CN212699045U

CN212699045U - Double-deck bolt support of getting with adjustable net

Info

Publication number: CN212699045U
Application number: CN202020849363.3U
Authority: CN
Inventors: 胡伟; 王越; 张晨朝; 王君毅; 时玉楠; 王国辉
Original assignee: Shanghai Xinwei Medical Technology Co ltd
Current assignee: Shanghai Xinwei Medical Technology Co ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2021-03-16
Anticipated expiration: 2030-05-19

Abstract

The utility model discloses a grid-adjustable double-layer thrombus removal support, which relates to the technical field of medical instruments, and comprises an outer thrombus removal support and an inner thrombus removal support, wherein the inner thrombus removal support is arranged inside the outer thrombus removal support, the cross sections of the outer thrombus removal support and the inner thrombus removal support are both of a closed loop structure, the outer thrombus removal support is provided with a plurality of first symmetrical grids, and the inner thrombus removal support is provided with a plurality of second symmetrical grids; the other end of the inner-layer embolectomy support is provided with a support traction end, and the inner-layer embolectomy support moves relative to the outer-layer embolectomy support through the support traction end. The utility model discloses a change ectonexine support relative position and adjust support net size, and then reach both easily the support and passed the thrombus, avoided the problem that the thrombus drops again.

Description

Double-deck bolt support of getting with adjustable net

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a double-deck bolt support of getting with adjustable net.

Background

Cerebral apoplexy is one of the common diseases in the world at present, and has the characteristics of high morbidity, high morbidity and high disability rate. The annual incidence rate of urban cerebrovascular diseases in China is 219/10 ten thousand, the annual incidence rate in rural areas is 185/10 ten thousand, and the annual incidence rate is increased year by year. The prevalence of cerebrovascular disease has risen from 5.9% to 9.7% from 1998 to 2008. About three-quarters of the patients with viable cerebrovascular disease have different degrees of disability, and 80% of stroke patients are reported to have different degrees of limb dysfunction, and 43.7% of them cannot take care of their lives. In the prior art, rt-PA thrombolytic by intravenous injection is the only treatment method for acute phase cerebral infarction proved to be effective by evidence-based medicine at present. However, the intravenous thrombolytic therapy has long time, great damage to ischemic brain tissue and bleeding risk, and very low recanalization rate; the recanalization rate of basilar artery thrombolysis is only about 30%, the recanalization rate of lesion thrombolysis at the tail end of carotid artery is only 6%, and the recanalization rate of common carotid artery thrombolysis is only about 27%. And the time window for intravenous thrombolysis is only about 4 hours. From the above, the single use of venous thrombolysis for cerebral artery occlusion is far from sufficient, and the single use of venous thrombolysis may not be sufficient to meet the actual clinical requirements.

The thrombus taking system can be used for removing thrombus in intracranial large blood vessels of patients with ischemic stroke so as to restore blood flow. During clinical operation, a guide catheter is placed according to a standard interventional operation method to obtain a vascular access, the position of vascular embolism is determined according to angiography, and then a microcatheter is led to reach the position of vascular embolism by the guide catheter; the stent part of the thrombus taking device is put into the guide sheath, then the thrombus taking device enters the micro catheter along the guide sheath, the thrombus taking device is slowly pushed to reach the thrombus position along the micro catheter, and then the micro catheter is carefully withdrawn to release the thrombus taking stent; after a few minutes, the micro-catheter and the thrombus removal device are simultaneously withdrawn by matching with the balloon catheter, and the micro-catheter and the thrombus removal device are withdrawn into the guide catheter and then withdrawn out of the body, so that the thrombus is removed out of the body.

However, the existing thrombus removal stents (such as patents CN109247969A, CN103417257B and CN108670353A) have problems that thrombus is easy to fall off in the thrombus removal process. In the stent expansion process, if the mesh of the stent main body is too small, the thrombus is not easy to pass through, the time consumption of the thrombus extraction process is long, the brain is easy to be irreversibly damaged due to too long cerebral ischemia time, and the thrombus is easy to be excessively cut up, so that the thrombus on the thrombus body can be flushed to other parts by blood flow to cause lesion; if the grid is too large, plug leakage is likely to occur. Therefore, if the thrombus removal stent is not properly designed, irreversible damage can be easily caused to the blood vessel, and other complications such as restenosis, blood vessel rupture and the like can be caused.

Therefore, the technical personnel in the field are dedicated to develop the grid-adjustable double-layer thrombus extraction bracket, the technical problem that the grid size of the traditional thrombus extraction bracket is not suitable is solved, the capturing capability of thrombus can be improved, and the phenomena of excessive thrombus cutting and thrombus falling off can be avoided.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is: how to solve the unsuitable technical problem of traditional thrombectomy support net size.

In order to achieve the purpose, the utility model relates to a grid-adjustable double-layer bolt taking support, which consists of an outer-layer bolt taking support and an inner-layer bolt taking support, wherein the inner-layer bolt taking support is arranged inside the outer-layer bolt taking support, the cross sections of the outer-layer bolt taking support and the inner-layer bolt taking support are both in a closed loop structure, the outer-layer bolt taking support is provided with a plurality of first symmetric grids, and the inner-layer bolt taking support is provided with a plurality of second symmetric grids; the other end of the inner-layer embolectomy support is provided with a support traction end, and the inner-layer embolectomy support moves relative to the outer-layer embolectomy support through the support traction end.

Further, the inner-layer embolectomy support is tightly attached to the outer-layer embolectomy support.

Further, the area of the first symmetrical grid is slightly larger than that of the second symmetrical grid.

Furthermore, one end of the inner-layer embolectomy support is provided with a straight hook.

Furthermore, the straight hook comprises a hook and a straight section, one end of the straight section is connected with the hook, and the other end of the straight section is connected with the inner-layer bolt taking support.

Further, outer bolt support one end is provided with solid fixed ring, gu fixed ring through the welded mode with outer bolt leg joint is got to the skin.

Further, the number of the fixing rings is consistent with that of the straight hooks.

Further, the fixed ring is of a circular ring structure, and the inner diameter of the fixed ring is close to that of the straight hook.

Further, the length of the straight section is one half of the length of the first symmetric mesh; the straight hook penetrates out of the fixing ring, and the maximum penetrating length is the length of the straight section.

Further, the embolectomy support is made of memory alloy.

Compared with the prior art, the utility model discloses following beneficial technological effect has at least:

the utility model provides a double-deck thrombectomy support with adjustable net, owing to its double-deck thrombectomy supporting structure who has, both realized the purpose that the support easily passed the thrombus, avoided the support net again with the excessively garrulous phenomenon of thrombus, increased the support to the performance of catching of thrombus, avoided the thrombus to drop.

The utility model discloses a double-deck bolt support of getting adopts solid fixed ring and straight hook to fix a position, and the relative position of having avoided the support takes place the uncontrollable skew and the expansion in-process net that leads to is in disorder phenomenon, has guaranteed the ability that the support expands the in-process and passes the thrombus.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic view of a double-layered embolectomy stent of the present invention;

FIG. 2 is a schematic view of the inner layer thrombectomy stent of the present invention;

FIG. 3 is a schematic view of the outer layer thrombectomy stent of the present invention;

FIG. 4 is a schematic diagram of the double-layered thrombectomy stent of the present invention after displacement of the inner-layered thrombectomy stent;

FIG. 5 is a top view of the double-layered thrombectomy support of the present invention;

FIG. 6 is a schematic diagram of the inner layer of the double-layer thrombectomy stent of the present invention;

FIG. 7 is a side view of the outer layer thrombectomy stent of the present invention;

wherein: 1-outer layer thrombus taking support; 2-inner layer thrombus taking support; 3-fixing the ring; 4-straight hook; 5-straight section; 6-hooking; 7-mesh length; 8-a first symmetric mesh; 9-a second symmetric mesh; 10-a stent traction end; 11-direction of displacement.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

As shown in fig. 1-7, the double-layered embolectomy stent of the present invention is made of memory alloy, has a certain self-expansion capacity after heat setting, can be pressed into a thin bundle and can be restored to a mesh tube structure after release. The thrombus removal support consists of an outer thrombus removal support 1 and an inner thrombus removal support 2, and the inner thrombus removal support 2 is arranged inside the outer thrombus removal support 1. The inner-layer embolectomy support 2 consists of a plurality of second symmetrical grids 9, and the cross section of the inner-layer embolectomy support 2 is of a closed-loop structure. The far end of the inner layer embolectomy support 2 is provided with a straight hook 4, the head end of the straight hook 4 is heat-shaped into a hook shape to form a hook 6; the straight hook 4 consists of a straight section 5 and a hook 6. The outer layer thrombus taking support 1 consists of a plurality of first symmetrical grids 8, the area of each first symmetrical grid 8 is slightly larger than that of each second symmetrical grid 9 so as to ensure that the inner layer thrombus taking support and the outer layer thrombus taking support are overlapped to the maximum extent, and the cross section of the outer layer thrombus taking support 1 is also of a closed loop structure.

The distal end of the outer layer thrombus removal support 1 is provided with a fixing ring 3, and the fixing ring 3 is connected with the outer layer thrombus removal support 1 in a welding mode. The number of the fixing rings 3 is the same as that of the straight hooks 4 at one end of the inner layer embolectomy support 2. The fixing ring 3 is of a circular ring structure, and the inner diameter of the fixing ring 3 is set to be close to that of the straight hook 4 in order to avoid the phenomenon that the inner diameter difference is too large to play a role in fixing the inner-layer bolt taking support 2. The straight hook 4 penetrates out of the fixing ring 3, and the penetrating length is the maximum length of the straight section 5, namely the joint of the straight hook 4 and the inner-layer embolectomy support 2 is overlapped with the fixing ring 3 of the outer-layer embolectomy support 1, so that the inner-layer embolectomy support 2 and the outer-layer embolectomy support 1 are overlapped to the maximum extent. The inner layer embolectomy support 2 is tightly attached to the outer layer embolectomy support 1. The other end of the inner layer embolectomy support 2 is also provided with a support traction end 10, the support traction end 10 is pulled, the inner layer embolectomy support 2 can move along the displacement direction 11, the maximum displacement length is the maximum length of the straight section 5, and the length of the straight section 5 is half of the grid length 7 of the first symmetrical grid 8. When the hooks 6 overlap the anchoring rings 3, as shown in fig. 4, the axial end points of the second symmetrical grid 9 of the inner embolic stent 2 are located at the axial center points of the first symmetrical grid 8 of the outer embolic stent 1.

The utility model discloses a get and tie device's main use as follows: in the blood vessel, free thrombus block is generated to block the artery branch at the far end for some reason, and a doctor pushes a micro-catheter to the near end of the artery blood vessel generating thrombus blockage in an interventional operation and penetrates thrombus, and then moves an embolectomy device containing a double-layer embolectomy stent from the inside of the micro-catheter to the far end of the thrombus. When the double-layer thrombus taking support enters the guiding sheath, the bent hooks 6 in the straight hooks 4 of the inner-layer thrombus taking support 2 are controlled to avoid bending (the support is easy to be pressed and held into a bundle), and the double-layer thrombus taking support is gradually released in a conical mode, expands and wraps thrombus from inside to outside. When the micro catheter at the thrombus is withdrawn, the head end of the straight hook 4 of the inner layer thrombus taking bracket 2 is restored to be a hook shape. After the double-layer thrombus taking support passes through thrombus, the inner-layer thrombus taking support 2 is displaced to the displacement direction 11 of the traction end through the support traction end 10, so that the size of the whole grid of the double-layer thrombus taking support is reduced. The main body grids of the stent are dense, so that the thrombus main body and the broken thrombus can be effectively prevented from escaping from the thrombus taking stent, the aim of completely taking out the thrombus is achieved, and finally the blood flow in the blood-carrying vessel is smooth after the thrombus is taken out.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The grid-adjustable double-layer thrombus removal support is characterized by comprising an outer-layer thrombus removal support and an inner-layer thrombus removal support, wherein the inner-layer thrombus removal support is arranged inside the outer-layer thrombus removal support, the cross sections of the outer-layer thrombus removal support and the inner-layer thrombus removal support are both of closed-loop structures, the outer-layer thrombus removal support is provided with a plurality of first symmetric grids, and the inner-layer thrombus removal support is provided with a plurality of second symmetric grids; the other end of the inner-layer embolectomy support is provided with a support traction end, and the inner-layer embolectomy support moves relative to the outer-layer embolectomy support through the support traction end.

2. The lattice adjustable dual layer embolic stent of claim 1, wherein the inner layer embolic stent is in close proximity to the outer layer embolic stent.

3. The grid adjustable double deck thrombectomy stent of claim 1, wherein the first symmetrical grid is slightly larger in area than the second symmetrical grid.

4. The mesh-adjustable double-layered embolectomy stent of claim 1, wherein one end of the inner-layer embolectomy stent is provided with a straight hook.

5. The grid adjustable dual layer embolic support of claim 4, wherein said straight hook is comprised of a hook and a straight section, one end of said straight section being attached to said hook and the other end of said straight section being attached to said inner layer embolic support.

6. The grid adjustable double-layer embolectomy support of claim 5, wherein a fixing ring is arranged at one end of the outer-layer embolectomy support, and the fixing ring is connected with the outer-layer embolectomy support through welding.

7. The grid adjustable double deck embolectomy support of claim 6, wherein the number of fixation loops corresponds to the number of straight hooks.

8. The grid adjustable double deck embolectomy support of claim 7, wherein the retaining ring is a circular ring structure, and the inner diameter of the retaining ring is similar to the inner diameter of the straight hook.

9. The grid adjustable double deck embolectomy support of claim 8, wherein the length of the straight section is one-half of the length of the first symmetric grid; the straight hook penetrates out of the fixing ring, and the maximum penetrating length is the length of the straight section.

10. The grid adjustable double layer embolectomy stent of claim 1, wherein the embolectomy stent is made of a memory alloy.