Drug-loaded balloon catheter

Abstract

The invention provides a medicine carrying balloon catheter, and belongs to the technical field of interventional operation medical instruments. The medicine-carrying balloon catheter comprises a catheter body, a valve seat is arranged at the near end of the catheter body, a balloon assembly is arranged at the position, close to the far end, of the catheter body, and the balloon assembly comprises an inner-layer balloon body directly arranged on the outer side wall of the catheter body and an outer-layer balloon body arranged on the outer side of the inner-layer balloon body in a sleeving mode. The inner-layer bag body and the outer-layer bag body are connected with the valve seat through different conveying channels respectively, medicine carrying grooves are distributed in the outer surface of the outer-layer bag body, and medicine slow-release particles are arranged in the medicine carrying grooves; after the balloon assembly is conveyed to a narrow position, the inner-layer balloon body is firstly filled, the inner-layer balloon body supports the outer-layer balloon body to be close to the blood vessel wall, then the outer-layer balloon body is filled, and the drug carrying groove of the outer-layer balloon body extrudes the drug sustained-release particles into the blood vessel sediment of the narrow position so as to prolong the treatment cycle; the technical problems that in the prior art, drugs are difficult to effectively act on narrow parts, and the treatment effect is poor are mainly solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices for interventional surgery, and particularly relates to a drug-coated balloon catheter. Background Art

[0002] Vascular stenosis refers to a pathological state in which the inner diameter of the blood vessel lumen becomes smaller, resulting in restricted blood flow. Once the blood vessel is stenosed, the blood supply to the corresponding organ or tissue will be reduced. Taking coronary artery stenosis as an example, it can cause insufficient myocardial blood supply, leading to angina pectoris, myocardial infarction, etc.; cerebral artery stenosis will cause insufficient cerebral blood supply, resulting in symptoms such as dizziness, headache, memory loss, and even cerebral infarction in severe cases. In addition, vascular stenosis will further cause local tissue hypoxia due to insufficient blood supply, affecting the normal metabolism and function of cells. If hypoxia persists for a long time, it will cause pathological changes such as atrophy and fibrosis of tissues and organs.

[0003] In the face of vascular stenosis, traditional surgical treatments have problems such as large trauma, high risk, and slow recovery, and patients often have to endure great pain. Against this background, interventional surgery has been widely promoted and applied due to its advantages of less trauma, high safety, and fast recovery.

[0004] The specific interventional treatment method is as follows: Insert a balloon catheter into the body through a blood vessel or cavity, and accurately place the balloon at the stenosed or blocked site under the guidance of imaging equipment (such as X-rays, ultrasound, etc.). Then, fill the balloon with liquid or gas through the catheter to expand the balloon and apply pressure to the stenosed site to dilate the stenosed lumen and restore its patency. To prevent the blood vessel from restenosing again after the balloon is withdrawn, a stent is usually placed at the stenosed site. However, as a foreign body invading the patient's body, the stent is likely to trigger a human immune response, causing excessive proliferation of blood vessel cells at the stent placement site and wrapping the stent, ultimately leading to restenosis at the treatment site in the later stage. To solve this problem, currently common methods include coating a thrombolytic drug coating on the outside of the balloon, or using a "sweating balloon".

[0005] For the method of coating a drug coating on the outside of the balloon, after the balloon is supported at the stenosed site, the balloon needs to be pushed back and forth repeatedly to smear the drug coating from the balloon to the stenosed site. However, this coating method has a large operation difficulty, and the drug coating smeared on the stenosed position is easily washed away by the blood flow, making it difficult to achieve a good treatment effect on the stenosed site. In addition, during the delivery of the balloon to the stenosed site, the drug coating is also easily scratched and peeled off, further weakening the treatment effect. As for the sweating balloon, a therapeutic drug is injected into the balloon, and the drug slowly oozes out from the balloon surface and acts on the stenosed site. Although this treatment method does not require smearing drugs, the liquid medicine oozing out from the balloon is more easily diluted by the blood flow, and it is also difficult to achieve an ideal treatment effect.

[0006] Therefore, it is necessary to provide an improved technical solution to address the deficiencies of the above-mentioned existing technologies. Summary of the Invention

[0007] The object of the present invention is to provide a drug-coated balloon catheter to solve the technical problems in the existing technology where it is difficult for drugs to effectively act on the stenosis site and the treatment effect is not good.

[0008] To achieve the above object, the drug-coated balloon catheter of the present invention provides the following technical solution:

[0009] A drug-coated balloon catheter includes a tube body. A valve seat is provided at the proximal end of the tube body, and a balloon assembly is provided at a position near the distal end of the tube body. The balloon assembly includes an inner balloon body directly disposed on the outer sidewall of the tube body and an outer balloon body sleeved outside the inner balloon body. The inner balloon body and the outer balloon body are respectively connected to the valve seat through different delivery channels. Drug-loading grooves are distributed on the outer surface of the outer balloon body, and drug sustained-release particles are provided in the drug-loading grooves. After the balloon assembly is delivered to the stenosis position, the inner balloon body is first inflated, and the inner balloon body supports the outer balloon body close to the blood vessel wall. Then the outer balloon body is inflated, and the drug-loading grooves of the outer balloon body squeeze the drug sustained-release particles into the blood vessel deposits at the stenosis site to extend the treatment cycle.

[0010] As a further optimized technical solution, the opening of the drug-loading groove is smaller than the internal width.

[0011] As a further optimized technical solution, the drug sustained-release particles are conical with a rounded top.

[0012] As a further optimized technical solution, a collection assembly is provided at the distal end of the balloon assembly for collecting the fine emboli and drug sustained-release particles that fall during the process of placing the drug sustained-release particles.

[0013] As a further optimized technical solution, the collection assembly includes support rods arranged circumferentially and evenly spaced along the outer sidewall of the tube body. One end of the support rod is hinged to the tube body, and a collection net is provided between the support rods. A driving component is arranged on the tube body near the hinged position of the support rod and the tube body for driving the support rods to expand or contract.

[0014] As a further optimized technical solution, the driving component is an annular balloon. The outer sidewall of the annular balloon is fixedly connected to the support rod. When the annular balloon is inflated, all the support rods expand to be clamped in the blood vessel. When the annular balloon is contracted, the support rods contract and fit against the outer sidewall of the tube body.

[0015] As a further optimized technical solution, the annular balloon is communicated with the inner balloon body or the outer balloon body.

[0016] As a further optimized technical solution, a storage groove is arranged on the tube body, and the collection assembly is arranged in the storage groove.

[0017] As a further optimized technical solution, a flow diversion pipeline is arranged inside the tube body. The proximal end of the flow diversion pipeline is arranged at the proximal end of the balloon assembly and communicates with the outside of the tube body, and the distal end extends to at least be flush with the distal end of the tube body.

[0018] As a further optimized technical solution, a radiopaque ring is arranged at the distal end of the tube body.

[0019] Beneficial effects:

[0020] Firstly, the inner bladder is filled and positioned, and then the outer bladder expands. Since the wall thickness of the outer bladder at the position of the drug-loading groove is thinner than that at other positions, during the process of filling the outer bladder, the bottom position of the drug-loading groove is most likely to deform outward, pushing the drug sustained-release particles in the drug-loading groove into the thrombus at the stenosis position. By this way of drug delivery, the disadvantages that the traditional drug-coated balloon is vulnerable to blood flow scouring and the coating is easily damaged and peeled off during transportation are completely eliminated. Moreover, the drug sustained-release particles are firmly fixed at the stenosis site under the pushing action of the drug-loading groove, greatly increasing the drug delivery density at the lesion site, ensuring that the drug can exert a therapeutic effect for a long time and stably, significantly prolonging the treatment cycle, and effectively improving the treatment effect.

[0021] Furthermore, the collection assembly of the present invention, with the support rods arranged circumferentially and uniformly and the fine collection net, can be expanded to form a protective net under the flexible control of the driving component (such as an annular balloon), timely collect potential threat substances, and effectively reduce the occurrence probability of complications such as blood vessel embolism during the operation, comprehensively ensuring the surgical safety of patients.

[0022] Furthermore, by arranging the flow diversion pipeline, the blood flow can be timely guided to circulate through the flow diversion pipeline, and the treatment can be carried out without terminating the blood circulation, effectively avoiding excessive interference of the surgical operation on the blood flow. Therefore, the impact on the patient is effectively reduced, and the smooth progress of the operation is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0024] Figure 1 is a schematic diagram of the overall structure of an embodiment of the drug-loading balloon catheter of the present invention;

[0025] Figure 2 is a schematic diagram of the distal end structure of the tube body of an embodiment of the drug-loading balloon catheter of the present invention;

[0026] Figure 3 is a schematic diagram of the structure of the balloon assembly of an embodiment of the drug-loading balloon catheter of the present invention;

[0027] Figure 4 Schematic diagram of the drug - containing groove structure of one embodiment of the drug - loaded balloon catheter of the present invention;

[0028] Figure 5 Schematic diagram of the collection assembly structure of one embodiment of the drug - loaded balloon catheter of the present invention;

[0029] Figure 6 Schematic diagram of the working state of one embodiment of the drug - loaded balloon catheter of the present invention.

[0030] In the figure: 1. Tube body; 101. Storage groove; 102. Flow - diversion pipeline; 103. First delivery channel; 104. Second delivery channel; 105. Third delivery channel; 2. Valve seat; 3. Balloon assembly; 301. Inner balloon; 302. Outer balloon; 303. Drug - containing groove; 4. Drug - releasing particles; 5. Vessel wall; 6. Vascular deposits; 7. Collection assembly; 701. Support rod; 702. Collection net; 703. Driving component; 8. Marking ring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0032] In the description of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms can be understood according to specific situations. In addition, the term "proximal" uniformly refers to the end close to the operator, and "distal" refers to the end far from the operator.

[0033] Next, the present invention will be described in detail with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0034] It should be noted that the shapes and sizes of the components in the drawings do not reflect the actual proportions of the products, and the purpose is only to schematically illustrate the content of the present invention.

[0035] The present invention provides a drug - loaded balloon catheter, aiming to solve the technical problems of drug delivery and efficacy guarantee in the field of current vascular stenosis interventional treatment. The core inventive point is the design of the balloon assembly. The inner balloon is used to deform uniformly to support the outer balloon to contact the stenosis site in the blood vessel, and then the medium is refilled into the outer balloon to fully inflate the outer balloon. Since the drug - loaded grooves are provided on the outer balloon, the overall wall thickness of the outer balloon is not uniform. During the inflation process of the outer balloon, the position of the drug - loaded groove has a thinner wall thickness, so it is easier to deform outward, and thus the internal drug - releasing particles can be pushed and fixed into the blood vessel deposits. Compared with the existing drug - coating application and slow drug penetration, the treatment cycle is long, and the treatment effect is better.

[0036] Example 1

[0037] As Figure 1 shown, the drug - loaded balloon catheter includes a tube body 1, a valve seat 2, and a balloon assembly 3.

[0038] The valve seat 2 is installed at the proximal end of the tube body 1. The valve seat 2 is mainly used to ensure the quick connection between the tube body 1 and various external medical devices. The balloon assembly 3 is arranged at a position near the distal end of the tube body 1. As Figure 2 shown, the balloon assembly 3 includes an inner balloon 301 directly fixedly connected to the outer side wall of the tube body 1 at both ends and an outer balloon 302 sleeved outside the inner balloon 301. The space defined by the inner side wall of the inner balloon 301 and the outer side wall of the tube body 1 forms the inflation space of the inner balloon 301. The space between the inner side wall of the outer balloon 302 and the outer side wall of the inner balloon 301 forms the inflation space of the outer balloon 302. Both the inner balloon 301 and the outer balloon 302 are made of high - strength and high - flexibility medical - grade silicone materials, which can ensure gentle contact with the blood vessel wall 5 while withstanding a large inflation pressure and avoid damaging the vascular intima. Among them, the inner balloon 301 is connected to the valve seat 2 through the first delivery channel 103, and the outer balloon 302 is connected to the valve seat 2 through the second delivery channel 104. In this way, the outer balloon 302 and the inner balloon 301 can be separately communicated through the branch passages on the valve seat 2 to realize the independent control of the outer balloon 302 and the inner balloon 301.

[0039] As Figure 3 、 Figure 4As shown, the wall thickness of the inner layer capsule 301 is uniform, and the outer surface of the outer layer capsule 302 is provided with uniformly distributed drug loading grooves 303. Due to the provision of the drug loading grooves 303, the wall thickness of the outer layer capsule 302 is uneven, especially the wall thickness at the position of the drug loading grooves 303 is thinner, and drug sustained-release particles 4 are arranged inside the drug loading grooves 303. Such a design has two advantages. First, during the transportation process, the drug sustained-release particles 4 are not yet filled because the outer layer capsule 302 has not yet been filled, and the volume of the drug loading grooves 303 is small, so that the drug sustained-release particles 4 are conveniently stored in the drug loading grooves 303. Compared with being coated on the outside of the balloon, it is not easy to be worn and fall off, which can ensure the delivery of therapeutic drugs with guaranteed quality and quantity. Second, the special structure of the drug loading grooves 303 makes it easier for the bottom to bulge outward during the later filling process of the outer layer capsule 302, thereby squeezing the internal drug sustained-release particles 4 into the vascular deposits 6 (i.e., thrombus), ensuring the firmness and stability of the placement of the drug sustained-release particles 4.

[0040] Specifically during treatment, after the balloon assembly 3 is delivered to the stenotic site in the blood vessel, the inner layer balloon 301 is first filled, and the inner layer balloon 301 is uniformly deformed to support the outer layer balloon 302 close to the blood vessel wall 5, and then the outer layer balloon 302 is filled, and the drug loading groove 303 of the outer layer balloon 302 squeezes the drug sustained-release particles 4 into the vascular deposits 6 at the stenotic site to extend the treatment period.

[0041] like Figure 4 As shown, the opening of the drug loading slot 303 is smaller than the internal width, so that the opening of the drug loading slot 303 is contracted, forming a structure similar to a "barb", which effectively prevents the drug sustained-release particles 4 from accidentally falling off due to vibration, friction and other factors during transportation. The drug sustained-release particles 4 are designed to be a cone with rounded corners on the top. This shape is not only convenient for embedding into the vascular deposits 6, but also can anchor the vascular deposits 6 pushed and deformed by the balloon assembly 3, preventing the balloon catheter from withdrawing the vascular deposits 6 and rebounding and deforming again to block the blood vessels. After the drug sustained-release particles 4 are fixed in the vascular deposits 6, the thrombolytic drugs are slowly released, and the vascular deposits 6 are gradually dissolved, thereby effectively treating the stenosis of the blood vessels. In addition, the rounded top design of the drug sustained-release particles 4 can also reduce the mechanical damage to the vascular wall 5 during the pushing process.

[0042] like Figure 1 , Figure 5 As shown, a collecting assembly 7 is provided at the distal end of the balloon assembly 3 for collecting tiny emboli and the drug sustained-release particles 4 that fall during the placement of the drug sustained-release particles 4 .

[0043] Specifically, the collection assembly 7 includes a support rod 701 and a collection net 702. The support rods 701 are circumferentially and evenly spaced along the outer wall of the tube body 1, and one end of each support rod 701 is hinged to the tube body 1. The collection net 702 is disposed between any two adjacent support rods 701. A driving member 703 is arranged on the tube body 1 near the hinged position of the support rod 701 and the tube body 1 for driving the support rod 701 to expand or contract.

[0044] In this embodiment, the driving member 703 is an annular balloon arranged outside the tube body 1. Both ends of the balloon body of the annular balloon are fixedly connected to the tube body 1, and the interior is communicated with an external filling device. The distal end of the outer wall of the annular balloon is fixedly connected to the support rod 701. In this way, when the annular balloon is filled, the filled annular balloon will drive all the support rods 701 to expand and be clamped in the blood vessel, thus facilitating the collection operation. After the operation is completed, the annular balloon is contracted. The annular balloon fits against the outer wall of the tube body 1, and at the same time, the contracted annular balloon pulls the support rod 701 to rotate towards the side close to the tube body 1 until it fits against the outer wall of the tube body 1 to complete the contraction of the collection assembly 7.

[0045] Specifically, the annular balloon can be connected to an external filling device through an independently arranged delivery channel, or can be communicated with the inner bladder 301 or the outer bladder 302 through the third delivery channel 105. When connected to an external filling device through a separately arranged delivery channel, independent control of the collection assembly 7 can be achieved. When communicated with the inner bladder 301 or the outer bladder 302 through the third delivery channel 105, in actual operation, the same external filling device can be used to perform fluid control on the inner bladder 301 or the outer bladder 302 and the annular balloon. For example, through the operation of the valve seat 2, while injecting normal saline into the inner bladder 301 or the outer bladder 302 to make it expand and position, the annular balloon can be filled or contracted synchronously by using the internal pressure change of the inner bladder 301 or the outer bladder 302 through the third delivery channel 105. There is no need to additionally connect complex pipelines for the annular balloon, greatly reducing the number of external pipelines and making the connection of the entire device more concise.

[0046] Further, in order to ensure that the collection assembly 7 can be stored in a non-use state without affecting the overall shape and deliverability of the balloon catheter, a storage groove 101 is specially provided on the tube body 1, and the collection assembly 7 is arranged in the storage groove 101.

[0047] Further, in order to ensure continuous and stable maintenance of blood circulation during the operation of drug administration and reduce the risk of local ischemia caused by blood vessel blockage, a diversion pipeline 102 is arranged in the tube body 1. The proximal end of the diversion pipeline 102 is arranged at the proximal end of the balloon assembly 3 and communicated with the outside of the tube body 1, and the distal end extends to be flush with the distal end of the tube body 1 or beyond the distal end of the tube body 1.

[0048] Furthermore, in order to achieve clear imaging under imaging devices such as X-rays and ultrasounds, provide precise catheter position information for doctors, and ensure the accuracy and safety of surgical operations, a radiopaque ring 8 is provided at the distal end of the tube body 1.

[0049] In actual clinical application scenarios, the use of the drug-loaded balloon catheter of the present invention must strictly follow the following operation procedures. First, in a sterile environment, accurately connect and debug the drug-loaded balloon catheter with the corresponding external drive device, drug delivery device, and imaging guidance device. After ensuring that the signal transmission and fluid delivery between the devices are in normal conditions, through the patient's peripheral blood vessels (such as femoral artery, radial artery, etc.), using the guide wire guiding technique, slowly and smoothly insert the drug-loaded balloon catheter into the blood vessel. During the entire insertion process, continuously monitor the position and direction of the catheter in real time with the help of imaging devices (such as X-ray angiography machine, ultrasound diagnostic instrument, etc.) to ensure that the catheter smoothly reaches the blood vessel stenosis site along the predetermined path.

[0050] When the balloon assembly 3 reaches the target position, the doctor starts the filling procedure of the inner bladder 301 by operating the control knob on the valve seat 2. Inject an appropriate amount of sterile normal saline or contrast agent into the inner bladder 301 through the first delivery channel 103. As the liquid is injected, the inner bladder 301 gradually expands evenly. Due to the high flexibility and conforming design of its material, the inner bladder 301 can evenly support the outer bladder 302 close to the blood vessel wall 5 while avoiding excessive squeezing and damage to the blood vessel wall 5. During this process, closely observe the images feedback by the imaging device to ensure that the position and expansion degree of the inner bladder 301 meet the surgical expectations.

[0051] After the inner bladder 301 is filled, the filling operation of the outer bladder 302 is immediately started. An appropriate amount of expansion medium is injected into the filling space of the outer bladder 302 through the second delivery channel 104. Due to the special thin-wall design of the drug carrier groove 303 area, the bottom of the drug carrier groove 303 bulges outwards first under the action of the filling pressure. The extrusion force generated by this deformation can push the drug sustained-release particles 4 in the drug carrier groove 303 into the vascular deposits 6 in the narrow part. During the pushing process of the drug sustained-release particles 4, the uniformity and depth of drug release need to be closely observed to ensure that the drug can fully penetrate into the diseased tissue. When filling the inner bladder 301 or the outer bladder 302, an appropriate amount of fluid is simultaneously injected into the annular balloon (driving component 703). As the annular balloon is filled, the annular balloon driving support rod 701 expands, and the collection net 702 unfolds and is clamped in the blood vessel to form an interception barrier. The mesh size of the collection net 702 is pre-designed to effectively capture various micro-particles while ensuring that the normal blood flow rate is not affected. When the operation is completed, through reverse operation, the fluid in the annular balloon is discharged, the support rod 701 contracts, and the captured substances are cached in the collection net 702 until the support rod 701 fits against the outer wall of the tube body 1, and the collection assembly 7 is received into the receiving groove 101. During the entire balloon catheter operation, the diversion pipeline 102 continuously plays a role. Driven by physiological pressure, blood naturally flows into the proximal opening of the diversion pipeline 102, bypasses the balloon operation area through the guidance of the diversion pipeline 102 inside the pipeline, and re-enters the main blood vessel path from the distal opening of the diversion pipeline 102. During this process, the patient's vital signs and hemodynamic parameters are closely monitored to ensure the stability and normality of blood circulation. At the same time, the doctor can accurately master the precise position of the balloon catheter in the blood vessel by observing the position of the imaging ring 8 on the imaging device, providing an accurate positioning basis for the surgical operation.

[0052] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A drug-loaded balloon catheter, characterized in that, The invention comprises a tube body (1), wherein a valve seat (2) is arranged at the proximal end of the tube body (1), and a balloon assembly (3) is arranged near the distal end of the tube body (1), wherein the balloon assembly (3) comprises an inner layer balloon body (301) directly arranged on the outer side wall of the tube body (1) and an outer layer balloon body (302) sleeved on the outer side of the inner layer balloon body (301), wherein the inner layer balloon body (301) and the outer layer balloon body (302) are connected to the valve seat (2) via different delivery channels, respectively, and the outer surface of the outer layer balloon body (302) A drug loading groove (303) is distributed on the upper surface, and drug sustained-release particles (4) are arranged in the drug loading groove (303); after the balloon assembly (3) is transported to the stenotic position, the inner layer capsule (301) is first filled, and the inner layer capsule (301) supports the outer layer capsule (302) to be close to the blood vessel wall (5), and then the outer layer capsule (302) is filled, and the drug loading groove (303) of the outer layer capsule (302) squeezes the drug sustained-release particles (4) into the blood vessel deposits (6) at the stenotic position to extend the treatment period.

2. The drug-loaded balloon catheter according to claim 1, characterized in that, The opening of the drug loading slot (303) is smaller than the inner width.

3. The drug-loaded balloon catheter according to claim 1, characterized in that, The drug sustained-release particles (4) are in the shape of a cone with a rounded top.

4. The drug-loaded balloon catheter according to claim 1, wherein, The distal end of the balloon assembly (3) is provided with a collecting assembly (7) for collecting tiny emboli and the drug sustained-release particles (4) that fall during the placement of the drug sustained-release particles (4).

5. The drug-loaded balloon catheter according to claim 4, characterized in that, The collecting assembly (7) comprises support rods (701) uniformly arranged at circumferential intervals along the outer wall of the tube body (1); one end of the support rods (701) is hinged to the tube body (1); a collecting net (702) is arranged between the support rods (701); and a driving component (703) is arranged on the tube body (1) near the hinge position between the support rods (701) and the tube body (1) for driving the support rods (701) to expand or contract.

6. The drug-loaded balloon catheter according to claim 5, characterized in that, The driving component (703) is an annular balloon, the outer wall of which is fixedly connected to the support rod (701). When the annular balloon is filled, all the support rods (701) are expanded to be stuck in the blood vessel, and when the annular balloon is contracted, the support rods (701) contract to fit the outer wall of the tube body (1).

7. The drug-loaded balloon catheter according to claim 6, characterized in that, The annular balloon is connected to the inner layer balloon (301) or the outer layer balloon (302).

8. The drug-loaded balloon catheter according to claim 5, wherein, The tube body (1) is provided with a receiving groove (101), and the collecting assembly (7) is arranged in the receiving groove (101).

9. The drug-loaded balloon catheter according to any one of claims 1-8, characterized in that, A flow-redirecting conduit (102) is arranged in the tube body (1); the proximal end of the flow-redirecting conduit (102) is arranged at the proximal end of the balloon assembly (3) and communicates with the outside of the tube body (1), and the distal end extends to at least be flush with the distal end of the tube body (1).

10. The drug-loaded balloon catheter according to any one of claims 1-8, characterized in that, A developing ring (8) is provided at the distal end of the tube body (1).

Images