CN219847793U

CN219847793U - Balloon dilation catheter

Info

Publication number: CN219847793U
Application number: CN202320770836.4U
Authority: CN
Inventors: 李慧怡; 黄君仪; 胡景就
Original assignee: Guangdong Bomai Medical Technology Co Ltd
Current assignee: Guangdong Bomai Medical Technology Co Ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-10-20
Anticipated expiration: 2033-04-07

Abstract

The utility model provides a balloon dilation catheter, and relates to the technical field of medical instruments. The balloon dilation catheter provided by the embodiment of the utility model comprises an outer tube assembly, an inner tube, a catheter connection assembly and a balloon. The shoulders with the length of 0.4mm-1.7mm are arranged at the two ends of the balloon main body, so that the balloon main body is promoted to intensively expand, the shoulders of the balloon cannot bulge, the accurate expansion of the balloon to coronary vessels is realized, and the situation that the diameters of the proximal end and the distal end of the balloon are larger than the diameter of the balloon main body due to severe calcification of the vessels during expansion, so that a dog bone effect is generated and vascular injury is caused is avoided. In addition, after the stent is implanted, as the length of the shoulder is 0.4mm-1.7mm, the edge of the balloon can be accurately attached to the edge of the stent and is flush with the stent, thrombus can not be caused by insufficient expansion of the balloon, and vascular interlayer can not be generated at the edge of the stent because of swelling of the shoulder of the balloon.

Description

Balloon dilation catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a balloon dilation catheter.

Background

Coronary angiogenic atherosclerotic lesions may cause stenosis or blockage of the lumen of the blood vessel, resulting in ischemia, hypoxia or necrosis of the heart muscle, ultimately leading to coronary atherosclerotic heart disease. Percutaneous Transluminal Coronary Angioplasty (PTCA) is the primary treatment for coronary atherosclerotic heart disease. During PTCA surgery, a custom-made balloon catheter is delivered to the coronary stenosis via the peripheral artery (femoral or radial), and the inflated balloon dilates the stenosed lumen, improving blood flow.

When the balloon expands the blood vessel with severe calcification lesion, the diameter of the distal end and the proximal end of the balloon is larger than that of the working area of the balloon due to severe calcification of the blood vessel, so that the dog bone effect is easy to occur, the blood vessel is excessively expanded, and the blood vessel is damaged. In addition, internal thrombosis and vascular restenosis after stent implantation are the primary mechanisms of failure in coronary lesion treatment, and insufficient balloon expansion is an important factor in causing thrombosis and restenosis after stent implantation.

Disclosure of Invention

The utility model provides a balloon dilation catheter which is used for solving the defects of failure in treatment of coronary lesions and vascular injury caused by excessive dilation due to insufficient balloon dilation in the prior art and realizing accurate balloon dilation.

The present utility model provides a balloon dilation catheter comprising:

the middle part of the outer tube assembly is provided with a guide wire port;

the balloon is connected to the distal end of the outer tube assembly, the balloon comprises a balloon main body and shoulders which are arranged at two ends of the balloon main body and communicated with the balloon main body, and the interior of the balloon is communicated with the interior of the outer tube assembly; the length of the shoulder is 0.4mm-1.7mm;

the inner tube penetrates through the balloon and the inner part of the distal end of the outer tube assembly, a guide wire cavity communicated with the guide wire port is formed in the inner tube, the distal end of the inner tube extends out of the distal end of the balloon and forms a tip, and a guide wire hole communicated with the guide wire cavity is formed in the tip;

a catheter connection assembly in communication with the proximal end of the outer tube assembly.

According to the balloon dilation catheter provided by the embodiment of the utility model, the shoulder is in the shape of a truncated cone, the balloon body is in the shape of a cylinder, and an included angle between a generatrix of the truncated cone and a generatrix of the cylinder is 61-79 degrees.

According to the balloon dilation catheter provided by the embodiment of the utility model, the outer tube assembly comprises a distal outer tube and a proximal outer tube which are sequentially connected.

According to the balloon dilation catheter provided by the embodiment of the utility model, the distal outer tube is made of a high polymer material, the proximal outer tube is made of stainless steel, a distal core wire with one end connected with the proximal outer tube is arranged in the distal end of the proximal outer tube, and the other end of the distal core wire extends into the proximal end of the distal outer tube.

According to the balloon dilation catheter provided by the embodiment of the utility model, the surface of the proximal outer tube is provided with the high polymer material coating, and the balloon is made of a non-compliant material.

According to the balloon dilation catheter provided by the embodiment of the utility model, the outer circumferential surfaces of the tip and the distal end of the balloon are provided with hydrophilic coatings.

According to an embodiment of the present utility model, there is provided a balloon dilation catheter, further comprising:

the marking assembly comprises two marking rings, and the two marking rings are arranged on the outer circumferential surface of the inner tube at intervals.

According to the balloon dilation catheter provided by the embodiment of the utility model, the tip is a cone.

According to the balloon dilation catheter provided by the embodiment of the utility model, the inner tube comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially arranged from inside to outside, the inner surface layer and the intermediate layer are both made of plastics, the density of the inner surface layer is higher than that of the outer surface layer, and the outer surface layer is made of polymer materials.

According to an embodiment of the present utility model, there is provided a balloon dilation catheter, the catheter connection assembly comprising:

a catheter hub in communication with the proximal end of the outer tube assembly;

the catheter reinforcing seat is sleeved at the proximal end of the outer tube assembly and is connected with the catheter seat.

According to the balloon dilation catheter provided by the embodiment of the utility model, the shoulders with the length of 0.4-1.7 mm are arranged at the two ends of the balloon main body, so that the balloon main body is promoted to be concentrated dilated, the shoulders of the balloon cannot bulge, the accurate dilation of the balloon on coronary vessels is realized, and the problems that the diameters of the proximal end and the distal end of the balloon are larger than the diameter of the balloon main body due to severe calcification of the vessels during dilation, a dog bone effect is generated, and vascular injury is caused are avoided. In addition, after the stent is implanted, as the length of the shoulder is 0.4mm-1.7mm, the edge of the balloon can be accurately attached to the edge of the stent and is flush with the stent, thrombus can not be caused by insufficient expansion of the balloon, and vascular interlayer can not be generated at the edge of the stent because of swelling of the shoulder of the balloon.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a balloon dilation catheter according to an embodiment of the present utility model in a front view;

fig. 2 is a schematic diagram of a front view structure of a balloon according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a cross-sectional front view of a balloon according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional front view of a balloon with insufficient expansion in the prior art;

fig. 5 is a schematic cross-sectional front view of a balloon of the prior art.

Reference numerals:

100. an outer tube assembly; 110. a guide wire port; 120. a distal outer tube; 130. a proximal outer tube; 200. an inner tube; 210. a tip; 300. a catheter connection assembly; 310. a catheter holder; 320. a catheter reinforcing seat; 400. a balloon; 410. a balloon body; 420. a shoulder; 500. a marking assembly; 510. a marker ring; 600. coronary artery blood vessel; 700. and (3) a bracket.

Detailed Description

Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present utility model will be understood in detail by those of ordinary skill in the art.

In embodiments of the utility model, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

A balloon dilation catheter of an embodiment of the present utility model is described below in connection with fig. 1-5.

Fig. 1 illustrates a schematic front view of a balloon dilation catheter according to an embodiment of the present utility model, and fig. 2 illustrates a schematic front view of a balloon according to an embodiment of the present utility model, as shown in fig. 1 and fig. 2, the balloon dilation catheter according to an embodiment of the present utility model includes an outer tube assembly 100, an inner tube 200, a catheter connection assembly 300, and a balloon 400. A guidewire port 110 is provided in the middle of the outer tube assembly 100. The balloon 400 is connected to the distal end of the outer tube assembly 100, the balloon 400 includes a balloon body 410 and shoulders 420 provided at both ends of the balloon body 410 and communicating with the balloon body 410, and the interior of the balloon 400 communicates with the interior of the outer tube assembly 100. The shoulder 420 has a length of 0.4mm-1.7mm. The inner tube 200 is threaded through the balloon 400 and the interior of the distal end of the outer tube assembly 100, the interior of the inner tube 200 having a guidewire lumen in communication with the guidewire port 110, the distal end of the inner tube 200 extending beyond the distal end of the balloon 400 and forming a tip 210, the tip 210 forming a guidewire aperture in communication with the guidewire lumen. Catheter connection assembly 300 communicates with the proximal end of outer tube assembly 100.

According to the balloon dilation catheter provided by the embodiment of the utility model, the shoulders 420 with the length of 0.4-1.7 mm are arranged at the two ends of the balloon main body 410, so that the balloon main body 410 is promoted to be intensively dilated, the shoulders 420 of the balloon 400 cannot bulge, the accurate dilation of the balloon 400 on the coronary artery blood vessel 600 is realized, and the problems that the diameters of the proximal end and the distal end of the balloon 400 are larger than the diameter of the balloon main body 410 due to severe calcification of the blood vessel during dilation, and a dog bone effect is generated, so that the blood vessel is damaged are avoided. In addition, after the stent is implanted, since the length of the shoulder 420 is 0.4mm-1.7mm, the edge of the balloon 400 can be accurately attached to the edge of the stent and is flush with the stent, thrombus can not be caused by insufficient expansion of the balloon 400, and a vascular interlayer can not be generated at the edge of the stent because the shoulder 420 of the balloon 400 bulges.

It should be noted herein that the distal and proximal ends of the present utility model are defined with respect to the operator. The end close to the operator is a proximal end, and the end far away from the operator is a distal end.

The shoulder 420 at the proximal end of the balloon body 410 is in communication with the balloon body 410, and the shoulder 420 at the proximal end of the balloon body 410 is in communication with the flow path, so that the balloon body 410 is in communication with the flow path. When the balloon 400 is filled with a medium, the medium in the flow channel enters the balloon body 410 through the shoulder 420 at the proximal end of the balloon 400, so that the balloon 400 is inflated, and the expansion of the coronary artery vessel 600 by the balloon body 410 is realized. The length of the shoulder 420 refers to the length of the shoulder 420 along the axial direction of the balloon body 410 (i.e., length b in fig. 2).

In the embodiment of the present utility model, the tip 210 is made of a flexible polymer material, and the inner tube 200 is made of a polymer material with good flexibility, such as Pebax (polyether block polyamide) and nylon. The tip 210 is connected to the distal end of the inner tube 200 by welding or bonding, and the distal end of the inner tube 200 is connected to the shoulder 420 of the distal end of the balloon 400; or the tip 210 may be connected to both the distal end of the inner tube 200 and the shoulder 420 at the distal end of the balloon 400.

In an embodiment of the present utility model, the shoulder 420 is a truncated cone, the balloon body 410 is a cylinder, and an included angle between a generatrix of the truncated cone and a generatrix of the cylinder is 61 ° -79 ° (i.e., an included angle a in fig. 2). By setting the included angle between the outer circumferential surface of the shoulder 420 and the outer circumferential surface of the balloon body 410 to 61 ° -79 °, the shoulder 420 at both ends of the balloon body 410 is further shortened, the effect of accurately expanding the blood vessel of the balloon 400 is improved, and the technical problem of insufficient expansion or excessive expansion of the balloon 400 is solved.

In an embodiment of the present utility model, outer tube assembly 100 includes a distal outer tube 120 and a proximal outer tube 130 connected in sequence. The proximal end of the inner tube 200 is threaded into the distal end of the distal outer tube 120, and the guidewire port 110 is located proximal of the distal outer tube 120. The distal end of the proximal outer tube 130 communicates with the proximal end of the distal outer tube 120, and the proximal end of the proximal outer tube 130 communicates with the catheter connection assembly 300. The proximal end of the inner tube 200 is disposed through the interior of the distal outer tube 120 and fixedly connected to the distal outer tube 120. Specifically, the inner tube 200 and the distal outer tube 120 may be connected by hot air welding or bonding, and the distal end of the distal outer tube 120 communicates with the shoulder 420 at the proximal end of the balloon 400. The distal outer tube 120 and the proximal outer tube 130 may also be connected by hot air welding or bonding, so that a smooth transition between the distal outer tube 120 and the proximal outer tube 130 may be achieved, and the liquid in the proximal outer tube 130 may smoothly enter the distal outer tube 120. By providing the distal outer tube 120 and the proximal outer tube 130, the hardness of the proximal outer tube 130 is greater than the hardness of the distal end 120, and by mating the distal outer tube 120 and the proximal outer tube 130, the convenience of the balloon dilation catheter can be enhanced.

In the embodiment of the present utility model, the distal outer tube 120 is made of a polymer material, the proximal outer tube 130 is made of stainless steel, a distal core wire with one end connected to the proximal outer tube is disposed inside the distal end of the proximal outer tube, and the other end of the distal core wire extends to the inside of the proximal end of the distal outer tube. Specifically, the distal outer tube 120 may be made of polymer materials with good flexibility such as Pebax (polyether block polyamide) and nylon. Because the high polymer material has good toughness and high stainless steel strength, when the distal outer tube 120 is made of high polymer material and the proximal outer tube 130 is made of stainless steel, the outer tube assembly 100 has good toughness and high strength, and the balloon dilation catheter has enhanced capability of adapting to complex working environments. In addition, the stainless steel has good corrosion resistance, and can prolong the service life of the balloon dilation catheter.

In an embodiment of the present utility model, the surface of the proximal outer tube 130 is provided with a coating of a polymeric material, such as polytetrafluoroethylene, and the balloon is made of a non-compliant material. By providing a polymeric coating on the surface of the proximal outer tube 130, the proximal outer tube 130 is prevented from adhering to other substances during use and from contaminating the balloon dilation catheter during use. The balloon 400 is blow molded from a non-compliant material using a molding die. The dimensions of balloon 400 can be precisely controlled due to the high tensile strength and relatively low elongation of the non-compliant material. The balloon 400 maintains its designed size and shape even under high pressure, ensuring that the balloon 400 does not continue to expand after opening the occlusion, avoiding damaging the artery.

In an embodiment of the present utility model, the outer circumferential surfaces of the distal ends of the tip 210 and the balloon 400 are provided with a hydrophilic coating. The hydrophilic coating can improve the biocompatibility of the tip 210 and the outer circumferential surface of the distal end of the balloon 400, reduce the friction force with the blood vessel in the use process of the balloon dilation catheter, and avoid the damage of the blood vessel. In addition, adsorption of cells, proteins, etc. to the distal peripheral surface of the tip 210 and the balloon 400 can be avoided by providing a hydrophilic coating.

In an embodiment of the present utility model, the balloon dilation catheter further comprises a marker assembly 500, the marker assembly 500 comprising two marker rings 510, the two marker rings 510 being spaced apart from the outer circumferential surface of the inner tube 200. The positions of the two marking rings 510 at the outer circumferential surface of the inner tube 200 correspond to the positions of both ends of the balloon body 410 so that medical staff can accurately recognize the specific position of the balloon body 410 through an external X-ray imaging apparatus. The position of the balloon body 410 can be determined by observing the positions of the two marker rings 510 in the blood vessel, so that the balloon body 410 can accurately reach the lesion position, and the blood vessel can be accurately dilated.

In an embodiment of the present utility model, tip 210 is a cone, and the cross-section of tip 210 decreases from the proximal end to the distal end of tip 210 to facilitate the entry of the balloon dilation catheter into the vessel and dilation of the vessel.

In the embodiment of the present utility model, the inner tube 200 includes an inner surface layer, an intermediate layer and an outer surface layer sequentially disposed from inside to outside, wherein the inner surface layer and the intermediate layer are both made of plastic, the density of the inner surface layer is higher than that of the outer surface layer, and the outer surface layer is made of a polymer material. The inner tube 200 having a three-layer structure is extruded in a co-extrusion die through an extruder.

In an embodiment of the present utility model, catheter connection assembly 300 includes catheter hub 310 and catheter hub 320, catheter hub 310 being in communication with the proximal end of outer tube assembly 100, catheter hub 320 being sleeved over the proximal end of outer tube assembly 100 and connected to catheter hub 310. Catheter hub 310 may be in communication with a media injection device. Specifically, the catheter hub 310 may be glued to the proximal end of the proximal outer tube 130. The medium injection device injects medium into the outer tube assembly 100 through the catheter hub 310, and the medium enters the balloon 400 through the flow channel, so that the balloon 400 is inflated, and the expansion of the blood vessel of the balloon 400 is realized. The catheter hub 320 can strengthen the connection between the catheter hub 310 and the proximal end of the outer tube assembly 100, and prevent the connection between the catheter hub 310 and the proximal end of the outer tube assembly 100 from being damaged by external forces. Specifically, the catheter reinforcement holder 320 is sleeved on the proximal end of the proximal outer tube 130 and is connected to the catheter holder 310, so as to protect the connection between the catheter holder 310 and the proximal end of the proximal outer tube 130. The catheter hub 320 and the catheter hub 310 may be integrally formed to simplify the structure of the balloon dilation catheter.

In an embodiment of the present utility model, catheter hub 310 is provided with a luer fitting in communication with catheter hub 310. When the medium needs to be injected, the luer connector is communicated with the external luer connector, so that the convenience of injecting the medium is improved, and the balloon 400 is promoted to expand the blood vessel rapidly.

One specific embodiment of the present utility model is described below in conjunction with fig. 1 and 2, as shown in fig. 1 and 2, a balloon dilation catheter includes an outer tube assembly 100, an inner tube 200, a catheter connection assembly 300, a balloon 400, and a marker assembly 500. A guidewire port 110 is provided in the middle of the outer tube assembly 100. The balloon 400 is connected to the distal end of the outer tube assembly 100, the balloon 400 includes a balloon body 410 and shoulders 420 provided at both ends of the balloon body 410 and communicating with the balloon body 410, and the interior of the balloon 400 communicates with the interior of the outer tube assembly 100. The shoulder 420 has a length of 0.4mm-1.7mm. The inner tube 200 is threaded through the balloon 400 and the interior of the distal end of the outer tube assembly 100, the interior of the inner tube 200 having a guidewire lumen in communication with the guidewire port 110, the distal end of the inner tube 200 extending beyond the distal end of the balloon 400 and forming a tip 210, the tip 210 forming a guidewire aperture in communication with the guidewire lumen. Catheter connection assembly 300 communicates with the proximal end of outer tube assembly 100. Shoulder 420 is a circular truncated cone, balloon body 410 is a cylinder, and the included angle between the generatrix of the circular truncated cone and the generatrix of the cylinder is 61 °. The balloon 400 is made of a non-compliant material. The tip 210 and the outer circumferential surface of the distal end of the balloon 400 are provided with a hydrophilic coating. The tip 210 is in the form of a cone, and the cross-section of the tip 210 decreases from the proximal end to the distal end of the tip 210. The inner tube 200 comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially arranged from inside to outside, wherein the inner surface layer and the intermediate layer are made of plastics, the density of the inner surface layer is higher than that of the outer surface layer, and the outer surface layer is made of polymer materials.

The outer tube assembly 100 includes a distal outer tube 120 and a proximal outer tube 130 connected in sequence. The proximal end of the inner tube 200 is threaded into the distal end of the distal outer tube 120, and the guidewire port 110 is located proximal of the distal outer tube 120. The distal end of the proximal outer tube 130 communicates with the proximal end of the distal outer tube 120, and the proximal end of the proximal outer tube 130 communicates with the catheter connection assembly 300. The proximal end of the inner tube 200 is disposed through the interior of the distal outer tube 120 and fixedly connected to the distal outer tube 120. The distal outer tube 120 is made of a polymer material, the proximal outer tube 130 is made of stainless steel, a distal core wire with one end connected with the proximal outer tube is arranged in the distal end of the proximal outer tube, and the other end of the distal core wire extends to the inside of the proximal end of the distal outer tube. The surface of the proximal outer tube 130 is provided with a polytetrafluoroethylene coating.

The marking assembly 500 includes two marking rings 510, and the two marking rings 510 are disposed at intervals on the outer circumferential surface of the inner tube 200. Catheter connection assembly 300 includes catheter hub 310 and catheter hub 320, catheter hub 310 being in communication with the proximal end of proximal outer tube 130. The catheter reinforcement hub 320 is sleeved on the proximal end of the proximal outer tube 130 and is connected to the catheter hub 310.

Working principle of balloon dilation catheter:

after the PTCA procedure is prepared preoperatively, a guidewire is threaded into the guidewire port of catheter tip 210, passed through the guidewire lumen of inner tube 200, and then threaded out of guidewire port 110. The balloon dilation catheter is guided by a guidewire into the coronary vessel 600 and the balloon 400 is delivered to the site to be dilated, i.e. the lesion site, according to the marker ring 510 on the inner tube 200.

After the prescribed position is reached, medium is injected into distal outer tube 120 through catheter hub 310. Media enters the flow channel from the distal outer tube 120 and eventually enters the balloon 400. With the increase of media, the balloon 400 is continuously inflated to enlarge the lumen of the blood vessel, and the stent 700 is attached to the wall of the blood vessel, so that the accurate expansion of the coronary artery blood vessel 600 is realized. After the expansion is completed, the balloon dilation catheter is withdrawn, and the operation is completed.

Fig. 4 illustrates a schematic cross-sectional front view of a balloon with insufficient expansion in the prior art, and as shown in fig. 4, when the conventional balloon 400 is not expanded sufficiently, the gap between both ends of the balloon 400 and the coronary artery 600 is too large, and the stent 700 cannot exert a good expansion effect. The ends of the stent 700 do not abut against the vessel wall, and thus, there is a risk that thrombus or the like may occur easily over time. Fig. 5 illustrates a schematic cross-sectional front view of a balloon that is excessively expanded in the prior art, and as shown in fig. 5, when the balloon 400 is excessively expanded, both ends of the balloon 400 bulge, a dog bone effect is easily generated, a blood vessel interlayer is generated at the edge of the stent 700, and a blood vessel is damaged. Fig. 3 illustrates a schematic diagram of a front view cross-section structure of a balloon provided in an embodiment of the present utility model, as shown in fig. 3, when the balloon dilation catheter provided in an embodiment of the present utility model is applied, since the shoulder 420 of the balloon 400 is 0.4mm-1.7mm, the shoulder 420 is in a truncated cone shape, the balloon body 410 is in a cylindrical shape, an included angle between a generatrix of the truncated cone and a generatrix of the cylindrical body is 61 ° -79 °, the balloon 400 drives the stent 700 to achieve precise dilation after being inflated, and the diameter of the shoulder 420 is smaller than or equal to the diameter of the balloon body 410, so that the balloon dilation catheter not only maintains sufficient dilation, but also avoids occurrence of dog bone effect or vascular dissection, and damage to blood vessels.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A balloon dilation catheter comprising:

the middle part of the outer tube assembly is provided with a guide wire port;

2. The balloon dilation catheter according to claim 1 wherein the shoulder is a truncated cone and the balloon body is a cylinder, an included angle between a generatrix of the truncated cone and a generatrix of the cylinder being 61 ° -79 °.

3. The balloon dilation catheter according to claim 1 wherein the outer tube assembly comprises a distal outer tube and a proximal outer tube connected in sequence.

4. The balloon dilation catheter according to claim 3 wherein the distal outer tube is made of a high molecular material, the proximal outer tube is made of stainless steel, a distal core wire with one end connected with the proximal outer tube is arranged inside the distal end of the proximal outer tube, and the other end of the distal core wire extends to the inside of the proximal end of the distal outer tube.

5. The balloon dilation catheter according to claim 3 wherein a surface of the proximal outer tube is provided with a coating of polymeric material and wherein the balloon is of a non-compliant material.

6. The balloon dilation catheter according to any one of claims 1-4 wherein the tip and an outer peripheral surface of a distal end of the balloon are provided with a hydrophilic coating.

7. The balloon dilation catheter according to any one of claims 1 to 4 further comprising:

8. The balloon dilation catheter according to any one of claims 1 to 4 wherein the tip is a cone.

9. The balloon dilation catheter according to any one of claims 1 to 4 wherein the inner tube comprises an inner surface layer, an intermediate layer and an outer surface layer which are sequentially arranged from inside to outside, wherein materials of the inner surface layer and the intermediate layer are plastics, the density of the inner surface layer is higher than that of the outer surface layer, and the material of the outer surface layer is a polymer material.

10. The balloon dilation catheter according to any one of claims 1 to 4 wherein the catheter connection assembly comprises: