a through hole. The distal end of the second tube body passes through the through hole and is connected to the proximal end of the second branch.

In the balloon catheter, it is preferable that the first tube body and the second tube body are arranged in parallel, and the first tube body and the second tube body are jointly inserted into the hollow hoop member.

In the described balloon catheter, preferably the balloon catheter further includes a first catheter seat located at the proximal end of the first tube body and a second catheter seat located at the proximal end of the second tube body, and the second catheter seat is opposite to the first catheter seat. The first catheter adapter moves axially.

In the balloon catheter, preferably, a first guide wire cavity and a first filling cavity are provided in the first tube body. The second tube body is provided with a penetrating second guidewire cavity and a second filling cavity. The proximal end of the first catheter adapter is provided with a third guide wire port and a third filling port. The proximal end of the second catheter adapter is provided with a fourth guidewire port and a fourth filling port. The third guidewire port is connected to the proximal end of the first guidewire lumen. The fourth guidewire port is connected to the proximal end of the second guidewire lumen. The third filling port is connected to the proximal end of the first filling chamber. The fourth filling port is connected to the proximal end of the second filling chamber.

By arranging a branch tube body at the distal end of the catheter body, and arranging at least one expandable balloon respectively on the branch tube body, the present invention has at least the following beneficial effects compared with the prior art:

In the balloon catheter of the present invention, the distal branch tube body can enter multiple branches of the bifurcated blood vessel at the same time, and can expand the stenotic lesion of the bifurcated blood vessel at one time, avoiding the problems of blood vessel tearing and incomplete expansion of the middle part of the bifurcated blood vessel. At the same time, it can save operation time, reduce the complexity of the operation, and avoid the pain caused by the patient being intubated multiple times.

Description of drawings

Figure 1 is a schematic structural diagram of a balloon catheter in Embodiment 1. The balloon catheter includes a push catheter and two expandable balloons located at the distal end of the push catheter. The push catheter includes a catheter body and a branch tube body located at the distal end of the catheter body;

Figure 2 is a cross-sectional view of the distal end of the catheter main body, the branch tube body and two expandable balloons in Figure 1;

Figures 3 to 5 are schematic diagrams of three embodiments of the expandable balloon in Figure 2;

6 to 10 are structural schematic diagrams of different embodiments of the catheter body in the balloon catheter of Embodiment 2;

Figure 11 is a schematic structural diagram of a balloon catheter in Embodiment 3. The balloon catheter includes a push catheter and two expandable balloons located at the distal end of the push catheter. The push catheter includes a catheter body and a branch tube body located at the distal end of the catheter body;

Figure 12 is a cross-sectional view of the distal end of the catheter main body, the branch tube body and two expandable balloons in Figure 11;

FIG. 13 is a cross-sectional view of another embodiment of the catheter body of FIG. 11 .

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

First of all, it needs to be explained that in the field of interventional medicine, the end close to the operator is usually called the proximal end, and the end far away from the operator is called the distal end.

Embodiment 1

Referring to Figure 1, a balloon catheter provided in Embodiment 1 of the present invention includes a push catheter and at least two expandable balloons located at the distal end of the push catheter.

The push catheter includes a catheter main body 100 and a branch tube body 200 located at the distal end of the catheter main body 100 . The branch tube body 200 includes at least two branches. Specifically, in this embodiment, the branch tube body 200 has a Y-shaped structure and has a first branch 210 and a second branch 220 respectively extending in different directions. The expandable balloon includes at least one first balloon 300 disposed at the distal end of the first branch 210 and at least one second balloon 400 disposed at the distal end of the second branch 220 . Specifically, in this embodiment, a first balloon 300 is provided at the distal end of the first branch 210 , and a second balloon 400 is provided at the distal end of the second branch 220 . Therefore, the first balloon 300 and the second balloon 400 are respectively pushed into the two branch blood vessels of the bifurcated blood vessel through the branch tube body 200, so that the front, middle and rear parts of the bifurcated blood vessel can be simultaneously expanded. It can be understood that in other embodiments, the number of the first balloons 300 and the second balloons 400 may be multiple, and the multiple first balloons 300 may be spaced apart by a certain axial distance or have no space between them. The plurality of second balloons 400 are connected in sequence with a certain axial distance between them or without any interval between them. Thus, simultaneous dilation of multiple stenotic lesions for each branch vessel can be achieved. For each first balloon 300 and second balloon 400, a corresponding filling cavity must be provided in the catheter body 100 for inflating the balloon.

There is an included angle α between the axial direction of the first branch 210 and the axial direction of the second branch 220 . The range of α is (0°, 180°], that is, 0°<α≤180°. Since the angle between the two branch vessels of the bifurcated blood vessel is generally less than or equal to 180°, α within this range is beneficial to The first branch 210 and the second branch 220 respectively deliver the first balloon 300 and the second balloon 400 into the two branch blood vessels of the bifurcated blood vessel. It can be understood that depending on the anatomical structure of the lesion that needs to be expanded, The branch tube body 200 can also have more than two branches, as long as an expandable balloon is provided on each branch.

Please also refer to FIG. 2 . The proximal diameter of the working section of the second balloon 400 is smaller than the diameter of the remaining part of the working section of the second balloon 400 . The working section of the expandable balloon refers to the part that is roughly cylindrical after the expandable balloon is filled and expanded, and can fit with the inner wall of the blood vessel to expand the blood vessel. The reason for this arrangement is that when the branch tube body 200 pushes the first balloon 300 and the second balloon 400 into the two branch blood vessels of the bifurcated blood vessel at the same time, the working sections of the first balloon 300 and the second balloon 400 The proximal end is also located at the bifurcation position of the bifurcated blood vessel, and the diameter of the blood vessel at the bifurcation position must be smaller than the sum of the diameters of the two branch blood vessels. Therefore, in order to avoid the proximal end of the working section of the first balloon 300 at the bifurcation position and the proximal end of the working section of the second balloon 400 being inflated at the same time, resulting in blood vessel tearing at the bifurcation position, the proximal end of the working section of the first balloon 300 is The sum of the diameter of the end and the diameter of the proximal end of the working section of the second balloon 400 needs to be smaller than the sum of the diameters of the remaining parts of the working section of the first balloon 300 and the second balloon 400. At the same time, for an expandable balloon, the effective length of the balloon, that is, the length of the working section, refers to the fact that the balloon assumes a roughly cylindrical shape after being inflated, fits the blood vessel wall, and supports and expands the blood vessel during the operation. The length, and therefore the length of the working section, determines the expansion performance of the balloon. The proximal diameter of the working section of the second balloon 400 in this embodiment is smaller than the remaining diameter of the working section of the balloon. Compared with an ordinary tapered balloon, the second balloon 400 still has a longer effective length. , so after filling, it has a higher ability to expand the blood vessel walls of branch vessels. In addition to the above embodiments, the diameter of the proximal end of the working section of the first balloon 300 may be smaller than the diameter of the remaining part of the working section of the first balloon 300 . Or the proximal diameters of the working sections of the first balloon 300 and the second balloon 400 are respectively smaller than the remaining diameters of the working sections of the two balloons.

The diameter of the portion of the first balloon 300 near the proximal end or/and the portion of the second balloon 400 near the proximal end gradually decreases from the distal end to the proximal end. Therefore, when the first balloon 300 and the second balloon 400 are inflated at the same time, the blood vessel tearing at the bifurcation position can be further prevented. The specific structures of the first balloon 300 and the second balloon 400 are as follows:

Referring to FIG. 3 , specifically, the first balloon 300 is fixed at the distal end of the first branch 120 . The fixing method is welding, bonding and other common technical means in this field, which will not be described in detail here. The first balloon 300 is composed of a proximal end part, a distal end part and a working section between the two. The proximal end and the distal end of the first balloon 300 are both generally tapered structures 310, and the middle working section 320 is a cylindrical structure with a diameter ranging from 2 to 15 mm. The length of the first balloon 300 ranges from 30 to 320 mm. The effective length of the first balloon 300, that is, the length of the working section 320, ranges from 20 to 300 mm. The surface of the first balloon 300 may be coated with at least one drug coating 330. The drug coating 330 may cover all or part of the surface of the first balloon 300 . In this embodiment, the drug coating 330 is mainly provided on the outer surface of the working section. The drug coating 330 may contain active drugs that inhibit smooth muscle cell proliferation, such as paclitaxel, rapamycin, etc. The diameter and effective length of the first balloon 300 can be selected according to the diameter of the blood vessel. The application of the drug coating 330 is an existing technology and will not be described again here. The working section 320 of the first balloon 300 is set to be roughly cylindrical, which ensures that the filled first balloon 300 has good wall adhesion and can adhere to the inner wall of the blood vessel for a certain length to ensure that the drug is effectively transferred to the inner wall of the blood vessel. .

The second balloon 400 is welded and fixed at the distal end of the second branch 220 . The diameter of the portion of the second balloon 400 near the proximal end gradually decreases from the distal end to the proximal end. There are various implementations of this gradually decreasing structure. For example, the rest of the second balloon 400 except for the distal end is generally tapered, and the diameter of the tapered shape gradually decreases from the distal end to the proximal end (as shown in the figure). shown in 3). Alternatively, the proximal end 403 and the distal end 401 of the second balloon 400 are generally tapered in opposite directions, and the middle portion 402 is cylindrical, with a smooth transition between the cylindrical shape and the tapered shape (as shown in FIG. 4 ). Alternatively, the proximal end 403 and the distal end 401 of the second balloon 400 are generally tapered in opposite directions, and the middle part 402 is cylindrical, and the diameters of the cylindrical and conical shapes are different to form a stepped structure (as shown in Figure 5 ). The tapered structure of the proximal portion 403 of the second balloon 400 is generally a long tapered shape with small changes in taper, so as to form a tapered shape with a longer length and small diameter changes, and the diameter of this part of the taper is smaller than that of the cylindrical shape. Portions are much smaller. The tapered and long tapered structure can increase the distance between the first balloon 300 and the second balloon 400 to avoid excessive vascular expansion, blood vessel tearing, or dissection caused by excessive adhesion or too small a distance between the two after inflation. problem, and at the same time increase the effective length of the balloon after inflation (i.e., the length of the working section).

As shown in FIG. 4 , the surface of the second balloon 400 is coated with at least one layer of drug coating 330 . The drug coating 330 is provided on the outer surface of the cylindrical portion of the second balloon 400 . In other embodiments, the drug coating 330 may not be provided on the surface of the second balloon 400 .

The sizes of the first balloon 300 and the second balloon 400 are determined according to the diameter of the blood vessel to be dilated, and are not specifically limited. The diameter of the first balloon 300 may be slightly larger than the diameter of the second balloon 400, or the diameter of the first balloon 300 may be the same as the diameter of the second balloon 400.

Please refer to Figure 1 again. The corresponding first branches 210 and second branches 220 within the effective length range of the first balloon 300 and the second balloon 400 are respectively provided with a developing positioning device 13 and a developing positioning device for balloon positioning. twenty three. The effective length range refers to the length range of the working section of the first balloon 300 or the second balloon 400 . The developing positioning device 13 and the developing positioning device 23 can be rings, strips, sheets, etc. made of X-ray developing materials, and their positions can be displayed under instrument detection to indicate the position of the balloon. The number of developing positioning devices 13 and 23 on each branch may be one or more. The connection method between the developing positioning device 13 and the developing positioning device 23 and each branch can be welding, bonding, hot pressing, riveting and other common technical means in the field, which will not be described again here.

Please also refer to Figure 2. The catheter body 100 is a multi-lumen tube. A branch tube body 200 is provided at the distal end of the catheter body 100 . The catheter main body 100 and the branch tube bodies 200 may be integrally formed; the catheter main body 100 and the branch tube bodies 200 may also be of separate structures, that is, the catheter main body 100 and the branch tube bodies 200 are formed separately and then assembled and fixed together. The assembly and fixation method may be any common technical means in the art such as bonding, welding, hot melting, threaded connection or interference fit, which will not be described again here.

The multi-lumen tube is provided with a first guide wire cavity 130, a second guide wire cavity 230, a first filling cavity 140 and a second filling cavity 240 that are not connected with each other along the axial direction. The first guidewire lumen 130 axially extends from the proximal end of the catheter body 100 to the distal end of the first branch 210 . The second guidewire lumen 230 axially extends from the proximal end of the catheter body 100 to the distal end of the second branch 220 . The distal end of the first filling cavity 130 is connected with the inner cavity of the first balloon 300 . The distal end of the second filling cavity 230 is connected with the inner cavity of the second balloon 400 .

The cross-sectional shape of the multi-lumen tube is not limited, as long as the four functional cavities are separated from each other. The first guidewire lumen 130 and the second guidewire lumen 230 are both used to accommodate and pass the guidewire. Therefore, the first guidewire lumen 130 and the second guidewire lumen 230 need to be in the form of a lumen with a smooth cavity and a shape that facilitates guidewire movement. For example, please refer to FIG. 6 . The cross-sections of the first guidewire lumen 130 and the second guidewire lumen 230 are usually circular or elliptical. The cross-sectional shapes of the first filling cavity 140 and the second filling cavity 240 are not limited and can be any shape, such as a circle (as shown in FIG. 6 ) or a crescent shape (as shown in FIG. 7 ). Those skilled in the art can set the first filling chamber 140 and the second filling chamber 240 that can ensure the maximum cross-sectional area according to the cross-sectional shape of the pushing catheter, the position and shape of the first guide wire chamber 130 and the second guide wire chamber 230 . It can be understood that in other embodiments, multiple first filling chambers 140 or second filling chambers 240 may be provided in the multi-lumen tube, as long as the distal end of each filling chamber is connected to the inner lumen of the expandable balloon, This can increase the flow rate of filling liquid or gas, thereby increasing the filling and pressure relief speed of the expandable balloon.

Please refer to FIG. 1 again. The balloon catheter also includes a handle 500 located at the proximal end of the catheter body 100 . The handle 500 is provided with a first guidewire port 510, a second guidewire port 520, a first filling port 530 and a second filling port 540. The first guidewire port 510 communicates with the proximal end of the first guidewire lumen 130 . The second guidewire port 520 is connected with the proximal end of the second guidewire lumen 230 . The first filling port 530 communicates with the proximal end of the first filling cavity 140 . The second filling port 540 communicates with the proximal end of the second filling chamber 240.

In this embodiment, the position between the first branch 210 and the second branch 220 in the branch tube body 200 is fixed. That is, the position between the first balloon 300 disposed at the distal end of the first branch 210 and the second balloon 400 disposed at the distal end of the second branch 220 is fixed.

The implementation process of using the balloon catheter provided in this embodiment to dilate bifurcated blood vessels is as follows:

Through percutaneous puncture, after inserting the balloon catheter provided in this embodiment into the patient's body along the guide wire, the catheter is pushed distally by holding the handle 500, and the first branch 210 and the second branch 220 are guided by the respective guide wires. Down, enter the two branch blood vessels at the bifurcation. At this time, the distal end of the working section of the first balloon 300 and the distal end of the working section of the second balloon 400 also enter the two branch blood vessels respectively, while the proximal end of the working section of the first balloon 300 and the proximal end of the working section of the second balloon 400 Then they are located at the bifurcation position of blood vessels at the same time, and the two partially overlap. The first filling port 530 and the second filling port 540 at the proximal end of the handle 500 are respectively connected to the external balloon expansion pressure pump, and the filling liquid enters the first balloon 30 and the second balloon 30 through the first filling chamber 140 and the second filling chamber 240 respectively. Inside the balloon 400, the first balloon 300 and the second balloon 400 are respectively inflated to simultaneously expand the stenotic lesions of the two branch blood vessels. Since the diameter of the proximal end of the working section of the second balloon 400 is smaller than the diameter of the remaining part of the working section, the total outer diameter of the overlapping portion between the proximal end of the first balloon 300 and the proximal end of the second balloon 400 is reduced. Therefore, not only the diameters of the first balloon 300 and the second balloon 400 can adapt to the main branches and branches after bifurcation, but their overlapping portions can also adapt to the diameter of the blood vessels at the bifurcation position to avoid blood vessel tearing at the bifurcation position. .

Compared with the existing technology, the balloon catheter provided by this embodiment has at least the following beneficial effects:

(1) The distal branch tube body can enter multiple branches of the bifurcated blood vessel at the same time, which can expand the stenotic lesion of the bifurcated blood vessel at one time, avoid blood vessel tearing and incomplete expansion of the middle part of the bifurcated blood vessel, and at the same time, it can save operation time and reduce costs. The complexity of the operation avoids the pain caused by the patient being intubated multiple times.

(2) The balloon catheter of this embodiment can be provided with multiple expandable balloons on multiple branches, and can expand multi-segment lesions at one time.

(3) In the balloon catheter of this embodiment, the proximal diameter of the working section of the expandable balloon is smaller than the diameter of the rest of the balloon, which can better adapt to the anatomical characteristics of the bifurcated blood vessels and avoid damage to the blood vessels. The bifurcated position also ensures that the working section has a longer effective length and improves expansion capacity.

Embodiment 2

The structure of the balloon catheter provided in the second embodiment is basically the same as the structure of the balloon catheter provided in the first embodiment. The difference lies in that the structure of the catheter body of the balloon catheter provided in the second embodiment is different from that of the balloon catheter of the first embodiment.

Specifically, in this embodiment, the catheter body includes an outer tube (ie, a first tube body) and at least one inner tube (ie, a second tube body) inserted into the outer tube. The first tube body and the second tube body are fixedly connected together and cannot move relative to each other. The distal end of the inner tube or the distal end of the outer tube is connected to the proximal end of the first branch or the proximal end of the second branch respectively. The outer tube or/and the inner tube are provided with a first guide wire cavity, a second guide wire cavity, a first filling cavity and a second filling cavity that are not connected to each other. In this embodiment, the outer tube has different structures according to the number of inner tubes.

Referring to FIG. 8 , if only one inner tube is installed in the outer tube, the inner cavity of the inner tube can be used as the first guide wire lumen 130 or the second guide wire lumen 230 . The outer tube is a multi-lumen tube with at least three lumens, one of which serves as the first guidewire lumen 130 or the second guidewire lumen 230, and the other two lumens serve as the first filling lumen 140 and the second filling lumen respectively. Cavity 240.

Please refer to Figure 9. Two inner tubes are inserted into the outer tube, and the two inner tubes are arranged roughly in parallel. The lumens of the two inner tubes serve as the first guidewire lumen 130 and the second guidewire lumen 230 respectively. The two areas between the outer tube and the two inner tubes serve as the first filling chamber 140 and the second filling chamber 240 respectively.

Please refer to Figure 10. Three inner tubes can be inserted into the outer tube, and two of the inner tubes are set together. Among the two inner tubes that are set together, the lumen of the inner tube can be used as the first guide wire lumen 130 or the second guide wire lumen 230 . The inner lumen of another independent inner tube serves as the second guidewire lumen 230 or the first guidewire lumen 130 . The gap between the outer tube and the inner tube and the gap between the two set inner tubes serve as the first filling chamber 140 and the second filling chamber 240 respectively.

It can be understood that in other embodiments, at least two lumens can be provided in two parallel-arranged inner tubes, and one lumen in each inner tube serves as the first guidewire lumen 130 or the second guidewire lumen 130 . The guidewire lumen 230 and the other lumen serve as the first filling chamber 140 or the second filling chamber 240 .

It can be understood that in other embodiments, four inner tubes can be installed in the outer tube, at least two of which are arranged in parallel (i.e., side by side), and the remaining inner tubes are arranged with these two side by side. Inner tube set. The lumens of the two inner tubes arranged side by side serve as the first guide wire lumen 130 and the second guide wire lumen 230 respectively, and the gaps between the outer tube and the inner tube and the gaps between the inner tube and the inner tube are respectively As the first filling chamber and the second filling chamber.

It should be understood that the above mutual positional relationship between the inner tube and the outer tube is only an example, and structures suitable for the present invention are within the protection scope of the present invention.

Compared with the existing technology, the balloon catheter of this embodiment has at least the following beneficial effects:

The distal branch tube body can enter multiple branches of the bifurcated blood vessel at the same time, which can expand the narrow lesion of the bifurcated blood vessel at one time, avoid blood vessel tearing and incomplete expansion of the middle part of the bifurcated blood vessel, and at the same time, it can save operation time and reduce the complexity of the operation. , to avoid the pain caused by multiple intubations for patients.

Embodiment 3

The structure of the balloon catheter provided in Embodiment 3 is basically the same as the structure of the balloon catheter provided in Embodiment 1. The difference lies in that the structure of the catheter body of the balloon catheter provided in Embodiment 3 is different from that of the balloon catheter of Embodiment 1.

Specifically, referring to FIG. 11 , the catheter body 100 of the push catheter includes a first tube body 110 and a second tube body 120 . The first tube body 110 and the second tube body 120 can move relative to each other along the axial direction. The distal end of the first tube body 110 is connected to the proximal end of the first branch 210 . The distal end of the second tube body 120 is connected to the proximal end of the second branch 220 . Therefore, the first branch 210 and the second branch 220 in the branch tube body 200 can move in the axial direction and the radial direction at the same time. That is, the position between the first balloon 300 disposed at the distal end of the first branch 210 and the second balloon 400 disposed at the distal end of the second branch 220 can be adjusted. The directions of adjustment are: axial, that is, adjusting the relative positions of the first balloon 300 and the second balloon 400 in the axial direction to adapt to the different distances between the stenotic lesion and the bifurcation in the bifurcated blood vessels; radial, that is, adjusting The first balloon 300 and the second balloon 400 are positioned relative to each other in the radial direction to adapt to the different angles between bifurcated blood vessel branches.

Specifically, the positional relationship between the first tube body 110 and the second tube body 120 can have the following two implementations:

Referring to Figure 11, the first embodiment: the second tube body 120 is movably inserted into the first tube body 110, and the distal side wall of the first tube body 110 has a through hole 111, and the second tube body 120 is The end passes through the through hole 111 and is connected to the second branch 220 . Therefore, when the second tube body 120 moves axially along the first tube body 110, the second branch 220 can be driven to move toward the distal end or the proximal end of the second tube body 120, thereby adjusting the position of the second balloon 400. Adapt to bifurcated blood vessels with different structures and different stenosis positions of bifurcated blood vessels.

The second embodiment: the first tube body 110 and the second tube body 120 are arranged substantially parallel (ie, side by side), and are connected through a limiting member, so that the first tube body 110 and the second tube body 120 Only axial movement will occur between them, no radial movement. There are many ways of limiting members: for example, the limiting member can be a collar provided between the first tube body 110 and the second tube body 120 , or the first tube body 110 and the second tube body 120 can be movably worn together. It is located in the hollow hoop member, thereby limiting only axial movement between the two. The specific shape and axial length of the hoop member are not limited and can be adjusted according to the lengths of the first pipe body 110 and the second pipe body 120 . For example, the hoop member may be circular, elliptical or "8" shaped. The hoop member may also be a tubular body with a certain axial length, or as shown in Figure 13, the first tube body 110 and the third The two tube bodies 120 are set together in the form of a third tube body or the like. It can be understood that, in order to reduce the overall diameter of the balloon catheter, the shapes of the first tube body 110 and the second tube body 120 should cooperate with each other to form a complete, non-angular shape, such as a circle or an ellipse.

Referring to FIG. 12 , the first guide wire cavity 130 , the second guide wire cavity 230 , the first filling cavity 140 and the second filling cavity 240 in the first tube body 110 and the second tube body 120 are respectively arranged independently, that is, the first The guide wire cavity 130 and the first filling cavity 140 are arranged in the first tube body 110 , and the second guide wire cavity 230 and the second filling cavity 240 are arranged in the second tube body 120 .

Please refer to FIG. 11 again. The balloon catheter provided in this embodiment further includes a first catheter seat 600 located at the proximal end of the first tube body 110 and a second catheter seat 500 located at the proximal end of the second tube body 120 . The second catheter adapter 500 is axially movable relative to the first catheter adapter 600 . When the first pipe body 110 and the second pipe body 120 are coaxially assembled, the handle 600 is sleeved outside the first pipe body 110 . When the first tube body 110 and the second tube body 120 are arranged side by side, the first catheter seat 600 and the second catheter seat 500 are arranged independently.

The first tube body 110 is provided with a penetrating first guide wire cavity 130 and a first filling cavity 140 . The second tube body 120 is provided with a penetrating second guidewire cavity 230 and a second filling cavity 240 . The proximal end of the first catheter adapter 600 is provided with a third guidewire port 610 and a third filling port 620. The proximal end of the second catheter adapter 500 is provided with a fourth guidewire port 510 and a fourth filling port 520 . The third guidewire port 610 is connected to the proximal end of the first guidewire lumen 130 . The fourth guidewire port 510 is connected to the proximal end of the second guidewire lumen 230 . The third filling port 620 is connected to the proximal end of the first filling cavity 140 . The fourth filling port 520 is connected to the proximal end of the second filling chamber 240 .

In summary, with the balloon catheter of the present invention, the distal branch tube body can enter multiple branches of the bifurcated blood vessel at the same time, and can expand the stenotic lesion of the bifurcated blood vessel at one time, avoiding blood vessel tearing and incomplete expansion in the middle of the bifurcated blood vessel. At the same time, it can save operation time, reduce the complexity of the operation, and avoid the pain caused by the patient being intubated multiple times.

At the same time, the present invention can expand multi-segment lesions at one time by arranging multiple expandable balloons on multiple branches.

In addition, in the balloon catheter of the present invention, the proximal diameter of the working section of the expandable balloon is smaller than the diameter of the remaining part of the balloon, which can better adapt to the anatomical characteristics of the bifurcated blood vessels and avoid damage to the bifurcated blood vessels. The location can also ensure that the working section has a longer effective length and improve the expansion capacity.

Moreover, the second balloon and the first balloon in the present invention can move relative to each other, so the relative position between the balloons can be adjusted, making the catheter of the present invention more flexible to use. After the second balloon enters the branch, the position of the second balloon can be reasonably adjusted according to the actual location of the lesion so that it can better fit the lesion site.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (7)

1. A balloon catheter, comprising a push catheter and at least two expandable balloons located at the distal end of the push catheter, characterized in that the push catheter includes a catheter body and a branch located at the distal end of the catheter body Pipe body, the branch pipe body at least includes a first branch and a second branch extending in different directions, and the range of the angle between the axial direction of the first branch and the axial direction of the second branch is (0 °, 180°], the expandable balloon includes at least one first balloon disposed at the distal end of the first branch and at least one second balloon disposed at the distal end of the second branch, the The proximal diameter of the working section of at least one of a balloon and the second balloon is smaller than the remaining diameter of the working section of the balloon, and the proximal diameter of the working section of the first balloon and the proximal diameter of the working section of the second balloon are smaller than the diameter of the remaining working section of the balloon. The sum of the proximal diameters of the two balloon working sections is smaller than the sum of the diameters of the remaining parts of the first balloon and the second balloon working sections; The catheter body includes a first tube body and a second tube body. The distal end of the first tube body is connected to the proximal end of the first branch. The distal end of the second tube body is connected to the second branch. The proximal ends are connected; the first tube body and the second tube body only move relative to each other in the axial direction, and the first branch and the second branch move relative to each other in the axial and radial directions at the same time, The relative position between the first balloon disposed at the distal end of the first branch and the second balloon disposed at the distal end of the second branch is adjusted simultaneously in the axial and radial directions; the third The two tube bodies are movably installed in the first tube body, and the side wall of the first tube body near the distal end is provided with a through hole, and the distal end of the second tube body passes through the through hole. out. 2. The balloon catheter according to claim 1, wherein the diameter of the proximal portion of the first balloon or/and the proximal portion of the second balloon ranges from the distal end to the proximal end. slowing shrieking. 3. The balloon catheter according to claim 1, wherein the catheter body is a multi-lumen tube, and a first guide wire lumen and a second guide wire that are not connected to each other are provided in the multi-lumen tube along the axial direction. cavity, a first filling cavity and a second filling cavity; the first guidewire cavity axially penetrates from the proximal end of the catheter body to the distal end of the first branch, and the second guidewire cavity extends from the catheter body to the distal end of the first branch. The proximal end axially penetrates to the distal end of the second branch; the distal end of the first filling cavity is connected to the inner cavity of the first balloon, and the distal end of the second filling cavity is connected to the second balloon. The inner lumen of the sac is connected. 4. The balloon catheter according to claim 3, wherein the balloon catheter further includes a handle provided at the proximal end of the catheter body, and the proximal end of the handle is provided with a first guide wire port, a third Two guidewire ports, a first filling port and a second filling port, the first guidewire port is connected to the proximal end of the first guidewire lumen, the second guidewire port is connected to the second guidewire lumen The proximal end is connected, the first filling port is connected with the proximal end of the first filling cavity, and the second filling port is connected with the proximal end of the second filling cavity. 5. The balloon catheter according to claim 1, characterized in that the first tube body and the second tube body are arranged side by side, and the first tube body and the second tube body are threaded together. in the hollow hoop piece. 6. The balloon catheter according to claim 1, wherein the balloon catheter further includes a first catheter seat located at the proximal end of the first tube body and a first catheter seat located at the proximal end of the second tube body. a second catheter seat, and the second catheter seat moves axially relative to the first catheter seat. 7. The balloon catheter according to claim 6, wherein the first tube body is provided with a first guide wire cavity and a first filling cavity, and the second tube body is provided with a second penetrating cavity. A guide wire lumen and a second filling cavity; the proximal end of the first catheter holder is provided with a third guide wire port and a third filling port, and the proximal end of the second catheter holder is provided with a fourth guide wire port and a fourth a filling port, the third guidewire port is connected to the proximal end of the first guidewire lumen, the fourth guidewire port is connected to the proximal end of the second guidewire lumen, and the third filling port is connected to the proximal end of the first guidewire lumen. The proximal end of the first filling cavity is connected, and the fourth filling port is connected with the proximal end of the second filling cavity.