Double-cavity microcatheter capable of accurately positioning pulmonary vessel working guide wire

Abstract

The utility model belongs to the technical field of interventional instruments, and discloses a double-cavity micro catheter capable of accurately positioning the position of a pulmonary vessel working guide wire, which comprises a catheter body and a guide guide wire, and the catheter body is provided with a guide cavity and a working cavity; the guide cavity channel is used for introducing the catheter body into an operation area; the working cavity channel is used for guiding a working guide wire to enter a target blood vessel, two ends are provided with an inlet II and an outlet II, and the outlet II is provided with a developing mark; and the end part of the guide wire is provided with a developing belt with a plurality of strong and weak developing areas with alternate strong and weak developing areas. A mark developing area corresponding to a target blood vessel opening is found through one-time contrast agent injection by arranging a plurality of developing belts with strong and weak developing areas and a developing mark at the position of an outlet II, and then the developing mark at the position of the outlet II corresponds to the mark developing area through X-ray developing, so that working guide wire positioning is realized. The purposes that positioning is completed through one-time radiography and small-amount X-ray development, and the working guide wire is guided to enter a target blood vessel which is difficult to enter are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of interventional devices, especially to the field of positioning catheters for pulmonary vascular intervention, and specifically to a double-lumen microcatheter for accurately positioning the working guide wire of pulmonary vessels. Background Art

[0002] Pulmonary vascular diseases include chronic thromboembolic pulmonary hypertension, pulmonary embolism, pulmonary vasculitis, etc. At present, some pulmonary vascular diseases are treated by interventional surgery, which can achieve good treatment effects. However, the pulmonary vessels have a high degree of curvature and numerous branches. Many pulmonary vascular diseases occur in the branch vessels rather than the main vessels. Therefore, during interventional treatment, not only is it necessary to use X-rays for repeated fluoroscopic guidance, but also it is necessary to repeatedly inject contrast agents to determine the position of the blood vessels. This results in doctors and patients being repeatedly exposed to X-ray irradiation, greatly increasing the X-ray intake dose of patients and doctors; moreover, angiography will also greatly extend the operation time. Even so, it is very difficult for doctors to send the guide wire into the branch vessels of the lungs in one go, especially for pulmonary vessels with large angles, tortuosity, and narrow openings. It often requires repeated attempts, and the operation time is often very long, increasing the risk of the guide wire damaging the blood vessels, and thus increasing the risk of interventional surgery.

[0003] The prior art, the patented technology of a positioning catheter for a pulmonary vascular interventional guiding guide wire with the patent number 202322627738.8, discloses a technical solution for solving the pulmonary vascular positioning problem by setting a positioning sensor. Specifically, it solves the problem of the too-long connecting wire between the sensing plug and the power supply component by setting a rotating storage mechanism to store the connecting wire, and solves the problem of the too-long connecting wire by releasing it during use and storing it when not in use. The above prior art solution has a complex overall structure, and it is necessary to pay attention to the retraction and release of the connecting wire during the operation process.

[0004] Therefore, a device with a reasonable structure and convenient use is needed to solve the problem of accurately inserting the interventional guide wire into the branch blood vessels. In view of the above problems, the utility model provides a double-lumen microcatheter for accurately positioning the working guide wire of pulmonary vessels. Summary of the Utility Model

[0005] Regarding the above-mentioned prior art method of positioning through a positioning sensor, it is an active structure, which makes the preparation of the entire catheter difficult. In addition, the positioning sensor can only achieve positioning at a certain point, and cannot achieve positioning within a range at the branch blood vessel opening.

[0006] The present application provides a catheter body provided with a development mark. The catheter body is provided with an inlet one and an outlet one for guiding a guide wire to enter and exit, and an inlet two and an outlet two for a working guide wire to enter and exit; the development mark is arranged at the positions of the inlet one and the outlet two; in addition, a guiding guide wire with a development band having alternating strong and weak development is provided, and the development band is arranged at the first end of the guiding guide wire. The specific principle is to send the guiding guide wire into the main branch vessel of the pulmonary vessel, then inject a contrast agent and irradiate with X-rays for imaging. On the image, the main branch vessel, the branch vessel to be entered, and the development band entering the main branch vessel can be displayed, and the positional relationship between the development band entering the main branch vessel and the branch vessel can be known. Then, the position of the guiding guide wire is stabilized, and under the action of the guiding guide wire, the catheter body is sent to the branch position. The development band and the development mark are imaged again by X-rays, and the development mark at the position of the outlet two is adjusted to the position of the development band corresponding to the branch vessel. The working guide wire is inserted through this position. This device solves the problem of positioning the working guide wire by setting the development band and the development mark in cooperation, and the positioning is more accurate and rapid. During the process, the number of injections of the contrast agent is effectively reduced. Also, because the development band has the characteristic of having scales, the distance to be adjusted can be understood by estimating the size, greatly reducing the number of X-ray imaging times. The branch vessel is the target vessel to be entered.

[0007] The specific technical solution is a double-lumen microcatheter for accurately positioning the working guide wire in the pulmonary vessel, including a catheter body and a guiding guide wire. The first end of the catheter body is the end that first enters the body, and the second end is the opposite end. A guiding channel and a working channel are arranged on the catheter body;

[0008] The guiding channel is used to send the catheter body into the surgical area through the guiding guide wire, and its two ends are provided with an inlet one and an outlet one, where the inlet one is an opening at the position of the end that first enters the body;

[0009] The working channel is used to guide the working guide wire into the target vessel, and its two ends are provided with an inlet two and an outlet two, where the outlet two is an opening near the first end of the catheter body, and a development mark is arranged at the position of the outlet two;

[0010] The guiding guide wire, the first end is the end that first enters the body, and the opposite end is the second end. A development band with multiple strong and weak development regions with alternating strong and weak is arranged at the position of the first end of the guiding guide wire.

[0011] Further, the guiding channel and the working channel are not connected to each other, and the working channel is a channel arranged near the first end of the catheter body with a length of less than or equal to 50 cm. During use, a working guide wire is inserted into the working channel, and the remaining guiding guide wire is arranged close to the outer wall of the catheter body. Through this setting, it can effectively ensure that the working guide wire is accurately set into the working channel before entering. When the double-lumen micro-guide wire and the guiding guide wire are withdrawn from the body after the working guide wire enters the target blood vessel, there is no need to additionally extend the length of the working guide wire, making the withdrawal of the double-lumen micro-guide wire and the guiding guide wire faster.

[0012] Further, a strong and weak imaging region includes a strong imaging ring with a strong imaging coating and a weak imaging ring without a coating, and the width range of an imaging region is 3-8 mm; 4-10 strong and weak imaging regions are arranged on an imaging band.

[0013] Further, the imaging band further includes a continuous strong imaging region adjacent to multiple strong and weak alternating imaging regions, and the continuous strong imaging region is arranged in the direction away from the first end of the guiding guide wire; by setting the continuous strong imaging region, the accurate identification of the strong and weak imaging regions can be ensured, and errors caused by occlusion can be avoided.

[0014] Further, an imaging mark is set at the position of the first inlet. By setting the imaging mark at the position of the first inlet, it is very convenient to identify the very front end of the catheter body, and another identification position is added; when the imaging mark at the position of the second outlet is not obvious due to occlusion and the position cannot be identified, the position relationship between the first inlet and the marked imaging region can be deduced through the distance relationship between the imaging mark at the position of the first inlet and the second outlet, and then the accurate position of the second outlet can be obtained.

[0015] Further, the included angle range between the direction of the channel part at the position of the second outlet and the longitudinal axis of the catheter body is 30-60 degrees. This angle setting can ensure that the working guide wire is sent into the target blood vessel at a suitable inclination angle to the greatest extent.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] 1. By means of setting an imaging band with multiple strong and weak alternating strong and weak imaging regions on the guiding guide wire and setting an imaging mark at the position of the second outlet, the marked imaging region corresponding to the opening of the target blood vessel can be found, and then the position correspondence between the imaging mark at the position of the second outlet and the marked imaging region can be realized, so that the position of the second outlet corresponds to the inlet of the target blood vessel. When the working guide wire is sent in later, the accuracy of the position where the working guide wire is sent in can be greatly ensured, and the positioning of the working guide wire can be quickly realized. The whole instrument is simple to use and operates smoothly, only requiring one angiography and a few X-ray imaging, greatly reducing the radiation exposure of doctors and patients, and also greatly saving the operation time due to fewer steps.

[0018] 2. By setting the working channel as a channel with a length less than or equal to 50 cm and close to the first end of the catheter body, when the working guide wire is hidden in the working channel, it is possible to more clearly know its penetration depth, avoid the working guide wire from passing out through the second outlet. Furthermore, after the working guide wire is positioned and set in the target blood vessel, when withdrawing the double-lumen micro-guide wire and the guiding guide wire from the body, there is no need to additionally extend the length of the working guide wire, making the withdrawal of the double-lumen micro-guide wire and the guiding guide wire faster.

[0019] 3. By setting a continuous strong imaging area adjacent to multiple strong and weak alternating imaging areas, accurate identification of the strong and weak imaging areas can be ensured, avoiding errors caused by occlusion.

[0020] 4. By setting the angle range between the direction of the channel part at the second outlet and the longitudinal axis of the catheter body to be 30 - 60 degrees, it can ensure that the working guide wire is sent into the target blood vessel at an appropriate inclination angle, which can not only locate the position but also ensure the entry angle, improving the success rate of the working guide wire entering complex blood vessels with large angles, narrow openings, and tortuosities. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model with a guiding guide wire and a working guide wire;

[0023] Figure 2 It is a partial enlarged cross-sectional structure schematic diagram of the first end of the catheter body of the utility model with a guiding guide wire and a working guide wire;

[0024] Figure 3 It is a partial enlarged cross-sectional structure schematic diagram of the second end of the catheter body of the utility model with a guiding guide wire and a working guide wire;

[0025] Figure 4 It is a partial enlarged cross-sectional structure schematic diagram of the first end of the catheter body of the utility model without a guiding guide wire and a working guide wire;

[0026] Figure 5 It is a partial enlarged structure schematic diagram of the first end of the catheter body of the utility model with a guiding guide wire and a working guide wire;

[0027] Figure 6This is a partially enlarged structural schematic diagram of the second end of the catheter body of the present utility model with a guiding wire and a working wire;

[0028] Figure 7 This is a partially enlarged structural schematic diagram of the imaging tape part of the present utility model;

[0029] Figure 8 This is a structural schematic diagram of the first end of the catheter body with a guiding wire and a working wire of the present utility model disposed in a pulmonary blood vessel;

[0030] In the figure: 1. Catheter body; 11. Guiding channel; 111. Entrance 1; 112. Exit 1; 12. Working channel; 121. Entrance 2; 122. Exit 2; 13. Imaging mark; 2. Guiding wire; 21. Imaging tape; 211. Strong and weak imaging regions; 2111. Strong imaging ring; 2112. Weak imaging ring; 212. Continuous strong imaging region; 3. Working wire; 4. Fixed block; 41. Bayonet. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] In this article, "schematic" means "serving as an example, instance, or illustration", and any illustration or implementation manner described as "schematic" in this article should not be construed as a more preferred or more advantageous technical solution.

[0033] To make the drawings concise, only the parts related to the present application are schematically shown in each drawing, and they do not represent the actual structure of the product. Additionally, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown for one of them, or only one of them is labeled.

[0034] In this article, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more; the terms "connection", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] Reference Figures 1-7 ; A double-lumen microcatheter for accurately positioning the working guide wire 3 of the pulmonary blood vessel, including a catheter body 1 and a guiding guide wire 2; The first end of the catheter body 1 is the end that first enters the body, and the second end is the opposite end. A guiding channel 11 and a working channel 12 are provided on the catheter body 1; An inlet one 111 and an outlet one 112 are provided at both ends of the guiding channel 11, and the inlet one 111 is the opening at the position of the end that first enters the body; A developing mark 13 is provided at the position of the inlet one 111; An inlet two 121 and an outlet two 122 are provided at both ends of the working channel 12, and the outlet two 122 is the opening at the position close to the first end of the catheter body 1. A developing mark 13 is provided at the position of the outlet two 122; The guiding guide wire 2, the first end is the end that first enters the body, and the opposite end is the second end. A developing tape 21 with multiple strong and weak alternating strong and weak developing regions 211 is provided at the first end position of the guiding guide wire 2. The end of the first end of the catheter body 1 is blunt.

[0036] The developing tape 21 further includes a continuous strong developing region 212 adjacent to multiple strong and weak alternating developing regions. The continuous strong developing region 212 is arranged in the direction away from the first end of the guiding guide wire 2; By setting the continuous strong developing region 212, it is more convenient to know the position of the branch blood vessel opening, the first end of the guiding guide wire 2 can start to record a specific developing region, or a specific developing region can be recorded starting from one side of the continuous strong developing region 212; By setting the continuous strong developing region 212, the accurate identification of the strong and weak developing regions 211 can be ensured, and the error caused by occlusion can be avoided.

[0037] The guiding guide wire 2 is preferentially inserted into the main blood vessel in the surgical area, and X-ray imaging is performed together with the blood vessels in the surgical area into which the contrast agent is injected. The developing tape 21 and the blood vessel conditions at the surgical site are imaged in the image, and the corresponding relationship between the opening of the branch blood vessel to be operated and the strong and weak developing regions 211 of the developing tape 21 is understood. The strong and weak developing region 211 corresponding to the opening of the branch blood vessel is defined as the marked developing region; Then, the catheter body 1 with the working guide wire 3 is sent into the surgical area through the guiding guide wire 2. Through one irradiation, the positional relationship between the developing mark 13 at the position of the outlet two 122 and the marked developing region is understood. If the developing mark 13 corresponds to the marked developing region in position, the working guide wire 3 is extended into the branch blood vessel. If the existing mark does not correspond to the marked developing region in position, the distance of the positional difference is understood, and the catheter body 1 is advanced or retracted to make the developing mark 13 correspond to the marked developing region in position. After the correspondence, the working guide wire 3 is pushed into the branch blood vessel. Reference Figure 8 , and its state diagram of setting the double-lumen microcatheter into the main branch blood vessel and branch blood vessel of the pulmonary blood vessel.

[0038] By setting a developing mark 13 at the position of the first inlet 111, the very front end of the catheter body 1 can be very conveniently identified, and another identification position is added; when the developing mark 13 at the position of the second outlet 122 is not obvious due to occlusion at the position of the second outlet 122, resulting in the inability to identify the position, the positional relationship between the first inlet 111 and the marked developing area can be deduced from the distance relationship between the developing mark 13 at the position of the first inlet 111 and the second outlet 122, and thus the accurate position of the second outlet 122 can also be obtained.

[0039] The specific implementation manner for the strong and weak developing regions 211 is as follows: Refer to Figure 7 ; One strong and weak developing region 211 includes a strong developing ring 2111 with a strong developing coating and a weak developing ring 2112 without a coating. The width range of one developing region is 3 - 8 mm; 4 - 10 strong and weak developing regions 211 are provided in one developing band 21. Preferably, the width of one developing region is 5 mm; among them, the width of the strong developing ring 2111 is 3 mm; the width of the weak developing ring 2112 is 2 mm; 6 strong and weak developing regions 211 are provided. Through the setting of such strong and weak developing regions 211, the setting requirements of most main pulmonary blood vessels and branch blood vessels can be met. Ensure that one strong and weak developing region 211 penetrates into the main pulmonary blood vessel, and a part of the strong and weak developing regions 211 corresponds to the blood vessel openings of the branch blood vessels, ensuring that a marked developing region can be found corresponding to the branch blood vessel opening and ensuring the completion of subsequent positioning operations. The total length of multiple strong and weak developing regions 211 is 3 cm, and the total length of the continuous strong developing region 212 is 2 cm; through this kind of setting, the positioning of most branch blood vessels can be satisfied, and the accurate guidance of the working guide wire 3 can be completed.

[0040] A more preferred implementation manner is as follows: Refer to Figure 5 ; The implementation manner of setting the developing marks 13 at the position of the first inlet 111 and the position of the second outlet 122 is specifically that the developing marks 13 at the position of the first inlet 111 and the position of the second outlet 122 are both strong developing coatings, and a circular developing structure with a width of 2 - 3 mm is provided around the peripheries of the first inlet 111 and the second outlet 122. Through the setting of such a circular developing structure, an accurate developing range can be obtained during X-ray imaging, rather than just the imaging of a single point, increasing the corresponding effect of positioning.

[0041] A more preferred implementation manner is as follows: Refer to Figure 4; The guiding channel 11 and the working channel 12 are not in communication with each other, and the working channel 12 is a channel provided near the first end of the catheter body 1 with a length less than or equal to 50 cm. Preferably, the length of the working channel 12 is set to 30 cm; during use, a working guide wire 3 is inserted into the working channel 12, and the remaining guiding guide wire 2 is arranged close to the outer wall of the catheter body 1. Through this setting, it can effectively ensure that the working guide wire 3 is accurately set into the working channel 12 before entering. When the double-lumen micro-guide wire and the guiding guide wire 2 are withdrawn from the body after the working guide wire 3 enters the branch blood vessel, there is no need to additionally extend the length of the working guide wire 3, making the withdrawal of the double-lumen micro-guide wire and the guiding guide wire 2 faster.

[0042] A more preferred embodiment is that, because there is a certain inclination angle between the branch blood vessel and the main pulmonary blood vessel, if the outlet two 122 is set perpendicular to the longitudinal axis of the catheter body 1, there will be a problem that even if the position of the blood vessel outlet is located, the working guide wire 3 cannot be accurately pushed out. Refer to Figure 4 ; The included angle range between the direction of the channel part at the position of the outlet two 122 and the longitudinal axis of the catheter body 1 is 30 - 60 degrees. This kind of angle setting can ensure to the greatest extent that the working guide wire 3 is sent into the branch blood vessel at a suitable inclination angle, facilitating the angle adjustment when the working guide wire 3 enters and accurately entering the branch blood vessel.

[0043] A more preferred embodiment is that, because a large part of the working guide wire 3 enters the surgical area by adhering to the outer side of the catheter body 1, if the operator himself completes the action of pressing the working guide wire 3 against the catheter body 1, it will consume a lot of energy of the operator. Therefore, the following settings are made: Refer to Figure 6 ; A fixing structure for the working guide wire 3 is also provided on the catheter body 1. The fixing structure is a fixing block 4 with 1 - 2 clamping openings 41, and the clamping openings 41 penetrate through the fixing block 4. Preferably, the distance between the fixing block 4 and the end of the second end of the catheter body 1 is greater than 2 cm and less than 10 cm. This kind of position setting can ensure that the working guide wire 3 can be quickly clamped into the clamping opening 41 and also facilitate the separation of the working guide wire 3 from the clamping opening 41. More preferably, the opening width of the clamping opening 41 is smaller than the diameter of the working guide wire 3, but the diameter of the clamping opening 41 is equal to the diameter of the working guide wire 3. This kind of setting can ensure that the working guide wire 3 is stably set in the opening.

[0044] The specific application of a double-lumen microcatheter for accurately positioning the position of the working guide wire 3 in the pulmonary blood vessel during the interventional surgery for pulmonary artery stenosis.

[0045] Chronic thromboembolic pulmonary hypertension (CTEPH) refers to a clinical and pathophysiological syndrome in which unabsorbed acute thrombi are organized to form a reticular structure of chronic thrombi that block the pulmonary artery or its branches, causing pulmonary circulation disorders. Other diseases such as arteritis, parasites, tumors, fibrous mediastinitis, etc. can all lead to pulmonary artery stenosis and require pulmonary artery interventional treatment.

[0046] The treatment of chronic thromboembolic pulmonary hypertension includes the following main methods: surgical pulmonary endarterectomy (PEA), balloon pulmonary angioplasty (BPA), and drug therapy.

[0047] Balloon pulmonary angioplasty is suitable for patients with chronic thromboembolic pulmonary hypertension, especially those who are unwilling or unable to undergo surgical pulmonary endarterectomy. Balloon pulmonary angioplasty has less trauma and high efficiency, but has higher requirements for interventional operations. And the branch vessels of the diseased pulmonary artery often become tortuous, deformed, and stenotic at the opening. Conventional wire operations are often difficult to enter the target vessel, and there may be a risk of the wire piercing the blood vessel.

[0048] Based on balloon pulmonary angioplasty, the present application provides a double-lumen microcatheter for accurately positioning the working wire 3 of the pulmonary blood vessel. During the operation, the patient lies supine, the puncture site is routinely disinfected and locally anesthetized, and the catheter body 1 is inserted through the right femoral vein puncture.

[0049] The specific operation steps are as follows: 1) Insert the guiding wire 2 into the main branch vessel under the guidance of an X-ray imaging device.

[0050] 2) Inject contrast agent, and then irradiate with X-rays to visualize the relationship between the strong and weak imaging regions 211 of the guiding wire 2 and the position of the branch vessel to be treated. Define the strong and weak imaging region 211 corresponding to the vascular opening of the branch vessel as the marked imaging region.

[0051] 3) Place a section of the working wire 3 in the working channel 12, but the working wire 3 does not extend out of the second outlet 122. The remaining working wire 3 is attached to the outer side wall of the working wire 3, and the tail end is clamped into the bayonet 41 of the fixing block 4 to fix the working wire 3.

[0052] 4) Introduce the microcatheter with the working wire 3 into the operation area along with the guiding wire 2, and then visualize the imaging mark 13 at the position of the strong and weak imaging region 211 of the guiding wire 2 and the second outlet 122 by X-ray imaging, and know the positional relationship between the marked imaging region and the imaging mark 13 at the position of the second outlet 122. If the two positional relationships directly correspond, push out the working wire 3. If there is a deviation, adjust the position of the catheter body 1 according to the deviation distance. Finally, make the marked imaging region correspond to the position of the second outlet 122, and after correspondence, push out the working wire 3 into the branch vessel.

[0053] 5) After the working wire 3 is sent into the branch vessel from the second outlet 122, withdraw the guiding wire 2 and the microcatheter from the working wire 3. Because there is only one section of the working channel 12, the guiding wire 2 and the microcatheter can be withdrawn from the working wire 3 without being able to extend the length of the branch wire when withdrawing.

[0054] 6) Then, other relevant instruments are fed along the working guide wire 3 to treat the branch vessel site.

[0055] 7) After the treatment is completed, the working guide wire 3 is withdrawn, and the puncture site is hemostatic and bandaged under pressure.

[0056] As described above, it is only the specific implementation manner of the present application. Under the above teaching of the present application, those skilled in the art can make other improvements or deformations on the basis of the above embodiments. Those skilled in the art should understand that the above specific description is only a better explanation of the purpose of the present application, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A double-lumen microcatheter for accurately locating the position of a pulmonary vascular working guidewire, comprising: The catheter body has a first end that enters the body first and a second end that is an opposite end, and a guide cavity and a working cavity are provided on the catheter body; A guide cavity is used to introduce the catheter body into the surgical area through the guide wire, and an inlet 1 and an outlet 1 are arranged at both ends of the guide cavity, wherein the inlet 1 is an opening at one end of the body that first enters the body; A working lumen is used to guide the working guide wire into the target blood vessel. An inlet 2 and an outlet 2 are arranged at both ends of the working lumen. The outlet 2 is an opening close to the first end of the catheter body. A developing mark is arranged at the outlet 2. The guide wire has a first end that enters the body first and an opposite end that is a second end. A developing belt with a plurality of alternating strong and weak developing areas is arranged at the first end of the guide wire.

2. The double-lumen microcatheter according to claim 1, characterized in that: The guiding cavity and the working cavity are not connected to each other, and the working cavity is a cavity with a distance less than or equal to 50 cm. The working cavity is arranged in the cavity close to the first end of the catheter body.

3. The double-lumen microcatheter according to claim 2, characterized in that: The length of the working cavity is set to 30 cm.

4. The double-lumen microcatheter according to claim 1, characterized in that: A strong and weak development area includes a strong development ring with a strong development coating and a weak development ring without a coating.

5. The double-lumen microcatheter according to claim 4, characterized in that: The width of a developing area ranges from 3 to 8 mm, and a developing belt is provided with 4 to 10 strong and weak developing areas.

6. The double-lumen microcatheter according to claim 4, characterized in that: The width of a developing area is 5 mm; the width of the strong developing ring is 3 mm; the width of the weak developing ring is 2 mm, and 6 strong and weak developing areas are set.

7. The double-lumen microcatheter according to claim 4, characterized in that: The developing belt also includes a continuous strong developing area adjacent to a plurality of strong and weak alternating developing areas, and the continuous strong developing area is arranged in a direction away from the first end of the guide wire.

8. The double-lumen microcatheter according to claim 1, characterized in that: A developing mark is set at the entrance one position, and the developing marks at the entrance one position and the exit two position are both strong developing coatings, and a 2-3mm wide annular developing structure is set around the periphery of the entrance one and the exit two.

9. The double-lumen microcatheter according to any one of claims 1 to 8, characterized in that: The angle between the direction of the cavity portion at the second outlet position and the longitudinal axis of the catheter body is in the range of 30-60 degrees.

10. The double-lumen microcatheter according to any one of claims 1 to 8, characterized in that: A working guide wire fixing structure is arranged on the catheter body. The fixing structure is a fixing block with 1-2 bayonet holes. The bayonet holes penetrate the fixing block. The distance between the fixing block and the second end of the catheter body is greater than 2 cm and less than 10 cm.

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