Dilation catheter system

Abstract

A dilation catheter system comprises a dilation catheter, a balloon and an outer catheter connected to the near end of the balloon. The micro catheter comprises an inner catheter section located in the inner cavity of the dilation catheter and a magnetic catheter section which is connected to the far end of the inner catheter section and extends out of the far end of the dilation catheter; the micro guide wire is arranged in conveying of the micro catheter in a penetrating mode, the micro guide wire is provided with a conductive coil and a set of wires electrically connected with the conductive coil, and the wires extend to the near end of the micro guide wire; and the electrifying device comprises a positive electrode output end and a negative electrode output end which are respectively connected with the wire. The conductive coil is electrified through the electrifying device, and the conductive coil generates a magnetic field to adsorb the magnetic tube section, so that the step effect is reduced, and the performance of the dilation catheter system penetrating through a narrow part is improved; after the stent reaches the target position, the power supply is cut off, and the magnetic tube section restores the original size to normally convey and release the stent; medical instruments do not need to be replaced for many times, convenience is improved, and surgical risks are reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a dilatation catheter system with high safety and usability. Background Art

[0002] Intracranial arterial atherosclerotic stenosis is one of the most common causes of stroke. With the development of interventional technology, balloon angioplasty or stent angioplasty can be used to open the stenosis site, reduce the risk of local thrombosis or acute occlusion, and achieve good clinical prognosis for patients with intracranial arterial stenosis who are ineffective with drug treatment.

[0003] Stent implantation usually involves first using a microcatheter in combination with a microguidewire to reach the target lesion, retaining the microguidewire in the target blood vessel, removing the microcatheter, replacing the dilatation catheter along the microguidewire to reach the stenosis, and using a balloon to dilate the stenosis; then withdrawing the dilatation catheter from the body, replacing the microcatheter along the microguidewire to reach the stenosis, withdrawing the microguidewire, and delivering the stent to the stenosis through the lumen of the microcatheter for release. During this operation, medical devices need to be exchanged multiple times in the patient's body. Clinical experience shows that the more devices are exchanged, the more likely it is to cause vascular damage to the patient, resulting in complications such as bleeding or ischemia. In view of this, there is a clinical need for a product that can reduce device exchanges during stent implantation.

[0004] In view of this, it is necessary to provide an improved dilatation catheter system to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a dilatation catheter system with high safety and usability.

[0006] In order to achieve one of the above-mentioned purposes of the utility model, the utility model adopts the following technical solutions:

[0007] A dilatation catheter system, comprising:

[0008] A dilatation catheter, comprising a balloon and an outer catheter connected to the proximal end of the balloon;

[0009] The microcatheter comprises an inner catheter section located in the inner cavity of the dilatation catheter, and a magnetic tube section connected to the distal end of the inner catheter section and extending out of the distal end of the dilatation catheter;

[0010] A micro guide wire is inserted into the delivery cavity of the micro catheter, wherein the micro guide wire is provided with a conductive coil and a group of conductive wires electrically connected to the conductive coil, and the conductive wires extend to the proximal end of the micro guide wire;

[0011] The power supply device comprises a positive output terminal and a negative output terminal connected to the wire.

[0012] Furthermore, the magnetic pipe section includes an inner layer, a reinforcement layer and an outer layer, and the outer layer has a magnetic element.

[0013] Furthermore, the magnetic element is at least one of magnetic powder and magnetic particles.

[0014] Furthermore, the micro-catheter further comprises a plurality of annular limiting rings arranged in the magnetic tube section, and the plurality of annular limiting rings are arranged at intervals along the axial direction of the micro-catheter.

[0015] Furthermore, the magnetic pipe section includes an inner layer, a reinforcement layer and an outer layer, and the annular limiting ring is arranged on the outer side of the reinforcement layer.

[0016] Furthermore, the diameter of the reinforcement layer in its original state is not less than the inner diameter of the annular limiting ring in its tightened state.

[0017] Furthermore, the distal end of the microcatheter also has a plurality of reinforcing wires arranged in the magnetic tube section, and the reinforcing wires extend along the axial direction of the microcatheter.

[0018] Furthermore, the magnetic tube segment includes an inner layer, a reinforcement layer and an outer layer, the reinforcement wire is located outside the reinforcement layer, and a plurality of the reinforcement wires are arranged at intervals along the circumferential direction of the microcatheter.

[0019] Furthermore, the inner conduit section and the magnetic tube section each include an inner layer, a reinforcement layer and an outer layer;

[0020] The inner layer material of the inner conduit section is PTFE material, and the inner layer material of the magnetic tube section is Pebax material or TPU material;

[0021] The reinforcing layer of the inner catheter section is a patterned nickel-titanium tube, and the reinforcing layer of the magnetic tube section is a braided or spring-wound stainless steel wire, or a cut stainless steel tube;

[0022] The outer layer of the inner conduit section is selected from one of nylon, Pebax material, and TPU material; the outer layer of the magnetic tube section is selected from one of nylon, Pebax material, and TPU material, and a magnetic element is arranged in the outer layer of the magnetic tube section.

[0023] Furthermore, the micro guidewire also includes a core wire and an insulating sleeve located outside the core wire, the conductive coil is wound around the distal end of the core wire, and the conductive wire is located between the core wire and the insulating sleeve.

[0024] The beneficial effects of the utility model are as follows: the utility model energizes the conductive coil through the power supply device, and the conductive coil generates a magnetic field to absorb the magnetic tube segment, so that the magnetic tube segment and the micro-guidewire are almost seamless, reducing the "step effect" and greatly improving the performance of the dilatation catheter system to pass through the narrow part. After the dilatation catheter system reaches the target position, the power supply device disconnects the power supply, and the magnetic tube segment returns to its original size to normally transport and release the stent; during the whole process, there is no need to replace the medical device multiple times, which greatly improves the convenience and reduces the risk of surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a dilatation catheter system of a preferred embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure of the dilatation catheter;

[0027] Figure 3 yes Figure 1 A schematic cross-sectional view of the magnetic tube segment of the microcatheter after being cut along the radial direction;

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the magnetic tube segment of the microcatheter;

[0029] Figure 5 It is a schematic diagram of the cooperation between the micro-guide wire and the energizing device of the utility model;

[0030] Figure 6 yes Figure 5 A partial enlarged view of .

[0031] Among them, 100-dilatation catheter system, 1-dilatation catheter, 11-balloon, 12-outer catheter, 2-microcatheter, 21-inner catheter segment, 22-magnetic tube segment, 221-third inner layer, 222-third reinforcement layer, 223-third outer layer, 23-annular limiting ring, 24-reinforcement wire, 3-micro guide wire, 31-conductive coil, 32-conducting wire, 33-core wire, 34-insulating sleeve, 4-power-on device, 5-catheter seat. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are included in the protection scope of the present invention. In the various illustrations of the present invention, for the convenience of illustration, some dimensions of structures or parts are exaggerated relative to other structures or parts, and therefore, are only used to illustrate the basic structure of the subject matter of the present invention.

[0033] In order to clearly express the position and direction described in the present invention, the operator of the dilatation catheter system 100 is used as a reference, the end close to the operator is the proximal end, and the end far from the operator is the distal end.

[0034] like Figure 1 to Figure 6 As shown, a dilatation catheter system 100 according to a preferred embodiment of the present invention comprises a dilatation catheter 1, a microcatheter 2 located in the dilatation catheter 1, a microguidewire 3 that can be inserted into the microcatheter 2, an energizing device 4 and a catheter seat 5.

[0035] The dilatation catheter 1 includes a balloon 11 and an outer catheter 12 connected to the proximal end of the balloon 11 .

[0036] The balloon 11 is an expandable component, having an expanded state and a contracted state, and the two states can be switched under the action of an external force. In the utility model, the balloon 11 is made of a material with good expandability such as nylon, segmented polyetheramide (Pebax), thermoplastic urethane (TPU), etc.

[0037] The outer catheter 12 can be a single-layer polymer tube, preferably a multi-layer composite tube. The multi-layer composite tube includes a first inner layer, a first reinforcement layer and a first outer layer. The first inner layer is made of a material with a low surface friction coefficient, such as polytetrafluoroethylene (PTFE), polyethylene (PE), etc. The inner surface is smooth, which is conducive to the insertion of the microcatheter 2. The first reinforcement layer is made of nickel-titanium, stainless steel or polymer and is formed by weaving, winding or tubular cutting. It has a certain strength, so that the dilatation catheter 1 has excellent compliance, elasticity, anti-fracture and anti-twisting properties. The first outer layer protects the inner structural layer and needs to have a certain hardness. It can be made of polymer materials such as nylon, Pebax material, TPU material, etc.

[0038] The microcatheter 2 is sleeved in the inner cavity of the dilatation catheter 1, and a liquid passage cavity is formed between the outer surface of the microcatheter 2 and the inner surface of the dilatation catheter 1, which is used to introduce liquid to fill the balloon 11 and make it in an expanded state. The dilatation catheter 1 and the microcatheter 2 constitute a balloon microcatheter, and the inner cavity of the microcatheter 2 constitutes a delivery cavity. During the process of being placed in the target position in the body, the balloon 11 is in a contracted state under negative pressure or body fluid pressure, which is convenient for clinical operation; after reaching the target stenosis, liquid is introduced into the liquid passage cavity to fill the balloon 11 and make it in an expanded state; and the stent can be directly delivered through the delivery cavity without the need to replace medical devices multiple times.

[0039] The microcatheter 2 includes an inner catheter segment 21 located in the inner cavity of the dilatation catheter 1, and a magnetic tube segment 22 connected to the distal end of the inner catheter segment 21. The magnetic tube segment 22 extends out of the distal end of the dilatation catheter 1, and is preferably adjacent to the distal end of the balloon 11. The magnetic tube segment 22 has an original state and a contracted state, and can contract in the radial direction under the action of the internal magnetic field, and can be restored to the original state by its own elastic force or memory when the internal magnetic field disappears.

[0040] Overall, the inner catheter segment 21 and the magnetic tube segment 22 are both composite multilayer structures, including an inner layer, a reinforcement layer, and an outer layer. The inner layer forms a tubular delivery cavity for delivering micro-guidewires, stents and other structures; the reinforcement layer plays a role in structural reinforcement, so that the micro-catheter 2 maintains a tubular structure; the outer layer plays a role in protecting the inner structural layer.

[0041] For the convenience of description, the inner layers of the inner duct segment 21 and the magnetic tube segment 22 are defined as the second inner layer and the third inner layer 221 respectively; the reinforcement layers of the inner duct segment 21 and the magnetic tube segment 22 are defined as the second reinforcement layer and the third reinforcement layer 222 respectively; the outer layers of the inner duct segment 21 and the magnetic tube segment 22 are defined as the second outer layer and the third outer layer 223 respectively.

[0042] The second inner layer and the third inner layer 221 together constitute the delivery cavity, and the stent moves from the proximal end to the distal end.

[0043] Preferably, the surface friction coefficient of the second inner layer is lower than that of the third inner layer 221, so as to facilitate the delivery of the stent, and the elastic modulus of the second inner layer is lower than that of the third inner layer 221, so as to facilitate the contraction of the tube body of the magnetic tube section 22. In this embodiment, the second inner layer is PTFE, which has low surface friction; the third inner layer 221 is made of a material with a high elastic modulus such as Pebax and TPU; the second inner layer and the third inner layer 221 are sleeved together and then heated and shrunk into one.

[0044] The second reinforcing layer and the third reinforcing layer 222 together constitute the skeleton structure of the microcatheter 2. Preferably, the strength of the second reinforcing layer is greater than the strength of the third reinforcing layer 222, and the shrinkage rate of the second reinforcing layer of the inner catheter segment 21 is lower than the shrinkage rate of the third reinforcing layer 222 of the magnetic tube segment 22, so that the configuration of the inner catheter segment 21 is maintained, which is conducive to the delivery of the stent; and the magnetic tube segment 22 is easy to shrink so as to fit on the micro guidewire 3.

[0045] In this embodiment, the second reinforcement layer of the inner catheter segment 21 is made of stainless steel, which can be made of stainless steel wire braided, wound with springs, or cut from a stainless steel tube. During the stent delivery process, the high strength of the stainless steel material can keep the tube shape from being stretched or elliptical, which is beneficial for stent delivery. The third reinforcement layer 222 is made of a nickel-titanium tube with engraved patterns, and the patterns are designed to achieve contraction and expansion within a certain range. The second reinforcement layer and the third reinforcement layer 222 are welded together.

[0046] The second outer layer and the third outer layer 223 are made of polymer materials, and nylon, Pebax material, TPU material, etc. can be selected.

[0047] Preferably, the third outer layer 223 is made of a shrinkable and expandable material, wherein a magnetic element is provided, and the magnetic element is at least one of magnetic powder and magnetic particles. The magnetic element is made of ferrite magnetic material and / or magnetic nickel-titanium material, and the ferrite magnetic material includes but is not limited to at least one of barium ferrite magnetic material and strontium ferrite magnetic material. The second outer layer and the third outer layer 223 are first sleeved together, and then shrunk into one piece by heat.

[0048] Furthermore, the microcatheter 2 also includes a plurality of annular limiting rings 23 disposed in the magnetic tube segment 22 , and the plurality of annular limiting rings 23 are arranged at intervals along the axial direction of the microcatheter 2 to limit the expansion degree of the magnetic tube segment 22 and to precisely control the radial dimension of the microcatheter 2 .

[0049] Specifically, the magnetic tube segment 22 radially contracts under the action of the internal magnetic field, and when the internal magnetic field disappears, it can recover to its original state through its own elastic force or memory force; compared with the contracted state, the process of the magnetic tube segment 22 recovering to its original state can be called outward expansion, and the purpose of the limiting ring 23 is to limit the degree of outward expansion of the magnetic tube segment 22.

[0050] The annular limiting ring 23 has a certain axial tensile rigidity, but a low bending rigidity, and can bend and deform when the magnetic tube section 22 contracts radially, that is, it is in a weak state when not subjected to outward tension, and is in a taut state when subjected to radial outward internal support force, thereby limiting the expansion degree of the microcatheter 2. Preferably, the annular limiting ring 23 can be made of a ring structure such as nylon wire.

[0051] The inventors have found that: in each film layer of the magnetic tube segment 22, the radial expansion degree of the third reinforcement layer 222 determines the radial size of the magnetic tube segment 22; therefore, it is preferred to arrange the annular limit ring 23 outside the third reinforcement layer 222, that is, the annular limit ring 23 is arranged between the third reinforcement layer 222 and the third outer layer 223, to limit the expansion of the third reinforcement layer 222.

[0052] Furthermore, the third reinforcement layer 222 is designed so that its diameter in the original state (the expanded final diameter when recovering from the contracted state) is not less than the diameter of the annular limiting ring 23, allowing a certain amount of outward expansion on the basis of the limiting force of the annular limiting ring 23; that is, the third reinforcement layer 222 is designed so that there is still a certain radial expansion force after reaching the size of the annular limiting ring 23, ensuring that the lumen can always expand to the size of the annular limiting ring 23, thereby achieving the stability and accuracy of the lumen after expansion.

[0053] In addition, the microcatheter 2 also includes a plurality of reinforcing wires 24 arranged in the magnetic tube section 22, and the reinforcing wires 24 extend along the axial direction of the microcatheter 2, which can ensure that when the stent moves in the delivery cavity of the microcatheter 2, the delivery resistance of the stent and the inner wall of the microcatheter 2 will not cause axial stretching deformation of the microcatheter 2 cavity, thereby enhancing the convenience of stent delivery of the microcatheter 2.

[0054] The inventors have found that "in each film layer of the magnetic tube segment 22, the axial strength of the third reinforcement layer 222 determines the axial strength of the magnetic tube segment 22". Therefore, the reinforcement wire 24 is preferably arranged on the outside of the third reinforcement layer 222 of the magnetic tube segment 22, which can more effectively improve the axial strength of the magnetic tube segment 22.

[0055] Furthermore, the plurality of reinforcing wires 24 are arranged at intervals along the circumferential direction of the microcatheter 2, preferably evenly, so that the tensile strength at each position in the radial direction remains relatively uniform.

[0056] In this embodiment, four reinforcing wires 24 are provided, and the four reinforcing wires 24 are evenly arranged along the circumferential direction of the micro-catheter 2 .

[0057] The annular limiting ring 23 and the reinforcing wire 24 are both located between the third reinforcing layer 222 and the third outer layer 223. Specifically, the reinforcing wire 24 can be firstly arranged outside the third reinforcing layer 222, and then the annular limiting ring 23 can be sleeved outside the third reinforcing layer 222 with the reinforcing wire 24. Alternatively, the annular limiting ring 23 can be firstly arranged outside the third reinforcing layer 222, and then the reinforcing wire 24 can be arranged outside the annular limiting ring 23; the effects of the two methods are basically the same.

[0058] Based on the structural coordination of the third inner layer 221, the third reinforcement layer 222, the third outer layer 223, the annular limit ring 23, and the reinforcement wire 24, the magnetic tube segment 22 has a certain strength, and its radial dimension can be precisely adjusted under the control of the internal magnetic field. It can fit on the micro-guidewire 3 and follow the micro-guidewire 3 through the blood vessel and even through the lesion. It can also restore to its original size after reaching the target position, which is convenient for delivering structures such as stents.

[0059] The micro guidewire 3 is inserted into the delivery cavity of the micro catheter 2 , and is provided with a conductive coil 31 and a group of conductive wires 32 electrically connected to the conductive coil 31 . The conductive wires 32 extend to the proximal end of the micro guidewire 3 to be connected to the energizing device 4 .

[0060] Among them, a group of wires 32 is a pair of wires or two wires, which close and connect the conductive coil 31 to the positive and negative poles of the power supply device 4. The conductive coil 31 forms a magnetic field after power is turned on, and attracts the magnetic tube section 22 with magnetic elements. After power is turned off, the magnetic field disappears, and the magnetic tube section 22 returns to its original state.

[0061] It should be noted that the magnetic pipe segment in this article is a pipe segment with ferromagnetism, for example, it is provided with magnetic elements such as magnetic powder and magnetic particles, and can be magnetically adsorbed by permanent magnets and electromagnets, but there is no inherent magnetic pole. Therefore, no matter what the direction of the magnetic field formed by the conductive coil 31 after power is turned on, the magnetic pipe segment 22 can be adsorbed.

[0062] Specifically, the micro guidewire 3 also includes a core wire 33 and an insulating sleeve 34 located outside the core wire 33. The conductive coil 31 is wound around the distal end of the core wire 33. The conductive wire 32 extends axially along the core wire 33 to its proximal end. The insulating sleeve 34 is sleeved outside the core wire, the conductive coil 31, and the conductive wire 32, and heat-shrunk to form the micro guidewire 3.

[0063] Preferably, the core wire 33 is made of nickel titanium, and can strengthen the magnetic field when the conductive coil 31 is energized. The conductive coil 31 is made of copper, and is tightly wound around the distal end of the core wire 33; a pair of conductive wires 32 extend from the positive and negative ends of the conductive coil 31 to the proximal end of the core wire 33 and extend outward, and can be connected to the energizing device 4.

[0064] The power supply device 4 is a power source, including a positive output terminal and a negative output terminal respectively connected to a pair of wires 32 to realize powering on and off of the conductive coil 31 .

[0065] The catheter seat 5 is made of polymer materials such as nylon and PC, and its structure and usage adopt the existing technology, which will not be described in detail here.

[0066] The structure and clinical use of the dilatation catheter system 100 of the present invention are described in detail below.

[0067] During clinical use, the micro-guidewire 3 is passed through the micro-catheter 2, and the conductive coil 31 is located inside the magnetic tube segment 22. The conductive coil 31 is energized by the power supply device 4, and the conductive coil 31 generates a magnetic field to absorb the magnetic tube segment 22, and the magnetic tube segment 22 is attached to the micro-guidewire 3; at this time, the outer diameter of the magnetic tube segment 22 becomes smaller, and it is attached to the micro-guidewire 3 and there is almost no gap between it and the micro-guidewire 3, which reduces the "step effect". When crossing the blood vessel, the balloon micro-catheter can find the way together with the micro-guidewire 3, and follow the micro-guidewire 3 to cross the lesion, which greatly improves the performance of the dilatation catheter system 100 to cross the stenosis. After the dilatation catheter system 100 reaches the target position, liquid is introduced through the liquid passage cavity to fill the balloon 11 so that it can open the stenosis of the blood vessel. The power-on device 4 cuts off the power to the conductive coil 31, and the magnetic tube segment 22 recovers its original size due to the shape memory function of the nickel-titanium reinforcement layer or its own elastic function, thereby preventing the entire stent system from encountering great resistance in the microcatheter 2, so as to normally transport and release the stent and ensure that the stent is smoothly pushed into place.

[0068] The micro guidewire 3 is withdrawn, and the stent is delivered to the target position along the delivery lumen of the microcatheter 2 through the delivery guidewire. The balloon microcatheter is withdrawn, and the stent is separated from the microcatheter 2, expanded and fixed at the stenotic site of the blood vessel to dilate the blood vessel.

[0069] During the entire clinical use process, there is no need to replace medical devices multiple times, which greatly improves convenience and reduces surgical risks. In addition, the utility model only uses the delivery of stents as an example for illustration. In fact, the dilatation catheter system 100 can deliver a variety of medical devices for clinical use, which will not be described one by one here.

[0070] In summary, the utility model energizes the conductive coil 31 through the power supply device 4, and the conductive coil 31 generates a magnetic field to absorb the magnetic tube segment 22, so that the magnetic tube segment 22 and the micro-guidewire 3 are almost seamless, reducing the "step effect" and greatly improving the performance of the dilatation catheter system 100 to pass through the narrow part. After the dilatation catheter system 100 reaches the target position, the power supply device 4 disconnects the power supply, and the magnetic tube segment 22 restores the original size to normally deliver and release the stent; it can solve the problem that the dilatation catheter system 100 is difficult to pass through the lesion due to the large outer diameter of the distal end, and at the same time does not affect the product's in-place performance, stent delivery performance and other performance; during the whole process, there is no need to replace medical equipment many times, which greatly improves convenience and reduces surgical risks.

[0071] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0072] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A dilatation catheter system, characterized in that: include: A dilatation catheter, comprising a balloon and an outer catheter connected to the proximal end of the balloon; The microcatheter comprises an inner catheter section located in the inner cavity of the dilatation catheter, and a magnetic tube section connected to the distal end of the inner catheter section and extending out of the distal end of the dilatation catheter; A micro guide wire is inserted into the delivery cavity of the micro catheter, wherein the micro guide wire is provided with a conductive coil and a group of conductive wires electrically connected to the conductive coil, and the conductive wires extend to the proximal end of the micro guide wire; The power supply device comprises a positive output terminal and a negative output terminal connected to the wire.

2. The dilatation catheter system according to claim 1, characterized in that: The magnetic pipe section comprises an inner layer, a reinforcement layer and an outer layer, wherein the outer layer has a magnetic element.

3. The dilatation catheter system according to claim 1, characterized in that: The micro-catheter further comprises a plurality of annular limiting rings arranged in the magnetic tube section, and the plurality of annular limiting rings are arranged at intervals along the axial direction of the micro-catheter.

4. The dilatation catheter system according to claim 3, characterized in that: The magnetic pipe section comprises an inner layer, a reinforcement layer and an outer layer, and the annular limiting ring is sleeved on the outer side of the reinforcement layer.

5. The dilatation catheter system according to claim 4, characterized in that: The diameter of the reinforcing layer in its original state is not less than the inner diameter of the annular limiting ring in its tightened state.

6. The dilatation catheter system according to claim 1, characterized in that: The distal end of the micro-catheter is also provided with a plurality of reinforcing wires arranged in the magnetic tube section, and the reinforcing wires extend along the axial direction of the micro-catheter.

7. The dilatation catheter system according to claim 6, characterized in that: The magnetic tube section comprises an inner layer, a reinforcement layer and an outer layer. The reinforcement wires are located outside the reinforcement layer, and a plurality of the reinforcement wires are arranged at intervals along the circumferential direction of the micro-catheter.

8. The dilatation catheter system according to any one of claims 1 to 7, characterized in that: The inner conduit section and the magnetic tube section both include an inner layer, a reinforcement layer and an outer layer; The inner layer material of the inner conduit section is PTFE material, and the inner layer material of the magnetic tube section is Pebax material or TPU material; The reinforcing layer of the inner catheter section is a patterned nickel-titanium tube, and the reinforcing layer of the magnetic tube section is a braided or spring-wound stainless steel wire, or a cut stainless steel tube; The outer layer of the inner conduit section is selected from one of nylon, Pebax material, and TPU material; the outer layer of the magnetic tube section is selected from one of nylon, Pebax material, and TPU material, and a magnetic element is arranged in the outer layer of the magnetic tube section.

9. The dilatation catheter system according to claim 1, characterized in that: The micro guide wire also includes a core wire and an insulating sleeve located outside the core wire. The conductive coil is wound around the distal end of the core wire, and the conductive wire is located between the core wire and the insulating sleeve.

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