An adjustable-bend high-torque balloon microcatheter

Abstract

This invention relates to an adjustable-bend high-torque balloon microcatheter, comprising an adjustable-bend base, a microcatheter body, and a distal balloon. Both ends of the microcatheter body are connected to the adjustable-bend base and the distal balloon, respectively. The microcatheter body includes an inner lumen, an outer lumen, and a traction wire. The outer lumen is sleeved outside the inner lumen, forming an annular gap between them. The outer lumen and inner lumen are connected by multiple connecting structures spaced from distal to proximal. The traction wire is disposed within the annular gap, and both ends are connected to a contrast ring within the distal balloon and the adjustable-bend base, respectively. This adjustable-bend high-torque balloon microcatheter exhibits excellent resistance to torque, preventing distal-end twisting, avoiding potential energy accumulation within the microcatheter, and reducing surgical risks. Furthermore, the traction wire allows the microcatheter to bend, enabling it to pass through tortuous blood vessels or lesions. The distal end of the microcatheter body utilizes a balloon design to temporarily occlude blood flow and fix the microcatheter.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an adjustable high-torque balloon microcatheter. Background Technology

[0002] Interventional medicine, guided by imaging techniques (X-ray, ultrasound, CT), involves inserting specialized catheters or instruments into the lesion site via percutaneous puncture or through existing bodily orifices for angiography, diagnosis, and treatment. Due to its minimally invasive nature, fewer complications, and wide range of applications (including cardiovascular and cerebrovascular diseases, peripheral vascular tumors, and non-vascular areas), it has become the third major clinical treatment method.

[0003] However, conventional microcatheters have limited functionality. When navigating tortuous blood vessels or lesions, the distal end may fail to pass smoothly, hindering the surgeon's ability to continue treatment. Furthermore, during rotation and advancement, torque can cause asynchronous rotation between the proximal and distal ends, leading to potential energy accumulation within the catheter and posing clinical risks to the patient. Additionally, while existing microcatheters, due to their small size, can be advanced into narrow blood vessels, their fixation is often poor, making them prone to movement during advancement, increasing the surgeon's difficulty and surgical risks. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable high-torque balloon microcatheter, which has the function of being adjustable to pass through tortuous blood vessels or lesions, and reduces or eliminates the torsion phenomenon when the microcatheter rotates, avoids potential energy accumulation, reduces surgical risks, and at the same time has the function of occlusion and fixation to prevent the microcatheter from moving during the operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An adjustable-bend high-torque balloon microcatheter includes an adjustable-bend base, a microcatheter body, and a distal balloon. Both ends of the microcatheter body are connected to the adjustable-bend base and the distal balloon, respectively. The microcatheter body includes an inner lumen, an outer lumen, and a traction wire. The outer lumen is sleeved outside the inner lumen, and an annular gap is formed between the outer lumen and the inner lumen. The outer lumen and the inner lumen are connected by multiple connecting structures spaced from distal to proximal within the annular gap. The traction wire is disposed within the annular gap, and both ends of the traction wire are connected to a radiopaque ring within the distal balloon and the adjustable-bend base, respectively.

[0007] Optionally, both the inner and outer lumen tubes are composed of an inner layer, a middle layer, and an outer layer arranged sequentially from the inside to the outside. The inner and outer layers are polymer material layers, and the middle layer is a metal woven mesh.

[0008] Optionally, the strength of the inner layer and the proximal and middle sections of the outer layer of the outer lumen tube is greater than the strength of the inner layer and the distal section of the outer layer of the outer lumen tube.

[0009] Optionally, the strength of the inner lumen tube is higher than that of the outer lumen tube.

[0010] Optionally, at least three connection structures are provided between the outer lumen tube and the inner lumen tube, and the connection structures are provided at least at the proximal end, the middle section and the distal end of the microcatheter body.

[0011] Optionally, the adjustable bending base includes:

[0012] Base body;

[0013] An adjustment structure is provided on the base body. The adjustment structure includes an external meshing gear and a rotating wheel. The external meshing gear is fixedly connected to the rotating wheel, and the traction wire is connected to the rotating wheel and / or the external meshing gear.

[0014] Optionally, the adjustable bending base further includes a sliding locking mechanism, which is slidably disposed on the base body, and the end of the sliding locking mechanism facing the adjustment structure is provided with locking teeth that cooperate with the external meshing gear.

[0015] Optionally, the balloon body of the distal balloon is connected to the outer lumen tube, and the imaging ring of the distal balloon is disposed in the balloon body and in the inner lumen tube;

[0016] When the distal balloon is under negative pressure, the balloon body is attached to the inner lumen tube, and the balloon body is flush with the outer lumen tube or the radial dimension of the balloon body is smaller than the radial dimension of the outer lumen tube.

[0017] Optionally, the distal balloon further includes a distal tube disposed at one end of the balloon body away from the microcatheter body, the distal tube being made of a soft polymer material that is opaque and contains a contrast agent.

[0018] Optionally, the microcatheter body includes two traction wires, which are symmetrically distributed within the microcatheter body.

[0019] As can be seen from the above technical solutions, this invention discloses an adjustable-bend high-torque balloon microcatheter, which includes an adjustable-bend base, a microcatheter body, and a distal balloon. The two ends of the microcatheter body are connected to the adjustable-bend base and the distal balloon, respectively. The microcatheter body includes an inner lumen, an outer lumen, and a traction wire. The outer lumen is sleeved outside the inner lumen, and an annular gap is formed between the outer and inner lumen. The outer and inner lumen are connected by multiple connecting structures spaced from distal to proximal within the annular gap. The traction wire is disposed within the annular gap, and its two ends are connected to the imaging ring within the distal balloon and the adjustable-bend base, respectively. The inner lumen of the microcatheter body of the aforementioned adjustable-bend high-torque balloon microcatheter... Multiple connecting structures are installed in the gap between the inner and outer lumen tubes to connect them, so that the strength of the inner lumen tube acts on the outer lumen tube, improving the overall strength of the microcatheter, enhancing its resistance to torque, preventing distal twisting of the microcatheter during surgical advancement, avoiding the accumulation of potential energy inside the microcatheter, and thus reducing surgical risks. Furthermore, the traction wire inside the microcatheter body allows the microcatheter to bend and pass through tortuous blood vessels or lesions. The distal end of the microcatheter body adopts a balloon design, which can be inflated by injecting saline during surgery to temporarily block blood flow. This reduces the surgeon's equipment usage, fixes the microcatheter, and prevents displacement of the microcatheter due to force during instrument advancement, reducing the surgeon's operational risks and lowering surgical risks. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection structure distribution of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention;

[0024] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0025] Figure 5 A cross-sectional view of the microcatheter body of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the microcatheter body in a bent state of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention.

[0027] Figure 7 A schematic diagram of the distal bending state of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the adjustable bending base of the adjustable bending high-torque balloon microcatheter provided in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the distal balloon of the adjustable high-torque balloon microcatheter provided in an embodiment of the present invention.

[0030] in:

[0031] 100 is an adjustable bendable base; 101 is the base body; 102 is an external meshing gear; 103 is a rotating wheel; 104 is a sliding locking mechanism; 200 is the microcatheter body; 201 is the outer lumen tube; 201a is the outer layer of the outer lumen tube; 201b is the middle layer of the outer lumen tube; 201c is the inner layer of the outer lumen tube; 202 is the inner lumen tube; 202a is the outer layer of the inner lumen tube; 202b is the middle layer of the inner lumen tube; 202c is the inner layer of the inner lumen tube; 203 is a connecting structure; 204 is a traction wire; 300 is a distal balloon; 301 is the balloon body; 302 is a contrast-enhancing ring; 303 is the distal tube. Detailed Implementation

[0032] The core of this invention is to provide an adjustable high-torque balloon microcatheter. The structural design of this adjustable high-torque balloon microcatheter enables it to bend to pass through tortuous blood vessels or lesions, and reduces or eliminates the torsion phenomenon when the microcatheter rotates, avoiding potential energy accumulation and reducing surgical risks. At the same time, it also has a occlusion and fixation function to prevent the microcatheter from moving during the operation.

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 4 , Figure 1 This is a schematic diagram of the adjustable-bend high-torque balloon microcatheter provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal structure of the adjustable-bend high-torque balloon microcatheter provided in an embodiment of the present invention. Figure 3This is a schematic diagram showing the connection structure distribution of the adjustable-bend high-torque balloon microcatheter provided in an embodiment of the present invention. Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0035] An adjustable high-torque balloon microcatheter is disclosed in this embodiment of the invention. The adjustable high-torque balloon microcatheter includes an adjustable base 100, a microcatheter body 200, and a distal balloon 300.

[0036] The microcatheter body 200 is connected at both ends to an adjustable base 100 and a distal balloon 300, respectively. The microcatheter body 200 includes an inner lumen 202, an outer lumen 201, and a traction wire 204. The outer lumen 201 is sleeved outside the inner lumen 202, forming an annular gap between them. The outer lumen 201 and the inner lumen 202 are connected by multiple connecting structures 203 spaced apart from the distal to the proximal end within the annular gap. The connecting structures 203 can be created by thermal bonding or chemical bonding, or by using a laser... A light or soldering iron is used to fuse the inner and outer tube materials 201 together, forming a connection structure 203 through spot welding. Alternatively, a hole can be drilled in the outer tube 201, and a small amount of glue, adhesive, epoxy resin, or other fluid material can be used to connect the outer tube 201 to the inner tube 202 to form the connection structure 203. The traction wire 204 is placed within the annular gap, with its two ends connected to the imaging ring 302 inside the distal balloon 300 and the adjustable base 100, respectively. The surgeon can determine the balloon position through the imaging ring 302, facilitating the surgeon's operation. In this case, "distal" refers to the end away from the adjustable base 100, and "proximal" refers to the end close to the adjustable base 100.

[0037] As can be seen, compared with the prior art, the adjustable high-torque balloon microcatheter provided in this embodiment of the invention has multiple connecting structures 203 in the gap between the inner and outer lumen tubes 201 of the microcatheter body 200 to connect the inner and outer lumen tubes 201. This allows the strength of the inner lumen tube 202 to act on the outer lumen tube 201, improving the overall strength of the microcatheter, increasing the microcatheter's resistance to torque, preventing the distal end of the microcatheter from twisting during surgical advancement, avoiding the accumulation of potential energy inside the microcatheter, thereby reducing surgical risks. Furthermore, the traction wire 204 inside the microcatheter body 200 allows the microcatheter to bend, enabling it to pass through tortuous blood vessels or lesions, such as... Figure 7 As shown, the traction wire 204 can bend the distal end of the microcatheter. The distal end of the microcatheter body 200 adopts a balloon design. During the operation, the balloon can be inflated by injecting saline to temporarily block blood flow and open the blood flow loop, which facilitates the delivery of therapeutic agents. This reduces the operator's equipment usage. In addition, the balloon is attached to the blood vessel wall to fix the microcatheter and prevent the microcatheter from being displaced by force during the operation of the instrument, thereby reducing the operator's operation risk and lowering the surgical risk.

[0038] As a preferred option, such as Figure 5 and Figure 6 As shown, in this embodiment of the invention, the microcatheter body 200 adopts a coaxial metal braided tube design. The inner lumen tube 202 and the outer lumen tube 201 are both composed of an inner layer, a middle layer and an outer layer arranged sequentially from the inside to the outside. The inner layer and the outer layer are polymer material layers. The materials of the inner layer and the outer layer can be the same or different. The middle layer is a metal braided mesh.

[0039] Specifically, the inner layer and the proximal and middle sections of the outer layer of the aforementioned external lumen tube 201 are stronger than the distal ends of the inner and outer layers of the external lumen tube 201, in order to improve the flexibility of the distal end of the microcatheter and avoid the microcatheter puncturing blood vessels.

[0040] The outer end, distal end, and middle section of the inner tube 202 are made of high-hardness polymer material to provide good support, while the inner layer is made of smooth polymer material to facilitate the delivery of drugs or devices.

[0041] Furthermore, in this embodiment of the invention, the strength of the inner tube is higher than that of the outer tube. During the pushing process, the inner tube transmits torque to the outer tube through the connection point between the inner and outer tubes, thereby increasing the overall torque of the tube body and reducing or eliminating the accumulation of potential energy.

[0042] To further optimize the above technical solution, at least three connection structures 203 are provided between the outer lumen tube 201 and the inner lumen tube 202, and connection structures 203 are provided at least at the proximal end, middle section and distal end of the microcatheter body 200 to ensure the overall resistance of the microcatheter body 200 to torque.

[0043] Preferably, in an embodiment of the present invention, such as Figure 2 and Figure 8 As shown, the adjustable bending base 100 includes a base body 101 and an adjustment structure. The adjustment structure is disposed on the base body 101 and includes an external meshing gear 102 and a rotating wheel 103. The external meshing gear 102 is fixedly connected to the rotating wheel 103. The traction wire 204 is connected to the rotating wheel 103 and / or the external meshing gear 102. When the distal end of the microcatheter needs to be rotated, the external meshing gear 102 can be rotated clockwise or counterclockwise, and the distal end of the microcatheter can be pulled to rotate by the traction wire 204.

[0044] Furthermore, in this embodiment of the invention, the adjustable base 100 further includes a sliding locking mechanism 104. The sliding locking mechanism 104 is slidably disposed on the base body 101, and the end of the sliding locking mechanism 104 facing the adjustment structure is provided with locking teeth that cooperate with the external meshing gear 102. The sliding locking mechanism 104 can be used to lock the adjustment structure during the operation, thereby keeping the distal end of the microcatheter in the current rotation state and avoiding misoperation.

[0045] As a preferred option, such as Figure 9 As shown, in this embodiment of the invention, the balloon body 301 of the distal balloon 300 is connected to the outer lumen tube 201, and the imaging ring 302 of the distal balloon 300 is disposed inside the balloon body 301 and disposed in the inner lumen tube 202; when the distal balloon 300 is in a negative pressure state, the balloon body 301 is attached to the inner lumen tube 202, and the balloon body 301 is flush with the outer lumen tube 201 or the radial dimension of the balloon body 301 is smaller than the radial dimension of the outer lumen tube 201.

[0046] To further optimize the above technical solution, the distal balloon 300 also includes a distal tube 303. The distal tube 303 is disposed at the end of the balloon body 301 away from the microcatheter body 200. The distal tube 303 is made of a soft polymer material that is opaque and contains a contrast agent, so as to facilitate X-ray imaging.

[0047] Preferably, one or more traction wires 204 may be disposed within the microcatheter body 200. In embodiments of the present invention, such as... Figure 5 As shown, the microcatheter body 200 includes two traction wires 204, which are symmetrically distributed within the microcatheter body 200.

[0048] The adjustable high-torque balloon microcatheter will be described in detail below with reference to specific embodiments.

[0049] Example 1

[0050] The microcatheter body 200 consists of coaxial inner and outer lumen tubes 201 with an effective length of 110 cm. The inner and proximal and middle sections of the outer lumen tube 201 are made of high-strength Pebax material, while the distal section is made of low-strength Pebax material to improve distal flexibility. The proximal, distal, and middle sections of the outer lumen tube 202 are all made of high-strength Pebax material, while the inner layer is made of PTFE material. The inner lumen tube 202 has an outer diameter of 0.0255 in and an inner diameter of 0.0200 in. The outer lumen tube 201 has an outer diameter of 0.0370 in and an inner diameter of 0.0315 in. The gap between the inner and outer lumen tubes 201 is 0.006 in. They are connected by three connecting structures 203 at the distal end, proximal end, and intermediate section to enhance torque. A 120 cm long stainless steel traction wire 204 with a diameter of 0.003 in is embedded in the gap, connecting the adjustable bending base 100 to the distal imaging ring 302. The distal balloon 300 is bonded to the 7 mm long imaging ring 302 and the terminal tube 303.

[0051] In application, the adjustable high-torque balloon microcatheter is first pushed into the patient's body, rotated during advancement to avoid puncturing blood vessels. Upon reaching a tortuous vessel, the angle of the distal end of the microcatheter is adjusted using the adjustable base 100 to ensure smooth passage and reach the target position 100cm from the vessel outlet. Once the target area is reached, saline is injected into the distal balloon 300 to inflate the balloon and conform it to the blood vessel, fixing the microcatheter and blocking blood flow. The operator then injects therapeutic medication through the microcatheter lumen; the medication flows with the bloodstream to the lesion for treatment. After treatment, the pressure is released. The saline is aspirated, and the distal balloon 300 contracts until it is flush with the outer lumen tube 201. The operator then slowly withdraws the microcatheter.

[0052] Because of the use of the adjustable high-torque balloon microcatheter provided in this embodiment of the invention, the microcatheter has minimal torsion during delivery, ensuring smooth delivery. The adjustable design ensures that the microcatheter passes smoothly through complex and tortuous blood vessels, greatly improving the surgeon's delivery efficiency. The distal balloon 300 can fix the microcatheter and block blood flow, making the delivery of medication very smooth for the surgeon, eliminating concerns about microcatheter displacement and affecting treatment.

[0053] Example 2

[0054] In this embodiment, the microcatheter body 200 consists of coaxial inner and outer lumen tubes 201 with an effective length of 130 cm. The proximal and middle sections of the inner and outer layers of the outer lumen tube 201 are made of high-strength nylon, while the distal end is made of low-strength Pebax material to improve distal flexibility. The proximal, distal, and middle sections of the outer layer of the inner lumen tube 202 are all made of high-strength PI material, while the inner layer is made of HDPE material. The inner lumen tube 202 has an outer diameter of 0.0260 in and an inner diameter of 0.0200 in. The outer lumen tube 201 has an outer diameter of 0.0380 in and an inner diameter of 0.0320 in. The gap between the inner lumen tube 202 and the outer lumen tube 201 is 0.006 in. They are connected by six connecting structures 203 at the distal end, proximal end, and intermediate section to enhance torque. A 150 cm long stainless steel traction wire 204 with a diameter of 0.003 in is embedded in the gap, which connects the adjustable bending base 100 to the distal imaging ring 302, the distal balloon 300 to the 7 mm long imaging ring 302, and the end tube 303.

[0055] In application, the adjustable high-torque balloon microcatheter is first pushed into the patient's body, rotated for advancement to avoid puncturing blood vessels. The distal angle of the catheter is adjusted using the adjustable base 100 to smoothly pass through tortuous blood vessels. Advancement continues until the target area is reached. The target location is 120cm from the blood vessel outlet. The operator injects saline into the distal balloon 300 to inflate the balloon and conform it to the blood vessel, fixing the microcatheter and blocking blood flow. The operator then pushes the microsphere through the inner lumen 202. The microsphere flows with the blood flow to the tumor vessels, embolizing them and cutting off blood supply to the terminal segment, effectively "starving" the target cells. After advancement, the pressure is released. The saline is aspirated, and the distal balloon 300 contracts until it is flush with the outer lumen 201. The operator then slowly withdraws the microcatheter.

[0056] During embolization therapy, the distal balloon 300 blocks blood flow and fixes the microcatheter, allowing for smooth delivery of the microsphere. This blocks backflow caused by the blocked blood flow, facilitating the delivery of the microsphere into the tumor blood vessels and greatly improving the surgeon's efficiency.

[0057] Example 3

[0058] In this embodiment, the microcatheter body 200 consists of coaxial inner and outer lumen tubes 201 with an effective length of 150 cm. The proximal and middle sections of the outer lumen tube 201 are made of high-strength Pebax material, while the distal section is made of low-strength Pebax material to improve distal flexibility. The proximal and middle sections of the inner lumen tube 201 are made of high-strength PI material, while the distal section is made of low-strength PI material to improve the compressive strength of the outer lumen tube 201. The proximal, distal, and middle sections of the outer lumen tube 202 are all made of high-strength PI material, while the inner layer is made of LDPE material. The inner lumen tube 202 has an outer diameter of 0.0320 in and an inner diameter of 0.0260 in. The outer lumen tube 201 has an outer diameter of 0.0440 in and an inner diameter of 0.0380 in. The gap between the inner and outer lumen tubes 201 is 0.006 in. They are connected by nine connecting structures 203 at the distal end, proximal end, and intermediate section to enhance torque. A 180 cm long stainless steel traction wire 204 with a diameter of 0.003 in is embedded in the gap, connecting the adjustable bending base 100 to the distal imaging ring 302. The distal balloon 300 is bonded to the 7 mm long imaging ring 302 and the terminal tube 303.

[0059] In this procedure, an adjustable, high-torque balloon microcatheter is advanced into the patient's body until it reaches the carotid aneurysm. The operator adjusts the microcatheter tip using the adjustable base 100 to guide it into the aneurysm. Saline solution is then injected to inflate the balloon and seal the aneurysm opening. Next, the operator pushes in coils through the inner tube 202 until the aneurysm is completely filled, terminating the blood supply. The aneurysm, deprived of its blood supply, gradually "dies." Afterward, the pressure is released, and the operator slowly withdraws the microcatheter.

[0060] In the treatment of carotid artery aneurysms, some aneurysms are quite large. To prevent coil spillage, ordinary microcatheters require additional use with occlusion balloons to block the aneurysm before coils can be pushed in for treatment. However, with this invention, the aneurysm can be directly blocked and coils pushed in, which greatly improves the surgeon's efficiency, reduces surgical risks, and alleviates the burden on patients.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] It should be understood that the use of terms such as "system," "device," "unit," and / or "module" in this application is merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0063] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0064] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0065] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0066] If a flowchart is used in this application, it is used to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0067] It should also be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the article or device that includes the aforementioned element.

[0068] This document uses specific examples to illustrate the principles and implementation methods of this patent. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this patent. It should be noted that for those skilled in the art, several improvements and modifications can be made to this patent without departing from the principles of this patent, and these improvements and modifications also fall within the protection scope of the claims of this patent.

Claims

1. An adjustable-bend high-torque balloon microcatheter, characterized in that, The device includes an adjustable base, a microcatheter body, and a distal balloon. Both ends of the microcatheter body are connected to the adjustable base and the distal balloon, respectively. The microcatheter body includes an inner lumen, an outer lumen, and a traction wire. The outer lumen is sleeved outside the inner lumen, and an annular gap is formed between the outer lumen and the inner lumen. The outer lumen and the inner lumen are connected by multiple connecting structures spaced from distal to proximal within the annular gap. The traction wire is disposed within the annular gap, and both ends of the traction wire are connected to a contrast ring within the distal balloon and the adjustable base, respectively. The inner tube has a higher strength than the outer tube; At least three connection structures are provided between the outer lumen tube and the inner lumen tube, and the connection structures are provided at least at the proximal end, the middle section and the distal end of the microcatheter body. The adjustable bending base includes: Base body; An adjustment structure is provided on the base body. The adjustment structure includes an external meshing gear and a rotating wheel. The external meshing gear is fixedly connected to the rotating wheel. The traction wire is connected to the rotating wheel and / or the external meshing gear. The adjustable bending base also includes a sliding locking mechanism. The sliding locking mechanism is slidably disposed on the base body, and the end of the sliding locking mechanism facing the adjustment structure is provided with locking teeth that cooperate with the external meshing gear.

2. The adjustable-bend high-torque balloon microcatheter according to claim 1, characterized in that, Both the inner and outer lumens are composed of an inner layer, a middle layer, and an outer layer arranged sequentially from the inside to the outside. The inner and outer layers are made of polymer materials, and the middle layer is a metal woven mesh.

3. The adjustable high-torque balloon microcatheter according to claim 2, characterized in that, The strength of the inner layer and the proximal and middle sections of the outer layer of the outer lumen tube is greater than the strength of the inner layer and the distal section of the outer layer of the outer lumen tube.

4. The adjustable-bend high-torque balloon microcatheter according to any one of claims 1-3, characterized in that, The balloon body of the distal balloon is connected to the outer lumen tube, and the imaging ring of the distal balloon is disposed in the balloon body and in the inner lumen tube; When the distal balloon is under negative pressure, the balloon body is attached to the inner lumen tube, and the balloon body is flush with the outer lumen tube or the radial dimension of the balloon body is smaller than the radial dimension of the outer lumen tube.

5. The adjustable-bend high-torque balloon microcatheter according to claim 4, characterized in that, The distal balloon also includes a distal tube, which is disposed at the end of the balloon body away from the microcatheter body, and the distal tube is made of a soft polymer material that is opaque and contains a contrast agent.

6. The adjustable-bend high-torque balloon microcatheter according to any one of claims 1-3, characterized in that, The microcatheter body includes two traction wires, which are symmetrically distributed within the microcatheter body.

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