Mapping micro catheter for nerve interventional operation

Abstract

The application provides a markable microcatheter for neurointerventional surgery, comprising: a main body tube having a distal end for going deep into the body of a patient and a proximal end opposite to the distal end, a catheter channel being arranged in the main body tube, the hardness of the main body tube being gradually increased in the direction from the distal end to the proximal end; the at least six developing parts are uniformly arranged in the axial direction of the far end of the main body tube along a preset mapping distance, and the preset mapping distance is 4-6 mm; through the at least six developing parts, the main body tube is developed when entering the tumor opening position of the aneurysm cavity so as to map the width of the tumor opening. The problem that in the prior art, a micro catheter cannot map the width of a tumor opening is solved. Meanwhile, the device can also be used for measuring the lengths of narrow and closed sections during thrombolysis and thrombectomy, and accurate selection of thrombectomy stents and narrow stents is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of aneurysm embolization surgical instruments, and more specifically, to a mappable microcatheter for neurointerventional surgery. Background Art

[0002] Neurointerventional technology, also known as neurovascular interventional technology, refers to the technology of diagnosing or treating head and neck and spinal cord lesions through vascular or percutaneous puncture with the support of medical imaging equipment such as digital subtraction angiography (DSA) system. Cerebrovascular disease has become a major disease that endangers the health and life of middle-aged and elderly people. According to the cause, cerebrovascular diseases can be divided into two categories: hemorrhagic and ischemic. The cause of ischemic stroke is generally intracranial artery stenosis; the common causes of hemorrhagic stroke are generally intracranial aneurysms and cerebral arteriovenous malformations. Among them, intracranial aneurysms are one of the most serious hemorrhagic cerebrovascular diseases. After the aneurysm ruptures, the condition is dangerous and develops rapidly, with extremely high mortality and disability rates. The main treatment options for intracranial aneurysms are open surgery, interventional therapy and drug therapy. Before the development of interventional medicine, open surgery was the main treatment for intracranial aneurysms. However, open surgery is prone to intracranial infection, has many complications, and has certain risks. The results of the ISAT study showed that endovascular embolization is more effective than open surgery in treating intracranial aneurysms; the results of the BRAT study also showed that endovascular coil embolization is more effective than open surgery. Currently, the main methods of endovascular interventional treatment are coil embolization and blood flow-guided dense mesh stent implantation.

[0003] Coil embolization is a procedure that uses microcatheter technology to deliver coils into the aneurysm cavity. The coils will cause eddy currents when blood flows into the aneurysm, and the blood flow rate will continue to slow down. Eventually, the blood flow rate will be in a state of basic stagnation, thus forming a thrombus. The pressure inside the aneurysm is therefore significantly reduced, reducing the possibility of aneurysm rupture and avoiding life-threatening conditions. Coil embolization is suitable for intracranial aneurysms that are at risk of rupture, and has good immediate effects after surgery. When coil embolization is performed on intracranial wide-necked aneurysms at the bifurcation, it has become a difficult point in the field of interventional treatment of cerebrovascular diseases due to the wide neck of the aneurysm and the involvement of important branch vessels. In the process of placing coils into the aneurysm, in order to prevent the coils from coming out through the aneurysm ostium, a blood flow guide device is needed to block the aneurysm ostium so that the coils cannot escape into the normal tumor-bearing vessels and branch vessels. Therefore, the width of the aneurysm ostium determines the length of the selected blood flow guide device.

[0004] Currently, the function of the microcatheter in neurointerventional surgery is only to serve as a channel to implant the elastic coil into the inner cavity of the aneurysm (mechanical release of the spring coil), and the radiopaque marker on the microcatheter only serves as a direction marker for the distal end of the microcatheter, so that the doctor can identify the direction of the head end of the microcatheter during the operation. Therefore, the existing microcatheter cannot mark the width of the aneurysm opening, which is not conducive to the operator's rapid selection of the specifications of the blood flow guidance device, is not convenient for the operation, and leads to low surgical efficiency.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] The purpose of the present application is to provide a mappable microcatheter for neurointerventional surgery, which solves the problem that the microcatheter in the prior art cannot map the width of the tumor opening, which is not conducive to the operator's rapid selection of the specifications of the blood flow guidance device.

[0007] To achieve the above purpose, the technical solution adopted in this application is:

[0008] The present application provides a mappable microcatheter for neurointervention surgery, comprising:

[0009] The main body tube has a distal end for penetrating into the patient's body and a proximal end opposite to the distal end, a catheter channel is arranged in the main body tube, and the hardness of the main body tube gradually increases from the distal end to the proximal end;

[0010] At least 6 developing members, at least 6 developing members are evenly arranged along a predetermined marking distance in the axial direction of the distal end of the main tube, and the predetermined marking distance is 4-6 mm;

[0011] At least 6 developing parts are used to allow the main tube to enter the aneurysm cavity and perform development to mark the width of the aneurysm.

[0012] In an optional embodiment, the main body tube comprises: an inner tube, the catheter channel is opened in the inner tube, and the developing member is arranged on the outer wall of the inner tube;

[0013] The outer tube is sleeved on the inner tube and wraps the developing part.

[0014] In an optional embodiment, the outer tube includes a polyamide polyether block polymer nylon tube, and the polyamide polyether block polymer nylon tube has a gradually decreasing hardness from the distal end to the proximal end.

[0015] In an optional embodiment, the main body tube further includes: an intermediate elastic layer, and the intermediate elastic layer is sleeved on the inner layer tube.

[0016] In an optional embodiment, the middle elastic layer includes springs or a woven mesh;

[0017] The middle elastic layer is a stainless steel wire elastic layer or a nickel-titanium wire elastic layer.

[0018] In an optional embodiment, the middle elastic layer covers the entire inner tube from the proximal end to the distal end.

[0019] In an optional embodiment, the distal end of the main tube has a shaping section, and the shaping section is used for steam shaping to match the shape of the patient's blood vessels.

[0020] In an optional embodiment, a hydrophilic coating is provided on the outer surface of the distal end of the main body tube.

[0021] In an optional embodiment, an orifice is provided on the distal side of the main tube, and the orifice is communicated with the catheter channel.

[0022] In an optional embodiment, the mapping microcatheter further includes: a catheter seat, the catheter seat is connected to the proximal end of the main tube, and a connecting joint is provided on the catheter seat;

[0023] In an optional embodiment, the connecting joint is an internal conical locking joint;

[0024] In an optional embodiment, the mappable microcatheter further includes a diffusion stress tube, which is sleeved on the proximal end of the main tube and the catheter seat.

[0025] In an optional embodiment, the predetermined marking distance is 5 mm.

[0026] The beneficial effect of a mappable microcatheter for neurointerventional surgery provided by the present application is at least that: by using 6 developing rings at the distal end of the main tube with equal predetermined mapping distance, the predetermined mapping distance is 4-6mm, so that it is convenient for doctors to use 6 developing rings and predetermined mapping distance to map the width of the tumor opening, and it is convenient for the operator to quickly select a blood flow guide device of appropriate length according to the mapped width of the tumor opening, so that the blood flow guide device can stably block the tumor opening, thereby preventing the released spring coil from escaping from the tumor opening to the normal tumor-bearing blood vessel and branch blood vessel. By setting the main tube to have a gradual hardness change from the distal end to the proximal end, during the process of the main tube passing through the blood vessel, the hardness of the distal end of the main tube is low, so that it can be deformed according to the contour of the blood vessel, so that the main tube passes more smoothly in the blood vessel, and the hardness of the proximal end of the main tube is high, which can achieve stable support in the blood vessel, so that the main tube remains stable as a whole in the blood vessel and its position is not easy to change. Through the catheter channel in the main tube, embolization stent spring coils and the like can be delivered to the aneurysm. Therefore, through the design of the head end wall hole of the main tube and the six imaging parts with predetermined distances, the functions of delivering stent coils, embolic materials, and liquid medicine can be realized, and the convenience and accuracy of the operator's selection of the specifications of the blood flow guide device can be greatly improved, thereby improving the efficiency of the operation. At the same time, it can also be used to measure the length of the stenosis and occlusion segments during thrombolysis and thrombectomy, which is conducive to the accurate selection of thrombectomy stents and stenosis stents. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the structure of a mappable microcatheter for neurointerventional surgery provided in an embodiment of the present application when used in a blood vessel;

[0029] Figure 2 A schematic diagram of the overall structure of a mappable microcatheter for neurointerventional surgery provided in an embodiment of the present application;

[0030] Figure 3 A cross-sectional view of a distal end of a first structure of a main body tube of a mapping microcatheter for neurointerventional surgery provided by an embodiment of the present application;

[0031] Figure 4 A cross-sectional view of the distal end of a second structure of a main body tube of a mapping microcatheter for neurointerventional surgery provided in an embodiment of the present application;

[0032] Figure 5 A cross-sectional view of the distal end of a third structure of the main body tube of a mappable microcatheter for neurointerventional surgery provided in an embodiment of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 10. Markable microcatheter; 100. Main tube; 110. Inner tube; 111. Catheter channel; 112. Opening; 120. Middle elastic layer; 130. Outer tube; 140. Shaping section; 150. Hydrophilic coating; 160. Development piece; 170. Orifice; 200. Catheter seat; 210. Connecting joint; 300. Diffusion stress tube; 20. Stent coil; 30. Aneurysm; 31. Aneurysm opening. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] See also Figure 1 This embodiment provides a mappable microcatheter 10 for neurointerventional surgery, which is used in nerve and blood vessel coil embolization, and is mainly used to place a stent coil 20 in the cavity of an aneurysm 30. Figure 1 , Figure 2 The mapping microcatheter 10 mainly includes: a main tube 100 and at least 6 developing parts 160. The main tube 100 is usually a round tube, and has a distal end and a proximal end in the axial direction of the main tube 100. When the operator performs the operation, the distal end is the end that is away from the operator and penetrates into the surgical site in the patient's body, and the proximal end is the end opposite to the distal end and is operated outside the patient's body. Figure 2-Figure 5A catheter channel 111 is provided in the main tube 100. The catheter channel 111 can penetrate the main tube 100 along the axial direction. The opening 112 of the catheter channel 111 is located in the axial direction of the distal end. When the main tube 100 extends into the inner cavity of the aneurysm 30, the stent coil 20 and the like can be delivered to the aneurysm 30 through the catheter channel 111 in the main tube 100. The stent coil 20 is delivered into the aneurysm 30 cavity in the catheter channel 111. The stent coil 20 will cause eddy currents to be generated when blood flows into the aneurysm 30. The blood flow velocity continues to slow down, and eventually the blood flow velocity will be in a basically stagnant state, thereby forming a thrombus, thereby significantly reducing the pressure in the inner cavity of the aneurysm 30 and reducing the possibility of rupture of the aneurysm 30. The hardness of the main tube 100 gradually increases from the distal end to the proximal end. Therefore, after the distal end of the main tube 100 enters the blood vessel first, it will pass through a relatively long distance in the blood vessel. Due to the gradual change in hardness, the distal end of the main tube 100 with low hardness can be deformed according to the contour of the blood vessel to make the main tube 100 pass more smoothly in the blood vessel, while the high hardness of the proximal end of the main tube 100 can achieve stable support in the blood vessel, so that the main tube 100 can remain stable as a whole in the blood vessel and its position is not easy to change, so that the entire mappable microcatheter 10 can be stably maintained in the blood vessel, which is convenient for the operation. At least 6 developing parts 160 are evenly arranged along the predetermined mapping distance in the axial direction of the distal end of the main tube 100, and the predetermined mapping distance is 4-6mm. When the main tube 100 is delivered into the inner cavity of the aneurysm 30 through the blood vessel, the distal end of the main tube 100 enters the aneurysm 30, and the section where the six developing members 160 are located will be at the position of the aneurysm 31. By the number of developing members 160 within the width range of the aneurysm 31 and the distance between the developing members 160 is also known, the operator can directly calculate the width of the aneurysm 31, thereby achieving the process of the main tube 100 entering the aneurysm 30. The main tube 100 is implanted in the aneurysm 30 cavity at the position of the aneurysm 31 through at least six developing members 160 to map the width of the aneurysm 31. The number of developing members 160 is relatively large, and the predetermined mapping distance is 4-6 mm, and the spacing distance is also larger, so that when the marking density is relatively appropriate, there is a larger mapping range, which can basically meet the measurement of aneurysms 31 of various specifications, making the mapping microcatheter 10 more practical.

[0038] The present embodiment is a markable microcatheter 10 for neurointerventional surgery. Six developing parts 160 are provided at the distal end of the main tube 100 at a predetermined marking distance of 4-6 mm. This makes it easy for doctors to use the six developing rings and the predetermined marking distance to mark the width of the tumor ostium 31, and it is easy for the operator to quickly select a blood flow guiding device of a suitable length according to the measured width of the tumor ostium 31, so that the blood flow guiding device can stably block the tumor ostium 31, thereby preventing the released spring coil from escaping from the tumor ostium 31 to the normal tumor-bearing blood vessels and branch blood vessels, greatly improving the convenience and accuracy of the operator in selecting the specifications of the blood flow guiding device, thereby improving the efficiency of the operation.

[0039] See also Figure 1 , Figure 2 Furthermore, the specific number of the developing parts 160 in this embodiment is 6, and the predetermined mapping distance is specifically 5 mm. The setting form of this specification has the best mapping effect. The diameter of the aneurysm 30 that usually needs surgery is more than 5 mm. When the operator moves the main tube 100 for mapping, one end of the aneurysm 31 in the width direction can be aligned with one of the 6 developing parts 160, and the other end of the aneurysm 31 in the width direction can be visually observed between or on which developing parts 160 the other end is located, so that the size of the aneurysm 31 can be visually measured. The layout of the developing parts 160 has good actual measurement effect and excellent performance.

[0040] The mapping microcatheter 10 can also be used to measure the length of the stenosis and occlusion segments during thrombolysis and thrombectomy, which is conducive to the accurate selection of the thrombectomy stent and the stenosis stent. When the mapping microcatheter 10 is inserted into the blood vessel, the stenosis and occlusion segments are developed and measured by the six developing parts 160, so that the doctor can intuitively see the specific length of the stenosis and occlusion segments of the blood vessel, thereby providing a reference for the doctor to select the thrombectomy stent and the stenosis stent of the appropriate length, so that the size of the thrombectomy stent and the stenosis stent selected by the doctor is more accurate.

[0041] Furthermore, the main body tube 100 in this embodiment is a non-hydration conduit with a uniform inner diameter, and can be of the following two structures:

[0042] See also Figure 1 , Figure 2 , Figure 3The first structure of the main tube 100 specifically includes: an inner tube 110 and an outer tube 130. The catheter channel 111 is opened in the inner tube 110, and as the main supporting structure, the micro-catheter 10 that can be marked maintains a round tube shape. The inner tube 110 can be made of polytetrafluoroethylene (PTFE), which is easy to manufacture. The inner tube 110 formed has good stability. The inner tube 110 can also be made of other polymer materials such as nylon. The inner diameter of the catheter channel 111 of the inner tube 110 is uniform. The outer tube 130 is sleeved on the inner tube 110 and wraps the developing part 160. The inner tube 110 and the developing part 160 are covered by the outer tube 130, so that the fixing of the developing part 160 on the inner tube 110 is more stable, and it is prevented from falling off and remaining in the patient's body. The developing part 160 is usually a metal part, and the outer tube 130 can also protect the metal part, for example, to improve the ability of corrosion resistance and oxidation resistance.

[0043] The outer tube 130 specifically includes a polyamide polyether block polymer nylon tube, and the polyamide polyether block polymer nylon tube has a gradually increasing hardness in the direction from the distal end to the proximal end. In the specific structure, the polyamide polyether block polymer nylon tube is a polymer material that combines polyamide polyether block polymer (Pebax) and nylon; the polymer material forms an outer tube 130 with a gradually increasing hardness through a manufacturing process, for example, the distribution of the polyamide polyether block polymer in the polymer material on the nylon can be made in the form of different densities to achieve different hardnesses, and the density of the polyamide polyether block polymer in the direction from the distal end to the proximal end gradually increases. Such an outer tube 130 realizes variable hardness in the axial direction, so the main tube 100 combined with the inner tube 110 gradually increases hardness in the direction from the distal end to the proximal end.

[0044] In addition, the outer tube 130 may also be a medical polymer material combining polyamide polyether block polymer and PU, a medical polymer material combining PU and nylon, and the like.

[0045] See also Figure 1 , Figure 2 , Figure 4The second structure of the main tube 100 specifically includes: an inner tube 110, an intermediate elastic layer 120 and an outer tube 130. On the basis of the first structure, the intermediate elastic layer 120 is added. The intermediate elastic layer 120 is sleeved on the inner tube 110, and the developing member 160 is fixed on the intermediate elastic layer 120 and the inner tube 110, so that the outer tube 130 is sleeved on the intermediate elastic layer 120 of the inner tube 110 and wraps the developing member 160. The intermediate elastic layer 120, as a structural reinforcement, plays a structural reinforcement role in strengthening the strength and rigidity of the main tube 100, and enables the main tube 100 to produce adaptive deformation in the blood vessel according to the contour shape of the blood vessel, so that it can smoothly pass through the bends or corners of the blood vessel after deformation, and realize that the main tube 100 can rebound and restore after bending and deformation. The developing member 160 can be a developing ring, such as a platinum-iridium alloy ring, which has a good performance effect on the developing image, and the image is clearer and more accurate. The developing ring can be bonded and fixed to the outer wall of the inner tube 110 and the middle elastic layer 120 , thereby realizing the connection between the developing member 160 and the main tube 100 .

[0046] The middle elastic layer 120 is a metal elastic layer, for example, a stainless steel wire elastic layer or / and a nickel-titanium wire elastic layer. The elastic layer formed by stainless steel or nickel-titanium wire has the advantages of being not easy to rust and having good structural stability. The metal elastic layer can also be other alloy materials. In the specific structure, alloy materials are used to form springs and / or braided meshes. The middle layer formed by the springs and braided meshes has good resilience and strong practicality. For example, a spring wound by stainless steel wire is conveniently sleeved on the inner tube 110 to ensure the stability of the connection.

[0047] The outer tube 130 covers the middle elastic layer 120 and the developing member 160 to form a three-layer composite structure, so that the middle elastic layer 120 and the developing member 160 are more stably fixed on the inner tube 110 to prevent them from falling off; the main tube 100 has good deformability and high structural strength.

[0048] Furthermore, the middle elastic layer 120 in this embodiment covers the entire inner tube 110 from the proximal end to the distal end. For example, a spring is wound all over the outer wall of the inner tube 110, so that the structure of the entire main tube 100 at each position in the axial direction is strengthened, so that the main tube 100 can still maintain the inner cavity during long-term treatment, which is convenient for surgery.

[0049] See also Figure 2 Further, based on the above structure of the main tube 100, the distal end of the main tube 100 has a shaping section 140, which is used for steam shaping to match the shape of the patient's blood vessels, and the shaping section 140 can completely cover the distribution area of ​​the six developing parts 160. The shaping section 140 facilitates the operator to steam shape the distal end of the main tube 100 as needed before the operation.

[0050] See also Figure 4 Further, a hydrophilic coating 150 is provided on the outer surface of the distal end of the main body tube 100. The hydrophilic coating 150 is coated within a predetermined range of the outer surface of the distal end, and the hydrophilic coating 150 can reduce friction when the main body tube 100 passes through the blood vessel.

[0051] See also Figure 1-Figure 4 Further, an orifice 170 is provided on the distal side of the main tube 100, and the orifice 170 is connected to the catheter channel 111. The orifice 170 on the side of the head end can be opened along the radial direction of the main tube 100, so as to be staggered with the axial opening 112 on the catheter channel 111 on the end surface. During the operation, embolic substances, liquid medicine, etc. can be delivered to the aneurysm 30 through the orifice 170 on the side, such as perfusing thrombolytic drugs. The orifice 170 on the side can allow the drug to be dispersed into the inner cavity of the aneurysm 30 from the side, and the drug diffusion range is large, the drug delivery speed is fast, and the efficiency is high.

[0052] See also Figure 2 , Figure 5 Furthermore, a plurality of orifices 170 may be provided, for example, symmetrically provided on both sides of the radial direction on the main tube 100, so as to make the drug diffusion efficiency higher.

[0053] In another structure, the orifice 170 is opened obliquely to the radial direction of the main tube 100, and the liquid outlet direction of the orifice 170 forms a certain obtuse angle with the liquid outlet direction of the axial opening 112, thereby expanding the diffusion range of the drug and further improving the efficiency.

[0054] In another scheme, during the use of the orifice 170, the inclined orifice 170 can also exert a certain impact on the edge of the orifice 31 by injecting drugs when the main tube 100 enters the position of the orifice 31, thereby deforming the relatively thin part of the edge of the orifice 31, and facilitating the formation of a new edge of the orifice 31 in the non-deformed area. The tissue structure of the edge of the orifice 31 formed in this way is more stable, and the blood flow guiding device selected after measurement has better matching with the orifice 31. The selection of the blood flow guiding device can be matched with the relatively thick part of the edge of the orifice 31 that is not impacted, so as to avoid the blood flow guiding device from easily slipping out of the orifice 31 during the operation because it abuts against the relatively thin part of the edge of the orifice 31. By adopting the method of opening the inclined orifice 170 on both sides, the impact force can be formed on both sides of the width direction of the orifice 31, so that the impact force on the edge of the orifice 31 is uniform, the deformation of the orifice 31 is also relatively uniform, and the measured area of ​​the orifice 31 that can actually carry the blood flow guiding device is more accurate.

[0055] See also Figure 1 , Figure 2Furthermore, the markable microcatheter 10 in this embodiment also includes: a catheter seat 200, the catheter seat 200 is connected to the proximal end of the main tube 100, and a connecting joint 210 is provided on the catheter seat 200. The catheter seat 200 is connected to the main tube 100 with UV glue, fixed by light curing, and is not easy to fall off. And the connecting joint 210 on the catheter seat 200 is used to connect the valve, and the amount of embolic material and liquid medicine delivered from the orifice 170 to the aneurysm 30 is controlled by the switch of the valve. The connecting joint 210 can be an inner cone locking joint. The inner cone locking joint has good leak-proof performance, is easy to dock with standard parts, and has strong practicality.

[0056] See also Figure 1 , Figure 2 Furthermore, the mapping microcatheter 10 of this embodiment further includes a diffusion stress tube 300, which is sleeved on the proximal end of the main tube 100 and the catheter seat 200. The diffusion stress tube 300 is at the distal end of the main tube 100. Since the main tube 100 is long, the part extending into the patient's blood vessel during surgery is relatively long, and the stress is concentrated at the distal end of the main tube 100. By adding the diffusion stress tube 300, the stress at the end of the main tube 100 is dispersed to avoid stress concentration, prevent the main tube 100 from breaking at the end, and ensure the stability of the main tube 100 when in use.

[0057] In summary, the present application provides a markable microcatheter for neurointerventional surgery, which is provided with 6 platinum-iridium alloy developing rings starting from the head end, with an interval of 5mm, fixed on the inner layer and the spring, and coated in the polymer outer layer, so that the doctor can use these multiple developing rings to mark the width of the tumor opening, so as to select a blood flow guiding device of appropriate length, so as to avoid the released spring coil from escaping from the tumor opening to the normal tumor-bearing blood vessels and branch blood vessels; the head end has a side hole, through which embolic substances, medical solutions, etc. can be delivered to the aneurysm; the head end is soft and shapeable, which is convenient for the doctor to complete steam shaping according to the situation; the tube body is wound with springs, and the inner cavity can still be maintained during long-term treatment; the outer surface of the catheter is coated with a hydrophilic coating within a certain range at the distal end, which can reduce friction during use.

[0058] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A mappable microcatheter for neurointerventional surgery, characterized in that: include: A main body tube, the main body tube having a distal end for penetrating into a patient's body and a proximal end opposite to the distal end, a catheter channel being arranged in the main body tube, and the hardness of the main body tube gradually increases from the distal end to the proximal end; At least 6 developing members, at least 6 developing members are evenly arranged along a predetermined marking distance in the axial direction of the distal end of the main tube, and the predetermined marking distance is 4-6 mm; The main tube is entered into the aneurysm cavity by at least 6 developing parts to develop the aneurysm opening and measure the width of the aneurysm opening.

2. The mappable microcatheter for neurointerventional surgery according to claim 1, characterized in that: The main body tube comprises: an inner tube, the conduit channel is opened in the inner tube, and the developing member is arranged on the outer wall of the inner tube; An outer tube is sleeved on the inner tube and wraps the developing component.

3. The mappable microcatheter for neurointerventional surgery according to claim 2, characterized in that: The outer tube comprises a polyamide polyether block polymer nylon tube, and the polyamide polyether block polymer nylon tube has a gradually increasing hardness along the direction from the distal end to the proximal end.

4. The mappable microcatheter for neurointerventional surgery according to claim 2, characterized in that: The main body tube further comprises: an intermediate elastic layer, and the intermediate elastic layer is sleeved on the inner layer tube.

5. The mappable microcatheter for neurointerventional surgery according to claim 2, characterized in that: The middle elastic layer includes a spring elastic layer and / or a woven mesh elastic layer.

6. The mappable microcatheter for neurointerventional surgery according to claim 1, characterized in that: The distal end of the main body tube has a shaping section, and the shaping section is used for steam shaping to match the shape of the patient's blood vessels.

7. The mappable microcatheter for neurointerventional surgery according to claim 1, characterized in that: A hydrophilic coating is disposed on the outer surface of the distal end of the main body tube.

8. The mappable microcatheter for neurointerventional surgery according to any one of claims 1 to 7, characterized in that: An orifice is arranged on the side of the distal end of the main body tube, and the orifice is communicated with the catheter channel.

9. The mappable microcatheter for neurointerventional surgery according to claim 1, characterized in that: The markerable microcatheter further comprises: a catheter seat, the catheter seat is connected to the proximal end of the main tube, and a connecting joint is provided on the catheter seat; The connecting joint is an internal conical locking joint; The markable microcatheter also includes a diffusion stress tube, which is sleeved on the proximal end of the main tube and the catheter seat.

10. The mappable microcatheter for neurointerventional surgery according to claim 1, characterized in that: The predetermined marking distance is 5 mm.

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