Interventional catheter assembly

Abstract

The invention provides an interventional catheter assembly, and belongs to the technical field of medical instruments. The catheter assembly comprises a conveying catheter body, and the conveying catheter body is provided with a first conveying catheter cavity arranged in the axial direction and used for conveying a treatment instrument to a treatment part; a second conveying pipe cavity parallel to the first conveying pipe cavity is further formed in the conveying pipe body, a penetrating hole communicated with the outside is formed in the second conveying pipe cavity, and a supporting micro-catheter is arranged in the second conveying pipe cavity in a sliding mode and used for penetrating into a collateral vessel of the common carotid artery from the conveying pipe body through the penetrating hole. The supporting micro catheter is provided with a positioning component which is used for preventing the conveying catheter body from displacing at the intersection of the common carotid artery and the aortic arch when the treatment instrument is conveyed, so that the position stability of the conveying catheter body is guaranteed when the treatment instrument is conveyed to a treatment part through the first conveying catheter cavity; the catheter is mainly used for solving the technical problem that an instrument is inconvenient to convey due to insufficient supporting performance of an existing catheter.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to an interventional catheter assembly. Background Technology

[0002] Interventional vascular therapy is a minimally invasive technique that uses instruments such as puncture needles, catheters, and guidewires to diagnose and treat diseases through blood vessels, guided by medical imaging equipment (such as X-ray, ultrasound, CT, MRI, etc.). Diagnostic drugs or therapeutic instruments are delivered to the lesion site via a catheter inserted into a blood vessel for targeted diagnosis and treatment. This avoids the large incisions and extensive damage to the body associated with traditional surgery. Due to its advantages such as minimal trauma, rapid recovery, fewer complications, and shorter hospital stays, it can significantly improve patients' quality of life. For patients who cannot tolerate traditional surgery or whose traditional surgery carries high risks, interventional vascular therapy is often an effective alternative.

[0003] like Figure 1 As shown, when treating cerebrovascular diseases through vascular interventional surgery, catheter 1 needs to enter the common carotid artery 3 after entering the aortic arch 2, and then be pushed upward along the common carotid artery 3 to the site to be treated. At this time, catheter 1 needs to have very good flexibility and bend tracking ability at the aortic arch 2 position to better meet the passage requirements at this position. For this reason, catheter 1 needs to be designed to be very flexible. However, the flexible tube body will bring the problem of insufficient support at the aortic arch 2. When the treatment device (such as balloon, stent and other treatment devices with poor flexibility) is delivered to the treatment site through the inside of catheter 1, it will generate a downward reaction force on the inner wall of the catheter 1 lumen, causing the part of catheter 1 that enters the common carotid artery 3 to fall back to the aortic arch 2.

[0004] Traditional methods typically require the operator to repeatedly push the device at the aortic arch to allow it to pass smoothly. This requires a high level of experience and skill from the operator, is cumbersome, inefficient, and prone to complications.

[0005] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0006] The purpose of this invention is to provide an interventional catheter assembly to solve the technical problem that insufficient support of existing catheters leads to inconvenient delivery of instruments.

[0007] To achieve the above objectives, the interventional catheter assembly of the present invention provides the following technical solution:

[0008] An interventional catheter assembly includes a delivery catheter body having a first delivery lumen arranged axially for delivering a therapeutic device to a treatment site; the delivery catheter body also has a second delivery lumen arranged parallel to the first delivery lumen, the second delivery lumen having a perforation communicating with the outside; a supporting microcatheter is slidably arranged within the second delivery lumen, the supporting microcatheter being used to pass through the perforation into a parabranch of the common carotid artery from the delivery catheter body; the supporting microcatheter has a positioning component for preventing displacement of the delivery catheter body at the junction of the common carotid artery and the aortic arch during delivery of the therapeutic device, so as to ensure the positional stability of the delivery catheter body when delivering the therapeutic device to the treatment site through the first delivery lumen.

[0009] As a further optimized technical solution, the positioning component includes multiple balloons, which are arranged at intervals along the axial direction of the supporting microcatheter. The balloons near the distal end of the supporting microcatheter are radially expanded and used to be locked in the para-branch blood vessel, while the balloons near the proximal end of the supporting microcatheter are radially expanded and used to be locked in the second delivery lumen.

[0010] As a further optimized technical solution, the distal end of the supporting microcatheter is closed, and the lumen of the supporting microcatheter is used to deliver the medium for inflating the balloon.

[0011] As a further optimized technical solution, the supporting microcatheter is arranged in segments at the balloon position, and the two ends of any one of the balloons are respectively fixedly connected to the two adjacent supporting microcatheter segments, so that the inner lumen of the balloon is directly connected to the lumen of the supporting microcatheter.

[0012] As a further optimized technical solution, the balloon has two parts: the balloon near the distal end of the supporting microcatheter expands radially and is used to be locked in the para-branch blood vessel, and the balloon near the proximal end of the supporting microcatheter expands radially and is used to be locked in the second delivery lumen.

[0013] As a further optimized technical solution, an isolation element is arranged inside the delivery conduit body, which isolates the lumen of the delivery conduit body to form the first delivery lumen and the second delivery lumen.

[0014] As a further optimized technical solution, a guide component for guiding and supporting the microcatheter into the paravascular branch is arranged in the second delivery lumen near the distal end of the perforation.

[0015] As a further optimized technical solution, the guide component is an arc-shaped plate, one end of which is fixedly connected to the isolation component, and the other end is fixedly connected to the inner wall of the second conveying cavity.

[0016] As a further optimized technical solution, the guide component is a straight plate. One end of the straight plate is fixedly connected to the isolation member, and the other end is fixedly connected to the inner wall of the second conveying cavity. The straight plate is arranged to gradually tilt away from the isolation member from the near end to the far end.

[0017] As a further optimized technical solution, the distal end of the second delivery cavity is terminated at the position of the guide component.

[0018] Beneficial effects: The interventional catheter assembly of the present invention, by setting a second delivery lumen and a supporting microcatheter, allows the supporting microcatheter to enter the para-branch vessels of the common carotid artery through a perforation when a therapeutic device needs to be delivered. The positioning component stably fixes the delivery catheter body at the junction of the common carotid artery and the aortic arch, preventing displacement of the delivery catheter body when delivering the therapeutic device. This effectively solves the problem of insufficient support of existing catheters at the aortic arch, reduces the difficulty of operation, improves the efficiency of device delivery, and reduces the possibility of complications.

[0019] Furthermore, the positioning component employs a multi-balloon design. By placing balloons at different positions within the para-branch vessels and the second delivery lumen, reliable positioning can be provided, ensuring the convenience and reliability of the positioning operation. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0021] Figure 1 This is a schematic diagram of vascular interventional surgery in the existing technology;

[0022] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the interventional catheter assembly of the present invention;

[0023] Figure 3 For the interventional catheter assembly of the present invention in Figure 2 A cross-sectional view along the AA direction;

[0024] Figure 4 This is a schematic diagram of the working state of Embodiment 1 of the interventional catheter assembly of the present invention;

[0025] Figure 5 for Figure 4 Enlarged schematic diagram of part B;

[0026] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the interventional catheter assembly of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of embodiment 3 of the interventional catheter assembly of the present invention.

[0028] In the diagram: 1. Catheter; 2. Aortic arch; 3. Common carotid artery; 4. Paraplegic vessel; 100. Delivery catheter body; 110. First delivery lumen; 120. Second delivery lumen; 121. Perforation; 122. Guide component; 130. Isolation component; 200. Supporting microcatheter; 210. Balloon. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0032] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0033] This invention provides an interventional catheter assembly designed to address the technical problems of insufficient support and difficult device delivery in existing catheters during vascular interventional therapy. Its core structure is a delivery catheter body 100, internally comprising a first delivery lumen 110 and a second delivery lumen 120 that are parallel to each other. The first delivery lumen 110 is used to deliver therapeutic instruments, while the second delivery lumen 120 allows a supporting microcatheter 200 to enter a parabranch vessel 4 of the common carotid artery 3 through a perforation 121. Multiple spaced balloons 210 on the supporting microcatheter 200 constitute a positioning component. By engaging the distal balloon 210 in the parabranch vessel 4 and the proximal balloon 210 in the second delivery lumen 120, displacement of the delivery catheter body 100 at the junction of the common carotid artery 3 and the aortic arch 2 is prevented. This invention effectively improves the support of the delivery catheter body 100, reduces operational difficulty, increases device delivery efficiency, and reduces complications, demonstrating promising application prospects.

[0034] Example 1

[0035] like Figure 2 , Figure 3 As shown, the interventional catheter assembly includes a delivery catheter body 100, the internal lumen of which is divided by a separator 130 into a first delivery lumen 110 arranged axially and a second delivery lumen 120 parallel to the first delivery lumen 110. The first delivery lumen 110 is used to carry and deliver a therapeutic device to the treatment site. The second delivery lumen 120 is provided with a perforation 121 communicating with the outside, and a supporting microcatheter 200 is slidably disposed inside. The supporting microcatheter 200 is provided with a positioning component. The supporting microcatheter 200 is used to pass through the perforation 121 from the delivery catheter body 100 into the parabranch vessel 4 of the common carotid artery 3. The positioning component is used to prevent the delivery catheter body 100 from shifting at the junction of the common carotid artery 3 and the aortic arch 2 when delivering the therapeutic device, so as to ensure the positional stability of the delivery catheter body 100 when delivering the therapeutic device to the treatment site through the first delivery lumen 110.

[0036] Because the radial dimension of the therapeutic instrument is larger than that of the supporting microcatheter 200, the diameter of the first delivery lumen 110 is 5-8 times the diameter of the second delivery lumen 120 to facilitate instrument delivery. Furthermore, the rigidity of the supporting microcatheter 200 is much lower than that of any other therapeutic instrument. Therefore, during surgical procedures, when the supporting microcatheter 200 travels distally along the second delivery lumen 120, the downward reaction force exerted on the inner wall of the delivery catheter body 100 is minimal and insufficient to cause downward movement of the delivery catheter body 100. Based on this, the position of the delivery catheter body 100 is fixed by manipulating the positioning components on the supporting microcatheter 200.

[0037] In this embodiment, the positioning component includes two balloons 210. The balloons 210 are arranged axially at intervals along the supporting microcatheter 200. The balloon 210 near the distal end of the supporting microcatheter 200 is radially expanded and used to be locked in the parabranch vessel 4. The balloon 210 near the proximal end of the supporting microcatheter 200 is radially expanded and used to be locked in the second delivery lumen 120.

[0038] To facilitate rapid repositioning of the balloon 210, the distal end of the supporting microcatheter 200 is closed, and the lumen of the supporting microcatheter 200 is used to deliver the medium that inflates the balloon 210 (the medium can be physiological saline, contrast agent or gas).

[0039] Furthermore, the supporting microcatheter 200 is segmented at the balloon 210 position, with each end of any balloon 210 fixedly connected to two adjacent segments of the supporting microcatheter 200, so that the inner lumen of the balloon 210 is directly connected to the lumen of the supporting microcatheter 200. This direct connection allows the filling medium within the lumen of the supporting microcatheter 200 to enter the inner lumen of the balloon 210 without obstruction. Compared to the common channel-type inflatable balloon 210 (where the existing balloon is wrapped around a continuous catheter with a through-hole allowing the filling medium to enter and exit the balloon), the segmented indirect connection method reduces resistance in the filling medium's transmission path, ensuring that the balloon 210 reaches the required inflation level quickly, thus rapidly positioning and fixing the delivery catheter body 100. For example, in emergency vascular interventional procedures, the rapidly inflating balloon 210 can promptly stabilize the position of the delivery catheter body 100, buying time for subsequent treatment. Even in non-emergency vascular interventional procedures, the impact on the collateral vessels 4 can be reduced. In addition, this design can further reduce the overall rigidity of the supporting microcatheter 200 and increase its flexibility.

[0040] To ensure the smooth entry of the supporting microcatheter 200 into the parabranch 4 of the common carotid artery 3, a guide component 122 is positioned within the second delivery lumen 120, near the distal end of the perforation 121, to guide the supporting microcatheter 200 into the parabranch 4. Given the limited operating space and complex vascular structure in interventional vascular surgery, the guide component 122 provides clear guidance for the movement of the supporting microcatheter 200. In actual operation, when the surgeon pushes the supporting microcatheter 200, the guide component 122 guides it along a pre-set path through the perforation 121 into the parabranch 4, effectively improving operational accuracy, reducing surgical risks, and enhancing surgical safety.

[0041] In this embodiment, the guide component 122 is an arc-shaped plate, with one end fixedly connected to the isolation member 130 and the other end fixedly connected to the inner wall of the second delivery lumen 120. This design is intended to reduce friction and collision between the supporting microcatheter 200 and the vessel wall during its movement due to the smooth transition of the arc-shaped plate's surface. When the supporting microcatheter 200 slides along the guide of the arc-shaped plate, its movement trajectory is gentler, reducing resistance caused by sudden angle changes during the distal turning of the supporting microcatheter 200, thus improving the success rate and smoothness of entry into the parabranch vessel 4. Furthermore, different patients have individual differences in vascular anatomy, and the position, angle, and degree of curvature of the parabranch vessel 4 vary. The arc-shaped plate can be produced in various models according to actual needs, and by adjusting parameters such as curvature and length, it can better adapt to various complex vascular morphologies. Whether the vessel is relatively straight or has a large degree of curvature, the arc-shaped plate can provide suitable guidance, enhancing the versatility and applicability of the interventional catheter assembly and expanding its clinical application range.

[0042] Furthermore, the distal end of the second delivery lumen 120 terminates at the guide member 122. This design aims to increase the lumen diameter at the distal end of the delivery catheter body 100, facilitating surgical manipulation of the treatment instruments at the distal end of the delivery catheter body 100. Additionally, shortening the length of the second delivery lumen 120 reduces the complexity of the manufacturing process and the amount of materials used. Eliminating the need for special treatment of excessively long lumen sections reduces production difficulty and cost, while also simplifying the internal structure of the entire interventional catheter assembly, making the product easier to manufacture and assemble, and improving production efficiency.

[0043] In this embodiment, the isolator 130 is integrally fixedly connected to the guide component 122 of the arc-shaped plate. That is, after the isolator 130 is arranged axially along the delivery catheter body 100, it bends directly towards the perforation 121 at its distal end. This ensures that when the supporting microcatheter 200 exits the second delivery lumen 120 and enters the bypass vessel 4, it completely follows the guiding path defined by the isolator 130 and the guide component 122. This design reduces unnecessary lumen extension, makes the travel path of the supporting microcatheter 200 more defined and controllable, and improves the accuracy of entering the bypass vessel 4.

[0044] like Figure 4 , Figure 5As shown, in actual operation, the distal end of the delivery catheter body 100 is first gradually pushed along the vascular path to the target treatment site. Next, the supporting microcatheter 200 is pushed to slide within the second delivery lumen 120. Guided by the guide component 122, the supporting microcatheter 200 passes through the perforation 121 out of the delivery catheter body 100 and enters the parabranch vascular 4 of the common carotid artery 3. Subsequently, an inflation medium is delivered to the balloon 210 through the lumen of the supporting microcatheter 200, causing the balloon 210 near the distal end of the supporting microcatheter 200 to expand radially within the parabranch vascular 4 and become tightly secured there. The balloon 210 near the proximal end of the supporting microcatheter 200 expands radially within the second delivery lumen 120 and becomes securely secured there, thus ensuring the stability of the delivery catheter body 100's position. At this point, the treatment device can be safely and stably delivered to the treatment site through the first delivery lumen 110. Throughout the process, the positioning component can effectively resist the reaction force generated by the delivery of the treatment device, preventing displacement of the delivery catheter body 100 at the junction of the common carotid artery 3 and the aortic arch 2. After the treatment device is delivered, the medium in the supporting microcatheter 200 is withdrawn, causing the balloon 210 to contract, and then the supporting microcatheter 200 is withdrawn.

[0045] Example 2

[0046] like Figure 6 As shown, this embodiment provides a guide component 122 structure that differs from that of Embodiment 1. In this embodiment, the guide component 122 is a straight plate, one end of which is fixedly connected to the isolator 130, and the other end is connected to the inner wall of the second delivery lumen 120. The straight plate gradually tilts away from the isolator 130 from the proximal end to the distal end. During use, this straight and tilted guide component 122 can also provide good guidance for the supporting microcatheter 200, allowing the supporting microcatheter 200 to smoothly enter the paravascular vessel 4, thereby achieving stable positioning of the interventional catheter assembly on the delivery catheter body 100 and effective delivery of the therapeutic device. The remaining structure and operating procedures are the same as in Embodiment 1.

[0047] Example 3

[0048] like Figure 7As shown, this embodiment provides a different number of balloons 210 than in Embodiment 1. In this embodiment, the positioning component includes three balloons 210, which are evenly spaced along the axial direction of the supporting microcatheter 200. In practical use, the two distal balloons 210 can be inserted into the parabranch vessel 4, or the most distal balloon 210 can be inserted into the parabranch vessel 4, depending on the actual operating conditions. The increased number of balloons 210 provided in this embodiment can provide a larger contact area and stronger fixation force, further enhancing the positioning effect of the delivery catheter body 100 when delivering therapeutic devices, and improving its stability at the junction of the common carotid artery 3 and the aortic arch 2. Other structures in this embodiment, such as the delivery catheter body 100, the first delivery cavity 110, the second delivery cavity 120, the isolation member 130, and the guide member 122 (which adopts the same arc-shaped plate structure as in Embodiment 1), are the same as in Embodiment 1. The operation process is also similar to that in Embodiment 1. However, when inflating the balloon 210, it is necessary to ensure that the three balloons 210 can expand evenly and fully in order to achieve the best positioning effect.

[0049] In other embodiments, the positioning component may also be three or more balloons 210, which are arranged at intervals along the axial direction of the supporting microcatheter 200. The balloons 210 near the distal end of the supporting microcatheter 200 are radially expanded and used to be locked in the para-branch vessel 4, while the balloons 210 near the proximal end of the supporting microcatheter 200 are radially expanded and used to be locked in the second delivery lumen 120.

[0050] In summary, the interventional catheter assembly provided by this invention effectively solves the problem of insufficient support of existing catheters in vascular interventional therapy. It has a reasonable structural design, is easy to operate, and has good application prospects.

[0051] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the pending claims of the present invention.

Claims

1. An interventional catheter assembly, characterized in that, The device includes a delivery catheter body (100), which has a first delivery lumen (110) arranged axially for delivering a therapeutic device to a treatment site. The delivery catheter body (100) also has a second delivery lumen (120) arranged parallel to the first delivery lumen (110). The second delivery lumen (120) has a perforation (121) communicating with the outside. A supporting microcatheter (200) is slidably arranged in the second delivery lumen (120). The supporting microcatheter (200) is used to pass through the perforation (121) from the delivery catheter body (100) into a parabranch vessel (4) of the common carotid artery (3). The supporting microcatheter (200) has a positioning component for preventing the delivery catheter body (100) from shifting at the junction of the common carotid artery (3) and the aortic arch (2) when delivering the therapeutic device, so as to ensure the positional stability of the delivery catheter body (100) when delivering the therapeutic device to the treatment site through the first delivery lumen (110).

2. The interventional catheter assembly according to claim 1, characterized in that, The positioning component includes multiple balloons (210), which are spaced apart along the axial direction of the supporting microcatheter (200). The balloons (210) near the distal end of the supporting microcatheter (200) are radially expanded and used to be locked in the parabranch vessel (4), while the balloons (210) near the proximal end of the supporting microcatheter (200) are radially expanded and used to be locked in the second delivery lumen (120).

3. The interventional catheter assembly according to claim 2, characterized in that, The distal end of the supporting microcatheter (200) is closed, and the lumen of the supporting microcatheter (200) is used to deliver the medium for the inflatable balloon (210).

4. The interventional catheter assembly according to claim 3, characterized in that, The supporting microcatheter (200) is arranged in segments at the position of the balloon (210), and the two ends of any one of the balloons (210) are fixedly connected to the two adjacent supporting microcatheter segments (200) so that the inner lumen of the balloon (210) is directly connected to the lumen of the supporting microcatheter (200).

5. The interventional catheter assembly according to claim 2, characterized in that, The balloon (210) has two parts. The balloon (210) near the distal end of the supporting microcatheter (200) is radially expanded and used to be inserted into the parabranch vessel (4). The balloon (210) near the proximal end of the supporting microcatheter (200) is radially expanded and used to be inserted into the second delivery lumen (120).

6. The interventional catheter assembly according to any one of claims 1-5, characterized in that, An isolation element (130) is arranged inside the delivery conduit body (100), and the isolation element (130) isolates the lumen of the delivery conduit body (100) to form the first delivery lumen (110) and the second delivery lumen (120).

7. The interventional catheter assembly according to claim 6, characterized in that, The second delivery lumen (120) has a guide component (122) arranged at a position near the distal end of the perforation (121) for guiding the support microcatheter (200) into the parabranch vessel (4).

8. The interventional catheter assembly according to claim 7, characterized in that, The guide component (122) is an arc-shaped plate. One end of the arc-shaped plate is fixedly connected to the isolation component (130), and the other end is fixedly connected to the inner wall of the second conveying cavity (120).

9. The interventional catheter assembly according to claim 7, characterized in that, The guide component (122) is a straight plate. One end of the straight plate is fixedly connected to the isolation member (130), and the other end is fixedly connected to the inner wall of the second conveying cavity (120). The straight plate is arranged to gradually move away from the isolation member (130) from the near end to the far end.

10. The interventional catheter assembly according to claim 7, characterized in that, The distal end of the second delivery cavity (120) terminates at the position of the guide member (122).

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