CN115607330B

CN115607330B - Vena cava filter

Info

Publication number: CN115607330B
Application number: CN202211616878.9A
Authority: CN
Inventors: 郑殿会; 于明
Original assignee: Beijing Xinyou Medical Technology Co ltd
Current assignee: Beijing Xinyou Medical Technology Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-03-21
Anticipated expiration: 2042-12-16
Also published as: CN115607330A

Abstract

The invention provides a vena cava filter, which relates to the technical field of blood embolism medical equipment, and comprises the following components: a retrieval connector, a sheath cover, a plurality of anchoring arms, and a plurality of tube sheaths; the recycling connecting piece is connected with the sheath cover and/or the tube sheaths in a sliding manner, the tube sheaths are arranged at intervals and enclose the filtering area, and the tube sheaths are respectively connected with the sheath cover; the anchoring arms penetrate through the tube sheaths in a one-to-one correspondence mode, and the anchoring arms are all connected to the recovery connecting piece. The vena cava filter provided by the invention can slide relative to the sheath cover by operating the recovery connecting piece, so that the anchoring arm is drawn to contract into the tube sheath, further, the anchoring arm and the blood vessel do not need to be concerned with growing together, the blood vessel is not scratched in the process of taking out the filter, the time from the implantation of the filter to the taking out of the filter is not limited any more, and the filter is more convenient and safer to take out.

Description

Vena cava filter

Technical Field

The invention relates to the technical field of blood embolism medical equipment, in particular to a vena cava filter.

Background

Venous Thromboembolism (VTE) refers to the formation of an intravenous blood plaque, which is commonly found in the deep veins of the lower extremities, referred to as deep vein thrombosis. There is a possibility that part of the thrombus may be detached from the site of formation, and the detached thrombus may circulate with the blood stream and may even cause pulmonary embolism. At present, the vena cava filter is mostly adopted to be placed in a lower cavity for clinically preventing pulmonary embolism, however, in order to ensure the position stability of the filter after being implanted, the filter is usually anchored on a blood vessel wall, and after being implanted for a long time, the filter grows into a whole along with the blood vessel wall, so that the filter is difficult to take out, and the risk of complications such as blood vessel bleeding, damage and even perforation caused by taking out the filter exists.

Disclosure of Invention

The invention aims to provide a vena cava filter, which solves the technical problems that the vena cava filter is limited by implantation time and the filter implanted for a long time is difficult to take out.

In a first aspect, the present invention provides a vena cava filter comprising: a retrieval connector, a sheath cover, a plurality of anchoring arms, and a plurality of tube sheaths;

the recovery connecting piece is connected with the sheath cover or the tube sheaths in a sliding mode, the tube sheaths are arranged at intervals and surround the filtering area, and the tube sheaths are connected with the sheath cover respectively;

the plurality of anchoring arms penetrate through the plurality of tube sheaths in a one-to-one correspondence mode, and the plurality of anchoring arms are all connected to the recovery connecting piece.

With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein an elastic device is installed between the recovery connector and the sheath cover;

the elastic means have a tendency to drive the retrieval connector and extend the anchoring arms outside the sheath.

With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the recycling connection includes: the hook connecting part and the limiting part are connected with the hook connecting part;

the hook connecting part passes through the sheath cover, the elastic device is installed between the limiting part and the sheath cover, and the plurality of anchoring arms 300 are respectively connected to the limiting part.

With reference to the second possible implementation manner of the first aspect, the invention provides a third possible implementation manner of the first aspect, wherein the limiting portion is provided with a plurality of protruding portions, and the plurality of anchoring arms are connected with the plurality of protruding portions in a one-to-one correspondence manner;

the plurality of tube sheaths are provided with sliding grooves, and the plurality of protruding parts are in one-to-one corresponding sliding connection with the plurality of sliding grooves.

With reference to the first aspect, the present disclosure provides a fourth possible implementation manner of the first aspect, wherein an end of the anchoring arm away from the recovery link is provided with an anchoring hook.

In combination with the fourth possible embodiment of the first aspect, the present disclosure provides a fifth possible embodiment of the first aspect, wherein the anchoring arms are elastic and have a tendency to bend away from the filtering zone;

in an anchoring state, the anchoring hook extends to the outside of the sheath and is naturally bent;

in a contracted state, the recovery connecting piece drives the anchoring arm to slide relative to the tube sheath, and the anchoring hook is contracted to the inside of the tube sheath.

With reference to the first aspect, the present invention provides a sixth possible embodiment of the first aspect, wherein the plurality of tube sheaths are respectively inclined to the outside of the filtration zone from the end connected to the recovery connection member to the end away from the recovery connection member.

In combination with the sixth possible implementation manner of the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein the tube sheaths have elasticity, so that the plurality of tube sheaths radially contract relative to the filtering zone under an external force.

With reference to the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein a plurality of filter arms are connected to the sheath cover, and the plurality of filter arms are arranged at intervals around the filter area;

the filtering arms are elastic, so that the filtering arms tend to expand and jointly enclose the filtering area.

In combination with the eighth possible implementation manner of the first aspect, the present invention provides a ninth possible implementation manner of the first aspect, wherein an end of the filter arm away from the sheath cover is provided with a straight portion;

in the natural release state, a plurality of the straight portions tend to be parallel to the insertion and extraction direction.

The embodiment of the invention has the following beneficial effects: adopt and retrieve connecting piece sliding connection in sheath lid and/or tube sheath, a plurality of tube sheaths interval sets up, and enclose and establish the filtering area, connect respectively in the sheath lid through a plurality of tube sheaths, a plurality of anchor arms pass a plurality of tube sheaths one-to-one, and a plurality of anchor arms all connect in retrieving the connecting piece, when needing to take out vena cava filter, accessible operation is retrieved the connecting piece and is slided for the sheath lid, thereby tractive anchor arm contracts to the tube sheath inside, and then needn't worry anchor arm and blood vessel grow together, it can not cause the blood vessel to be scratched to take out the filter process, and then the time that the filter was implanted to taking out is no longer restricted, it is more convenient and safety to take out the filter.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced 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 cross-sectional view of a vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 2 is an exploded view of a vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a retrieval connection for a vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of an anchoring arm and sheath of a vena cava filter provided in accordance with embodiments of the present invention;

fig. 5 is a front view of a filter arm of a vena cava filter provided in accordance with an embodiment of the present invention.

Icon: 100-recovery of the connection; 110-a hook connection; 120-a limiting portion; 121-a boss; 200-sheath cover; 300-an anchoring arm; 301-anchoring hook; 400-tube sheath; 401-a chute; 500-a filtration zone; 600-an elastic device; 700-a filter arm; 701-straight portion.

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. The physical quantities in the formula, if not individually labeled, are to be understood as basic quantities of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation or integration.

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 a specific case to those of ordinary skill in the art.

As shown in fig. 1, the vena cava filter provided by the embodiment of the present invention comprises: a retrieval connector 100, a sheath cover 200, a plurality of anchoring arms 300, and a plurality of tube sheaths 400; the recycling connecting piece 100 is slidably connected to the sheath cover 200 and/or the tube sheaths 400, a plurality of tube sheaths 400 are arranged at intervals and surround the filtering area 500, and the plurality of tube sheaths 400 are respectively connected to the sheath cover 200; the plurality of anchoring arms 300 pass through the plurality of sheaths 400 in a one-to-one correspondence, and the plurality of anchoring arms 300 are all connected to the retrieval connector 100.

After the vena cava filter is implanted, the retraction connector 100 can be manipulated to slide along the sheath cap 200 and/or the sheath 400, thereby bringing the anchoring arm 300 into extension and retraction relative to the sheath 400. In implanted use, the anchoring arms 300 are controlled to overhang relative to the sheath 400, thereby anchoring the anchoring arms 300 to the vessel wall; when the vena cava filter needs to be taken out and recovered, the anchoring arm 300 is controlled to be contracted into the tube sheath 400, so that the end part of the anchoring arm 300 does not need to be concerned about growing together with the blood vessel wall, the blood vessel is not scratched when the filter is taken out, the time from the implantation of the filter to the taking out of the filter is not limited any more, and the filter is taken out more conveniently and safely.

As shown in fig. 1 and 2, in the embodiment of the present invention, an elastic means 600 is installed between the recovery connection member 100 and the sheath cap 200; the elastic means 600 has the tendency to drive the retrieval connector 100 and extend the anchoring arms 300 outside the sheath 400.

Specifically, after the assembly is completed, the elastic device 600 is always in an elastic deformation state, so that the elastic device 600 always has the driving and recovering connection member 100 and maintains the outward extending elastic force of the anchoring arm 300. When the vena cava filter needs to be recovered, a conveyor matched with the vena cava filter can be used for pulling the recovery connecting piece 100, so as to overcome the elasticity of the elastic device 600, and the anchoring arm 300 is contracted to the inner part of the tube sheath 400, and then the recovery connecting piece 100 is pulled further, so that the vena cava filter can be recovered.

As shown in fig. 1 and 3, the recovery connection member 100 includes: a hooking connection part 110 and a stopper part 120 connecting the hooking connection part 110; the hook connection portion 110 penetrates through the sheath cover 200, so that the hook connection portion 110 can slide relative to the sheath cover 200, the elastic device 600 is installed between the limiting portion 120 and the sheath cover 200, the plurality of anchoring arms 300 are respectively connected to the limiting portion 120, the elastic force of the elastic device 600 acts on the limiting portion 120, the hook connection portion 110 slides along the through hole of the sheath cover 200, and the limiting portion 120 pushes the anchoring arms 300 to extend outwards relative to the tube sheath 400.

As shown in fig. 1, 3 and 4, the stopper 120 is provided with a plurality of protrusions 121, and a plurality of anchoring arms 300 are connected to the plurality of protrusions 121 in a one-to-one correspondence; the plurality of tube sheaths 400 are provided with sliding grooves 401, and the plurality of protrusions 121 are slidably connected to the plurality of sliding grooves 401 in a one-to-one correspondence manner.

By the sliding connection of the protrusions 121 to the sliding grooves 401, not only is the recovery connection member 100 slidable with respect to the sheath 400, but also the recovery connection member 100 can be positioned circumferentially with respect to the sheath cover 200. Further, the maximum extension dimension of the anchor arm 300 can be limited by setting the extension length of the slide groove 401 and further limiting the sliding stroke of the stopper 120 with respect to the sheath 400.

Further, the anchoring hook 301 is disposed at an end of the anchoring arm 300 away from the recovery connector 100, and when the anchoring hook 301 extends out of the sheath 400, the anchoring hook 301 can penetrate a small amount into the blood vessel wall, so as to form a stable positioning and prevent the filter from slipping or inclining relative to the blood vessel.

Further, the anchoring arms 300 are resilient and provide the anchoring hooks 301 with a tendency to bend away from the filter area 500; in the anchoring state, the anchoring hook 301 extends to the outside of the sheath 400 and is naturally bent.

In the retracted state, the retrieval connector 100 slides the anchoring arm 300 relative to the sheath 400 and retracts the anchoring hook 301 into the sheath 400.

Further, the plurality of sheaths 400 are inclined toward the outside of the filtering section 500 from the end connected to the recovery connection member 100 to the end away from the recovery connection member 100.

The anchoring hook 301 extending from the end of the sheath 400 far from the recovery connector 100 approaches the inner wall of the blood vessel as the guiding of the sheath 400, and the anchoring strength of the anchoring hook 301 on the blood vessel wall or the depth of the anchoring hook penetrating into the blood vessel wall is increased as the extending size of the anchoring hook 301 is increased.

Further, the tube sheaths 400 are resilient such that the plurality of tube sheaths 400 radially contract relative to the filter region 500 under an external force. A customized delivery device may be used to compress the plurality of sheaths 400 toward one another during implantation or retrieval to reduce the radial dimension of the filter to facilitate implantation and retrieval.

In an alternative manner, the thrombus may be intercepted by a plurality of the tube sheaths 400 by increasing the number of the tube sheaths 400. In order to avoid the damage of the blood vessel caused by the increase of the number of the anchoring arms 300, the number of the sheath 400 and the anchoring arms 300 can be reduced to two, and the plurality of filtering arms 700 are added to intercept the thrombus.

Specifically, the sheath cover 200 is connected with a plurality of filter arms 700, and the plurality of filter arms 700 are arranged around the filter area 500 at intervals; the filter arms 700 are resilient such that the plurality of filter arms 700 tend to expand and the plurality of filter arms 700 collectively enclose the filter area 500.

In the expanded state, the plurality of filter arms 700 jointly form a bulk structure, so that thrombus is intercepted, and the smooth circulation of blood flow is ensured; a custom conveyor may be used to force the plurality of filter arms 700 to converge during implantation and retrieval to reduce their overall radial dimension.

As shown in fig. 1, 2 and 5, the end of the filter arm 700 away from the sheath cover 200 is provided with a flat part 701; in the natural release state, the plurality of straight portions 701 tend to be parallel to the insertion and extraction direction Z.

Specifically, it is parallel with the blood vessel of implanting the position that plug direction Z approaches to, and many straight portions 701 can approach to and be parallel with the vascular wall and laminate in the vascular wall, and then can avoid the filter to produce the slope for the blood vessel, and then improved vena cava filter's stability and reliability.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vena cava filter, comprising: a retrieval connector (100), a sheath cap (200), a plurality of anchoring arms (300), and a plurality of tube sheaths (400);

the recovery connecting piece (100) is connected to the sheath cover (200) or the tube sheaths (400) in a sliding mode, the tube sheaths (400) are arranged at intervals and enclose a filtering area (500), and the tube sheaths (400) are connected to the sheath cover (200) respectively;

the anchoring arms (300) penetrate through the tube sheaths (400) in a one-to-one correspondence, and the anchoring arms (300) are all connected to the recovery connector (100);

an elastic device (600) is arranged between the recovery connecting piece (100) and the sheath cover (200);

the elastic means (600) have a tendency to actuate the retrieval connection (100) and extend the anchoring arms (300) outside the sheath (400).

2. Vena cava filter according to claim 1, characterized in that the recovery connection (100) comprises: a hooking connection part (110) and a limiting part (120) connected with the hooking connection part (110);

the hook connecting part (110) penetrates through the sheath cover (200), the elastic device (600) is installed between the limiting part (120) and the sheath cover (200), and the plurality of anchoring arms (300) are respectively connected to the limiting part (120).

3. The vena cava filter according to claim 2, wherein the stopper (120) is provided with a plurality of protrusions (121), and a plurality of the anchoring arms (300) are connected with a plurality of the protrusions (121) in a one-to-one correspondence;

the plurality of tube sheaths (400) are provided with sliding grooves (401), and the plurality of bosses (121) are in one-to-one corresponding sliding connection with the plurality of sliding grooves (401).

4. Vena cava filter according to claim 1, characterized in that the end of the anchoring arm (300) remote from the retrieval connector (100) is provided with an anchoring hook (301).

5. Vena cava filter according to claim 4, characterized in that the anchoring arms (300) are elastic and have a tendency to bend away from the filter area (500) towards the anchoring hooks (301);

in an anchoring state, the anchoring hook (301) extends to the outside of the sheath (400) and is naturally bent;

in the contraction state, the recovery connector (100) drives the anchoring arm (300) to slide relative to the sheath (400), and the anchoring hook (301) is contracted to the inside of the sheath (400).

6. The vena cava filter according to claim 1, wherein a plurality of the tube sheaths (400) are each inclined to the outside of the filter region (500) from the end connected to the recovery connector (100) to the end remote from the recovery connector (100).

7. Vena cava filter according to claim 6, characterized in that said tube sheaths (400) are resilient such that a plurality of said tube sheaths (400) are radially contracted with respect to said filter area (500) under an external force.

8. The vena cava filter according to claim 1, wherein a plurality of filter arms (700) are attached to the sheath cap (200), the plurality of filter arms (700) being spaced around the filter region (500);

the filter arms (700) are resilient so that the plurality of filter arms (700) tend to expand and the plurality of filter arms (700) collectively enclose the filter area (500).

9. The vena cava filter according to claim 8, characterized in that the end of the filter arm (700) distal to the sheath cap (200) is provided with a flat (701);

in a natural release state, a plurality of the straight portions (701) tend to be parallel to an insertion and extraction direction.