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CN214908645U - Vena cava protection device - Google Patents

Vena cava protection device Download PDF

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Publication number
CN214908645U
CN214908645U CN202121199434.0U CN202121199434U CN214908645U CN 214908645 U CN214908645 U CN 214908645U CN 202121199434 U CN202121199434 U CN 202121199434U CN 214908645 U CN214908645 U CN 214908645U
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China
Prior art keywords
section
filter
proximal
distal
vena cava
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CN202121199434.0U
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Chinese (zh)
Inventor
郑殿会
刘颖
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Beijing Huamai Taike Medical Instrument Co ltd
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Beijing Huamai Taike Medical Instrument Co ltd
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Priority to CN202121199434.0U priority Critical patent/CN214908645U/en
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Abstract

The utility model provides a vena cava protection device relates to the medical instrument field, including support portion and filter portion. The filter part comprises a recovery hook and a plurality of filter arms; each filtering arm comprises a near-end straight line section, a first bending section, a middle straight line section, a second bending section and a far-end straight line section which are connected in sequence; the support part comprises a near-end reducing section, a middle supporting section and a far-end reducing section which are connected in sequence. In the released state: the filter part is opened in the inside of support portion, and first crooked section card is in the corner position that the near end of middle part support section and the distal end of near-end reducing section are connected, and the second crooked section card is in the corner position that the distal end of middle part support section and the near end of far-end reducing section are connected. The utility model discloses alleviated among the prior art vena cava filter and released behind the blood vessel, took place easily that the implantation position bleeds, the filter time of implantation is short, the filter slope, the filter is difficult to safely take out, the filter causes more technical problem of damage to the blood vessel when taking out the back secondary and implanting.

Description

Vena cava protection device
Technical Field
The utility model belongs to the technical field of medical instrument and specifically relates to a vena cava protection device is related to.
Background
Clinically, before thrombus treatment, a vena cava protection device (also called a vena cava filter) is placed at the lower part of a renal artery to filter large venous thrombus through the vena cava filter, so as to prevent Pulmonary Embolism (PE), and after the treatment is finished, the filtered thrombus and the vena cava filter are recovered from a blood vessel.
At present, vena cava filters suffer from at least the following drawbacks:
1. the vena cava filter is easy to incline in the blood vessel, and once the filter is inclined, the filter is difficult to take out from the blood vessel;
2. in order to prevent the filter from shifting, barbs are arranged, and the barbs can seriously damage blood vessels;
3. the barbs of the vena cava filter pierce the vascular wall, the endothelium of the blood vessel grows, and the endothelial tissue gradually covers the vena cava filter after a period of time, so that the filter and the blood vessel grow together, the filter is difficult to withdraw from the blood vessel, and the blood vessel bleeds in a large area after the filter is recovered;
4. the barbs of the vena cava filter pierce the vascular wall, the larger the contact area between the filter and vascular tissues is, the longer the contact time is, the more difficult the filter is to recover from the blood vessel, but if the recovery time is too short, the short time of the filter in the blood vessel is, so that the treatment effect is not achieved;
5. after the filter is taken out, when the filter is implanted again, the filter is fixed into the vein cavity of the human body again through the fixing mode of the anchoring hook, and secondary or more injuries are caused to the blood vessel of the patient.
In summary, in the prior art, after the vena cava filter is released in a blood vessel, the problems of bleeding at an implantation part, short filter implantation time, inclination of the filter, difficulty in safely taking out the filter, more damage to the blood vessel when the filter is taken out and secondarily implanted, and the like easily occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a vena cava protection device to alleviate prior art, the vena cava filter releases behind the blood vessel, takes place easily that the implantation position is bled, the filter time of implantation is short, filter slope, filter are difficult to safely take out, the filter takes out the technical problem that causes more damages to the blood vessel when the secondary is implanted after the filter.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
the embodiment of the utility model provides a vena cava protection device, which comprises a bracket part and a filter part;
the filter section comprises a recovery hook and a plurality of filter arms; each filtering arm comprises a near-end straight line section, a first bending section, a middle straight line section, a second bending section and a far-end straight line section which are sequentially connected from a near end to a far end; the proximal ends of the proximal straight segments of the plurality of filter arms are uniformly connected to the radial circumferential surface of the distal end of the recovery hook, and in each filter arm, the first bending segment is bent towards the extending direction away from the recovery hook, and the second bending segment is bent towards the extending direction of the recovery hook; a developing coating is coated on each of the filter arms;
the bracket part comprises a near-end reducing section, a middle supporting section and a far-end reducing section which are sequentially connected from the near end to the far end; the bracket part is provided with a developing part;
in the released state: the near-end reducing section, the middle supporting section and the far-end reducing section are all unfolded to be cylindrical, and the diameter of the near-end reducing section and the diameter of the far-end reducing section are all smaller than that of the middle supporting section; the filter part is in the inside of support portion is opened and is umbelliform, and many the first crooked section of filtering the arm all block in the corner position that the near-end of middle part support section with the distal end of near-end reducing section is connected, many the second crooked section of filtering the arm all block in the corner position that the distal end of middle part support section with the near-end of far-end reducing section is connected.
In some optional implementations of this embodiment, the developing part includes: a first developing part arranged on the proximal reducing section; the second developing part is arranged on the middle supporting section; and the third developing part is arranged on the distal reducing section.
In some optional embodiments of this embodiment, the stent section further comprises a proximal support section and a distal support section, the distal end of the proximal support section being connected to the proximal end of the proximal reducing section, and the proximal end of the distal support section being connected to the distal end of the distal reducing section. In the released state: the near-end support section and the far-end support section are both unfolded to be cylindrical, and the diameter of the near-end reducing section and the diameter of the far-end reducing section are both smaller than the diameter of any one of the near-end support section, the middle support section and the far-end support section.
In these alternative embodiments, further optionally, the developing part comprises: a first developing part arranged on the proximal reducing section; the second developing part is arranged on the middle supporting section; a third developing part arranged on the distal reducing section; a fourth developing portion provided at the proximal end support section; and the fifth developing part is arranged on the far-end supporting section.
In any optional embodiment of the present embodiment, in which the developing part is disposed on the bracket part, further optionally, the first developing part is disposed at a corner portion where a proximal end of the middle support section is connected to a distal end of the proximal reducing section; and/or the third developing part is arranged at a corner part where the far end of the middle supporting section is connected with the near end of the far-end reducing section.
In this alternative embodiment, "and/or" means "and/or" preceding structure is provided concurrently with or in the alternative to "and/or" following structure.
In any of the above optional embodiments of this embodiment, further optionally, in the released state, the proximal end of the retrieval hook is located outside the holder portion.
In any optional implementation manner of this embodiment, further optionally, the stent part includes a bare metal stent and a covering membrane connected to the bare metal stent.
Further optionally, the bare metal stent comprises a plurality of stent rings, and the stent rings are arranged and connected to the covering membrane in a pairwise interval from the distal end of the covering membrane to the proximal end of the covering membrane.
Further optionally, the stent ring is formed by connecting a plurality of V-shaped stent units end to end.
In an optional embodiment of the present embodiment, the stent part includes a bare metal stent and a covering membrane, and further optionally, the bare metal stent is connected to an outer side of the covering membrane.
The embodiment of the utility model provides a can realize following beneficial effect:
an embodiment of the utility model provides a vena cava protection device, this vena cava protection device include support portion and filter portion. Specifically, the filter section includes a recovery hook and a plurality of filter arms; each filtering arm comprises a near-end straight line section, a first bending section, a middle straight line section, a second bending section and a far-end straight line section which are sequentially connected from the near end to the far end; the proximal ends of the proximal straight segments of the plurality of filter arms are uniformly connected to the radial circumferential surface of the distal end of the recovery hook, and in each filter arm, the first bending segment is bent towards the extending direction departing from the recovery hook, and the second bending segment is bent towards the extending direction of the recovery hook; and developing coatings are coated on the filtering arms. The bracket part comprises a near-end reducing section, a middle supporting section and a far-end reducing section which are sequentially connected from the near end to the far end; the bracket part is provided with a developing part.
In the released state: the near-end reducing section, the middle supporting section and the far-end reducing section are all unfolded to be cylindrical, and the diameter of the near-end reducing section and the diameter of the far-end reducing section are smaller than that of the middle supporting section; the filter portion is opened in the inside of stake body portion and is umbelliform, and the first crooked section of many filter arms all blocks the corner position that the near-end of middle part support section and the distal end of near-end reducing section are connected, and the second crooked section of many filter arms all blocks the corner position that the far-end of middle part support section and the near-end of far-end reducing section are connected.
The embodiment of the utility model provides an among the prior art, the vena cava filter releases behind the blood vessel, and the easy emergence is implanted the position and is bled, the filter time of implanting is short, the filter slope, the filter is difficult to safe take out, the filter takes out the problem that causes more damages to the blood vessel when the back secondary is implanted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of a support portion in a vena cava protection device according to an embodiment of the present invention;
fig. 2 is a schematic view of the overall structure of the filter portion of the vena cava protection device according to an embodiment of the present invention at a viewing angle;
fig. 3 is a schematic view of the overall structure of the filter portion of the vena cava protection device according to another view angle provided by the embodiment of the present invention;
fig. 4 is a schematic view of an overall structure of a filter portion of a vena cava protection device according to an embodiment of the present invention when viewed from a proximal end to a distal end;
fig. 5 is a partial cross-sectional view of the overall structure of the vena cava protection device according to an embodiment of the present invention.
Icon: 1-a scaffold part; 101-a proximal support section; 102-a proximal reducing section; 103-a middle support section; 104-a distal reducing section; 105-a distal support section; 11-bare metal stent; 12-coating a film; 2-a filter section; 21-recovery hook; 210-connecting column; 22-a filter arm; 221-proximal straight segment; 222-a first bend section; 223-middle straight line segment; 224-a second curved section; 225-distal straight line segment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In particular, in the present invention, the term "proximal" refers to the end closer to the heart of the human body during surgery, and "distal" refers to the end opposite the "proximal".
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The present embodiment provides a vena cava protection device, which, with reference to fig. 1-5, comprises a holder portion 1 and a filter portion 2.
Specifically, the filter section 2 includes a recovery hook 21 and a plurality of filter arms 22, and the specific number of the filter arms 22 is not limited, for example, but not limited to, 12 or 14. Each filter arm 22 includes a proximal straight segment 221, a first curved segment 222, a middle straight segment 223, a second curved segment 224, and a distal straight segment 225, which are connected in sequence from the proximal end to the distal end. The proximal ends of the proximal straight segments 221 of the plurality of filter arms 22 are uniformly connected to the radial circumferential surface of the distal end of the recovery hook 21, but the proximal ends of the proximal straight segments 221 of the plurality of filter arms 22 can be, but are not limited to, the distal end of the recovery hook 21 is connected to the connecting column 210, and the proximal ends of the proximal straight segments 221 of the plurality of filter arms 22 are uniformly connected to the radial circumferential surface of the connecting column 210; and in each filter arm 22, the first bent section 222 is bent toward the extending direction away from the recovery hook 21, and the second bent section 224 is bent toward the extending direction of the recovery hook 21; the plurality of filter arms 22 are each coated with a developer coating.
The stent portion 1 comprises a proximal reducing section 102, a middle supporting section 103 and a distal reducing section 104 which are sequentially connected from a proximal end to a distal end, and a developing portion is arranged on the stent portion 1 and comprises but is not limited to a developing ring.
In the released state: the proximal reducing section 102, the middle support section 103 and the distal reducing section 104 are all expanded to be cylindrical, and the diameter of the proximal reducing section 102 and the diameter of the distal reducing section 104 are smaller than the diameter of the middle support section 103; the filter part 2 is opened in the holder part 1 to form an umbrella shape, and the first bending sections 222 of the plurality of filter arms 22 are all clamped at the corner positions where the proximal ends of the middle support sections 103 are connected with the distal ends of the proximal reducing sections 102, and the second bending sections 224 of the plurality of filter arms 22 are all clamped at the corner positions where the distal ends of the middle support sections 103 are connected with the proximal ends of the distal reducing sections 104.
In this example, prior to thrombus treatment: the vein protection device is implanted at the position of the intravascular thrombus filter by using an implantation device, when the vein protection device is released, the stent part 1 is released, then under the development reference of a development coating and a development ring, the filter part 2 is released inside the expanded stent part 1 in a mode that 'the first bending sections 222 of a plurality of filter arms 22 are all clamped at the corner parts of the proximal end of the middle support section 103 connected with the distal end of the proximal reducing section 102, and the second bending sections 224 of a plurality of filter arms 22 are all clamped at the corner parts of the distal end of the middle support section 103 connected with the proximal end of the distal reducing section 104', and the filter part 2 is opened in an umbrella shape inside the stent part 1 so as to filter large vein thrombus by using a plurality of filter arms 22 and prevent pulmonary embolism; after the treatment is completed, the filter part 2 is recovered from the blood vessel, specifically, the proximal end of the recovery hook 21 is pulled in the proximal direction, so that the first bending sections 222 of the plurality of filter arms 22 are separated from the corner parts where the proximal end of the middle support section 103 is connected with the distal end of the proximal reducing section 102, the second bending sections 224 of the plurality of filter arms 22 are separated from the corner parts where the distal end of the middle support section 103 is connected with the proximal end of the distal reducing section 104, finally, the filter part 2 is pulled out of the stent part 1 from the proximal end of the stent part 1, the recovery hook 21 is continuously pulled in the proximal direction, and the filter part 2 can be integrally withdrawn out of the blood vessel, and the stent part 1 is permanently placed in the body.
Compared with the method for directly anchoring the filter arm to the blood vessel wall, the vein protection device provided by the embodiment has the following advantages that:
(1) after release, all the sections of the bracket part 1 are unfolded into a cylindrical shape, and at least a middle supporting section 103 in all the sections of the bracket part 1 is supported on the inner wall of the blood vessel, so that the bracket part has good supporting and displacement preventing effects and can prevent the filter from displacing;
(2) the implantation of the stent part 1 has no damage to the blood vessel, and after the vein protection device is completely released, the filter part 2 is not in direct contact with the blood vessel wall, so that the blood vessel can be prevented from being punctured or punctured after the filter is implanted, and the problem that the implanted part of the vena cava filter bleeds after being released in the blood vessel in the prior art is solved;
(3) after the vein protection device is completely released, the vein endothelial hyperplasia process is not contacted with the filter part 2, and the filter part 2 can still be pulled out from the bracket part 1 after being implanted for a long time, so that the taking-out time of the filter part 2 is prolonged, the recovery time is long enough, the filter part 2 can filter large thrombus in a human body for a long time, and the problem of short implantation time of the filter after the vena cava filter is released in the blood vessel in the prior art is solved;
(4) after the vein protection device is completely released, the blood vessel wall is not contacted with the filter part 2, so that the blood vessel is not pulled when the filter part 2 is withdrawn, the filter part 2 is easy to withdraw, and the process of withdrawing the filter part 2 has no damage to the blood vessel;
(5) after the vein protection device is completely released, the contact area between the filter part 2 and the bracket part 1 is larger, the filter arms 22 of the filter part 2 are supported on the bracket part 1, particularly the middle straight line segments 223 of a plurality of filter arms 22, the inner peripheral surface of the holder portion 1 is supported with a wide range and stability, and at the same time, the first bending sections 222 of the plurality of filter arms 22 are all clamped at the corner portion where the proximal end of the middle support section 103 is connected with the distal end of the proximal reducing section 102, and the second bending sections 224 of the plurality of filter arms 22 are all clamped at the corner portion where the distal end of the middle support section 103 is connected with the proximal end of the distal reducing section 104, so that the filter portion 2 is prevented from inclining or shifting relative to the holder portion 1, furthermore, the filter part 2 can be kept in a filtering posture at any time, the near end of the recovery hook 21 can be caught, the filter part 2 can be retracted, and the blood vessel can not be damaged in the process of retracting the filter part 2;
(6) in this embodiment, the filter part 2 is released inside the expanded stent part 1 in a manner that "the first bending sections 222 of the plurality of filter arms 22 are all clamped at the corner parts where the proximal ends of the middle support sections 103 are connected with the distal end of the proximal reducing section 102, and the second bending sections 224 of the plurality of filter arms 22 are all clamped at the corner parts where the distal ends of the middle support sections 103 are connected with the proximal ends of the distal reducing sections 104", and the process of withdrawing the filter part 2 has no damage to the stent part 1, so that the stent part 1 can be recycled, that is, when the vein protection device is implanted into a blood vessel of a human body for filtering thrombus, the stent part 1 which is implanted into the blood vessel before being used can be reused without implanting a new stent part 1 again, thereby avoiding the damage to the blood vessel caused by implanting a new stent part 1, and being safe and convenient.
In conclusion, the embodiment solves the problems that after the vena cava filter is released in the blood vessel, the bleeding of the implanted part is easy to occur, the implantation time of the filter is short, the filter is inclined, the filter is difficult to safely take out, and more damages are caused to the blood vessel when the filter is taken out and implanted for the second time in the prior art.
To further facilitate accurate implantation of the filter part 2 inside the holder part 1, in an alternative embodiment of the present embodiment, the developing part on the holder part 1 comprises a first developing part, a second developing part and a third developing part, wherein the first developing part is disposed at the proximal end reducing section 102; the second developing portion is provided in the middle support section 103; the third development portion is disposed at the distal end reduced diameter section 104. Through first development portion, second development portion, third development portion and fourth development portion to confirm the concrete position of 1 each section structure of support portion fast, accurately, and then guarantee that filter portion 2 is fixed in inside 1 of support portion steadily.
With continued reference to fig. 1 and 5, in an alternative embodiment of this embodiment, the stent section 1 further preferably comprises a proximal support section 101 and a distal support section 105, wherein the distal end of the proximal support section 101 is connected to the proximal end of the proximal reducing section 102, and the proximal end of the distal support section 105 is connected to the distal end of the distal reducing section 104. In the released state: the proximal support section 101 and the distal support section 105 are both cylindrical, and the diameter of the proximal reducing section 102 and the diameter of the distal reducing section 104 are both smaller than the diameter of any of the proximal support section 101, the middle support section 103, and the distal support section 105. In the preferred embodiment, the far-end supporting section 105 and the near-end supporting section 101 are arranged, so that the adherence of the stent part 1 in the blood vessel can be further enhanced, the supporting capability of the stent part 1 is further enhanced, and the vein protection device is prevented from moving in the blood vessel along with the flushing of blood or the prolonging of thrombus filtering time.
In the preferred embodiment, the developing unit provided in the holder unit 1 may further include: the developing device comprises a first developing part, a second developing part, a third developing part, a fourth developing part and a fifth developing part, wherein the fourth developing part is arranged on the near-end supporting section 101; the fifth developing part is disposed on the distal supporting section 105 to enhance the developing effect of the bracket part 1.
In order to further improve the accuracy of the implantation position of the filter part 2, in any of the above-mentioned alternative embodiments of the present embodiment, preferably, the first visualization part is disposed at the corner portion where the proximal end of the middle support section 103 is connected with the distal end of the proximal reduced-diameter section 102; and/or the third developing part is arranged at the corner part where the distal end of the middle supporting section 103 is connected with the proximal end of the distal reducing section 104. In this alternative embodiment, "and/or" means "and/or" the preceding structure is provided at the same time or alternatively to "and/or" the following structure, and the developing part is preferably, but not limited to, a developing ring.
In an alternative embodiment of this embodiment, it is preferable that the proximal end of the recovery hook 21 is located outside the holder portion 1 in the released state, and specifically, the proximal straight section 221 and the first bending section 222 of each filter arm 22 should have as long as possible, so as to ensure that the proximal end of the recovery hook 21 does not touch the holder portion 1 when the filter portion 2 is recovered, so as to avoid damaging the holder portion 1, as long as the proximal end of the recovery hook 21 is located outside the holder portion 1 in the released state.
In an alternative embodiment of the present embodiment, the stent section 1 includes a bare metal stent 11 and a covering membrane 12 attached to the bare metal stent 11. The coating 12 may be a fabric coating, a polymer coating, or the like, but is preferably, but not limited to, a polymer coating having better adaptability to the human body so as to reduce or avoid immunological rejection of the human body to the coating 12.
More preferably, as shown in fig. 1 and 5, the bare metal stent 11 includes a plurality of stent rings connected to the covering membrane 12 in a spaced-apart arrangement from the distal end of the covering membrane 12 to the proximal end of the covering membrane 12. The arrangement of the plurality of stent rings increases the adherence of the covering film 12, can avoid large thrombus from leaking between the covering film 12 and the vessel wall, and improves the effectiveness of thrombus filtration. In order to increase the supporting force of the support ring, the support ring is preferably formed by connecting a plurality of V-shaped support units end to end.
In this embodiment, the covering film 12 may be connected to the inner side of the bare metal stent 11 or connected to the outer side of the bare metal stent 11, and preferably, the bare metal stent 11 is connected to the outer side of the covering film 12 to increase the displacement resistance of the vein protection device, and meanwhile, the compliance of the bare metal stent 11 is improved, and the specific connection manner of the bare metal stent 11 and the covering film 12 includes, but is not limited to, the bare metal stent 11 being sewn to the covering film 12.
Finally, it should be noted that: the embodiments in the present description are all described in a progressive manner, each embodiment focuses on the differences from the other embodiments, and the same and similar parts among the embodiments can be referred to each other; the above embodiments in the present specification are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A vena cava protection device, comprising a stent section (1) and a filter section (2);
the filter section (2) comprises a recovery hook (21) and a plurality of filter arms (22); each filtering arm (22) comprises a proximal straight line section (221), a first bending section (222), a middle straight line section (223), a second bending section (224) and a distal straight line section (225) which are sequentially connected from the proximal end to the distal end; the proximal ends of the proximal straight sections (221) of the filter arms (22) are uniformly connected with the radial circumferential surface of the distal end of the recovery hook (21), and in each filter arm (22), the first bending section (222) is bent towards the extending direction away from the recovery hook (21), and the second bending section (224) is bent towards the extending direction of the recovery hook (21); a plurality of filter arms (22) are coated with developing coatings;
the stent part (1) comprises a near-end reducing section (102), a middle supporting section (103) and a far-end reducing section (104) which are sequentially connected from a near end to a far end; the bracket part (1) is provided with a developing part;
in the released state: the proximal reducing section (102), the middle supporting section (103) and the distal reducing section (104) are all expanded to be cylindrical, and the diameter of the proximal reducing section (102) and the diameter of the distal reducing section (104) are both smaller than the diameter of the middle supporting section (103); the filter part (2) is opened in the bracket part (1) to form an umbrella shape, the first bending sections (222) of the filter arms (22) are clamped at corner parts where the near ends of the middle support section (103) and the far ends of the near-end reducing sections (102) are connected, and the second bending sections (224) of the filter arms (22) are clamped at corner parts where the far ends of the middle support section (103) and the near ends of the far-end reducing sections (104) are connected.
2. The vena cava protection device according to claim 1, wherein the visualization portion comprises:
a first developing portion provided to the proximal end reducing section (102);
a second developing portion provided to the middle support section (103);
a third developing portion provided to the distal end reducing section (104).
3. A vena cava protection device according to claim 1,
the stent section (1) further comprises a proximal support section (101) and a distal support section (105), the distal end of the proximal support section (101) being connected to the proximal end of the proximal reducer section (102), the proximal end of the distal support section (105) being connected to the distal end of the distal reducer section (104);
in the released state: the proximal support section (101) and the distal support section (105) are both expanded to be cylindrical, and the diameter of the proximal reducing section (102) and the diameter of the distal reducing section (104) are both smaller than the diameter of any one of the proximal support section (101), the middle support section (103) and the distal support section (105).
4. The vena cava protection device according to claim 3, wherein the visualization portion comprises:
a first developing portion provided to the proximal end reducing section (102);
a second developing portion provided to the middle support section (103);
a third developing portion provided to the distal end reducing section (104);
a fourth development portion provided to the proximal end support section (101);
a fifth development portion provided to the distal end support section (105).
5. A vena cava protection device according to claim 2 or 4, characterized in that the first visualization portion is provided at a corner region where the proximal end of the central support section (103) connects with the distal end of the proximal reduced diameter section (102); and/or the third developing part is arranged at a corner part where the far end of the middle supporting section (103) is connected with the near end of the far end reducing section (104).
6. A vena cava protection device according to any of claims 1-4, characterized in that in a released state, the proximal end of the retrieval hook (21) is located outside the stent portion (1).
7. Vena cava protection device according to any of claims 1-4, characterized in that the stent section (1) comprises a bare metal stent (11) and a cover membrane (12) connected to the bare metal stent (11).
8. The vena cava protection device according to claim 7, wherein the bare metal stent (11) comprises a plurality of stent loops connected to the cover (12) in a spaced-apart arrangement from a distal end of the cover (12) to a proximal end of the cover (12).
9. A vena cava protection device according to claim 8 wherein the stent rings are formed from a plurality of V-shaped stent units connected end-to-end.
10. Vena cava protection device according to claim 7, characterized in that the bare metal stent (11) is attached to the outside of the cover membrane (12).
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113208771A (en) * 2021-05-31 2021-08-06 北京华脉泰科医疗器械股份有限公司 Vena cava protection device
CN115300178A (en) * 2022-06-28 2022-11-08 杭州创心医学科技有限公司 A branched stent-graft

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113208771A (en) * 2021-05-31 2021-08-06 北京华脉泰科医疗器械股份有限公司 Vena cava protection device
CN113208771B (en) * 2021-05-31 2024-10-29 北京华脉泰科医疗器械股份有限公司 Vena cava protection device
CN115300178A (en) * 2022-06-28 2022-11-08 杭州创心医学科技有限公司 A branched stent-graft

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