CN114010262B

CN114010262B - Intravascular thrombectomy device

Info

Publication number: CN114010262B
Application number: CN202111436242.1A
Authority: CN
Inventors: 钟志雄; 钟炜; 李存仁; 郑晓勇; 钟小彬
Original assignee: Shenzhen Maiteng Medical Technology Co ltd; Meizhou Peoples Hospital
Current assignee: Meizhou Peoples Hospital
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2025-08-26
Anticipated expiration: 2041-11-26
Also published as: CN114010262A

Abstract

The invention relates to the technical field of medical instruments, in particular to an intravascular thrombus taking device which comprises a sheath tube, an operating rod, a first dense net and a second dense net which are arranged on the operating rod, wherein the first dense net and the second dense net are of elastic umbrella-shaped structures which can be automatically unfolded in a natural state, the closed ends of the two dense nets are fixedly connected with the operating rod, the open ends are oppositely arranged, parts of the first dense net are inserted into the second dense net, the outer diameter of the second dense net is larger than that of the first dense net in an unfolded state, so that an annular inlet is formed at the overlapped part of the two dense nets, and the operating rod can axially move relative to the sheath tube, so that the first dense net and the second dense net can be pushed out of the sheath tube to be automatically unfolded or pulled into the sheath tube and contracted in the sheath tube. This intravascular thrombus taking device of this patent can not block the blood flow when taking the thrombus, only needs to make the relative sheath pipe of control lever remove just can realize expansion and the shrink of first close net and the close net of second, and then realizes collecting and parcel to the thrombus, and the thrombus is difficult to escape, structural design is ingenious, convenient to use.

Description

Intravascular thrombus taking device

Technical Field

The invention relates to the technical field of medical appliances, in particular to an intravascular thrombus taking device.

Background

At present, the treatment method of thrombus mainly comprises two modes of medicine thrombolysis and mechanical thrombolysis, and the medicine thrombolysis effect lasts long and has poor effect on massive thrombus. Therefore, mechanical thrombus taking is a hot spot of research in recent years, and the current mechanical thrombus taking mainly comprises the following methods of thrombus sucking, thrombus taking by a catcher and laser thrombus breaking. The thrombus taking device is characterized in that a thrombus taking balloon is used for contacting with the wall of a blood vessel to scrape and bring thrombus out of the body, and when the thrombus is taken, the balloon can block the blood flow of the blood vessel, so that the thrombus taking device has great influence on the human body. Therefore, a thrombus removing filter screen appears, and blood flow can not be blocked during thrombus removing, but most of the thrombus removing filter screens are thrombus removing filter screens at present, so that the thrombus escaping problem exists. There are also some thrombus removing devices using thrombus removing filter screens to avoid or reduce thrombus escape, but the structure is complex, the use is inconvenient, and the manufacturing and maintenance costs are high.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide the intravascular thrombus taking device which can not block blood flow during thrombus taking, can effectively avoid thrombus escaping, and has a simple and ingenious structure and is convenient to use.

The task of the invention is realized by the following technical scheme:

The utility model provides an intravascular thrombus taking device, including the sheath pipe, pass the action bars of sheath pipe, along the first dense mesh and the second dense mesh of axial setting on the action bars, the action bars is equipped with the mesopore that supplies the seal wire to pass along its axial, first dense mesh and second dense mesh are the elasticity umbrella-shaped structure that can automatic expansion under natural state, the blind end of first dense mesh and second dense mesh is fixed connection action bars, open end relative setting and the part of first dense mesh insert in the second dense mesh thereby can cooperate and form a thrombus cover, first dense mesh is located the distal end of second dense mesh, thereby the external diameter of second dense mesh is greater than the external diameter of first dense mesh under the expansion state so that second dense mesh and first dense mesh overlap department and form the inside annular entry of a intercommunication thrombus cover, the action bars can be relative sheath pipe axial displacement, thereby can release first dense mesh and second dense mesh and automatic expansion or draw and shrink in the sheath pipe.

As the preferable technical scheme, the first dense net and the second dense net are umbrella-shaped structures formed by connecting a conical section and a straight section in series, the closed end is positioned at the top end of the conical section, the open end is positioned at the free end of the straight section, the conical section and the straight section are integrally formed or fixedly connected, and the filter plug cover formed by matching the second dense net with the first dense net in an unfolding state is of a capsule-shaped structure.

As a preferable technical scheme, the first dense net and/or the second dense net are made of elastic metal net or mesh cover with elastic metal umbrella rib matched with the outer surface.

As a preferred embodiment, the intravascular thrombus removal device further comprises a guide wire passing through the middle hole of the control rod.

When the thrombus removing device is used, the first dense net and the second dense net on the operating rod are contracted in the sheath tube, then the operating rod in the sheath tube is guided by the guide wire to be sent to the appointed position in the blood vessel, then the operating rod is pushed to move towards the far end relative to the sheath tube, so that the first dense net and the second dense net are driven to be sequentially pushed out of the sheath tube, the first dense net and the second dense net are naturally unfolded and matched with each other to form a thrombus cover after being separated from the constraint of the sheath tube (the outer diameters of the first dense net and the second dense net after being unfolded are smaller than the inner diameter of the blood vessel, therefore scratches cannot be caused to the inner wall of the blood vessel), when blood flows, the thrombus can enter the two dense nets through the annular inlet at the overlapped part of the first dense net and the second dense net (namely the thrombus cover), when thrombus is required to be removed, the closed end of the second dense net is firstly abutted against the sheath tube and contracted under the extrusion of the sheath tube, and the open end of the second dense net is sleeved outside the open end of the first dense net, so that thrombus can be repeatedly removed by the first dense net, and the thrombus can be repeatedly removed from the inner sheath tube. The intravascular thrombus taking device is commonly used for intravenous thrombus taking, but can also be used for intraarterial thrombus taking.

Compared with the prior art, the intravascular thrombus taking device has the advantages that thrombus taking is carried out through the first dense net and the second dense net, blood flow can pass through the dense net, so that blood flow can not be blocked during thrombus taking, the first dense net and the second dense net are matched to form a thrombus filtering cover, thrombus entering the thrombus filtering cover is difficult to escape, the elastic automatic opening characteristic of the first dense net and the second dense net and the position of the first dense net are used for being inserted into the second dense net, the expansion and contraction of the first dense net and the second dense net can be realized only by moving an operating rod relative to a sheath tube, thrombus collecting and wrapping are realized, the thrombus taking device is simple in structure, ingenious in design, convenient and quick to use, and good in thrombus taking effect, and the thrombus filtering cover formed by the matching of the second dense net and the first dense net in a capsule-shaped structure in an expanded state can be increased, and the capsule-shaped structure is difficult to scratch the inner wall of a blood vessel.

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

Drawings

FIG. 1 is a schematic perspective view of an intravascular thrombus removal device of the present invention;

Fig. 2 is a schematic cross-sectional view of an intravascular thrombus removal device of the present invention.

Wherein, sheath tube 1, control rod 2, guide wire 3, first dense net 4, conical section 41, straight section 42, second dense net 5, annular inlet 6.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the description of the specific embodiments is intended for purposes of illustration only and is not intended to limit the scope of the present disclosure.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected through intervening elements.

As shown in fig. 1-2, an intravascular thrombus removing device comprises a sheath tube 1, an operating rod 2 penetrating through the sheath tube 1, a guide wire 3 penetrating through a hole in the operating rod 2, and a first dense net 4 and a second dense net 5 axially arranged on the operating rod 2, wherein the first dense net 4 and the second dense net 5 are of elastic umbrella-shaped structures capable of being automatically unfolded under natural conditions, the closed ends of the first dense net 4 and the second dense net 5 are fixedly connected with the operating rod 2, the open ends are sleeved outside the sheath tube 1 and are oppositely arranged, the open ends of the first dense net 4 are partially inserted into the open ends of the second dense net 5 so as to form a thrombus filtering cover in a matched mode, the first dense net 4 is positioned at the far end of the second dense net 5, the second dense net 5 is partially sleeved outside the first dense net 4, the outer diameter of the second dense net 5 is larger than the outer diameter of the first dense net 4 in an unfolding state, so that the second dense net 5 and the first dense net 4 are overlapped to form a communicated annular inlet 6, and the second dense net 5 can be automatically unfolded and pushed out of the sheath tube 1 or the sheath tube 1 and can be automatically unfolded and pushed out of the sheath tube 1.

In this embodiment, the first dense net 4 and the second dense net 5 are umbrella structures formed by connecting a conical section 41 and a straight section 42 in series, the closed end is located at the top end of the conical section 41, the open end is located at the free end of the straight section 42, the conical section 41 and the straight section 42 are integrally formed, and the filter plug cover formed by matching the second dense net 5 with the first dense net 4 in the unfolded state is of a capsule structure. In other embodiments, the first and/or second dense webs 4, 5 may take other forms of construction.

In this embodiment, the first dense net 4 and the second dense net 5 are made of metal net with elasticity. In other embodiments, the first dense net 4 and the second dense net 5 may also be made of a mesh cover covered by an elastic metal rib.

In addition, in other embodiments, the intravascular thrombus-taking device may not be provided with the guide wire 3, and the guide wires of other interventional treatment devices may be shared.

When in use, the first dense net 4 and the second dense net 5 on the control rod 2 are contracted in the sheath tube 1, then the control rod 2 in the sheath tube 1 and the control rod 2 is guided to a designated position in a blood vessel through the guide wire 3, then the control rod 2 is pushed to move towards the far end relative to the sheath tube 1, so that the first dense net 4 and the second dense net 5 are driven to sequentially push out the sheath tube 1, the first dense net 4 and the second dense net 5 are naturally expanded and matched to form a filter plug cover (the outer diameters of the expanded first dense net 4 and the expanded second dense net 5 are smaller than the inner diameter of the blood vessel, therefore scratches are not caused on the inner wall of the blood vessel), when blood flows, the blood flow can enter the inside of the two dense nets (namely the filter plug cover) through the annular inlet 6 at the overlapped part of the first dense net 4 and the second dense net 5, when the thrombus is required to be removed, the control rod 2 is dragged towards the near end relative to the sheath tube 1, the first dense net 4 and the second dense net 5 is abutted against the sheath tube 1, the thrombus is extruded at the second dense net 5 under the constraint of the sheath tube 1, the first dense net 4 is extruded to the inner side of the inner net 4, and the thrombus is simultaneously contracted at the inner side of the sheath tube 1, and the thrombus is removed by the first dense net 4 is repeatedly, and the thrombus is repeatedly removed at the inner side of the inner net 4 is simultaneously, and the thrombus is removed by the inner opening of the inner net 4 is repeatedly, and the thrombus is simultaneously contracted at the inner opening of the inner net 4 is simultaneously, and the inner and the thrombus is simultaneously is contracted at the inner and the inner tightly net 4 is opened. The intravascular thrombus taking device is commonly used for intravenous thrombus taking, but can also be used for intraarterial thrombus taking.

Compared with the prior art, the intravascular thrombus taking device has the advantages that thrombus taking is carried out through the first dense net 4 and the second dense net 5, blood flow can pass through the dense net, so that the blood flow can not be blocked during thrombus taking, the first dense net 4 and the second dense net 5 are matched to form a thrombus cover, thrombus entering the thrombus taking device is difficult to escape, the elastic automatic opening characteristic of the first dense net 4 and the second dense net 5 and the position of the second dense net 5 on the first dense net 4 are overlapped and sleeved, the expansion and the contraction of the first dense net 4 and the second dense net 5 can be realized only by moving the operating rod 2 relative to the sheath tube 1, thrombus collecting and wrapping are realized, the thrombus taking device is simple in structure, ingenious in design, convenient and quick to use, and good in thrombus taking effect, and the thrombus cover formed by the second dense net 5 and the first dense net 4 in a matched mode is of the first dense net 4 in a capsule-shaped structure by the conical section 41 and the straight section 42 in a series connection mode is easy to increase the volume of the capsule-shaped structure, and the capsule-shaped thrombus taking device is prevented from being scratched.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. An intravascular thrombus removal device, characterized in that it includes a sheath, a joystick passing through the sheath, a first dense net and a second dense net axially arranged on the joystick, the joystick is provided with a middle hole for a guide wire to pass through along its axial direction, the first dense net and the second dense net are both elastic umbrella-shaped structures that can be automatically unfolded in a natural state, the closed ends of the first dense net and the second dense net are fixedly connected to the joystick, the open ends are arranged opposite to each other and part of the first dense net is inserted into the second dense net so as to cooperate to form a filter cover, the first dense net is located at the distal end of the second dense net, and in the unfolded state, the outer diameter of the second dense net is larger than the outer diameter of the first dense net so that an annular entrance connected to the interior of the filter cover is formed at the overlapping part of the second dense net and the first dense net, and the joystick can be relative to the sheath axis. When the joystick is dragged toward the proximal end relative to the sheath, the closed end of the second dense mesh first abuts the sheath and shrinks under the pressure of the sheath. Since the open end of the second dense mesh is sleeved on the outside of the open end of the first dense mesh, it will squeeze the first dense mesh inward and drive the first dense mesh to shrink, so that the second dense mesh and the first dense mesh are both contracted and dragged into the sheath in sequence. The first dense mesh and/or the second dense mesh are made of a metal mesh with elasticity, or are made of a metal rib with elasticity and a mesh cover on the outside. The intravascular thrombus removal device also includes a guide wire, which passes through the middle hole of the joystick.

2. The intravascular thrombus removal device according to claim 1 is characterized in that the first dense mesh and the second dense mesh are both umbrella-shaped structures composed of a conical section and a straight section connected in series, the closed end is located at the top of the conical section, and the open end is located at the free end of the straight section, the conical section and the straight section are integrally formed or fixedly connected, and the filter cover formed by the second dense mesh and the first dense mesh in the expanded state is a capsule-shaped structure.