Double-balloon coronary artery thrombus suction catheter

Abstract

The invention relates to the technical field of medical instruments, and discloses a double-balloon coronary artery thrombus aspiration catheter, according to the scheme, an aspiration cannula is movably arranged in the aspiration catheter in a penetrating mode, and a connecting piece and a guiding piece which are arranged in an umbrella shape are arranged at the front end of the aspiration cannula. Meanwhile, the aspiration cannula is conveyed forwards and rotated, thrombus blocks with large sizes are mashed, the thrombus aspiration efficiency can be improved, a certain guiding effect is achieved through the guiding piece in the process that the aspiration catheter moves along the blood vessel, the end of the aspiration cannula is prevented from making direct contact with the inner wall of the blood vessel, and the thrombus aspiration efficiency is improved. Damage to the blood vessel wall in the suction catheter moving process is avoided; meanwhile, the space where the thrombus is located is blocked through the first balloon and the second balloon which are arranged in a front-back spaced mode, overflowing of the thrombus in the aspiration process is avoided, flushing fluid or medicine can be injected along the aspiration catheter, the aspiration efficiency and the aspiration effect of the thrombus are effectively improved, and operation safety and effectiveness are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a double-balloon coronary thrombus aspiration catheter. Background Art

[0002] At present, some coronary thrombus aspiration catheter products on the market have some defects and limitations. On the one hand, the existing thrombus aspiration catheters are prone to cause thrombi to spread proximally and distally and overflow the aspiration interval during the thrombus aspiration operation, thereby causing embolism in other parts of the blood vessels or causing stroke. In addition, residual thrombi and inflammatory mediators are prone to cause slow blood flow and no reflow, affecting the prognosis. On the other hand, the thrombus aspiration catheter cannot break up large thrombi, resulting in excessive thrombi causing blockage of the distal part of the aspiration catheter during the aspiration process, which is not conducive to the aspiration of thrombi and requires them to be removed from the blood vessels for cleaning, which prolongs the operation time, increases the risk of surgery, and reduces the efficiency of the treatment of acute myocardial infarction. Summary of the invention

[0003] The purpose of the present invention is to provide a double-balloon coronary thrombus aspiration catheter to solve the problem that the thrombus aspiration catheter in the prior art easily causes the thrombus to spread in the distal part during the aspiration process and is unable to break up large thrombi.

[0004] In order to achieve the above-mentioned purpose, the present application provides a double-balloon coronary thrombus aspiration catheter, comprising:

[0005] A suction conduit, wherein a suction channel is provided along the length of the suction conduit, and the suction conduit has a front end and a rear end that are arranged opposite to each other;

[0006] A suction sleeve, which can be movably inserted into the suction channel and has two ends extending out of the front end and the rear end respectively, and one end of the suction sleeve extending out of the front end is provided with a crushing component for crushing thrombus;

[0007] An extension piece connected to the end surface of the tube wall of the suction tube at the front end, the extension piece is arranged along the length extension direction of the suction tube; the extension piece and the suction tube form a suction tube rack;

[0008] A first balloon is disposed on a side of the suction catheter close to the front end and is sleeved on the outer peripheral wall of the suction catheter along the circumference of the suction catheter;

[0009] A second balloon is disposed on a side of the extension member away from the front end and sleeved on an outer peripheral wall of the extension member along the circumferential direction of the extension member, and the crushing assembly is located between the first balloon and the second balloon;

[0010] An air supply channel is provided in the tube wall of the suction tube holder and is connected to the first balloon and the second balloon respectively;

[0011] a metal marker band, disposed on the outer wall of the first balloon and the second balloon; and

[0012] The guide wire cavity is arranged in the tube wall of the suction tube holder and is used for allowing the guide wire to pass through and guide the suction tube holder to move in the blood vessel.

[0013] In some embodiments of the present application, the crushing assembly includes a plurality of connecting parts located at an end face of the suction sleeve extending from the front end and arranged at circumferential intervals along the suction sleeve, the plurality of connecting parts extend along the length direction of the suction sleeve, and the plurality of connecting parts are commonly connected to a guide part having an arc-shaped outer peripheral surface at one end away from the suction sleeve.

[0014] In some embodiments of the present application, the extension piece is an auxiliary catheter, and the air delivery channel includes a first air channel and a second air channel that are connected to each other, the first air channel is arranged in the tube wall of the suction catheter and extends along the length direction of the suction catheter, and the second air channel is arranged in the auxiliary catheter and extends along the length direction of the auxiliary catheter;

[0015] An air supply tube is connected to the end of the first airway away from the second airway, and the end of the second airway away from the first airway is closed; air holes are respectively provided at the corresponding parts of the first airway and the first balloon, and at the corresponding parts of the second airway and the second balloon, so that the first balloon and the second balloon are connected to the first airway and the second airway respectively through the air holes.

[0016] In some embodiments of the present application, a first annular groove is coaxially provided on the outer peripheral wall of the suction catheter, the first balloon is sleeved in the first annular groove and the first balloon is at least partially accommodated in the first annular groove.

[0017] In some embodiments of the present application, a second annular groove is coaxially provided on the outer peripheral wall of the auxiliary catheter, the second balloon is sleeved in the second annular groove and the second balloon is at least partially accommodated in the second annular groove.

[0018] In some embodiments of the present application, the guidewire cavity includes a first guide cavity and a second guide cavity which are connected to each other, wherein the first guide cavity is arranged in the wall of the suction catheter and extends along the length direction of the suction catheter, and the second guide cavity is arranged in the wall of the auxiliary catheter and penetrates along the length direction of the auxiliary catheter;

[0019] The first guide cavity has an inlet connected to the outside at one end away from the second guide cavity, and the second guide cavity has an outlet connected to the outside at one end away from the first guide cavity.

[0020] In some embodiments of the present application, the connecting member is a flexible metal member, the guiding member is a spherical metal member, and a plurality of the connecting members and the guiding member are connected by welding.

[0021] In some embodiments of the present application, the front end and the end of the extension piece away from the suction catheter are both provided with an inclined surface, and the inclined surface is arranged to be inclined downward from the tail end toward the front end.

[0022] In some embodiments of the present application, the diameter and length of the first balloon are greater than those of the second balloon.

[0023] Compared with the prior art, the double-balloon coronary thrombus aspiration catheter of the embodiment of the present invention has the following beneficial effects: in the present solution, a suction sleeve is movably provided in the suction catheter, and an umbrella-shaped connecting piece and a guide piece are provided at the front end of the suction sleeve. On the one hand, the suction port can be brought close to the thrombus by moving the suction sleeve, and at the same time, the suction sleeve is forwarded and rotated to crush large thrombi, which helps to improve the aspiration efficiency of the thrombus. On the other hand, the guide piece plays a certain guiding role in the process of the suction catheter moving along the blood vessel, so as to avoid the end of the suction sleeve directly contacting the inner wall of the blood vessel, so as to avoid damage to the blood vessel wall during the movement of the suction catheter; at the same time, the first balloon and the second balloon arranged at intervals in the front and back are used to block the space where the thrombus is located, so as to avoid overflow of the thrombus during aspiration, thereby effectively improving the aspiration efficiency and effect of the thrombus and ensuring the safety and effectiveness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall structure of the present invention after cross-section;

[0027] Figure 4 This is an enlarged schematic diagram of the structure at A of the present invention;

[0028] Figure 5 It is an enlarged schematic diagram of the structure at B of the present invention;

[0029] Figure 6 This is a schematic diagram of an enlarged state of the structure at position C of the present invention;

[0030] Figure 7 It is a schematic diagram of another viewing angle of the overall structure of the present invention;

[0031] Figure 8 It is an enlarged schematic diagram of the structure at D of the present invention;

[0032] Fig. 9It is a cross-sectional schematic diagram of the connection relationship between the auxiliary catheter and the suction catheter of the present invention.

[0033] In the figure, 1, suction catheter; 11, suction channel; 12, front end; 13, rear end; 14, first annular groove; 15, inclined surface;

[0034] 2. Suction cannula;

[0035] 3. Connecting parts; 4. Guide parts;

[0036] 5. Auxiliary conduit; 51. Second annular groove;

[0037] 6. The first balloon;

[0038] 7. Second balloon;

[0039] 8. air supply channel; 81. first air channel; 82. second air channel; 83. air supply pipe; 84. air hole;

[0040] 9. Guidewire cavity; 91. First guide cavity; 92. Second guide cavity; 93. Introduction port; 94. Introduction port. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0043] like Figure 1-Figure 9As shown, the embodiment of the present application proposes a double-balloon coronary thrombus aspiration catheter, including a suction catheter 1, a suction channel 11 is provided along the length extension direction of the suction catheter 1, and the suction catheter 1 has a front end 12 and a rear end 13 arranged oppositely; a suction sleeve 2 can be movably inserted into the suction channel 11, and the suction catheter 1 and the suction sleeve 2 in this scheme are made of materials with high strength and good wear resistance, such as stainless steel, titanium alloy, etc.; at the same time, in order to improve the flexibility and bending resistance of the catheter, a layer of polymer material can be coated on the surface of the suction catheter 1 and the suction sleeve 2; the suction sleeve 2 extends from the front end 12 at one end, and a plurality of connecting members 3 extending along the length direction of the suction sleeve 2 are provided at intervals along the circumference of the suction sleeve 2, and the plurality of connecting members 3 are connected to a guide member 4 at one end away from the suction sleeve 2, and the outer wall of the guide member 4 is arc-shaped, and the plurality of connecting members 3 are connected to the guide member 4 to form an umbrella-shaped structure; an extension member is connected to the suction catheter 1 On the tube wall on one side of the front end 12, an extension piece is arranged along the length extension direction of the suction catheter 1; the extension piece and the suction catheter 1 constitute a suction tube rack; the first balloon 6 is sleeved on the outer peripheral wall of the suction catheter 1 along the circumference of the suction catheter 1; the second balloon 7 is arranged at intervals from the first balloon 6 and sleeved on the outer peripheral wall of the extension piece along the circumference of the extension piece; the air supply channel 8 is arranged in the tube wall of the suction tube rack and is connected with the first balloon 6 and the second balloon 7 respectively; a metal marking band is arranged on the outer peripheral wall of the first balloon 6 and the second balloon 7. Since the metal marking band is not transparent to X-rays, it serves as a mark under the image so that medical staff can clearly obtain the position of the first balloon 6 and the second balloon 7 in the blood vessel. The metal marking band in this scheme can be made of platinum / tungsten alloy and is set on the first balloon 6 and the second balloon 7 by pasting or embedding; and a guide wire cavity 9 is arranged in the tube wall of the suction tube rack, which is used to allow the guide wire to pass through and guide the suction tube rack to move.

[0044] In specific use, such as Figure 1As shown, the medical staff first extends the suction sleeve 2 from the rear end 13 into the suction catheter 1 and extends the suction sleeve 2 from the front end 12, so that the umbrella-shaped structure composed of a plurality of connecting members 3 and the guide member 4 extends outward from the suction catheter 1, so that the umbrella-shaped structure is between the first balloon 6 and the second balloon 7. Then the medical staff delivers the suction tube holder composed of the extension member and the suction catheter 1 into the blood vessel, and makes the suction sleeve 2 inserted in the suction channel 11 move synchronously with the suction tube holder; the medical staff observes the blood vessel image under X-ray, and judges the position of the first balloon 6 and the second balloon 7 in the blood vessel through the metal marking bands arranged on the outer walls of the first balloon 6 and the second balloon 7; in the above process During the process, the medical staff passes the guide wire through the guide wire cavity 9 to guide the suction tube holder into the blood vessel and allows the suction tube holder to move in the blood vessel under the guidance of the guide wire, so that the extension passes through the thrombus and the thrombus is located in the area between the first balloon 6 and the second balloon 7; during the movement of the suction catheter 1 in the blood vessel, through the umbrella-shaped structure composed of multiple connecting parts 3 and the guide part 4 arranged on the suction sleeve 2, when the suction catheter 1 moves in the blood vessel to a relatively curved part of the blood vessel, the end of the suction sleeve 2 will not directly contact the inner wall of the curved part of the blood vessel, but the guide part 4 will directly contact the inner wall of the curved part of the blood vessel. Since the outer wall of the guide part 4 is arc-shaped, it can better avoid scratching the inner wall of the blood vessel.

[0045] Then the medical staff inflates the first balloon 6 and the second balloon 7 through the air supply channel 8 respectively, so that the first balloon 6 and the second balloon 7 expand. The first balloon 6 is used to close the blood vessel (prevent blood flow), and the second balloon 7 is used to prevent the thrombus at the distal position from overflowing to the distant during the thrombus aspiration process, so that the thrombus is effectively blocked between the first balloon 6 and the second balloon 7; then the medical staff uses an external suction tool and the suction sleeve 2 to complete the suction of the thrombus between the first balloon 6 and the second balloon 7. If the thrombus is large in size, the medical staff can move the suction sleeve 2 forward and backward (so that the suction sleeve 2 moves forward and backward relative to the suction channel 11) with the help of an umbrella-shaped structure composed of multiple connectors 3 and guide members 4 arranged on one end of the suction sleeve 2 extending from the front end 12 to crush the larger thrombus block, thereby turning the large thrombus block into a small thrombus, so as to facilitate the smooth progress of the suction process, avoid the larger thrombus block from blocking the suction sleeve 2, and improve the efficiency of thrombus aspiration.

[0046] In some embodiments of the present application, the extension piece is an auxiliary catheter 5. The auxiliary catheter 5 in this solution should be as thin as possible because the auxiliary catheter 5 needs to pass through the thrombus so that the thrombus is in the area wrapped by the first balloon 6 and the second balloon 7. Therefore, the thinner the auxiliary catheter 5 is, the easier it is to pass through the thrombus without causing a large displacement of the thrombus; the air supply channel 8 includes a first air channel 81 and a second air channel 82 that are interconnected. The first air channel 81 is arranged in the tube wall of the suction catheter 1 and extends along the length direction of the suction catheter 1, and the second air channel 82 is arranged in the auxiliary catheter 5 and extends along the length direction of the auxiliary catheter 5; the first air channel 81 is connected to an air supply tube 83 at one end away from the second air channel 82, and the second air channel 82 is closed at one end away from the first air channel 81; Figure 4 and Figure 5 As shown, air holes 84 are respectively provided at the corresponding parts of the first air channel 81 and the first balloon 6 , and at the corresponding parts of the second air channel 82 and the second balloon 7 , so that the first balloon 6 and the second balloon 7 are connected to the first air channel 81 and the second air channel 82 via the air holes 84 .

[0047] In this embodiment, the auxiliary catheter 5 is connected to the end face of the tube wall of the suction catheter 1 at the front end 12, and extends along the length direction of the suction catheter 1. The setting of the auxiliary catheter 5 does not affect the movement of the suction sleeve 2 relative to the suction catheter 1. After the suction catheter 1 and the auxiliary catheter 5 are sent to the predetermined position, the medical staff uses an external air pump or other air supply components to transport air to the air supply channel 8 through the air supply pipe 83, so that the air is sent into the first air channel 81 and the second air channel 82, and is respectively sent into the first balloon 6 and the second balloon 7 through the air hole 84, so that the first balloon 6 and the second balloon 7 are expanded; the blood in the blood vessel is blocked by the expanded first balloon 6, and the thrombus at the distal position is restricted by the expanded second balloon 7, so as to prevent the thrombus at the distal position from overflowing (diffusion) to the distance during the suction process, so that the thrombus is effectively blocked in the area between the expanded first balloon 6 and the second balloon 7. After the thrombus aspiration process is completed, the gas is extracted outwards, so that the first balloon 6 and the second balloon 7 become deflated again, thereby facilitating the withdrawal of the aspiration catheter 1 and the auxiliary catheter 5 from the blood vessel.

[0048] In some embodiments of the present application, in order to further reduce the damage to the blood vessel wall caused by the suction catheter 1 during the movement in the blood vessel, such as Figure 2 As shown, a first annular groove 14 is coaxially provided on the outer peripheral wall of the suction catheter 1, and the first balloon 6 is sleeved in the first annular groove 14 and the first balloon 6 is at least partially accommodated in the first annular groove 14; a second annular groove 51 is coaxially provided on the outer peripheral wall of the auxiliary catheter 5, and the second balloon 7 is sleeved in the second annular groove 51 and the second balloon 7 is at least partially accommodated in the second annular groove 51.

[0049] When the first balloon 6 and the second balloon 7 are not inflated and are in a deflated state, the bodies of the first balloon 6 and the second balloon 7 are as close as possible to the corresponding first annular groove 14 and second annular groove 51, so that the outer peripheral walls of the suction catheter 1 and the auxiliary catheter 5 are as flat as possible. When the suction catheter 1 and the auxiliary catheter 5 move in the blood vessel under the guidance of the guide wire, they do not protrude from the outer walls of the suction catheter 1 and the auxiliary catheter 5 as much as possible or protrude from the outer walls of the suction catheter 1 and the auxiliary catheter 5 as little as possible to reduce damage to the inner wall of the blood vessel during movement in the blood vessel.

[0050] In some embodiments of the present application, Figure 6 , Fig. 9 As shown, the guidewire cavity 9 includes a first guide cavity 91 and a second guide cavity 92 which are interconnected. The first guide cavity 91 is arranged in the wall of the suction catheter 1 and extends along the length direction of the suction catheter 1, and the second guide cavity 92 is arranged in the wall of the auxiliary catheter 5 and penetrates along the length direction of the auxiliary catheter 5; the first guide cavity 91 has an inlet 93 connected to the outside at one end away from the second guide cavity 92, and the second guide cavity 92 has an outlet 94 connected to the outside at one end away from the first guide cavity 91.

[0051] The medical staff extends the guide wire from the introduction port 93 into the first guide cavity 91 and through the second guide cavity 92, and finally extends the auxiliary catheter 5 outward through the introduction port 94 located on the side of the second guide cavity 92 away from the first guide cavity 91, so that the suction tube rack composed of the suction catheter 1 and the auxiliary catheter 5 moves under the guidance of the guide wire.

[0052] In some embodiments of the present application, the connecting member 3 is a flexible metal member, such as a stainless steel wire; the guiding member 4 is a spherical metal member, and a plurality of connecting members 3 and guiding members 4 are connected by welding.

[0053] In some embodiments of the present application, the front end 12 and the auxiliary catheter 5 are both provided with a slope 15 at one end away from the suction catheter 1, and the slope 15 is arranged to be inclined downward from the tail end 13 toward the front end 12; setting the above-mentioned part as the slope 15 helps the suction catheter 1 and the auxiliary catheter 5 to enter the blood vessel and move in the blood vessel along the guidance of the guide wire.

[0054] In some embodiments of the present application, the diameter and length of the first balloon 6 are greater than those of the second balloon 7. The first balloon 6 is mainly used to block the proximal blood vessel. Therefore, the first balloon 6 is made of a semi-compliant material (the diameter of the first balloon 6 after inflation is 1:1 with the blood vessel) to block the blood as much as possible; the second balloon 7 is mainly used to prevent the thrombus at the distal position from spreading to the distant place; in this scheme, flushing fluid or drugs can also be injected along the suction catheter 2 to flush and aspirate the inflammatory mediators and small thrombi in the blood vessels. Before injecting drugs or flushing, the amount of inflation in the second balloon 7 (which is a compliant material balloon) can be appropriately increased to match the expansion degree of the second balloon 7 with the size of the distal blood vessel so that it can fit the inner wall of the blood vessel as much as possible, thereby blocking both ends of the blood vessel with the cooperation of the first balloon 6 and the second balloon 7, clearing the inflammatory mediators and small thrombi around the thrombus in the blood vessel, and reducing the risk of no-reflow in the blood vessel.

[0055] In some embodiments of the present application, the extension piece has different length specifications, and the balloon also has different size specifications. According to the size of the patient's blood vessel and the length and range of the thrombus, a balloon of corresponding size is selected, and the distance between the first balloon 6 and the second balloon 7 is adjusted to obtain aspiration tube racks with different specifications, ensuring that the thrombus can be aspirated as completely as possible.

[0056] The working process of the present invention is as follows: after the medical staff delivers the suction tube rack composed of the suction catheter 1 and the auxiliary catheter 5 to the predetermined position, air is delivered to the first balloon 6 and the second balloon 7 through the air delivery channel 8 with the help of an air pump or other air delivery components, so that the first balloon 6 and the second balloon 7 expand, and the thrombus is located in the area between the first balloon 6 and the second balloon 7, and then the thrombus between the first balloon 6 and the second balloon 7 is sucked out through the suction sleeve 2. If the thrombus is large in volume, the thrombus can be crushed by moving the suction sleeve 2 back and forth to facilitate the smooth progress of the suction process. When the thrombus is sucked out, the gas in the first balloon 6 and the second balloon 7 is discharged, and the suction tube rack can be withdrawn from the blood vessel, thereby completing the suction of the thrombus.

[0057] In summary, the embodiment of the present invention provides a double-balloon coronary thrombus aspiration catheter. In this scheme, a suction sleeve 2 is movably inserted into the suction catheter 1, and an umbrella-shaped connecting piece 3 and a guide piece 4 are provided at the front end 12 of the suction sleeve 2. On the one hand, by moving the suction sleeve 2, a larger thrombus can be crushed, which is helpful for the subsequent aspiration of the thrombus. On the other hand, the guide piece 4 plays a certain guiding role in the process of the suction catheter 1 moving along the blood vessel, thereby avoiding the end of the suction sleeve 2 directly contacting the inner wall of the blood vessel, thereby avoiding damage to the blood vessel wall during the movement of the suction catheter 1; at the same time, the first balloon 6 and the second balloon 7 arranged at intervals in the front and back are used to block the space where the thrombus is located, thereby avoiding the overflow of the thrombus during the aspiration process; finally, the suction catheter 1 or the suction sleeve 2 can be injected with water and medicine for a second aspiration, thereby effectively improving the aspiration efficiency and aspiration effect of the thrombus.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical principles of the present invention, several improvements and substitutions can be made for the thrombus aspiration treatment of peripheral blood vessels and cerebral blood vessels. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. Double-balloon coronary thrombus aspiration catheter, characterized in that: include: A suction conduit, wherein a suction channel is provided along the length of the suction conduit, and the suction conduit has a front end and a rear end that are arranged opposite to each other; A suction sleeve, which can be movably inserted into the suction channel and has two ends extending out of the front end and the rear end respectively, and one end of the suction sleeve extending out of the front end is provided with a crushing component for crushing thrombus; An extension piece connected to the end surface of the tube wall of the suction tube at the front end, the extension piece is arranged along the length extension direction of the suction tube; the extension piece and the suction tube form a suction tube rack; A first balloon is disposed on a side of the suction catheter close to the front end and is sleeved on the outer peripheral wall of the suction catheter along the circumference of the suction catheter; A second balloon is disposed on a side of the extension member away from the front end and sleeved on an outer peripheral wall of the extension member along the circumferential direction of the extension member, and the crushing assembly is located between the first balloon and the second balloon; An air supply channel is provided in the tube wall of the suction tube holder and is connected to the first balloon and the second balloon respectively; A metal marking band is arranged on the outer wall of the first balloon and the second balloon; as well as The guide wire cavity is arranged in the tube wall of the suction tube holder and is used for allowing the guide wire to pass through and guide the suction tube holder to move in the blood vessel.

2. The double-balloon coronary thrombus aspiration catheter according to claim 1, characterized in that: The crushing assembly includes a plurality of connecting parts located at an end face of the suction sleeve extending from the front end and arranged at intervals along the circumference of the suction sleeve. The plurality of connecting parts extend along the length direction of the suction sleeve, and the plurality of connecting parts are commonly connected to a guide part having an arc-shaped outer peripheral surface at one end away from the suction sleeve.

3. The double-balloon coronary thrombus aspiration catheter according to claim 1, characterized in that: The extension piece is an auxiliary conduit, and the air delivery passage comprises a first air passage and a second air passage which are connected to each other, wherein the first air passage is arranged in the tube wall of the suction conduit and extends along the length direction of the suction conduit, and the second air passage is arranged in the auxiliary conduit and extends along the length direction of the auxiliary conduit; An air supply tube is connected to the end of the first airway away from the second airway, and the end of the second airway away from the first airway is closed; air holes are respectively provided at the corresponding parts of the first airway and the first balloon, and at the corresponding parts of the second airway and the second balloon, so that the first balloon and the second balloon are connected to the first airway and the second airway respectively through the air holes.

4. The double-balloon coronary thrombus aspiration catheter according to claim 3, characterized in that: A first annular groove is coaxially arranged on the outer peripheral wall of the suction catheter, the first balloon is sleeved in the first annular groove and the first balloon is at least partially accommodated in the first annular groove.

5. The double-balloon coronary thrombus aspiration catheter according to claim 3, characterized in that: A second annular groove is coaxially arranged on the outer peripheral wall of the auxiliary catheter, the second balloon is sleeved in the second annular groove and the second balloon is at least partially accommodated in the second annular groove.

6. The double-balloon coronary thrombus aspiration catheter according to claim 3, characterized in that: The guidewire cavity comprises a first guide cavity and a second guide cavity which are connected to each other, wherein the first guide cavity is arranged in the wall of the suction catheter and extends along the length direction of the suction catheter, and the second guide cavity is arranged in the wall of the auxiliary catheter and penetrates along the length direction of the auxiliary catheter; The first guide cavity has an inlet connected to the outside at one end away from the second guide cavity, and the second guide cavity has an outlet connected to the outside at one end away from the first guide cavity.

7. The double-balloon coronary thrombus aspiration catheter according to claim 2, characterized in that: The connecting piece is a flexible metal piece, the guiding piece is a spherical metal piece, and a plurality of the connecting pieces are connected to the guiding piece by welding.

8. The double-balloon coronary thrombus aspiration catheter according to claim 1, characterized in that: The front end and the end of the extension piece away from the suction catheter are both provided with an inclined surface, and the inclined surface is arranged to be inclined downward from the tail end toward the front end.

9. The double-balloon coronary thrombus aspiration catheter according to claim 1, characterized in that: The diameter and length of the first balloon are both greater than those of the second balloon.

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