Balloon dilatation catheter

Abstract

The present application provides a balloon dilatation catheter, comprising a multi-lumen tube and a balloon, wherein the multi-lumen tube is provided with a guide wire lumen and at least one liquid passage lumen, the balloon is connected to the liquid outlet end of the multi-lumen tube, a liquid filling cavity is formed between the balloon and the multi-lumen tube, a section of the multi-lumen tube located in the liquid filling cavity is provided with a plurality of liquid outlet areas, the plurality of liquid outlet areas are arranged along the axial direction of the multi-lumen tube, each liquid outlet area is provided with at least one liquid outlet hole, and the liquid outlet hole connects the liquid passage lumen and the liquid filling cavity. The balloon dilatation catheter of the present application can uniformly expand the balloon, thereby reducing the treatment cost.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a balloon dilatation catheter. Background Art

[0002] Percutaneous transluminal angioplasty (PTA) is a minimally invasive vascular dilation procedure for treating vascular stenosis and occlusion in the human body. It refers to the use of percutaneous puncture technology to insert a balloon dilation catheter into the narrow part of the blood vessel, pressurize the balloon under the guidance and monitoring of medical imaging equipment, and mechanically expand the atherosclerotic plaque or thrombus in the blood vessel to deform or expand the blood vessel itself, thereby changing the diameter of the blood vessel and achieving blood circulation reconstruction. PTA is a major breakthrough in the treatment of vascular diseases. The main mechanism of balloon angioplasty is that balloon dilation separates the narrow and hardened intima, while destroying the smooth muscle force layer and collagen fibers of the media, causing the atherosclerotic plaque to break and the media to stretch. Therefore, balloon angioplasty is a method of treating arteriosclerosis obliterans by mechanical dilation leading to vascular remodeling. It can also be used with implants, such as metal stents. Therefore, balloon dilation catheters are indispensable tools in this type of surgery.

[0003] Most existing balloon dilatation catheters have an expandable balloon at the distal end of a catheter with a certain axial length. The balloon is expanded by injecting physiological saline or contrast fluid to open the diseased part of the blood vessel to achieve the purpose of treatment. When a traditional balloon dilatation catheter is filled with an implant, the liquid enters the interior from one end of the balloon, causing the balloon to expand locally first, resulting in uneven balloon expansion. When treating large lesions, a balloon with a large diameter is required. This uneven expansion method will result in the shortcomings of long filling and decompression time of the large balloon, stent displacement, and inability to locate the lesion well. Summary of the invention

[0004] In order to solve the above-mentioned defects existing in the prior art, the balloon dilatation catheter provided in the present application can evenly expand the balloon and reduce the treatment cost.

[0005] The present application provides a balloon dilatation catheter, comprising a multi-lumen tube and a balloon, wherein a guidewire lumen and at least one liquid passage lumen are arranged in the multi-lumen tube, the balloon is connected to the liquid outlet end of the multi-lumen tube, a liquid-filled cavity is formed between the balloon and the multi-lumen tube, a section of the multi-lumen tube located in the liquid-filled cavity is provided with a plurality of liquid outlet areas, the plurality of liquid outlet areas are arranged axially along the multi-lumen tube, each liquid outlet area is provided with at least one liquid outlet hole, and the liquid outlet hole connects the liquid passage and the liquid-filled cavity.

[0006] Optionally, the liquid outlet hole is arranged on the tube wall of the multi-lumen tube, and penetrates the tube wall to communicate with the liquid passage.

[0007] Optionally, a plurality of the liquid passage channels are provided in the multi-lumen tube, and each of the liquid outlet areas is provided with a plurality of liquid outlet holes, and each of the liquid outlet holes is respectively connected to each of the liquid passage channels.

[0008] Optionally, at least two of the liquid passages are arranged opposite to each other along the radial direction of the multi-lumen tube.

[0009] Optionally, the balloon includes a first connecting segment, a second connecting segment and an intermediate straight segment, the first connecting segment and the second connecting segment are fixed to the multi-lumen tube in an opposite arrangement, the intermediate straight segment is connected between the first connecting segment and the second connecting segment, and the multiple liquid outlet areas on the multi-lumen tube are located in the area covered by the first connecting segment, the intermediate straight segment and the second connecting segment, or the multiple liquid outlet areas on the multi-lumen tube are only located in the area covered by the intermediate straight segment.

[0010] Optionally, the inner diameters of the middle straight section along the axial direction of the multi-lumen tube are the same at all locations, the middle straight section includes a first straight portion, a second straight portion and a third straight portion, the second straight portion is connected between the first straight portion and the third straight portion, the first straight portion is connected to the first connecting segment, the third straight portion is connected to the second connecting segment, and the multiple liquid outlet areas on the multi-lumen tube are only located in the area covered by the second straight portion.

[0011] Optionally, a coating is provided on the tube wall of the multi-lumen tube located in the liquid-filled cavity, the coating covers all or part of the liquid outlet holes, and the coating is soluble in a water-soluble liquid.

[0012] Optionally, the number of the liquid outlet areas is 3 to 100.

[0013] Optionally, the inner diameter of the liquid outlet hole is 0.1 mm to 1 mm.

[0014] Optionally, the end of the multi-lumen tube includes a guide wire end face and multiple liquid passing end faces, the guide wire end face is located outside the liquid-filled cavity, the guide wire cavity passes through the guide wire end face, the multiple liquid passing end faces are located in the liquid-filled cavity, the multiple liquid passing end faces are arranged in a stepped manner along the axial direction of the multi-lumen tube, and the multi-lumen tube is provided with multiple liquid passing cavities extending to each of the liquid passing end faces, and the liquid outlet hole passes through the liquid passing end face and is connected to the liquid passing cavity.

[0015] Optionally, the plurality of liquid-passing end faces include a first end face and a second end face, the vertical distance of the second end face compared to the through-wire end face is greater than the vertical distance of the first end face compared to the through-wire end face, the first end face is provided with at least one liquid outlet hole, at least one liquid-passing cavity extends to the first end face, and the second end face is provided with at least one liquid outlet hole, at least one liquid-passing cavity extends to the second end face.

[0016] Optionally, the balloon dilatation catheter comprises at least one of the following:

[0017] The plurality of liquid-passing end faces further include a third end face, the vertical distance between the third end face and the through-wire end face is greater than the vertical distance between the second end face and the through-wire end face, the third end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the third end face;

[0018] The multiple liquid-passing end faces also include a fourth end face, the vertical distance between the fourth end face and the through-wire end face is greater than the vertical distance between the third end face and the through-wire end face, the fourth end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the fourth end face.

[0019] Optionally, the balloon dilatation catheter also includes a connecting piece and a stress diffusion tube, the connecting piece is connected to the proximal end of the multi-lumen tube, the connecting piece includes a guide wire interface and a liquid inlet interface, the guide wire interface is connected to the guide wire cavity, the liquid inlet interface is connected to each of the liquid cavities, one end of the stress diffusion tube is connected to the tube wall of the multi-lumen tube, and the other end of the stress diffusion tube is connected to the connecting piece.

[0020] Optionally, the balloon dilatation catheter further includes a first developing ring and a second developing ring, wherein the first developing ring and the second developing ring are located in the liquid-filled cavity and fixed on the multi-lumen tube.

[0021] The balloon dilatation catheter of the present application is provided with a plurality of liquid outlet holes along the axial direction on the multi-lumen tube, so that the liquid in the liquid passage can be discharged from the plurality of liquid outlet holes at multiple points, so as to achieve the effect of uniform axial expansion of the balloon, realize the expansion of the balloon for vascular shaping, or release the implant carried on the balloon. When the balloon is filled with the implant product, the contrast fluid is discharged from the plurality of liquid outlet holes, so that the balloon is uniformly expanded, the implant is positioned, and the release is accurate. In addition, when the balloon is expanded, the existing length of the implant carried (such as a stent or a coated stent) will not be changed, and the implant carried will not be shortened, which will affect the doctor's judgment, increase the operation time and risk, and reduce the patient's treatment cost and physical burden. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the balloon dilatation catheter of the first embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the balloon dilatation catheter of the first embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the balloon dilatation catheter of the second embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the balloon dilatation catheter of the third embodiment of the present application.

[0026] Figure 5 It is a schematic diagram of the end surface structure of the multi-lumen tube of the fourth embodiment of the present application.

[0027] Figure 6 It is a schematic cross-sectional structural diagram of a multi-lumen tube according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0028] The present application provides a balloon dilatation catheter.

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] To facilitate understanding by those skilled in the art, the present application describes the specific implementation process of the technical solution provided by the present application through the following embodiments.

[0031] First embodiment

[0032] Figure 1 is a schematic structural diagram of a balloon dilatation catheter according to a first embodiment of the present application, Figure 2 FIG. 1 is a partial cross-sectional structural diagram of a balloon dilatation catheter according to a first embodiment of the present application. Figure 1 and Figure 2 As shown, the balloon dilatation catheter includes a multi-lumen tube 11 and a balloon 12. The multi-lumen tube 11 is provided with a guide wire lumen 102 and at least one liquid passage lumen 103. The balloon 12 is connected to the liquid outlet end of the multi-lumen tube 11. A liquid-filled cavity 101 is formed between the balloon 12 and the multi-lumen tube 11. The section of the multi-lumen tube 11 located in the liquid-filled cavity 101 is provided with a plurality of liquid outlet areas. The plurality of liquid outlet areas are arranged along the axial direction of the multi-lumen tube 11. Each liquid outlet area is provided with at least one liquid outlet hole 104. The liquid outlet hole 104 connects the liquid passage 103 with the liquid-filled cavity 101. In this embodiment, openings are provided at both ends of the balloon 12. The multi-lumen tube 11 passes through the two openings of the balloon 12. The balloon 12 is fixed to the multi-lumen tube 11 by heat melting to achieve the closure of the two openings of the balloon 12.

[0033] The balloon dilatation catheter of the present application is provided with a plurality of liquid outlet holes 104 along the axial direction on the multi-lumen tube 11, so that the liquid in the liquid passage 103 can be discharged from the plurality of liquid outlet holes 104 at multiple points, so as to achieve the effect of uniform axial expansion of the balloon 12, realize the expansion of the balloon 12 for vascular shaping, or release the implant carried on the balloon 12. When the balloon 12 is filled with the implant product, the contrast fluid is discharged from the plurality of liquid outlet holes 104, so that the balloon 12 is uniformly expanded, the implant is positioned, and the release is accurate. In addition, when the balloon 12 is expanded, the existing length of the implant carried (such as a stent or a coated stent) will not be changed, and the implant carried will not be shortened, which will affect the doctor's judgment, increase the operation time and risk, and reduce the patient's treatment cost and physical burden.

[0034] Optionally, the balloon dilatation catheter further includes a first developing ring 13 and a second developing ring 14, which are located in the liquid filling cavity 101 and fixed on the multi-lumen tube 11. In this embodiment, the first developing ring 13 and the second developing ring 14 are made of materials such as platinum-iridium alloy, and their function is to develop, so as to facilitate finding the product position during the operation.

[0035] Optionally, the end of the multi-lumen tube 11 extending out of the balloon 12 is tapered, which can reduce damage to blood vessels during use.

[0036] Optionally, the multi-lumen tube 11 is made of polymer material.

[0037] Optionally, the balloon 12 is made of a polymer material, such as nylon 12 or pebax, but is not limited thereto.

[0038] Alternatively, if Figure 2 As shown, the liquid outlet hole 104 is disposed on the tube wall of the multi-lumen tube 11, and penetrates the tube wall to communicate with the liquid passage 103. In this embodiment, the axis of the liquid outlet hole 104 and the axis of the liquid passage 103 are perpendicular to each other.

[0039] Optionally, a plurality of liquid passages 103 are provided in the multi-lumen tube 11, and each liquid outlet area is provided with a plurality of liquid outlet holes 104, and each liquid outlet hole 104 is respectively connected to each liquid passage 103. Since a plurality of liquid passages 103 are provided in the multi-lumen tube 11, the filling and pressure relief time can be greatly reduced, and the blood flow blockage time is shortened.

[0040] Optionally, at least two liquid passages 103 are arranged opposite to each other along the radial direction of the multi-lumen tube 11. For example, two liquid passages 103 are arranged in the multi-lumen tube 11, and the two liquid passages 103 are arranged symmetrically along the radial direction of the multi-lumen tube 11, and the guide wire passage 102 is located between the two liquid passages 103, or four liquid passages 103 are arranged in the multi-lumen tube 11, two of which are arranged symmetrically along the radial direction of the multi-lumen tube 11, and the other two liquid passages 103 are arranged symmetrically along the radial direction of the multi-lumen tube 11, and the guide wire passage 102 is located between the four liquid passages 103. The number of liquid passages 103 can be freely designed according to actual needs, and is not limited thereto.

[0041] Optionally, the balloon 12 includes a first connecting section 121, a second connecting section 122 and an intermediate straight section 123, the first connecting section 121 and the second connecting section 122 are fixed to the multi-lumen tube 11 in an opposite arrangement, the intermediate straight section 123 is connected between the first connecting section 121 and the second connecting section 122, and the multiple liquid outlet areas on the multi-lumen tube 11 are only located in the area covered by the intermediate straight section 123. In this embodiment, the first connecting section 121 and the second connecting section 122 are trumpet-shaped, and the inner diameters of the first connecting section 121 and the second connecting section 122 gradually increase toward the direction close to the intermediate straight section 123, wherein the first developing ring 13 is correspondingly arranged below the connection between the first connecting section 121 and the intermediate straight section 123 (the shoulder of the balloon 12), and the second developing ring 14 is correspondingly arranged below the connection between the second connecting section 122 and the intermediate straight section 123 (the shoulder of the balloon 12).

[0042] Optionally, the first connecting section 121 and the second connecting section 122 are respectively matched with two heat shrink auxiliary materials and are hot-melt welded at 180° C. to 220° C.

[0043] Optionally, the inner diameter of the middle straight section 123 along the axial direction of the multi-lumen tube 11 is the same at all locations, the middle straight section 123 includes a first straight portion 1231, a second straight portion 1232 and a third straight portion 1233, the second straight portion 1232 is connected between the first straight portion 1231 and the third straight portion 1233, the first straight portion 1231 is connected to the first connecting section 121, the third straight portion 1233 is connected to the second connecting section 122, and the multiple liquid outlet areas on the multi-lumen tube 11 are only located in the area covered by the second straight portion 1232. Since the liquid outlet area corresponds to the middle part of the multi-lumen tube 11, when the balloon 12 is filled with the implant product, the contrast fluid first flows from the liquid outlet 104 to the middle part of the balloon 12. The pressure is low where the flow rate is high, so the pressure in the middle part of the balloon 12 is low and the pressure at both ends is high. When the instantaneous flow rate is large enough, the balloon 12 will expand from the middle part to both ends to position the implant and ensure accurate release.

[0044] Optionally, the length of the first straight portion 1231 is equal to the length of the third straight portion 1233 , and the length of the second straight portion 1232 is greater than or equal to the length of the first straight portion 1231 .

[0045] Optionally, the number of the liquid outlet areas is 3 to 50, for example, 4, 5, 6, 10, 15, 20, 30, or 40. In this embodiment, the plurality of liquid outlet areas are arranged at equal intervals along the axial direction of the multi-lumen tube 11, that is, the intervals between the two liquid outlet holes 104 of any two adjacent liquid outlet areas are equal.

[0046] Optionally, the number of liquid outlet holes 104 in each liquid outlet area corresponds to the number of liquid passages 103. For example, when two liquid passages 103 are provided in the multi-lumen tube 11, two liquid outlet holes 104 are provided in each liquid outlet area, and the two liquid outlet holes 104 are respectively connected to the two liquid passages 103; when three liquid passages 103 are provided in the multi-lumen tube 11, three liquid outlet holes 104 are provided in each liquid outlet area, and the three liquid outlet holes 104 are respectively connected to the three liquid passages 103; when four liquid passages 103 are provided in the multi-lumen tube 11, four liquid outlet holes 104 are provided in each liquid outlet area, and the four liquid outlet holes 104 are respectively connected to the four liquid passages 103.

[0047] Optionally, the inner diameter of the liquid outlet hole 104 is 0.1 mm to 1 mm, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.8 mm.

[0048] Optionally, a perforated membrane is used in conjunction with an electric drill to drill a liquid hole 104 on the multi-lumen tube 11. For example, the designed perforated membrane is covered directly above the liquid passage 103 of the multi-lumen tube 11, and an electric drill with a diameter range of 0.1 mm to 1 mm is used to drill into the wall of the multi-lumen tube 11 to a depth of 0.2 mm to 1 mm, thereby opening the liquid passage 103 without damaging the guide wire passage 102.

[0049] Optionally, the shape of the porous membrane is circular, triangular, or square, but is not limited thereto.

[0050] Optionally, the balloon dilatation catheter further includes a connector 15 and a stress diffusion tube 16, the connector 15 is connected to the proximal end of the multi-lumen tube 11, the connector 15 includes a wire interface 151 and a liquid inlet interface 152, the wire interface 151 is connected to the guidewire lumen 102, the liquid inlet interface 152 is connected to each liquid passage lumens 103, one end of the stress diffusion tube 16 is connected to the tube wall of the multi-lumen tube 11, and the other end of the stress diffusion tube 16 is connected to the connector 15. In this embodiment, the wire interface 151 is used for docking the guidewire, and the liquid inlet interface 152 is used for docking the filling pressure relief device.

[0051] Optionally, the connecting member 15 is made of a polymer material, such as PC, but not limited thereto.

[0052] Optionally, the stress diffusion tube 16 is made of a polymer material, such as silicone or polyurethane, but not limited thereto. The stress diffusion tube 16 functions to diffuse the stress near the connecting member 15 to avoid stress concentration.

[0053] Second embodiment

[0054] Figure 3 FIG. 2 is a partial cross-sectional structural diagram of a balloon dilatation catheter according to a second embodiment of the present application. Figure 3 As shown, the balloon dilatation catheter of this embodiment has substantially the same structure as the balloon dilatation catheter of the first embodiment, except that the liquid outlet hole 104 is disposed at a different position.

[0055] Alternatively, if Figure 3 As shown, the multiple liquid outlet areas on the multi-lumen tube 11 are located in the area covered by the first connecting section 121, the middle straight section 123 and the second connecting section 122. That is to say, the sections of the multi-lumen tube 11 located in the liquid-filled cavity 101 are all provided with liquid outlet areas, which is more than the number of liquid outlet areas provided only in the area covered by the second straight section 1232. The number of liquid outlet holes 104 is increased, thereby increasing the instantaneous flow rate.

[0056] Optionally, the number of the liquid outlet areas is 3 to 100, for example, 4, 6, 10, 15, 20, 30, 40, 60, 70, 90. In this embodiment, the plurality of liquid outlet areas are arranged at equal intervals along the axial direction of the multi-lumen tube 11, that is, the intervals between the two liquid outlet holes 104 of any two adjacent liquid outlet areas are equal.

[0057] Third embodiment

[0058] Figure 4 FIG. 1 is a partial cross-sectional structural diagram of a balloon dilatation catheter according to a third embodiment of the present application. Figure 4 As shown, the balloon dilatation catheter of this embodiment has substantially the same structure as the balloon dilatation catheter of the first embodiment or the second embodiment, except that a coating 17 is provided on the tube wall of the multi-lumen tube 11 located in the liquid-filled cavity 101 of this embodiment.

[0059] Alternatively, if Figure 4 As shown, the coating 17 covers all or part of the liquid outlet 104, and the coating 17 is soluble in a water-soluble liquid; the coating 17 can be disposed on the multi-lumen tube 11 by coating, and is cured by ultraviolet light to achieve blocking of the liquid outlet 104; when the coating 17 contacts the water-soluble liquid, it can dissolve quickly, for example, within 0.1 to 3 seconds. In this embodiment, the coating 17 is soluble in contrast solutions such as iopamidol and iopromide, for example: a water-soluble coating 17 such as polyvinyl alcohol, polyol, and water-soluble polyurethane.

[0060] Optionally, by controlling the thickness of the coating 17, the dissolution time of the coating 17 can be controlled; when the balloon 12 is filled, because the coating 17 covers the liquid outlet 104 to form a closed space, the contrast fluid will not flow into the balloon 12 instantly, but will first fill all the liquid passages 103 until the coating 17 dissolves, which takes about 0.1 to 3 seconds. After the coating 17 dissolves, the contrast fluid will be released instantly and simultaneously, so as to achieve the purpose of axially uniformly expanding the balloon 12, and give the doctor time to adjust the release position of the implant, so that the implant is accurately released and has strong operability.

[0061] It is worth mentioning that, in actual use, different hole solutions can be selected according to the length and diameter of the balloon 12. For example, for a balloon 12 with a middle straight section 123 length less than or equal to 60 mm and a diameter less than or equal to 12 mm, the balloon dilatation catheters of the first and second embodiments can be used preferentially, which are sufficient to ensure that the balloon 12 is uniformly expanded axially during the filling process and minimize the axial shortening of the stent. For example, for a balloon 12 with a middle straight section 123 length greater than 60 mm and a diameter greater than 12 mm, the balloon dilatation catheter of the third embodiment can be used.

[0062] The balloon dilatation catheter of the present application designs the direction and time of water outflow in disguise by punching liquid holes 104 or matching the liquid outlet holes 104 with the coating 17 at the specified position of the tube wall of the multi-lumen tube 11, so that the internal pressure of the balloon 12 tends to be consistent at the moment, and the dog-bone effect is reduced to the greatest extent, so that the balloon 12 can expand evenly. Moreover, by punching liquid holes 104 on the tube wall of the multi-lumen tube 11, the present application can enrich the filling points, increase the instantaneous flow rate, reduce the filling and pressure relief time, reduce the time of blood flow obstruction during surgery, and reduce the probability of surgical complications. In addition, the welding process used by the balloon dilatation catheter of the present application is simple and does not require complex and precise tooling, which saves costs and improves production efficiency.

[0063] Fourth embodiment

[0064] Figure 5 1 is a schematic diagram of the end structure of the multi-lumen tube of the fourth embodiment of the present application, Figure 6 Schematic diagram of the cross-sectional structure of the multi-lumen tube of the fourth embodiment of the present application. Figure 5 and Figure 6 As shown, the balloon dilatation catheter of this embodiment has substantially the same structure as the balloon dilatation catheter of the first embodiment, except that the local structure of the multi-lumen tube 11 is different.

[0065] Alternatively, if Figure 5 and Figure 6As shown, the end of the multi-lumen tube 11 includes a guide wire end face 112 and a plurality of liquid-passing end faces 113, the guide wire end face 112 is located outside the liquid-filling cavity 101, the guide wire cavity 102 passes through the guide wire end face 112, the plurality of liquid-passing end faces 113 are located in the liquid-filling cavity 101, the plurality of liquid-passing end faces 113 are arranged in a stepped manner along the axial direction of the multi-lumen tube 11, the multi-lumen tube 11 is provided with a plurality of liquid-passing cavities 103 extending to each liquid-passing end face 113, the liquid outlet hole 104 passes through the liquid-passing end face 113 and is connected to the liquid-passing cavities 103. Since the liquid outlet hole 104 of the present application is arranged at the liquid-passing end face 113, and the plurality of liquid-passing end faces 113 are arranged in a stepped manner along the axial direction of the multi-lumen tube 11, the section of the multi-lumen tube 11 located in the liquid-filling cavity 101 can discharge water at multiple points, thereby achieving the effect of uniform axial expansion of the balloon 12.

[0066] Optionally, the multiple liquid-passing end faces 113 include a first end face 1131 and a second end face 1132, the vertical distance between the second end face 1132 and the through-wire end face 112 is greater than the vertical distance between the first end face 1131 and the through-wire end face 112, the first end face 1131 is provided with at least one liquid outlet hole 104, and at least one liquid-passing cavity 103 extends to the first end face 1131, and the second end face 1132 is provided with at least one liquid outlet hole 104, and at least one liquid-passing cavity 103 extends to the second end face 1132. In this embodiment, four liquid passages 103 are provided in the multi-lumen tube 11, two of which extend to the first end surface 1131, and the first end surface 1131 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the other two liquid passages 103 extend to the second end surface 1132, and the second end surface 1132 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103.

[0067] Optionally, the multiple liquid-passing end faces 113 also include a third end face 1133, the vertical distance between the third end face 1133 and the through-wire end face 112 is greater than the vertical distance between the second end face 1132 and the through-wire end face 112, the third end face 1133 is provided with at least one liquid outlet hole 104, and at least one liquid-passing cavity 103 extends to the third end face 1133. In this embodiment, six liquid passages 103 are provided in the multi-lumen tube 11, wherein two liquid passages 103 extend to the first end surface 1131, and the first end surface 1131 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the two liquid passages 103 extend to the second end surface 1132, and the second end surface 1132 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the two liquid passages 103 extend to the third end surface 1133, and the third end surface 1133 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103.

[0068] Optionally, the multiple liquid-passing end faces 113 also include a fourth end face 1134, the vertical distance between the fourth end face 1134 and the through-wire end face 112 is greater than the vertical distance between the third end face 1133 and the through-wire end face 112, the fourth end face 1134 is provided with at least one liquid outlet hole 104, and at least one liquid-passing cavity 103 extends to the fourth end face 1134. In the present embodiment, eight liquid passages 103 are provided in the multi-lumen tube 11, wherein two liquid passages 103 extend to the first end surface 1131, and the first end surface 1131 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the two liquid passages 103 extend to the second end surface 1132, and the second end surface 1132 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the two liquid passages 103 extend to the third end surface 1133, and the third end surface 1133 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103; the two liquid passages 103 extend to the fourth end surface 1134, and the fourth end surface 1134 is provided with two liquid outlet holes 104 respectively connected to the two liquid passages 103.

[0069] Optionally, the length of the guidewire channel 102 is 1500 mm; the length of the liquid channel 103 extending to the first end face 1131 is 1365 mm; the length of the liquid channel 103 extending to the second end face 1132 is 1360 mm; the length of the liquid channel 103 extending to the third end face 1133 is 1355 mm; and the length of the liquid channel 103 extending to the fourth end face 1134 is 1350 mm. In this embodiment, the lengths of the guidewire channel 102 and the liquid channel 103 can be freely designed according to actual needs, and are not limited thereto.

[0070] Optionally, Figure 5 The multiple liquid passages 103 shown are arranged at equal or unequal intervals around the circumference of the guide wire lumen 102; the arrangement of the multiple liquid passages 103 is not limited to this, for example, the multiple liquid passages 103 are arranged in sequence along the radial direction of the multi-lumen tube 11, or the multiple liquid passages 103 are arranged irregularly, which can be freely selected according to actual needs.

[0071] It is worth mentioning that the number of the liquid-passing end surfaces 113 at the end of the multi-lumen tube 11 and the number of the liquid outlet holes 104 and the liquid-passing cavities 103 can be freely designed according to actual needs and are not limited to the above.

[0072] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present application. The various specific technical features described in the above specific embodiments can be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, the present application will not further explain various possible combinations.

Claims

1. A balloon dilatation catheter, characterized in that: The invention comprises a multi-lumen tube and a balloon, wherein the multi-lumen tube is provided with a guide wire cavity and at least one liquid passage cavity, the balloon is connected to the liquid outlet end of the multi-lumen tube, a liquid filling cavity is formed between the balloon and the multi-lumen tube, a section of the multi-lumen tube located in the liquid filling cavity is provided with a plurality of liquid outlet areas, the plurality of liquid outlet areas are arranged along the axial direction of the multi-lumen tube, each of the liquid outlet areas is provided with at least one liquid outlet hole, and the liquid outlet hole connects the liquid passage cavity with the liquid filling cavity; the balloon comprises a first connecting section, a second connecting section and an intermediate straight section, the first connecting section and the second connecting section are fixed to the multi-lumen tube in an opposite manner, the intermediate straight section is connected between the first connecting section and the second connecting section, and the intermediate straight section is provided at various locations along the axial direction of the multi-lumen tube The inner diameters are the same, the middle straight section includes a first straight portion, a second straight portion and a third straight portion, the second straight portion is connected between the first straight portion and the third straight portion, the first straight portion is connected to the first connecting section, the third straight portion is connected to the second connecting section, and the multiple liquid outlet areas on the multi-lumen tube are only located in the area covered by the second straight portion; a coating is provided on the tube wall of the multi-lumen tube located in the liquid-filled cavity, the coating covers all the liquid outlet holes, and the coating is soluble in a water-soluble liquid; when the balloon is filled, the water-soluble contrast fluid first fills all the liquid passages until the coating is dissolved, and after the coating is dissolved, the water-soluble contrast fluid will be instantly released simultaneously, so as to achieve axial uniform expansion of the balloon.

2. The balloon dilatation catheter according to claim 1, characterized in that: The liquid outlet hole is arranged on the tube wall of the multi-lumen tube, and penetrates through the tube wall to communicate with the liquid passage.

3. The balloon dilatation catheter according to claim 2, characterized in that: A plurality of liquid passages are arranged in the multi-lumen tube, and each of the liquid outlet areas is provided with a plurality of liquid outlet holes, each of the liquid outlet holes is communicated with each of the liquid passages respectively.

4. The balloon dilatation catheter according to claim 3, characterized in that: At least two of the liquid passages are arranged opposite to each other along the radial direction of the multi-lumen tube.

5. The balloon dilatation catheter according to any one of claims 2 to 4, characterized in that: The number of the liquid outlet areas is 3 to 100.

6. The balloon dilatation catheter according to any one of claims 2 to 4, characterized in that: The inner diameter of the liquid outlet hole is 0.1 mm to 1 mm.

7. The balloon dilatation catheter according to claim 1, characterized in that: The end of the multi-lumen tube includes a guide wire end face and multiple liquid-passing end faces, the guide wire end face is located outside the liquid-filling cavity, the guide wire cavity passes through the guide wire end face, the multiple liquid-passing end faces are located in the liquid-filling cavity, the multiple liquid-passing end faces are arranged in a stepped manner along the axial direction of the multi-lumen tube, the multi-lumen tube is provided with multiple liquid-passing cavities extending to each of the liquid-passing end faces, the liquid outlet passes through the liquid-passing end face and is connected to the liquid-passing cavity.

8. The balloon dilatation catheter according to claim 7, characterized in that: The multiple liquid-passing end faces include a first end face and a second end face, the vertical distance of the second end face compared to the through-wire end face is greater than the vertical distance of the first end face compared to the through-wire end face, the first end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the first end face, and the second end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the second end face.

9. The balloon dilatation catheter according to claim 8, characterized in that: The balloon dilatation catheter comprises at least one of the following: The plurality of liquid-passing end faces further include a third end face, the vertical distance between the third end face and the through-wire end face is greater than the vertical distance between the second end face and the through-wire end face, the third end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the third end face; The multiple liquid-passing end faces also include a fourth end face, the vertical distance between the fourth end face and the through-wire end face is greater than the vertical distance between the third end face and the through-wire end face, the fourth end face is provided with at least one liquid outlet hole, and at least one liquid-passing cavity extends to the fourth end face.

10. The balloon dilatation catheter according to claim 1, characterized in that: The balloon dilatation catheter also includes a connector and a stress diffusion tube, wherein the connector is connected to the proximal end of the multi-lumen tube, the connector includes a guide wire interface and a liquid inlet interface, the guide wire interface is connected to the guide wire cavity, the liquid inlet interface is connected to each of the liquid cavities, one end of the stress diffusion tube is connected to the tube wall of the multi-lumen tube, and the other end of the stress diffusion tube is connected to the connector.

11. The balloon dilatation catheter according to claim 1, characterized in that: The balloon dilatation catheter further includes a first developing ring and a second developing ring, wherein the first developing ring and the second developing ring are located in the liquid-filled cavity and fixed on the multi-lumen tube.

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