A dilation injection system for preventing and treating arterial stenosis

Abstract

The present invention relates to an expansion injection system for preventing and treating arterial stenosis, comprising a catheter, wherein the catheter has a guidewire channel and a water injection channel extending along the long axis direction thereof; a first balloon, which is wrapped at one end of the catheter, and whose inner cavity is connected to the water injection channel, and both ends of the first balloon are tapered structures after being expanded by water injection; a catheter connector, which is connected to the other end of the catheter, and is provided with a water injection port and a drug injection port, the water injection channel is connected to the water injection channel, and the drug injection port is connected to a puncture guide tube seat; a guidewire port is provided on the catheter connector or the catheter, and the guidewire port is connected to the guidewire channel; a puncture guide tube is arranged in the catheter, one end of which passes through the catheter and is attached to the conical surface of one end of the first balloon close to it along the long axis direction of the catheter, and the other end of the puncture guide tube extends through the inside of the catheter to be connected to the puncture guide tube seat; a puncture needle, the needle tail is connected to a needle tube, and can enter from the puncture guide tube seat. Advantages: The stability of the puncture angle is ensured, and the balloon is effectively protected from damage.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a dilation injection system for preventing and treating arterial stenosis. Background Art

[0002] Peripheral arterial disease (PAD) is a disease caused by the formation of peripheral atherosclerotic plaques, which leads to peripheral arterial stenosis and occlusion, and then chronic limb ischemia. It is an important cause of death and disability in the global disease spectrum, and its mortality rate is second only to coronary heart disease and stroke among cardiovascular and cerebrovascular diseases.

[0003] The main methods of intracavitary treatment technology at present are balloon angioplasty and stent implantation. The long-term restenosis rate of traditional balloon angioplasty can be as high as 80%, while stent implantation brings new problems such as stent-related complications (stent migration, fracture, stent thrombosis, etc.) and stent restenosis.

[0004] Drug-coated balloons (DCB) and drug-eluting stents (DES) have become new hotspots for peripheral vascular diseases in recent years. DCB and DES mainly use paclitaxel drugs. The drug coating can inhibit vascular intimal hyperplasia, smooth muscle hyperplasia and migration, etc., thereby preventing restenosis. However, DCB and DES also have some disadvantages. The main one is that the sprayed drug can only contact the vascular intima for a short time, and the osmotic drug delivery is easily washed away by the blood flow, and the local drug concentration is difficult to maintain, affecting the efficacy; secondly, the easy elution of the drug leads to an increase in systemic drug concentration, resulting in drug side effects.

[0005] At present, foreign patent US7559923 (domestic patent CN107360123A) describes a system for inhibiting vascular inflammation, which mainly solves the defect that the drug is easily washed away by the blood flow after the drug-coated balloon is placed. The system consists of a balloon catheter part and a drug injection part, wherein the balloon part mainly adapts to different blood vessel diameters and pushes the microneedle used for drug injection into the blood vessel interlayer, mainly providing pressure. Generally, vascular stenosis needs to be first dilated by balloon, and then the balloon injection system in the existing technology is replaced to inject drugs to achieve the purpose of treatment.

[0006] In addition, CNB introduces an intracavitary injection catheter device, including a hollow catheter body and an injection mechanism. The injection mechanism includes a support component, an end, a hollow pull tube and an injection needle. The pull-back action of the hollow pull tube causes the support component to expand radially and drives the injection needle guide hole to provide guidance and support for the injection needle to achieve the injection function. However, the expansion of the support component in this patented technology cannot achieve the expansion of the narrow part of the cavity; secondly, the device achieves the expansion and repositioning of the support component through the pull-back action. The pull-back action easily changes the position of the intracavitary support component, resulting in inaccurate positioning. Pulling back by hand is not only unstable, but also difficult to control the strength, which causes the puncture angle to change. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an expansion injection system for preventing and treating arterial stenosis, which effectively overcomes the defects of the prior art.

[0008] The technical solution of the present invention to solve the above technical problems is as follows:

[0009] A dilatation injection system for preventing and treating arterial stenosis comprises: a catheter, wherein the catheter has a guide wire channel and a water injection channel extending along the long axis direction thereof; a first balloon, wherein the first balloon is wrapped and arranged at one end of the catheter, and the inner cavity of the first balloon is connected to the water injection channel, and both ends of the first balloon are tapered structures after the first balloon is expanded by water injection; a catheter connector, wherein the catheter connector is connected to the other end of the catheter, and is provided with a water injection port and a drug injection port, wherein the water injection channel is connected to the corresponding end of the water injection channel, and the drug injection port is connected to a puncture guide tube seat; a first balloon is provided on the catheter connector or the other end of the catheter to connect the first balloon and the second balloon. A guidewire port of the guidewire channel, the guidewire port is connected to the corresponding end of the guidewire channel; a puncture guide tube, the puncture guide tube is arranged in the catheter, one end of which passes through one end of the catheter and is fixed on the conical surface of one end of the first balloon close to it along the long axis direction of the catheter, and the other end of the puncture guide tube extends through the inside of the catheter to be connected to the puncture guide tube seat; a puncture needle, the needle tail of the puncture needle is connected with a needle tube, the puncture needle can enter through the puncture guide tube seat, and under external force, it is pushed and pulled through the needle tube until its needle tip is pushed out or retracted from one end of the puncture guide tube.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, one end of the puncture guide tube seat extends into the injection port, and the two are sealed and connected to each other. A needle tube intervention cavity is provided inside the other end of the puncture guide tube seat, and the other end of the puncture guide tube passes through one end of the puncture guide tube seat and is connected to the needle tube intervention cavity.

[0012] Furthermore, it also includes a needle tube seat, one end of which is provided with a tubular cavity inside, and the other end of which is provided with a socket part matching the above-mentioned needle tube intervention cavity, the end of the above-mentioned needle tube away from the above-mentioned puncture needle is inserted into the above-mentioned socket part, and extends to be connected with the end of the above-mentioned tubular cavity close to it, the above-mentioned socket part is used to be inserted into the above-mentioned needle tube intervention cavity, and slide along the above-mentioned needle tube intervention cavity under the action of external force, thereby pushing and pulling the above-mentioned needle tube so that the needle tip of the puncture needle is pushed out or retracted from one end of the above-mentioned puncture guide tube.

[0013] Furthermore, the above-mentioned puncture guide tubes are provided in plurality, and one end of each of them passes through one end of the above-mentioned catheter, and are respectively evenly fitted and fixed on the conical surface along the axial direction of the conical structure of the corresponding end of the above-mentioned first balloon. Correspondingly, the above-mentioned puncture needles are provided in plurality, and the number is consistent with the number of the above-mentioned puncture guide tubes. The needle tail of each of the above-mentioned puncture needles is connected to the above-mentioned needle tube, and the above-mentioned puncture needles respectively pass through the above-mentioned puncture guide tube seats and enter the corresponding above-mentioned puncture guide tubes.

[0014] Furthermore, at least two first radiopaque developing marking rings are provided along the long axis direction of the area on the surface of the catheter within the coverage of the first balloon.

[0015] Further, the above-mentioned catheter joint is a four-way joint, one interface of which is sealed and connected to the other end of the above-mentioned catheter and communicated, and the remaining three interfaces respectively constitute the above-mentioned water injection port, guide wire port and drug injection port, and the above-mentioned guide wire channel extends to be connected and communicated with the above-mentioned guide wire port; or the above-mentioned catheter joint is a three-way joint, one interface of which is sealed and connected to the other end of the above-mentioned catheter 1 and communicated with the remaining two interfaces respectively constitute the above-mentioned water injection port and drug injection port, and the other end of the above-mentioned catheter is provided with a guide wire quick exchange port connected to the above-mentioned guide wire channel, and the guide wire quick exchange port constitutes the above-mentioned guide wire port.

[0016] Furthermore, the catheter comprises an outer tube and an inner tube arranged inside the outer tube, the other ends of the outer tube and the inner tube are connected to the catheter joint, and an inner cavity for the puncture guide tube to pass through is formed between the outer tube and the inner tube, one end of the inner tube extends out of one end of the outer tube, the first balloon is wrapped and arranged outside one end of the inner tube and close to one end of the outer tube, and the guide wire channel and the water injection channel are provided in the inner tube along its long axis direction; one end of the puncture guide tube passes through the outer wall of one end of the outer tube, and extends along the outer wall of one end of the outer tube to be fitted and fixed on the conical surface of one end of the first balloon close to it, or one end of the puncture guide tube passes through one end of the outer tube along the inner wall of the outer tube, and extends to be fitted and fixed on the conical surface of one end of the first balloon close to it.

[0017] Furthermore, it also includes a second balloon, which is wrapped around one end of the inner tube and spaced apart from one end of the first balloon away from the catheter connector, and one end of the second balloon extends to connect and communicate with the other end of the first balloon.

[0018] Furthermore, at least two second radiopaque developing marking rings are provided along the long axis direction of the area on the surface of the catheter within the coverage of the second balloon.

[0019] The beneficial effects of the present invention are: reasonable structural design ensures the stability of the puncture angle, and at the same time, effectively protects the balloon from damage, which is conducive to repeated multi-point puncture of the blood vessel, and the non-compliant balloon ensures the effectiveness of expansion and the consistency of the puncture angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the dilation injection system for preventing and treating arterial stenosis of the present invention;

[0021] Figure 2 Another structural schematic diagram of the dilation injection system for preventing and treating arterial stenosis of the present invention;

[0022] Figure 3 It is a structural schematic diagram of another embodiment of the dilation injection system for preventing and treating arterial stenosis of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the first balloon in the dilatation injection system for preventing and treating arterial stenosis of the present invention when it is folded;

[0024] Figure 5 It is a schematic structural diagram of the first balloon in the dilation injection system for preventing and treating arterial stenosis of the present invention when it is inflated;

[0025] Figure 6 The structure diagram of the cooperation between the needle tube seat and the puncture guide tube seat in the dilation injection system for preventing and treating arterial stenosis of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 7 The structure diagram of the cooperation between the needle tube seat and the puncture guide tube seat in the dilation injection system for preventing and treating arterial stenosis of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 8 It is a partial structural schematic diagram of a dilation injection system for preventing and treating arterial stenosis of the present invention, which is provided with multiple needles;

[0028] Fig. 9 The present invention is a schematic diagram of the local structure of the dilation injection system for preventing and treating arterial stenosis provided with two balloons.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Catheter; 2. First balloon; 3. Catheter connector; 4. Puncture guide tube; 5. Puncture needle; 6. Needle tube seat; 7. Second balloon; 11. First developing marker ring; 12. Second developing marker ring; 13. Outer tube; 14. Inner tube; 31. Water injection port; 32. Guide wire port; 33. Drug injection port; 34. Puncture guide tube seat; 51. Needle tube; 61. Insertion socket; 341. Needle tube intervention cavity. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] Embodiment 1: Figure 1 , 2 As shown in Figures 3, 4 and 5, the dilatation injection system for preventing and treating arterial stenosis of this embodiment comprises a catheter 1, wherein the catheter 1 has a guidewire channel and a water injection channel extending along its long axis direction; a first balloon 2, wherein the first balloon 2 is wrapped and arranged at one end of the catheter 1, and its inner cavity is connected to the water injection channel, and both ends of the first balloon 2 are tapered structures after being expanded by water injection; a catheter connector 3, wherein the catheter connector 3 is connected to the other end of the catheter 1, and is provided with a water injection port 31 and a drug injection port 33, wherein the water injection channel is connected to the corresponding end of the water injection channel, and the drug injection port 33 is connected to a puncture guide tube seat 34; a connecting tube 3 is provided on the catheter connector 3 or the other end of the catheter 1 A guidewire port 32 passing through the guidewire channel, the guidewire port 32 is connected to the corresponding end of the guidewire channel; a puncture guide tube 4, the puncture guide tube 4 is arranged in the catheter 1, one end of which passes through one end of the catheter 1, and is fitted and fixed on the conical surface of one end of the first balloon 2 close to it along the long axis direction of the catheter 1, and the other end of the puncture guide tube 4 extends through the inside of the catheter 1 to be connected with the puncture guide tube seat 34; a puncture needle 5, the needle tail of the puncture needle 5 is connected with a needle tube 51, the puncture needle 5 can enter through the puncture guide tube seat 34, and under external force, it is pushed and pulled by the needle tube 51 until its needle tip is pushed out or retracted from one end of the puncture guide tube 4.

[0033] The preoperative preparation process is as follows:

[0034] In the first step, the guide wire is pushed along the blood vessel to the treatment site, and then the catheter 1 is pushed in along the guide wire, and according to the imaging position of the first balloon 2 under DSA, it is confirmed that the first balloon 2 has reached the designated position.

[0035] In the second step, water is injected into the water injection port 31, and the water enters the catheter 1 and the first balloon 2, so that the first balloon 2 expands, and the narrowed blood vessel can be expanded. At the same time, the expansion of the first balloon 2 causes the conical structure at its end to expand and recover, and the puncture guide tube 4 section attached to the conical surface bends along the conical angle (forming an angle with the catheter 1, that is, an angle with the direction of the blood vessel, and the angle is about 30°-45°).

[0036] In the third step, the needle tube 51 is connected to the syringe with medicine, and the needle tube 51 is pushed so that the needle tube 51 is slowly pushed along the direction of the puncture guide tube 4 until the puncture needle 5 punctures the adventitia of the blood vessel. At this time, the medicine in the syringe can be injected.

[0037] Step 4: After the injection is completed, the needle puncture needle 5 and the needle tube 51 are retracted along the original path, and the water in the first balloon 2 is extracted to restore the first balloon 2 to the initial folded (deflated) state. Then, the catheter 1 and the guide wire are withdrawn in sequence.

[0038] If there are multiple places that need to be injected, you can repeat the operations of injecting water, pushing the needle, injecting medicine, withdrawing the needle, and pumping out water.

[0039] The whole system structure is reasonably designed to ensure the stability of the puncture angle. At the same time, it effectively protects the balloon from damage, which is conducive to repeated multi-point puncture of the blood vessels. The non-compliant balloon ensures the effectiveness of expansion and the consistency of the puncture angle.

[0040] In this embodiment, the catheter connector 3 involves at least the following two structures:

[0041] 1) If Figure 1 and 2 As shown, the catheter connector 3 is a four-way connector, one interface of which is sealed and connected to the other end of the catheter 1, and the remaining three interfaces respectively constitute the water injection port 31, the guide wire port 32 and the drug injection port 33, and the guide wire channel extends to be connected and connected to the guide wire port 32.

[0042] In this embodiment, the four-way joint is a special joint, which is mainly composed of a straight main passage and two branches connected to the main passage. The two ends of the main passage constitute the two interfaces of the four-way joint, and the ends of the two branches constitute the remaining two interfaces (respectively, the water injection port 31 and the guide wire port 32). One end of the main passage and the other end of the catheter 1 are inserted into each other (sealed and connected), and the other end constitutes the drug injection port 33, which is convenient for different operations through different ports, and the order of each interface is relatively reasonable.

[0043] 2) If Figure 3 As shown, the catheter connector 3 is a three-way connector, one interface of which is sealedly connected to the other end of the catheter 1 and connected to the other two interfaces to respectively constitute the water injection port 31 and the drug injection port 33, and the other end of the catheter 1 is provided with a guidewire quick exchange port connected to the guidewire channel, and the guidewire quick exchange port constitutes the guidewire port 32.

[0044] In this embodiment, the guidewire can be quickly and conveniently inserted through the guidewire rapid exchange port, and the catheter does not need to be replaced at any time during the guidewire operation process. At the same time, the balloon dilatation catheter does not need to be extended with a guidewire.

[0045] As a preferred embodiment, the above-mentioned puncture guide tube seat 34 is a tubular seat, one end of which extends into the above-mentioned injection port 33, and the two are sealed and connected to each other, and the other end of the above-mentioned puncture guide tube seat 34 is internally provided with a cylindrical needle tube intervention cavity 341, and the other end of the above-mentioned puncture guide tube 4 passes through one end of the above-mentioned puncture guide tube seat 34 and is connected with the above-mentioned needle tube intervention cavity 341.

[0046] In this embodiment, the needle tube intervention cavity 341 facilitates the entry of the needle tube 51 and the puncture needle 5 .

[0047] As a preferred embodiment, at least two radiopaque first development marking rings 11 are provided along the long axis direction of the area on the surface of the catheter 1 within the coverage of the first balloon 2 .

[0048] In this embodiment, the two first development marking rings 11 are reasonably designed, which is beneficial to the positioning of the first balloon 2 after it is filled.

[0049] Embodiment 2: Figure 6 and 7 As shown, it also includes a needle tube seat 6, one end of which is provided with a tubular cavity inside, and the other end of which is provided with a columnar plug-in portion 61 matching the above-mentioned needle tube intervention cavity 341. The above-mentioned needle tube intervention cavity 341 and the plug-in portion 61 are both matching columnar structures. The end of the above-mentioned needle tube 51 away from the above-mentioned puncture needle 5 penetrates into the above-mentioned plug-in portion 61, and extends to be connected with the end of the above-mentioned tubular cavity close to it. The above-mentioned plug-in portion 61 is used to be inserted into the above-mentioned needle tube intervention cavity 341, and slide along the above-mentioned needle tube intervention cavity 341 under the action of external force, thereby pushing and pulling the above-mentioned needle tube 51 so that the needle tip of the puncture needle 5 is pushed out or retracted from one end of the above-mentioned puncture guide tube 4, and multiple-point puncture blood vessel injection can be achieved in the same patient.

[0050] In this embodiment, the cooperation between the inserting portion 61 and the needle tube intervention cavity 341 can limit the insertion depth of the puncture needle 5 (that is, the length of the puncture needle 5 passing through the needle tube puncture needle 5). In addition, the needle tube seat 6 can push the puncture needle 5 and the needle tube 51, which is convenient for operation.

[0051] As a preferred embodiment, different card slots are arranged at intervals on the inner wall of the needle tube intervention cavity 341 along its long axis direction (that is, the long axis direction of the catheter 1), and a raised flexible card engaging portion is arranged at an adaptable position on the plug-in portion 61. The card engaging portion can engage at different card slots as it goes deeper into the needle tube intervention cavity 341. In other words, card slots of different distances are arranged according to different distances required for needle insertion, so that there are multiple "gear" options for the distance of advancement of the puncture needle 5 for puncture, and the card slots have a limiting function, making the use more flexible.

[0052] It should be noted that the needle tube 51 is made of nickel-titanium material and has memory. The needle tube 51 moves in the puncture guide tube 4 in the direction of the guide tube.

[0053] The rest is the same as in the first embodiment.

[0054] Embodiment 3: Figure 8 As shown, the above-mentioned puncture guide tubes 4 are provided in plurality, and one end of each of them passes through one end of the above-mentioned catheter 1, and are respectively evenly fitted and fixed on the conical surface along the axial direction of the conical structure of the corresponding end of the above-mentioned first balloon 2. Correspondingly, the above-mentioned puncture needles 5 are provided in plurality, and the number is consistent with the number of the above-mentioned puncture guide tubes 4. The needle tail of each of the above-mentioned puncture needles 5 is connected to the above-mentioned needle tube 51. The above-mentioned puncture needles 5 are respectively passed through the above-mentioned puncture guide tube seat 34 and enter the corresponding above-mentioned puncture guide tube 4.

[0055] This embodiment realizes multi-point injection drug administration, which can effectively avoid and penetrate plaques, ensure successful drug injection, and at the same time ensure multi-drug combination treatment and multi-point treatment.

[0056] This product consists of a balloon dilatation catheter and an injection system. The balloon is used to dilate the narrowed part of the artery, and then the drug is directly injected into the targeted blood vessel adventitia through the puncture needle 5, so that the drug slowly and continuously penetrates into the blood vessel intima, inhibits intimal hyperplasia, smooth muscle hyperplasia and migration, etc., thereby preventing blood vessel restenosis. It has the advantages of high local drug concentration, long drug action time, and small systemic side effects. It can replace the existing drug eluting balloon technology and improve the long-term recanalization rate of blood vessels. Its significant advantages are also reflected in the reduction of stent placement cases or the avoidance of stent placement, and it also has positive clinical effects on patients with restenosis of blood vessels after stent placement.

[0057] On the basis of the above four embodiments, the cooperation of the catheter 1 and the puncture guide tube 4 may include the following two structures:

[0058] 1) If Figure 1 , 3 As shown in Figures 4, 5, 8 and 9, the catheter 1 includes an outer tube 13 and an inner tube 14 arranged inside the outer tube 13, the other ends of the outer tube 13 and the inner tube 14 are commonly connected to the catheter joint 3, and the outer tube 13 and the inner tube 14 are provided with an inner cavity for the puncture guide tube 4 to pass through and the water injection channel, one end of the inner tube 14 extends out of one end of the outer tube 13, the first balloon 2 is wrapped and arranged outside one end of the inner tube 14, and one end thereof extends to be connected and communicated with the water injection channel, and the guide wire channel is provided in the inner tube 14 along its long axis direction; one end of the puncture guide tube 4 passes through one end along the inner wall of the outer tube 13, and extends along the surface of the extension portion of one end of the first balloon 2 to be fitted and fixed on the conical surface of one end of the first balloon 2 close to it.

[0059] 2) If Figure 2 As shown, the catheter 1 includes an outer tube 13 and an inner tube 14 arranged inside the outer tube 13, the other ends of the outer tube 13 and the inner tube 14 are connected to the catheter connector 3, and an inner cavity for the puncture guide tube 4 to pass through is formed between the outer tube 13 and the inner tube 14, one end of the inner tube 14 extends out of one end of the outer tube 13, the first balloon 2 is wrapped and arranged outside one end of the inner tube 14, and is close to one end of the outer tube 13, and the guide wire channel and the water injection channel are provided in the inner tube 14 along its long axis direction; one end of the puncture guide tube 4 passes through the outer wall of one end of the outer tube 13, and extends along the outer wall of one end of the outer tube 13 to be fitted and fixed on the conical surface of one end of the first balloon 2 close to it.

[0060] Embodiment 4: Fig. 9 As shown, on the basis of the above embodiment, it also includes a second balloon 7, which is wrapped around one end of the inner tube 14 and spaced apart from one end of the first balloon 2 away from the catheter connector 3, and one end of the second balloon 7 extends to be connected and communicated with the other end of the first balloon 2.

[0061] When the system in this embodiment is in use, after the second balloon 7 reaches the specified position, water is injected into the water injection channel through the water injection port, and the second balloon 7 is first fully filled to expand the narrowed part of the blood vessel. After the expansion is completed, the second balloon 7 contracts; the catheter 1 is continued to be pushed forward to fill and expand the second balloon 7 and the first balloon 2 through the water injection channel. After the first balloon 2 is expanded, the puncture needle 5 is operated to pass through the end of the puncture needle guide tube 4 to puncture the blood vessel adventitia, and then the drug can be injected.

[0062] As a preferred embodiment, at least two radiopaque second development marking rings 12 are provided along the long axis direction of the area on the surface of the catheter 1 within the coverage of the second balloon 7 .

[0063] The second balloon 7 is a sausage-shaped balloon, and the length of the first balloon 2 can be shorter. Under the premise of the second balloon 7, it is not used to dilate the narrowed blood vessels, but only to expand to facilitate the puncture needle 5 to penetrate the outer membrane of the blood vessel.

[0064] The rest is the same as in the first embodiment.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dilatation injection system for preventing and treating arterial stenosis, characterized in that: include: A catheter (1), wherein the catheter (1) has a guide wire channel and a water injection channel extending along its long axis; A first balloon (2), the first balloon (2) being wrapped around one end of the catheter (1), and having an inner cavity connected to the water injection channel, and both ends of the first balloon (2) being tapered after being expanded by water injection; a catheter connector (3), the catheter connector (3) being connected to the other end of the catheter (1), and being provided with a water injection port (31) and a drug injection port (33), the water injection port (31) being in communication with a corresponding end of the water injection channel, and the drug injection port (33) being connected to a puncture guide tube seat (34); A guide wire port (32) communicating with the guide wire channel is provided on the catheter connector (3) or at the other end of the catheter (1), and the guide wire port (32) is communicated with a corresponding end of the guide wire channel; A puncture guide tube (4), the puncture guide tube (4) being arranged in the catheter (1), one end of which passes through the catheter (1) and is fitted and fixed on a conical surface of one end of the first balloon (2) close to the first balloon (2) along the long axis direction of the catheter (1), and the other end of the puncture guide tube (4) extends through the interior of the catheter (1) to be connected to the puncture guide tube seat (34); A puncture needle (5), the needle tail of the puncture needle (5) being connected to a needle tube (51), the puncture needle (5) being able to enter through the puncture guide tube seat (34), and being pushed or pulled through the needle tube (51) under external force until the needle tip is pushed out or retracted from one end of the puncture guide tube (4).

2. The dilation injection system for preventing and treating arterial stenosis according to claim 1, characterized in that: One end of the puncture guide tube seat (34) extends into the drug injection port (33), and the two are sealed and connected to each other. The other end of the puncture guide tube seat (34) is provided with a needle tube intervention cavity (341). The other end of the puncture guide tube (4) passes through one end of the puncture guide tube seat (34) and is connected to the needle tube intervention cavity (341).

3. The dilation injection system for preventing and treating arterial stenosis according to claim 2, characterized in that: It also includes a needle tube seat (6), one end of which is provided with a tubular cavity inside, and the other end of which is provided with a columnar plug-in portion (61) matching the needle tube intervention cavity (341), the end of the needle tube (51) away from the puncture needle (5) penetrates into the plug-in portion (61) and extends to communicate with the end of the tubular cavity close to it, the plug-in portion (61) is used to be inserted into the needle tube intervention cavity (341) and slide along the needle tube intervention cavity (341) under the action of external force, thereby pushing and pulling the needle tube (51) so that the needle tip of the puncture needle (5) is pushed out or retracted from one end of the puncture guide tube (4).

4. A dilation injection system for preventing and treating arterial stenosis according to any one of claims 1 to 3, characterized in that: At least two radiopaque first development marking rings (11) are provided along the long axis of the area on the surface of the catheter (1) within the coverage of the first balloon (2).

5. A dilation injection system for preventing and treating arterial stenosis according to any one of claims 1 to 3, characterized in that: The puncture guide tubes (4) are provided in plurality, and one end of each of the puncture guide tubes (4) passes through one end of the catheter (1) and is evenly fitted and fixed on the conical surface along the axial direction of the conical structure at the corresponding end of the first balloon (2). The corresponding puncture needles (5) are provided in plurality, and the number is consistent with the number of the puncture guide tubes (4). The needle tail of each puncture needle (5) is connected to the needle tube (51). The puncture needles (5) are respectively passed through the puncture guide tube seat (34) and enter the corresponding puncture guide tube (4).

6. A dilation injection system for preventing and treating arterial stenosis according to any one of claims 1 to 3, characterized in that: The catheter connector (3) is a four-way connector, one interface of which is sealed and connected to and communicates with the other end of the catheter (1), and the other three interfaces respectively constitute the water injection port (31), the guide wire port (32) and the drug injection port (33), and the guide wire channel extends to connect and communicate with the guide wire port (32); or the catheter connector (3) is a three-way connector, one interface of which is sealed and connected to and communicates with the other end of the catheter (1), and the other two interfaces respectively constitute the water injection port (31) and the drug injection port (33), and the other end of the catheter (1) is provided with a guide wire quick exchange port connected to the guide wire channel, and the guide wire quick exchange port constitutes the guide wire port (32).

7. A dilation injection system for preventing and treating arterial stenosis according to any one of claims 1 to 3, characterized in that: The catheter (1) comprises an outer tube (13) and an inner tube (14) arranged inside the outer tube (13); the other ends of the outer tube (13) and the inner tube (14) are connected to the catheter joint (3); the outer tube (13) and the inner tube (14) are provided with an inner cavity for the puncture guide tube (4) to pass through and the water injection channel; one end of the inner tube (14) extends outside one end of the outer tube (13); the first balloon (2) is wrapped around one end of the inner tube (14) and one end of the first balloon (2) extends to the outside of the water injection channel; The inner tube (14) is connected and communicated with the guide wire channel, and the guide wire channel is provided in the inner tube (14) along its long axis direction; one end of the puncture guide tube (4) passes through the outer wall of one end of the outer tube (13), and extends along the outer wall of one end of the outer tube (13) to be fitted and fixed on the conical surface of one end of the first balloon (2) close to it, or one end of the puncture guide tube (4) passes through one end along the inner wall of the outer tube (13), and extends along the surface of the extension portion of one end of the first balloon (2) to be fitted and fixed on the conical surface of one end of the first balloon (2) close to it.

8. The dilation injection system for preventing and treating arterial stenosis according to claim 7, characterized in that: It also includes a second balloon (7), which is wrapped around one end of the inner tube (14) and spaced apart from one end of the first balloon (2) away from the catheter connector (3), and one end of the second balloon (7) extends to connect and communicate with the other end of the first balloon (2).

9. The dilation injection system for preventing and treating arterial stenosis according to claim 8, characterized in that: At least two radiopaque second development marking rings (12) are provided along the long axis of the area on the surface of the catheter (1) within the coverage of the second balloon (7).

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