CN114010262A

CN114010262A - Intravascular thrombus removal device

Info

Publication number: CN114010262A
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: 2022-02-08

Abstract

The invention relates to the technical field of medical instruments, in particular to an intravascular thrombus removal device, which comprises a sheath tube, an operating rod, a first dense net and a second dense net, wherein the first dense net and the second dense net are arranged on the operating rod, the first dense net and the second dense net are 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, the part of the first dense net is 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 first dense net and the second dense net, 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 in and contracted in the sheath tube. The intravascular thrombus taking device of the patent can not block blood flow during thrombus taking, only needs to enable the control lever to move relative to the sheath tube to realize expansion and contraction of the first dense net and the second dense net, and further realizes collection and wrapping of thrombus, so that the thrombus can hardly escape, and the intravascular thrombus taking device is ingenious in structural design and convenient and fast to use.

Description

Intravascular thrombus removal device

Technical Field

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

Background

At present, the treatment method of thrombus mainly comprises two modes of drug thrombolysis and mechanical thrombus extraction, and the drug thrombolysis effect has long duration and poor effect on massive thrombus. Therefore, mechanical embolectomy is a hot spot of research in recent years, and at present, mechanical embolectomy mainly includes the following methods: sucking thrombus, taking thrombus by a catcher, and crushing thrombus by laser. The thrombus is scraped and taken out of the body by using the thrombus taking saccule to contact with the vessel wall, and the influence on the human body is large because the saccule can block the blood flow of the vessel during thrombus taking. Therefore, the thrombus taking filter screen is formed, and the blood flow cannot be blocked during thrombus taking, but most thrombus taking filter screens are thrombus taking filter screens at present, so that the thrombus escapes. At present, thrombus taking devices adopting thrombus taking filter screens are also available to avoid or reduce thrombus escape, but the thrombus taking devices are complex in structure, inconvenient to use and high in manufacturing and maintenance cost.

Disclosure of Invention

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

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

an intravascular thrombus taking device comprises a sheath tube, an operating rod penetrating through the sheath tube, a first dense net and a second dense net which are axially arranged on the operating rod, wherein the operating rod is axially provided with a middle hole for a guide wire to penetrate through, the first dense net and the second dense net are elastic umbrella-shaped structures which can be automatically unfolded in a natural state, the closed ends of the first dense net and the second dense net are fixedly connected with the operating rod, the open ends are oppositely arranged, the part of the first dense net is inserted into the second dense net so as to be matched with the second dense net to form a thrombus filtering cover, the first dense net is positioned at the far end of the second dense net, the outer diameter of the second dense net is larger than the outer diameter of the first dense net in an unfolding state, so that an annular inlet communicated with the inside of the thrombus filtering cover is formed at the overlapping position of the second dense net and the first dense net, and the operating rod can axially move relative to the sheath tube, thereby the first dense net and the second dense net can be pushed out of the sheath tube and automatically expanded or pulled in and contracted in the sheath tube.

As a preferred technical scheme, the first dense net and the second dense net are both umbrella-shaped structures formed by serially connecting a conical section and a straight cylinder section, 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 cylinder section, the conical section and the straight cylinder section are integrally formed or fixedly connected, and the filter plug cover formed by matching the second dense net and the first dense net in an unfolded state is of a capsule-shaped structure.

Preferably, the first dense mesh and/or the second dense mesh are made of an elastic metal mesh, or made of a mesh cover with elastic metal ribs fitted to the outside.

As a preferred technical solution, the intravascular embolectomy device further comprises a guide wire, wherein the guide wire passes through the central hole of the control rod.

When in use, the first dense net and the second dense net on the control rod are firstly contracted in the sheath tube, then the sheath tube and the control rod in the sheath tube are sent to a specified position in a blood vessel by guide wires, then the control rod is pushed to move towards a far end relative to the sheath tube so as to drive the first dense net and the second dense net to sequentially push out the sheath tube, the first dense net and the second dense net can be naturally expanded and matched to form a filter plug cover after being separated from the constraint of the sheath tube (the outer diameters of the expanded first dense net and the expanded second dense net are both smaller than the inner diameter of the blood vessel, so that the inner wall of the blood vessel can not be scratched), when blood flows through, the blood flows into the interiors of the two dense nets (namely the filter plug cover) through a ring-shaped inlet at the overlapped part of the first dense net and the second dense net, when thrombus needs to be taken out, the control rod drags the sheath tube to move towards the near end, the closed end of the second dense net is firstly contracted under the extrusion of the sheath tube, because the open end cover of the dense net of second is in the open end outside of first dense net, consequently can extrude first dense net inwards and then drive first dense net and also contract simultaneously to make the dense net of second and first dense net all contract and the cooperation parcel thrombus inside and by drag into in the sheath according to the preface, then take out sheath pipe and the control rod in it, thereby realize taking out of thrombus, adopt above-mentioned mode, can operate repeatedly many times, reach the purpose of cleaing away the thrombus. The intravascular thrombus taking device is usually used for taking thrombus in veins, but can also be used for taking thrombus in arteries.

Compared with the prior art, the intravascular thrombus taking device has the advantages that thrombus can be taken through the first dense net and the second dense net, blood flow can penetrate through the dense nets, so that the blood flow cannot be blocked during thrombus taking, the first dense net and the second dense net are matched to form the thrombus filtering cover, thrombus entering the thrombus filtering cover is difficult to escape, and the first dense net and the second dense net can be unfolded and contracted only by moving the control lever relative to the sheath tube by utilizing the elastic automatic opening characteristic of the first dense net and the second dense net and inserting the part of the first dense net into the second dense net, so that thrombus is collected and wrapped; the first dense net and the second dense net are designed into the umbrella-shaped structure formed by serially connecting the conical section and the straight cylinder section, so that the thrombus filtering cover formed by matching the second dense net and the first dense net in the unfolding state is of a capsule-shaped structure, the volume of the thrombus filtering cover can be increased, and the capsule-shaped structure is more smooth and is not easy to scratch the inner wall of a blood vessel.

The conception, specific structure and effects of the present invention will be further described in conjunction with 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 thrombectomy device of the present invention;

fig. 2 is a schematic sectional structure view of the intravascular thrombus removal device of the invention.

The device comprises a sheath tube 1, a control rod 2, a guide wire 3, a first dense net 4, a conical section 41, a straight tube section 42, a second dense net 5 and an annular inlet 6.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the description of the specific embodiments is intended to be illustrative of the invention and is not intended to limit the invention.

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 to the other element through intervening elements.

As shown in fig. 1-2, an intravascular embolectomy 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 mesh 4 and a second dense mesh 5 axially arranged on the operating rod 2, wherein the first dense mesh 4 and the second dense mesh 5 are elastic umbrella-shaped structures capable of automatically expanding in a natural state, closed ends of the first dense mesh 4 and the second dense mesh 5 are fixedly connected with the operating rod 2, open ends are sleeved outside the sheath tube 1 and oppositely arranged, an open end part of the first dense mesh 4 is inserted into an open end of the second dense mesh 5 so as to form a filter plug cover in a matching manner, the first dense mesh 4 is positioned at the far end of the second dense mesh 5, part of the second dense mesh 5 is sleeved outside the first dense mesh 4, and the outer diameter of the second dense mesh 5 in an expanded state is larger than the outer diameter of the first mesh 4 so that an annular inlet 6 communicated with the interior of the filter plug cover is formed at the overlapping position of the second dense mesh 5 and the first mesh 4, the operating rod 2 can move axially relative to the sheath 1, so that the first dense mesh 4 and the second dense mesh 5 can be pushed out of the sheath 1 and automatically expanded or pulled in and contracted in the sheath 1.

In this embodiment, the first dense net 4 and the second dense net 5 are both umbrella-shaped structures formed by serially connecting a tapered section 41 and a straight cylinder section 42, the closed end is located at the top end of the tapered section 41, the open end is located at the free end of the straight cylinder section 42, the tapered section 41 and the straight cylinder section 42 are integrally formed, and the filter plug cover formed by matching the second dense net 5 and the first dense net 4 in the unfolded state is of a capsule-shaped structure. In other embodiments, the first dense mesh 4 and/or the second dense mesh 5 may also adopt other forms of structures.

In this embodiment, the first dense mesh 4 and the second dense mesh 5 are made of elastic metal meshes. In other embodiments, the first dense net 4 and the second dense net 5 may also be made of elastic metal ribs and mesh covers covering the outside.

In other embodiments, the intravascular embolectomy device may not be provided with the guide wire 3, and the guide wires of other interventional treatment devices may be shared.

When the sheath catheter is used, the first dense net 4 and the second dense net 5 on the control rod 2 are firstly contracted in the sheath catheter 1, then the sheath catheter 1 and the control rod 2 in the sheath catheter are sent to a specified position in a blood vessel under the guidance of the guide wire 3, then the control rod 2 is pushed to move towards the far end relative to the sheath catheter 1, so that the first dense net 4 and the second dense net 5 are driven to sequentially push out the sheath catheter 1, the first dense net 4 and the second dense net 5 are naturally unfolded and matched after being separated from the constraint of the sheath catheter 1 to form a filter plug cover (the outer diameters of the unfolded first dense net 4 and the second dense net 5 are both smaller than the inner diameter of the blood vessel where the first dense net 4 and the second dense net 5 are located, so that the inner wall of the blood vessel cannot be scratched), when blood flows through, the blood enters the interiors 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 blood flows out, the filter plug cover is dragged to move towards the near end relative to the sheath catheter 1 through the control rod 2, the blind end of the second dense net 5 butts the sheath pipe 1 earlier and contracts under the extrusion of sheath pipe 1, because the open end cover of the second dense net 5 is in the open end outside of first dense net 4, consequently can extrude first dense net 4 inwards and then drive first dense net 4 and also contract simultaneously, thereby make the second dense net 5 and first dense net 4 all contract and cooperate the inside thrombus of parcel and by in the sheath pipe 1 of being dragged into according to the preface, then take out sheath pipe 1 and the control lever 2 in it, thereby realize taking out of thrombus, adopt above-mentioned mode, can operate repeatedly many times, reach the purpose of cleaing away the thrombus. The intravascular thrombus taking device is usually used for taking thrombus in veins, but can also be used for taking thrombus in arteries.

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 penetrate through the dense nets, so that the blood flow cannot be blocked during thrombus taking, the first dense net 4 and the second dense net 5 are matched to form the thrombus filtering cover, thrombus entering the thrombus filtering cover is difficult to escape, the first dense net 4 and the second dense net 5 can be unfolded and contracted only by utilizing the elastic automatic opening characteristic of the first dense net 4 and the second dense net 5 and overlapping and sleeving of the second dense net 5 on the part of the first dense net 4, so that the thrombus can be collected and wrapped only by moving the operating rod 2 relative to the sheath tube 1, the structure is simple, the design is ingenious, the use is convenient and rapid, and the thrombus taking effect is good; the first dense net 4 and the second dense net 5 are designed into an umbrella-shaped structure formed by serially connecting the conical section 41 and the straight cylinder section 42, so that the embolus filtering cover formed by matching the second dense net 5 and the first dense net 4 in an unfolded state is of a capsule-shaped structure, the volume of the embolus filtering cover can be increased, and the capsule-shaped structure is smoother and is not easy to scratch the inner wall of a blood vessel.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An intravascular thrombus taking device is characterized by comprising a sheath tube, an operating rod penetrating through the sheath tube, a first dense net and a second dense net which are arranged on the operating rod along the axial direction, wherein the operating rod is provided with a middle hole for a guide wire to penetrate through along the axial direction, the first dense net and the second dense net are elastic umbrella-shaped structures which can be automatically unfolded in a natural state, the closed ends of the first dense net and the second dense net are fixedly connected with the operating rod, the open ends of the first dense net and the second dense net are oppositely arranged, the part of the first dense net is inserted into the second dense net so as to be matched with each other to form a thrombus filtering cover, the first dense net is positioned at the far end of the second dense net, the outer diameter of the second dense net is larger than the outer diameter of the first dense net in an unfolded state so as to form an annular inlet communicated with the inside of the thrombus filtering cover at the overlapped part of the second dense net and the first dense net, and the operating rod can axially move relative to the sheath tube, thereby the first dense net and the second dense net can be pushed out of the sheath tube and automatically expanded or pulled in and contracted in the sheath tube.

2. The intravascular embolectomy device of claim 1, wherein the first dense mesh and the second dense mesh are both umbrella-shaped structures formed by serially connecting a conical section and a straight cylinder section, 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 cylinder section, the conical section and the straight cylinder section are integrally formed or fixedly connected, and the embolus filtering cover formed by matching the second dense mesh with the first dense mesh in an unfolded state is a capsule-shaped structure.

3. The endovascular embolectomy device of claim 1, wherein the first dense mesh and/or the second dense mesh are made of an elastic metal mesh, or made of a mesh cover with elastic metal ribs fitted outside.

4. The endovascular embolectomy device of claim 1, further comprising a guide wire passing through the central bore of the control rod.