CN111938748A

CN111938748A - Thrombus taking device

Info

Publication number: CN111938748A
Application number: CN202010728180.0A
Authority: CN
Inventors: 李涛; 梁栋科; 叶丽珍; 陈万祺
Original assignee: Shanghai Puhui Medical Equipment Co ltd
Current assignee: Shanghai Puhui Medical Equipment Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2020-11-17

Abstract

The invention relates to the field of medical instruments, and particularly discloses a thrombus removal device, which comprises a conveying pipe; a catheter slidably disposed within the delivery tube along an axial direction thereof, a distal end of the catheter extending out of a distal end of the delivery tube; a collection mesh having a collection lumen with a distal end presenting a first opening, a proximal end of the collection mesh being secured to the distal end of the catheter and positioned outside the delivery tube; a negative pressure device for generating a negative pressure within the hollow cavity between the inner wall of the delivery tube and the outer wall of the catheter. Through set up the collecting pipe at the distal end of pipe, be in through negative pressure equipment the inner wall of conveyer pipe with hollow intracavity production negative pressure between the outer wall of pipe for the thrombus of waiting to catch is adsorbed to being located on the pipe distal end outside the conveyer pipe under the effect of negative pressure, and can be collected the inside that the net was accomodate to the net, realizes that the thrombus can be accomodate the effect in collecting the net.

Description

Thrombus taking device

Technical Field

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

Background

Acute ischemic stroke is a serious hazard to human life and requires immediate treatment. Typical treatment options include intravenous injection of thrombolytic drugs or the use of special embolectomy devices. The first option involves the use of thrombolytic agents, such as thrombolytic agents, but this method is not effective for long treatment times; a second option consists of using an embolectomy device, the purpose of which is to physically capture the thrombus or clot and remove it from the occluded vessel, thus restoring blood flow, the main advantage of which is that it can extend the treatment time from 4.5 hours to 10 hours. Therefore, in the treatment process of acute cerebral arterial thrombosis, a plurality of methods of thrombus removal instruments are adopted.

The existing thrombus taking device sucks thrombus by using negative pressure, and particularly comprises a conveying pipe, a catheter arranged in the conveying pipe and negative pressure equipment for pumping a hollow cavity between the outer wall of the catheter and the inner wall of the conveying pipe into a negative pressure environment. When the thrombus in blood is taken out by the thrombus taking device, the distal ends of the delivery pipe and the catheter are integrally inserted into the blood vessel of a human body, and the distal end of the catheter extends out of the distal end of the delivery pipe; negative pressure equipment opens and makes and hold intracavity formation negative pressure environment, and then the distal end of pipe also becomes negative pressure environment, and under the effect of this negative pressure, the thrombus in the blood is adsorbed on the distal end of pipe, treats the thrombus and adsorbs the back, need take out conveyer pipe, pipe and adsorbed thrombus whole from the blood vessel.

However, in the process of taking out the thrombus from the blood vessel, the thrombus is in a state of being adsorbed on the catheter, and the delivery tube and the catheter of the thrombus taking device are always in a negative pressure state, so that in the process of taking out the thrombus from the blood vessel, the thrombus at the distal end of the catheter receives the adsorption force of the catheter and also receives the pressure continuously transmitted from the accommodating cavity of the delivery tube, so that the part of the thrombus or blood clot which is not in adsorption contact with the catheter, for example, the thrombus at the distal end of the catheter, receives the pressure continuously transmitted from the accommodating cavity of the delivery tube and sucks part of the thrombus from the whole thrombus by the pressure, the thrombus falls off, and the thrombus is pushed into the blood vessel by the pressure, the blood vessel is blocked, and the thrombus taking effect is not ideal.

Disclosure of Invention

Therefore, the invention aims to overcome the defects that thrombus or blood clots at the far end of a catheter in the prior art can impact the blood vessel wall during the pulling-back movement and fall off from the catheter under the action of the pressure, so that the thrombus extraction effect is not ideal, and the thrombus at the far end of the catheter can be protected.

A thrombus removal device comprises a delivery pipe; a catheter slidably disposed within the delivery tube along an axial direction thereof, a distal end of the catheter extending out of a distal end of the delivery tube; a collection mesh having a collection lumen with a distal end presenting a first opening, a proximal end of the collection mesh being secured to the distal end of the catheter and positioned outside the delivery tube; a negative pressure device for generating a negative pressure within the hollow cavity between the inner wall of the delivery tube and the outer wall of the catheter.

Optionally, in the thrombus removal device, a proximal end of the collection net is contracted; and/or the meshes of the collecting net are rhombic.

Optionally, in the thrombus removal device, the inner diameter of the collection net gradually decreases from the distal end to the proximal end thereof; or

The collecting net comprises a hollow cylindrical body and a contraction part fixed on the near end of the hollow cylindrical body, and the contraction part is used as the near end of the collecting net.

Optionally, in the thrombus removal device, both the inner wall surface and the outer wall surface of the delivery pipe are smooth surfaces.

Optionally, in the thrombus removal device, the outer wall surface of the delivery tube is coated with a hydrophilic coating to form a smooth surface.

Optionally, in the thrombus removal device, the delivery pipe includes a pipe body, at least one toughening layer wrapped outside the pipe body, and a supporting layer laid on the toughening layer.

Optionally, in the above embolectomy device, the catheter has a hollow cavity penetrating through the proximal end and the distal end of the catheter along the axial direction of the catheter; the collecting cavity of the collecting net is communicated with the hollow cavity; at least part of the collecting net has a cross-sectional area along the radial direction of the conduit larger than that of the conduit;

the thrombus removal device further comprises a release tube, the release tube is slidably arranged in the hollow cavity, and the release tube is provided with a release cavity;

the thrombus removal device also comprises a thrombus removal support which can be arranged in the release cavity in a sliding manner and a pushing element which is fixed on the proximal end of the thrombus removal support, wherein the distal end of the pushing element extends out of the distal end of the catheter;

the thrombus taking support is driven by the pushing piece to slide and can be switched between a collecting state of being collected in a release cavity of the release tube and a releasing state of being stretched out of the release cavity.

Optionally, in the thrombus removal device, the thrombus removal support comprises a plurality of ribs extending in the axial direction of the catheter and arranged in the radial direction of the catheter, and any one of the ribs is distributed in a sinusoidal curve;

in any adjacent three ribs, the wave trough of the rib positioned in the middle is connected with the wave crest of the rib on one side, and the wave crest of the rib positioned in the middle is connected with the wave trough of the rib on the other side;

in two adjacent ribs, a capturing mesh is enclosed between two adjacent wave crests of one rib and two adjacent wave troughs of the other rib.

Optionally, in the thrombus removal device, the proximal ends of all the ribs are fixedly converged into a first end part as the proximal end of the thrombus removal support; at the far ends of all the ribs, the far ends of every two ribs are fixedly converged into a second end part, and all the second end parts are used as the far ends of the embolectomy brackets.

Optionally, in the thrombus removal device, all the ribs are distributed on the same cylindrical surface, and the second end part is inclined towards the radial direction of the cylindrical surface.

Optionally, in the thrombus removal device, the collection net and/or any one of the ribs is further provided with a development mark.

The technical scheme of the invention has the following advantages:

1. the invention provides a thrombus removal device, which comprises a conveying pipe; a catheter slidably disposed within the delivery tube along an axial direction thereof, a distal end of the catheter extending out of a distal end of the delivery tube; a collection mesh having a collection lumen with a distal end presenting a first opening, a proximal end of the collection mesh being secured to the distal end of the catheter and positioned outside the delivery tube; a negative pressure device for generating a negative pressure within the hollow cavity between the inner wall of the delivery tube and the outer wall of the catheter.

In the thrombus taking device with the structure, the collecting pipe is arranged at the far end of the catheter, negative pressure is generated in the hollow cavity between the inner wall of the conveying pipe and the outer wall of the catheter through the negative pressure equipment, so that thrombus to be captured is adsorbed to the far end of the catheter positioned outside the conveying pipe under the action of the negative pressure, and can be collected into the collecting net by the collecting net, the effect that the thrombus can be collected into the collecting net is realized, meanwhile, when the conveying pipe, the catheter and the thrombus are pulled back, the thrombus positioned on the far end of the catheter simultaneously receives the adsorption force of the catheter and the pressure continuously transmitted from the containing cavity of the conveying pipe, and part of the thrombus is sucked away from the whole thrombus by the pressure, although the thrombus falling condition can also occur under the negative pressure state, due to the arrangement of the collecting net, the blood vessel after falling can be limited by the collecting net, under the action of the negative pressure, when thrombus rushes into the blood vessel, the collection net can provide the thrombus with a blocking force to block the thrombus from rushing into the blood vessel, so that the condition of thrombus blockage is avoided.

2. In the thrombus removal device provided by the invention, the near end of the collection net is in a contracted shape; and/or the meshes of the collecting net are rhombic.

In the thrombus taking device with the structure, the near end of the collecting net is arranged in a contracted state, and the inner diameters of the conveying pipe and the guide pipe are smaller than the inner diameter of the collecting net, so that when the guide pipe and the collecting net carry thrombus to move in a blood vessel, the collecting net with the contracted near end can provide a supporting force for the blood vessel, the blood vessel with the smaller inner diameter is firstly supported, so that the thrombus at the far end can be smoothly transited to the supported blood vessel during moving, and the collecting net can conveniently move in the blood vessel and be extracted from the blood vessel; the mesh of the collection net is arranged in a rhombus shape, so that the thrombus can be stably contained in the collection net.

3. In the thrombus removal device provided by the invention, the inner diameter of the collection net is gradually reduced from the distal end to the proximal end; or the collecting net comprises a hollow cylindrical body and a contraction part fixed on the proximal end of the hollow cylindrical body, and the contraction part is used as the proximal end of the collecting net.

In the thrombectomy device of this structure, collect the internal diameter of net and reduce gradually or collect the net and include hollow cylinder body and fix the constriction part on the near-end of hollow cylinder body, the constriction part is regarded as collect the near-end of net for the collection piece is hourglass hopper-shaped, when pulling back the pipe out the blood vessel, is that the collection net that leaks hopper-shaped can be smooth and easy takes out from the blood vessel.

4. In the thrombus removal device provided by the invention, the inner wall surface and the outer wall surface of the conveying pipe are smooth surfaces.

In the thrombectomy device of this structure, through setting up the internal face and the outer wall surface with the conveyer pipe into smooth surface, can reduce the pipe when sliding motion in the conveyer pipe, frictional force between pipe and the conveyer pipe to reduce the movement resistance of pipe, realize the effect that the pipe can follow the smooth output in the conveyer pipe.

5. In the thrombus removal device provided by the invention, the conveying pipe comprises a pipe body, at least one toughening layer wrapped outside the pipe body, and a supporting layer paved on the toughening layer.

In the thrombectomy device of this structure, through setting up toughening layer and supporting layer on the body with the conveyer pipe, can improve the structural strength of pipe body to when the realization is intervene the motion in the blood vessel, the conveyer pipe can move in the blood vessel steadily, and when through the blood vessel bend, because the intensity of conveyer pipe is great, consequently can avoid when passing through the bend, the conveyer pipe is owing to buckle the condition of breaking off.

6. In the thrombus removal device provided by the invention, the catheter is provided with a hollow cavity penetrating through the proximal end and the distal end of the catheter along the axial direction of the catheter; the collecting cavity of the collecting net is communicated with the hollow cavity; at least part of the collecting net has a cross-sectional area along the radial direction of the conduit larger than that of the conduit;

In the thrombus taking device with the structure, a hollow cavity is arranged in a catheter, a release pipe is arranged in the hollow cavity, the release pipe is provided with a release cavity, a thrombus taking bracket is arranged at the far end of a pushing member, the thrombus taking bracket is released from the release cavity of the release pipe by utilizing a pushing rod to catch thrombus, after the thrombus taking bracket finishes the action of catching the thrombus, the conveying pipe is withdrawn by pulling back, so that the conveying pipe can move towards the near end of the catheter along the outer surface of the catheter, a collection net can be released from the conveying pipe, then the release pipe is pulled back to the near end of the catheter, the release pipe can drive the pushing member to move along the hollow cavity of the catheter and enter the collection net, the pulling back of the release pipe is stopped, the thrombus carried by the thrombus taking bracket is contained in the collection net, finally, the whole thrombus taking device is taken out from a blood vessel, and the collection net can provide a blocking force for the thrombus in the taking-out process, block the thrombus and dash to the blood vessel, and then avoid resulting in the condition of thrombus jam to take place, simultaneously, because the thrombus is collected the net and is accomodate, also can avoid when will pullback, the thrombus or the blood clot of pipe distal end also can be met the vascular wall at the motion in-process of pullback to lead to the thrombus to wash to the blood vessel after coming off from getting to tie the support under the effect of this pressure in, make the unsatisfactory condition of bolt effect of taking out.

7. In the bolt taking device provided by the invention, the wave trough of the rib positioned in the middle is connected with the wave crest of the rib on one side, and the wave crest of the rib positioned in the middle is connected with the wave trough of the rib on the other side; in two adjacent ribs, a capturing mesh is enclosed between two adjacent wave crests of one rib and two adjacent wave troughs of the other rib. In the thrombus taking device with the structure, the thrombus taking bracket can have enough and uniform supporting force in the process of catching the thrombus, and the thrombus cannot be cut.

8. In the thrombus removal device provided by the invention, all the ribs are distributed on the same cylindrical surface, and the second end part deflects towards the radial direction of the cylindrical surface. This structure is through with the rib distributes on same face of cylinder, and the radial slope of the second tip towards the face of cylinder that the distal end of every two ribs formed for when catching the thrombus, the rib of second tip can be firmly fixed with the thrombus of embedding on the support of emboliaing.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a thrombus removal device provided in a first embodiment of the present invention;

FIG. 2 is a schematic view of the whole structure of the thrombus removal device of FIG. 1 with the collection net extending out of the delivery pipe;

FIG. 3 is a schematic view of the collection net and the conduit and the delivery pipe at an enlarged circle shown in FIG. 2;

FIG. 4 is a schematic structural view of a second embodiment of the thrombectomy stent provided in the present invention after being spread;

FIG. 5 is a schematic radial cross-sectional view of the positioning structure of the pushing member and the release tube, the catheter and the delivery tube according to a second embodiment of the present invention;

FIG. 6 is a schematic axial cross-sectional view of the position structure of the thrombectomy stent, the pushing member and releasing tube, the catheter and the delivery tube according to the second embodiment of the present invention;

description of reference numerals:

1-a conveying pipe;

2-a catheter;

3-collecting the net; 31-a hollow cylindrical body; 32-a constriction;

4-a release tube;

5-thrombus taking support;

51-ribs; 52-wave trough; 53-wave crest; 54-capture mesh; 55-a first end portion; 56-a second end;

6-a pushing member; 7-negative pressure equipment;

l1-first ribs; l2-second ribs; l3-third ribs.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The terms "proximal" and "distal" used herein to describe positions and orientations refer to an operator of the instrument (not shown), with the end closer to the operator being the proximal end and the end farther from the operator being the distal end.

Example 1

This embodiment describes an embolectomy device, after intervention into a blood vessel, for removing thrombus or blood clots in the blood vessel from the blood vessel and collecting the thrombus or blood clots during the removal, which comprises a delivery tube 1, a catheter 2, a collection net 3 and a negative pressure device 7, wherein the delivery tube 1 has a cavity penetrating through both ends thereof, the catheter 2 is slidably disposed inside the cavity of the delivery tube 1 along an axial direction thereof, a distal end of the catheter 2 is switched between a state of protruding out of the distal end of the delivery tube 1 and being accommodated inside an inner cavity of the delivery tube 1, the collection net 3 has a collection chamber, a distal end of the collection chamber is provided with a first opening, a proximal end of the collection net 3 is fixed on the distal end of the catheter 2 and can protrude out of the delivery tube 1 by being driven by the catheter 2 to expand and collect thrombus after protruding out of the delivery tube 1, the negative pressure device 7 is used for generating negative pressure between the hollow cavity between the inner wall of the conveying pipe 1 and the outer wall of the catheter 2, so that thrombus enters the collecting net 3 along the first opening and can be adsorbed to the adsorption end of the catheter 2 under the action of the pressure after the negative pressure is generated;

when the conveying pipe 1, the catheter 2 and the thrombus are pulled back, the thrombus at the far end of the catheter 2 is simultaneously subjected to the adsorption force of the catheter 2 and the pressure continuously transmitted from the accommodating cavity of the conveying pipe 1 and is sucked away by the pressure from the whole thrombus, although the thrombus can fall off under the negative pressure state, the fallen blood vessel is limited by the collecting net 3 due to the arrangement of the collecting net 3, when the thrombus rushes into the blood vessel under the action of the negative pressure, the collecting net 3 provides a blocking force for the thrombus to block the thrombus from rushing into the blood vessel, thereby avoiding the condition of thrombus blockage, and simultaneously, because the thrombus is contained by the collecting net 3, the thrombus or blood clots at the far end of the catheter 2 can also be prevented from colliding with the blood vessel wall during the pulling back movement and fall off from the catheter 2 under the action of the pressure, towards the blood vessel, so that the thrombus extraction effect is not ideal;

because the thrombus is restrained by the vessel wall when the vessel is blocked by the thrombus during the thrombus taking operation and the pulling-back process, therefore, the small-particle thrombus hidden in the thrombus does not fall off from the whole thrombus, but in the process of sucking and pulling back the thrombus onto the catheter 2, because the thrombus is positioned in the collection net 3 and loses the restraint of the vessel wall, the thrombus loosens when being dragged in the vessel, at the moment, small particle thrombus hidden in the thrombus scatters out of the whole thrombus and rushes into the vessel, and set up and collect net 3 and can realize blockking of the tiny particle thrombus that wafts out, utilize and collect net 3 and retrain the thrombus, the thrombus is tightly pasted in collecting net 3, has reduced the quantity that the tiny particle thrombus that drops enters into blood vessel, also can avoid a large amount of tiny particle thrombus to dash to blood vessel for take out the unsatisfactory condition of bolt effect.

In this embodiment, referring to fig. 1, 2, and 3, the proximal end of the collecting net 3 may be in a contracted shape, the distal end of the collecting net 3 is provided with a first opening, and the inner diameters of the conveying pipe 1 and the conduit 2 are smaller than the inner diameter of the collecting net 3, so that when the conduit 2 and the collecting net 3 carry thrombus to move in a blood vessel, the collecting net 3 in a contracted shape at the proximal end can provide a supporting force for the blood vessel, so as to support the blood vessel with a smaller inner diameter, so that the thrombus at the distal end can smoothly transit to the supported blood vessel during movement, and the collecting net 3 can move in the blood vessel and be extracted from the blood vessel;

specifically, the inner diameter of the collection net 3 may be gradually reduced from the distal end to the proximal end, and at this time, the collection net 3 has a conical overall structure, and the proximal end thereof is connected to the catheter 2; or the collecting net 3 may be configured to include a hollow cylindrical body 31 and a contracting portion 32 fixed to the proximal end of the hollow cylindrical body 31, the contracting portion 32 serves as the proximal end of the collecting net 3 and is fixedly connected to the catheter 2, the hollow cylindrical body 31 serves as a collecting cavity of the collecting net 3 and is used for collecting thrombus or blood clots adsorbed to the catheter 2, the collecting net 3 is funnel-shaped in the overall structure, and the collecting net 3 can be smoothly taken out of the blood vessel when the catheter 2 is pulled back out of the blood vessel.

In this embodiment, the delivery pipe 1 includes a pipe body, a toughening layer and a supporting layer, the toughening layer wraps the outer surface of the pipe body, and the supporting layer is laid on the outer surface of the toughening layer, so as to form the delivery pipe 1 with a certain strength structure, thereby avoiding the fracture of the delivery pipe 1 due to bending when passing through a vascular curve, wherein the pipe body is made of ultra-smooth polytetrafluoroethylene material or polyamide material; this layer adopts stainless steel mesh grid or nickel titanium alloy to compile and strengthens, this supporting layer uses nylon or polyurethane to wrap up in the layer of toughening, wherein, the layer of toughening can set up the one deck, also can set up two-layerly, the three-layer, specific quantity arranges according to actual conditions, the supporting layer is when adopting the nylon material to lay the layer of toughening, nylon adopts the nylon of different hardness, for example, nylon 6 is laid in proper order on the layer of toughening of different regions respectively to the near-end along the distal end of pipe body, nylon 66, the supporting layer of nylon 610 material, in order to form the conveyer pipe that has different regional hardness, because the distal end needs buckle in the blood vessel, consequently, need intensity some greatly at the distal end, possess good propelling movement nature.

In order to reduce the effect that the catheter 2 can be smoothly output from the delivery pipe 1 when the catheter 2 slides in the delivery pipe 1, the inner wall surface and the outer wall surface of the delivery pipe 1 can be set to be smooth surfaces, so that the friction force between the catheter 2 and the delivery pipe 1 is reduced, the movement resistance of the catheter 2 is reduced, and the resistance of the delivery pipe 1 during the movement in the blood vessel can also be reduced.

In this embodiment, the negative pressure device 7 includes a luer connector and a Y-type connector, after one end of the luer connector is fixedly connected to one end of a main branch of the Y-type connector, the delivery pipe 1 is installed at the other end of the luer connector, one end of a fixed collection net 3 on the catheter 2 enters into a cavity of the delivery pipe 1, the other end of the catheter 2 passes through the Y-type connector and the luer connector and is connected to a pushing handle, a branch of the Y-type connector is connected to an air extractor, the air extractor can perform air extraction between a hollow cavity between an inner wall of the delivery pipe 1 and an outer wall of the catheter 2, so that negative pressure is generated between the hollow cavities, and then the delivery pipe 1 is withdrawn, so that one end of the fixed collection net 3 on the catheter 2 extends out of the delivery pipe 1, and thrombus is captured.

Example 2:

the present embodiment is different from embodiment 1 in that, referring to fig. 4, 5 and 6, the embolectomy device in this embodiment further includes a release tube 4, an embolectomy stent 5 and a pushing member 6, the embolectomy stent 5 is fixed at the distal end of the pushing member 6, the catheter 2 has a hollow cavity penetrating through the proximal end and the distal end along the axial direction, the collection cavity of the collection mesh 3 is communicated with the hollow cavity, wherein the cross-sectional area of at least a part of the collection mesh 3 along the radial direction of the catheter 2 is larger than the cross-sectional area of the catheter 2 along the radial direction thereof, so as to be able to serve as a collection cavity to receive thrombus;

specifically, the release tube 4 is slidably disposed in the hollow cavity, the release tube 4 has a release cavity extending through the distal end and the proximal end of the release tube 4, the distal end of the pusher 6 carries the thrombectomy stent 5 to slidably move in the release cavity, and the distal ends of the thrombectomy stent 5 and the pusher are driven by the pusher 6 to move out of the release cavity to the outside of the distal end of the catheter 2 to capture thrombi; the thrombus extraction stent 5 can be folded in the release cavity by pulling back the pushing component 6 in the process of inserting the thrombus extraction stent 5 into the blood vessel;

when the thrombus is not successfully captured by the thrombus taking support 5, the thrombus taking support 5 is pulled back to the inside of the release cavity to carry out secondary release so as to capture the thrombus, the thrombus taking support 5 can be switched between a collection state of being collected in the release cavity of the release tube 4 and a release state of being extended out of the release cavity by operating the pushing member 6, wherein the release state of extending the thrombus taking support 5 out of the release cavity is realized by pushing the pushing member 6 to move towards the far end of the release tube 4 and the far end of the conveying tube 1 so as to release the thrombus taking support 5 from the release cavity, the conveying tube 2 and the conveying tube 1 so as to capture the thrombus, the release state of the thrombus taking support 5 is realized, in the release state, the collection net 3 is positioned in the conveying tube 1, only after the thrombus is successfully captured by the thrombus taking support 5, the conveying tube 1 is withdrawn, the collection net 3 is extended out of the conveying tube 1, and the proximal end movement of the conveying member 6 is continuously pulled back, to achieve the effect of the thrombus entering the collection net 3.

In the present embodiment, referring to fig. 4, the thrombus-taking stent 5 comprises a plurality of ribs 51 extending along the axial direction of the catheter 2 and arranged along the radial direction of the catheter 2, wherein any one of the ribs 51 is distributed in a sinusoidal shape and has peaks 53 and valleys 52, wherein, in any adjacent three of the ribs 51, the valleys 52 of the middle rib 51 are connected with the peaks 53 of the ribs 51 on one side, the peaks 53 of the middle rib 51 are connected with the valleys 52 of the ribs 51 on the other side, and after the plurality of ribs 51 are connected and arranged in this way, a net structure is formed, wherein in two adjacent ribs 51, two adjacent peaks 53 of one rib 51 and two adjacent valleys 52 of the other rib 51 enclose a capturing net 54 for capturing thrombus, wherein in order to be able to provide stable and uniform supporting force during capturing thrombus, the wave troughs 52 of the middle ribs 51 of any three adjacent ribs 51 can be connected with the wave crests 53 of the ribs 51 on one side in a facing manner, and the wave crests 53 of the middle ribs 51 are connected with the wave troughs 52 of the ribs 51 on the other side in a staggered manner, so that the formed thrombus taking support 5 has a staggered connection structure between the wave crests 53 and the wave troughs 52 between the ribs 51 and the ribs 51, and the thrombus taking support 5 has enough and uniform supporting force, can be stably fixed on the thrombus taking support 5, and cannot cut thrombus;

referring to fig. 4, taking the first rib L1, the second rib L2, and the third rib L3 as an example, the peak of the first rib L1 and the valley of the third rib L3 are staggered when connected, and the valley of the first rib L1 and the peak of the second rib L2 are opposite when connected, so that the formed thrombus taking support 5 has a staggered connection structure between the peak and the valley between the first rib L1 and the second rib L2, and further the thrombus taking support 5 has a large enough and uniform supporting force, and can stably fix the thrombus on the thrombus taking support 5 without cutting the thrombus;

specifically, all the ribs 51 of the thrombectomy support 5 are distributed on the same cylindrical surface, and the proximal ends of the ribs 51 are fixedly converged into a first end portion 55 to serve as the proximal end of the thrombectomy support 5; at the far end of all the ribs 51, the far ends of every two ribs 51 can be fixedly converged to form a second end 56, the radial deflection of the second end 56 towards the cylindrical surface takes all the second ends 56 as the far ends of the thrombus taking support 5, wherein after the thrombus taking support 5 is formed, the thrombus taking support 5 is spread out to be fan-shaped, the first end 55 of the fan-shaped thrombus taking support 5 is fixed on the far end of the pushing member 6, the thrombus taking support 5 body can be wound together, the whole thrombus taking support 5 is folded in the release cavity of the release tube 4, in order to ensure that the thrombus taking support 5 can firmly fix thrombus embedded on the thrombus taking support 5 when capturing the thrombus, all the ribs 51 can be distributed on the same cylindrical surface, and the second end 56 is deflected towards the radial direction of the cylindrical surface, so that the far end of the thrombus taking support 5 has a plurality of adducted second ends 56, the thrombus can be firmly fixed on the thrombus taking support 5.

In this embodiment, the collecting net 3 and/or any one of the ribs 51 may further be provided with a developing mark for marking a position when the thrombus removal stent 5 or the collecting net 3 is inserted into a blood vessel, where the developing mark may be provided on the thrombus removal stent 5, specifically, may be provided at a proximal end of the rib 51, or may be provided at a distal end of the rib 51, or may be provided on the body of the collecting net 3, specifically, the number of the developing mark may be one, two, three, and the specific number is arranged according to an actual use condition, and the developing mark is made of a noble metal developing material, which may be tungsten steel, platinum alloy, gold, or palladium gold.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A thrombus taking device is characterized by comprising

A delivery pipe (1);

the catheter (2) is arranged in the conveying pipe (1) in an axially sliding mode, and the far end of the catheter (2) extends out of the far end of the conveying pipe (1);

a collecting net (3) which is provided with a collecting cavity with a first opening at the far end, and the near end of the collecting net (3) is fixed on the far end of the catheter (2) and is positioned outside the conveying pipe (1);

a negative pressure device (7) for generating a negative pressure in the hollow cavity between the inner wall of the delivery tube (1) and the outer wall of the catheter (2).

2. The embolectomy device of claim 1, wherein the proximal end of the collection mesh (3) is constricted; and/or

The meshes of the collecting net (3) are in a diamond shape.

3. The embolectomy device of claim 2, wherein the inner diameter of the collection mesh (3) decreases from the distal end towards the proximal end thereof; or

The collecting net (3) comprises a hollow cylindrical body (31) and a contraction part (32) fixed on the near end of the hollow cylindrical body (31), and the contraction part (32) serves as the near end of the collecting net (3).

4. The embolectomy device of any of claims 1-3, wherein the inner and outer wall surfaces of the delivery tube (1) are smooth surfaces.

5. The embolectomy device of claim 4, wherein the outer wall surface of the delivery tube (1) is coated with a hydrophilic coating to form a smooth surface.

6. The embolectomy device of claim 4, wherein the delivery tube (1) comprises a tube body, at least one toughening layer wrapped outside the tube body, and a support layer laid on the outside of the toughening layer.

7. The embolectomy device of any of claims 1-6, wherein the catheter (2) has a proximal and distal hollow lumen therethrough in its axial direction; the collecting cavity of the collecting net (3) is communicated with the hollow cavity; at least part of the collecting net (3) has a cross-sectional area in the radial direction of the duct (2) larger than that of the duct (2);

the thrombus removal device further comprises a release tube (4), the release tube (4) is slidably arranged in the hollow cavity, and the release tube (4) is provided with a release cavity;

the thrombus removal device further comprises a thrombus removal support (5) which is slidably arranged in the release cavity and a pushing member (6) which is fixed on the proximal end of the thrombus removal support (5), and the distal end of the pushing member (6) extends out of the distal end of the catheter (2);

the thrombus taking support (5) is driven by the pushing piece (6) to slide and can be switched between a collection state collected in a release cavity of the release pipe (4) and a release state extending out of the release cavity and expanding.

8. The embolectomy device of claim 7, wherein the embolectomy support (5) comprises a plurality of ribs (51) extending along the axial direction of the catheter (2) and arranged along the radial direction of the catheter (2), and any rib (51) is distributed in a sine curve;

in any adjacent three ribs (51), the wave trough (52) of the middle rib (51) is connected with the wave crest (53) of one side rib (51), and the wave crest (53) of the middle rib (51) is connected with the wave trough (52) of the other side rib (51);

in two adjacent ribs (51), a capturing mesh (54) is defined between two adjacent peaks (53) of one rib (51) and two adjacent valleys (52) of the other rib (51).

9. The embolectomy device of claim 8, wherein the proximal ends of all the ribs (51) are fixedly converged into a first end (55) as the proximal end of the embolectomy support (5); at the far ends of all the ribs (51), the far ends of every two ribs (51) are fixedly converged into a second end (56), and all the second ends (56) are used as the far ends of the embolectomy brackets (5).

10. The embolectomy device of claim 9, wherein all of the ribs (51) are distributed on the same cylindrical surface, and the second end (56) is biased radially toward the cylindrical surface.

11. The embolectomy device of any of claims 8-10, wherein the collecting mesh (3) and/or any of the ribs (51) are further provided with a visualization mark.