Balloon catheter

Abstract

The utility model relates to the field of interventional medical instruments, and discloses a balloon catheter which comprises a catheter seat, an inner pipe fitting, an outer sleeve and a balloon, and a guide wire cavity and a balloon filling cavity are formed in the inner pipe fitting; pins at the two ends of the balloon are fixed to the inner pipe fitting in a sealed mode, so that a balloon body part of the balloon forms a closed balloon cavity on the outer side of the inner pipe fitting, and the balloon cavity communicates with the balloon filling cavity; the far end of the outer sleeve is retracted in front of the balloon body part and is hermetically fixed on the outer side of the inner pipe fitting and / or a pipe pin at the near end of the balloon, a perfusion cavity is formed between the outer sleeve and the inner pipe fitting, and a perfusion hole for communicating the perfusion cavity to the outside is formed in the outer sleeve; the near ends of the inner pipe fitting and the outer sleeve are both fixed to the catheter base, and the guide wire cavity, the balloon filling cavity and the perfusion cavity are communicated with a guide wire inlet, a balloon filling opening and a perfusion opening of the catheter base respectively. The perfusion cavity and the guide wire cavity are independently arranged, so that contrast agent infusion can be carried out without withdrawing the guide wire in an operation, and the operation time is short.

Description

Technical Field

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

[0002] Balloon catheter is a commonly used interventional device in interventional surgery. Its basic structure is to equip a balloon that can be inflated and expanded on a catheter. In this way, during the interventional surgery, the balloon is guided by the guide wire to the lesion site with the catheter, and the expansion medium is introduced into the balloon through the specific lumen in the catheter to inflate the balloon to a preset degree, thereby fully expanding the lesion site of the blood vessel to achieve the effect of improving the local stenosis of the blood vessel.

[0003] During interventional surgery, after the balloon catheter is in place and the diseased blood vessels are dilated, angiography is required to confirm the effect of the dilation at the lesion site. The conventional practice is to withdraw the balloon catheter and then reinsert a guide catheter for angiography. This method will increase the number of exchanges and operation steps during the operation and prolong the operation time.

[0004] To solve this problem, some structures for realizing contrast agent infusion on balloon catheters are also disclosed in the related prior art. In this type of improved balloon catheter, in order to avoid the mutual influence between the contrast agent and the fluid medium filling the balloon, the guidewire cavity is often chosen to serve as the contrast agent infusion cavity. The guidewire itself will occupy a certain amount of lumen space, which means that the infusion speed of the contrast agent is greatly limited. Usually, since the location of the balloon catheter intervention is a blood vessel, there is flowing blood inside it, and low-speed infusion of contrast agent may result in poor contrast effect or even failure due to blood dilution. Therefore, this type of balloon catheter often needs to withdraw the guidewire before infusing the contrast agent to ensure that the space in the lumen meets the flow rate requirements for contrast agent infusion.

[0005] It can be seen that although the improved balloon catheter structure avoids the need for overall withdrawal, the guidewire still needs to be withdrawn. Therefore, there is still the problem of prolonged operation time due to intraoperative exchange. Utility Model Content

[0006] The present application provides a balloon catheter in which the perfusion cavity and the guidewire cavity are independent of each other, and contrast agent infusion can be performed without withdrawing the guidewire during the operation, thereby shortening the operation time.

[0007] To achieve the above-mentioned purpose, the present application provides a balloon catheter, which includes a catheter seat, an inner tube, an outer sleeve sleeved outside the inner tube, and a balloon, wherein: the inner tube is provided with a guidewire cavity for accommodating the passage of a guidewire, and a balloon filling cavity for accommodating the flow of an expansion medium; the pins at both ends of the balloon are sealed and fixed to the inner tube, so that the balloon body part of the balloon forms a closed balloon chamber on the outside of the inner tube, and the balloon chamber is connected to the balloon filling cavity. cavity; the distal end of the outer sleeve is stopped in front of the balloon body part and is sealed and fixed to the outer side of the pin of the inner tube and / or the proximal end of the balloon, a perfusion cavity is formed between the outer sleeve and the inner tube, and a perfusion hole connecting the perfusion cavity to the outside is opened on the outer sleeve; the proximal ends of the inner tube and the outer sleeve are fixed to the catheter seat, and the guidewire cavity, the balloon filling cavity and the perfusion cavity are respectively connected to the guidewire inlet, the balloon filling port and the perfusion port of the catheter seat.

[0008] According to some embodiments of the present application, the outer sleeve includes a first pipe segment and a second pipe segment that are fixed to each other or integrally arranged, the hardness of the second pipe segment is greater than the hardness of the first pipe segment, and the perfusion hole is opened on the second pipe segment.

[0009] According to some embodiments of the present application, the first pipe segment and the second pipe segment are integrally arranged, and the wall thickness of the second pipe segment is greater than the wall thickness of the first pipe segment, so that the hardness of the second pipe segment is greater than the hardness of the first pipe segment, or the first pipe segment and the second pipe segment are separately arranged and fixed to each other, and the pipe hardness of the second pipe segment is greater than the pipe hardness of the first pipe segment.

[0010] According to some embodiments of the present application, the distance between the pin at the proximal end of the balloon and the sealing connection portion of the inner tube and the perfusion hole is set to 1mm-5mm.

[0011] According to some embodiments of the present application, the inner tube fitting includes a double-lumen inner tube segment and a single-lumen inner tube segment that are fixed to each other, and the distal end of the double-lumen inner tube segment and the proximal end of the single-lumen inner tube segment are fixed to each other; the two lumens of the double-lumen inner tube segment serve as a part of the guidewire lumen and the balloon filling lumen, respectively, and the lumen of the single-lumen inner tube segment is sealed and connected to the lumen of the double-lumen inner tube segment that serves as a part of the guidewire lumen, so as to form an axially through guidewire lumen in the inner tube fitting.

[0012] According to some embodiments of the present application, the balloon is sleeved outside the single-lumen tube segment; the balloon catheter also includes two developing rings that are pressed and fixed to the outer circumference of the single-lumen tube segment.

[0013] According to some embodiments of the present application, the catheter seat includes a main seat body and a first support body and a second support body arranged on the outer peripheral side of the main seat body, wherein: the main seat body is provided with a main channel that penetrates the main seat body axially, the inner tube and the proximal ends of the outer sleeve are inserted from the distal end of the main channel and are stopped and fixed at different positions in the main channel, and the proximal end of the main channel is set as the guide wire entrance; the first support body and the second support body are respectively provided with a first branch channel and a second branch channel that penetrate the first support body and the second support body; one end opening of the first branch channel is connected to the main channel, and the other end opening is set as the perfusion port; and one end opening of the second branch channel is connected to the main channel, and the other end opening is set as the balloon filling port.

[0014] According to some embodiments of the present application, the first support body and the second support body are arranged at different positions of the main support body with axial and circumferential intervals.

[0015] According to some embodiments of the present application, a first glue injection hole, a second glue injection hole and a third glue injection hole are provided on the main seat body, which are connected to the main channel from the outside; the first glue injection hole is provided at a position between the first support body and the distal end of the main seat body, and the outer sleeve is stopped at a position between the first support body and the first glue injection hole; the second glue injection hole is provided at a position between the first support body and the second support body, and the double-lumen inner tube section is stopped at a position between the second support body and the second glue injection hole; the inner tube also includes a connecting inner tube section, the distal end of the connecting inner tube section is fixed to the proximal end of the double-lumen inner tube section, and the tube cavity of the connecting inner tube section is connected to the guide wire cavity; the third glue injection hole is provided at a position between the second support body and the proximal end of the main seat body, and the proximal end of the connecting inner tube section is stopped at a position between the third glue injection hole and the guide wire entrance.

[0016] According to some embodiments of the present application, the balloon catheter also includes a catheter reinforcement tube, which is sleeved on the outside of the outer sleeve, and its distal end is heat-shrunk or adhesively fixed to the outer peripheral wall of the outer sleeve, and its proximal end is fixed to the main seat body.

[0017] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0018] A guidewire cavity and a balloon filling cavity are formed in the inner tube, and a perfusion cavity is formed between the outer sleeve and the inner tube, so that the three chambers in the balloon catheter are independent of each other and there is no sharing. Therefore, the contrast agent can enter the perfusion cavity through the perfusion port on the catheter seat, and finally output to the preset position through the perfusion hole. Before the infusion operation, there is no need to withdraw the balloon catheter as a whole or the guidewire, so the operation time is significantly shortened. At the same time, the perfusion cavity is arranged in the annular area between the outer sleeve and the inner tube, so under the same diameter conditions, a larger perfusion cavity area can be obtained, thereby meeting the requirement that the contrast agent quickly flows into the designated position in the blood vessel. In addition, since the balloon remains in the original expansion position during the contrast agent infusion, and the position of the perfusion hole relative to the balloon is predetermined, the current position of the balloon can be used as a reference when the contrast agent is infused, so that the contrast agent can be more accurately infused to the designated position that needs to be confirmed by angiography, which is conducive to accurate infusion operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a balloon catheter according to an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A cross-sectional view of a balloon catheter is shown in;

[0021] Figure 3 yes Figure 1 A cross-sectional view of the balloon catheter at the location of the perfusion hole shown in FIG, showing the cross-section of the outer sleeve and the double-lumen inner tube section;

[0022] Figure 4 for Figure 2 An enlarged view of part A of the cross-sectional view shown in , showing the connection and matching relationship between the inner pipe fitting, the outer sleeve and the catheter reinforcement tube and the catheter seat;

[0023] Figure 5 for Figure 2 An enlarged view of part B of the cross-sectional view shown in , showing the connection and matching relationship between the double-lumen inner tube section, the single-lumen inner tube section and the balloon of the inner tube;

[0024] Figure 6 This is a schematic diagram of the structure of a catheter seat according to an embodiment of the present application. In the figure, three dotted lines are used to mark the stop positions of the outer sleeve, the double-lumen inner tube section and the connecting inner tube section in the main seat body.

[0025] Reference numerals: 100, catheter seat; 11, main seat body; 111, main channel; 112, guide wire entrance; 113, first glue injection hole; 114, second glue injection hole; 115, third glue injection hole; 12, first support seat body; 121, first branch channel; 122, perfusion port; 13, second support seat body; 131, second branch channel; 132, balloon filling port;

[0026] 200, inner tube; 21, double-lumen inner tube section; 211, balloon filling cavity; 22, single-lumen inner tube section; 23, guidewire cavity; 24, connecting inner tube section;

[0027] 300, outer sleeve; 31, first pipe section; 32, second pipe section; 321, perfusion hole; 33, perfusion cavity;

[0028] 400, balloon; 41, balloon body; 411, balloon chamber; 500, catheter reinforcement tube; 600, developing ring. DETAILED DESCRIPTION

[0029] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The methods described in the following exemplary embodiments do not represent all methods consistent with the present application, but are only preferred embodiments of the present application. Those skilled in the art can make some changes or modify them into equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

[0030] In addition, in the description of this application, the proximal end and the distal end are defined with reference to the position of the operator when the balloon catheter is used, that is, the distal end refers to the end of the instrument or component itself that is relatively far from the operator, and the proximal end refers to the end of the instrument or component itself that is relatively close to the operator. Figure 3 All the drawings except for FIG. 1 and FIG. 2 are based on the left end side as the proximal end and the right end side as the distal end. The embodiments of the present application will be described in detail below in conjunction with the drawings.

[0031] like Figure 1 As shown in , a balloon catheter according to an embodiment of the present application includes a catheter seat 100 , an inner tube 200 , an outer tube 300 and a balloon 400 .

[0032] exist Figure 1 Based on the combination Figure 3 As shown in the figure, the inner tube 200 is provided with a guidewire cavity 23 for allowing a guidewire to pass through, and a balloon filling cavity 211 for allowing an expansion medium to flow through. The outer tube 300 is sleeved on the outer side of the inner tube 200, and a perfusion cavity 33 is formed between the inner tube wall of the outer tube 300 and the outer tube wall of the corresponding tube section of the inner tube 200, and the perfusion cavity 33 is used to allow a contrast agent to flow in.

[0033] refer to Figure 2 and Figure 5As shown in the figure, the pins at both ends of the balloon 400 are sealed and fixed on the inner tube 200, so that the body 41 of the balloon 400 can form a closed balloon chamber 411 outside the inner tube 200. After the expansion medium flowing into the balloon filling cavity 211 enters the balloon chamber 411, the body 41 of the balloon 400 expands to a preset degree, thereby achieving expansion of the lesion position of the blood vessel.

[0034] Continue to refer Figure 2 and Figure 5 As shown in the figure, the distal end of the outer sleeve 300 is stopped before the balloon 400 and is sealed and fixed to the outer side of the proximal pin of the inner tube 200 and / or the balloon 400, so that the distal end of the perfusion cavity 33 is closed and the proximal end is connected to the perfusion port 122 on the catheter adapter 100 described below. The outer sleeve 300 is provided with a perfusion hole 321 connecting the perfusion cavity 33 to the outside.

[0035] The sealing and fixing between the distal end of the outer tube 300 and the tube pins at the proximal end of the inner tube 200 or the balloon 400 usually needs to be achieved by welding. Therefore, by selecting the inner tube 200 as the sealing and fixing position of the distal end of the outer tube 300, the proximal tube pins of the balloon 400 can be prevented from being affected by the welding heat, thereby preventing the sealing of the balloon 400 from being damaged due to the connection relationship. It can be understood that when the distal end of the outer tube 300 is sealed and fixed by a method other than welding, the tube pins fixed to the proximal end of the inner tube 200 or the balloon 400 will not have the above-mentioned difference.

[0036] The guidewire inlet 112, the perfusion port 122 and the balloon filling port 132 are provided at different positions on the catheter seat 100, and the three ports are respectively connected to the aforementioned guidewire cavity 23, the perfusion cavity 33 and the balloon filling cavity 211. In this way, the guidewire passes through the guidewire inlet 112 into the balloon catheter, and finally passes through the distal end of the inner tube 200; the expansion medium used to fill the balloon 400 flows into the balloon filling cavity 211 from the balloon filling port 132, and finally enters the balloon chamber 411 in the balloon body 41; the contrast agent flows into the perfusion cavity 33 from the perfusion port 122, and finally flows out through the perfusion hole 321 to the position in front of the balloon 400, so as to achieve contrast in the blood vessel relatively close to the balloon 400, so that the operator can confirm the effect of the expansion of the diseased blood vessel where the balloon 400 is located through the image.

[0037] Since the perfusion cavity 33 is formed between the inner tube 200 and the outer tube 300, and is independent of the guidewire cavity 23 in the inner tube 200, after the balloon catheter is inserted into place to complete the expansion of the diseased blood vessel, neither the balloon catheter itself nor the guidewire in the guidewire cavity 23 needs to be withdrawn, but the contrast agent can be directly injected into the blood vessel at a suitable speed through the perfusion cavity 33 and the perfusion hole 321. This method avoids the exchange action of extracting the guidewire or withdrawing the balloon catheter as a whole and replacing the guide catheter during the operation, so the overall time of the interventional surgery is shorter.

[0038] like Figure 5 As shown in , the inner tube 200 may include a double-lumen inner tube section 21 and a single-lumen inner tube section 22 fixed to each other, and the proximal end of the single-lumen inner tube section 22 is fixedly connected to the distal end of the double-lumen inner tube section 21. Figure 5 Based on the combination Figure 3 As shown in the figure, two independent lumens are provided in the double-lumen inner tube segment 21, and the two lumens serve as a part of the guidewire lumen 23 and the balloon filling lumen 211 respectively; there is only one lumen in the single-lumen inner tube segment 22, and in the connected state, the lumen of the single-lumen inner tube segment 22 is sealed and connected with the lumen of the double-lumen inner tube segment 21 serving as the guidewire lumen 23, so that the lumens in the two tube segments together form the guidewire lumen 23 that runs through the proximal and distal ends of the inner tube member 200.

[0039] The balloon 400 is sleeved outside the single-lumen tube section 22, and two developing rings 600 are fixed to the outer periphery of the single-lumen tube section 22 located in the balloon chamber 411. The spacing between the two developing rings 600 can be arranged at intervals according to the effective length of the balloon 400.

[0040] As mentioned above, when contrast agent is injected, the balloon catheter does not need to be withdrawn or moved, and the position of the developing ring 600 and the position of the perfusion hole 321 from the two developing rings 600 can be confirmed before the balloon catheter intervenes in the blood vessel. Therefore, when injecting contrast agent in this state, the operator can use the developing ring 600 as a reference. Compared with the contrast agent injection scheme of withdrawing the balloon catheter as a whole and reinserting it into the guide catheter, the scheme in the present application can inject the contrast agent to the predetermined position more accurately.

[0041] In addition, since the developing ring 600 usually needs to be fixed by pressing and gripping, and the outer peripheral shape of the double-lumen inner tube segment 21 is usually difficult to ensure to be a regular rotation surface, directly pressing and gripping the developing ring 600 on the outside of the double-lumen inner tube segment 21 is likely to cause the developing ring 600 to break and break during the pressing and gripping process. Compared with the double-lumen inner tube segment 21, the single-lumen inner tube segment 22 itself has only one lumen, and its outer peripheral shape is easier to ensure to be a regular rotation surface. Therefore, in the above embodiment of the present application, pressing and gripping the developing ring 600 on the outside of the single-lumen inner tube segment 22 can reduce the probability of the developing ring 600 breaking and breaking during the pressing and gripping process.

[0042] At the same time, since the double-lumen inner pipe segment 21 has a more complex lumen, its cost is higher than that of the single-lumen inner pipe segment 22. Therefore, a two-section structure of the inner pipe fitting 200 is adopted. By replacing one section of the inner pipe fitting 200 with a lower-cost single-lumen inner pipe segment 22, the overall cost of the inner pipe fitting 200 can be reduced.

[0043] exist Figure 2 Based on the combination Figure 4 and Figure 5 As shown in , since the perfusion hole 321 needs to be opened on the outer sleeve 300, the operation of opening the hole will inevitably cause the local mechanical properties of the outer sleeve 300 to decrease. Therefore, the outer sleeve 300 and even the local position of the balloon catheter are prone to undesirable bending. In order to avoid the occurrence of this problem, in one embodiment of the present application, the outer sleeve 300 includes a first pipe segment 31 and a second pipe segment 32 fixed to each other or integrally arranged, wherein the hardness of the second pipe segment 32 is greater than the hardness of the first pipe segment 31, and the perfusion hole 321 is opened on the second pipe segment 32. In this way, by improving the local hardness of the outer sleeve 300, the influence of the opening of the perfusion hole 321 on the local mechanical properties of the outer sleeve 300 is offset or at least weakened.

[0044] It is understandable that the outer sleeve 300 is divided into the first pipe section 31 and the second pipe section 32 here, which does not necessarily mean that the outer sleeve 300 has two obvious independent pipe sections that can be divided from the appearance.

[0045] In one embodiment, the first pipe section 31 and the second pipe section 32 are integrally provided, and the wall of the second pipe section 32 is thickened so that the hardness of the second pipe section 32 is greater than that of the first pipe section 31. In this embodiment, there may be no obvious boundary between the two pipe sections, and only targeted local treatment is performed during the forming of the pipe material to ensure that a pipe section with a slightly thicker thickness is used as the second pipe section 32.

[0046] The first pipe section 31 and the second pipe section 32 may also be two sections of pipe material fixed to each other, and the second pipe section 32 is made of a harder material, so as to ensure that the hardness of the second pipe section 32 is greater than the hardness of the first pipe section 31. It can be understood that whether the pipe wall is thickened or the second pipe section 32 is made of a harder material, the purpose is to harden the local pipe section (i.e., the vicinity of the location where the injection hole 321 is opened) of the outer sleeve 300. Therefore, according to actual needs, the two means can also be organically combined, that is, the second pipe section 32 is not only made of a harder material, but also has a larger pipe wall thickness than the first pipe section 31.

[0047] Furthermore, in order to prevent the opening of the perfusion hole 321 from affecting the sealing of the balloon 400, and at the same time prevent the perfusion hole 321 from being too far away from the balloon 400 and affecting the angiography effect, the distance between the position of the perfusion hole 321 and the sealing connection between the proximal pin of the balloon 400 and the inner tube 200 is set to 1mm-5mm.

[0048] exist Figure 4 Based on the combination Figure 6 As shown in , the catheter seat 100 includes a main seat body 11 and a first support seat body 12 and a second support seat body 13 disposed on the outer peripheral side of the main seat body 11, wherein: a main channel 111 is provided on the main seat body 11 and is axially penetrated. A first branch channel 121 and a second branch channel 131 are provided on the first support seat body 12 and the second support seat body 13, respectively, and one end opening of the first branch channel 121 and the second branch channel 131 are both connected to the main channel 111, and the other end openings of the two branch channels are used as a perfusion port 122 and a balloon filling port 132, respectively.

[0049] The first support body 12 and the second support body 13 are arranged at different positions of the main support body 11 at intervals in the axial direction and the circumferential direction. In the illustrated embodiment, the first support body 12 and the second support body 13 are arranged at intervals of about 180 degrees in the circumferential direction.

[0050] Combination Figure 2 and Figure 4 As shown in the figure, the balloon catheter also includes a catheter reinforcement tube 500, which is sleeved on the outer side of the outer sleeve 300, and its distal end is fixed to the outer peripheral wall of the outer sleeve 300 by heat shrinkage or bonding. The proximal end of the catheter reinforcement tube 500 is fixed to the main seat body 11. The provision of the catheter reinforcement tube 500 can reduce the stress concentration between the inner and outer tubes and the catheter seat 100, and prevent the inner and outer catheters from bending during packaging and use. In addition, the catheter reinforcement tube 500 can be made of a material with good biocompatibility, such as polyolefin.

[0051] The inner tube 200 also includes a connecting inner tube section 24, the distal end of which is fixedly connected to the proximal end of the double-lumen inner tube section 21, and the inner lumen thereof is connected to the guidewire lumen 23, thereby connecting the guidewire inlet 112, the main channel 111 and the guidewire lumen 23 to ensure smooth passage of the guidewire.

[0052] like Figure 6 As shown in the figure, in order to achieve the fixation of the connecting inner tube section 24, the double-lumen inner tube section 21 and the outer sleeve 300 in the catheter seat 100, the main seat body 11 is also provided with a first glue injection hole 113, a second glue injection hole 114 and a third glue injection hole 115 which are connected to the outside of the main seat body 11 and are connected to the main channel 111.

[0053] The first injection hole 113 is formed between the first support body 12 and the distal end of the main support body 11, and the outer sleeve 300 is closed between the first support body 12 and the first injection hole 113, that is, Figure 6 The dotted line position marked I in the middle, so that glue is injected inward through the first glue injection hole 113, and the outer sleeve 300 can be bonded and fixed to the dotted line position marked I in the main channel 111.

[0054] Similarly, the second injection hole 114 is opened between the first support body 12 and the second support body 13, and the proximal end of the double-lumen inner tube section 21 is stopped at the position between the second support body 13 and the second injection hole 114, that is, Figure 6 The dotted line position marked II in the middle, by injecting glue inward through the second glue injection hole 114, the double-lumen inner tube section 21 can be bonded and fixed to the dotted line position marked II in the main channel 111.

[0055] The third injection hole 115 is opened between the second support body 13 and the proximal end of the main support body 11, and the proximal end of the inner tube section 24 is closed at the position between the third injection hole 115 and the guide wire inlet 112, that is, Figure 6 The dotted line position marked III in the middle, so that glue is injected inward through the third glue injection hole 115, and the connecting inner pipe section can be bonded and fixed to the dotted line position marked III in the main channel 111.

Claims

1. A balloon catheter, characterized in that: The balloon catheter comprises a catheter seat (100), an inner tube (200), an outer sleeve (300) sleeved outside the inner tube (200), and a balloon (400), wherein: The inner tube (200) is provided with a guidewire cavity (23) for allowing a guidewire to pass through, and a balloon filling cavity (211) for allowing an expansion medium to flow through; The pins at both ends of the balloon (400) are sealed and fixed to the inner tube (200), so that the balloon body (41) of the balloon (400) forms a closed balloon chamber (411) outside the inner tube (200), and the balloon chamber (411) is connected to the balloon filling cavity (211); The distal end of the outer sleeve (300) is stopped before the balloon body (41) and is sealed and fixed to the outer side of the proximal pin of the inner tube (200) and / or the balloon (400), and a perfusion cavity (33) is formed between the outer sleeve (300) and the inner tube (200). The outer sleeve (300) is provided with a perfusion hole (321) connecting the perfusion cavity (33) to the outside. The proximal ends of the inner tube (200) and the outer tube (300) are fixed to the catheter seat (100), and the guidewire cavity (23), the balloon filling cavity (211) and the perfusion cavity (33) are respectively connected to the guidewire inlet (112), the balloon filling port (132) and the perfusion port (122) of the catheter seat (100).

2. The balloon catheter according to claim 1, characterized in that: The outer sleeve (300) comprises a first pipe section (31) and a second pipe section (32) which are fixed to each other or integrally arranged, the hardness of the second pipe section (32) is greater than the hardness of the first pipe section (31), and the perfusion hole (321) is opened on the second pipe section (32).

3. The balloon catheter according to claim 2, characterized in that: The first pipe section (31) and the second pipe section (32) are integrally arranged, and the wall thickness of the second pipe section (32) is greater than the wall thickness of the first pipe section (31), so that the hardness of the second pipe section (32) is greater than the hardness of the first pipe section (31), or, The first pipe section (31) and the second pipe section (32) are separately arranged and fixed to each other, and the pipe material hardness of the second pipe section (32) is greater than the pipe material hardness of the first pipe section (31).

4. The balloon catheter according to claim 1, characterized in that: The distance between the tube pin at the proximal end of the balloon (400) and the sealed connection portion of the inner tube (200) and the perfusion hole (321) is set to 1 mm-5 mm.

5. The balloon catheter according to claim 1, characterized in that: The inner tube member (200) comprises a double-lumen inner tube segment (21) and a single-lumen inner tube segment (22) fixed to each other, and the distal end of the double-lumen inner tube segment (21) and the proximal end of the single-lumen inner tube segment (22) are fixed to each other; The two lumens of the double-lumen inner tube segment (21) serve as a part of the guidewire lumen (23) and the balloon filling lumen (211), respectively, and the lumen of the single-lumen inner tube segment (22) is sealed and connected to the lumen of the double-lumen inner tube segment (21) serving as a part of the guidewire lumen (23), so as to form an axially through guidewire lumen (23) in the inner tube member (200).

6. The balloon catheter according to claim 5, characterized in that: The balloon (400) is sleeved outside the single-lumen tube section (22); the balloon catheter also includes two developing rings (600) that are pressed and fixed to the outer circumference of the single-lumen tube section (22).

7. The balloon catheter according to claim 5, characterized in that: The catheter seat (100) comprises a main seat body (11) and a first support seat body (12) and a second support seat body (13) arranged on the outer peripheral side of the main seat body (11), wherein: The main seat body (11) is provided with a main channel (111) which penetrates the main seat body (11) in the axial direction. The proximal ends of the inner tube (200) and the outer sleeve (300) are inserted from the distal end of the main channel (111) and are fixed at different positions in the main channel (111). The proximal end of the main channel (111) is set as the guide wire inlet (112). The first support body (12) and the second support body (13) are respectively provided with a first branch hole (121) and a second branch hole (131) penetrating the first support body (12) and the second support body (13); One end opening of the first branch channel (121) is connected to the main channel (111), and the other end opening is configured as the injection port (122); and, One end opening of the second branch channel (131) is connected to the main channel (111), and the other end opening is configured as the balloon filling port (132).

8. The balloon catheter according to claim 7, characterized in that: The first support body (12) and the second support body (13) are arranged at different positions of the main support body (11) at intervals in the axial direction and the circumferential direction.

9. The balloon catheter according to claim 8, characterized in that: The main seat body (11) is provided with a first glue injection hole (113), a second glue injection hole (114) and a third glue injection hole (115) which are connected from the outside to the main channel (111); The first glue injection hole (113) is opened at a position between the first support body (12) and the distal end of the main support body (11), and the outer sleeve (300) is stopped at a position between the first support body (12) and the first glue injection hole (113); The second glue injection hole (114) is opened at a position between the first support body (12) and the second support body (13), and the double-lumen inner tube section (21) is stopped at a position between the second support body (13) and the second glue injection hole (114); The inner tube member (200) further comprises a connecting inner tube segment (24), the distal end of the connecting inner tube segment (24) being fixed to the proximal end of the double-lumen inner tube segment (21), and the lumen of the connecting inner tube segment (24) being connected to the guidewire lumen (23); The third glue injection hole (115) is opened at a position between the second support body (13) and the proximal end of the main support body (11), and the proximal end of the connecting inner tube section (24) is terminated at a position between the third glue injection hole (115) and the guide wire inlet (112).

10. The balloon catheter according to claim 7, characterized in that: The balloon catheter also includes a catheter reinforcement tube (500), which is sleeved on the outside of the outer sleeve (300), and its distal end is heat-shrunk or adhesively fixed to the outer wall of the outer sleeve (300), and its proximal end is fixed to the main seat body (11).

Images