CN113925568A

CN113925568A - Thrombus taking device

Info

Publication number: CN113925568A
Application number: CN202111215575.1A
Authority: CN
Inventors: 夏顺; 黄定国
Original assignee: Shanghai Tendfo Medical Technologies Co Ltd
Current assignee: Shanghai Tendfo Medical Technologies Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-14

Abstract

The invention provides a thrombus removal device. It includes: an expandable and contractible net bag component and a conveying component; the net bag component comprises at least one net bag unit; when the net bag assembly comprises a plurality of net bag units, the plurality of net bag units are arranged at intervals along the axial direction; each string bag unit respectively includes: a net bag main body and a plurality of pull rods; the net bag main body is of a flat net bag structure with a closed far end, and the far ends of the pull rods are respectively connected with the near end of the net bag main body; the far end of the net bag unit is connected with the conveying component, the near ends of a plurality of pull rods of the net bag unit are converged and connected with the conveying component, and openings of the net bag unit are formed among the pull rods; the conveying assembly is used for accommodating the net bag assembly in a compressed state and releasing the net bag assembly to an expanded state and pulling the net bag assembly in the expanded state back into the conduit. According to the embodiment of the invention, thrombus can be taken out through the net bag structure, the success rate of one-time thrombus taking can be improved, and the thrombus can be effectively prevented from escaping in the thrombus taking process.

Description

Thrombus taking device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a thrombus removal device.

Background

Intravascular thrombosis is a very wide-ranging systemic disease that can affect the upper limbs, lower limbs, visceral vessels, and carotid arteries. When thrombus occurs in the heart, myocardial infarction can occur; occurring in the brain, can cause cerebral infarction; occurring in the lung, it causes pulmonary embolism … …, and the death due to thrombotic diseases accounts for 51% of the death worldwide, far exceeding the death caused by tumors, infectious diseases, respiratory diseases, etc.

The current major treatment of thrombosis includes: anticoagulant medication, interventional therapy and surgery. For patients with mild symptoms, conservative treatment with anticoagulant drugs can be used; for patients who cannot be treated with the drug, necessary surgery must be performed. Compared with surgical operation, the interventional therapy has small trauma and quick recovery and is easier to be accepted by patients. Interventional treatment is more limited in effectiveness by the interventional instrument.

The inventor finds that: due to the diversity of the diseased parts of the thrombus disease and the complexity of the thrombus form, the existing thrombus taking instruments, such as thrombus taking brackets, suction catheters and the like, generally have the problems that the thrombus is difficult to be completely removed, the success rate of one-time thrombus taking is low, and the fragmented thrombus is easy to escape to block the branch at the far end.

Disclosure of Invention

The embodiment of the invention aims to provide a thrombus taking device, which solves the problems of low success rate of one-time thrombus taking and easy omission of fragmented thrombus.

In order to solve the above technical problem, an embodiment of the present invention provides a thrombus removal device, including:

an expandable and contractible net bag assembly, the net bag assembly comprising at least one net bag unit; when the net bag assembly comprises a plurality of net bag units, the net bag units are arranged at intervals along the axial direction; each string bag unit respectively includes: a net bag main body and a plurality of pull rods; the net bag main body is of a flat net bag structure with a closed far end, and the far ends of the pull rods are respectively connected with the near end of the net bag main body; and

the far end of the net bag unit is connected with the conveying component, the near ends of a plurality of pull rods of the net bag unit converge and are connected with the conveying component, and an opening of the net bag unit is formed among the pull rods; the conveying assembly is used for accommodating the net bag assembly in a compressed state and releasing the net bag assembly to an expanded state and pulling the net bag assembly in the expanded state back into the conduit.

In addition, the string bag subassembly includes a plurality of string bag units, just a plurality of string bag units weave the shaping by many the integrative crisscross weaves of weaving silk.

In addition, each pull rod of the net bag unit is of a twist rod structure formed by combining the weaving wires and weaving the weaving wires.

In addition, the net bag main body comprises a supporting section of a circumferential closed loop and a far-end filter screen smoothly connected with the far end of the supporting section; the mesh density of the support section is less than that of the far-end filter screen; a plurality of pull rods of the net bag unit are uniformly arranged at intervals along the circumferential direction and form a conical structure.

In addition, the core pipe comprises an elastic telescopic section and a rigid section, wherein the elastic telescopic section is arranged between the far end and the near end of the net bag assembly in a penetrating mode, and the rigid section is connected with the near end of the elastic telescopic section.

In addition, the ratio of the axial length of the pull rod of the string bag unit to the axial length of the string bag body is greater than or equal to 0.5 and less than or equal to 5, and the ratio of the maximum diameter of the string bag body to the axial length of the string bag body may be greater than or equal to 2 and less than or equal to 20.

In addition, the embolectomy device comprises a plurality of net bag units, and each net bag unit is formed by weaving a plurality of weaving wires in a staggered mode.

Additionally, the delivery assembly includes a core tube; the net bag component also comprises a near-end developing fixing ring;

the core pipe wears to locate a plurality of string bag units, the distal end of a plurality of string bag units with the core pipe links to each other, and many weaving silks between two adjacent string bag units are woven into and are connected the network management, it locates to connect the network management cover the core pipe, in a plurality of string bag units a plurality of pull rods of the string bag unit of near-end converge and with the solid fixed ring of near-end development links to each other, the solid fixed cover of the solid fixed ring of near-end development is located the core pipe.

In addition, the delivery assembly further comprises:

the operating handle is of a hollow tubular structure, and the peripheral wall of the operating handle is provided with a sliding groove extending along the axial direction of the operating handle;

the proximal end of the sheath tube is movably arranged on the operating handle in a penetrating way and is used for accommodating the net bag component in a contraction state;

the sheath tube connecting piece is of a tubular structure and is arranged on the far end side in the operating handle, and the far end of the sheath tube connecting piece is connected with the near end of the sheath tube; the core tube penetrates through the sheath tube and the sheath tube connecting piece, is hermetically connected with the near end of the sheath tube connecting piece and can axially move relative to the sheath tube and the sheath tube connecting piece; the near end of the core pipe penetrates out of and is fixedly arranged at the near end of the operating handle; and

the driving piece is arranged in the sliding groove, the inner end part of the driving piece is connected with the sheath pipe connecting piece and can drive the sheath pipe connecting piece to drive the sheath pipe to move towards the near end in the operating handle along the sliding groove so as to release the net bag assembly.

In addition, the operating handle comprises a first shell and a second shell which are clamped with each other;

the first shell and the second shell are both provided with positioning columns and positioning holes; the positioning column is matched with the positioning hole, so that the first shell and the second shell are aligned and clamped.

According to the technical scheme, the invention has at least the following advantages and positive effects:

the net bag component of the thrombus taking device provided by the embodiment of the invention can comprise one or more net bag units, wherein the net bag units are axially arranged at intervals, the net bag main body of each net bag unit adopts a flat net bag structure with a closed far end, and the near end of the net bag main body is provided with a plurality of pull rods which are converged and connected to the conveying component, so that each net bag unit not only has a large opening to facilitate thrombus to enter the net bag main body, but also can select the thrombus taking device with a proper number of net bag units according to the length of the thrombus to take the thrombus in a segmented manner and completely out.

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 introduced below, it is understood that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a thrombus removal device according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a string bag assembly of the embolectomy device according to an embodiment of the present invention;

FIG. 3 is a schematic view of a string bag assembly of the embolectomy device according to an embodiment of the present invention;

FIG. 4 is a schematic view illustrating a weaving structure of a pull rod of a string bag unit of the embolectomy device according to an embodiment of the present invention;

fig. 5a and 5b are schematic diagrams respectively illustrating a weaving structure of a string bag unit of a embolectomy device according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a thrombus removal device according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a delivery assembly of a thrombus removal device according to an embodiment of the present invention;

FIG. 8 is an exploded view of a delivery assembly of the embolectomy device provided in the embodiments of the present invention;

FIG. 9 is a schematic view of a connection structure of a sheath tube and a core tube of a delivery assembly of the embolectomy device provided by the embodiment of the invention;

FIG. 10 is a schematic view of a partial structure of a embolectomy device with a compressed string bag assembly according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a string bag assembly in a released state according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the description of the present application, various terms indicating orientation or positional relationship such as "center", "upper", "lower", "inner", "outer", etc. are used for convenience of description only based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, or be operated, and thus, should not be construed as limiting the present application.

It should be noted that, unless expressly stated otherwise, the terms "connected," "connected," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

Unless otherwise stated, reference to proximal and distal ends in the present invention shall have the same meaning in the orientation, i.e. in the use position, the distal end is the end distal from the operator, the proximal end is the end proximal to the operator, and the operator controls the access device at the proximal end.

Referring to fig. 1 to 3, an embodiment of the present invention provides an embolectomy device, which is suitable for removing thrombus in a blood vessel, especially suitable for rapidly removing thrombus with large thrombus amount. As shown in fig. 1 to 3, the embolectomy device of the present embodiment mainly includes: an expandable and contractible net bag component and a conveying component connected with the net bag component.

The net bag component comprises at least one net bag unit 1. The net bag unit 1 is an expandable and contractible thrombus taking structure, and can hold the thrombus from the distal end of the thrombus and pull the thrombus out of the body. The expansion performance of the string bag unit 1 can be formed by using a shape memory material.

The net bag component can comprise a net bag unit 1 which is suitable for removing a small amount of thrombus. The string bag subassembly can also include a plurality of string bag units 1, and when the string bag subassembly included a plurality of string bag units 1, a plurality of string bag units 1 were arranged along axial interval, and each string bag unit 1 can be taken the thrombus out of the body by the segmentation this moment, and the quantity of string bag unit 1 can be according to thrombus length and each string bag unit get bolt length etc. and confirm to realize clearing away fast of a large amount of thrombus.

Each string bag unit 1 includes: a string bag body 11 and a plurality of pull rods 12. The string bag main part 11 is the closed flat string bag structure of distal end, and the distal end of a plurality of pull rods 12 links to each other with string bag main part 11 near-end respectively. The distal end of string bag unit 1 links to each other with conveyor components, and a plurality of pull rod 12 near-end convergence of string bag unit 1 and link to each other with conveyor components, forms the opening of string bag unit 1 between a plurality of pull rod 12. The conveying assembly is also used for accommodating the net bag assembly in a compressed state and releasing the net bag assembly to an expanded state and pulling the net bag assembly in the expanded state back into the conduit.

As shown in fig. 11, when the string bag assembly is released to the thrombus taking position in the blood vessel, the string bag main body 11 of the string bag unit 1 can expand, the peripheral wall of the string bag main body 11 can be attached to the inner wall of the blood vessel, thrombus can enter the string bag main body 11 through the opening between the pull rods 12 and be taken in by the string bag main body 11, and the thrombus can be taken out of the body by withdrawing the string bag assembly and the thrombus into the catheter 100 through the conveying assembly.

Alternatively, the plurality of rods 12 of each string bag unit 1 are uniformly spaced in the circumferential direction and form a tapered structure, so that the string bag body 11 is uniformly stressed, and the string bag body 11 is conveniently received in the guide tube 100.

Each of the net bag units 1 can take out thrombus within a length of a blood vessel, which may be a length of the blood vessel between a proximal end side at a maximum diameter of the net bag unit 1 and a distal end of the catheter, or a length of the blood vessel between a maximum diameter of the net bag unit 1 at a distal end side and a maximum diameter of the net bag unit 1 at a proximal end side among the adjacent net bag units 1. In this embodiment, the string bag assembly may include 2 string bag units, and it can be understood that the number of the string bag units 1 may be more, for example, 4, so as to meet the requirement of embolectomy in a longer blood vessel length.

String bag unit 1's string bag main part 11 is used for pulling out the thrombus in the vascular length that its was responsible for along the blood vessel inner wall, when string bag main part 11 is ellipsoidal flat structure, not only can provide good support performance, and can make string bag main part 11 have great opening, the thrombus of being convenient for gets into in string bag main part 1 and live by the pocket, a plurality of pull rods 12 of string bag unit 1 are used for pulling string bag main part 11, simultaneously through the axial length of adjustment pull rod 12, the tapering of a plurality of pull rods promptly, can control string bag main part 11 to withdraw in the pipe better. Alternatively, the ratio of the axial length of the pull rod 12 of the string bag unit 1 to the axial length of the string bag body 11 may be greater than or equal to 0.5 and less than or equal to 5, and the ratio of the maximum diameter of the string bag body 11 to the axial length of the string bag body 11 may be greater than or equal to 2 and less than or equal to 20, so that the string bag unit is in a flat umbrella or onion shape as a whole, and thus the string bag unit has better embolectomy performance.

The plurality of net bag units 1 can be integrally formed by weaving a plurality of weaving wires in a staggered mode. The interlaced knitting yarns form meshes, and the meshes can be in regular polygonal structures such as rhombus and rectangle. The number of the braided wires can be even. The braided wires may be shape memory wires, such as nitinol wires. Or the shape memory metal wire and the polymer wire are woven together.

Referring to fig. 5a, the mesh density of the peripheral wall of the string bag main body 11 may be the same. As an alternative, the density of the mesh on the peripheral wall of the main string bag body 11 may be varied, and referring to FIG. 5b, the density of the mesh on the distal side of the main string bag body 11 is less than the density of the mesh on the proximal side of the main string bag body 11. Further, the string bag main body 11 comprises a support section 111 of a circumferential closed loop and a far-end filter screen 112 smoothly connected with the far end of the support section 111, and the mesh density of the support section 111 can be smaller than that of the far-end filter screen 112, so that the string bag main body has better adherence performance and better thrombus omission prevention. It should be noted that the proximal side of the supporting section 111 of the tuck net body 11 can be continuously woven into a tuck net closing section, and the distal ends of the plurality of pull rods 12 are respectively connected with the proximal end of the tuck net closing section.

Referring to fig. 4, each of the rods 12 of the string bag unit 1 may be a twist rod structure woven by combining a plurality of woven yarns, and the number of the rods of the string bag unit may be determined according to the difficulty of the weaving process and the retraction performance, for example, the number of the rods 12 of each string bag unit may be 3 or 4. When weaving, can use the even number root earlier to compile and weave the string bag major structure that the string bag unit was woven out to the silk, compile the even number root of string bag main part again and evenly merge the winding into the fried dough twist rod structure, when needs continue to weave out next string bag unit, scatter the silk of weaving of fried dough twist rod structure again and open, carry out the weaving of next string bag unit then.

Referring to fig. 7 to 9, the conveying assembly may include: core tube 2, guide head 3, operating handle 5, sheath pipe 4, sheath pipe connecting piece 6 and driving piece 7. The string bag assembly may further include a proximal development fixing ring 13. Referring to fig. 6, when the string bag assembly includes 1 string bag unit, the core tube 2 penetrates through the one string bag unit 1, and the distal end of the string bag unit 1 is connected to the core tube 2, the proximal ends of the pull rods 12 are converged and connected to the proximal developing fixing ring 13, and the proximal developing fixing ring 13 is fixedly sleeved on the core tube 2. Referring to fig. 1, when the string bag assembly includes a plurality of string bag units 1, the plurality of string bag units 2 are spaced apart from each other in the axial direction and are integrally connected to each other. The core pipe 2 wears to locate a plurality of string bag units 1, and the distal end of a plurality of string bag units 1 links to each other with core pipe 2, and many the weaving silks between two adjacent string bag units 1 are woven into and are connected the network pipe 14, and the core pipe 2 is located to connecting the network pipe 14 cover, and a plurality of pull rods 12 of the string bag unit 1 of near-end in a plurality of string bag units 1 converge and link to each other with the solid fixed ring 13 of development, and the core pipe 2 is located to the solid fixed ring 13 fixed cover of near-end development. Exemplarily, the string bag subassembly can include 2

string bag units

1, and 2 string bag units 1 are worn to locate in proper order by core pipe 2, and the string bag unit 1 distal end of the most distal end links to each other with core pipe 2, links to each other through connecting network pipe 14 between 2 string bag units 1, and a plurality of pull rods 12 near-end of the string bag unit 1 of near-end assemble and connect the solid fixed ring 13 of near-end development, and the solid fixed ring 13 fixed cover of near-end development is located core pipe 2.

It should be noted that each tuck net unit 1 in the plurality of tuck net units can be formed by interlacing and weaving a plurality of weaving wires, and then the tuck net units are connected with the core pipe 2, and the weaving wires between the adjacent tuck net units can be connected with the core pipe 2 through the developing fixing ring.

It is worth mentioning that the core tube 2 may include an elastic expansion section penetrating the string bag assembly and a rigid section connected to a proximal end of the elastic expansion section. The length of the elastic expansion section can be determined according to the elasticity of the material and the required expansion range. The flexible section of elasticity of core pipe 2 can be flexible along with string bag subassembly axial to usable string bag subassembly axial extension then radial compression, axial shorten then radial expanding's characteristic accept and release the string bag subassembly, not only easily accomodate and release, the expansion form non-deformable of string bag subassembly moreover. The material of construction of the elastically flexible section of the core tube 2 includes, but is not limited to: pebax (nylon Elastomer), TPU (ThermoPlastic polyurethane elastomers), TPE (ThermoPlastic Elastomer), or silicone. The proximal end of the elastically flexible section of the core tube 2 may be connected to the rigid section by heat welding or other physical connection means. It will be appreciated that the core tube 2 as a whole may also be of rigid construction.

The guide head 3 is connected with the far end of the core tube 2, the far end of the guide head 3 is a tip, and a conical head structure can be adopted, so that the propelling capability of the thrombus removal device in a blood vessel is improved.

The operating handle 5 is of a hollow tubular structure and its peripheral wall is provided with a sliding groove extending in its own axial direction. The proximal end of the sheath tube 4 is movably arranged through the operating handle 5. Sheath pipe connecting piece 6 is tubular structure and sets up in the inside distal end side of operating handle 5, and 6 distal ends of sheath pipe connecting piece link to each other with sheath pipe 4 near-end. The core tube 2 is arranged in the sheath tube 4 and the sheath tube connecting piece 6 in a penetrating way and is connected with the near end of the sheath tube connecting piece 6 in a sealing way, and can move axially relative to the sheath tube 4 and the sheath tube connecting piece 6. The near end of the core tube 2 penetrates out and is fixedly arranged at the near end of the operating handle 5. Driving piece 7 sets up in the spout, and the tip links to each other with sheath pipe connecting piece 6 in driving piece 7, and outside the spout was exposed to driving piece 7 outer end, driving piece 7 can drive sheath pipe connecting piece 6 and drive sheath pipe 4 and move to the near-end along the spout in operating handle 5 to release string bag subassembly. Namely, the driving piece 7 can drive the sheath tube 4 to axially slide relative to the core tube 2 in the operating handle 5.

The operating handle 5 can be designed into a shape and size suitable for holding, the driving piece 7 can be designed into a shape and size suitable for finger operation, and by holding the operating handle 5, the driving piece 7 can be pulled back to drive the sheath tube 4 to move towards the near end in the operating handle 5 along the sliding groove so as to release the net bag component to the expansion state and facilitate the operation of bolt taking. It will be appreciated that the sheath connector 6 and the operating handle 5 may be frictionally locked or locked by other locking means to prevent unintended movement of the sheath 4.

With continued reference to fig. 8, the operating handle 5 may include a first housing 51 and a second housing 52 that are snap-fit together.

The first housing 51 and the second housing 52 are provided with positioning posts and positioning holes, which cooperate to align and clamp the first housing 51 and the second housing 52. For example, the second housing 52 is provided with positioning posts 522 and positioning holes 521, and correspondingly, the first housing 51 is provided with corresponding positioning holes and positioning posts, and the first housing 51 and the second housing 52 can be aligned and clamped through their respective positioning posts and positioning holes. It is understood that the first housing 51 and the second housing 52 may be aligned and clamped by other positioning structures, and are not limited in this regard.

Optionally, a plurality of criss-cross reinforcing ribs 523 are disposed on the inner wall of the first housing 51 and/or the second housing 52 to improve the overall strength of the operating handle 5 and better meet the operating requirements.

Referring to fig. 8, the conveying assembly may further include: and the O-shaped sealing ring 61 is arranged between the inner wall of the near end of the sheath tube connecting piece 6 and the outer wall of the core tube 2. The sheath tube connecting piece 6 and the core tube 2 are hermetically connected through an O-shaped sealing ring 61. Namely, the near ends of the core tube 2 and the sheath tube connecting piece 6 are in sealed sliding connection, thereby not only ensuring the flexibility of the withdrawal operation of the sheath tube 4, but also preventing the blood from leaking out in the operation.

Illustratively, the driving member 7 may comprise two operating buttons symmetrically arranged on the sheath connector 6, and correspondingly, the sliding grooves are symmetrically arranged on the peripheral wall of the operating handle 5. Each of the operation buttons may include a link 71 and an operation portion 72. The connecting rod 72 is located in the sliding groove and can move along the sliding groove, one end of the connecting rod 72 is connected with the sheath tube connecting piece 61, and the other end is connected with the operation part 71. The link 72 is movable in the slide groove, and the operation portion 71 is located outside the slide groove. Specifically, the operation portion 71 may be formed by bending a belt-shaped or sheet-shaped structure into a structure with a substantially triangular cross section, wherein a side wall of the operation portion 71 parallel to the sliding groove is connected to an outer end of the connecting rod 72, and the other two side walls of the operation portion 71 may be used as operation surfaces for finger operation to drive the sheath connecting member 6 to move axially in the operation handle 5.

Optionally, the operation portion 71 is further provided with anti-slip stripes 73 to prevent fingers from slipping during operation.

Illustratively, the operating handle 5 is substantially chamfered rectangular in cross section. Wherein, the spout symmetry sets up in two parallel lateral walls each other of operating handle 5. The operating handle 5 is also provided with scale marks for indicating the axial movement distance of the sheath tube 4 along the operating handle 5. The scale marks can be arranged on the two symmetrical long rectangular side wall surfaces of the operating handle 5, so that the distance of the sheath tube 4 retreating (namely moving towards the near end) can be observed from any side of the operating handle 5 in operation, and an operator can control the release condition of the net bag assembly. It is to be understood that the scale lines may be provided only on one side surface of the operating handle 5, and are not particularly limited herein. The length of the sliding groove is the range within which the sheath tube 4 can move relative to the core tube 2.

The delivery assembly may further comprise: a stress diffusion sleeve 53 sleeved on the sheath tube 4 and fixedly arranged at the near end of the operating handle 5. The stress diffusion sleeve 13 serves to prevent the sheath 4 from being broken during the advancing process. Specifically, the distal end of the stress diffusion sleeve 13 is formed with an annular boss, the inner wall of the proximal end of the operating handle 5 is provided with an annular groove, and the annular boss is matched with the annular groove, so that the stress diffusion sleeve 13 is fixedly arranged on the operating handle 5. The stress diffusion sleeve 13 can be made of silica gel.

Optionally, the delivery device may further include tubing, a first luer fitting 8 and a second luer fitting 9. One end of the transfusion tube is connected with the peripheral wall of the sheath tube connecting piece 6 and is communicated with the gap between the sheath tube 4 and the core tube 2. The other end of the transfusion tube is connected with a first luer connector 8. By way of example and not limitation, the infusion tube may move within the chute, i.e., the infusion tube and the drive member are located within the same chute. The second luer connector 9 is connected with the proximal end of the core tube 2, and the distal end of the second luer connector 9 is fixedly connected with the proximal end of the operating handle 5, so that the proximal end of the core tube 2 is fixed on the sheath tube connecting piece 6. The first luer fitting 8 and the second luer fitting 9 may each be single or multiple luer fittings. Physiological saline can be injected into the gap between the sheath tube 4 and the core tube 2 through the first luer 8 and the infusion tube to exhaust air in the gap between the sheath tube 4 and the core tube 2. Physiological saline can be injected into the core tube 2 through the second luer 9 to exhaust air in the core tube 2. Of course, the infusion tube and the core tube 2 may be filled with thrombolytic agents or other functional liquids, and the infusion tube and the core tube are not particularly limited.

The method of using the embolectomy device of the embodiment with reference to fig. 1, 10 and 11 is as follows:

the thrombus removal device of the embodiment can be used with the catheter 100, and before the operation, saline is respectively injected into the first luer connector 8 and the second luer connector 9 through the syringes, and the air in the sheath tube 4 and the core tube 2 is exhausted. After advancing pipe 100 along the seal wire of implanting in advance to target in place earlier, will be equipped with the whole sheath pipe 4 that penetrates pipe 100 along the seal wire of string bag subassembly again and advance to get the bolt position, then the operation driving piece pulls back sheath pipe 4, and the string bag subassembly is released this moment, can judge the release degree of string bag subassembly through the scale mark on operating handle 5, treat after string bag subassembly releases completely again whole withdrawal operating handle 5 with string bag subassembly and thrombus withdraw in pipe 100 and take out of the body.

Based on the technical scheme, the invention at least has the following advantages and positive effects:

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A thrombectomy device, comprising:

2. The embolectomy device of claim 1, wherein the string bag assembly comprises a plurality of string bag units, and the plurality of string bag units are integrally formed by interweaving a plurality of braided filaments.

3. The embolectomy device of claim 2, wherein each pull rod of the string bag unit is a twist rod structure woven by combining the plurality of woven wires.

4. The embolectomy device of claim 1, wherein the tuck net body comprises a support section of a circumferential closed loop and a distal filter screen smoothly connected with the distal end of the support section; the mesh density of the support section is less than that of the far-end filter screen; a plurality of pull rods of the net bag unit are uniformly arranged at intervals along the circumferential direction and form a conical structure.

5. The embolectomy device of claim 1, wherein the core tube comprises an elastically stretchable section extending through the string bag assembly and a rigid section connected to a proximal end of the elastically stretchable section.

6. The embolectomy device of claim 1, wherein a ratio of an axial length of the drawbar of the string bag unit to an axial length of the string bag body is greater than or equal to 0.5 and less than or equal to 5, and a ratio of a maximum diameter of the string bag body to the axial length of the string bag body may be greater than or equal to 2 and less than or equal to 20.

7. The embolectomy device of claim 1, wherein the embolectomy device comprises a plurality of string bag units, and each string bag unit is formed by interweaving a plurality of knitting yarns.

8. The embolectomy device of claim 2, wherein the delivery assembly comprises a core tube; the net bag component also comprises a near-end developing fixing ring;

9. The embolectomy device of claim 2, wherein the delivery assembly further comprises:

10. The embolectomy device of claim 9, wherein the operating handle comprises a first shell and a second shell which are clamped together;