CN114271990B

CN114271990B - Thrombus filtering and removing net

Info

Publication number: CN114271990B
Application number: CN202111615940.8A
Authority: CN
Inventors: 陈秀敏; 胡柏成; 刘伟; 李清; 于鹏
Original assignee: Shanghai Aoliu Medical Technology Co ltd
Current assignee: Shanghai Aoliu Medical Technology Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-10-14
Anticipated expiration: 2041-12-27
Also published as: CN114271990A

Abstract

The invention discloses a thrombus filtering and removing net which comprises an outer filter net and guide strips, wherein the outer filter net is tubular and is provided with a proximal end opening and a distal end opening, the proximal end opening is provided with a proximal support frame, the distal end opening is provided with a distal support frame, the side edges of the two support frames are respectively connected to the guide strips, and the guide strips are sleeved with accommodating sheath tubes; in the process that the accommodating sheath pipe moves from the far-center end to the near-center end along the guide strip, the outer filter screen, the far-center support frame and the near-center support frame sequentially enter the accommodating sheath pipe until being completely accommodated. The invention can completely filter the blood at the position of the aortic arch in the TAVR operation, prevent thrombus from passing through the aortic arch, is convenient to collect and release and improves the operation efficiency.

Description

Thrombus filtering and removing net

Technical Field

The invention belongs to the technical field of medical instrument manufacturing, and particularly relates to a thrombus filtering and removing net.

Background

Transcatheter Aortic Valve Replacement (TAVR) was formally entered into the clinic in 2002, and in the long-term development, TAVR surgery has gained wide acceptance by physicians and patients. As the number of surgeries increases, post-operative complications associated with TAVR are also becoming increasingly prominent, with thrombus formation during and after surgery becoming of increasing concern. Relevant researches show that the probability of new stroke after TAVR can reach 5% at most, and the probability of various new ischemic brain injuries obtained through head magnetic resonance imaging detection statistics even reaches 90%. During TAVR procedures, manipulation of the catheter or guidewire can result in the shedding of calcified material from the aortic valve, where any debris, emboli, tissue, or foreign matter shed can cause the associated vessel to become occluded. Therefore, it is necessary to refine the relevant operation steps in TAVR surgery, and at the same time, to reduce the risk of complications during the surgical operation by means of brain protection and thrombus protection devices.

Currently, brain protection devices in TAVR surgery achieve brain protection mainly by two principles: (1) The filtering system is used for completely filtering embolus in circulation by placing a filter screen; (2) The shunt device changes the circulation path of embolus, so that the embolus changes from cerebral circulation to systemic circulation. Wherein, filtration system's means damage is less relatively, and convenient operation, is the first-choice in various operations, but, among the prior art filter equipment exist not enoughly in the filter effect, retrieve also relatively difficult loaded down with trivial details simultaneously.

Disclosure of Invention

In view of the above, the present invention provides a thrombus filtering and removing net to solve the deficiencies in the prior art.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the thrombus filtering and removing net comprises an outer filter net and a guide strip, wherein the outer filter net is tubular and is provided with a proximal end opening and a distal end opening, the proximal end opening is provided with a proximal support frame, the distal end opening is provided with a distal support frame, the side edges of the proximal support frame and the distal support frame are respectively connected to the guide strip, and a containing sheath tube is sleeved outside the guide strip; accomodate the sheath pipe along the guide strip removes the in-process from telecentric side to the proximal end, outer filter screen and its telecentric support frame with the proximal support frame gets into in proper order accomodate in the sheath pipe until being accomodate completely. The two ends of the outer filter screen are provided with the support frames, so that the two ends of the filter screen are propped open and attached to the vessel wall. The side edges of the proximal support frame and the distal support frame are respectively and vertically connected to the side wall of the tubular guide strip, so that the unfolded outer filter screen can be integrally attached to the guide strip and extend along the guide strip, and the arrangement of the support ribs of the outer filter screen can be reduced.

If the thrombus filtering and removing net further comprises an inner elastic filter net, the inner elastic filter net is funnel-shaped and is provided with a large telecentric opening end and a small telecentric opening end, and the large telecentric opening end of the inner elastic filter net is connected with the telecentric support frame in a surrounding manner; accomodate the sheath pipe along the guide strip removes the in-process from telecentric on end to proximal end, outer filter screen and telecentric on support frame interior elasticity filter screen with proximal support frame gets into in proper order accomodate in the sheath pipe until being accomodate completely.

Through the setting of interior elasticity filter screen for thrombus filter clears away the net and can not only protect the blood vessel of brain, can also carry out certain thrombus to the blood that human aortic arch flowed upwards and clear away. The funnel shape reserves a smooth passage with a small near-center opening for arterial blood flow during filtering to avoid blockage, and filtered thrombus is guided and reserved to an included angle between the outer filter screen and the inner elastic filter screen through the funnel wall, so that the problem that thrombus blocks are washed to the artery due to 'only filtering but not reserving' is solved.

If the thrombus filtering and removing net, the inner elastic filter net is woven by elastic wires.

The proximal end of the outer filter screen is not easy to be put into the sheath pipe due to the arrangement of the double filter screens, and meanwhile, the sheath pipe is not easy to be completely unfolded due to internal friction in the sheath pipe in the unfolding process, and the difficulty of stretching and putting in can be reduced by adopting independent elastic threads to weave without attaching a semipermeable membrane.

As the thrombus filtering and removing net, the surface of the inner elastic filter net is attached with a semipermeable membrane so as to increase the arterial thrombus blocking efficiency under the condition of operation requirement.

If the thrombus filtering and removing net, the aperture of the outer filter net is 0.05mm, and the aperture of the inner elastic filter net is 0.5mm.

The pore size of each department of thrombus filter clear away net can be adjusted according to actual need, and wherein outer filter screen sets up the little aperture and mainly provides the filtration guarantee as far as for blood vessel of brain, and interior elasticity filter screen sets up the big aperture and then is convenient whole accomodating under the prerequisite of guaranteeing thrombus collection efficiency.

If thrombus filters clears away the net, the nearly heart support frame and/or it is the circle body that constitutes by the design silk to telecentric support frame. The shrinkage and extension characteristics of the shaping wire can well meet the self-deformation requirements of the two support frames.

If the thrombus filtering and removing net, the proximal support frame and/or the distal support frame are/is a ring body formed by an elastic hose, the ring body is enlarged when the elastic hose is full, and the ring body is reduced when the elastic hose is emptied. The expansion is carried out through the air/liquid filling hose, and the recovery is carried out through the air/liquid emptying hose.

The thrombus filtering and removing net is characterized in that one side of a proximal region and/or a distal region of the guide strip is opened, and the proximal support frame and/or the distal support frame are reduced in volume outside the guide strip and are at least partially received in the guide strip.

The guide strip opening is referred to herein as having space therein to accommodate compressed or uncompressed proximal and/or distal support frames. The specific opening can be designed as one, and also can be designed correspondingly for a proximal support frame and a distal support frame respectively; generally, when the openings are designed respectively, most of the outer filter screen is still outside the guide bars after the outer filter screen is completely stored.

The thrombus filtering and removing net is characterized in that the lateral edge part of the proximal support frame and/or the distal support frame enters the inner cavity of the guide strip from the opening of the guide strip, and when the lateral edge part of the proximal support frame and/or the distal support frame is pulled, the volume of the proximal support frame and/or the distal support frame outside the guide strip is reduced and at least partially accommodated in the guide strip.

If thrombus filters clears away the net, be equipped with the coiling pivot in the gib block, nearly heart support frame and/or the local fixed connection in side of far heart support frame is to the coiling pivot. When the side edge part of the proximal support frame and/or the distal support frame is wound, the proximal support frame and/or the distal support frame is reduced in volume outside the guide strip and at least partially accommodated in the guide strip, and the rotation of the winding rotating shaft can be controlled manually or by an external instrument.

If thrombus filters clearance net, outer filter screen is the taper pipe form that proximal end diameter is big, distal end diameter is little to more adapt to the internal diameter of blood vessel. The proximal support frame and the distal support frame are respectively set to be suitable for the corresponding size of the outer filter screen.

If thrombus filters clears away the net, outer filter screen is flexible pellicle just the nearly heart end of outer filter screen is turned over the back parcel inwards and is fixed nearly heart support frame. Through the close heart support frame of cladding, avoid the stress injury to the vascular wall, guarantee flexible semipermeable membrane's laminating simultaneously.

The technical scheme of the invention has the beneficial effects that:

can realize the more complete filtration of the blood of aortic arch position in the TAVR art, block that the thrombus piece passes through the aortic arch, receive and release the convenience simultaneously, promote operation efficiency.

Drawings

To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of a thrombus filtering and removing net according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of an exemplary embodiment of an extra-filter screen;

FIG. 3 is a schematic view of the thrombus filtering and removing net according to the preferred embodiment of the present invention after removing the outer filtering net;

in the figure: 1. an outer filter screen; 11. a proximal end opening; 12. a distal end opening; 2. a guide strip; 3. an inner elastic filter screen; 31. a large telecentric end; 32. proximal to the small orifice end; 4. a proximal support frame; 5. a telecentric support frame; 6. the sheath tube is accommodated.

Detailed Description

The terms "invention", "invention" and "invention" as used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claims that follow. Furthermore, this specification does not intend to describe or limit the subject matter covered by any claims of any particular component, paragraph, statement or drawing of this application. The subject matter should be understood with reference to the entire specification, all drawings, and any claims that follow. The invention is capable of other embodiments and of being practiced or of being carried out in other ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.

The details of the invention will now be discussed with reference to the accompanying drawings, which illustrate the invention by way of example only. In the drawings, similar features or components may be denoted by the same reference numerals.

The use of "including," "comprising," or "having" and "including" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Although reference may be made in describing the drawings to the following directions, such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., for convenience, reference is made with respect to the drawings. These directions are not intended to literally accept or limit the present invention in any manner. Moreover, terms such as "first," "second," "third," and the like are used herein for purposes of description and are not intended to indicate or imply importance or significance.

The main design idea of the invention is as follows: on one hand, the filtering effect is improved through the overlapping structure of the inner and outer filtering nets, and the adaptive structural design of the inner and outer filtering nets and the supporting auxiliary structural design at the two ends of the outer filtering net are matched; on the other hand, the proximal end and the distal end bead of outer filter screen strut to enclose and design the compression auxiliary structure for when outer filter screen retrieves to get into and accomodates the sheath pipe, outer filter screen proximal end and distal end strut to enclose and get into and accomodate the sheath pipe recovery resistance drop to minimumly (or, the proximal end or the distal end bead of outer filter screen strut to enclose and design the compression auxiliary structure, outer filter screen proximal end or distal end strut to enclose and get into and accomodate the sheath pipe when retrieving the resistance drop to minimumly), bear great stress when retrieving in order to avoid each structure.

Referring to fig. 1, 2 and 3, the thrombus filtering and removing net of the present invention comprises an outer filtering net 1 and a guide bar 2, wherein the outer filtering net 1 is tubular and has a proximal end opening 11 and a distal end opening 12. The proximal end opening 11 is provided with a proximal support frame 4, the distal end opening 12 is provided with a distal support frame 5, and the support frames are arranged at the two ends of the external filter screen 1 to expand the two ends of the filter screen and attach to the vessel wall.

The side of nearly heart support frame 4 and far heart support frame 5 is connected to gib block 2 respectively, specifically, the side of nearly heart support frame 4 and far heart support frame 5 is perpendicular to connection to the lateral wall of pipy gib block 2 respectively for the outer filter screen 1 that expandes can wholly be obeyed in gib block 2 and extend along it, thereby can reduce the setting of outer filter screen support rib.

The guide strip 2 is sleeved with a containing sheath tube 6. In the process that the accommodating sheath tube 6 moves from the far-center end to the near-center end along the guide strip 2, the outer filter screen 1, the far-center support frame 5 and the near-center support frame 4 sequentially enter the accommodating sheath tube 6 until being completely accommodated.

Referring to fig. 3, in a further embodiment, the thrombus filtering and removing net further comprises an inner elastic filtering net 3, the inner elastic filtering net 3 is funnel-shaped and has a large telecentric opening end 31 and a small telecentric opening end 32, and the large telecentric opening end 31 of the inner elastic filtering net 3 is connected with the telecentric support frame 5 in a surrounding manner. The proximal, reduced diameter end 32 of the inner flexible filter web 3 faces the interior of the outer filter web 1. Surgical instruments enter and exit through the proximal small end 32 of the funnel-shaped inner flexible filter screen 3 during the surgical procedure.

Accomodate sheath pipe 6 and move the in-process from distal end to proximal end along gib block 2, outer filter screen 1 and telecentric support frame 5, interior elasticity filter screen 3 and proximal support frame 4 get into in proper order accomodate sheath pipe 6 until being accomodate completely.

Through the arrangement of the inner elastic filter screen 3, the thrombus filtering and removing screen can not only protect the cerebral vessels, but also remove certain thrombus from the blood in the flowing direction of the aortic arch of the human body; the funnel shape reserves a smooth passage with a small near-center opening for the arterial blood flow during filtering to avoid blockage, and the filtered thrombus is guided and reserved to the included angle between the outer filter screen and the inner elastic filter screen through the funnel wall, so that the problem that thrombus blocks are washed to the artery due to 'no filtering' is avoided.

In the preferred embodiment of the support frame, the proximal support frame 4 and the distal support frame 5 are ring bodies made of shaping wires, or the proximal support frame 4 or the distal support frame 5 are ring bodies made of shaping wires (preferably, the proximal support frame 4 and the distal support frame 5 are both ring bodies made of shaping wires), and the shrinkage and extension characteristics of the shaping wires can well meet the self-deformation requirements of the two support frames.

In other preferred embodiments of the support frame, the proximal support frame 4 and the distal support frame 5 are ring bodies made of elastic hoses, or the proximal support frame 4 or the distal support frame 5 are ring bodies made of elastic hoses (preferably, the proximal support frame 4 and the distal support frame 5 are both ring bodies made of elastic hoses), and the ring bodies become larger when the elastic hoses are full and become smaller when the elastic hoses are empty. The expansion is carried out through the air/liquid filling hose, and the recovery is carried out through the air/liquid emptying hose.

Further, one side of the proximal region and one side of the distal region of the guide strip 2 are open, and the proximal support frame 4 and the distal support frame 5 are reduced in volume outside the guide strip 2 and are at least partially received in the guide strip 2; alternatively, the proximal region or the distal region of the guide bar 2 is open on one side, and the proximal support frame 4 or the distal support frame 5 is reduced in volume outside the guide bar 2 and is at least partially received in the guide bar 2 (most preferably, the proximal end and the distal end of the guide bar 2 are open on one side).

The guide strip 2 is here referred to as having a space within its opening to accommodate a proximal support 4 and/or a distal support 5, either compressed or uncompressed. The specific opening can be designed as one, or the opening can be designed correspondingly for the proximal support frame 4 and the distal support frame 5 respectively; generally, when the openings are designed separately, most of the outer filter net 1 is still outside the guide bar 2 after the storage is completed.

In the preferred embodiment of the support frame entering the guide bar 2, the side parts of the proximal support frame 4 and the distal support frame 5 enter the inner cavity of the guide bar 2 from the opening of the guide bar 2, and when the side parts of the proximal support frame 4 and the distal support frame 5 are pulled, the volumes of the proximal support frame 4 and the distal support frame 5 outside the guide bar 2 are reduced and at least partially (optimally, completely) are collected into the guide bar 2; or, the side edge part of the proximal support frame 4 or the distal support frame 5 enters the inner cavity of the guide bar 2 from the opening of the guide bar 2, and when the side edge part of the proximal support frame 4 or the distal support frame 5 is pulled, the volume of the proximal support frame 4 or the distal support frame 5 outside the guide bar 2 is reduced and at least partially (optimally, completely) is retracted into the guide bar 2. When the proximal support frame 4 and the distal support frame 5 are ring bodies formed by shaping wires, the side edges of the proximal support frame 4 and the distal support frame 5 are partially one end or two ends of the shaping wires; or, when the proximal support frame 4 or the distal support frame 5 is a ring body formed by the shaping wire, the side edge of the proximal support frame 4 or the distal support frame 5 is partially one end or two ends of the shaping wire. It will be appreciated that if there is no compression requirement, the ends of the set wires of the support frame (the spreader rings) may be secured to the side walls of the structure of the gib 2.

In other preferred embodiments of the entry of the support frame into the guide strip 2, a winding spindle is provided in the guide strip 2, which in the preferred embodiment extends in the axial direction of the guide strip 2. The side edge parts of the proximal support frame 4 and the distal support frame 5 are fixedly connected to the winding rotating shaft, and when the side edge parts of the proximal support frame 4 and the distal support frame are wound, the volumes of the proximal support frame 4 and the distal support frame 5 outside the guide strip 2 are reduced and at least part (optimally all) of the proximal support frame and the distal support frame are collected into the guide strip 2; or, the side edge part of the proximal support frame 4 or the distal support frame 5 is fixedly connected to the winding rotating shaft, and when the side edge part of the proximal support frame 4 or the distal support frame is wound, the volume of the proximal support frame 4 or the distal support frame 5 outside the guide bar 2 is reduced and at least part (preferably all) of the proximal support frame or the distal support frame is retracted into the guide bar 2. The rotation of the winding spindle can be either manual or controlled by an external instrument.

When the sheath pipe 6 is accomodate in the entering of outer filter screen recovery, the nearly heart end of outer filter screen and far-heart end strut the circle and get into when accomodating sheath pipe 6 make the recovery resistance fall to minimum through above-mentioned structure, perhaps, the nearly heart end of outer filter screen or far-heart end strut the circle and get into when accomodating sheath pipe 6 make the recovery resistance fall to minimum through above-mentioned structure to avoid each structure to bear great stress when retrieving.

The outer filter screen 1 is in a taper pipe shape with a large proximal end diameter (the diameter is preferably 22 mm) and a small distal end diameter (the diameter is preferably 18 mm), so that the outer filter screen is more adaptive to the inner diameter of a blood vessel. The proximal support frame 4 and the distal support frame 5 are respectively set to be suitable for the corresponding size of the outer filter screen 1. Further, outer filter screen 1 is flexible pellicle and outer filter screen 1's the proximal end of turning over the back inwards and wraps fixed proximal support frame 4. Through the close heart support frame 4 of cladding, avoid the stress injury to the vascular wall, guarantee flexible semipermeable membrane's laminating simultaneously.

Generally, the inner elastic filtering net 3 may be woven of elastic wires, but the present invention is not limited thereto. The proximal end of the outer filter screen 1 is not easy to be collected into the sheath pipe due to the arrangement of the double filter screens, and is not easy to be completely unfolded due to the friction in the sheath pipe in the unfolding process, and the difficulty of stretching and collecting can be reduced by adopting independent elastic wires to weave without being attached to a semipermeable membrane.

The surface of the inner elastic filter screen 3 can be attached with a semipermeable membrane so as to increase the arterial thrombus blocking efficiency under the condition of operation requirement, and the mesh density can also be increased so as to provide proper rigidity for the funnel shape while ensuring certain blocking efficiency; if the membrane is not coated, the inner elastic filter screen 3 can be designed to be closely woven so as to reduce the weaving gap. The aperture of outer filter screen 1 uses 0.05mm as fitting, and the aperture of interior elastic filter screen 3 uses 0.5mm as fitting, and the thrombus filters the aperture size of cleaing away net each department and can adjust according to actual need, and wherein outer filter screen 1 sets up little aperture and mainly provides the filtration guarantee as far as for cerebrovascular, and interior elastic filter screen 3 sets up the large aperture and then is convenient whole accomodating under the prerequisite of guaranteeing thrombus collection efficiency.

In operation, with continued reference to the drawings, when the thrombus filtering and removing net of the present invention is placed in a human body, the end of the sheath tube 6 is placed at the aortic arch position of the human body. Withdraw the relative gib block 2 of sheath pipe 6 of accomodating of outer filter screen 1 after the cladding compression earlier, the outer filter screen 1 exposes out in the process, prop open the circle with the fixed both ends of outer filter screen 1 simultaneously and strut respectively automatically or under control, thereby make outer filter screen 1, the attached location of gib block 2 is to human aortic arch position and shelter from the brachium futilely, left common carotid artery, artery under the left clavicle, whole outer filter screen 1 looks like the wind vane's string bag this moment, the interior elasticity filter screen 3 of hourglass hopper-shaped stretches out in to the string bag naturally. Surgical instrument passes in and out through the proximal small port end 32 of the funnel-shaped inner elastic filter screen 3 in the operation process, and the funnel-shaped inner elastic filter screen 3 is attached to the surface of the surgical instrument by elasticity, so that large thrombus blocks can be prevented from leaking, and the thrombus blocks are contained near the bottom of the inner elastic filter screen 3.

After the operation is finished, the process of recovering the filtering device comprises the following steps: contract first nearly heart support frame 4 (nearly heart end struts the circle), in order to avoid the thrombus piece to flow backward, relative gib block 2 is advanced to push away and is accomodate sheath pipe 6, make far heart support frame 5 (far heart end strut the circle) and its upper accessory structure accomodate into the sheath pipe after accomodating the mouth of pipe department compressive deformation of sheath pipe 6, accomodate sheath pipe 6 and advance slowly forward, slowly compress outer filter screen 1 until accomodating into the sheath with nearly heart support frame 4 (nearly heart end struts the circle) is complete, whole in-process thrombus filters and clears away that the interior pressure disturbance is less and nearly heart support frame 4 (nearly heart end struts the circle) shrink to minimum or even seal, consequently the thrombus leaks the risk and is low. After the whole operation is completed, the accommodating sheath tube 6 is withdrawn out of the body with the content of the accommodating sheath tube, and the operation is completed.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a thrombus filters clears away net, characterized in that, includes outer filter screen (1) and gib block (2), outer filter screen (1) is the tubulose and has nearly heart end opening (11) and far-heart end opening (12), nearly heart end opening (11) are equipped with nearly heart support frame (4), far-heart end opening (12) are equipped with heart far away support frame (5), the side of nearly heart support frame (4) and heart far-heart support frame (5) is connected to gib block (2) respectively, gib block (2) overcoat is equipped with accomodates sheath pipe (6); in the process that the accommodating sheath tube (6) moves from a far center end to a near center end along the guide strip (2), the outer filter screen (1), the far center support frame (5) and the near center support frame (4) thereof sequentially enter the accommodating sheath tube (6) until being completely accommodated; the opening of one side of the area of nearheart and/or the telecentric region of gib block (2), the side of nearheart support frame (4) and/or telecentric support frame (5) is from the opening of gib block (2) is got into the inner chamber of gib block (2), when drawing the side of nearheart support frame (4) and/or telecentric support frame (5) is local, the volume of nearheart support frame (4) and/or telecentric support frame (5) outside gib block (2) is reduced and at least partially taken in the gib block (2).

2. The thrombus filtering and removing net according to claim 1, further comprising an inner elastic filter screen (3), wherein the inner elastic filter screen (3) is funnel-shaped and has a large telecentric opening end (31) and a small telecentric opening end (32), and the large telecentric opening end (31) of the inner elastic filter screen (3) is connected with the telecentric support frame (5) in a surrounding manner; accomodate sheath pipe (6) along guide bar (2) remove the in-process from far away heart end to nearly heart end, outer filter screen (1) and its far away heart support frame (5) interior elasticity filter screen with it gets into in proper order to be close to heart support frame (4) accomodate in sheath pipe (6) until being accomodate completely.

3. The thrombus filter screen according to claim 2, wherein the inner elastic filter screen (3) is woven from elastic filaments.

4. The thrombus filter removal screen according to claim 3, wherein a semi-permeable membrane is attached to the surface of the inner elastic filter screen (3).

5. The thrombus filtering and removing net according to claim 2, 3 or 4, wherein the pore size of the outer filtering net (1) is 0.05mm, and the pore size of the inner elastic filtering net (3) is 0.5mm.

6. The thrombus filtration removal screen of claim 1, wherein the proximal support frame (4) and/or the distal support frame (5) is a loop body composed of a shaped wire.

7. The thrombus filter removal screen of claim 1, wherein the proximal support frame (4) and/or the distal support frame (5) is a ring body formed by an elastic tube, wherein the ring body is enlarged when the elastic tube is inflated and the ring body is reduced when the elastic tube is deflated.

8. The thrombus filtering and removing net according to claim 1, wherein the outer filter net (1) is in a tapered tubular shape with a large proximal diameter and a small distal diameter.

9. The thrombus filtering and removing net according to claim 1 or 8, wherein the outer filtering net (1) is a flexible semi-permeable membrane, and the proximal end of the outer filtering net (1) is folded inwards and then fixed to the proximal supporting frame (4).

10. The thrombus filtering and removing net is characterized by comprising an outer filter screen (1) and a guide strip (2), wherein the outer filter screen (1) is tubular and is provided with a proximal end opening (11) and a distal end opening (12), the proximal end opening (11) is provided with a proximal support frame (4), the distal end opening (12) is provided with a distal support frame (5), the side edges of the proximal support frame (4) and the distal support frame (5) are respectively connected to the guide strip (2), and a containing sheath tube (6) is sleeved outside the guide strip (2); in the process that the accommodating sheath tube (6) moves from a far center end to a near center end along the guide strip (2), the outer filter screen (1), the far center support frame (5) and the near center support frame (4) sequentially enter the accommodating sheath tube (6) until being completely accommodated; the utility model discloses a guide bar, including the gib block, the side opening of the nearly heart region of gib block (2) and/or telecentric region, be equipped with the coiling pivot in gib block (2), nearly heart support frame (4) and/or the local fixed connection in side of telecentric support frame (5) to the coiling pivot, is coiling nearly heart support frame (4) and/or when the side of telecentric support frame (5) is local, nearly heart support frame (4) and/or telecentric support frame (5) are in the volume reduction outside gib block (2) and at least part is taken in gib block (2).

11. The thrombus filtering and removing net according to claim 10, further comprising an inner elastic filter net (3), wherein the inner elastic filter net (3) is funnel-shaped and has a large telecentric opening end (31) and a small telecentric opening end (32), and the large telecentric opening end (31) of the inner elastic filter net (3) is connected with the telecentric support frame (5) in a surrounding manner; accomodate sheath pipe (6) along guide bar (2) remove the in-process from far away heart end to nearly heart end, outer filter screen (1) and its far away heart support frame (5) interior elasticity filter screen with it gets into in proper order to be close to heart support frame (4) accomodate in sheath pipe (6) until being accomodate completely.

12. The thrombus filter screen according to claim 11, wherein the inner elastic filter mesh (3) is woven from elastic filaments.

13. The thrombus filter removal screen of claim 12, wherein a semi-permeable membrane is attached to the surface of the inner elastic filter screen (3).

14. The thrombus filter-removal screen according to claim 11, 12 or 13, wherein the outer filter mesh (1) has a pore size of 0.05mm, and the inner elastic filter mesh (3) has a pore size of 0.5mm.

15. The thrombus filtration removal screen of claim 10, wherein the proximal support frame (4) and/or the distal support frame (5) is a loop body composed of a shaping wire.

16. The thrombus filter screen according to claim 10, wherein the proximal support frame (4) and/or the distal support frame (5) is a ring body formed of an elastic tube that becomes larger when inflated and smaller when deflated.

17. The thrombus filter removal screen according to claim 10, wherein the outer filter mesh (1) has a tapered tubular shape with a large proximal diameter and a small distal diameter.

18. The thrombus filtering and removing net according to claim 10 or 17, wherein the outer filter net (1) is a flexible semipermeable membrane and the proximal end of the outer filter net (1) is turned inwards and then wrapped and fixed around the proximal support frame (4).