Extended suction catheter and suction catheter system

Abstract

The utility model provides an extension aspiration catheter and aspiration catheter system.The extension aspiration catheter comprises an extension tube body, a push rod and a plugging assembly, a conveying channel used for conveying medical instruments is arranged in the extension tube body, and a leading-in opening communicated with the conveying channel is formed in the near end of the extension tube body; the far end of the push rod is connected with the near end of the extension tube body; the extension tube body is sleeved with the plugging assembly, the plugging assembly is located at the position close to the near end of the extension tube body, the near end and the far end of the plugging assembly are connected to the extension tube body, the plugging assembly is provided with a self-expansion structure, and the middle of the plugging assembly has an initial contraction state and a self-expansion unfolding state relative to the near end and the far end of the plugging assembly. According to the utility model, the suction capacity of the suction catheter and the guide catheter can be enhanced and prolonged, and the thrombus and plaque suction effect is improved. The plugging assembly does not need to be pressurized, and the plugging assembly can be self-expanded and plug the gap between the guide catheter and the extension tube body.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an extended aspiration catheter and aspiration catheter system. Background Technology

[0002] There are two interventional treatment approaches for thrombus aspiration: one is the coronary aspiration catheter, and the other is a combination of an extension catheter and a guiding catheter in a single-tube configuration. The former suffers from poor aspiration efficiency due to its smaller lumen, and its longer effective tube length makes the procedure more cumbersome and inconvenient. Furthermore, its poor flexibility prevents it from reaching complex and tortuous anatomical locations. The latter, using a single-tube configuration, allows the extension catheter to guide the guiding catheter during the procedure, enabling deeper treatment of collateral vessels and lesions far from the aorta. It also provides excellent stent delivery capabilities, allowing access to complex anatomical structures to deliver balloons or stents. However, the combination of the extension catheter and guiding catheter still presents some challenges: the gap between them results in a loss of aspiration pressure, reducing the negative pressure effect for thrombus and plaque aspiration and leading to poor aspiration results. It also fails to address microcirculatory damage caused by thrombus and plaque detachment.

[0003] Therefore, it is necessary to provide an extended aspiration catheter that can seal the gap between the extended aspiration catheter and the guiding catheter to enhance the aspiration capacity of the extended aspiration catheter and the guiding catheter, improve the effect of aspirating thrombi and plaques, solve the problem of microcirculation damage caused by thrombus and plaque detachment, enhance the effect of percutaneous coronary intervention, and provide an aspiration catheter system with the extended aspiration catheter. Utility Model Content

[0004] The primary objective of this invention is to provide an extended aspiration catheter that can seal the gap between itself and the guiding catheter, thereby enhancing the aspiration capacity of both the extended aspiration catheter and the guiding catheter, improving the aspiration effect on thrombi and plaques, resolving the microcirculation damage caused by thrombus and plaque detachment, and enhancing the efficacy of percutaneous coronary intervention.

[0005] The second objective of this invention is to provide an aspiration catheter system having an extended aspiration catheter that can seal the gap between the extended aspiration catheter and the guiding catheter, thereby enhancing the aspiration capacity of the extended aspiration catheter and the guiding catheter, improving the aspiration effect of thrombus and plaque, solving the problem of microcirculation damage caused by thrombus and plaque detachment, and enhancing the effect of percutaneous coronary intervention.

[0006] To achieve the aforementioned first objective, this utility model provides an extended aspiration catheter, comprising an extended tube body, a push rod, and a sealing assembly. The extended tube body has a delivery channel for delivering medical devices, and the proximal end of the extended tube body has an inlet communicating with the delivery channel. The distal end of the push rod is connected to the proximal end of the extended tube body. The sealing assembly is sleeved on the extended tube body and located near the proximal end of the extended tube body. The proximal and distal ends of the sealing assembly are respectively connected to the extended tube body, and the sealing assembly has a self-expanding structure. The middle part of the sealing assembly has an initial contracted state and a self-expanding unfolded state relative to its proximal and distal ends.

[0007] Compared with existing technologies, the extended aspiration catheter of this invention enhances the aspiration capacity of both the extended aspiration catheter and the guiding catheter by incorporating a sealing component on the extension tube body and utilizing the self-expanding structure of the sealing component to seal the gap between the guiding catheter and the extension tube body. This improves the effectiveness of aspirating thrombi and plaques, addresses the microcirculation damage caused by thrombus and plaque detachment, and enhances the efficacy of percutaneous coronary intervention. Furthermore, the self-expanding structure of the sealing component eliminates the need for pressurization, as it self-expands and seals the gap between the guiding catheter and the extension tube body, making it simple and convenient to operate.

[0008] Preferably, the sealing assembly includes a deformable skeleton and a sealing membrane. The deformable skeleton is sleeved on the extension tube body, and the proximal end and distal end of the deformable skeleton are respectively connected to the extension tube body. The sealing membrane covers the inner or outer surface of the deformable skeleton.

[0009] Preferably, the deformable skeleton is made of an elastic material, a shape memory alloy, or a shape memory polymer, and the sealing membrane is a polymer film.

[0010] Preferably, the radial cross-section of the deformed skeleton is circular after expansion.

[0011] Preferably, the extension tube body includes an inner layer, a middle reinforcing layer and an outer layer arranged sequentially from the inside to the outside, and the conveying channel is located at the center of the inner layer.

[0012] Preferably, the intermediate reinforcing layer is a woven mesh layer, a spring layer, or a spiral-cut tube layer.

[0013] Preferably, the intermediate reinforcing layer is divided into a compliant region, a transition region, and a pushing region in the direction from the far end to the near end, and the flexibility of the compliant region, the transition region, and the pushing region decreases in that order.

[0014] Preferably, the extension tube body is provided with a metal connector at the proximal end of the intermediate reinforcing layer, the distal end of the push rod is connected to one end of the metal connector, and the other end of the metal connector is arranged parallel to the intermediate reinforcing layer or connected to the intermediate reinforcing layer.

[0015] Preferably, the metal connector is a metal ring arranged side by side along the axial direction of the extension tube body, or the metal connector has a spiral structure.

[0016] Preferably, the metal connector is welded to the distal end of the push rod to form a welding area, and at the welded connection between the metal connector and the push rod, the diameter of the push rod is reduced.

[0017] To achieve the second objective mentioned above, this utility model provides a suction catheter system, including a guide tube and the aforementioned extended suction catheter. The guide tube has a guide channel, and the extended suction catheter passes through the delivery channel. The sealing component is located within the delivery channel, and the delivery channel communicates with the guide channel. The sealing component is in a self-expanding state and abuts against the inner wall of the guide channel to seal the gap.

[0018] Compared with existing technologies, the aspiration catheter system of this invention features an extended aspiration catheter. This extended aspiration catheter, by incorporating a sealing component on its body and utilizing the self-expanding structure of the sealing component, seals the gap between the guiding catheter and the extended catheter body. This enhances the aspiration capacity of both the extended and guiding catheters, improves the aspiration of thrombi and plaques, addresses microcirculatory damage caused by thrombus and plaque detachment, and enhances the efficacy of percutaneous coronary intervention. Furthermore, the self-expanding structure of the sealing component eliminates the need for pressurization; it self-expands and seals the gap between the guiding catheter and the extended catheter body, offering simple and convenient operation. Because the sealing component is self-expanding, it can seal the guiding channels of guiding catheters with different inner diameters, expanding the product's applicability.

[0019] Preferably, when the sealing assembly is in the self-expanding and unfolding state and abuts against the inner wall of the guide channel, the sealing assembly can slide along the inner wall of the guide channel. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the extended suction catheter of this utility model.

[0021] Figure 2 This is a structural diagram of the suction catheter system of this utility model.

[0022] Figure 3 yes Figure 2The diagram shows the structure of the aspiration catheter system at the distal end of the guide tube.

[0023] Figure 4 This is a structural diagram of the first embodiment of the sealing component of the extended suction catheter of this utility model.

[0024] Figure 5 This is a structural diagram of a third embodiment of the sealing component of the extended suction catheter of this utility model.

[0025] Figure 6 This is a cross-sectional view of the extended suction catheter of this utility model.

[0026] Figure 7 This is a diagram showing the connection structure between the metal connector and the push rod of the extended suction cannula of this utility model.

[0027] Figure 8 This is a structural diagram of the intermediate reinforcing layer of the extended suction catheter of this utility model.

[0028] Figure 9 This is a structural comparison diagram of the suction catheter system of this utility model and the traditional suction system.

[0029] Figure 10 yes Figure 9 The diagram shows a comparison of the cross-sectional structure of the aspiration catheter system of this invention at the proximal position with that of a conventional aspiration system at the proximal position. Detailed Implementation

[0030] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0031] Please see Figures 1 to 6The aspiration catheter system 200 of this utility model includes a guide tube 201 and an extended aspiration catheter 100. The extended aspiration catheter 100 includes an extended tube body 1, a push rod 2, and a sealing assembly 3. The extended tube body 1 has a delivery channel 11 for delivering medical devices, and the proximal end of the extended tube body 1 has an inlet 12 communicating with the delivery channel 11. The distal end of the push rod 2 is connected to the proximal end of the extended tube body 1. The sealing assembly 3 is sleeved on the extended tube body 1 and located near the proximal end of the extended tube body 1. The proximal and distal ends of the sealing assembly 3 are respectively connected to the extended tube body 1, and the sealing assembly 3 has a self-expanding structure. The middle part of the sealing assembly 3 has an initial contracted state and a self-expanding deployed state relative to its proximal and distal ends. The guide tube 201 has a guide channel 201a, and the extended suction tube 100 passes through the delivery channel 11. The sealing component 3 is located in the delivery channel 11, and the delivery channel 11 is connected to the guide channel 201a. The sealing component 3 is in a self-expanding and unfolding state, and it abuts against the inner wall of the guide channel 201a to seal the gap. Figures 3 to 5 As shown, the sealing component 3 is in a self-expanding and unfolding state. Specifically, the sealing component 3 is in a fully self-expanding and unfolding state when not under pressure; when the sealing component 3 is located within the guide channel 201a, it is subjected to the compressive force of the inner wall of the conveying channel 11, causing it to shrink partially. At this time, the sealing component 3 is in a certain degree of self-expanding and unfolding state under pressure, and the diameter of the sealing component 3 is equal to the inner diameter of the guide channel 201a.

[0032] Specifically, the extended suction catheter 100 is inserted into the guide channel 201a, and the distal end of the extended tube body 1 extends out from the distal end of the guide channel 201a, the proximal end of the extended tube body 1 is located in the guide channel 201a, and the proximal end of the push rod 2 is located outside the proximal end of the guide channel 201a.

[0033] In one embodiment, when the sealing component 3 is in a self-expanding and unfolding state and abuts against the inner wall of the guide channel 201a, the sealing component 3 can slide along the inner wall of the guide channel 201a.

[0034] Please see Figure 4 and Figure 5 In one embodiment, the sealing component 3 includes a deformable skeleton 31 and a sealing membrane 32. The deformable skeleton 31 is sleeved on the extension tube body 1, and the proximal end and distal end of the deformable skeleton 31 are respectively connected to the extension tube body 1. The sealing membrane 32 covers the inner or outer surface of the deformable skeleton 31.

[0035] In one embodiment, the deformable frame 31 includes a plurality of first deformable elements 311, which are arranged along the circumferential direction of the extension tube body 1, and the proximal and distal ends of the first deformable elements 311 are respectively connected to the extension tube body 1. Since the first deformable elements 311 are capable of deformation, the middle portion of the first deformable element 311, in its self-expanding state, will abut against the inner wall of the guide tube 201. Furthermore, a sealing membrane 32 covers the deformable frame 31. When the first deformable element 311 abuts against the inner wall of the guide tube 201, the first deformable element 311 causes the sealing membrane 32 to unfold, increasing the area occupied by the sealing membrane 32, thereby sealing the gap between the guide tube 201 and the extension tube body 1.

[0036] Furthermore, in one embodiment, the deformable skeleton 31 further includes a plurality of second deformable elements 312, which are arranged intersectingly with the first deformable elements 311. The second deformable elements 312 and the first deformable elements 311 can be combined by weaving to form the deformable skeleton 31, but this is not a limitation. For example, the deformable skeleton 31 can also be carved into a hollow shape.

[0037] In one embodiment, the radial cross-section of the deformable skeleton 31 is circular after expansion. For example, the circle can be spherical, quasi-spherical, elliptical, or quasi-elliptical, but is not limited thereto.

[0038] In one embodiment, such as Figure 4 As shown, the second deformation members 312 are arranged at intervals along the axial direction of the extension tube body 1. However, this is not a limitation; for example, in other embodiments, such as... Figure 5 As shown, the second deformable components 312 are arranged in a cross pattern.

[0039] In one embodiment, the deformable skeleton 31 is made of an elastic material, a shape memory alloy, or a shape memory polymer, and the occlusion membrane 32 is a polymer film. The deformable skeleton 31 can consist of multiple nickel-titanium alloy sheets surrounding the outer periphery of the extension tube body 1, utilizing the shape memory function of the nickel-titanium alloy to form a spherical or near-spherical deformable skeleton 31. The nickel-titanium alloy deformable skeleton 31 expands and unfolds within the guiding tube 201, abutting against the inner wall of the guiding tube 201. This allows the occlusion component 3 to seal the gap between the extension tube body 1 and the guiding tube 201, fully utilizing the guiding channel 201a of the guiding tube 201 and integrating the guiding channel 201a of the guiding tube 201 with the delivery channel of the extension tube body 1, significantly improving the aspiration efficiency of the thrombus aspiration catheter. Furthermore, the extension tube body 1 also has the capability to deliver balloons or stents. The occlusion membrane 32 can be a PET film, nylon, or Pebax film.

[0040] In one embodiment, the first deformable member 311 and the second deformable member 312 are either linear or curved.

[0041] Please see Figures 6 to 8 In one embodiment, the catheter body 1 includes an inner layer 13, a middle reinforcing layer 14, and an outer layer 15 arranged sequentially from the inside out, with the delivery channel 11 located at the center of the inner layer 13. This three-layer composite structure provides strong support, pressure resistance, and flexural strength.

[0042] By configuring the extension tube body 1 with an inner layer 13, a middle reinforcing layer 14 and an outer layer 15, the extension tube body 1 has good toughness, strength and sealing, so that the extension tube body 1 can smoothly reach complex anatomical structures and provide good stent delivery capability.

[0043] The inner layer 13 is made of polytetrafluoroethylene (PTFE) or linear low-density polyethylene (LLDPE). PTFE has high lubricity and non-stick properties, facilitating the passage of other instruments through the conveying channel 11 within the inner layer 13. LLDPE has high softening and melting temperatures, and boasts advantages such as high strength, good toughness, high rigidity, good heat and cold resistance. It also exhibits good resistance to environmental stress cracking, impact strength, and tear strength.

[0044] The outer layer 15 is made of one or more mixtures of polyether-tipped polyamide, nylon, and polyurethane elastomer, ensuring that the outer surface of the catheter body 1 has a smoother appearance and feel, and fully protecting the blood vessels from thrombosis 300, dissection, etc.

[0045] The hardness of the outer layer 15 decreases progressively from the proximal end to the distal end of the catheter body 1. This not only avoids deformation but also makes it easier to pass through tortuous lesion sites. The use of a flexible material at the distal end avoids damage to the blood vessel wall during advancement, better meeting the needs of catheter advancement within human blood vessels. This allows doctors to operate more precisely and conveniently while reducing patient discomfort during the procedure.

[0046] The intermediate reinforcing layer 14 is a braided mesh layer, a spring layer, or a spiral-cut tube layer, which can improve the strong support, pressure resistance, and flexural strength of the guide extension type suction catheter 100.

[0047] In one embodiment, the intermediate reinforcing layer 14 is a braided mesh layer made of metal wire, such as nickel-titanium alloy wire or stainless steel wire. In one embodiment, the braided mesh layer is woven using a one-over-one or one-over-two method. In one embodiment, the braided mesh layer is woven with 8-16 strands of metal wire, and the PPI of the braided mesh layer is 20-120. In one embodiment, the braided mesh layer uses round wire with a diameter of 0.001-0.01 inches. In another embodiment, the braided mesh layer uses flat wire with a width of 0.001-0.01 inches and a thickness of 0.001-0.005 inches. In one embodiment, the PPI of the proximal end of the braided mesh layer is greater than that of the distal end, which can help the manufactured extension tube body 1 to have better flexibility and accessibility at the distal end and better pushing performance at the proximal end. For example, using 0.01-inch round wire, the PPI of the braided mesh layer is 20 at the distal end and 120 at the proximal end. PPI stands for "Picks Per Inch," which refers to the sum of the number of warp and weft threads per inch. This is an important indicator for measuring the density of woven fabric; a higher PPI value generally means a denser woven fabric.

[0048] In one embodiment, the intermediate reinforcing layer 14 is a spring layer, which is made of wound metal wire, which can be nickel-titanium alloy wire and / or stainless steel wire, wherein the wire diameter has a pitch of 0.01mm-0.3mm and the pitch is 0.03mm-0.3mm. In one embodiment, the proximal end of the spring layer is wound with stainless steel wire, and the distal end is wound with nickel-titanium alloy wire. In one embodiment, the pitch at the proximal end of the spring layer is greater than the pitch at the distal end, which can help the distal end of the manufactured extension tube body 1 to have better flexibility and accessibility, and the proximal end to have better pushing performance. For example, the distal end of the spring layer uses nickel-titanium alloy wire with a diameter of 0.05mm and a pitch of 0.1mm, and the proximal end uses stainless steel wire with a diameter of 0.08mm and a pitch of 0.08mm.

[0049] like Figure 8 As shown, in one embodiment, the intermediate reinforcing layer 14 is divided into a compliant region 141, a transition region 142, and a pushing region 143 from the distal end to the proximal end, with the flexibility of the compliant region 141, transition region 142, and pushing region 143 decreasing sequentially. Further, in an optional embodiment, the length of the compliant region 141 is 1-30 cm, or the length of the transition region 142 is 2-50 cm, or the length of the pushing region 143 is 5-50 cm. Of course, in other optional embodiments, the lengths of the compliant region 141 (1-30 cm), the transition region 142 (2-50 cm), and the pushing region 143 (5-50 cm) can be incorporated into the same embodiment.

[0050] In one embodiment, the intermediate reinforcing layer 14 is a helical-cut tube layer. Using a helical-cut tube layer ensures sufficient strength while providing superior flexibility, making it more adaptable to complex vascular pathways and reducing irritation and damage to blood vessels. It also provides a more uniform distribution of support, avoiding localized stress concentration and improving catheter stability within the blood vessel. Furthermore, the helical-cut tube layer design results in a smaller outer diameter and a more compact structure, thereby reducing the overall outer diameter of the extension aspiration catheter 100, simplifying insertion and minimizing impact on blood vessels. It is also lighter, helping to reduce the patient's feeling of a foreign body.

[0051] Furthermore, such as Figure 8 As shown, when the intermediate reinforcing layer 14 is a spiral-cut tube layer,

[0052] The compliant zone 141, the transition zone 142, and the push zone 143 satisfy at least one of the following characteristics;

[0053] The slit length L of the spiral cut tube layer in the compliant zone 141 is greater than the slit length L of the spiral cut tube layer in the transition zone 142, which is greater than the slit length L of the spiral cut tube layer in the pushing zone 143.

[0054] Alternatively, the cutting spacing d of the spiral cutting tube layer in the compliant zone 141 is less than the cutting spacing d of the spiral cutting tube layer in the transition zone 142, which is less than the cutting spacing d of the spiral cutting tube layer in the pushing zone 143.

[0055] Alternatively, the slit angle θ of the spiral cut tube layer in the compliant zone 141 is less than the slit angle θ of the spiral cut tube layer in the transition zone 142, which is less than the slit angle θ of the spiral cut tube layer in the pushing zone 143.

[0056] Alternatively, the pitch p of the spiral cutting tube layer in the compliant zone 141 is less than the pitch p of the spiral cutting tube layer in the transition zone 142, which is less than the pitch p of the spiral cutting tube layer in the pushing zone 143.

[0057] It should be noted that the four parameters of the three zones of the spiral cutting tube layer—compliance zone 141, transition zone 142, and pushing zone 143—namely, the kerf length L, kerf spacing d, kerf angle θ, and pitch p, can be designed according to the above variation rules for one or more of these parameters, or all of them can be designed according to the above variation rules.

[0058] It should also be noted that in this application, the slit angle θ is the angle between the slit and the central axis of the catheter.

[0059] By controlling the slit length L, slit spacing d, slit angle θ, and pitch p of the spiral-cut tube layer, the flexibility of the extension tube body 1 can be altered, dividing it into a compliant zone 141, a transition zone 142, and a pushing zone 143. It is well known that the longer the slit length L, the smaller the slit spacing d, the smaller the slit angle θ, or the smaller the pitch p, the more compliant the tube body and the stronger its throughput.

[0060] Correspondingly, the compliant region 141 of the spiral cutting tube layer has a longer slit length L, a smaller slit spacing d, a smaller slit angle θ, and a smaller pitch p, making this region compliant and better able to adapt to complex vascular pathways, thus improving the passage capacity of the extension tube body 1 within the blood vessel. A smooth transition is achieved between the compliant region 141 and the pushing region 143 through the transition region 142, maintaining a certain degree of compliance to adapt to changes while gradually increasing the ease of pushing. The pushing region 143 employs a shorter slit length L, a larger slit spacing d, a larger slit angle θ, and a larger pitch p, making this region more powerful during pushing, facilitating accurate delivery of the catheter to the target position.

[0061] The reasonable design of different regional characteristics allows the extension tube body 1 to have both good flexibility and effective pushing ability, meeting the operational needs at different stages and improving the success rate and safety of the surgery.

[0062] Specifically, in this embodiment, the slit length of the spiral cutting tube layer in the compliant zone 141 is 0.6 mm, the cutting spacing is 0.1 mm, the slit angle is 95°, the pitch is 0.09 mm, and the slit width is 0.02 mm.

[0063] The spiral cut of the tube layer in transition zone 142 has a cut length of 0.4 mm, a cut spacing of 0.3 mm, a cut angle of 105°, a pitch of 0.12 mm, and a slit width of 0.02 mm.

[0064] The thread cutting slit length of the thread cutting tube layer in the push area 143 is 0.1mm, the cutting spacing is 0.6mm, the slit angle is 115°, the thread pitch is 0.30mm, and the slit width is 0.02mm.

[0065] Please see Figure 6 and Figure 7 The extension tube body 1 has a metal connector 4 near the proximal end of the intermediate reinforcing layer 14, and the distal end of the push rod 2 is connected to one end of the metal connector 4. The other end of the metal connector 4 is arranged parallel to the intermediate reinforcing layer 14, or the other end of the metal connector 4 is connected to the intermediate reinforcing layer 14. Figure 6 As shown, the other end of the metal connector 4 is arranged side by side with the intermediate reinforcing layer 14.

[0066] like Figure 6As shown, in one embodiment, the metal connector 4 is a metal ring arranged side-by-side along the axial direction of the extension tube body 1, disposed within the intermediate reinforcing layer 14 near one end of the push rod 2. Its cross-sectional shape is the same as that of the intermediate reinforcing layer 14. Axially along the guide tube 201, the side of the metal connector 4 away from the push rod 2 is parallel to but not connected to the intermediate reinforcing layer 14, while the side of the metal connector 4 near the push rod 2 is connected to the push rod 2. The metal connector 4 uses a metal ring and is connected by welding, ensuring the stability of the connection between the extension tube body 1 and the push rod 2, and guaranteeing the transmission of force during operation.

[0067] like Figure 7 As shown, in one embodiment, the metal connector 4 has a spiral structure, which can effectively buffer the stress concentration at the connection between the push rod 2 and the extension tube body 1, and also provide effective bending resistance for the extension tube body 1. In addition, the spiral structure of the metal connector 4 can provide a certain degree of elasticity and adaptability, making it more adaptable to different situations during connection and force transmission.

[0068] In other embodiments, the metal connector 4 may also include a connecting piece and a plurality of connecting strips connected to opposite sides of the connecting piece, the connecting piece and each connecting strip connecting to the intermediate reinforcing layer, the push rod connecting to the connecting piece, and each connecting strip wrapping around and connecting to the inner layer.

[0069] In one embodiment, the metal connector 4 and the push rod 2 can be connected by welding, gluing, or other methods.

[0070] like Figure 7 As shown, in one embodiment, the metal connector 4 is welded to the distal end of the push rod 2 to form a welding area 41. Specifically, welding areas 41 are respectively provided at both ends of the connection between the metal connector 4 and the push rod 2 to form a welded connection between the metal connector 4 and the push rod 2. Further, at the welded connection between the metal connector 4 and the push rod 2, the diameter of the push rod 2 is reduced so that the overall outer diameter does not increase, which is beneficial to its passage within the blood vessel and reduces damage to the blood vessel.

[0071] Please see Figure 6In one embodiment, a first imaging element 22 is provided at the distal end of the push rod 2. Specifically, the first imaging element 22 is inserted into the distal end of the push rod 2, or the first imaging element 22 is sleeved on the distal end of the push rod 2, or the first imaging element 22 is welded to the distal end of the push rod 2, for imaging and displaying the position of the sealing component 3, allowing for precise positioning within the patient's body under X-ray, reducing the difficulty of operation. The provision of the first imaging element 22 facilitates accurate display of the position of the sealing component 3 through imaging during surgery, helping to improve the accuracy and safety of the operation. The first developing element 22 can be made of a filament made of an X-ray-impermeable developing material, such as gold wire, tungsten wire, platinum wire, or platinum-iridium alloy wire. The filament-shaped first developing element 22 can be inserted after hollowing out the distal end of the push rod 2, but this is not a limitation. The first developing element 22 can also be made of an annular or block-shaped body made of an X-ray-impermeable developing material, such as gold, tungsten, platinum, or platinum-iridium alloy. The annular developing element 22 can be fitted onto the distal end of the push rod 2, while the block-shaped first developing element 22 can be welded to the distal end of the push rod 2.

[0072] Please see Figure 6 In one embodiment, a second imaging element 16 is provided at the distal end of the extension tube body 1. By providing the second imaging element 16, the position of the distal end of the extension tube body 1 can be visualized and displayed, allowing for precise positioning within the patient's body under X-ray, thus reducing the difficulty of operation.

[0073] Please see Figure 1 In one embodiment, the extended suction catheter 100 further includes a handle 5, the distal end of which is connected to the proximal end of the push rod 2. In this embodiment, the connection between the handle 5 and the push rod 2 is a welded connection. Preferably, the handle 5 is flat to facilitate gripping and turning with the fingers.

[0074] During interventional treatment, the operator can directly hold the handle 5 to smoothly advance the extension tube body 1 into the body. The push rod 2 provides good support and pushing force for guiding the extension tube body 1 to ensure the smooth progress of the procedure. The push rod 2 can be made of stainless steel with a polished outer surface to improve the safety of interventional treatment.

[0075] In one embodiment, to reduce the friction between the extension aspiration catheter 100 and the guiding catheter 201, a hydrophilic coating is provided on the surface of both the extension catheter body 1 and the sealing component 3, allowing the extension aspiration catheter 100 to smoothly reach the distal end of the vascular malformation. In another embodiment, the hydrophilic coating is added to the surface of the extension catheter body 1 and the sealing component 3 using methods such as dipping or spraying. To reduce thrombus adhesion to the push rod 2, a hydrophobic coating is provided on the surface of the push rod 2. In one embodiment, the hydrophobic coating is added to the surface of the push rod 2 using methods such as dipping or spraying. This hydrophobic coating can be made of existing PTFE material, but is not limited to it.

[0076] Please see Figure 2 In one embodiment, the proximal end of the push rod 2 is provided with an indicator 21 for indicating that the sealing assembly 3 has reached the distal position of the delivery channel 11. The indicator 21 indicates that the sealing assembly 3 has reached the distal position of the delivery channel 11, prompting the operator not to continue pushing the extension tube body 1 further distally. Otherwise, the sealing assembly 3 would slide out of the distal end of the guide tube 201, thus failing to seal the gap between the extension tube body 1 and the guide tube 201. Specifically, when the push rod 2 moves toward the distal end, the indicator 21, approaching the proximal end of the guide tube 201, reminds the operator to limit the push rod 2 from continuing to move toward the distal end of the guide tube 201, preventing the sealing assembly 3 from sliding out of the guide tube 201.

[0077] Please see Figure 1 and Figure 2 In one embodiment, a Y-shaped connecting valve 203 is provided at the proximal end of the guiding catheter 201. The Y-shaped connecting valve 203 has a first interface 203a and a second interface 203b, which are respectively connected to the guiding channel 201a. The extended aspiration catheter 100 is inserted into the first interface 203a, and the proximal end of the push rod 2 is located outside the Y-shaped connecting valve 203. During interventional treatment, the guidewire 202 passes through the first interface 203a.

[0078] In one embodiment, after the extended aspiration catheter 100 of this application seals the guide channel 201a of the guide tube 201, contrast agent or other fluid medium can be injected through the Y-type connecting valve on the guide tube 201. The medium can flow down along the guide channel 201a of the guide tube 201 into the delivery channel 11 of the extension tube body 1 of the extended aspiration catheter 100 for superselective angiography or other targeted therapy.

[0079] When the sealing component 3 is in its self-expanding and unfolding state, the outer wall of the sealing component 3 abuts against the inner wall of the guide channel 201a of the guide tube 201. The diameter of the sealing component 3 is equal to the inner diameter of the guide channel 201a, so that the extended suction catheter 100 is effectively connected to the guide tube 201 and forms a sealed suction cavity. Figure 9 and Figure 10 As shown, the suction catheter system 200 of this application has a larger average suction inner diameter compared with the conventional suction system 400.

[0080] Among them, according to the Hagen-Poiseuille equation (1):

[0081]

[0082] The following pattern can be observed: When the average inner diameter r of the system increases, the flow resistance R decreases. Consequently, the flow rate of the aspiration catheter system 200 increases. Therefore, the aspiration catheter system 200 has a larger proximal aspiration lumen compared to the traditional aspiration system 400, resulting in a greater average flow resistance and ultimately a greater flow rate during aspiration. During thrombus aspiration, as the extended aspiration catheter 100 is withdrawn, the aspiration length L of the system shortens, similarly leading to a decrease in system flow resistance and an increase in aspiration flow rate, while the lumen of the traditional aspiration catheter 401 remains unchanged.

[0083] Where ΔP is the pressure difference between the two ends of the catheter, L is the overall length of the catheter system, Q is the flow rate of the catheter in this case, r is the radius of the lumen, and μ is the viscosity of the liquid.

[0084] The above Hagen-Poiseuille equation can be converted to obtain the flow rate of the suction catheter system 200, which is given by equation (2):

[0085]

[0086] Combination Figure 9 and Figure 10 When the pressure difference at both ends is the same (e.g., both are negative pressure generated by a 30ml syringe), the flow rate Q of the aspiration catheter system 200 of this application is... B Compared to traditional suction systems with a flow rate of 400 Q A The relationship can be derived, and equation (3) is:

[0087]

[0088] From the above formula, we can know that Q A <Q BTherefore, under the same negative pressure, the suction catheter system 200 has a larger flow rate than the traditional suction system 400, resulting in higher suction efficiency. At the same time, as the extended suction catheter 100 is withdrawn from the guide tube 201, the length of the suction catheter system 200 becomes shorter. According to equation (2), the flow rate of the suction system will continue to increase, thereby improving the suction efficiency.

[0089] Combination Figures 1 to 10 Taking the aspiration of thrombi 300 into a small blood vessel as an example, the specific working principle of the aspiration catheter system 200 of this application is as follows:

[0090] Entering the target area: Thrombus 300 is in a small blood vessel. A guiding catheter 201 is delivered to a larger blood vessel near the small vessel. A guidewire 202 is delivered along the first port 203a of the Y-shaped connecting valve 203 at the proximal end of the guiding catheter 201 to the location of the thrombus 300 in the small blood vessel. An extension aspiration catheter 100 is delivered along the guidewire 202. The extension aspiration catheter 100 extends into the guiding catheter 201 from the first port 203a of the Y-shaped connecting valve 203 at the proximal end of the guiding catheter 201. The distal end of the extension tube body 1 of the extension aspiration catheter 100 extends from the distal end of the guiding catheter 201, while the proximal end of the extension tube body 1 is located within the guiding channel 201a. One end of the push rod 2 is located within the guiding channel 201a, and the other end of the push rod 2 extends from the first port 203a of the Y-shaped connecting valve 203. The handle 5 is located outside the Y-shaped connecting valve 203. Guided by the guidewire 202, the extension tube body 1 reaches the desired position. Since the extension tube body 1 contains a push rod 2, the push rod 2 can be used to apply force, making it easy for the extension aspiration catheter 100 to enter branch vessels and narrow vessels.

[0091] Establishing a transmission channel: When the blocking component 3 is located in the guide channel 201a, the blocking component 3 will shrink part of its volume due to the squeezing force of the inner wall of the conveying channel 11. At this time, the blocking component 3 will be in a certain degree of self-expansion state under pressure, and the diameter of the blocking component 3 is equal to the inner diameter of the guide channel 201a. The blocking component 3 can slide in the guide channel 201a. The blocking component 3 blocks the gap between the guide tube 201 and the extension tube body 1. The guide channel 201a of the guide tube 201 is connected to the conveying channel 11 of the extension tube body 1.

[0092] Delivery of contrast agent / drug: The first port 203a of the push rod 2 extending from the Y-shaped connecting valve 203 of the guiding tube 201 is blocked, and the contrast agent / drug is delivered through the second port 203b of the Y-shaped connecting valve 203. The contrast agent / drug flows along the guiding channel 201a into the delivery channel 11 of the extension tube body 1, and then flows out at the distal end of the extension tube body 1. The contrast agent / drug flows to the distal end of the small blood vessel, thereby performing superselective contrast / targeted drug delivery.

[0093] External aspirator aspirates thrombi 300 and plaques: The first port 203a extending from the push rod 2 at the Y-shaped connecting valve 203 of the guide tube 201 is blocked. An aspirator is connected to the second port 203b of the Y-shaped connecting valve 203 to aspirate thrombi 300 and plaques from the distal end of the extension tube body 1. Under negative pressure, the thrombi 300 or calcified plaques flow back along the delivery channel 11 of the extension tube body 1 to the guide channel 201a until they are extracted from the body.

[0094] Withdrawal: The extension aspiration catheter 100, the guiding catheter 201, and the guide wire 202 of the aspiration catheter system 200 are withdrawn from the body together.

[0095] In summary, the aspiration catheter system 200 of this utility model includes an extended aspiration catheter 100. This extended aspiration catheter 100, by setting a sealing component 3 on the extension tube body 1 and utilizing the self-expanding structure of the sealing component 3, seals the gap between the guiding tube 201 and the extension tube body 1, thereby enhancing the aspiration capacity of the extended aspiration catheter 100 and the guiding tube 201, improving the aspiration effect of thrombi 300 and plaques, solving the microcirculation damage problem caused by thrombus 300 and plaque detachment, and enhancing the effect of percutaneous coronary intervention. Furthermore, utilizing the self-expanding structure of the sealing component 3, there is no need to pressurize the sealing component 3; it can self-expand and seal the gap between the guiding tube 201 and the extension tube body 1, making it simple and convenient to operate. Moreover, because the sealing component 3 is a self-expanding structure, it can seal the guiding channels 201a of guiding tubes 201 with different inner diameters, expanding the product's applicability.

[0096] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. An extended aspiration catheter, characterized in that, include: The extension tube body has a delivery channel for delivering medical devices, and the proximal end of the extension tube body has an inlet communicating with the delivery channel. A push rod, the distal end of which is connected to the proximal end of the extension tube body; A plugging assembly is sleeved on the extension tube body and located near the proximal end of the extension tube body. The proximal and distal ends of the plugging assembly are respectively connected to the extension tube body. The plugging assembly has a self-expanding structure. The middle part of the plugging assembly has an initial contracted state and a self-expanding unfolded state relative to its proximal and distal ends.

2. The extended aspiration catheter according to claim 1, characterized in that, The plugging assembly includes a deformable skeleton and a plugging membrane. The deformable skeleton is sleeved on the extension tube body, and the proximal end and distal end of the deformable skeleton are respectively connected to the extension tube body. The plugging membrane covers the inner or outer surface of the deformable skeleton.

3. The extended aspiration catheter according to claim 2, characterized in that, The deformable skeleton is made of elastic material, shape memory alloy or shape memory polymer material, and the sealing membrane is a polymer film.

4. The extended aspiration catheter according to claim 2, characterized in that, The radial cross-section of the deformed skeleton becomes circular after expansion.

5. The extended aspiration catheter according to claim 1, characterized in that, The extension tube body includes an inner layer, a middle reinforcing layer and an outer layer arranged sequentially from the inside to the outside, and the conveying channel is located at the center of the inner layer.

6. The extended aspiration catheter according to claim 5, characterized in that, The intermediate reinforcing layer is a woven mesh layer, a spring layer, or a spiral-cut tube layer.

7. The extended aspiration catheter according to claim 6, characterized in that, The intermediate reinforcing layer is divided into a compliant zone, a transition zone, and a pushing zone from the far end to the near end, with the flexibility of the compliant zone, the transition zone, and the pushing zone decreasing sequentially.

8. The extended aspiration catheter according to claim 6, characterized in that, The extension tube body is provided with a metal connector at the near end of the intermediate reinforcing layer, the far end of the push rod is connected to one end of the metal connector, and the other end of the metal connector is arranged in parallel with the intermediate reinforcing layer or connected to the intermediate reinforcing layer.

9. The extended aspiration catheter according to claim 8, characterized in that, The metal connector is a metal ring arranged side by side along the axial direction of the extension tube body, or the metal connector has a spiral structure.

10. The extended aspiration catheter according to claim 9, characterized in that, The metal connector is welded to the distal end of the push rod to form a welding area, and at the welded connection between the metal connector and the push rod, the diameter of the push rod is reduced.

11. A suction catheter system, characterized in that, The device includes a guide tube and an extended suction catheter as described in any one of claims 1-10. The guide tube has a guide channel, the extended suction catheter passes through the delivery channel, and the blocking component is located in the delivery channel. The delivery channel is connected to the guide channel. The blocking component is in a self-expanding state and abuts against the inner wall of the guide channel to block the gap between the guide tube and the extension tube body.

12. The aspiration catheter system according to claim 11, characterized in that, When the sealing assembly is in the self-expanding and unfolding state and abuts against the inner wall of the guide channel, the sealing assembly can slide along the inner wall of the guide channel.

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