Suction catheter assembly

Abstract

The utility model relates to the technical field of medical instruments, in particular to a suction catheter assembly, which comprises a guide catheter, the suction extension catheter is installed in an inner cavity of the guide catheter in the length direction of the guide catheter, a radial gap is reserved between the suction extension catheter and the guide catheter, a plugging ring is fixedly installed on the outer side wall of the suction extension catheter, the plugging ring is in sliding sealing fit with the inner side wall of the guide catheter, and the plugging ring is arranged away from the head of the suction extension catheter; and the drawing push rod is fixedly mounted at the tail part of the suction extension catheter, and one end, deviating from the suction extension catheter, of the drawing push rod extends out of the guide catheter. During operation, the suction extension catheter can be installed in place only by pushing the drawing push rod, so that the operation steps of the suction catheter assembly are simplified, the operation difficulty is reduced, and the operation efficiency when the suction catheter assembly is used for thrombus suction can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a suction catheter assembly. Background Art

[0002] The guide extension catheter and guide catheter serve as a thrombus aspiration system. The system has excellent instrument delivery capabilities and the ability to deeply insert the catheter in complex lesions. However, due to the gap between the inner diameter of the guide catheter and the outer diameter of the guide extension catheter, there is a certain amount of negative pressure loss during the thrombus aspiration process, and ultimately the system's aspiration capacity is greatly reduced, which will undoubtedly increase the risk of microcirculation embolism during the operation.

[0003] To eliminate the negative pressure damage caused by the gap between the catheters during surgery, the existing technology adds a compliant balloon to the proximal end of the guide extension catheter body to seal the gap between the guide extension catheter and the guide catheter, thereby achieving aspiration of the thrombus at the lesion site. However, within the limited gap space, adding a balloon filling cavity system will reduce the inner cavity size of the aspiration catheter, which will undoubtedly reduce the aspiration efficiency of the aspiration catheter. At this time, the filling capacity of the filling cavity will be greatly limited. At the same time, if the basic premise of ensuring that each joint is sufficiently firm is required, it will undoubtedly place high demands on the manufacturing precision of the product. Moreover, the addition of the balloon inflation system will increase the number of operating steps during the surgery, extending the operation time. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art thrombus aspiration system composed of a guide extension catheter and a guide catheter, such as high manufacturing precision and low surgical efficiency, thereby providing an aspiration catheter assembly.

[0005] In order to solve the above technical problems, the present invention provides a suction catheter assembly, comprising:

[0006] guide catheter;

[0007] The suction extension catheter is installed in the inner lumen of the guide catheter along the length direction of the guide catheter, with a radial gap reserved between the suction extension catheter and the guide catheter. A sealing ring is fixedly installed on the outer wall of the suction extension catheter, and the sealing ring is in sliding and sealing cooperation with the inner wall of the guide catheter. The sealing ring is arranged away from the head of the suction extension catheter;

[0008] The pulling push rod is fixedly installed at the tail end of the suction extension catheter, and the pulling push rod is away from one end of the suction extension catheter and extends to the outside of the guide catheter.

[0009] Optionally, a plurality of occluding rings are arranged at intervals along the length direction of the suction extension catheter.

[0010] Optionally, the axial cross-section of the sealing ring is an arc on the side facing the guide tube.

[0011] Optionally, the axial cross-section of the sealing ring is an isosceles trapezoid.

[0012] Optionally, a Y-shaped rotary connecting valve is installed at the tail end of the guide catheter, and a connecting portion is provided at one end of the Y-shaped rotary connecting valve away from the guide catheter, which is suitable for cooperating and fixing with the outer tube catheter seat, and the side branch of the Y-shaped rotary connecting valve is suitable for connecting to external instruments.

[0013] Optionally, a suction oblique opening is provided at the opening of the tail of the suction extension conduit, and the pulling push rod is fixedly connected to the longer side of the suction oblique opening.

[0014] Optionally, a developing member is installed at the head of the guide catheter and / or the suction extension catheter.

[0015] Optionally, the guide catheter and / or the suction extension catheter includes a flexible inner layer, a reinforcement layer and a flexible outer layer arranged in sequence from the inside to the outside, and the reinforcement layer is made of stainless steel or nickel titanium wire.

[0016] Optionally, the flexible inner layer is made of polytetrafluoroethylene; and / or the flexible outer layer is made of polyurethane, polyamide or polyether block polyamide.

[0017] Optionally, the sealing ring and the suction extension catheter are an integrally formed structure.

[0018] The technical solution of this utility model has the following advantages:

[0019] 1. The suction catheter assembly provided by the present invention includes: a guide catheter; a suction extension catheter, which is installed in the inner cavity of the guide catheter along the length direction of the guide catheter, with a radial gap reserved between the suction extension catheter and the guide catheter, and a sealing ring is fixedly installed on the outer wall of the suction extension catheter, and the sealing ring is slidingly and sealingly engaged with the inner wall of the guide catheter, and the sealing ring is arranged away from the head of the suction extension catheter; a pulling push rod, which is fixedly installed at the tail end of the suction extension catheter, and the pulling push rod extends to the outside of the guide catheter away from one end of the suction extension catheter.

[0020] When using the suction catheter assembly to aspirate a thrombus, first extend the front end of the guide catheter into the operating position of the diseased blood vessel in the patient's body. The suction extension catheter enters the patient's body along the inner cavity of the guide catheter. Since the occluding ring is set away from the head of the suction extension catheter, when the suction extension catheter enters the interior of the guide catheter by pushing the pull rod, the occluding ring is located outside the guide catheter, ensuring that the suction extension catheter can move quickly inside the guide catheter. When the occluding ring enters the guide catheter, the occluding ring and the inner cavity of the guide catheter are slid and sealed. The occluding ring can seal the radial gap between the guide catheter and the suction extension catheter. When the suction extension catheter continues to advance into the interior of the guide catheter, it can slowly advance under the action of the friction between the occluding ring and the inner cavity of the guide catheter, so that it can be stably positioned at the surgical operation position in the patient's body. When making the aspiration catheter assembly, it is only necessary to set a sealing ring on the outside of the aspiration extension catheter, and there is no need to set a complex balloon matching structure. The manufacturing precision of the aspiration catheter assembly is low; and during operation, it is only necessary to push the pull rod to install the aspiration extension catheter in place, which simplifies the operation steps of the aspiration catheter assembly, reduces the difficulty of operation, and can greatly improve the operational efficiency when using the aspiration catheter assembly for thrombus aspiration.

[0021] 2. The suction catheter assembly provided by the present invention provides a plurality of sealing rings spaced apart along the length direction of the suction extension catheter, and utilizes the plurality of sealing rings to seal the radial gap between the suction extension catheter and the guide catheter respectively, thereby achieving multi-pass sealing of the radial gap and improving the stability of the assembly during operation.

[0022] 3. The axial cross-section of the occluding ring in the suction catheter assembly provided by this invention is curved toward the guide catheter. This creates linear contact between the occluding ring and the inner wall of the guide catheter, ensuring the sealing of the radial gap while reducing friction between the occluding ring and the guide catheter. This improves the smoothness of the suction extension catheter after the occluding ring enters the guide catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of the suction catheter assembly provided in an embodiment of the present utility model.

[0025] Figure 2 for Figure 1 Cross-sectional view along the A-A direction.

[0026] Figure 3 This is a schematic structural diagram of the suction extension catheter provided in an embodiment of the present utility model.

[0027] Figure 4 This is a schematic structural diagram of a suction extension catheter provided in another embodiment of the present invention.

[0028] Figure 5 This is a schematic structural diagram of a suction extension catheter provided in another embodiment of the present invention.

[0029] Figure 6 This is a schematic structural diagram of a suction extension catheter provided in another embodiment of the present invention.

[0030] Figure 7 This is a schematic structural diagram of a suction extension catheter provided in another embodiment of the present invention.

[0031] Figure 8 This is a schematic structural diagram of a suction extension catheter provided in another embodiment of the present invention.

[0032] Explanation of the accompanying reference numerals: 1. Guide catheter; 2. Suction extension catheter; 3. Development component; 4. Sealing ring; 5. Catheter seat; 6. Suction bevel; 7. Pull-out push rod; 8. Pull-out handle; 9. Y-shaped rotary connecting valve; 10. Radial gap. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Figures 1 to 3 The figure shows a suction catheter assembly provided by this embodiment, which includes a guide catheter 1, a suction extension catheter 2 and a pulling push rod 7.

[0038] The suction extension catheter 2 is installed within the lumen of the guide catheter 1 along its length, with a radial gap 10 reserved between the suction extension catheter 2 and the guide catheter 1. A sealing ring 4 is fixedly mounted on the outer wall of the suction extension catheter 2, slidingly and sealingly engaging with the inner wall of the guide catheter 1. The sealing ring 4 is positioned away from the tip of the suction extension catheter 2. In this embodiment, the sealing ring 4 and the suction extension catheter 2 are integrally molded. To facilitate molding of the sealing ring 4 onto the suction extension catheter 2, the axial cross-section of the sealing ring 4 is rectangular or isosceles trapezoidal.

[0039] A pull-out push rod 7 is fixedly mounted at the rear end of the suction extension catheter 2. The end of the pull-out push rod 7, facing away from the suction extension catheter 2, extends outside the guide catheter 1. To facilitate insertion of surgical instruments into the suction extension catheter 2, a suction bevel 6 is provided at the rear end of the suction extension catheter 2. The pull-out push rod 7 is fixedly connected to the longer side of the suction bevel 6.

[0040] To connect external devices such as syringes to the guide catheter 1 and provide a connection port for negative pressure devices such as external syringes, a Y-shaped rotary connection valve 9 is installed at the rear end of the guide catheter 1. The end of the Y-shaped rotary connection valve 9, facing away from the guide catheter 1, is provided with an external threaded connection portion suitable for mating with an external catheter hub. The side branches of the Y-shaped rotary connection valve 9 are suitable for connecting to external devices. To facilitate positioning of the guide catheter 1 within the patient's body, a developing device 3 is installed at the head of the guide catheter 1.

[0041] In the aspiration catheter assembly provided in this embodiment, guide catheter 1 is used to establish a pathway to the target diseased vessel under the guidance of a guide wire, providing a stable platform for the deployment of subsequent instruments and ensuring non-invasiveness to surrounding vessels. Aspiration extension catheter 2 is combined with guide catheter 1 to form a parent-child catheter for use, providing stronger support for the system and facilitating the delivery and placement of interventional instruments. Its larger lumen allows for stronger suction, enabling the aspiration of larger volumes of thrombus. The swivel connection valve is adapted for sealingly connecting to the catheter hub 5 via a threaded connection, providing a connection port for negative pressure instruments such as external syringes.

[0042] The inner diameter of the lumen of the guide catheter 1 is a full diameter design, and the tube body of the guide catheter 1 and the catheter seat 5 are fixed together by gluing or injection molding. The suction extension catheter 2 adopts a constant diameter or distal diameter reduction design, and the suction extension catheter 2 and the suction bevel 6, the suction bevel 6 and the pulling push rod 7 are connected by welding, and the pulling handle 8 is fixed to the pulling push rod 7 by injection molding or other means. In some other embodiments, the suction bevel 6 is directly formed on the tail of the suction extension catheter 2. The outer diameter of the suction extension catheter 2 is slightly smaller than the inner diameter of the guide catheter 1. The distal ends of the suction extension catheter 2 and the guide catheter 1 are both designed with a developing ring as a developing part 3 or contain a developing component.

[0043] There is a radial gap 10 between the suction extension catheter 2 and the inner cavity of the guide catheter 1 to ensure good passability of the instruments. In order to ensure that there is no loss of negative pressure during the thrombus aspiration process, a ring-shaped sealing ring 4 is set on the outer wall of the suction extension catheter 2 away from the head of the suction extension catheter 2. The sealing ring 4 is composed of one or more layers of materials stacked together and tightly fixed on the outer wall of the suction extension catheter 2. The outer surface of the sealing ring 4 is made of a low-friction coefficient material to reduce the resistance during relative movement between the sealing ring 4 and the inner wall of the guide catheter 1, and does not affect the passability between the guide catheter 1 and the extension catheter. The sealing ring 4 is made of a material with good elasticity, so that it can fit tightly against the inner wall of the guide catheter 1 without being easily deformed; the axial width of the sealing ring 4 is designed to be narrow, which further optimizes its passability while ensuring its sealing performance.

[0044] When using the aspiration catheter assembly to remove thrombus, the aspiration extension catheter 2 is delivered to the operative location of the diseased vessel via the guide catheter 1, and the local gap between the aspiration extension catheter 2 and the guide catheter 1 is blocked by the occluding ring 4. The aspiration extension catheter 2 can quickly extract thrombus and can also be used to deliver external devices such as stents and percutaneous transluminal coronary angioplasty balloons for percutaneous transluminal coronary angioplasty treatment. During percutaneous coronary intervention, the aspiration extension catheter 2 is used, and the occluding ring 4 tightly fits the inner wall of the guide catheter 1 to achieve positioning of the guide catheter 1 and block blood flow in the vessel.

[0045] The suction extension catheter 2 passes through the arm of the Y-shaped rotary connecting valve 9 and is extended in the length direction through the guide catheter 1, thereby reaching the position of the diseased blood vessel. In this way, the suction extension catheter 2 can deliver devices such as stents to the distal end of the blood vessel through the guide catheter 1. An external syringe or the like can be connected to the arm of the Y-shaped rotary connecting valve 9 for manual aspiration of thrombus. When the suction extension catheter 2 and the guide catheter 1 are matched, there is a gap in the radial direction. An annular sealing ring 4 is provided on the outer surface of the tube body of the suction extension catheter 2, which is pressed against the elastic inner wall of the guide catheter 1 to achieve local sealing of the lumen gap. During the aspiration process, the thrombus can only be extracted from the body through the lumen of the suction extension catheter 2, and cannot be aspirated from the gap between the guide catheter 1 and the suction extension catheter 2. In this way, the negative pressure generated in this way will not be dispersed and lost, so the suction effect is better.

[0046] The sealing ring 4 has a small friction coefficient and good elasticity, and does not affect the direct passability of the suction extension catheter 2 and the guide catheter 1. At the same time, because the sealing ring 4 has a high elastic model, it can accommodate gaps of a certain range of sizes. When there is a certain deviation between the inner and outer diameters of the suction extension catheter 2 and the guide catheter 1, it still has good adaptability.

[0047] Both the suction extension catheter 2 and the guide catheter 1 adopt a multi-layer structure design. From the inside to the outside, it includes a flexible inner layer, a reinforcement layer and a flexible outer layer. Specifically, the flexible inner layer is made of polytetrafluoroethylene, the middle reinforcement layer is made of stainless steel or nickel titanium wire or other hard medical materials, and the flexible outer layer is made of polyurethane or polyether block polyamide or polyamide. This makes the tube body of the suction extension catheter 2 and the guide catheter 1 soft and has a certain radial support. The above-mentioned multi-layer structure is integrated by heating, so that the tube body has a very high internal and external surface quality and dimensional degree, ensuring good coordination and passability between the instruments, and at the same time will not cause damage to the blood vessels. The pull-out push rod 7 is made of nickel titanium or stainless steel, which is not easy to bend and has good pushing performance.

[0048] The tail of the suction extension catheter 2 has a suction bevel 6, which is connected to the inner cavity of the suction extension catheter 2. The suction bevel 6 can be used as a channel for the entry and exit of instruments, and can also be used as a channel for thrombus suction. External catheters or stents can enter the suction extension catheter 2 from the suction bevel 6 and move through it to the head end of the suction extension catheter 2 and be released at the designated lesion location.

[0049] In this embodiment, developing rings are provided at the head of the guide catheter 1 and the head of the suction extension catheter 2. The developing rings may be tantalum rings, platinum-iridium rings or other developing materials. The developing rings can be detected by X-rays. By displaying the real-time positions of the heads of the guide catheter 1 and the suction extension catheter 2 during surgery, the relative positions of the suction system and the target thrombus can be determined based on the positions of the developing rings.

[0050] The sealing ring 4 set on the outer surface of the suction extension catheter 2 can be made of polymer materials, metal materials or other materials, and the number of the sealing rings can be one or more. The sealing ring 4 is made by integrally forming the suction extension catheter 2 or by later superimposing, and finally a tight combination effect can be achieved.

[0051] The aspiration catheter assembly provided in this embodiment can block the gap between the aspiration extension catheter 2 and the guide catheter 1 through the occlusion ring 4, thereby achieving the function of aspirating thrombi at the lesion site. In addition, when the aspiration catheter assembly is in use, the delivery instrument and thrombus aspiration steps are combined into one, reducing instrument exchange, reducing complications, and improving surgical efficiency. In addition, the aspiration catheter assembly provided in this embodiment has a larger aspiration lumen than conventional thrombus aspiration catheters, and has better aspiration capabilities for large thrombi; compared to delivery catheters, it can be quickly exchanged via a guidewire, making operation more convenient. The aspiration catheter assembly provided in this embodiment can be used as a guide instrument to be inserted deeper into the blood vessel and achieve the function of aspirating thrombi and plaques, reducing thrombotic events caused by thrombus aspiration, reducing the exchange of instruments, and improving surgical efficiency. The aspiration catheter assembly provided in this embodiment uses the occlusion ring 4 to block the radial gap 10 reserved between the aspiration extension catheter 2 and the guide catheter 1, which is simpler and more convenient to operate than a occluding balloon, while also having higher aspiration efficiency.

[0052] As an alternative embodiment, Figures 4 to 8 As shown, the axial cross-section of the sealing ring 4 is an arc toward the side of the guide tube 1, that is, the cross-section of the sealing ring 4 is circular, semicircular or arched, and the sealing ring 4 is arranged in the middle of the suction extension catheter 2 or near one end of the suction bevel 6 or extends from the suction bevel 6 on the suction extension catheter 2.

[0053] As an alternative embodiment, a plurality of sealing rings 4 are provided at intervals along the length direction of the suction extension catheter 2 .

[0054] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A suction catheter assembly, characterized in that: include: Guide catheter (1); A suction extension catheter (2) is installed in the inner cavity of the guide catheter (1) along the length direction of the guide catheter (1), a radial gap (10) is reserved between the suction extension catheter (2) and the guide catheter (1), a sealing ring (4) is fixedly installed on the outer wall of the suction extension catheter (2), the sealing ring (4) is in sliding sealing cooperation with the inner wall of the guide catheter (1), and the sealing ring (4) is arranged away from the head of the suction extension catheter (2); A pulling push rod (7) is fixedly mounted on the tail of the suction extension catheter (2), and one end of the pulling push rod (7) facing away from the suction extension catheter (2) extends to the outside of the guide catheter (1).

2. The suction catheter assembly according to claim 1, wherein A plurality of sealing rings (4) are arranged at intervals along the length direction of the suction extension catheter (2).

3. The suction catheter assembly according to claim 1 or 2, characterized in that: The axial cross-section of the sealing ring (4) is an arc on the side facing the guide catheter (1).

4. The suction catheter assembly according to claim 1 or 2, characterized in that: The axial cross-section of the sealing ring (4) is an isosceles trapezoid.

5. The suction catheter assembly according to claim 1 or 2, characterized in that: A Y-shaped rotary connecting valve (9) is installed at the tail end of the guide catheter (1), and a connecting portion is provided at one end of the Y-shaped rotary connecting valve (9) away from the guide catheter (1), and the connecting portion is suitable for being fixed with an external tube catheter seat, and a side branch of the Y-shaped rotary connecting valve (9) is suitable for being connected to an external instrument.

6. The suction catheter assembly according to claim 1 or 2, characterized in that: A suction oblique opening (6) is provided at the opening of the tail of the suction extension conduit (2), and the pulling push rod (7) is fixedly connected to the longer side of the suction oblique opening (6).

7. The suction catheter assembly according to claim 1 or 2, characterized in that: The head of the guide catheter (1) and / or the suction extension catheter (2) is equipped with a developing component (3).

8. The suction catheter assembly according to claim 1 or 2, characterized in that: The guide catheter (1) and / or the suction extension catheter (2) comprises a flexible inner layer, a reinforcement layer and a flexible outer layer which are arranged in sequence from the inside to the outside, and the reinforcement layer is made of stainless steel or nickel titanium wire.

9. The aspiration catheter assembly according to claim 8, wherein: The flexible inner layer is made of polytetrafluoroethylene; and / or the flexible outer layer is made of polyurethane, polyamide or polyether block polyamide.

10. The suction catheter assembly according to claim 1 or 2, characterized in that: The sealing ring (4) and the suction extension catheter (2) are an integrally formed structure.

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