Intravascular thrombectomy device

Abstract

The present invention relates to the field of medical device technology, specifically an intravascular thrombectomy device comprising a sheath, an operating rod, and first and second dense nets disposed on the operating rod. The first and second dense nets are both elastic umbrella-shaped structures that can automatically expand in a natural state. The closed ends of the two dense nets are fixedly connected to the operating rod, and the open ends are arranged relative to each other, with a portion of the first dense net inserted within the second dense net. In the expanded state, the outer diameter of the second dense net is greater than the outer diameter of the first dense net, thereby forming an annular entrance at the point where the two overlap. The operating rod can move axially relative to the sheath, thereby pushing the first and second dense nets out of the sheath and automatically expanding or pulling them in and contracting them within the sheath. The intravascular thrombectomy device of this patent does not block blood flow during thrombus removal. Simply moving the operating rod relative to the sheath can achieve the expansion and contraction of the first and second dense nets, thereby collecting and encapsulating the thrombus, making it difficult for the thrombus to escape. The structural design is ingenious and the device is convenient and quick to use.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to an intravascular thrombus removal device. Background Art

[0002] Currently, the main treatments for thrombosis include drug thrombolysis and mechanical thrombectomy. However, drug thrombolysis has a long duration of effect and is less effective against large thrombi. Therefore, mechanical thrombectomy has been a hot topic of research in recent years. Currently, mechanical thrombectomy mainly includes the following methods: thrombus aspiration, capture thrombectomy, and laser thrombectomy. Among them, capture thrombectomy uses a thrombectomy balloon to contact the blood vessel wall to scrape the thrombus out of the body. During thrombectomy, the balloon blocks blood flow in the blood vessel, which has a significant impact on the human body. Therefore, thrombectomy filters have been developed, which do not block blood flow during thrombus removal. However, most current thrombectomy filters are thrombectomy filters, which have the problem of thrombus escape. There are also some thrombectomy devices that use thrombectomy filters to prevent or reduce thrombus escape, but they are complex in structure, inconvenient to use, and have high manufacturing and maintenance costs. Summary of the Invention

[0003] In order to overcome the defects in the prior art, the task of the present invention is to provide an intravascular thrombus removal device that will not block blood flow during thrombus removal, can effectively prevent thrombus escape, and has a simple and ingenious structure and is easy to use.

[0004] The task of the present invention is achieved through the following technical solutions:

[0005] An intravascular thrombus removal device includes a sheath, an operating rod passing through the sheath, a first dense mesh and a second dense mesh axially arranged on the operating rod, the operating rod is provided with a middle hole along its axial direction for a guide wire to pass through, the first dense mesh and the second dense mesh are both elastic umbrella-shaped structures that can automatically expand under natural conditions, the closed ends of the first dense mesh and the second dense mesh are fixedly connected to the operating rod, the open ends are arranged opposite to each other and part of the first dense mesh is inserted into the second dense mesh so as to cooperate to form a filter cover, the first dense mesh is located at the distal end of the second dense mesh, and in the expanded state, the outer diameter of the second dense mesh is greater than the outer diameter of the first dense mesh so that an annular entrance connected to the inside of the filter cover is formed at the overlapping part of the second dense mesh and the first dense mesh, the operating rod can move axially relative to the sheath, so that the first dense mesh and the second dense mesh can be pushed out of the sheath and automatically expanded or pulled in and contracted into the sheath.

[0006] As a preferred technical solution, the first dense mesh and the second dense mesh are both umbrella-shaped structures composed of a conical section and a straight section connected in series, the closed end is located at the top of the conical section, and the open end is located at the free end of the straight section. The conical section and the straight section are integrally formed or fixedly connected, and the filter plug cover formed by the second dense mesh and the first dense mesh in the expanded state is a capsule-shaped structure.

[0007] As a preferred technical solution, the first dense mesh and / or the second dense mesh are made of an elastic metal mesh, or are made of elastic metal ribs and a mesh cover on the outside.

[0008] As a preferred technical solution, the intravascular thrombus removal device further includes a guide wire, which passes through the middle hole of the operating rod.

[0009] When in use, first retract the first dense net and the second dense net on the joystick into the sheath, then guide the sheath and the joystick inside it to the designated position in the blood vessel through the guide wire, and then push the joystick toward the distal end relative to the sheath, thereby driving the first dense net and the second dense net to be pushed out of the sheath in sequence. After the first dense net and the second dense net are freed from the restraint of the sheath, they will naturally unfold and cooperate to form a filter cover (the outer diameters of the first dense net and the second dense net after unfolding are smaller than the inner diameter of the blood vessel, so they will not scratch the inner wall of the blood vessel). When blood flows through, it will enter the two dense nets through the annular entrance at the overlapping part of the first dense net and the second dense net. When a thrombus needs to be removed, the joystick is dragged relative to the sheath toward the proximal end. The closed end of the second dense net first abuts the sheath and contracts under the pressure of the sheath. Since the open end of the second dense net is sleeved on the outside of the open end of the first dense net, it will squeeze the first dense net inward and drive the first dense net to contract at the same time, so that both the second dense net and the first dense net contract and cooperate to wrap the thrombus inside and are dragged into the sheath in sequence. Then the sheath and the joystick inside are removed to achieve the removal of the thrombus. The above method can be repeated many times to achieve the purpose of clearing the thrombus. The intravascular thrombus removal device of the present invention is commonly used for intravenous thrombus removal, but can also be used for intraarterial thrombus removal.

[0010] Compared with the prior art, the intravascular thrombus removal device of the present invention removes thrombi through the first dense net and the second dense net, and blood flow can pass through the dense net, so the blood flow will not be blocked during thrombus removal. The first dense net and the second dense net cooperate to form a filter cover, and thrombi entering therein are difficult to escape. The elastic automatic expansion characteristics of the first dense net and the second dense net and the position of the first dense net inserted into the second dense net are utilized, so that the first dense net and the second dense net can be expanded and contracted by moving the joystick relative to the sheath, thereby realizing the collection and wrapping of thrombi. The structure is simple, the design is ingenious, the use is convenient and quick, and the thrombus removal effect is good. By designing the first dense net and the second dense net as an umbrella-shaped structure composed of a conical section and a straight section in series, the filter cover formed by the second dense net and the first dense net in the expanded state is a capsule-shaped structure, which can increase the volume of the filter cover, and the capsule-shaped structure is smoother and less likely to scratch the inner wall of the blood vessel.

[0011] The concept, specific structure and effects of the present invention will be further described below with reference to the accompanying drawings to fully understand the purpose, features and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the intravascular thrombus removal device of the present invention;

[0013] Figure 2 It is a schematic cross-sectional view of the intravascular thrombus removal device of the present invention.

[0014] Among them, there are a sheath 1, a joystick 2, a guide wire 3, a first dense mesh 4, a tapered section 41, a straight section 42, a second dense mesh 5, and an annular inlet 6. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] It should be noted that when an element is referred to as being “connected to” another element, it may be directly connected to the other element or be indirectly connected to the other element via an intervening element.

[0017] like Figure 1-2 As shown, an intravascular thrombus removal device includes a sheath 1, an operating rod 2 passing through the sheath 1, a guide wire 3 passing through the hole in the operating rod 2, and a first dense mesh 4 and a second dense mesh 5 axially arranged on the operating rod 2. The first dense mesh 4 and the second dense mesh 5 are both elastic umbrella-shaped structures that can automatically expand in a natural state. The closed ends of the first dense mesh 4 and the second dense mesh 5 are fixedly connected to the operating rod 2, and the open ends are both sleeved outside the sheath 1 and arranged opposite to each other, and the open end of the first dense mesh 4 is partially inserted into the open end of the second dense mesh 5, so as to cooperate to form a filter cover. The first dense mesh 4 is located at the distal end of the second dense mesh 5, and the second dense mesh 5 is partially sleeved outside the first dense mesh 4. In the expanded state, the outer diameter of the second dense mesh 5 is larger than the outer diameter of the first dense mesh 4, so that an annular inlet 6 connected to the interior of the filter cover is formed at the overlapping part of the second dense mesh 5 and the first dense mesh 4. The operating rod 2 can move axially relative to the sheath 1, so that the first dense mesh 4 and the second dense mesh 5 can be pushed out of the sheath 1 and automatically expanded or pulled in and retracted into the sheath 1.

[0018] In this embodiment, both the first dense mesh 4 and the second dense mesh 5 are umbrella-shaped structures composed of a tapered section 41 and a straight section 42 connected in series. The closed end is located at the top of the tapered section 41, and the open end is located at the free end of the straight section 42. The tapered section 41 and the straight section 42 are integrally formed. In the expanded state, the second dense mesh 5 cooperates with the first dense mesh 4 to form the filter cover in a capsule-like structure. In other embodiments, the first dense mesh 4 and / or the second dense mesh 5 may also adopt other structures.

[0019] In this embodiment, the first dense mesh 4 and the second dense mesh 5 are made of elastic metal mesh. In other embodiments, the first dense mesh 4 and the second dense mesh 5 can also be made of elastic metal ribs and a mesh cover on the outside.

[0020] In addition, in other embodiments, the intravascular thrombectomy device may not have its own guidewire 3 and may share the guidewire of other interventional treatment devices.

[0021] During use, the first dense mesh 4 and the second dense mesh 5 on the joystick 2 are first retracted into the sheath 1, and then the sheath 1 and the joystick 2 therein are sent to the designated position in the blood vessel by means of the guide wire 3. Then, by pushing the joystick 2 toward the distal end relative to the sheath 1, the first dense mesh 4 and the second dense mesh 5 are driven out of the sheath 1 in sequence. After the first dense mesh 4 and the second dense mesh 5 are freed from the restraint of the sheath 1, they will naturally unfold and cooperate to form a filter cover (the outer diameters of the unfolded first dense mesh 4 and the second dense mesh 5 are smaller than the inner diameter of the blood vessel, so they will not scratch the inner wall of the blood vessel). When blood flows through, it will pass through the annular entrance at the overlapping position of the first dense mesh 4 and the second dense mesh 5 6 enters the interior of the two dense nets (i.e., the filter cover). When it is necessary to remove the thrombus, by dragging the joystick 2 relative to the sheath 1 toward the proximal end, the closed end of the second dense net 5 first abuts the sheath 1 and contracts under the pressure of the sheath 1. Since the open end of the second dense net 5 is sleeved on the outside of the open end of the first dense net 4, it will squeeze the first dense net 4 inward and drive the first dense net 4 to contract at the same time, so that the second dense net 5 and the first dense net 4 both contract and cooperate to wrap the thrombus inside them and are dragged into the sheath 1 in sequence. Then, the sheath 1 and the joystick 2 inside are removed, thereby achieving the removal of the thrombus. Using the above method, the operation can be repeated many times to achieve the purpose of clearing the thrombus. The intravascular thrombus removal device of the present invention is commonly used for intravenous thrombus removal, but can also be used for intraarterial thrombus removal.

[0022] The thrombus can be collected and wrapped by the first and second dense nets 4 and 5 by moving the joystick 2 relative to the sheath 1. The device has a simple structure, an ingenious design, is quick and easy to use, and has a good thrombus removal effect. The first and second dense nets 4 and 5 are designed as an umbrella-shaped structure composed of a tapered section 41 and a straight section 42 connected in series, so that the filter cover formed by the second dense net 5 and the first dense net 4 in the expanded state is a capsule-shaped structure, which can increase the volume of the filter cover, and the capsule-shaped structure is smoother and less likely to scratch the inner wall of the blood vessel.

[0023] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An intravascular thrombus removal device, characterized in that: The invention comprises a sheath, a joystick passing through the sheath, a first dense mesh and a second dense mesh axially arranged on the joystick, the joystick being provided with a middle hole along its axial direction for the guide wire to pass through, the first dense mesh and the second dense mesh being elastic umbrella-shaped structures that can be automatically expanded in a natural state, the closed ends of the first dense mesh and the second dense mesh being fixedly connected to the joystick, the open ends being arranged opposite to each other and a portion of the first dense mesh being inserted into the second dense mesh so as to cooperate to form a filter cover, the first dense mesh being located at the distal end of the second dense mesh, the outer diameter of the second dense mesh being larger than the outer diameter of the first dense mesh in the expanded state so that an annular inlet communicating with the interior of the filter cover is formed at the overlap of the second dense mesh and the first dense mesh, the joystick being able to move axially relative to the sheath, thereby being able to push the first dense mesh and the second dense mesh out of the sheath so as to automatically expand or to pull them into and contract them within the sheath; When the joystick is dragged toward the proximal end relative to the sheath, the closed end of the second dense mesh first abuts the sheath and contracts under the pressure of the sheath. Since the open end of the second dense mesh is sleeved on the outside of the open end of the first dense mesh, it will squeeze the first dense mesh inward and drive the first dense mesh to contract, so that the second dense mesh and the first dense mesh are both contracted and dragged into the sheath in sequence; the first dense mesh and / or the second dense mesh are made of elastic metal mesh, or are made of elastic metal ribs and a mesh cover on the outside; the intravascular thrombus removal device also includes a guide wire, which passes through the middle hole of the joystick.

2. The intravascular thrombus removal device according to claim 1, characterized in that: The first dense mesh and the second dense mesh are both umbrella-shaped structures composed of a conical section and a straight section connected in series, the closed end is located at the top of the conical section, and the open end is located at the free end of the straight section. The conical section and the straight section are integrally formed or fixedly connected. In the expanded state, the filter plug cover formed by the second dense mesh and the first dense mesh is a capsule-shaped structure.

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