An aspiration catheter

Abstract

The application discloses a kind of suction catheter, including outer layer catheter, inner layer catheter, the inner layer catheter includes catheter main body, with the self-expandable distal end of distal end being connected and can be received into the outer layer catheter, hollow lumen is equipped in the catheter main body, the proximal end of the outer layer catheter is equipped with the first valve body being connected with it, the catheter main body passes through in the first valve body, the lateral interface being communicated with its interior is equipped in the side of the first valve body, the catheter main body side wall is equipped with the catheter gap corresponding with the lateral interface, the cooperation of the self-expandable distal end and catheter main body can be self-expandable, the self-expandable distal end can be consistent with the inner wall of blood vessel, can be used to capture free thrombus, avoid thrombus to escape into blood vessel and cause risk in the process of suction, directly through the catheter main body in the outer layer catheter suction, can effectively utilize the internal space of outer layer catheter, maximum effective suction diameter, maximum suction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thrombus treatment devices, in particular the technical field of suction catheter suction structures. BACKGROUND

[0002] Physiological hemostasis is composed of three steps of blood vessel contraction, platelet thrombus formation and blood coagulation, and is the result of the interaction of factors such as platelets, coagulation factors and anticoagulation factors. When its function is disordered, abnormal coagulation will occur in the blood vessels to form thrombus emboli, which will eventually develop into embolized blood vessels, causing a series of cardiovascular diseases including myocardial infarction, cerebral embolism, pulmonary thrombus, deep vein thrombosis, etc.

[0003] There are several methods for removing intravascular thrombus. One is to dissolve the thrombus by perfusion of drugs. Two is to use a thrombectomy stent to pull out the intravascular thrombus, with or without balloon-assisted vessel expansion. Another is to use a suction catheter to manually or automatically extract the thrombus and recover it into the catheter.

[0004] In the process of using a suction catheter to remove thrombus, large thrombus is easily cut and broken by the edge of the suction catheter to form small thrombus, which is easy to escape to the distal end and block the remaining blood vessel branches. In addition, in order to pass through the tortuous blood vessels to reach the designated position, the diameter of the suction catheter is relatively small compared to the blood vessels. In the face of strong adhesive thrombus, the suction catheter cannot provide greater suction force. SUMMARY

[0005] The purpose of the present application is to solve the problems in the prior art and provide a suction catheter that can improve suction quality, avoid thrombus escape, increase the diameter of the suction catheter, and provide greater suction force.

[0006] To achieve the above-mentioned purpose, the present application provides a suction catheter, which comprises an outer catheter, an inner catheter axially slidable in the inner part of the outer catheter, the inner catheter comprising a catheter main body, a self-expandable distal end connected to the distal end of the catheter main body and capable of being accommodated in the outer catheter, a hollow lumen being provided in the catheter main body, a first valve body being provided at the proximal end of the outer catheter and connected thereto, the catheter main body passing through the first valve body, a lateral interface being provided on the side of the first valve body and communicating with the inside thereof, a catheter notch being provided on the side wall of the catheter main body and corresponding to the lateral interface, the catheter notch being provided along the length direction of the catheter main body, and a limiting device being provided in the first valve body and cooperating with the catheter main body to keep the catheter notch in communication with the lateral interface at all times during the pushing, retracting and thrombectomy processes.

[0007] As preferred, the limiting device is a pin body arranged at the lateral interface, the first valve body is provided with a limiting hole matched with the pin body near the lateral interface, the pin body is inserted into the limiting hole and extends into the first valve body to cooperate with the catheter notch, and the pin body cooperates with the catheter notch to keep the catheter notch in communication with the lateral interface during pushing, retracting and taking out of the plug.

[0008] As preferred, the limiting device is a limiting block arranged in the first valve body, the limiting block is arranged on the inner wall of the first valve body near the lateral interface, and the limiting block extends into the catheter notch and is slidably connected with the catheter notch.

[0009] As preferred, a core rod matched with the inner cavity of the catheter body is further arranged, and the core rod is used for plugging the catheter notch.

[0010] As preferred, the proximal end of the catheter body is provided with a connector connected therewith.

[0011] As preferred, the proximal end of the connector is provided with a second valve body in communication therewith, and the second valve body is used for controlling sealing and opening of the proximal end of the catheter body.

[0012] As preferred, the outer diameter of the catheter body is 1-4 mm.

[0013] As preferred, the width of the catheter notch on both sides is 1-4 mm, and the length is 20-60 mm.

[0014] The suction catheter has the advantages that: the self-expandable distal end can be attached to the inner wall of a blood vessel through cooperation with the catheter body, can be used for capturing a free thrombus, avoids that the thrombus escapes into the blood vessel during the suction process to cause risks, improves the suction quality and the safety of the suction process, is suitable for taking out thrombus of various sizes, directly sucks through the catheter body in the outer catheter, can effectively utilize the internal space of the outer catheter, maximizes the effective suction diameter, and maximizes the suction efficiency.

[0015] The features and advantages of the present application will be described in detail through embodiments combined with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a front view structural schematic diagram of the suction catheter.

[0017] Figure 2 is a left view structural schematic diagram of the suction catheter.

[0018] Figure 3 is a right view structural schematic diagram of the suction catheter.

[0019] Figure 4 Figure 1 is a structural schematic diagram of a core rod of a suction catheter extending into an inner catheter.

[0020] Figure 5 Figure 2 is a structural schematic diagram of a core rod of a suction catheter extending into an inner catheter. Figure 1 Figure 3 is a partially enlarged structural schematic diagram.

[0021] Figure 6 Figure 4 is a structural schematic diagram of a suction catheter being emptied.

[0022] Figure 7 Figure 5 is a structural schematic diagram of a suction catheter being suctioned.

[0023] In the figure: 1 - outer catheter, 2 - inner catheter, 3 - second valve body, 4 - joint, 5 - first valve body, 6 - limiting device, 7 - core rod, 201 - self-expandable distal end, 202 - catheter body, 204 - catheter gap, 501 - lateral interface. Embodiment

[0024] In order to make the objects, technical solutions and advantages of the present application clearer and more comprehensible, the present application will be further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0025] In the description of the present application, it should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] In the description of the application, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0027] In the description of the application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. Embodiments

[0028] Reference Figures 1-7The application discloses a suction catheter, which comprises an outer catheter 1, an inner catheter 2 axially slidably arranged in the inner part of the outer catheter 1, the inner catheter 2 comprising a catheter main body 202 and a self-expandable distal end 201 connected with the distal end of the catheter main body 202 and capable of being accommodated in the outer catheter 1, a catheter notch 204 being cut on a hollow pipe with an outer diameter of 3 mm, the two ends of the catheter notch 204 being in arc shape, the edge being chamfered, the notch width being 3 mm and the length being 30 mm, serving as the catheter main body 202; a hollow inner cavity is arranged in the catheter main body 202, a first valve body 5 is arranged at the proximal end of the outer catheter 1 and connected with the outer catheter 1, the catheter main body 202 passes through the first valve body 5, a lateral interface 501 in communication with the inner part of the first valve body 5 is arranged at the side of the first valve body 5, the catheter notch 204 corresponding to the lateral interface 501 is arranged on the side wall of the catheter main body 202, the catheter notch 204 is arranged along the length direction of the catheter main body 202, and a limiting device 6 is arranged in the first valve body 5 and matched with the catheter main body 202 so that the catheter notch 204 always keeps in communication with the lateral interface 501 during the pushing, retracting and thrombus removing processes. When the catheter works, in the conveying state, the self-expandable distal end 201 is wholly or partially accommodated in the outer catheter 1, and the self-expandable distal end 201 is in the pressed state. In the thrombus removing state, the outer catheter 1 is retracted, the self-expandable distal end 201 is released into the blood vessel and expanded to tightly adhere to the inner wall of the blood vessel or to the corresponding specification diameter, manual or automatic suction is carried out from the lateral interface 501 of the first valve body 5, the blood flow can be reversed, the thrombus enters the catheter main body 202 through the self-expandable distal end 201 of the catheter, and then is sucked out of the body through the catheter notch 204 and the lateral interface 501, so that the thrombus is removed. In the embodiment, the self-expandable distal end 201 is matched with the catheter main body 202, the self-expandable distal end 201 can adhere to the inner wall of the blood vessel, can be used for capturing the free thrombus, can avoid the thrombus from escaping into the blood vessel in the suction process to cause the risk, can directly carry out suction through the catheter main body 202 in the outer catheter 1, can effectively utilize the inner space of the outer catheter 1, and can maximize the effective suction diameter and the suction efficiency.

[0029] Preferably, the self-expandable distal end 201 is connected with the catheter main body 202 in a mode of adhesion, welding, hot melting or mechanical connection. The self-expandable distal end 201 is in a trumpet shape in the natural state, can adhere to the inner wall of the blood vessel under different conditions, can enlarge the thrombus removing area, and can prevent the thrombus from being cut, broken and escaped.

[0030] Preferably, the limiting device 6 is a pin body provided at the lateral interface 501, which cooperates with the catheter gap 204 to keep the catheter gap 204 in communication with the lateral interface 501 during pushing, retracting and stent retrieval. The first valve body 5 is provided with a limiting hole adapted to the pin body, which is punched 5 mm behind the position where the lateral interface 501 communicates with the main lumen of the first valve body 5, penetrates through both sides of the first valve body 5, has a diameter of 1 mm, and is filled with a pin body having a diameter of 1 mm and a length of 3 mm, which is engaged with the catheter gap 204, and then the limiting holes on both sides of the outer surface of the first valve body 5 are sealed with glue. After the pin body is inserted into the limiting hole, it protrudes into the inner wall of the outer catheter 1 and can be engaged with the catheter gap 204 to limit the circumferential rotation of the catheter body 202 and define the axial sliding position of the catheter body 202, ensuring that the lateral interface 501 of the first valve body 5 can always keep unobstructed during the pushing, retracting and stent retrieval of the inner catheter 2.

[0031] Referring to Figure 4 , it also includes a core rod 7 adapted to the inner cavity of the catheter body 202, which is used to block the catheter gap 204. When emptying, the core rod 7 is inserted to fill the inner cavity of the catheter body 202, so that the catheter gap 204 is completely blocked and the first valve body 5 is locked, and then physiological saline is injected from the lateral interface 501, so that the physiological saline can be injected into the gap between the outer catheter 1 and the inner catheter 2, achieving emptying of the gap between the outer catheter 1 and the inner catheter 2, avoiding air entering the blood vessel with the structure, and improving the safety of the operation.

[0032] Referring to Figure 1 , Figure 2 , Figure 3 , the proximal end of the catheter body 202 is provided with a connector 4 connected thereto. The connector 4 is used to connect with the remaining facilities and facilitate the disassembly and replacement of the remaining facilities. On the other hand, the connector 4 is also used to control the extension and retraction of the inner catheter 2, and the inner catheter 2 is controlled by holding the connector 4.

[0033] Referring to Figure 1 , Figure 2 , Figure 3 , the proximal end of the connector 4 is provided with a second valve body 3 in communication therewith, which is used to control the sealing and opening of the proximal end of the catheter body 202. During stent retrieval, the proximal end of the catheter body 202 can be closed through the second valve body 3. Embodiment

[0034] Referring to Figure 1 , Figure 2 , Figure 3The embodiment provides another kind of suction catheter, comprising outer catheter 1, inner catheter 2 axially slidably arranged inside the outer catheter 1, the inner catheter 2 comprising catheter main body 202, self-expandable distal end 201 connected with the distal end of the catheter main body 202 and can be accommodated in the outer catheter 1, catheter notch 204 is cut on the hollow pipe with an outer diameter of 3mm, the both ends of the catheter notch 204 are arc-shaped, the edge is chamfered, the notch slot width is 2.5mm, and the length is 50mm, serving as the catheter main body 202;The catheter main body 202 is provided with a hollow lumen, the proximal end of the outer catheter 1 is provided with a first valve body 5 connected therewith, the catheter main body 202 passes through the first valve body 5, the side of the first valve body 5 is provided with a lateral interface 501 in communication with the inside thereof, the side wall of the catheter main body 202 is provided with a catheter notch 204 corresponding to the lateral interface 501, the catheter notch 204 is arranged along the length direction of the catheter main body 202, and the first valve body 5 is provided with a limiting device 6 matched with the catheter main body 202 to keep the catheter notch 204 in communication with the lateral interface 501 during pushing, retracting and taking out the plug process.

[0035] Preferably, the limiting device 6 is a limiting block arranged in the first valve body 5, the limiting block is arranged on the inner wall of the first valve body 5 close to the lateral interface 501, and the limiting block partially extends into the catheter notch 204 and is slidably connected with the catheter notch 204. An arc-shaped limiting block with a width of 2.5mm, a length of 5mm and a thickness of 0.1mm is fixed on the inner surface of the first valve body 5 at a position 5mm behind the position where the lateral interface 501 is in communication with the main lumen of the first valve body 5 by using glue, so that the limiting block can be matched with the catheter notch 204 to realize limiting. Compared with the limiting device 6 in the first embodiment, the structure of the limiting device 6 in the embodiment is more stable, the connection between the limiting device 6 and the catheter notch 204 is more firm, the limiting device 6 is not easy to be separated, the quality is better, and the safety type is better.

[0036] The working process of the suction catheter is as follows:

[0037] In the working process of the suction catheter, the catheter is first emptied before taking out the plug, when the emptying operation is performed, the mandrel 7 is inserted, the catheter notch 204 on the catheter main body 202 is completely blocked, the second valve body 3 and the first valve body 5 are locked, and physiological saline is injected from the lateral interface 501 to realize the emptying of the gap between the catheter 1 and the catheter 2.

[0038] In the delivery state, the self-expandable distal end 201 is fully or partially accommodated in the outer catheter 1, and the self-expandable distal end 201 is in a pressed state.

[0039] In the plug state, the outer catheter 1 is retracted, and the self-expandable distal end 201 is released into the blood vessel and expands to tightly adhere to the inner wall of the blood vessel or the corresponding standard diameter. From the side interface 501 of the first valve body 5, manual or automatic suction can be performed to reverse the blood flow, and the thrombus enters the catheter body 202 through the self-expandable distal end 201 of the catheter, and then is extracted out of the body through the catheter gap 204 and the side interface 501, thereby achieving the removal of the thrombus.

[0040] After confirming that the thrombus is completely removed, the inner catheter 2 is retracted to the initial position, and the self-expandable distal end 201 of the catheter is bundled into the inner cavity of the outer catheter 1. The outer catheter 1 and the inner catheter 2 are retracted together as a whole, thereby recovering the suction catheter with the thrombus.

[0041] The standard parts used in the present application file can be purchased from the market, and the specific connection mode of each part adopts the conventional means such as bolts, rivets, welding, etc. in the prior art. The internal components of the electric sliding rail sliding seat, the cylinder, the welding machine, the electric telescopic rod and the controller are of conventional types in the prior art, and their internal structures belong to the prior art structure. Workers can complete normal operation according to the existing technical manual, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0042] It should be noted that although the above embodiments have been described in this paper, the patent protection scope of the present application is not limited thereby. Therefore, based on the innovative idea of the present application, changes and modifications to the embodiments described herein, or equivalent structures or equivalent process transformations made using the contents of the present application specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the present application patent.

Claims

1. An aspiration catheter comprising an outer catheter (1), an inner catheter (2) axially slidable inside the outer catheter (1), characterized in that: The inner layer catheter (2) comprises a catheter main body (202), a self-expandable distal end (201) connected to the distal end of the catheter main body (202) and capable of being accommodated in the outer layer catheter (1), a hollow lumen is arranged in the catheter main body (202), a first valve body (5) is arranged at the proximal end of the outer layer catheter (1), the catheter main body (202) passes through the first valve body (5), a lateral interface (501) is arranged on the side of the first valve body (5) and communicates with the inside of the first valve body (5), a catheter notch (204) corresponding to the lateral interface (501) is arranged on the side wall of the catheter main body (202), the catheter notch (204) is arranged along the length direction of the catheter main body (202), a limiting device (6) is arranged in the first valve body (5) and cooperates with the catheter notch (204) to keep the catheter notch (204) in communication with the lateral interface (501) during pushing, retracting and taking out the plug; in the delivery state, the self-expandable distal end (201) is fully or partially accommodated in the outer layer catheter (1), and the self-expandable distal end (201) is in a pressed state; in the plug taking-out state, the outer layer catheter (1) is retracted, the self-expandable distal end (201) is released into the blood vessel and expands to tightly adhere to the inner wall of the blood vessel or to the corresponding specification diameter.

2. A suction catheter as in claim 1, wherein: The limiting device (6) is a pin arranged at the lateral interface (501), a limiting hole adapted to the pin is arranged on the first valve body (5) near the lateral interface (501), the pin is inserted into the limiting hole and extends into the first valve body (5) to cooperate with the catheter notch (204), and the pin and the catheter notch (204) cooperate to keep the catheter notch (204) in communication with the lateral interface (501) during pushing, retracting and taking out the plug.

3. A suction catheter as in claim 1, wherein: The limiting device (6) is a limiting block arranged in the first valve body (5), the limiting block is arranged on the inner wall of the first valve body (5) near the lateral interface (501), and the limiting block partially extends into the catheter notch (204) and is slidably connected with the catheter notch (204).

4. A suction catheter as in claim 1, wherein: A core rod (7) adapted to the lumen of the catheter main body (202) is further arranged, and the core rod (7) is used for plugging the catheter notch (204).

5. A suction catheter as in claim 1, wherein: A connector (4) is arranged at the proximal end of the catheter main body (202).

6. A suction catheter as in claim 5, wherein: A second valve body (3) is arranged at the proximal end of the connector (4) and communicates with the connector (4), and the second valve body (3) is used for controlling the sealing and opening of the proximal end of the catheter main body (202).

7. A suction catheter as in claim 1, wherein: The outer diameter of the catheter main body (202) is 1-4 mm.

8. A suction catheter as in claim 1, wherein: The width of the catheter notch (204) on both sides is 1-4 mm, and the length is 20-60 mm.

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