Suction catheter assembly

Abstract

The invention relates to the technical field of medical instruments, in particular to a suction catheter assembly which comprises a guide catheter and a suction 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 present invention relates to the technical field of medical devices, and 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 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] In order to eliminate the negative pressure damage caused by the gap between the catheters during surgery, the prior art adds a compliant balloon to the proximal end of the guide extension catheter body to achieve balloon occlusion of the gap between the guide extension catheter and the guide catheter, thereby achieving suction of the thrombus at the lesion site. However, in a limited gap space, adding a set of balloon filling cavity system will reduce the inner cavity size of the suction catheter, which will undoubtedly reduce the suction efficiency of the suction catheter. At this time, the filling capacity of the filling cavity will be greatly limited. At the same time, if it is necessary to ensure that the basic premise of each joint is strong enough, it will undoubtedly put forward high requirements on the manufacturing accuracy of the product. Moreover, due to the addition of the balloon inflation system, the number of operating steps in the surgical process will increase, prolonging the operation time. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the thrombus aspiration system composed of a guide extension catheter-guide catheter in the prior art, namely, high manufacturing precision and low operation 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 cavity of the guide catheter along the length direction of the guide catheter, a radial gap is 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, the sealing ring and the inner wall of the guide catheter are slidingly sealed, and the sealing ring is arranged away from the head of the suction extension catheter;

[0008] The pull-out push rod is fixedly mounted on the tail of the suction extension catheter, and one end of the pull-out push rod is away from 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 occluding 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 part is provided at one end of the Y-shaped rotary connecting valve away from the guide catheter, the connecting part is suitable for being fixed with the outer tube catheter seat, and the side branch of the Y-shaped rotary connecting valve is suitable for being connected to an external instrument.

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

[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 comprises a flexible inner layer, a reinforcement layer and a flexible outer layer which are sequentially arranged from the inside to the outside, and the reinforcement layer is made of stainless steel or nickel-titanium wire.

[0016] Optionally, the material of the flexible inner layer is polytetrafluoroethylene; and / or, the material of the flexible outer layer is 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 the present invention 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, a radial gap is 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, the sealing ring is slidingly sealed 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 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 the 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 sealing ring is set away from the head of the suction extension catheter, when the suction extension catheter enters the inside of the guide catheter by pushing the pull-out push rod, the sealing ring is located outside the guide catheter, ensuring that the suction extension catheter can move quickly inside the guide catheter. When the sealing ring enters the guide catheter, the sealing ring and the inner cavity of the guide catheter are slidably sealed, and the sealing ring can seal the radial gap between the guide catheter and the suction extension catheter. When the suction extension catheter continues to move into the inside of the guide catheter, it can slowly move forward under the friction between the sealing 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 manufacturing the aspiration catheter assembly, it is only necessary to set a sealing ring on the outside of the aspiration extension catheter without setting a complicated balloon matching structure. The manufacturing precision of the aspiration catheter assembly is low. Moreover, during operation, it is only necessary to push the pull-out push rod to install the aspiration extension catheter into place, which simplifies the operating steps of the aspiration catheter assembly, reduces the operating difficulty, and can greatly improve the operating efficiency when using the aspiration catheter assembly for thrombus aspiration.

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

[0022] 3. In the suction catheter assembly provided by the present invention, the axial cross section of the sealing ring is an arc on the side facing the guide catheter, so that the sealing ring is in line contact with the inner wall of the guide catheter, which reduces the friction between the sealing ring and the guide catheter while ensuring the sealing performance of the sealing ring on the radial gap, and improves the smoothness of the suction extension catheter after the sealing ring enters the guide catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

[0026] Figure 3 It is a schematic diagram of the structure of the suction extension catheter provided in an embodiment of the present invention.

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

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

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

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

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

[0032] Explanation of the reference numerals: 1. guide catheter; 2. suction extension catheter; 3. developing part; 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 technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 in 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 in the inner cavity of the guide catheter 1 along the length direction of the guide catheter 1, and a radial gap 10 is reserved between the suction extension catheter 2 and the guide catheter 1. A blocking ring 4 is fixedly installed on the outer wall of the suction extension catheter 2, and the blocking ring 4 is slidably sealed with the inner wall of the guide catheter 1. The blocking ring 4 is arranged away from the head of the suction extension catheter 2. In this embodiment, the blocking ring 4 and the suction extension catheter 2 are an integrally formed structure. In order to facilitate the molding of the blocking ring 4 on the suction extension catheter 2, the axial cross-section of the blocking ring 4 is a rectangle or an isosceles trapezoid.

[0039] The pull-out push rod 7 is fixedly arranged at the tail of the suction extension catheter 2, and the end of the pull-out push rod 7 away from the suction extension catheter 2 extends to the outside of the guide catheter 1. In order to facilitate the insertion of surgical instruments into the suction extension catheter 2, a suction oblique opening 6 is arranged at the tail of the suction extension catheter 2, and the pull-out push rod 7 is fixedly connected to the longer side of the suction oblique opening 6.

[0040] In order 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 rotating connection valve 9 is installed at the tail of the guide catheter 1. The end of the Y-shaped rotating connection valve 9 away from the guide catheter 1 is provided with an external thread as a connection part, and the connection part is suitable for being connected with the external tube catheter seat. The side branch of the Y-shaped rotating connection valve 9 is suitable for being connected with external devices. In order to facilitate the positioning of the guide catheter 1 in the patient's body, a developing part 3 is installed at the head of the guide catheter 1.

[0041] In the suction catheter assembly provided in this embodiment, the guide catheter 1 is used to establish a path to the target diseased blood vessel under the guidance of the guide wire, provide a stable platform for the deployment of subsequent instruments, and ensure non-invasiveness to surrounding blood vessels. The suction extension catheter 2 is combined with the guide catheter 1 to form a mother-and-child catheter for use, providing a stronger support for the system and facilitating the delivery and placement of interventional instruments. Because of its larger lumen size, it can generate stronger suction and thus can aspirate a larger volume of thrombus. The shaped rotary connection valve is suitable for sealingly connecting with the catheter seat 5 by threading, 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 is fixed to the catheter seat 5 by gluing or injection molding. The suction extension catheter 2 adopts an equal diameter or distal variable diameter design, and the suction extension catheter 2 is connected to the suction bevel 6, the suction bevel 6 and the pulling push rod 7 by welding, and the pulling handle 8 is fixed to the pulling push rod 7 by injection molding or other methods. In some other embodiments, the suction bevel 6 is directly formed at 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 instrument. In order to ensure that there is no loss of negative pressure during the thrombus aspiration process, a sealing ring 4 with an annular structure is arranged 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 between the sealing ring 4 and the inner wall of the guide catheter 1 during relative movement, 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 the suction catheter assembly is used to remove the thrombus, the suction extension catheter 2 is sent to the operating position of the diseased blood vessel through the guide catheter 1, and the local gap between the suction extension catheter 2 and the guide catheter 1 is blocked by the blocking ring 4. The suction extension catheter 2 can achieve rapid extraction of 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 the percutaneous coronary intervention treatment, the suction extension catheter 2 is used, and the blocking ring 4 is tightly matched with the inner wall of the guide catheter 1 to achieve the positioning of the guide catheter 1 and block the blood flow in the blood vessel.

[0045] The suction extension catheter 2 passes through the arm of the Y-shaped rotary connection valve 9 and is extended in the length direction through the guide catheter 1, so as to reach 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 connection 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 suction extension catheter 2, which is pressed against the inner wall of the elastic 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 higher 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 are designed with a multi-layer structure. From the inside to the outside, it includes a flexible inner layer, a reinforcement layer and a flexible outer layer. Specifically, the material of the flexible inner layer is polytetrafluoroethylene, the material of the middle reinforcement layer is stainless steel or nickel-titanium wire or other hard medical materials, and the material of the flexible outer layer is 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 inner and outer 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 is provided with 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. An external catheter or stent 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 may 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 the operation, the relative positions of the suction system and the target thrombus can be determined according to the positions of the developing rings.

[0050] The sealing ring 4 arranged 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 4 can be one or more. The sealing ring 4 is made by integrally forming the suction extension catheter 2 or by later stacking, and finally a tight combination effect can be achieved.

[0051] The suction catheter assembly provided in this embodiment can block the gap between the suction extension catheter 2 and the guide catheter 1 through the blocking ring 4, thereby realizing the suction function of the thrombus at the lesion site. In addition, when the suction catheter assembly is used, the delivery device and the thrombus suction step are combined into one, which reduces the exchange of devices, reduces complications, and improves the efficiency of the operation. In addition, compared with the general thrombus suction catheter, the suction catheter assembly provided in this embodiment has a larger suction cavity, which has better suction ability for large thrombi; compared with the delivery catheter, it can be quickly exchanged through the guide wire, and the operation is more convenient. The suction catheter assembly provided in this embodiment can be used as a guide instrument to be deeply inserted into a farther position of the blood vessel, and can also realize the function of thrombus and plaque suction, reduce thrombotic events caused by thrombus suction, reduce the exchange between instruments, and improve the efficiency of the operation. In the suction catheter assembly provided in this embodiment, the radial gap 10 reserved between the suction extension catheter 2 and the guide catheter 1 using the blocking ring 4 is simpler than the blocking balloon result, convenient to operate, and has a higher suction efficiency.

[0052] As an alternative implementation, 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 occluding rings 4 are arranged at intervals along the length direction of the suction extension catheter 2 .

[0054] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A suction catheter assembly, characterized in that: include: A 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) and the inner wall of the guide catheter (1) are slidably sealed, and the sealing ring (4) is arranged away from the head of the suction extension catheter (2); A pull-out push rod (7) is fixedly mounted on the tail of the suction extension catheter (2), and one end of the pull-out push rod (7) that is 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, characterized in that A plurality of the 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 rotating connecting valve (9) is installed at the tail end of the guide catheter (1); a connecting portion is provided at one end of the Y-shaped rotating connecting valve (9) away from the guide catheter (1); the connecting portion is suitable for being fixedly matched with an external tube catheter seat; and a side branch of the Y-shaped rotating 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 suction catheter assembly according to claim 8, characterized in that The material of the flexible inner layer is polytetrafluoroethylene; and / or the material of the flexible outer layer is 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.

Images