Thrombus removing device

Abstract

The utility model relates to the technical field of mechanical thrombus extraction devices, in particular to a thrombus removing device which comprises a conveying catheter, a guiding piece and a thrombus extraction piece, the guiding piece extends along an inner cavity of the conveying catheter, and the guiding piece extends out of the conveying catheter from the head of the conveying catheter; one end of the thrombus taking piece is fixedly connected with the head of the conveying catheter, the other end of the thrombus taking piece is fixedly connected with the guiding piece, and the thrombus taking piece has an expansion state when external stress applied by the guiding piece and / or the conveying catheter is applied and a contraction state when no external stress exists. According to the thrombus removing device, the thrombus taking piece is designed to be of the structure capable of being axially stretched or axially compressed, so that a conveying catheter does not need to be arranged when the thrombus removing device is used, the thrombus taking structure in the stretched state is small in outer diameter, and a small-size catheter can be used for conveying. The shuttling difficulty of the thrombus removing device in the blood vessel can be greatly reduced, and the use safety of the thrombus removing device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical take bolt device technical field, concretely relates to a thrombus removing device. BACKGROUND

[0002] With the continuous progress of thrombus removing technology, mechanical thrombectomy technology has been widely used in clinical practice due to its short operation time, small blood vessel damage, rapid recovery and low recurrence rate. Mechanical thrombectomy has various modes, including capture thrombectomy, aspiration thrombectomy and rotational thrombectomy.

[0003] In the prior art, the net disc or stent for mechanical thrombectomy is made of shape memory alloy. This material has the characteristics of spontaneous expansion in the unconstrained state, so it is difficult to pass through the thrombus directly. Therefore, it is necessary to shrink these devices in the delivery catheter before thrombectomy in order to smoothly pass through the thrombus. However, this way needs to add a delivery catheter component, which increases the complexity of operation. Moreover, for large size thrombectomy net disc or stent, a delivery catheter with large outer diameter is usually needed. This not only increases the difficulty of the device passing through the thrombus, but also may cause the risk of rupturing the thrombus. SUMMARY

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the large outer diameter of the mechanical thrombectomy device in the prior art makes it difficult for the device to pass through the thrombus, so as to provide a thrombus removing device.

[0005] In order to solve the above technical problems, the utility model provides a thrombus removing device, which comprises:

[0006] a delivery catheter;

[0007] a guide extending along the inner cavity of the delivery catheter, and the guide extends from the head of the delivery catheter to the outside of the delivery catheter;

[0008] a thrombectomy element, one end of which is fixedly connected with the head of the delivery catheter, and the other end is fixedly connected with the guide, the thrombectomy element having an expanded state when subjected to external stress applied by the guide and / or the delivery catheter, and a contracted state when there is no external stress.

[0009] Optionally, the head of the thrombectomy element is fixedly connected with a guide element, and the guide element is fixedly connected with the guide.

[0010] Optionally, the front end of the guide element is provided with an arc-shaped part.

[0011] Optionally, the tail of the delivery catheter is provided with an operating handle, and the guide is detachably connected with the operating handle.

[0012] Optionally, the operation handle comprises a push-pull assembly and a control handle, one end of the push-pull assembly is in sliding connection with the control handle, and the other end is in fixed connection with the delivery catheter, and the guide member is detachably connected to the control handle.

[0013] Optionally, the control handle comprises a handle body and a fixed lock buckle mounted on the handle body, and the guide member is mounted in cooperation with the fixed lock buckle.

[0014] Optionally, the push-pull assembly comprises a sliding rod in sliding cooperation with the control handle and a push-pull part mounted on the sliding rod, and the push-pull part extends outward around the circumference of the sliding rod.

[0015] Optionally, a locking member is mounted at one end of the sliding rod away from the control handle, and the delivery catheter is detachably connected with the locking member.

[0016] Optionally, a strain release sleeve is mounted at one end of the delivery catheter in cooperation with the operation handle, and the strain release sleeve is fixedly sleeved on the delivery catheter.

[0017] Optionally, a fixing ring is arranged at one end of the delivery catheter connected with the thrombus taking member, and the thrombus taking member is connected in cooperation with the fixing ring.

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

[0019] 1. The thrombus removing device comprises a delivery catheter, a guide member and a thrombus taking member, the guide member extends along the inner cavity of the delivery catheter, and the guide member extends out of the delivery catheter from the head of the delivery catheter; one end of the thrombus taking member is fixedly connected with the head of the delivery catheter, and the other end is fixedly connected with the guide member, and the thrombus taking member has an expanded state when subjected to external stress applied by the guide member and / or the delivery catheter and a contracted state when there is no external stress.

[0020] When the thrombus inside the blood vessel is removed by using the thrombus removing device, the delivery catheter and the thrombus taking member are driven by the guide member to advance to the thrombus position, the relative displacement between the delivery catheter and the guide member is generated by pulling back the guide member or pushing forward the delivery catheter, the thrombus taking member is expanded outward under the extrusion of the guide member and the delivery catheter, so as to scrape and collect the thrombus. After the thrombus is removed, the guide member or the delivery catheter is reset, so as to cancel the external stress applied to the thrombus taking member, and the thrombus taking member can recover to the contracted state and then be withdrawn from the blood vessel. By designing the thrombus taking member as an axially stretchable or compressible structure, the thrombus removing device does not need to be provided with a delivery catheter when used, and the outer diameter of the thrombus taking member in the stretched state is small, so that a small size catheter can be used for delivery. The difficulty of the thrombus removing device in the blood vessel can be greatly reduced, and the safety of the thrombus removing device in use can be improved.

[0021] 2. The thrombus removing device, the thrombus removing device is provided with a guide piece fixedly connected to the head of the thrombus removing device, and the guide piece is fixedly connected to the guide piece, the guide piece is arranged to guide the movement of the thrombus removing device in the blood vessel, and the thrombus removing device is convenient to advance in the curved position in the blood vessel.

[0022] 3. The thrombus removing device, the control handle comprises a handle body and a fixed lock buckle mounted on the handle body, and the guide piece is mounted in cooperation with the fixed lock buckle. When the thrombus removing device is installed in place and external force is applied thereto, the guide piece is locked in cooperation with the fixed lock buckle to position the guide piece, the thrombus removing device is expanded by pushing the delivery catheter, and the thrombus removing device is convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0024] Figure 1 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0025] Figure 2 The structure schematic view of the operation handle provided in the embodiment of the utility model is provided.

[0026] Figure 3 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0027] Figure 4 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0028] Figure 5 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0029] Figure 6 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0030] Figure 7 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0031] Figure 8 The structure schematic view of the thrombus removing device in the embodiment of the utility model is provided.

[0032] Figure 9The structure schematic diagram of the bolt taking member is provided in another embodiment of the utility model.

[0033] Figure 10 The structure schematic diagram of the bolt taking member is provided in another embodiment of the utility model.

[0034] The number 1 is the operating handle, the number 11 is the push-pull assembly, the number 111 is the locking member, the number 112 is the push-pull part, the number 113 is the sliding rod, the number 12 is the control handle, the number 121 is the handle body, the number 122 is the fixed lock catch, the number 2 is the conveying guide pipe, the number 21 is the pipe body, the number 22 is the fixed ring, the number 23 is the strain release sleeve, the number 3 is the guide member, the number 4 is the bolt taking member, and the number 5 is the guide member. DETAILED DESCRIPTION

[0035] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings, and obviously, the described embodiments are some of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0036] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation on the utility model. In addition, the terms "first", "second", "third" are only for the description purpose, and cannot be understood as indicating or implying the relative importance.

[0037] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through the intermediate medium, or the communication inside two elements. The specific meaning of the above terms in the utility model can be understood according to the specific circumstances by the ordinary skilled in the art.

[0038] In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0039] EMBODIMENT

[0040] As Figures 1 to 5The thrombectomy device provided by the embodiment comprises a delivery catheter 2, a guide 3 and a thrombus removing member 4. In the embodiment, the guide 3 is a guide wire rod, and the thrombus removing member 4 is a metal mesh structure. The thrombus removing member 4 is formed by eight platinum core nickel-titanium wires with developing performance being wound with each other. The guide wire rod is located at the center of the thrombus removing member 4 with the basket structure and coaxial with the thrombus removing member 4, thereby providing support when the basket structure is axially deformed.

[0041] The guide 3 extends along the inner cavity of the delivery catheter 2, and the guide 3 protrudes from the head of the delivery catheter 2 to the outside of the delivery catheter 2. One end of the thrombus removing member 4 is fixedly connected with the head of the delivery catheter 2, and the other end is fixedly connected with the guide 3. The thrombus removing member 4 has an expanded state when subjected to external stress applied by the guide 3 and a contracted state when there is no external stress.

[0042] In order to facilitate the thrombus removing member 4 to advance inside the blood vessel, a guide 5 is fixedly connected with the head of the thrombus removing member 4. The guide 5 is fixedly connected with the distal end of the thrombus removing member 4 and the distal end of the guide 3, and the front end of the guide 5 is provided with an arc-shaped portion. In order to improve the stability of the connection between the delivery catheter 2 and the thrombus removing member 4, a fixing ring 22 is arranged at the end of the delivery catheter 2 connected with the thrombus removing member 4, and the proximal end of the thrombus removing member 4 with the basket structure is fixedly connected with the delivery catheter 2 through the fixing ring 22. The guide wire rod as the guide 3 is located at the central axis of the guide 5, the thrombus removing member 4 and the delivery catheter 2, and is combined into a coaxial structure. When passing through the area inside the blood vessel which is curved and circuitous, the guide device as a whole moves in the blood vessel by abutting against the blood vessel wall through the arc-shaped portion. The guide 5 is made of nickel-titanium alloy material with developing performance, and the distal end is designed to be smooth to avoid breaking the thrombus when penetrating into the thrombus.

[0043] In order to facilitate the thrombus removing member 4 to advance inside the blood vessel, a guide 5 is fixedly connected with the head of the thrombus removing member 4. The guide 5 is fixedly connected with the distal end of the thrombus removing member 4 and the distal end of the guide 3, and the front end of the guide 5 is provided with an arc-shaped portion. In order to improve the stability of the connection between the delivery catheter 2 and the thrombus removing member 4, a fixing ring 22 is arranged at the end of the delivery catheter 2 connected with the thrombus removing member 4, and the proximal end of the thrombus removing member 4 with the basket structure is fixedly connected with the delivery catheter 2 through the fixing ring 22. The guide wire rod as the guide 3 is located at the central axis of the guide 5, the thrombus removing member 4 and the delivery catheter 2, and is combined into a coaxial structure. When passing through the area inside the blood vessel which is curved and circuitous, the guide device as a whole moves in the blood vessel by abutting against the blood vessel wall through the arc-shaped portion. The guide 5 is made of nickel-titanium alloy material with developing performance, and the distal end is designed to be smooth to avoid breaking the thrombus when penetrating into the thrombus.

[0044] The delivery catheter 2 comprises a tube body 21 and a strain relief sleeve 23 and a fixing ring 22 respectively installed at both ends of the tube body 21. In order to improve the stability of the connection between the delivery catheter 2 and the operating handle 1, avoid separation between the delivery catheter 2 and the operating handle 1 during operation, and prevent the device from being bent and deformed at the connection between the delivery catheter 2 and the operating handle 1, a strain relief sleeve 23 is installed at one end of the delivery catheter 2 and the strain relief sleeve 23 is fixedly sleeved on the tube body 21. The end of the slide rod 113 of the push-pull assembly 11 away from the control handle 12 is provided with a locking nut as a locking member 111, and the strain relief sleeve 23 on the delivery catheter 2 is threadedly connected with the locking nut.

[0045] When the thrombus removal device provided by the present embodiment is used for thrombus removal, the delivery catheter 2 is pulled to apply an axial force to the proximal end of the thrombus removal member 4, and the distal end of the thrombus removal member 4 is fixed by the guide member 5. At this time, the thrombus removal member 4 is subjected to an axial pulling force and is in a tubular shape. When the push handle is pushed, the delivery catheter 2 applies an axial pushing force to the proximal end of the basket structure, and the distal end of the thrombus removal member 4 is fixed by the guide member 5. At this time, the thrombus removal member 4 is subjected to an axial pushing force and is in a mesh disc shape. The thrombus removal device provided by the present embodiment. The guide wire rod is made of nickel-titanium alloy, which provides support. The guide member 5 and the fixing ring 22 on the delivery catheter 2 are made of platinum-iridium alloy, which has imaging properties. The thrombus removal member 4 of the basket structure is woven from platinum core nickel-titanium wire. The delivery catheter 2 can be made of a variety of materials, including but not limited to stainless steel, polytetrafluoroethylene, polyethylene, thermoplastic elastomer, ABS plastic or other polymer materials. The strain relief sleeve 23 can be made of a variety of materials, including but not limited to polytetrafluoroethylene, polyethylene or other polymer materials.

[0046] The operating handle 1 comprises a locking nut, a push-pull ring, and a slide rod 113, which are made of ABS plastic or other polymer materials. The handle comprises a main rod and a fixed lock 122, the main rod is made of ABS plastic or other polymer materials, and the fixed lock 122 is made of stainless steel. The thrombus removal member 4 can scrape and intercept thrombus after contraction. In some other embodiments, as shown in Figure 6 and Figure 7 The thrombus removal member 4 can be a thrombus removal basket structure, and the expanded part can be one or more; as shown in Figures 8 to 10 The thrombus removal assembly can also be a thrombus removal stent, and the multiple filaments on the thrombus removal stent can be arranged in a staggered manner or in a sequential manner. The expanded thrombus removal stent can be flat or spherical.

[0047] When the thrombus removing member 4 is in the stretched state, the outer diameter is small and can easily pass through the thrombus. The outer diameter of the compressed thrombus removing member 4 is adjusted by the control handle, which can adapt to different vessel diameters and effectively remove the thrombus with small vessel damage. The thrombus removing member 4 has a woven structure and is in a mesh disc shape when compressed, which can tightly adhere to the vessel wall to avoid thrombus escape.

[0048] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhaustively listed. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A thrombus removal device, characterized in that: include: a delivery catheter (2); A guide member (3) extends along the inner cavity of the delivery catheter (2), and the guide member (3) extends from the head of the delivery catheter (2) to the outside of the delivery catheter (2); A thrombus removal member (4) has one end fixedly connected to the head of the delivery catheter (2) and the other end fixedly connected to the guide member (3). The thrombus removal member (4) has an expanded state when subjected to external stress applied by the guide member (3) and / or the delivery catheter (2) and a contracted state when there is no external stress.

2. The thrombus removal device according to claim 1, characterized in that: The head of the plug-removing member (4) is fixedly connected to a guide member (5), and the guide member (5) is fixedly connected to the guiding member (3).

3. The thrombus removal device according to claim 2, characterized in that: The front end of the guide member (5) is provided with an arc portion.

4. The thrombus removal device according to any one of claims 1 to 3, characterized in that: An operating handle (1) is installed at the tail of the delivery catheter (2), and the guide member (3) is detachably connected to the operating handle (1).

5. The thrombus removal device according to claim 4, characterized in that: The operating handle (1) comprises a push-pull assembly (11) and a control handle (12); one end of the push-pull assembly (11) is slidably connected to the control handle (12), and the other end is fixedly connected to the delivery conduit (2); and the guide member (3) is detachably connected to the control handle (12).

6. The thrombus removal device according to claim 5, characterized in that: The control handle (12) comprises a handle body (121) and a fixed lock buckle (122) mounted on the handle body (121), and the guide member (3) is mounted in cooperation with the fixed lock buckle (122).

7. The thrombus removal device according to claim 5 or 6, characterized in that: The push-pull assembly (11) comprises a slide bar (113) slidably matched with the control handle (12) and a push-pull portion (112) mounted on the slide bar (113), wherein the push-pull portion (112) extends outward around the circumference of the slide bar (113).

8. The thrombus removal device according to claim 7, characterized in that: A locking piece (111) is installed at one end of the slide rod (113) away from the control handle (12), and the delivery conduit (2) is detachably connected to the locking piece (111).

9. The thrombus removal device according to claim 4, characterized in that: A strain relief sleeve (23) is installed at one end of the delivery conduit (2) that is cooperatively connected to the operating handle (1), and the strain relief sleeve (23) is fixedly sleeved and installed outside the delivery conduit (2).

10. The thrombus removal device according to any one of claims 1 to 3, characterized in that: One end of the delivery catheter (2) connected to the thrombus removal member (4) is provided with a fixing ring (22), and the thrombus removal member (4) is cooperatively connected to the fixing ring (22).

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