CN107212913B

CN107212913B - Support thrombectomy device with thrombus capture component

Info

Publication number: CN107212913B
Application number: CN201710298734.6A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenyang Mastech Medical Device Co ltd
Current assignee: Shenyang Mastech Medical Device Co ltd
Priority date: 2017-04-30
Filing date: 2017-04-30
Publication date: 2020-10-30
Anticipated expiration: 2037-04-30
Also published as: CN107212913A

Abstract

The invention relates to a stent embolectomy device with a thrombus capturing component, which adopts the technical scheme that: the stent embolectomy device is internally provided with a protective tube, a pushing wire is arranged in the protective tube, and the far end of the pushing wire is provided with a thrombus capture component. The thrombus capturing component is composed of a cylindrical net with a leading end, meshes of the cylindrical net are L-shaped, and a bent structure facing the inside of the cylindrical net is arranged at the joint of the two net wires. The invention has the advantages of improving the capability of capturing and fixing thrombus of the stent thrombus remover and preventing the thrombus from falling off and blocking a far-end blood vessel in the thrombus removing process. In addition, the stent embolectomy device is formed by laser cutting a single metal pipe, so that the overlapping of cylindrical net structures does not exist, and the stent embolectomy device has good flexibility.

Description

Support thrombectomy device with thrombus capture component

Technical Field

The invention relates to the field of medical instruments, in particular to a stent embolectomy device with a thrombus capture component, which can prevent thrombus from blocking a far-end blood vessel after falling off.

Background

Ischemic stroke is a disease caused by the narrowing or occlusion of an artery supplying blood to the brain, which can lead to the necrosis of brain tissue, and after it occurs, it is necessary to recanalize the blood vessel in the shortest time. The clinical treatment method for ischemic stroke caused by thrombus mainly comprises two methods, namely medicinal thrombolysis and mechanical thrombus removal. The mechanical thrombus removal is used as a novel thrombus treatment method, and is particularly suitable for patients with unsatisfactory thrombolytic effect or unsuitable thrombolytic treatment.

The stent thrombus is a new mechanical thrombus taking method, which is to send a stent thrombus taking device to a blood vessel embolism position through a catheter and release the stent thrombus, the stent thrombus taking device is automatically unfolded and is embedded with thrombus by means of self expansion force, and then the stent thrombus taking device is withdrawn to take out the thrombus with the assistance of medical imaging technology.

The Chinese patent CN103417257B discloses an intracranial vascular thrombus removal device, the distribution density of spiral net ring units of the thrombus removal device is different, the distribution at the far end is dense, the distribution at the near end is relatively sparse, and the thrombus can be effectively prevented from falling off. Chinese patent application CN103997976A discloses an embolectomy cage having an elongated axis and a circumference, comprising elongated members that collectively define a plurality of open cells, which is effective in removing emboli. Chinese patent CN105726088A discloses a thrombus extraction device, which comprises a reticular self-expanding stent and a core wire, wherein the stent is in a cylindrical expansion state, the proximal end of the stent is provided with an opening, and the distal end of the stent is closed. US2012/0245671a1 discloses an improved adherence vascular stent comprising a plurality of rows and a bridge rib between adjacent rows, the stent further comprising a tapered portion connected to a connection mechanism. The stent can be used as an embolectomy device, and when the stent is unfolded in thrombus, the overlapping part can provide the capability of capturing and retaining the thrombus and prevent the thrombus from falling off. The stent thrombus taking device or the thrombus taking device disclosed by the patent is formed by laser engraving of a metal pipe, the section shape of the middle equal-diameter part still keeps the hollow structure of the pipe, and the capability of fixing thrombus is limited.

The Chinese patent CN103417261B discloses an intracranial vascular thrombus removal device, wherein a certain number of barbs are arranged on the inner wall of a lumen of the thrombus removal device, so that thrombus can be fixed and can be prevented from falling off. The Chinese patent CN10400635A discloses an embolectomy device and an embolectomy device, wherein a plurality of three-dimensional concave rods extending into an inner cavity are arranged on a net structure, and the embolectomy device can improve the stability of embolectomy and prevent thrombus from falling off. The Chinese patent CN105662534A discloses a blood vessel thrombus taking device with thorn-shaped structures and a thrombus therapeutic apparatus thereof, wherein the thorn-shaped structures are respectively arranged on the ribs of the unit grids, and each thorn-shaped structure extends towards the cavity and can be used for bending the blood vessel or reaching the thin blood vessel at the far end. The support thrombectomy ware that above-mentioned patent discloses or the thrombectomy device still forms for metal tubular product laser sculpture, and has set up some barbs or protrudingly through structural design to the lumen inner wall slope, in order to play the effect of fixed thrombus, the barb that above-mentioned patent provided or protruding be all along thrombectomy ware axial direction setting, cross sectional area is less, the ability of fixed thrombus is limited, above-mentioned barb or protruding also have the risk of fish tail blood vessel inner wall at thrombectomy ware recovery in-process in addition.

US2016/0113665a1 discloses a clot retrieval device for removing an occluded clot from a blood vessel, the device comprising an inner elongate body having a compressed delivery configuration and an expanded deployed configuration, and an outer elongate body which can encase the inner elongate body, the device preventing clot or clot fragment from falling distally during embolectomy. However, the device is formed by carving, nesting and welding a plurality of layers of metal tubes, but is not formed by laser carving of a single metal tube, which can increase the outer diameter of the bolt extractor in a conveying state and reduce the flexibility of the bolt extractor.

As mentioned above, the current stent embolectomy device or embolectomy device is limited by the structure, the embedded part of the stent embolectomy device or embolectomy device and the thrombus is usually concentrated at the outer part of the thrombus, or only barbs or protrusions with small cross-sectional areas extend into the thrombus, the contact area with the inner part of the thrombus and the thrombus fixing capacity are very limited, when the thrombus is pulled, the force of the stent embolectomy device or embolectomy device acting on the thrombus is not uniform, the thrombus is easy to fall off from the embolectomy device, or thrombus fragments are generated to block the far-end blood vessel. In addition, although the stent embolectomy device or embolectomy device manufactured by processing a plurality of layers of metal tubes can effectively increase the contact area with thrombus, the problems of increased outer diameter and reduced flexibility in a conveying state are caused.

For the foregoing reasons, there is a need for an improved stent retriever that can efficiently capture and immobilize thrombus without thrombus fragments falling off the stent retriever and occluding the distal vessel, while having good compliance.

Disclosure of Invention

The invention aims to provide a stent embolectomy device with a thrombus capture component, which can prevent thrombus from blocking a far-end blood vessel after falling off.

In order to achieve the above object, the present invention is realized by:

the utility model provides a support thrombectomy ware with thrombus catches part, this support thrombectomy ware is provided with the protection tube, is provided with in the protection tube and pushes away the silk, pushes away the distal end that the silk was provided with thrombus and catches the part.

The thrombus capturing component is composed of a cylindrical net with a leading end, meshes of the cylindrical net are L-shaped, and a bent structure facing the inside of the cylindrical net is arranged at the joint of the two net wires.

The thrombus capture component is conical at two ends, a leading end is arranged at the far end, and a developing mark is arranged at the near end and fixed with the pushing wire. The leading end is provided with a developing metal coil or a polymer sheath containing developing materials which can be seen under X-rays, and the tail end of the leading end is hemispherical.

The thrombus capture component is of an integrally formed structure. The thrombus capture component is formed by laser cutting a nickel-titanium alloy tube and heat treatment shaping, and can be converted between a contraction state and a development state.

And a thrombus taking mesh wire communicated with the blood vessel is also arranged on the cylindrical mesh of the thrombus capture component.

According to the invention, the pushing wire comprises a constant diameter part and a reducing part, and the radius of the reducing part is gradually reduced from the proximal end to the distal end of the pushing wire. The distal end surface of the reducing part is wound with a metal coil.

The stent thrombus taking device with the thrombus capturing component improves the thrombus capturing and fixing capacity of the stent thrombus taking device on one hand, and prevents thrombus from falling off and blocking a far-end blood vessel in the thrombus taking process. On the other hand, the stent embolectomy device is formed by laser cutting and processing a single metal pipe, so that the overlapping of cylindrical net structures does not exist, and the stent embolectomy device has good flexibility.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view of the structure of FIG. 1 in a contracted state according to the present invention;

FIG. 3 is a schematic view of the construction of a thrombus capture member of the present invention;

FIG. 4 is a schematic cross-sectional view of FIG. 3;

fig. 5 is an expanded view of the structure of fig. 3.

Fig. 6 is a schematic structural view of the push wire.

Detailed Description

The bracket embolectomy device provided by the invention is shown in figures 1 and 2. The stent embolectomy device comprises a thrombus capturing component 1, a pushing wire 2 and a protection tube 3. The protecting tube 3 of the stent embolectomy device is internally provided with a pushing wire 2, and the far end of the pushing wire 2 is provided with a thrombus capturing component 1. The thrombus capture component 1 is in a contracted state when being positioned in the protective tube 3, and when the thrombus capture component 1 is moved out of the protective tube 3 by pushing the wire 2, the thrombus capture component 1 can be automatically unfolded to an unfolded state, and the thrombus capture component 1 can be freely switched between the contracted state and the unfolded state. The thrombus capture component 1 has a total length of 10-80 mm in a deployed state, an outer diameter of 1.5-6 mm, a mesh width of 0.05-0.08 mm, and a mesh thickness of 0.05-0.10 mm.

The thrombus-capturing member proposed in the present invention is shown in fig. 3 to 5. The thrombus capture member 1 is composed of a cylindrical net with a leading end 13, the meshes of the cylindrical net are L-shaped, and the joint of two net wires is provided with a bent structure 11 facing the inside of the cylindrical net.

The thrombus capture member 1 has two tapered ends, a distal end provided with a leading end 13, and a proximal end provided with a visualization mark 14 and fixed with the push wire 2. The leading end 13 is provided with a developing metal coil or a polymer sheath containing a developing material which can be seen under X-rays, and the tail end of the leading end is hemispherical. The developing metal coil may be made of gold, platinum, tungsten, platinum-iridium alloy, platinum-tungsten alloy, etc., and the polymer sheath containing the developing material may be made of polyurethane containing tungsten, polyether-amide elastomer containing tungsten blocks, etc. The stent embolectomy device proximal end development marker 14 can be made of gold, platinum, tungsten, platinum-iridium alloy, platinum-tungsten alloy and the like.

The thrombus capture component 1 is an integrally formed structure and is formed by cutting a nickel-titanium alloy pipe by laser, and the bent structure 11 is formed by heat treatment after the shape of the thrombus capture component 1 is restrained by a specific mould.

The cylindrical net of the thrombus capture component 1 is also provided with a thrombus taking net wire 12 which is communicated with the blood vessel. The thrombus taking mesh wires 12 and the bending structures 11 which are communicated with the blood vessel are spirally distributed along the axial direction at intervals, so that the thrombus capture component 1 can be ensured to be bent into the cylindrical mesh only locally, and the cross section of the cylindrical mesh is still maintained at other parts.

The push wire proposed in the present invention is shown in fig. 6. The push wire comprises a constant diameter part 21 and a reducing part 22, and the radius of the reducing part 22 is gradually reduced from the proximal end of the push wire to the distal end. The distal end surface of the reducing portion 22 is wound with a metal coil 23, and the material of the metal coil 23 may be gold, platinum, tungsten, platinum-iridium alloy, platinum-tungsten alloy, 304 stainless steel, 316L stainless steel, and the like. The push wire has a total length of 170-200 cm and the constant diameter portion 21 has an outer diameter of 0.3-0.5 mm.

The "distal end" refers to the end of the instrument distal from the operator, and the "proximal end" refers to the end of the instrument proximal to the operator.

Claims

1. The utility model provides a support thrombectomy ware with thrombus capture component which characterized by: the stent embolectomy device is provided with a protective tube which is matched with the micro catheter, a pushing wire is arranged in the protective tube, and a thrombus capturing component is arranged at the far end of the pushing wire; the thrombus capturing component is composed of cylindrical nets with leading ends, meshes of the cylindrical nets are L-shaped, a bent capturing bolt structure facing the insides of the cylindrical nets is arranged at the connection position of net wires of the two cylindrical nets, the thrombus capturing component is of an integrally formed structure, and after the shape of the thrombus capturing component is restrained by a die, the shape is shaped by heat treatment; the two ends of the thrombus capture component are conical, the far end is provided with a leading end, and the near end is provided with a developing mark and fixed with the push wire; the leading end is provided with a developing metal coil visible under X-rays or a polymer sheath containing developing materials; the cylindrical net of the thrombus capture component consists of thrombus taking net wires in the diameter corresponding to the inner wall of the blood vessel, and the thrombus taking net wires in the diameter corresponding to the inner wall of the blood vessel and the bent thrombus capture structures are spirally distributed at intervals along the axial direction.

2. The stent embolectomy device of claim 1, wherein: the thrombus capture component is of an integrally formed structure.