CN218045267U - Thrombus taking device and thrombus taking system - Google Patents

Abstract

The utility model provides a get and tie device and system of getting. Wherein, it includes to get the bolt device: the device comprises an interception net, a bracket and a conveying device; the interception net is connected to the far end of the bracket, and the interception net and the bracket both have a contraction state and an expansion state; in the expanded state, the maximum cross section of the interception net is larger than or equal to the maximum cross section of the bracket; the conveying device comprises a control wire and a pushing rod; the far end of the push rod is connected with the near end of the bracket; a control wire is connected to the barrier net and extends proximally through the stent to control transition of the stent between the contracted state and the expanded state. Therefore, under the action of the interception net, the metal coverage rate of the far end of the bracket is increased, so that the problem of escape of the broken embolus is relieved, the risk of secondary embolism is avoided, and the embolus taking effect is improved. And, the utility model discloses still utilize the control silk to control the shrink degree or the inflation degree of support to avoid the radial holding power of support too big or not enough, lead to unable and blood vessel matched with problem.

Description

Thrombus taking device and thrombus taking system

Technical Field

The utility model relates to the technical field of medical equipment, in particular to get and tie device and get system of tying.

Background

Acute stroke is the third leading cause of death today and is the leading cause of disability in adults. Among them, ischemic stroke accounts for about 85% of acute stroke. Ischemic stroke is mainly caused by embolism of a larger blood vessel (with the diameter of more than 2 mm), and the fatality rate of the ischemic stroke is 53-92%. At present, the treatment options for embolization are mainly mechanical embolization and drug thrombolysis.

The mechanical thrombus removal is mainly realized by puncturing the femoral artery, passing a thrombus removal device through the blood vessel to the position of the blood vessel occlusion, and removing the thrombus through the thrombus removal device or a thrombus extraction catheter, so that the aim of recovering the blood flow of the blood vessel is fulfilled. Compared with the medicine thrombolysis, the mechanical thrombolysis obviously improves the blood vessel recanalization rate. At present, the thrombus taking support is generally designed by cutting a hollow structure on a tubular material, cutting thrombus by utilizing a wave rod of the support, embedding the inside of the thrombus and withdrawing the thrombus taking support to achieve the aim of removing the thrombus.

The existing thrombus taking support is of a tubular structure, broken thrombus formed by cutting cannot be effectively removed, and the broken thrombus is easy to escape to a far-end blood vessel to cause secondary embolism. Wherein, the cutting state of the bracket can not control the release state in the release process. In addition, the expansion degree of the common braided stent needs to be carefully regulated and controlled in the retraction process, and thrombus embedded into the stent is easily extruded by the middle catheter, so that the thrombus extraction effect is influenced.

Therefore, a new embolectomy device is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thrombectomy device and thrombectomy system to solve and how to avoid the too big or not enough of support radial support power, and at least one problem in the thrombus escape.

In order to solve the technical problem, the utility model provides a bolt taking device, include: the device comprises an interception net, a bracket and a conveying device;

the interception net is connected to the far end of the bracket, and the interception net and the bracket both have a contraction state and an expansion state; in the expanded state, the maximum cross-section of the interception mesh is greater than or equal to the maximum cross-section of the stent;

the conveying device comprises a control wire and a pushing rod; the far end of the push rod is connected with the near end of the bracket; the control wire is connected to the intercepting mesh and extends proximally through the stent to control the transition of the stent between the contracted state and the expanded state.

Optionally, in the thrombus removal device, the central position of the intercepting net is located on the central axis of the bracket.

Optionally, in the thrombus removal device, in the expanded state, an included angle range between the outer surface of the intercepting net and the control wire is as follows: 90 to 180 degrees.

Optionally, in the embolectomy device, in the expanded state, the intercepting net is in a horn shape, a bowl shape or a disc shape, and an opening of the intercepting net faces to a distal end.

Optionally, in the thrombus removal device, the interception net is formed by integrally weaving woven filaments, and the range of porosity of the interception net is as follows: 5pore/mm ² ～25pore/mm ² 。

Optionally, in the thrombus removal device, the diameter range of the braided wire is as follows: 0.0254 mm-0.2540 mm.

Optionally, in the thrombus removal device, two opposite ends of the bracket are fixed by a positioning element, and a channel for the control wire to pass through is arranged in the positioning element.

Optionally, in the thrombus removal device, the positioning members located at the distal end and the proximal end of the bracket are respectively connected with the proximal end of the intercepting net and the distal end of the pushing rod.

Optionally, in the thrombus removal device, the positioning element is a coil or a tube body.

Optionally, in the thrombus removal device, the thrombus removal device includes a plurality of brackets, and the brackets are connected in sequence; the control wire passes through a plurality of the stents in sequence and extends towards the proximal end.

Optionally, in the thrombus removal device, a development mark is disposed on an outer surface of a distal end of the pushing rod, and the proximal end of the bracket is fixed to the distal end of the pushing rod through the development mark.

Optionally, in the thrombus removal device, the conveying device further includes a sleeve sleeved on an outer surface of the development mark.

Optionally, in the thrombus removal device, the developing mark is a developing spring or a developing sleeve.

Optionally, in the thrombus removal device, a channel is arranged in the push rod, and the proximal end of the control wire is inserted into the channel; or the proximal end of the control wire is arranged outside the push rod.

Optionally, in the embolectomy device, the delivery device further comprises a handle; the handle is connected with the near end of the push rod; the handle is provided with a control element, the control element is connected with the near end of the control wire, and the control element controls the control wire to move towards the near end or the far end.

Optionally, in the embolectomy device, the control element is a slider, and the slider is slidably connected to the handle.

Based on the same utility model, the utility model also provides a bolt taking system, which comprises a conveying pipe and the bolt taking device; the conveying pipe is used for accommodating the thrombus taking device so as to convey or retract the support and the intercepting net.

Optionally, in the bolt-removing system, when the interception net is separated from the conveying pipe, the interception net is converted from a contracted state to an expanded state; and when the interception net is withdrawn to the conveying pipe, the interception net is converted into a contraction state from an expansion state.

To sum up, the utility model provides a get and tie device and get system of tying. Wherein, the thrombectomy device includes: the device comprises an interception net, a bracket and a conveying device; the interception net is connected to the far end of the bracket, and the interception net and the bracket both have a contraction state and an expansion state; in the expanded state, the maximum cross-section of the interception mesh is greater than or equal to the maximum cross-section of the stent; the conveying device comprises a control wire and a pushing rod; the far end of the push rod is connected with the near end of the bracket; the control wire is attached to the intercepting mesh and extends proximally through the stent to control the transition of the stent between the contracted state and the expanded state. Therefore, under the action of the interception net, the metal coverage rate of the far end of the bracket is increased, the interception rate of the broken embolus is improved, the escape problem of the broken embolus is relieved, the risk of secondary embolism is avoided, and the embolus taking effect is improved. And, the utility model discloses still utilize control silk controls the shrink degree or the inflation degree of support to avoid the radial holding power of support too big or not enough, lead to unable and blood vessel matched with problem.

Therefore, the utility model discloses can not only avoid the radial holding power of support too big or not enough, realize the degree of the inflation and the shrink of control support, can also prevent the thrombus escape, improve and get the bolt effect.

Drawings

FIGS. 1-3 are schematic views illustrating a process for transitioning a stent from a contracted state to an expanded state according to an embodiment of the present invention;

fig. 4-6 are schematic views illustrating the process of withdrawing the stent in the embodiment of the present invention;

wherein the reference numerals are:

100-an interception net; 101-a scaffold; 102-control wire; 103-a push rod; 104-a positioning element; 105-development mark; 106-a handle; 107-control elements; 200-conveying pipe.

Detailed Description

To make the objects, advantages and features of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to scale, but rather are provided for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently. It should be further understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and are not intended to imply a logical or sequential relationship between various components, elements, steps, or the like, unless otherwise indicated or indicated.

The definitions of "proximal" and "distal" herein are: "distal" generally refers to the end of the medical device that first enters the patient during normal operation, while "proximal" generally refers to the end of the medical device that is closer to the operator during normal operation.

Referring to fig. 1, the present embodiment provides a thrombus removal device, including: the intercepting net 100, the bracket 101 and the conveying device; the intercepting net 100 is connected to the distal end of the stent 101, and both the intercepting net 100 and the stent 101 have a contracted state and an expanded state; in the expanded state, the maximum cross section of the interception mesh 100 is greater than or equal to the maximum cross section of the stent 101; the conveying device comprises a control wire 102 and a pushing rod 103; the far end of the push rod 103 is connected with the near end of the bracket 101; the control wire 102 interfaces with the barrier net 100 and extends proximally through the stent 101 to control the transition of the stent 101 between the contracted state and the expanded state.

Therefore, under the action of the interception net 100, the problem of escape of broken embolus can be relieved, the risk of secondary embolism is avoided, and the thrombus extraction effect is improved. In addition, the thrombus removal device provided by this embodiment further uses the control wire 102 to control the contraction degree or expansion degree of the stent 101, so as to avoid the problem that the stent 101 cannot be matched with a blood vessel due to excessive or insufficient radial supporting force. Therefore, the thrombus removal device provided by the embodiment can not only avoid the overlarge or insufficient radial supporting force of the stent 101, realize the control of the expansion and contraction degree of the stent 101, but also prevent the thrombus from escaping and improve the thrombus removal effect.

The embolectomy device provided in the present embodiment is specifically described below with reference to fig. 1-6.

With continued reference to fig. 1, the intercepting net 100 is used to increase the metal coverage of the distal end of the stent 101, and to prevent the escape of the broken embolus during capturing the blood vessel and withdrawing the stent 101, thereby avoiding the risk of secondary embolism and improving the embolus-removing effect. Wherein, the intercepting net 100 is connected with the far end of the bracket 101 and is integrally woven by weaving wires. Alternatively, the braid may be formed from a single strand or multiple strands of biocompatible material that are helically braided. Further, the interception mesh 100 has a contracted state and an expanded state, and in the expanded state, the maximum cross section of the interception mesh 100 is greater than or equal to the maximum cross section of the stent 101. To ensure that the intercepting net 100 can completely block the broken bolt from escaping from the far end of the bracket 101, it is preferable that the intercepting net 100 is located at the central axis of the bracket 101. In other words, the center point of the intercepting net 100 is connected with the center point of the distal end of the stent 101, so that in the expanded state, the spread intercepting net 100 can completely cover the distal end of the stent 101, so as to ensure that the thrombus can be intercepted in the maximum range.

In the expanded state, the interception mesh 100 is trumpet-shaped, bowl-shaped or disc-shaped, and the opening of the interception mesh 100 faces the distal end. In other words, the end of the intercepting net 100 remote from the distal end of the bracket 101 is free and free. While the portion near the distal end of the stent 101 is constrained to a central position of the distal end of the stent 101. And at different degrees of expansion, the intercepting net 100 may be trumpet-shaped, bowl-shaped or disk-shaped, i.e. the greater the degree of expansion, the larger the cross-sectional area of the free end, and the closer the free end is to the distal end of the stent 101. In order to ensure the intercepting effect, in the expanded state, the included angle range between the outer surface of the intercepting net 100 and the control wire 102 is as follows: 90 to 180 degrees. The interception net 100 has a porosity range of: 5pore/mm ² ～25pore/mm ² 。

In the contracted state, the barrier webs 100 are compressed together. To ensure the interception area of the interception mesh 100 and to be able to be compressed into a microcatheter of 0.027in and the following dimensions, the diameter range of the braided wire forming the interception mesh 100 is: 0.0254 mm-0.2540 mm. The method can be selected as follows: 0.0254mm, 0.0500mm, 0.1000mm, or 0.2540mm.

With continued reference to fig. 1, the stent 101 is used to capture and morcellate a blood vessel. Optionally, the stent 101 is a braided stent, and the material thereof includes, but is not limited to, nickel-titanium alloy, cobalt-chromium alloy, DFT material, or tantalum alloy. Further, the structure of the stent 101 may be a single-layer one-to-one, two-to-one, or two-to-two structure, may be a double-layer structure, or may be a composite structure of multiple layers or several structures. In this embodiment, the number of the brackets 101 is not limited, and may be 1, 2, 4, 5, or 6 in fig. 1, and the brackets 101 are sequentially connected along an axis. Different lengths of the stent 101 may be selected according to different lesion conditions.

The opposite ends of the bracket 101 are fixed by a positioning member 104, and a passage for the control wire 102 to pass through is arranged in the positioning member 104. The positioning members 104 at the distal end and the proximal end of the bracket 101 are respectively connected to the proximal end of the intercepting net 100 and the distal end of the pushing rod 103. When a plurality of the brackets 101 are provided, the adjacent brackets 101 are connected by the positioning member 104, and the connection manner includes, but is not limited to, welding, hot melting, or bonding. Further, the positioning element 104 is provided with a passage for the control wire 102 to pass through, and the positioning element 104 may be a coil formed by winding a metal wire, for example, a platinum-tungsten wire to form a ring, or a thin-walled tube. Of course, the material of the positioning member 104 may also be a developing material, such as radiopaque metal, such as gold, platinum or tantalum, or a radiopaque polymer material. The positioning member 104 may also be formed by an inner tube and an outer tube, and the proximal end or the distal end of the stent 101 is located between the inner tube and the outer tube. Therefore, when the control wire 102 is pulled, the stent 101 will gradually expand under the constraint and fixed connection of the positioning member 104, so as to control the expansion of the stent 101, avoid the excessive or insufficient radial supporting force of the stent 101, and reduce the injury of the blood vessel.

The far end of the push rod 103 is connected with the near end of the bracket 101, and the near end of the push rod 103 is connected with the handle 106. The pushing rod 103 mainly plays a pushing role and is used for transmitting pushing force of the near end. Therefore, the push rod 103 may be a relatively rigid metal tube, and the material of the push rod includes, but is not limited to, stainless steel, cobalt-chromium alloy, or nickel-titanium alloy. The push rod 103 may also be a closed tube or a cut hypotube.

Further, in order to control the feeding, a development mark 105 is provided on the outer surface of the distal end of the push rod 103. The development mark 105 includes, but is not limited to, a development spring or a development sleeve. Wherein the proximal end of the stent 101 is fixed to the distal end of the pushing rod 103 through the developing mark 105 of the distal end of the pushing rod 103. Further, the conveying device further includes a sleeve (not shown) to be sleeved on the developing mark 105 for protecting the developing mark 105. Meanwhile, the sleeve is made of a high polymer material and can play a role in lubrication, so that the conveying device can be pushed by small force in the micro-catheter, and the over-bending capacity of the conveying device is enhanced.

The control wire 102 is used for controlling the expansion or compression degree of the stent 101, and avoids the problem that the stent 101 cannot be matched with a blood vessel due to overlarge or insufficient radial supporting force. Wherein the distal end of the control wire 102 is fixedly connected with the interception net 100 and the proximal end of the stent 101, so that the distance between the interception net 100 and the pushing rod 103 is reduced or enlarged by pulling the control wire 102, that is, the change of the compressed or expanded state of the stent 101 is realized. The proximal end of the control wire 102 passes through the stent 101 and extends proximally. A channel is arranged in the pushing rod 103, and the proximal end of the control wire 102 can penetrate into the pushing rod 103; alternatively, the proximal end of the control wire 102 is disposed outside the pushing rod 103, i.e., the proximal end of the control wire 102 does not extend into the pushing rod 103, but only extends out from the proximal end of the stent 101.

The handle 106 is disposed at a proximal end of the pushing rod 103 for facilitating holding operation by an operator. Wherein, a control element 107 is arranged on the handle 106, the control element 107 is connected with the proximal end of the control wire 102, and the control element 107 controls the control wire 102 to move towards the proximal end or the distal end. Further, the handle 106 is further provided with a guide rail axially disposed thereon, and the control element 107 is a slider, which is connected to the guide rail and can slide along the guide rail. Therefore, the operator can slide the slider to pull the control wire 102, thereby changing the shape of the stent 101.

The stent 101 has an expanded state and a contracted state. Referring to fig. 1-3, the stent 101 may be transformed from a contracted state to an expanded state and its degree of expansion may be gradually changed by sliding the control element 107 in the V direction. When the control member 107 slides in the direction opposite to the V direction, the stent 101 can be changed from the expanded state to the contracted state and the degree of contraction thereof is gradually changed. In the contracted state, as shown in fig. 1, the control element 107 is in the initial state, and the stent 101 is under a certain tension to be contracted into an elongated shape for convenient intrathecal delivery. As shown in FIG. 2, when the control member 107 slides a certain distance in the V direction, the stent 101 starts to gradually expand in a cylindrical shape so as to catch and cut up thrombus. As shown in fig. 3, when the control member 107 is further slid in the V direction, the stent 101 is expanded to the highest degree, taking the shape of an oval. Otherwise, the stent 101 is converted from the expanded state to the contracted state, which is not described in detail in this embodiment.

Based on the same utility model concept, this embodiment still provides a system of taking a bolt. As shown in fig. 4, the embolectomy system comprises a delivery tube 200 and the embolectomy device; the delivery pipe 200 is used for accommodating the embolectomy device to deliver or withdraw the stent 101 and the intercepting net 100. Further, the intercepting net 100 is in an expanded state before entering the delivery pipe 200. When the intercepting net 100 is retracted to the delivery pipe 200, the intercepting net 100 is changed from the expanded state to the contracted state. When the intercepting net 100 is separated from the conveying pipe 200, the intercepting net 100 is changed from a contracted state to an expanded state.

When the embolectomy device is delivered to a target site, the stent 101 is in a contracted state, as shown in fig. 1. Also, the intercepting net 100 is contracted by an external force so as to be accommodated in the transporting pipe 200. When the target position is reached, the intercepting net 100 is firstly separated from the conveying pipe 200 and is converted from the contraction state to the expansion state under the action of self expansion. After the stent 101 is detached from the delivery tube 200, it is gradually expanded to the expanded state by the control wire 102 and the control element 107.

As shown in fig. 4-6, after the stent 101 completes the thrombus capture operation at the target position, the stent 101 enters a retraction link, and the stent 101 enters the delivery tube 200 first. As shown in fig. 4, when the stent 101 is subjected to a compressive force by the restraint of the delivery tube 200, the thrombus trapped in the stent 101 risks escaping toward the distal end of the stent 101. The interception net 101 is in an expanded state, so that the metal coverage rate of the far end of the support 101 is increased, the interception rate of the broken embolus is improved, the risk of escape and secondary embolism of the broken embolus is avoided, and the embolus taking effect is improved. When the thrombus removal device is further moved in the direction of V', as shown in FIG. 5, the stent 101 is completely inserted into the delivery tube 200, and the intercepting net 100 is still in the expanded state to intercept the escaped thrombus. When the thrombus removal device further moves along the direction V', as shown in fig. 6, the intercepting net 100 is pressed by the conveying pipe 200 to be in a disc shape, so that after the stent 101 completely enters the conveying pipe 200, the escaping thrombus can be still intercepted for a while, and the thrombus removal effect is improved. Finally, the intercepting net 100 is in a contracted state, is accommodated in the delivery pipe 200, and leaves a target position along with the delivery pipe 200.

In summary, the present embodiment provides a thrombus removal device and a thrombus removal system. Wherein, the thrombectomy device includes: the intercepting net 100, the bracket 101 and the conveying device; the intercepting net 100 is connected to the distal end of the stent 101, and the intercepting net 100 and the stent 101 both have a contracted state and an expanded state; in the expanded state, the maximum cross section of the interception mesh 100 is greater than or equal to the maximum cross section of the stent; the conveying device comprises a control wire 102 and a pushing rod 103; the far end of the push rod 103 is connected with the near end of the bracket 101; the control wire 102 interfaces with the barrier net 100 and extends proximally through the stent to control the transition of the stent 101 between the contracted state and the expanded state. Therefore, under the action of the interception net 100, the interception rate of the broken embolus is improved, the escape problem of the broken embolus is relieved, the risk of secondary embolism is avoided, and the embolus taking effect is improved. In addition, the control wire 102 is further utilized to control the contraction degree or expansion degree of the stent 101 in the embodiment, so as to avoid the problem that the stent 101 cannot be matched with a blood vessel due to excessive or insufficient radial supporting force. Therefore, the thrombus removal device and the thrombus removal system provided by the embodiment can not only avoid the overlarge or insufficient radial supporting force of the stent 101, realize the control of the expansion and contraction degree of the stent 101, but also prevent the thrombus from escaping and improve the thrombus removal effect.

It should also be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, the foregoing description is not intended to limit the invention. To anyone skilled in the art, without departing from the scope of the present invention, the technical solution disclosed above can be used to make many possible variations and modifications to the technical solution of the present invention, or to modify equivalent embodiments with equivalent variations. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.

Claims (18)

1. A thrombectomy device, comprising: the device comprises an interception net, a bracket and a conveying device;

the interception net is connected to the far end of the bracket, and the interception net and the bracket both have a contraction state and an expansion state; in the expanded state, the maximum cross-section of the interception mesh is greater than or equal to the maximum cross-section of the stent;

the conveying device comprises a control wire and a pushing rod; the far end of the push rod is connected with the near end of the bracket; the control wire is attached to the intercepting mesh and extends proximally through the stent to control the transition of the stent between the contracted state and the expanded state.

2. The embolectomy device of claim 1, wherein the central position of the intercepting screen is located on the central axis of the stent.

3. The embolectomy device of claim 1, wherein in the expanded state, the outer surface of the intercepting screen and the control wire are oriented at an angle within the range of: 90 to 180 degrees.

4. The embolectomy device of claim 1, wherein in the expanded state, the interception mesh is trumpet-shaped, bowl-shaped, or disc-shaped, and the opening of the interception mesh faces distally.

5. The embolectomy device of claim 1, wherein the intercepting screen is integrally woven from woven filaments and has a porosity range of: 5pore/mm ² ～25pore/mm ² 。

6. The embolectomy device of claim 5, wherein the braided wire has a range of diameters: 0.0254 mm-0.2540 mm.

7. The embolectomy device of claim 1, wherein the opposite ends of the stent are fixed by positioning members, and a channel for the control wire to pass through is arranged in the positioning members.

8. The embolectomy device of claim 7, wherein the positioning members at the distal and proximal ends of the stent are respectively connected to the proximal end of the intercepting net and the distal end of the pushing rod.

9. The embolectomy device of claim 7, wherein the positioning element is a coil or a tube.

10. The embolectomy device of claim 1, wherein the embolectomy device comprises a plurality of the brackets, and the brackets are connected in sequence; the control wire passes through a plurality of the stents in sequence and extends towards the proximal end.

11. The embolectomy device of claim 1, wherein the outer surface of the distal end of the push rod is provided with a visualization mark, and the proximal end of the stent is fixed to the distal end of the push rod by the visualization mark.

12. The embolectomy device of claim 11, wherein the delivery device further comprises a sleeve disposed around an outer surface of the visualization marker.

13. The embolectomy device of claim 11, wherein the visualization marker is a visualization spring or a visualization sleeve.

14. The embolectomy device of claim 1, wherein a channel is arranged in the pushing rod, and a proximal end of the control wire is arranged in the channel; alternatively, the proximal end of the control wire is disposed outside of the push rod.

15. The embolectomy device of claim 1, wherein the delivery device further comprises a handle; the handle is connected with the near end of the push rod; the handle is provided with a control element, the control element is connected with the near end of the control wire, and the control element controls the control wire to move towards the near end or the far end.

16. The embolectomy device of claim 15, wherein the control element is a slider, the slider being slidably connected to the handle.

17. A thrombectomy system comprising a delivery tube and a thrombectomy device according to any one of claims 1-16; the conveying pipe is used for accommodating the thrombus taking device so as to convey or retract the support and the intercepting net.

18. The retrieval system of claim 17, wherein the interception mesh is transformed from a contracted state to an expanded state during detachment from the transportation pipe; and when the interception net is withdrawn to the conveying pipe, the interception net is converted into a contraction state from an expansion state.

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