Opening catheter for restenosis or occlusion in peripheral vascular stent

Abstract

The invention discloses a peripheral intravascular stent restenosis or occlusion opening catheter, and relates to the technical field of medical instruments, blood vessel foreign body forceps and operating handles, the catheter of the blood vessel foreign body forceps is an adjustable bent catheter, a through hole is formed in the forceps head end of the blood vessel foreign body forceps, a guide wire penetrates through the through hole, teeth are oppositely arranged on the forceps head of the forceps head end, and the operating handles are arranged on the teeth. And the operating handle can control the bending degree of the adjustable bending catheter and the opening and closing of the forceps head. According to the intravascular reocclusion opening system in the stent, the rotating angle of the front-end forceps head can be adjusted and controlled through the guide wire, restenosis contents (hyperplasia endometrium and calcified plaques) in the stent can be occluded, and the purpose of safely opening the intravascular restenosis and completely occluded blood vessels in the stent is achieved by combining the guide wire penetrating through the middle of the system; the problem of in-stent restenosis caused by intracavity treatment is solved in a minimally invasive mode, and surgical vascular bypass is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a catheter for opening restenosis or occlusion in a peripheral blood vessel stent. Background Art

[0002] Endovascular treatment has become the primary treatment for arteriosclerosis obliterans (ASO) of the lower extremities. Stent implantation is a minimally invasive surgical method for dilating and opening narrowed and occluded diseased blood vessels. This procedure has the advantages of less trauma, lower risk and fewer complications, and has become one of the standard interventional treatments for arteriosclerosis obliterans of the lower extremities. However, the problem of in-stent restenosis (ISR) caused by endovascular treatment has become increasingly prominent, especially in the superficial femoral artery (SFA) segment under the action of various anatomical mechanics. ISR is extremely common in clinical practice. It is reported that the restenosis rate of this part is as high as 23% to 36% one year after stent implantation. Internationally, the reduction of the effective lumen in the stent and the 5mm interval near and distal to the stent caused by thrombosis and intimal hyperplasia after stent angioplasty of lower extremity arteries is called in-stent restenosis (ISR).

[0003] At present, the diagnosis of ISR is very clear. During angiography, if the stenosis of the lumen in the stent area or adjacent to the proximal and distal ends of the stent is greater than 50%, ISR can be considered to have occurred. Mehran systematically described the morphological characteristics of in-stent stenosis and divided it into four grades from I to IV according to the range of lesions. The main forms are focal, diffuse, proliferative and occlusive. SFA is a muscular blood vessel. The inflammatory reaction and remodeling of the vessel wall caused by exogenous stent implantation are more prominent. As the longest artery in the lower limb, it is subjected to multi-dimensional external forces such as stretching, twisting and muscle pressure caused by joint flexion and extension. These factors directly affect the long-term patency of SFA stent implantation. After stent implantation, its supporting role may cause separation of the intima and media of the blood vessel, causing damage to the vascular wall, exposing the collagen and lipid core under the intima. These components can activate platelets and release inflammatory mediators such as growth factors. These growth factors and other inflammatory mediators can further stimulate smooth muscle and fibroblasts to migrate to the injured area and cause restenosis. The lesions are composed of sclerotic tissue, hyperplastic intima, thrombus and dense smooth muscle cells with strong elastic recoil force.

[0004] With the development of endovascular technology and the deepening of the concept of not leaving any implants in blood vessels, endovascular volume reduction technology has gradually been applied to lower limb arteriosclerosis obliterans and has become a hot topic of research. Volume reduction devices mainly reduce the load of endovascular treatment and expand the lumen capacity by removing plaques, thrombi, hyperplastic intimal and other substances in the blood vessels. Different volume reduction technologies achieve the purpose of vascular volume reduction through different principles. Currently, vascular volume reduction devices mainly include directional and non-directional types. The directional types mainly include SilverHawk and TurboHawk plaque rotary excision systems, while the non-directional types mainly include Rotarex mechanical thrombectomy device (arteriovenous rotary excision + embolus aspiration), Angiojet (venous embolus aspiration) thrombus removal device, Jetstream vascular plaque rotary excision system (rotational excision + embolus aspiration is not available in China), and laser ablation. Excimer laser ablation 200w (ELA) and directional plaque rotary excision technology are widely used in lower limb arteriosclerosis obliterans.

[0005] At present, the commonly used plaque rotary excision systems are mainly SliverHawk and TurboHawk. The SliverHawk plaque rotary excision system consists of a cutting catheter part and a driving part. The end of the catheter is a conical plaque collection chamber, and the rotating cutting blade is located in the chamber. The end of the collection chamber is a cutting window. When the blade is exposed and working, the collection chamber forms an angle with the catheter. The cutting window is located at its apex, and the blade is pushed to the other side of the tube wall so that it is in full contact with the plaque. The proximal end includes a direction adjuster, an angle adjuster, and a joint with the driving handle. The TurboHawk plaque rotary excision system is a new type of rotary excision system after SliverHawk. The difference is that the number of cutting blades and the cutting speed are stronger than the SliverHawk plaque rotary excision system. Although the plaque rotary excision device can be used to remove the proliferating tissue in the stent, this device has not been approved for the treatment of ISR. The rotary excision blade may hook into the stent, damage the diseased blood vessel, or cause damage to the device, or even make it impossible to remove it. More importantly, whether it is the SilverHawk plaque excision system or the TurboHawk plaque excision system, the prerequisite for its normal operation must be that the guidewire has successfully passed through the narrow blood vessel to provide guidance, support and guidance for the plaque excision system. The plaque excision system cannot be used for completely occluded blood vessels where the guidewire cannot pass.

[0006] Rotarex's rotary cutting system contains a rotating head driven by a rotating spiral. The rotating head is composed of two overlapping metal cylinders with a pair of side openings. The outer cylinder is connected to the rotating spiral, and the inner cylinder is connected to the catheter shaft. The front end of the rotating outer cylinder is equipped with multiple cutting surfaces to form a spiral structure to grind the embolic material in front. The principle is to rely on the Archimedean spiral to transmit the crushed material; the two oval holes at the head end cut the diseased tissue.

[0007] Rotarex has a better effect on reducing the volume of fresh thrombi. Old thrombi are usually harder and may not be completely reduced, causing residual thrombi to fall off distally and embolize distal arteries. Preoperative non-invasive vascular imaging technology (computerized tomography angiography, CTA) indicates that the occluded lumen is a low-density lesion, which can be considered acute or subacute thrombotic occlusion. It is easier for the guidewire catheter to pass through the lesion during the operation. Considering that the lesion lumen is mostly composed of thrombi, the use of Rotarex for volume reduction can remove the organized thrombi and scattered plaques in the blood vessels. At the same time, negative pressure is generated by high-speed rotation, and the embolic materials in the vascular lumen are crushed and sucked out by the side hole at the catheter head. However, most of the ISR lesions are plaques and are relatively hard. Rotarex is not effective in cutting calcified plaques, and there is a risk of arterial wall damage, arterial perforation and rupture. Due to the limitation of diameter, Rotarex cannot be used in branches beyond the popliteal artery. The prerequisite for the operation of the Rotarex system is that the guidewire can pass through the narrowed blood vessels smoothly and ensure that the lumen passed through is the true lumen. The Rotarex system cannot be used for completely occluded blood vessels where the guidewire cannot pass.

[0008] The AngioJet system includes a console and a matching catheter, the latter of which is a disposable consumable. When performing thrombus removal, the catheter component pump is placed in the pump cabinet of the console, and the catheter saline pipeline is connected to sterile heparin saline. The saline is delivered to the catheter at high speed through the pressurization of the pump, and a negative pressure is generated inside the catheter head according to the Bernoulli principle. The thrombus is sucked in through the inflow hole of the catheter at the corresponding position, and the thrombus is broken up inside the catheter and flows into the waste liquid bag with the water. In addition to the suction function, some models of catheters also have the function of spraying thrombolytic drugs and softening thrombi. The AngioJet mechanical thrombus removal system is used to treat acute deep vein thrombosis of the lower extremities.

[0009] The JetStream atherectomy catheter is a device that combines atherectomy and thrombus aspiration, and has a volume reduction effect on fresh thrombi, old thrombi, and sclerotic plaques. However, due to the risk of arterial rupture, it is not suitable for visceral arteries, iliac arteries, and severe eccentric lesions. The JetStream atherectomy system has not yet entered the domestic market, and the operating prerequisite must be that the guidewire can pass smoothly through the narrowed blood vessels and ensure that the lumen passed is the true lumen. The JetStream system cannot be used for completely occluded blood vessels where the guidewire cannot pass.

[0010] ELA is a treatment strategy that uses the energy of excimer laser to ablate atherosclerotic plaques in arteries, thereby eliminating plaques and reducing their volume. The main mechanism of ISR is intimal hyperplasia, and ELA can ablate 60% of hyperplastic tissue. The excimer laser ablation device includes an excimer laser emission system and a TurboHawk laser catheter, which ablate plaques through the action of powerful discrete pulses. The main working principles of ELA are: (1) Photochemical action: plaque molecular bonds absorb laser energy and break and decompose; (2) Photothermal effect: evaporation of water inside cells to produce small bubbles, causing damage and vaporization of cell membranes; (3) Photomechanical action: bubble expansion and rupture causes cell tissue tearing and mechanical decomposition of adjacent tissues. The above three aspects are collectively referred to as photoablation. These processes ultimately cause atherosclerotic plaques to become tiny fragments, CO2 and vaporized water, changing the morphology of plaques and hard tissues on the surface under the calcified membrane to facilitate later treatment. ELA fragments plaques through photoablation without causing thermal damage. The laser catheter is coaxially designed and guided forward by a guidewire. However, ELA is complicated to operate, has a high learning curve, is expensive, and has many postoperative complications. The laser may cause the absorbed energy to exceed the expected amount, causing pain to the patient, increasing the risk of dissection or perforation, and excimer laser ablation is not effective for severe calcified lesions. The operation premise must be that the guidewire can pass smoothly through the narrowed blood vessel and ensure that the lumen passed through is the true lumen. The ELA system cannot be used for completely occluded blood vessels where the guidewire cannot pass.

[0011] The prerequisite for the application of the above-mentioned systems is that the guidewire can smoothly pass through the lumen of the diseased blood vessel being operated on and ensure that the lumen passed through is the true lumen of the blood vessel. However, they cannot be used for completely occluded blood vessels where the guidewire cannot pass. Summary of the invention

[0012] The purpose of the present invention is to provide a catheter for opening restenosis or occlusion in peripheral vascular stents to solve the problems existing in the above-mentioned prior art, so that the hyperplastic vascular endothelium and hard calcified plaques can be removed from the blood vessels that are completely occluded in the stents and the blood vessels where the guide wire cannot pass.

[0013] To achieve the above object, the present invention provides the following solutions:

[0014] The present invention provides a catheter for opening restenosis or occlusion in a peripheral vascular stent, comprising a vascular foreign body forceps and an operating handle. The catheter of the vascular foreign body forceps is an adjustable curved catheter. A through hole is provided at the clamp head end of the vascular foreign body forceps, and the through hole is used to pass a guide wire. Teeth are relatively arranged on the clamp head of the clamp head end. The operating handle can control the bending degree of the adjustable curved catheter and the opening and closing of the clamp head.

[0015] Preferably, the pliers head includes pliers blades, a fixed head and a connecting rod. The fixed head is a hollow structure and has a U-shaped groove at the front end and a rear end connected to the end of the adjustable bend guide tube. The middle parts of the two pliers blades are hinged to the outer port of the fixed head. The outer ends of the two pliers blades are relatively provided with the teeth, and the inner ends are respectively hinged to one end of the connecting rod. The other ends of the two connecting rods are hinged by a pin shaft. The inner ends of the pliers blades and the connecting rod form a quadrilateral connecting rod mechanism, and the pin shaft is connected to the pliers head pull ring of the operating handle through a traction wire.

[0016] Preferably, the through hole is provided on the front end of the pliers blade and the hinge shaft, and the pliers head is made of stainless steel.

[0017] Preferably, one end of the control wire of the adjustable bend catheter is connected to the bend adjusting head, and the other end is connected to the bend adjusting component of the operating handle.

[0018] Preferably, the diameter of the adjustable bend conduit is 2mm-5mm, the material of the adjustable bend conduit is fluorinated ethylene propylene copolymer, the surface of the adjustable bend conduit is coated with a hydrophilic coating, and the inner layer is coated with bismuth oxide developer; the control wire is passed through a threading tube on the side wall of the adjustable bend conduit.

[0019] Preferably, the operating handle includes a bending adjustment assembly, a gripping rod and a pliers head pull ring, the hollow cavity of the gripping rod is connected to the adjustable bending conduit, the front end of the gripping rod is connected to the adjustable bending conduit, the bending adjustment assembly is slidably arranged in the middle part, and the pliers head pull ring is slidably arranged at the rear end.

[0020] Preferably, the bending adjustment assembly includes a slider and a sliding sleeve, a waist-shaped hole is provided in the middle of the holding rod, the guide wire passes through the waist-shaped hole into the adjustable bending guide tube, the slider is slidably arranged in the waist-shaped hole and the two ends of the slider are clamped in the annular groove in the sliding sleeve, the end of the control wire of the adjustable bending guide tube is connected to the middle of the slider, and the sliding sleeve is slidably arranged in the middle of the holding rod.

[0021] Preferably, a plurality of arcuate ridges are arranged at intervals along the axial direction in the middle of the gripping rod, an arcuate clamping strip is arranged on the inner side of the sliding sleeve, the central angles of the clamping strip and the arcuate ridge are both less than 180°, and the clamping strip can be clamped on each of the arcuate ridges respectively.

[0022] Preferably, the diameter of the guide wire is 0.1 mm-1 mm, and the diameter of the through hole is 0.2 mm-1 mm.

[0023] Preferably, the operating handle is made of plastic.

[0024] Compared with the prior art, the present invention has achieved the following technical effects:

[0025] The in-stent restenosis intravascular opening system of the present invention can adjust the rotation angle of the front clamp head through the guide wire, engage the restenosis contents (hyperplastic vascular endothelium, calcified plaque) in the stent, and combine with the guide wire passing through the middle of the system to achieve the purpose of safely opening the restenosis and completely occluded blood vessels in the stent, and minimally invasively solve the problem of in-stent restenosis caused by intracavitary treatment, avoiding surgical vascular bypass. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the appearance of a catheter for clearing restenosis or occlusion in a peripheral vascular stent according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the use structure of a catheter for opening restenosis or occlusion in a peripheral vascular stent according to an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of a catheter for opening restenosis or occlusion in a peripheral vascular stent according to an embodiment of the present invention;

[0030] Figure 4 For the present invention Figure 3 Schematic diagram of the structure of AA;

[0031] Figure 5 For the present invention Figure 3 Schematic diagram of the structure of the medium BB;

[0032] Figure 6 A schematic diagram of the structural connection relationship of the operating handle in an embodiment of the present invention;

[0033] In the figure: 1-adjustable curved catheter, 2-guide wire, 3-clamp head, 4-clamp blade, 5-fixed head, 6-connecting rod, 7-traction wire, 8-operating handle, 9-clamp head pull ring, 10-through hole, 11-control wire, 12-holding rod, 13-sliding block, 14-sliding sleeve, 15-ring groove, 16-arc convex strip, 17-clamping strip, 18-waist-shaped hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The purpose of the present invention is to provide a catheter for opening restenosis or occlusion in peripheral vascular stents to solve the problems existing in the prior art and to remove the hyperplastic vascular endothelium and hard calcified plaques in the blood vessels that are completely occluded in the stents and in the blood vessels where the guide wire cannot pass.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 6 As shown, in this embodiment, a catheter for opening restenosis or occlusion in a peripheral vascular stent is provided, including a vascular foreign body forceps and an operating handle 8. The catheter of the vascular foreign body forceps is an adjustable curved catheter 1. A through hole 10 is provided at the end of the clamp head 3 of the vascular foreign body forceps. The through hole 10 is used to pass a guide wire 2. Teeth are relatively provided on the clamp head 3 at the end of the clamp head 3. The operating handle 8 can control the bending degree of the adjustable curved catheter 1 and the opening and closing of the clamp head 3.

[0038] As an optional solution, the pliers head 3 in this embodiment includes a pliers blade 4, a fixed head 5 and a connecting rod 6. The fixed head 5 is a hollow structure and has a U-shaped groove at the front end and a rear end connected to the end of the adjustable curved catheter 1. The middle parts of the two pliers blades 4 are hinged to the outer port of the fixed head 5. The outer ends of the two pliers blades 4 are provided with teeth opposite to each other, and the inner ends are respectively hinged to one end of the connecting rod 6. The other ends of the two connecting rods 6 are hinged by a pin shaft. The inner ends of the pliers blades 4 and the connecting rod 6 form a quadrilateral connecting rod 6 mechanism. The pin shaft is connected to the pliers head 3 pull ring of the operating handle 8 through a traction wire 7. Among them, the front end of the pliers head 3 is arc-shaped.

[0039] As an optional solution, in this embodiment, a through hole 10 is provided on the front end of the pliers blade 4 and the hinge shaft, and the material of the pliers head 3 is stainless steel.

[0040] As an optional solution, in this embodiment, one end of the control wire 11 of the adjustable bend catheter 1 is connected to the bend adjusting head, and the other end is connected to the bend adjusting component of the operating handle 8.

[0041] As an optional solution, in this embodiment, the diameter of the adjustable bend conduit 1 is 2mm-5mm, preferably 2.22mm. The material of the adjustable bend conduit 1 is fluorinated ethylene propylene copolymer. The surface of the adjustable bend conduit 1 is coated with a hydrophilic coating and the inner layer is coated with bismuth oxide developer; the control wire 11 is passed through the threading tube on the side wall of the adjustable bend conduit 1.

[0042] As an optional solution, the operating handle 8 in this embodiment includes a bending adjustment component, a gripping rod 12 and a pull ring of the pliers head 3. The hollow cavity of the gripping rod 12 is connected to the adjustable bending guide tube 1. The front end of the gripping rod 12 is connected to the adjustable bending guide tube 1, the middle part is slidably provided with a bending adjustment component, and the rear end is slidably provided with a pull ring of the pliers head 3.

[0043] As an optional solution, the bending adjustment component in this embodiment includes a slider 13 and a sleeve 14. A waist-shaped hole 18 is provided in the middle of the holding rod 12. The guide wire 2 passes through the waist-shaped hole 18 into the adjustable bending catheter 1. The slider 13 is slidably arranged in the waist-shaped hole 18 and the two ends of the slider 13 are clamped in the annular groove 15 in the sleeve 14. The end of the control wire 11 of the adjustable bending catheter 1 is connected to the middle of the slider 13. The sleeve 14 is slidably sleeved in the middle of the holding rod 12. The sliding of the sleeve 14 drives the slider 13 to slide, thereby realizing the control wire 11 of the adjustable bending catheter 1 pulling the bending adjustment head to swing and bend.

[0044] As an optional solution, in the present embodiment, a plurality of arcuate ridges 16 are arranged at intervals along the axial direction in the middle of the holding rod 12, and an arcuate clamping strip 17 is arranged on the inner side of the sliding sleeve 14. The central angles of the clamping strip 17 and the arcuate ridge 16 are both less than 180°. The clamping strip 17 can be respectively clamped on each arcuate ridge 16, and the gear selection can be performed, thereby adjusting the bending degree of the adjustable bending conduit 1.

[0045] As an optional solution, in this embodiment, the diameter of the guide wire 2 is 0.1 mm-1 mm, preferably 0.889 mm; the diameter of the through hole 10 is 0.2 mm-1 mm, preferably 0.9 mm, to facilitate the passage of the guide wire 2.

[0046] As an optional solution, the operating handle 8 in this embodiment is made of plastic.

[0047] The catheter for opening restenosis in peripheral vascular stents of this embodiment can operate on completely occluded blood vessels in the stent and blood vessels through which the guidewire 2 cannot pass. The guidewire 2 runs through the entire adjustable curved catheter 1 and the clamp head 3 to guide the direction; the opening and closing of the clamp head 3 can bite and open the contents of restenosis in the stent (including hyperplastic vascular intima and calcified plaques); the tooth structure of the clamp head 3 at the front end of the system can remove the hyperplastic vascular intima and hard calcified plaques; the front end of the adjustable curved catheter 1 can adjust the direction of the clamp head 3, and the front end of the clamp head 3 is arc-shaped to avoid damage to the stent.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A catheter for opening restenosis or occlusion in a peripheral vascular stent, characterized in that: The invention comprises a vascular foreign body forceps and an operating handle. The catheter of the vascular foreign body forceps is an adjustable curved catheter. A through hole is arranged at the clamp head end of the vascular foreign body forceps. The through hole is used for passing a guide wire. Teeth are arranged opposite to each other on the clamp head of the clamp head end. The operating handle can control the bending degree of the adjustable curved catheter and the opening and closing of the clamp head.

2. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 1, characterized in that: The pliers head includes pliers, a fixed head and a connecting rod. The fixed head is a hollow structure with a U-shaped groove at the front end and a rear end connected to the end of the adjustable bend guide tube. The middle parts of the two pliers are hinged to the outer port of the fixed head. The outer ends of the two pliers are oppositely provided with teeth, and the inner ends are respectively hinged to one end of the connecting rod. The other ends of the two connecting rods are hinged by a pin shaft. The inner ends of the pliers and the connecting rod form a quadrilateral connecting rod mechanism. The pin shaft is connected to the pliers head pull ring of the operating handle through a traction wire.

3. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 2, characterized in that: The through holes are arranged on the front end of the pliers and the hinge shaft, and the pliers head is made of stainless steel.

4. The peripheral vascular in-stent restenosis opening catheter according to claim 2, characterized in that: One end of the control wire of the adjustable bend catheter is connected to the bend adjusting head, and the other end is connected to the bend adjusting component of the operating handle.

5. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 4, characterized in that: The outer diameter of the adjustable bend conduit is 2mm-5mm, the material of the adjustable bend conduit is fluorinated ethylene propylene copolymer, the surface of the adjustable bend conduit is coated with a hydrophilic coating, and the inner layer is coated with bismuth oxide developer; the control wire is inserted into the threading tube on the side wall of the adjustable bend conduit.

6. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 1, characterized in that: The operating handle includes a bending adjustment component, a gripping rod and a pliers head pull ring. The hollow cavity of the gripping rod is connected to the adjustable bending conduit. The front end of the gripping rod is connected to the adjustable bending conduit, the middle part is slidably provided with the bending adjustment component, and the rear end is slidably provided with the pliers head pull ring.

7. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 6, characterized in that: The bending adjustment component includes a slider and a sliding sleeve. A waist-shaped hole is provided in the middle of the holding rod. The guide wire passes through the waist-shaped hole into the adjustable bending guide tube. The slider is slidably arranged in the waist-shaped hole and the two ends of the slider are clamped in the annular groove in the sliding sleeve. The end of the control wire of the adjustable bending guide tube is connected to the middle of the slider, and the sliding sleeve is slidably arranged in the middle of the holding rod.

8. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 7, characterized in that: The middle part of the gripping rod is provided with a plurality of arcuate convex strips at intervals along the axial direction, and an arcuate clamping strip is provided on the inner side of the sliding sleeve. The central angles of the clamping strip and the arcuate convex strip are both less than 180°, and the clamping strip can be clamped on each of the arcuate convex strips respectively.

9. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 1, characterized in that: The diameter of the guide wire is 0.1 mm-1 mm, and the diameter of the through hole is 0.2 mm-1 mm.

10. The catheter for re-opening peripheral vascular in-stent restenosis or occlusion according to claim 1, characterized in that: The operating handle is made of plastic.

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