A dual lumen thrombus aspiration catheter assembly

Abstract

This invention provides a dual-lumen thrombus aspiration catheter assembly, belonging to the field of interventional medical device technology. The assembly includes an aspiration tube body with an aspiration cavity and a guide cavity arranged parallel along the axial direction. The proximal end of the aspiration cavity is used to connect to a negative pressure aspiration device, and the distal end has an aspiration port. A distal protection unit is slidably inserted within the guide cavity. The distal protection unit has a guide portion and an interception portion located distal to the guide portion. The interception portion has a compressed state and an expanded state. During operation, the compressed distal protection unit is transported to the distal end of the target location along with the aspiration tube body. After the interception portion of the distal protection unit detaches from the guide cavity, it expands and supports itself at a set position to intercept any thrombi that fall during the operation. The aspiration cavity of the aspiration tube body can move along the guide portion to adjust the position of the aspiration port. This invention primarily addresses the technical problems in existing technologies where adjusting the position of the aspiration catheter requires repeated establishment of guidewire pathways, and the distal protection requires additional instruments, leading to long operation times and high risks.

Description

Technical Field

[0001] This invention belongs to the field of interventional medical device technology, specifically relating to a dual-lumen thrombus aspiration catheter assembly. Background Technology

[0002] In the clinical treatment of acute ischemic vascular diseases (such as acute ischemic stroke, acute myocardial infarction, peripheral artery embolism, etc.), thrombectomy is one of the core techniques for rapidly removing thrombi from blood vessels and restoring blood flow perfusion through interventional means. This technique relies on a thrombectomy catheter as the core instrument. A negative pressure environment is established at the catheter tip to directly aspirate the thrombus, thereby relieving vascular obstruction.

[0003] The typical workflow for a traditional aspiration catheter is as follows: First, a microguidewire is passed through the thrombus lesion to reach the distal end of the blood vessel. Then, the aspiration catheter is advanced along the microguidewire to the proximal end of the thrombus. To ensure unobstructed aspiration channels, the guidewire needs to be withdrawn from the catheter lumen before aspiration. Then, a negative pressure aspiration device is connected for aspiration.

[0004] However, since the guidewire is withdrawn during aspiration, the catheter tip loses its crucial guiding support structure. If complete recanalization is not achieved after the initial aspiration, and the operator needs to adjust the aspiration port position of the aspiration catheter for repeated aspiration, the operator must completely withdraw the catheter, re-establish the guidewire access, and re-deliver the catheter. This process prolongs the operation time, is cumbersome, and delays recanalization. Furthermore, to reduce the risk of distal embolism, a combined distal protection and aspiration approach is typically used clinically. Before the aspiration catheter is in place, an independent distal protection device (such as a balloon occlusion catheter or a filter-type protection device) is delivered to the distal vessel of the thrombus via interventional means. Distant protection is achieved by blocking blood flow with a balloon or capturing the embolus with a filter. However, this approach requires at least 2-3 additional surgical steps, including the delivery, positioning, release, and retrieval of the protection device, which not only prolongs the operation time but also consumes additional specialized instruments, significantly increasing medical costs. Meanwhile, repeated delivery and manipulation of multiple instruments increases mechanical stimulation to the blood vessel wall, raising the incidence of vasospasm and intimal injury. Furthermore, the protective devices themselves also pose operational risks such as inaccurate positioning and release failure, further increasing the complexity of the surgery.

[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 a dual-lumen thrombus aspiration catheter assembly to solve the technical problems in the prior art, such as the need to repeatedly establish guidewire access for adjusting the position of the aspiration catheter, and the need for additional instruments for distal protection, which leads to long operation time, high cost and high risk.

[0007] To achieve the above objectives, the dual-lumen thrombus aspiration catheter assembly of the present invention provides the following technical solution: A dual-lumen thrombus aspiration catheter assembly includes an aspiration tube body having an aspiration cavity and a guide cavity arranged parallel along the axial direction. The proximal end of the aspiration cavity is used to connect to a negative pressure aspiration device, and the distal end has an aspiration port. A distal protection unit is slidably disposed within the guide cavity. The distal protection unit has a guiding part and an intercepting part located distal to the guiding part. The intercepting part has a compressed state and an expanded state. During operation, the compressed distal protection unit is transported to the distal end of the target location along with the suction tube. After the interception part of the distal protection unit detaches from the guide cavity, it expands and supports itself in the set position to intercept blood clots that fall during the operation. The suction cavity of the suction tube can be moved along the guide part to adjust the position of the suction port.

[0008] As a further optimized technical solution, the interception part includes a dense net support and a support ring, with the support ring disposed near the end of the dense net support so that the near end of the dense net support is locked in a set position.

[0009] As a further optimized technical solution, the support ring is elliptical and forms an acute angle with the axial direction of the guide portion.

[0010] As a further optimized technical solution, the support ring is provided with soft elastic particles to increase friction.

[0011] As a further optimized technical solution, the dense mesh support is woven from superelastic metal or polymer material filaments, which expands in a free state and contracts radially into a compressed state under radial constraint.

[0012] As a further optimized technical solution, the cross-sectional area of ​​the suction cavity is larger than the cross-sectional area of ​​the guide cavity.

[0013] As a further optimized technical solution, a protective sleeve is provided at the distal end of the guide cavity. The protective sleeve has a first position where it retracts into the guide cavity to wrap the interception part and a second position where it flips out of the guide cavity to prevent thrombi from entering the guide cavity.

[0014] As a further optimized technical solution, the size of the distal opening after the protective sleeve is turned outward is smaller than the size of the connection between its proximal end and the guide cavity.

[0015] As a further optimized technical solution, the protective sleeve has an enlarged diameter area in the middle to facilitate smooth inward folding after wrapping the interceptor.

[0016] As a further optimized technical solution, the dual-lumen thrombus aspiration catheter assembly also includes an operating handle, which has a main channel for connecting the aspiration cavity and a branch channel for connecting the guide cavity.

[0017] Beneficial effects: Compared with the prior art, the present invention integrates the aspiration chamber and the guide chamber into one unit through the dual-lumen design of the aspiration tube body. The distal protection unit can slide along the guide chamber. During the aspiration process, the position of the aspiration port can be adjusted without removing the distal protection unit, avoiding the cumbersome steps of repeatedly removing the catheter and reconstructing the guidewire passage in the traditional technology. This significantly shortens the operation time and buys valuable recanalization time for patients with acute ischemic diseases. At the same time, after the interception part is released, the guide part of the distal protection unit remains in the guide chamber, providing a stable sliding support component for the aspiration catheter. This allows the operator to push or pull the aspiration catheter forward or back along the guide component to adjust the accurate position of the aspiration port when the initial aspiration is unsatisfactory or when the aspiration position needs to be adjusted after the initial aspiration. There is no need to completely remove the catheter from the body and re-establish the access, which enables rapid, continuous and precise aspiration, improving surgical efficiency and success rate. In addition, the arrangement of the interception section enters the blood vessel together with the aspiration tube body, establishing an interception barrier in advance at the distal end of the thrombus lesion. This can effectively capture thrombus fragments that may fall off during the aspiration process, thereby preventing distal vascular embolism. It also effectively reduces the repeated delivery and manipulation of instruments, improves surgical safety, and not only shortens the operation time and saves on specialized instruments, but also significantly reduces medical costs.

[0018] Furthermore, the elliptical structure of the support ring and the design of soft elastic particles enhance positioning stability while reducing mechanical stimulation to the blood vessel wall, thus lowering the incidence of vascular spasm and intimal damage.

[0019] Furthermore, by setting a flexible protective sleeve that can be folded inwards and outwards at the distal end of the guide cavity, the protective sleeve retracts and wraps around the outside of the intercepting part during delivery, effectively avoiding frictional loss between the drug coating (such as anti-proliferation and anti-thrombotic coating) attached to the outer surface of the intercepting part and the inner wall of the guide cavity during delivery, thus ensuring the integrity of the drug efficacy. When the intercepting part is pushed out of the guide cavity, the intercepting part folds out along with the protective sleeve. In this way, during the relative sliding process with the guide cavity, the protective sleeve isolates the intercepting part from direct friction and also avoids the loss of the drug coating attached to the outer surface of the intercepting part. When the protective sleeve is naturally carried and folded outside the guide cavity, in this state, the protective sleeve forms a physical isolation barrier outside the opening of the guide cavity, effectively preventing thrombus fragments from flowing back into the guide cavity during the aspiration operation, avoiding poor sliding or operational failure of the guide part due to cavity blockage, thereby ensuring the smooth recovery of the intercepting part. 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: Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the dual-lumen thrombus aspiration catheter assembly of the present invention; Figure 2 This is a schematic diagram of the distal structure of Embodiment 1 of the dual-lumen thrombus aspiration catheter assembly of the present invention; Figure 3 This is a schematic diagram of the working state of Embodiment 1 of the dual-lumen thrombus aspiration catheter assembly of the present invention; Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of the dual-lumen thrombus aspiration catheter assembly of the present invention; Figure 5 This is a sectional view of the distal structure of Embodiment 2 of the dual-lumen thrombus aspiration catheter assembly of the present invention. At this time, the protective sleeve is located in the first position. Figure 6 This is a schematic diagram of the distal structure of Embodiment 2 of the dual-lumen thrombus aspiration catheter assembly of the present invention. At this time, the protective sleeve is located in the second position. Figure 7 This is a schematic diagram of a working state of Embodiment 2 of the dual-lumen thrombus aspiration catheter assembly of the present invention; Figure 8 This is a schematic diagram of another working state of Embodiment 2 of the dual-lumen thrombus aspiration catheter assembly of the present invention.

[0021] In the diagram: 100, suction tube body; 110, suction chamber; 120, guide chamber; 130, arc-shaped partition wall; 200, remote protection unit; 210, guide section; 220, interception section; 221, dense mesh support; 222, support ring; 223, soft elastic granules; 300, protective sleeve; 310, diameter expansion area; 400, operating handle; 410, main pipe; 420, branch pipe. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] This invention provides a dual-lumen thrombus aspiration catheter assembly, primarily addressing the technical problems of existing aspiration catheters requiring repeated guidewire access for position adjustment and relying on additional instruments for distal protection, leading to cumbersome and risky surgical procedures. The assembly includes an aspiration tube body 100 and a distal protection unit 200. The aspiration tube body 100 has parallel and independent aspiration cavities 110 and guide cavities 120. The distal protection unit 200 is slidably inserted within the guide cavity 120, with its distal end being an expandable / compressible interceptor 220 and its proximal end a guide 210. In operation, the interceptor 220 expands and anchors after being pushed to the distal end of the target vessel, forming a protective barrier; the aspiration tube body 100 can slide back and forth along the guide 210 placed within the guide cavity 120, enabling flexible adjustment of the aspiration port position and continuous aspiration. Preferably, a foldable protective sleeve 300 is also provided at the distal end of the guide cavity 120. During delivery, the protective sleeve 300 covers the interceptor section 220 to prevent wear on its surface coating. After the interceptor section 220 is released, the protective sleeve 300 flips outward, causing the distal openings of the aspiration chamber 110 and the guide chamber 120 to be misaligned. This avoids the risk of thrombi entering the guide chamber 120 while the aspiration chamber 110 is working, ensuring smooth sliding of the guide section 210 and successful retrieval of the interceptor section 220. This invention integrates aspiration and distal protection functions. The distal protection unit guides the aspiration chamber for position adjustment, eliminating the need for repeated catheter withdrawal, reducing surgical steps and instrument consumption, and lowering the risk of embolism and vascular injury.

[0027] Example 1 like Figure 1As shown in the figure, this embodiment provides a dual-lumen thrombus aspiration catheter assembly, which includes an aspiration tube body 100, a distal protection unit 200, and an operating handle 400.

[0028] The suction tube body 100 is made of flexible medical polymer material (such as medical-grade polytetrafluoroethylene). The tube length is set to 120cm-150cm according to clinical needs, and the outer diameter is 3.0mm-5.0mm. The suction tube body 100 has a suction chamber 110 and a guide chamber 120 arranged axially in parallel, independent of each other by a central arc-shaped partition wall 130. The cross-sectional area of ​​the suction chamber 110 is 2.5-4 times that of the guide chamber 120 to ensure suction efficiency. The proximal end of the suction chamber 110 is sealed and connected to the main pipe 410 of the operating handle 400. The end of the main pipe 410 is equipped with a standard Luer locking interface, allowing for quick docking with mainstream negative pressure suction devices on the market. The proximal end of the guide chamber 120 is connected to the branch pipe 420 of the operating handle 400.

[0029] The remote protection unit 200 is slidably inserted into the guide cavity 120. The remote protection unit 200 includes a guide part 210 and an interception part 220. The interception part 220 is located at the distal end of the guide part 210 and has a compressed state and an expanded state. The proximal end of the guide part 210 extends to the outside along the branch pipe 420 of the operating handle 400 to facilitate operator operation.

[0030] In practice, the compressed distal protection unit 200 is delivered along with the suction tube 100 to the distal end of the location where the thrombus needs to be aspirated. At this time, the intercepting part 220 is in a contracted state, facilitating smooth passage through the stenotic segment and thrombus area of ​​the blood vessel. When the intercepting part of the distal protection unit 200 is separated from the guide cavity 120, it automatically expands under its own structural characteristics and supports itself in a set position within the blood vessel (it is necessary to ensure that the proximal end of the intercepting part 220 is at a suitable distance from the thrombus, and the specific position is adjusted appropriately according to the patient's condition), forming a thrombus interception barrier to intercept thrombi that fall during the operation, effectively reducing the risk of distal embolism. At the same time, the suction cavity 110 of the suction tube 100 can move along the guide part 210 to adjust the position of the suction port. Precise adjustment of the suction position can be achieved without withdrawing the entire catheter, greatly simplifying the surgical procedure and improving surgical efficiency.

[0031] In this embodiment, the guide section 210 is a section of nickel-titanium alloy guide wire coated with a hydrophilic coating to reduce frictional resistance with the guide cavity 120. The interception section 220 is fixed to the distal end of the guide section 210 by medical laser welding. The interception section 220 has a dense mesh support 221 and a support ring 222. The dense mesh support 221 is woven from superelastic metal or polymer material wire. The superelastic metal can be nickel-titanium alloy, and the polymer material can be polyetheretherketone. These materials have excellent biocompatibility and shape memory properties, allowing the dense mesh support 221 to expand in a free state for reliable interception, and to contract radially under radial constraint for easy delivery through the guide cavity 120.

[0032] like Figure 2 As shown, the support ring 222 is an elliptical nickel-titanium alloy ring, fixed to the proximal end of the dense mesh stent 221 by laser welding, so as to fix the proximal end of the dense mesh stent 221 in the predetermined position of the blood vessel. The outer surface of the support ring 222 is uniformly distributed with soft elastic particles 223 made of silicone material, which can both enhance the friction between the support ring 222 and the blood vessel wall, preventing displacement of the interception part 220, and avoiding mechanical damage to the vascular intima. Specifically, in this embodiment, the support ring 222 has a metal support wire inside and a silicone tube on the outside. By using transversely fastening rings spaced at intervals on the tube, the shape of the tube between any two fixing rings bulges radially outward relative to the position of the fixing rings, forming soft elastic particles 223.

[0033] Furthermore, to optimize the support and positioning effect, the support ring 222 is elliptical and forms an acute angle with the axial direction of the guide part 210. This structural design allows the support ring 222 to have a larger contact area with the blood vessel wall and fit more tightly, thereby effectively reducing the pressure damage to the blood vessel wall.

[0034] The working process of this embodiment is as follows: like Figure 3 As shown, firstly, the interceptor 220 of the distal protection unit 200 is compressed and inserted into the guide cavity 120, so that the interceptor 220 is completely contained within the guide cavity 120. At this time, the mesh support 221 is in a contracted state. The negative pressure suction device is connected through the main pipe 410 to check the sealing of the suction cavity 110. Then, the operator holds the operating handle 400 and delivers the distal end of the suction tube 100 along the vascular access. Under the guidance of the imaging equipment, the suction tube 100 is pushed to the distal end of the thrombus lesion area, while ensuring that the interceptor 220 of the distal protection unit 200 to be released is located in the normal vascular segment distal to the thrombus.

[0035] Push the proximal end of the guide section 210 and simultaneously retract the suction tube 100, causing the interception section 220 to dislodge from the distal end of the guide cavity 120. After dislodgement, the dense mesh stent 221 automatically expands, and the support ring 222 fits tightly against the blood vessel wall, so that the interception section 220 is stably fixed in the set position, forming a thrombus interception barrier.

[0036] The suction tube 100 is withdrawn to the proximal end of the thrombus, and then the negative pressure suction device is activated to suction the thrombus through the suction port of the suction chamber 110. If the thrombus is not completely removed after the first suction, the operating handle 400 can be pushed or pulled to slide the suction tube 100 along the guide part 210 to adjust the position of the suction port. Suction can be performed again without withdrawing the catheter.

[0037] After aspiration is completed, the negative pressure aspiration device is turned off, and the proximal end of the guide part 210 is pulled, so that the interception part 220 is pulled back into the guide cavity 120. The dense mesh support 221 is constrained by the guide cavity 120 and retracts again. Then the entire catheter assembly is slowly withdrawn from the body.

[0038] Example 2 like Figure 4-8 As shown, this embodiment is based on embodiment 1, but with the addition of a protective sleeve 300 at the distal end of the guide cavity 120. The rest of the structure is basically the same as that of embodiment 1.

[0039] In Example 1, since the guide cavity 120 is aligned with the distal end of the aspiration cavity 110, although the proximal end of the guide cavity 120 is not connected to a negative pressure aspiration device, during the aspiration of the thrombus in the aspiration cavity 110, the thrombus will rapidly collide with the aspiration port under negative pressure. During this collision, the thrombus will inevitably fragment, making it easy to enter the guide cavity 120, which is flush with the aspiration port. This makes it prone to jamming when the guide cavity 120 moves along the guide section 210, and also affects the retraction of the interceptor section 220. Furthermore, the interceptor section 220 typically has a drug coating on its outer side; when it is compressed within the guide cavity 120 and slides along it, the drug coating is easily worn away.

[0040] To further optimize the function of the dual-lumen thrombus aspiration catheter assembly, in this embodiment, a protective sleeve 300 is provided at the distal end of the guide cavity 120. The protective sleeve 300 is made of medical polyurethane film, which has good elasticity and toughness. The proximal end of the protective sleeve 300 is fixed to the distal port of the guide cavity 120 by heat fusion welding. The protective sleeve 300 has two working positions: the first position is the contracted state, in which the protective sleeve 300 is folded inward and accommodated in the guide cavity 120, wrapping the interception part 220 in the expansion area 310; the second position is the outward state, in which the protective sleeve 300 is folded out from the guide cavity 120, with the distal opening facing the blood vessel wall.

[0041] In this way, when the interceptor 220 is in the delivery state, the protective sleeve 300 retracts and wraps around the outside of the interceptor 220, effectively preventing the frictional loss of the drug coating (such as anti-proliferation and anti-thrombotic coating) attached to the outer surface of the interceptor 220 with the inner wall of the guide cavity 120 during delivery, thus ensuring the integrity of the drug efficacy. When the interceptor 220 is pushed out of the guide cavity 120, the interceptor 220 and the protective sleeve 300 are folded out as a whole. In this way, during the relative sliding process with the guide cavity 120, the protective sleeve 300 isolates the interceptor 220 from direct friction and also prevents the drug coating attached to the outer surface of the interceptor from being lost during delivery. The protective sleeve 300 is naturally carried and folded outside the guide cavity 120. In this state, due to the presence of the protective sleeve 300, the guide cavity 120 and the distal opening of the suction cavity 110 are misaligned. This can effectively prevent thrombus fragments at the suction port from entering the guide cavity 120. That is, the protective sleeve 300 forms a physical isolation barrier outside the guide cavity opening, effectively preventing thrombus fragments from flowing back into the guide cavity 120 during the suction operation. This avoids the guide part 210 from sliding poorly or failing to operate due to blockage of the guide cavity 120, thereby ensuring the smooth recovery of the interception part 220.

[0042] Furthermore, the distal opening of the protective sleeve 300 after being turned outward is smaller than the size of the connection between its proximal end and the guide cavity 120, which can further effectively prevent thrombi or debris from entering the guide cavity 120 during aspiration, ensuring that the sliding of the guide part 210 is not obstructed.

[0043] Furthermore, the protective sleeve 300 has an expanded diameter region 310 in the middle. The design of the expanded diameter region 310 allows the protective sleeve 300 to fold inward smoothly when wrapping the intercepting part 220, and it is not easy to cause axial wrinkles or interference.

[0044] The working process of this embodiment is as follows: First, the intercepting part 220 of the remote protection unit 200 is compressed axially, causing the dense mesh support 221 to contract, while the drug coating remains intact. The compressed intercepting part 220 is then pushed from the remote end into the expanded diameter area 310 of the protective sleeve 300, ensuring that the axis of the intercepting part 220 coincides with the axis of the protective sleeve 300. Subsequently, the protective sleeve 300 is folded inward and pushed into the guide cavity 120 until the proximal end of the protective sleeve 300 is completely folded into the guide cavity 120. A negative pressure suction device is then connected through the main pipe 410 for pressure testing.

[0045] Guided by the imaging equipment, the operator holds the operating handle 400 and guides the distal end of the suction tube 100 along the pre-established vascular pathway until the suction port of the suction chamber 110 reaches the distal end of the thrombus. At this time, the intercepting part 220 and the protective sleeve 300 are still in the contracted state within the guide chamber 120 and are located in the normal vascular segment distal to the thrombus.

[0046] Pushing the proximal end of the guide section 210 while simultaneously retracting the suction tube 100 causes the intercepting section 220, carrying the protective sleeve 300, to dislodge from the distal end of the guide cavity 120. At this point, the protective sleeve 300 follows the intercepting section 220 out of the guide cavity 120. After dislodgement, the dense mesh stent 221 automatically expands, and the support ring 222 fits tightly against the blood vessel wall, stabilizing the intercepting section 220 in the designated position and forming a thrombus interception barrier.

[0047] The suction tube 100 is withdrawn to the proximal end of the thrombus, and then the negative pressure suction device is activated to suction the thrombus through the suction port of the suction chamber 110. If the thrombus is not completely removed after the first suction, the operating handle 400 can be pushed or pulled to slide the suction tube 100 along the guide part 210 to adjust the position of the suction port. Suction can be performed again without withdrawing the catheter.

[0048] After the thrombus is removed, the negative pressure suction device is turned off, and the guide section 210 is slowly retracted. The expanded mesh support 221 gradually contracts under the tension of the guide section 210 and the constraint of the protective sleeve 300, while the protective sleeve 300 is folded inward along the original folding path and retracted into the guide cavity 120. After the intercepting section 220 has completely returned to the guide cavity 120, the entire catheter assembly is slowly withdrawn from the body by holding the operating handle 400.

[0049] In this embodiment, the protective sleeve 300 is designed to give the present invention the following advantages: First, by integrating and folding the protective sleeve 300 with the interceptor 220, the problem of friction and wear between the drug coating of the interceptor 220 and the guide cavity 120 in the traditional structure is completely solved, the drug coating retention rate is effectively improved, and the sustained-release effect of the drug is guaranteed; Second, the reverse barrier effect after the protective sleeve is folded down effectively reduces the blockage rate of the guide cavity 120, and ensures smooth sliding of the guide 210 and smooth recovery of the interceptor 220.

[0050] In summary, the dual-lumen thrombus aspiration catheter assembly provided by this invention combines aspiration function with distal protection function through a dual-lumen integrated design, solving the problems of cumbersome operation, long operation time, high cost and high risk in traditional technology, and has significant clinical application value.

[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 are within the protection scope of the present invention.

Claims

1. A dual lumen thrombus aspiration catheter assembly, comprising: The device includes a suction tube body (100), which has a suction cavity (110) and a guide cavity (120) arranged in parallel along the axial direction. The proximal end of the suction cavity (110) is used to connect to a negative pressure suction device, and the distal end has a suction port. A distal protection unit (200) is slidably disposed in the guide cavity (120). The distal protection unit (200) has a guide part (210) and an interception part (220) located at the distal end of the guide part (210). The interception part (220) has a compressed state and an expanded state. During operation, the compressed remote protection unit (200) is delivered to the remote end of the target location along with the suction tube body (100). After the interception part (220) of the remote protection unit (200) is separated from the guide cavity (120), it expands and supports itself in the set position to intercept blood clots that fall during the operation. The suction cavity (110) of the suction tube body (100) can be moved along the guide part to adjust the position of the suction port. A protective sleeve (300) is provided at the distal end of the guide cavity (120). The protective sleeve (300) has a first position that retracts into the guide cavity (120) to wrap the interceptor (220) and a second position that flips out of the guide cavity (120) to prevent thrombi from entering the guide cavity (120). The protective sleeve (300) at the first position is used to protect the integrity of the external drug coating of the interceptor (220). The protective sleeve (300) at the second position makes the guide cavity (120) and the distal opening of the aspiration cavity (110) staggered to avoid fragments of thrombus at the aspiration port from entering the guide cavity (120).

2. The dual lumen thrombus aspiration catheter assembly of claim 1, wherein, The interception part (220) includes a dense net support (221) and a support ring (222). The support ring (222) is disposed near the dense net support (221) so that the near end of the dense net support (221) is locked in a set position.

3. The dual-lumen thrombus aspiration catheter assembly according to claim 2, characterized in that, The support ring (222) is elliptical and forms an acute angle with the axial direction of the guide part (210).

4. The dual-lumen thrombus aspiration catheter assembly according to claim 2, characterized in that, The support ring (222) is provided with soft elastic particles (223) to increase friction.

5. The dual-lumen thrombus aspiration catheter assembly according to claim 2, characterized in that, The dense mesh support (221) is woven from superelastic metal or polymer material filaments. It is in an expanded state in a free state and in a compressed state in a radially constrained state.

6. The dual-lumen thrombus aspiration catheter assembly according to claim 1, characterized in that, The cross-sectional area of ​​the suction cavity (110) is greater than the cross-sectional area of ​​the guide cavity (120).

7. The dual-lumen thrombus aspiration catheter assembly according to claim 1, characterized in that, The size of the distal opening of the protective sleeve (300) after it is turned outward is smaller than the size of the connection between its proximal end and the guide cavity (120).

8. The dual-lumen thrombus aspiration catheter assembly according to claim 7, characterized in that, The protective sleeve (300) has an enlarged diameter area (310) in the middle to allow it to fold inward smoothly after wrapping the interceptor (220).

9. The dual-lumen thrombus aspiration catheter assembly according to any one of claims 1-8, characterized in that, The dual-lumen thrombus aspiration catheter assembly also includes an operating handle (400), which has a main conduit (410) for connecting the aspiration chamber (110) and a branch conduit (420) for connecting the guide chamber (120).

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