CN214712932U

CN214712932U - Self-releasing thrombus filtering device

Info

Publication number: CN214712932U
Application number: CN202023100478.1U
Authority: CN
Inventors: 张珊; 唐烈; 谢鹏; 高成; 陆剑锋; 阮希鸣
Original assignee: Polyrey Medical Tech Suzhou Co ltd
Current assignee: Polyrey Medical Tech Suzhou Co ltd
Priority date: 2020-09-30
Filing date: 2020-12-21
Publication date: 2021-11-16
Anticipated expiration: 2030-12-21
Also published as: CN112546323A; CN112546323B

Abstract

The utility model relates to a thrombus filter equipment from release mainly can include: a filter, an operating rod and a catheter sheath; a filter member having filter pores; the blood and thrombus in the blood can enter the filter element, the filter element can filter the thrombus in the blood and make the thrombus stay in the filter element, and the blood after filtering the thrombus flows out of the filter element through the filter holes; the filtering piece is provided with a guide hole for guiding the guide wire to pass through; the operating rod is fixed at one end of the filter piece.

Description

Self-releasing thrombus filtering device

Technical Field

The utility model belongs to the technical field of medical instrument, concretely relates to thrombus filter equipment from release.

Background

The blood agglutinin is formed on the surface of the desquamated or repaired part of the cardiovascular intima, and mainly comprises insoluble fibrin deposited platelets, white blood cells, red blood cells and viscous components in blood. These components are caused by damage to the intima of the blood vessels, degenerative necrosis of endothelial cells, activation of the intrinsic coagulation system and subsequent activation of the extrinsic coagulation system, and the damaged intima predisposes platelets to aggregation. With the change in blood flow velocity and the increase in blood viscosity, thrombosis is more likely to form. After thrombosis, blood supply to important organs, such as brain and heart, is blocked, which has an effect on the immediate or long-term prognosis of patients.

The phenomenon of blood-insoluble abnormal substances appearing in circulating blood traveling with the blood flow to the distant site to block the lumen of a blood vessel is called embolism, and substances blocking the blood vessel are called emboli. Among the embolization phenomena, embolization by detached thromboembolism is most common, such as embolization of pulmonary, cerebral, coronary, and peripheral arteries.

In the vascular interventional therapy operation, a guide wire is used, and almost all patients have thrombus shedding at the narrow lesion. Thrombus shedding can cause embolism of distant blood vessels, and serious diseases occur. At present, the solution is to implant most of the thrombus filter devices made of nickel-titanium memory metal into the inner wall of the blood vessel to filter the thrombus. However, if the mechanical stability of the thrombus filter device implanted into a blood vessel is not sufficient, the thrombus filter device may move, deform, break or even fall apart after long-term use, thereby causing serious medical accidents.

Therefore, there is a need for a device that can filter out thrombus falling from blood without implanting into blood vessels, so as to improve the success rate of blood vessel intervention surgery.

Disclosure of Invention

The utility model aims at providing a need not to implant the blood vessel, just can guarantee the blood circulation, effectively filters the thrombus filter equipment of releasing certainly of the thrombus in the blood.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a self-releasing thrombus filtration device consisting essentially of: filter, action bars and pipe sheath.

A filter member having filter pores. The thrombus in blood and the blood can get into and filter the piece in, filter the thrombus that can filter in the blood and make the thrombus stop to filter in the piece, filter the blood after the thrombus and flow out in the piece from filtering by the filtration pore. The filtering piece is provided with a guide hole for guiding the guide wire to pass through.

The operating rod is fixed at one end of the filter piece.

The catheter sheath is sleeved outside the operating rod and can move along the length direction of the operating rod so as to release the filter element to the outside of the catheter sheath or retract the filter element into the catheter sheath. After the filter element is released out of the catheter sheath or withdrawn into the catheter sheath, the catheter sheath can be fixed on the operating rod.

The filter element is provided with a guide hole for guiding the guide wire to pass through, so that the self-releasing thrombus filter device is matched with the guide wire to use; the filter can be withdrawn into the catheter sheath or released out of the catheter sheath, and after the filter is released out of the catheter sheath or withdrawn into the catheter sheath, the catheter sheath can be fixed on the operating rod so as to prevent the catheter sheath from sliding; the arrangement of the operating rod facilitates the pushing or the withdrawing of the filtering piece. In the thrombus filter equipment from release need not implant the blood vessel, in the thrombus filter equipment from release can enter into the blood vessel, filters the thrombus from blood to make filterable thrombus stop and filter in the piece, will carry the thrombus in filtering the piece from the thrombus filter equipment of release again and take out from the blood vessel can. The thrombus filter equipment who releases certainly can filter the thrombus that drops in the blood under the prerequisite of guaranteeing the blood circulation to promote the success rate of vascular intervention operation. The self-releasing thrombus filtering device has the advantages of simple releasing mechanism, easy operation, no interference to the operation of other surgical instruments in the operation, capability of being withdrawn after short-time application, difficult influence on normal blood flow and difficult secondary thrombus formation.

In some embodiments of the present invention, a handle is fixedly disposed at an end of the operating rod away from the filtering member.

The arrangement of the handle is convenient for a user to push or withdraw the filter element.

In some embodiments of the present invention, the proximal end of the catheter sheath has a first locking portion; the thrombus filtering device also comprises a locking piece which can be rotatably sleeved on the first locking part around the axis of the thrombus filtering device and can slide on the operating rod along with the catheter sheath; the handle is provided with a second locking part; a first matching part which can be matched and locked with the first locking part and a second matching part which can be matched and locked with the second locking part are formed on the locking part; when the first locking part and the first matching part are matched and locked, the first locking part is tightly matched with the operating rod so that the catheter sheath and the operating rod are relatively fixed; when the second locking part and the second matching part are matched and locked, the filter piece is locked in a state of being released to the outside of the catheter sheath.

In some specific and preferred embodiments, the first locking portion comprises a first portion and a second portion which are separated, the first portion and the second portion are arranged in a circular shape and are sleeved on the operating rod, and external threads are respectively formed on the outer surfaces of the first portion and the second portion; internal threads capable of being matched with the external threads are arranged at partial positions in the circumferential direction of the first matching part, and the rest positions are smooth surfaces; when the first locking part and the first matching part are matched and locked, the external thread and the internal thread are matched to enable the first part and the second part to be close to each other; the internal threads are disengaged from at least the external threads on the first portion or the second portion when the first locking portion and the first mating portion are unlocked.

In some specific and preferred embodiments, the second locking part is provided with an external thread, and the second mating part is formed with an internal thread matching the external thread on the second locking part.

The arrangement of the first locking part, the second locking part and the locking part can lock the catheter sheath at any position of the operating rod, so that the distance of the filter element extending out of the catheter sheath is controlled or the filter element is locked in a state of being furled in the catheter sheath, and safety accidents caused by misoperation of the operating rod can be avoided.

In some embodiments of the present invention, the filter member is in the shape of a hood, and the filter member has an opening for allowing blood and thrombus in the blood to enter.

The filtering piece in the shape of a hood can contain more thrombus and is convenient to withdraw the filtering piece into the catheter sheath.

In some embodiments of the present invention, the outer surface of the filter member is smooth and round, and the opening is inclined.

The outer surface of the filter element is smooth and mellow, so that the filter element is not easy to damage blood vessels. The opening slope sets up, and the thrombus that holds that can the at utmost flows in, improves and filters the effect that filters the thrombus.

In some embodiments of the present invention, the filter member includes a membrane having a shape memory, and the membrane has pores.

In some embodiments of the present invention, the material of the film is one or more of epoxy resin, polyurethane, or carbon fiber composite.

In some embodiments of the present invention, the filter further includes a plurality of support members, and the support members are made of a metal material with shape memory. The film covers the surface of the support.

The utility model discloses an in some embodiments, it is a plurality of support piece along the thrombus filters the axial distribution of piece, and works as when the thrombus filters piece and is in the expansion state, it is a plurality of phase separation between the support piece, support piece's setting makes to filter the maintenance expansion state that can be fine in the blood vessel to the better entering of blood filters the piece, and, support piece has avoided filtering a piece and has produced the closed angle along the axial distribution of filtering a piece, when guaranteeing to filter and have sufficient holding power, has improved the security performance, has avoided filtering the damage of piece to the vascular wall.

In some embodiments of the present invention, the supporting member is sinusoidal.

The support piece is in a sine wave shape, so that the structural stability is good, the breakage is not easy, and the release and the retraction of the filter piece are easy.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

in the thrombus filter equipment from release need not implant the blood vessel, in the thrombus filter equipment from release can enter into the blood vessel, filters the thrombus from blood to make filterable thrombus stop and filter in the piece, will carry the thrombus in filtering the piece from the thrombus filter equipment of release again and take out from the blood vessel can. The self-releasing thrombus filtering device has the advantages of simple releasing mechanism, easy operation, no interference to the operation of other surgical instruments in the operation, capability of being withdrawn after short-time application, difficult influence on normal blood flow and difficult secondary thrombus formation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a filter element provided in an embodiment of the present invention before release;

fig. 2 is a schematic structural view of the filter element according to the embodiment of the present invention after release and before deployment;

fig. 3 is a schematic structural view of the filter member according to the embodiment of the present invention after being unfolded;

fig. 4 is a schematic structural view of a filter element provided by an embodiment of the present invention in a blood vessel;

fig. 5 is a schematic structural diagram of a film according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a supporting member according to an embodiment of the present invention.

Wherein: 100-self-releasing thrombus filter, 110-filter, 111-guide hole, 113-opening, 115-support, 117-membrane, 130-lever, 131-handle, 132-first locking portion, 1321-protrusion, 1322-first portion, 1323-second portion, 1324-external thread, 133-first mating portion, 1331-internal thread, 1332-smooth surface, 135-second locking portion, 150-catheter sheath, 151-locking member, 300-guide wire, 500-vessel, 510-thrombus.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

In the description of the embodiments of the present invention, it should be understood that the terms "length", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description of the embodiments of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as fixed or detachable connections or as an integral part; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features through another feature not in direct contact. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.

The orientation of this embodiment is defined as the orientation of the thrombus filter device when in use, with the side closer to the operator being the proximal end and the side further from the operator being the distal end.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1-6, in order to solve the technical problem that the conventional thrombus filter device needs to be implanted into a blood vessel 500 and can move, deform, break or even fall apart after long-term use, the present embodiment provides a self-releasing thrombus filter device 100. The self-releasing thrombus filtration device 100 may essentially comprise: a filter 110, a lever 130, and a catheter sheath 150.

The filter 110 includes a plurality of support members 115 and a membrane 117.

The proximal end of the membrane 117 defines an opening 113 for the blood and thrombus therein to enter the filter 110, and the membrane 117 defines a plurality of filter holes for allowing blood to flow out of the filter 110 while thrombus remains in the filter 110. Specifically, the material of the film 117 may be a material having a shape memory property, including but not limited to one or more of epoxy resin, polyurethane, or carbon fiber composite material. Preferably, the opening 113 is disposed obliquely, that is, when the filter element 110 is unfolded, the plane of the opening 113 is disposed obliquely relative to the axial direction of the filter element 110, wherein the proximal end of the opening 113 is fixedly connected to the distal end of the operating rod 130, so as to increase the area of the opening 113, thereby increasing the probability of thrombus entering the filter element 110, and further increasing the thrombus filtering effect of the filter element 110.

The number of the supporting members 115 is plural and is distributed along the axial direction of the filter member 110. Each of the supporters 115 is in a closed ring shape, and each of the supporters 115 is in a sine wave shape, when the filter element 110 is in the unfolded state, the plurality of supporters 115 are separated from each other, so that the structural stability is good, the breakage is not easy, the release and the retraction of the filter element 110 are easy, and the supporting effect is good when the filter element is unfolded.

The thin film 117 is fixedly disposed with the plurality of supporting members 115, wherein the thin film 117 may be disposed inside or outside the plurality of supporting members 115, and preferably, the thin film 117 covers the surface of the supporting members 115, so that the outer surface of the filter member 110 is smooth and rounded, and the filter member 110 is not easily damaged to the blood vessel.

In order to better spread and maintain the opening 113 of the membrane 117 in an open state, a support member 115 is provided at the opening 113.

In order to better support the support members 115 in the expanded configuration, the support members 115 are inclined relative to the axial direction of the filter members 110 by an amount that increases from the distal end to the proximal end of the filter members 110, i.e., the plane in which the support members 115 lie is inclined at an increasing angle relative to the axis of the filter members 110.

Specifically, the support 115 is made of a shape-memory metal material, such as nitinol.

Specifically, the filtering member 110 is in the shape of a hood, and the filtering member 110 in the shape of a hood can accommodate more thrombus and is convenient for withdrawing the filtering member 110 into the catheter sheath 150.

Specifically, the film 117 of the filter element 110 is provided with a guide hole 111 through which the guide wire 300 can be guided.

The filter member 110 is configured such that blood and thrombus in the blood can enter the filter member 110, the filter member 110 can filter the thrombus in the blood and make the thrombus stay in the filter member 110, and the blood after filtering the thrombus flows out of the filter member 110 through the filter holes. Support piece 115's setting makes to filter piece 110 the state of expanding that keeps that can be fine in blood vessel 500 to filter piece 110 is filtered in the better entering of blood, and, support piece 115 distributes along the axial of filtering piece 110, avoided filtering piece 110 to produce the closed angle, avoided filtering piece 110 of closed angle structure to have easy cracked problem on the one hand, when on the other hand has guaranteed that filtering piece 110 has sufficient holding power, the security performance has been improved, the damage of filtering piece to the vascular wall has been avoided. In addition, the filter element 110 of the present invention can improve the thrombus removal effect without affecting the blood flow by the support element 115 cooperating with the membrane 117 having the filter hole.

The distal end of the lever 130 is fixedly coupled to the proximal end of the opening 113 of the filter element 110.

The sheath 150 is disposed over the shaft 130, and the sheath 150 can move along the length of the shaft 130 to release the filter element 110 out of the sheath 150 or retract the filter element into the sheath 150. The sheath 150 can be secured to the lever 130 during release of the filter 110 out of the sheath 150 and withdrawal into the sheath 150.

More specifically, the guide hole 111 is located at the head (distal end) of the filter element 110, i.e., the end of the filter element 110 remote from the operation rod 130. The catheter sheath 150 and the operation rod 130 may be made of PTFE, FEP, PEBAX, or the like, so that the catheter sheath 150 and the operation rod 130 have certain strength and can pass through the curved lesion of the blood vessel 500.

Specifically, a handle 131 is fixedly provided at a distal end of the operating lever 130. The handle 131 is provided to facilitate the user's advancing and retracting of the filter element 110.

Specifically, the operation rod 130 and the catheter sheath 150 are locked by a locking device.

As shown in fig. 1 to 3, the locking means comprises a locking member 151 that can slide on the operating rod 130 together with the catheter sheath 150.

The locking device further comprises a first locking part 132 arranged at the proximal end of the catheter sheath 150, a first matching part 133 formed at the distal end of the locking element 151 and capable of matching and locking with the first locking part 132; when the first locking portion 132 and the first mating portion 133 are mated and locked, the first locking portion 132 mates with the operating rod 130 to fix the catheter sheath 150 relative to the operating rod 130, so that the catheter sheath 150 can be locked at any position of the operating rod 130, and the filter 110 can stay at any position relative to the catheter sheath 150.

The locking member 151 can be rotatably fitted around its axis on the first locking portion 132. Further, a protrusion 1321 is formed on the first locking portion 132 to protrude outward, and a distal end surface of the distal end of the locking element 151 can be engaged with the protrusion 1321 to prevent the locking element 151 from being disengaged from the first locking portion 132 when the locking element 151 slides together with the catheter sheath 150 on the operating rod 130.

Specifically, the first locking portion 132 includes a first portion 1322 and a second portion 1323 which are separated, the first portion 1322 and the second portion 1323 are rounded and are fitted over the lever 130, i.e., a gap is formed between the first portion 1322 and the second portion 1323, so that when the first locking portion 132 and the first mating portion 133 are in an unlocked state, the gap between the first portion 1322 and the second portion 1323 is large, the first locking portion 132 is loosely fitted over the lever 130, and at this time, the locking member 151 and the catheter sheath 150 can slide together on the lever 130; when the first locking part 132 and the first fitting part 133 are fitted and locked, the gap between the first part 1322 and the second part 1323 becomes smaller, and the first locking part 132 is tightly fixed to the lever 130, at which time, the frictional force increases so that the locking member 151 and the catheter sheath 150 cannot slide on the lever 130, thereby performing a locking function.

Specifically, external threads 1324 are formed on the outer surfaces of the first portion 1322 and the second portion 1323, respectively; a part of the first engagement portion in the circumferential direction is provided with an internal thread 1331 engageable with the external thread 1324, and the remaining part is a smooth surface 1332. So that the external threads 1324 cooperate with the internal threads 1331 to draw the first portion 1322 and the second portion 1323 together when the first locking portion 132 and the first mating portion 133 are mated and locked; when the locking member 151 is rotated to unlock the locking device, the internal threads 1331 are disengaged from at least the external threads 1324 of the first portion 1322 or the second portion 1323, and at this time, the first portion 1322 and the second portion 1323 are moved away from each other to unlock the device.

Preferably, the first locking portion 132 tapers in cross-section from the distal end to the proximal end.

Specifically, the locking device further includes a second locking portion 135 formed on the handle 131, and a second fitting portion 134 formed on the locking member 151 and capable of fitting-locking with the second locking portion 135. The second locking portion 135 is an external thread, and the second fitting portion 134 is an internal thread matching the external thread. When the second locking portion 135 is locked in cooperation with the second fitting portion 134, the filter element 110 can be locked at the farthest position extending out of the catheter sheath 150. Further, integrating the second locking portion 135 and the handle 131 together facilitates a miniaturized design of the self-releasing thrombus filtration device 100.

The working principle of the self-releasing thrombus filter device 100 is:

before release of the filter element 110: the distal end of the lever 130 is inside the catheter sheath 150 and the handle 131 and the proximal end of the lever 130 are outside the catheter sheath 150. The catheter sheath 150 can be secured to the operating rod 130 by tightening the first locking portion 132 and the first mating portion 133 to prevent relative sliding between the catheter sheath 150 and the operating rod 130.

The releasing filter 110: the locking member 151 is unscrewed, the catheter sheath 150 is moved, the filter element 110 is extended out of the catheter sheath 150 to a proper position, and the locking member 151 is screwed again, so that the first locking portion 132 and the first fitting portion 133 are fitted and locked. When the filter element 110 is extended to the most distal position, the second fitting portion 134 of the locking member 151 is fitted with the second locking portion 135 of the handle 131, and the second locking portion 135 is externally threaded to fix the catheter sheath 150.

When filter 110 is in vessel 500 after release: referring to fig. 4, the filter element 110 is used in conjunction with the guide wire 300 during the vascular intervention, i.e., the guide wire 300 is passed through the guide hole 111 at the head of the filter element 110. The detached thrombus 510 flows through the filter member 110 with the blood (the direction of the arrow shown in fig. 4 is the direction of the blood flow), particles of the thrombus 510 are intercepted, and normal blood freely passes through the filter member 110. After the thrombus 510 is filtered, the locking member 151 is unscrewed from the second locking portion 135, and the introducer sheath 150 is pushed, so that the filter element 110 can be withdrawn into the introducer sheath 150.

The self-releasing thrombus filter device 100 does not need to be implanted into the blood vessel 500, the self-releasing thrombus filter device 100 can enter the blood vessel 500, filter the thrombus 510 from the blood, make the filtered thrombus 510 stay in the filter member 110, and then take the self-releasing thrombus filter device 100 out of the blood vessel 500 with the thrombus 510 in the filter member 110. The self-releasing thrombus filtering device 100 can filter thrombus 510 falling from blood on the premise of ensuring blood circulation, so as to improve the success rate of blood vessel interventional surgery. The self-releasing thrombus filtering device 100 has the advantages of simple release mechanism, easy operation, no interference to the operation of other surgical instruments in the operation, capability of being withdrawn after short-time application, difficulty in influencing normal blood flow, difficulty in causing secondary thrombus formation and the like.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-releasing thrombus filtration device, comprising:

a filter element having filter pores to allow blood to pass through the filter element while thrombus remains within the filter element; the filter piece is provided with a guide hole for guiding a guide wire to pass through;

an operating rod, the filter element being fixed to a distal end of the operating rod;

the catheter sheath is sleeved outside the operating rod and can move along the length direction of the operating rod so as to release the filter element to the outside of the catheter sheath or retract the filter element into the catheter sheath; after the filter element is released out of the catheter sheath or withdrawn into the catheter sheath, the catheter sheath can be fixed on the operating rod.

2. The self-releasing thrombus filter device according to claim 1, wherein a handle is fixed to a proximal end of the operating rod.

3. The self-releasing thrombus filter device of claim 2 wherein the proximal end of the catheter sheath has a first locking portion; the thrombus filtering device also comprises a locking piece which can be rotatably sleeved on the first locking part around the axis of the thrombus filtering device and can slide on the operating rod along with the catheter sheath; the handle is provided with a second locking part; a first matching part which can be matched and locked with the first locking part and a second matching part which can be matched and locked with the second locking part are formed on the locking part; when the first locking part and the first matching part are matched and locked, the first locking part is tightly matched with the operating rod so that the catheter sheath and the operating rod are relatively fixed; when the second locking part and the second matching part are matched and locked, the filter piece is locked in a state of being released to the outside of the catheter sheath.

4. The self-releasing thrombus filter device according to claim 3, wherein the first locking portion comprises a first portion and a second portion separated from each other, the first portion and the second portion being rounded and fitted over the operating rod, the first portion and the second portion having external threads formed on outer surfaces thereof, respectively; internal threads capable of being matched with the external threads are arranged at partial positions in the circumferential direction of the first matching part, and the rest positions are smooth surfaces; when the first locking part and the first matching part are matched and locked, the external thread and the internal thread are matched to enable the first part and the second part to be close to each other; the internal threads separate from at least the external threads on the first or second portions when the first locking portion and the first mating portion are unlocked; and/or the presence of a gas in the gas,

the second locking portion is provided with an external thread, and the second matching portion is provided with an internal thread matched with the external thread on the second locking portion.

5. The self-releasing thrombus filter device according to claim 1, wherein the filter member is in the shape of a hood, the filter member having openings for the entry of blood and thrombus therein.

6. The self-releasing thrombus filter device according to claim 5, wherein the outer surface of the filter member is smooth and rounded, and the openings are obliquely arranged.

7. The self-releasing thrombus filter device according to any one of claims 1-6, wherein the filter comprises a membrane having shape memory, the membrane having pores.

8. The self-releasing thrombus filter device according to claim 7, wherein the membrane is made of epoxy, polyurethane or carbon fiber composite.

9. The self-releasing thrombus filter device according to claim 7, wherein the filter member further comprises a plurality of support members distributed along an axial direction of the filter member and spaced apart from each other when the filter member is in the deployed state; the support piece is made of a metal material with shape memory; the film covers the surface of the support.

10. The self-releasing thrombus filter device according to claim 9, wherein each of the struts is in the shape of a closed loop, the struts being sinusoidal.