Double-lumen microcatheter with reverse wire guide

Abstract

This invention discloses a dual-lumen microcatheter with a guidewire reverse branch in the coronary artery, comprising: a microcatheter body (4) and a reverse branch cover (1), wherein the microcatheter body (4) includes a main branch lumen (3) and a branch lumen (2), the branch lumen (2) is provided with a catheter outlet (21) and a guidewire shaping lumen (22), the guidewire shaping lumen (22) is located at the distal end of the branch lumen (2), and the catheter outlet (21) is located at the end of the guidewire shaping lumen (22); the reverse branch cover (1) is sleeved on the microcatheter body (4), the reverse branch cover (1) and the microcatheter body (4) are detachably connected, the reverse branch cover (1) covers the peripheral area of ​​the distal end of the microcatheter body (4) in a hood-like shape, and the reverse branch cover (1) can slide along the axial direction of the microcatheter body (4) after being detached; a cover outlet (11) is provided on the reverse branch cover (1). This invention can achieve the goals of guidewires moving at large angles within the coronary artery, preventing guidewire displacement and dislodgement during catheter withdrawal, and adapting the size to the blood vessel.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a double-lumen microcatheter with a guidewire reversal branch in the coronary artery. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] In coronary intervention, when the lesion is located at a bifurcation, especially when the opening of the side branch is severely narrowed and has a large angle, the angle between the side branch and the main branch is greater than or equal to 90°, making it difficult to insert the guidewire into the true lumen of the side branch. To address the challenge of guidewire placement in obtuse-angle bifurcation lesions, current techniques employ either external guidewire shaping or internal guidewire reversal techniques. External guidewire shaping involves the operator bending the free end of the guidewire to a predetermined angle outside the patient's body, then using the bent guidewire tip to conform to the direction of the side branch opening of the double-lumen microcatheter for insertion into the true lumen of the side branch. Internal guidewire reversal utilizes a specially structured microcatheter to change the guidewire angle, thereby allowing it to enter the side branch at a predetermined angle. However, existing in vivo guidewire reverse branch techniques utilize dual-lumen microcatheters that rigidly constrain the guidewire. During catheter withdrawal, the guidewire remains continuously restrained by a pre-set shaping force. Even if the guidewire tip is temporarily inserted into the true lumen of the side branch, the section of the guidewire already inside the side branch vessel will experience a rebound pull from the reverse branch structure during catheter withdrawal, leading to guidewire tip displacement, slippage, and direct dislodgement from the side branch vessel, rendering the initial guidewire positioning operation completely ineffective. Furthermore, to accommodate the reverse branch guidewire and ensure shaping space, the dual-lumen microcatheters used in existing technologies have enlarged outer diameters at the reverse branch structure, resulting in an overall thicker catheter. This leads to high resistance and poor passage in tortuous, calcified, or severely stenotic coronary arteries, making it difficult to smoothly advance to the bifurcation lesion location and hindering surgical procedures. Existing technologies also cannot meet the requirements for extreme 180° reverse branches. Therefore, there is an urgent need for a dual-lumen microcatheter with a reasonable outer diameter and excellent vascular compliance, which can both help to shape the guidewire in the coronary artery and prevent the guidewire from twisting, shifting and dislodging during the retraction process.

[0004] Prior art document (202610023455.8) discloses a dual-lumen microcatheter with controllable guidewire angle in the coronary artery. The microcatheter body has independent first and second lumens; the proximal end of the first lumen communicates with a connector, and its distal end has a distal port formed in the vessel wall, with a through-hole on the proximal side; a guidewire restraint element is fixed to the outer wall of the microcatheter body, which, together with the vessel wall, defines a guidewire restraint channel connecting the distal port and the through-hole; the second lumen has an inlet hole located on the side wall and an outlet hole on the distal end face. The guidewire restraint element can be an elastic membrane, with both ends fixed by retaining rings; a contrast marker can be provided near the through-hole. The microcatheter disclosed in the prior art has a larger diameter than a microcatheter with only two lumens when the first lumen, second lumen, and constraint channel are present simultaneously. In addition, the guidewire is rigidly constrained by the channel in the side wall inlet and distal outlet of the second lumen during shaping. This constraint always exists when the catheter is retracted, causing the guidewire to twist in the microcatheter and its tip to be easily affected by stress. The technical solution in the prior art also cannot achieve an extreme 180° reverse support. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] This invention addresses the technical problems in existing technologies where guidewire backflow catheters used for intracoronary guidewire backflow are prone to guidewire tip displacement and slippage during retraction, excessively large local diameter of the catheter preventing passage through narrowed blood vessels, and inability to achieve large-angle backflow. It provides a dual-lumen microcatheter for intracoronary guidewire backflow, enabling 90°-180° backflow of the guidewire within the coronary artery, preventing guidewire twisting, displacement, and dislodgement during retraction, and ensuring the catheter size adapts to the blood vessel.

[0007] This invention provides a dual-lumen microcatheter with an intracoronary guidewire reverse branch, comprising: a microcatheter body and a reverse branch covering, wherein the microcatheter body includes a main branch lumen and a branch lumen, the main branch lumen and the branch lumen are fixedly connected and parallel to each other, the branch lumen is provided with a catheter outlet and a guidewire shaping cavity, the catheter outlet is located on the side of the distal end of the branch lumen, the guidewire shaping cavity is located at the distal end of the branch lumen, and the catheter outlet is located at the end of the guidewire shaping cavity; the reverse branch covering is sleeved on the microcatheter body, the reverse branch covering and the microcatheter body are detachably connected, the reverse branch covering covers the peripheral area of ​​the distal end of the microcatheter body in a cubing shape, and the reverse branch covering can slide along the axial direction of the microcatheter body after being removed; the reverse branch covering has a covering outlet, the covering outlet and the catheter outlet are coaxially arranged along the side of the branch lumen; the covering outlet is located on the inner side of the edge of the catheter outlet near the distal end of the microcatheter body, and the projection of the reverse branch covering on the plane of the catheter outlet on the side of the branch lumen intersects with the catheter outlet. By incorporating a branch lumen with a catheter outlet and a catheter shaping cavity, deformation can be achieved as the guidewire passes through the shaping cavity, thus altering the guidewire angle. By incorporating a reverse-branch membrane with a membrane outlet, when the reverse-branch membrane and the microcatheter body are connected, the projection of the reverse-branch membrane on the plane of the catheter outlet intersects with the catheter outlet. After the guidewire's direction is altered by the shaping cavity, it touches the reverse-branch membrane upon passing the catheter outlet. As it continues to advance, the reverse-branch membrane constrains the guidewire's direction, further altering its angle. By incorporating... The removable reverse branch cover allows the reverse branch cover to be removed after the guidewire enters the branch vessel, releasing its restriction along the axis of the microcatheter body. The reverse branch cover no longer constrains the guidewire. When withdrawing the catheter, the guidewire remains stationary. Due to the relative displacement between the microcatheter body and the guidewire, the guidewire exerts a force on the reverse branch cover, causing the reverse branch cover to move forward along the axis of the microcatheter body. This releases the constraint force on the guidewire at the catheter exit point, preventing the guidewire from being constantly reversed when the microcatheter body is withdrawn, and thus preventing the guidewire tip from dislodging from the branch vessel. This invention, through the intervention of guidewire shaping cavity and reverse branch covering, achieves reverse branching of the guidewire within the coronary artery without significantly increasing the microcatheter diameter. Furthermore, the reverse branch angle is larger than that of guidewires from the same-sized microcatheter that are only rigidly constrained at the outlet, improving the pass rate of guidewires for lower branches in complex obtuse-angle bifurcation lesions and reducing pressure and irritation to the vessel. Moreover, the removable reverse branch covering allows the covering to be removed after the guidewire enters the branch vessel, ensuring it does not obstruct the microcatheter's exit. This avoids repeated guidewire push-ups due to guidewire dislodgement, reduces surgical time, minimizes vascular damage, improves the safety of interventional procedures, and lowers the risk of interventional complications.

[0008] Among them, the reverse branch membrane has a contrast marker at the membrane outlet, and the branch lumen has a contrast marker at the catheter outlet.

[0009] The outlet of the conduit is a circular hole.

[0010] Among them, the reverse branch membrane can partially or completely cover the catheter outlet.

[0011] In this case, the gap between the anti-branch membrane at the catheter exit and the branch lumen is smaller than the diameter of the catheter exit.

[0012] Among them, there are no gaps between the reverse branch membrane and the microcatheter body except for the distal part of the branch lumen.

[0013] The reverse-branch membrane applies axial and / or radial stress to the microcatheter body.

[0014] The present invention discloses a double-lumen microcatheter for a coronary guidewire reversal branch, wherein the reversal branch has a main branch port on its lining, located at the distal end of the main branch lumen. By providing the main branch port, a guidewire can pass through the main branch lumen into the distal end of the main branch vessel, thereby allowing the microcatheter body to follow the guidewire into the main branch vessel.

[0015] When the reverse branch membrane and the microcatheter body are connected, the main branch hole is subjected to axial stress from the main branch lumen.

[0016] The present invention discloses a dual-lumen microcatheter for intracoronary guidewire reverse branching, comprising a guidewire, wherein the diameter of the guidewire shaping cavity is larger than the diameter of the guidewire, and the cavity has a curvature. After the end of the guidewire passes through the shaping cavity, the axis of the end of the guidewire and the axis of the branch lumen form an angle of ≥90° with the axis of the branch lumen as the starting side. After passing through the shaping cavity, the guidewire extends out of the branch lumen from the catheter outlet and contacts the reverse branch covering membrane, and then extends out of the reverse branch covering membrane from the covering membrane outlet. By setting the guidewire shaping cavity with a diameter slightly larger than the guidewire diameter, the end of the guidewire is constrained by the shaping cavity as it passes through, and thus advances along the curvature of the shaping cavity to form an angle of ≥90° with the axis of the branch lumen, completing the initial reverse branching of the guidewire. This also avoids the guidewire being inserted backward into the gap between the reverse branch covering membrane and the branch lumen, ensuring that the guidewire advances towards the covering membrane outlet as it passes through. By restricting the guidewire of the initial reverse branch with a membrane covering the reverse branch, the guidewire can be further adjusted in terms of its advancement angle along the constraint of the membrane, forming an angle greater than 90° with the branch lumen axis. This completes the secondary reverse branch outside the branch lumen. Without increasing the thickness of the guidewire shaping lumen wall, the soft but restrictive membrane restricts the guidewire's advancement direction, achieving a reasonable overall diameter for the dual-lumen microcatheter, facilitating entry into the coronary artery, avoiding compression of the vessel at the reverse branch, and providing good passage in tortuous, calcified, or severely stenotic coronary vessels. Its large reverse branch angle adapts to large-angle reverse branch lesions, improving surgical efficiency and safety, and reducing damage to the patient's blood vessels.

[0017] The diameter of the guidewire shaping cavity is slightly larger than the diameter of the guidewire.

[0018] Among them, the cavity at the outlet of the guidewire shaping cavity is a partially annular cavity, and the diameter of the cavity away from the outlet gradually decreases from the diameter of the branch cavity to slightly larger than the diameter of the guidewire, and the central axis of the cavity gradually approaches the main branch cavity.

[0019] This invention discloses a dual-lumen microcatheter with an intracoronary guidewire reversal branch. The reversal branch is completely covered by a lining covering the catheter exit. The lining exit is located on the distal side of the microcatheter body away from the catheter exit. The guidewire passes through the catheter exit to the lining exit. After the tip of the guidewire passes through the lining exit, the axis of the tip and the axis of the branch lumen form a 180° angle with the axis of the branch lumen as the starting side. By completely covering the catheter exit with the reversal branch lining, the guidewire, after initial reversal in the catheter shaping lumen, can only advance along the gap between the reversal branch lining and the reversal branch lumen until its tip exceeds the catheter exit. It then advances along the wall of the branch lumen, thus forming a 180° angle with the branch lumen axis and entering the branch vessel of the extreme reversal branch. This improves the dual-lumen microcatheter's ability to handle complex lesions.

[0020] The present invention discloses a dual-lumen microcatheter with a guidewire reverse branch in the coronary artery, comprising a covering connection portion connected to the proximal end of the microcatheter body. The reverse branch covering and the covering connection portion are detachably connected. After the reverse branch covering is detached, it can slide relative to the microcatheter body along the axial direction of the microcatheter body. After the guidewire passes through the covering outlet, the connection between the reverse branch covering and the covering connection portion is released. While keeping the guidewire stationary, the microcatheter body is retracted, and the reverse branch covering undergoes relative displacement with the microcatheter body under the push of the guidewire through the covering outlet. By setting a diaphragm connector, the diaphragm of the reverse branch can be disconnected from the microcatheter body at the proximal end. When the guidewire is withdrawn, the diaphragm of the reverse branch is released from its covering of the distal end of the branch lumen by the force of the guidewire, no longer restricting the guidewire. This reduces the shaping force on the rest of the guidewire and reduces the excessive rebound force on the guidewire tip caused by catheter withdrawal, thereby reducing the risk of the guidewire tip dislodging from the branch vessel. At the same time, placing the diaphragm connector at the proximal end conforms to the operating procedures during surgery, allowing the operator to release the restriction on the guidewire outside the patient's body, thus improving the practicality of the dual-lumen microcatheter.

[0021] This invention discloses a dual-lumen microcatheter for coronary guidewire reversal, comprising a limiting structure and a covering body. The limiting structure has a fixed end, and the covering body has a connecting end. The limiting structure and the covering body are fixedly connected via the fixed end and the connecting end, respectively. The covering body and the covering body are detachably connected via the connecting end. When the covering body is detached from the covering body, the covering body can slide relative to the microcatheter body along the axial direction of the microcatheter body under the constraint of the limiting structure. By setting the limiting structure, the reversal covering is limited, restricting the displacement of the reversal covering in the axial direction of the microcatheter body during catheter withdrawal, preventing the reversal covering from accumulating or remaining in the blood vessel during withdrawal, thus improving the safety of the dual-lumen microcatheter.

[0022] The present invention discloses a dual-lumen microcatheter for coronary guidewire reversal, wherein the overlay connector is adjustablely fitted onto the microcatheter body. By providing an adjustable overlay connector, the axial stress of the reversal overlay on the branch lumen can be adjusted according to different reversal requirements found during the operation. This allows for changes in the constraint force or constraint distance of the reversal overlay on the guidewire outside the branch lumen, or even the release of constraint, thereby enabling flexible adjustment of the guidewire reversal angle during the operation and improving the dual-lumen microcatheter's ability to handle complex situations.

[0023] The membrane-covered connection can be adjusted towards the distal end of the microcatheter.

[0024] Among them, the anti-branch membrane has elasticity in the axial direction of the microcatheter body.

[0025] The present invention discloses a dual-lumen microcatheter with a coronary guidewire reverse branch. The reverse branch cover also includes a retraction outlet, which is connected to form a complete cavity. The area of ​​the retraction outlet is greater than or equal to the area of ​​the catheter outlet. When the reverse branch cover is detached from the microcatheter body, the reverse branch cover slides relative to the microcatheter body along the microcatheter body axis, and the retraction outlet completely exposes the catheter outlet outside the reverse branch cover. By providing a retraction outlet, the catheter outlet can be better exposed during catheter retraction, relieving the stress exerted on the guidewire by the reverse branch cover and reducing the rebound force on the guidewire tip during retraction.

[0026] The double-lumen microcatheter for coronary guidewire reversal described in this invention has an elastic membrane covering the reversal branch. By setting the reversal branch covering to an elastic membrane, a radial force can be applied to the guidewire at the catheter exit point to assist the guidewire in completing the secondary reversal. At the same time, it avoids the continuous restriction of the guidewire by rigid shaping during catheter withdrawal, increases the angle of the guidewire reversal, prevents the guidewire tip from dislodging from the branch vessel, and increases the practicality of the double-lumen microcatheter.

[0027] The present invention discloses a double-lumen microcatheter for a coronary guidewire counterflow branch, wherein the counterflow drape and the microcatheter body are seamless except at the distal end of the branch lumen. By ensuring that the counterflow drape and the microcatheter body are seamless except at the catheter exit point, it is possible to avoid the counterflow drape from partially accumulating due to vascular adhesion forces and the drape exit point shifting relative to the catheter exit point when the microcatheter body penetrates deeper into the blood vessel.

[0028] The present invention has the following beneficial effects: (1) This invention utilizes the dual reshaping effect of the guidewire shaping cavity at the distal end of the branch lumen and the covering-like anti-branch membrane. First, the guidewire is initially bent through the curved guidewire shaping cavity, achieving the initial anti-branch with the guidewire and the branch lumen axis at an angle greater than or equal to 90°. Then, the secondary angle is adjusted by the membrane constraint. The secondary anti-branch of the guidewire can be achieved at 90°-180° without increasing the catheter diameter. It is suitable for complex lesion scenarios with obtuse bifurcation of the coronary artery and large angle of the side branch. It solves the problem that existing double-lumen microcatheters cannot achieve large-angle anti-branch and greatly improves the success rate of guidewire placement in side branch vessels. (2) The present invention adopts a detachable anti-branch cover design. After the guidewire is accurately inserted into the true lumen of the side branch vessel, the connection between the cover and the microcatheter body can be quickly released. When the microcatheter body is withdrawn, the guidewire remains in place. The cover will slide along the catheter axis under the push of the guidewire, thereby releasing the plastic constraint force on the guidewire and eliminating the rebound pull force generated when the traditional rigid constraint microcatheter is withdrawn. This avoids the problem of the guidewire end being pulled and displaced by stress and dislodged from the side branch vessel. There is no need to repeatedly adjust the guidewire position, ensuring the continuity and stability of the interventional operation. (3) This invention abandons the traditional design of using thickened tube walls to add rigid counterbranch structures in microcatheters. Instead, it uses an ultra-thin elastic counterbranch membrane to replace rigid shaping components. This does not significantly increase the overall outer diameter of the microcatheter. The catheter diameter is reasonably designed, which avoids scratching the inner wall of the tortuous, calcified or stenotic segments of the coronary artery due to excessive local diameter. It can also effectively reduce the resistance to pushing the catheter through the vessel, allowing it to pass smoothly through lesions with severe stenosis and tortuous vessels. It is convenient to enter the distal bifurcation of the coronary artery, adapt to various complex coronary vascular anatomy structures, and reduce the risk of vascular injury during the operation. (4) Through the synergistic design of the adjustable cover connection and the elastic reverse branch cover, the surgeon can adjust the axial position of the cover connection according to the actual lesion during the operation, change the constraint force and constraint distance of the reverse branch cover on the guidewire, and thus flexibly fine-tune the angle of the guidewire reverse branch. At the same time, with the structural design of the cover outlet and the retraction outlet, the guidewire exit angle can be adjusted as needed, and it can be adapted to side branch vessels at different angles without changing the instrument, thereby improving the versatility of the instrument and the flexibility of the surgical operation.

[0029] These and other advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0030] To further illustrate the above and other advantages and features of this application, the specific embodiments of this application will be described in more detail below with reference to the accompanying drawings. The drawings, together with the following detailed description, are included in and form a part of this specification. Elements having the same function and structure are indicated by the same reference numerals. It should be understood that these drawings only depict typical examples of this application and should not be considered as limiting the scope of this application.

[0031] Figure 1 This is a schematic diagram of the structure of a double-lumen microcatheter with a guidewire counterflow branch in the coronary artery according to this application; Figure 2 This is a schematic diagram of the main lumen and branch lumen of a dual-lumen microcatheter with a coronary guidewire counterflow according to this application; Figure 3 This is a schematic diagram of the covered outlet and catheter outlet of a dual-lumen microcatheter with a coronary guidewire backflow according to this application; Figure 4 This is a schematic diagram of a dual-lumen microcatheter with a coronary guidewire counterflow according to this application; Figure 5 This is a schematic diagram of the retraction catheter state of a double-lumen microcatheter with a coronary guidewire counterflow branch according to this application. Figure 6 This is a schematic diagram of the covered connection portion of a double-lumen microcatheter with a coronary guidewire back branch according to this application.

[0032] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0033] Explanation of reference numerals in the attached figures: 1. Reverse support membrane; 11. Membrane outlet; 12. Main support hole; 13. Retraction outlet; 14. Limiting structure; 15. Membrane body; 2. Branch lumen; 21. Catheter outlet; 22. Guidewire shaping lumen; 3. Main branch lumen; 4. Microcatheter body; 5. Guidewire; 6. Covered connection. Detailed Implementation

[0034] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0035] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0036] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning as understood by a person with ordinary skills in the field to which this application pertains.

[0037] In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Example 1

[0038] like Figure 1-3 As shown, a dual-lumen microcatheter with an intracoronary guidewire reverse branch includes: a microcatheter body 4 and a reverse branch covering 1. The microcatheter body 4 includes a main branch lumen 3 and a branch lumen 2, which are fixedly connected and parallel to each other. The branch lumen 2 has a catheter outlet 21 and a guidewire shaping lumen 22. The catheter outlet 21 is located on the side of the distal end of the branch lumen 2, and the guidewire shaping lumen 22 is located at the distal end of the branch lumen 2. The catheter outlet 21 is located at the end of the guidewire shaping lumen 22. The reverse branch covering 1 is sleeved on the microcatheter body 4. The branch membrane 1 and the microcatheter body 4 are detachably connected. The reverse branch membrane 1 covers the peripheral area of ​​the distal end of the microcatheter body 4 in a hood-like shape. After the reverse branch membrane 1 is detached, it can slide along the axial direction of the microcatheter body 4. A membrane outlet 11 is provided on the reverse branch membrane 1. The membrane outlet 11 and the catheter outlet 21 are arranged coaxially along the side of the branch lumen 2. The membrane outlet 11 is located on the inner side of the edge of the catheter outlet 21 near the distal end of the microcatheter body 4. The projection of the reverse branch membrane 1 on the plane where the catheter outlet 21 is located on the side of the branch lumen 2 intersects with the catheter outlet 21.

[0039] Among them, the reverse branch membrane 1 has a contrast marker at the membrane outlet 11, and the branch lumen 2 has a contrast marker at the catheter outlet 21.

[0040] The outlet of the conduit 21 is a circular hole.

[0041] Among them, the anti-branch membrane 1 can partially or completely cover the catheter outlet 21.

[0042] In this case, the gap between the antibranch membrane 1 at the catheter outlet 21 and the branch lumen 2 is smaller than the diameter of the catheter outlet 21.

[0043] Among them, the antibranch cover membrane 1 and the microcatheter body 4 have no gaps except for the distal part of the branch lumen 2.

[0044] Among them, the reverse-branch membrane 1 applies axial stress and / or radial stress to the microcatheter body 4.

[0045] The reverse branch membrane 1 is provided with a main branch hole 12, which is located at the end of the cavity of the main branch lumen 3.

[0046] The reverse-braced film 1 is an elastic film.

[0047] There is no gap between the reverse branch membrane 1 and the microcatheter body 4 except at the distal end of the branch lumen 2.

[0048] like Figure 4 As shown, it also includes a guidewire 5. The diameter of the guidewire shaping cavity 22 is larger than the diameter of the guidewire 5. The cavity of the guidewire shaping cavity 22 has curvature. After the end of the guidewire 5 passes through the guidewire shaping cavity 22, the axis of the end and the axis of the branch lumen 2 form an angle of greater than or equal to 90° with the axis of the branch lumen 2 as the starting side. After the guidewire 5 passes through the guidewire shaping cavity 22, it extends out of the branch lumen 2 from the catheter outlet 21 and contacts the reverse branch membrane 1. Then it extends out of the reverse branch membrane 1 through the membrane outlet 11.

[0049] The diameter of the guidewire shaping cavity 22 is slightly larger than the diameter of the guidewire 5.

[0050] Among them, the cavity at the outlet of the guidewire shaping cavity 22 is a partially annular cavity. The diameter of the cavity away from the outlet gradually decreases from the diameter of the branch cavity 2 to slightly larger than the diameter of the guidewire 5, and the central axis of the cavity gradually approaches the main branch cavity 3.

[0051] The reverse branch liner 1 completely covers the catheter outlet 21. The liner outlet 11 is located on the side of the catheter outlet 21 away from the distal end of the microcatheter body 4. The guidewire 5 passes through the catheter outlet 21 to the liner outlet 11. After the end of the guidewire 5 passes through the liner outlet 11, the axis of the end and the axis of the branch lumen 2 form an angle of 180° with the axis of the branch lumen 2 as the starting side.

[0052] like Figures 5-6As shown, it includes a membrane connection part 6, which is connected to the proximal end of the microcatheter body 4. The reverse branch membrane 1 and the membrane connection part 6 are detachably connected. After the reverse branch membrane 1 is detached, it can slide relative to the microcatheter body 4 along the axial direction of the microcatheter body 4. After the guidewire 5 passes through the membrane outlet 11, the connection between the reverse branch membrane 1 and the membrane connection part 6 is released. The guidewire 5 is kept stationary, and the microcatheter body 4 is retracted. The reverse branch membrane 1 is pushed by the guidewire 5 through the membrane outlet 11 and undergoes relative displacement with the microcatheter body 4.

[0053] The reverse-branch coating 1 includes a limiting structure 14 and a coating body 15. The limiting structure 14 is provided with a fixed end, and the coating body 15 is provided with a connecting end. The limiting structure 14 and the coating connecting part 6 are fixedly connected through the fixed end, and the limiting structure 14 and the coating body 15 are fixedly connected through the connecting end. The coating body 15 and the coating connecting part 6 are detachably connected through the connecting end. When the coating body 15 is detached from the coating connecting part 6, the coating body 15 can slide relative to the microcatheter body 4 along the axial direction of the microcatheter body 4 under the restriction of the limiting structure 14.

[0054] The membrane connection part 6 is adjustablely fitted onto the microcatheter body 4.

[0055] The membrane connection part 6 can be adjusted to the distal end of the microcatheter.

[0056] Among them, the anti-branch membrane 1 is elastic in the axial direction of the microcatheter body 4.

[0057] The reverse branch membrane 1 is also provided with a retraction outlet 13. The membrane outlet 11 and the retraction outlet 13 are connected to form a complete hole. The area of ​​the retraction outlet 13 is greater than or equal to the area of ​​the catheter outlet 21. When the reverse branch membrane 1 is disassembled from the microcatheter body 4, the reverse branch membrane 1 slides relative to the microcatheter body 4 along the axial direction of the microcatheter body 4. The retraction outlet 13 can completely expose the catheter outlet 21 outside the reverse branch membrane 1.

[0058] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A double-lumen microcatheter with a guidewire reversal branch in the coronary artery, characterized in that, include: The microcatheter body (4), guidewire (5), overlay connection (6), and reverse branch overlay (1) are included. The microcatheter body (4) includes a main branch lumen (3) and a branch lumen (2). The main branch lumen (3) and the branch lumen (2) are fixedly connected and parallel to each other. The branch lumen (2) is provided with a catheter outlet (21) and a guidewire shaping cavity (22). The catheter outlet (21) is located on the side of the distal end of the branch lumen (2). The guidewire shaping cavity (22) is located at the distal end of the branch lumen (2). The catheter outlet (21) is located at the end of the guidewire shaping cavity (22). The reverse branch membrane (1) is sleeved on the microcatheter body (4). The reverse branch membrane (1) and the microcatheter body (4) are detachably connected. The reverse branch membrane (1) covers the peripheral area of ​​the distal end of the microcatheter body (4) in a hood-like shape. After the reverse branch membrane (1) is removed, it can slide along the axial direction of the microcatheter body (4). The reverse branch membrane (1) is provided with a membrane outlet (11), and the membrane outlet (11) and the catheter outlet (21) are arranged coaxially along the side of the branch lumen (2); the membrane outlet (11) is located on the inner side of the catheter outlet (21) near the distal end of the microcatheter body (4), and the projection of the reverse branch membrane (1) on the side of the branch lumen (2) on the plane where the catheter outlet (21) is located intersects with the catheter outlet (21); The diameter of the guide wire shaping cavity (22) is greater than the diameter of the guide wire (5). The cavity of the guide wire shaping cavity (22) has curvature. After the end of the guide wire (5) passes through the guide wire shaping cavity (22), the axis of the end and the axis of the branch tube cavity (2) form an angle greater than or equal to 90° with the axis of the branch tube cavity (2) as the starting side. After the guidewire (5) passes through the guidewire shaping cavity (22), it extends out of the branch lumen (2) from the catheter outlet (21) and contacts the reverse branch membrane (1), and then extends out of the reverse branch membrane (1) through the membrane outlet (11). The membrane connection part (6) is connected to the proximal end of the microcatheter body (4). The reverse branch membrane (1) and the membrane connection part (6) are detachably connected. After the reverse branch membrane (1) is detached, it can slide relative to the microcatheter body (4) along the axial direction of the microcatheter body (4). After the guidewire (5) passes through the membrane outlet (11), the connection between the reverse branch membrane (1) and the membrane connection part (6) is released. The guidewire (5) remains stationary, and the microcatheter body (4) is retracted. The reverse branch membrane (1) is pushed by the guidewire (5) through the membrane outlet (11) and the microcatheter body (4) undergoes relative displacement.

2. The double-lumen microcatheter with a reversed branch of the coronary guidewire according to claim 1, characterized in that, The reverse branch membrane (1) is provided with a main branch hole (12), which is located at the end of the cavity of the main branch tube (3).

3. The double-lumen microcatheter with a reversed branch of the guidewire in the coronary artery according to claim 1, characterized in that, The reverse branch membrane (1) completely covers the catheter outlet (21). The membrane outlet (11) is located on the side of the catheter outlet (21) away from the distal end of the microcatheter body (4). The guidewire (5) passes through the catheter outlet (21) to the membrane outlet (11). After the end of the guidewire (5) passes through the membrane outlet (11), the axis of the end and the axis of the branch lumen (2) form an angle of 180° with the axis of the branch lumen (2) as the starting side.

4. The double-lumen microcatheter with a reversed branch of the coronary guidewire according to claim 1, characterized in that, The reverse-branch membrane (1) includes a limiting structure (14) and a membrane body (15). The limiting structure (14) is provided with a fixed end, and the membrane body (15) is provided with a connecting end. The limiting structure (14) and the membrane connecting part (6) are fixedly connected through the fixed end. The limiting structure (14) and the membrane body (15) are fixedly connected through the connecting end. The membrane body (15) and the membrane connecting part (6) are detachably connected through the connecting end. When the membrane body (15) is detached from the membrane connecting part (6), the membrane body (15) can slide relative to the microcatheter body (4) along the axial direction of the microcatheter body (4) under the restriction of the limiting structure (14).

5. The double-lumen microcatheter with a reversed branch of the guidewire in the coronary artery according to claim 1, characterized in that, The membrane connection part (6) is adjustablely fitted onto the microcatheter body (4).

6. The double-lumen microcatheter with a reversed branch of the coronary guidewire according to claim 1, characterized in that, The reverse support film (1) is also provided with a retraction outlet (13), and the film outlet (11) and the retraction outlet (13) are connected to form a hole; The area of ​​the retraction outlet (13) is greater than or equal to the area of ​​the catheter outlet (21). When the back branch membrane (1) is disassembled from the microcatheter body (4), the back branch membrane (1) slides relative to the microcatheter body (4) along the axial direction of the microcatheter body (4), and the retraction outlet (13) can completely expose the catheter outlet (21) outside the back branch membrane (1).

7. A double-lumen microcatheter with a coronary guidewire counterflow branch according to any one of claims 1-6, characterized in that, The reverse-braced film (1) is an elastic film.

8. A double-lumen microcatheter with a coronary guidewire reversal branch according to any one of claims 1-6, characterized in that, There is no gap between the reverse branch membrane (1) and the microcatheter body (4) except at the distal end of the branch lumen (2).

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