CN115607331B

CN115607331B - Adjustable anchoring type vena cava filter

Info

Publication number: CN115607331B
Application number: CN202211616879.3A
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: 2023-03-31
Anticipated expiration: 2042-12-16
Also published as: CN115607331A

Abstract

The invention provides an adjustable anchoring type vena cava filter, which relates to the technical field of thrombus medical equipment and comprises the following components in parts by weight: the device comprises a recovery connecting piece, a cavity shell, a moving piece, a plurality of anchoring arms and a plurality of sleeves; the recycling connecting piece is rotatably connected to the cavity shell and is in spiral fit with the moving piece; the plurality of sleeves are arranged at intervals along the circumferential direction of the rotation of the recovery connecting piece and are respectively connected with the cavity shell; the plurality of anchoring arms penetrate through the plurality of sleeves in a one-to-one correspondence manner, and are all connected to the movable piece; the adjustable anchoring type vena cava filter provided by the invention has an anchoring state and a contraction state, can realize the adjustment of the extension length of the hook claw part of the anchoring arm, can realize the adjustment of the depth of the hook claw part penetrating into the vascular wall in the anchoring process, is suitable for patients with different vascular wall thicknesses, and improves the medical safety.

Description

Adjustable anchoring type vena cava filter

Technical Field

The invention relates to the technical field of thrombus medical equipment, in particular to an adjustable anchoring type vena cava filter.

Background

The vena cava filter can intercept thrombus after being implanted, thereby avoiding the thrombus moving along with blood flow to generate embolism diseases. To ensure a stable position of the vena cava filter after implantation, it is often necessary to anchor it to the inner wall of the blood vessel. However, due to the differences of the thicknesses of the blood vessel walls of patients of different races and different ages, the same anchoring strength and the same depth of penetration into the blood vessel wall can cause the damage or perforation of the blood vessel of the patient with a thinner blood vessel wall; if the penetration depth at the anchoring is uniformly reduced, there is a risk of the filter slipping, shifting or tilting.

Disclosure of Invention

The invention aims to provide an adjustable anchoring type vena cava filter, which solves the technical problem that the vena cava filter in the prior art cannot adjust and control the extending length of an anchoring arm.

In a first aspect, the present invention provides an adjustable anchored vena cava filter comprising: the recovery connecting piece, the cavity shell, the moving piece, the plurality of anchoring arms and the plurality of sleeves are arranged on the cavity shell;

the recovery connecting piece is rotatably connected to the cavity shell and is in spiral fit with the moving piece;

the plurality of sleeves are arranged at intervals along the circumferential direction of the rotation of the recovery connecting piece and are respectively connected with the cavity shell;

the plurality of anchoring arms penetrate through the plurality of sleeves in a one-to-one correspondence mode, and are all connected to the movable piece;

in an anchoring state, the recovery connecting piece drives the movable piece, and the movable piece pushes the anchoring arms so that hook parts of the anchoring arms all extend to the outside of the sleeve;

in a contracted state, the recovery connecting member drives the movable member, and the movable member pulls the plurality of anchoring arms so that the plurality of claw portions are all contracted into the sleeve.

In combination with the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein the sleeve is inclined in a direction away from the recovery connection member rotation axis from an end connected to the chamber housing to an end away from the chamber housing.

In combination with the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the anchoring arm is provided with elasticity so that the hooking jaw part has a tendency to bend in a direction away from the rotational axis of the retrieval connection member.

With reference to the first aspect, the present disclosure provides a third possible implementation manner of the first aspect, wherein the recycling connection includes: the hook part is positioned outside the cavity shell and connected with the screw rod part;

the screw rod part is inserted into the cavity shell and axially limited relative to the cavity shell, and the screw rod part is matched with the movable part.

With reference to the third possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the recycling connecting piece is provided with a limiting boss;

and in the anchoring state, the limiting boss abuts against the outer end face of the cavity shell.

With reference to the third possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein a spring is installed between the cavity shell and the movable member;

the elastic force of the spring acts on the movable piece and has a tendency to fix the recovery connection piece relative to the cavity shell along the axial direction of the screw portion and to cause the anchoring arm to tend to the anchoring state.

With reference to the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the movable member is provided with a plurality of protruding portions, and the plurality of anchor arms are connected to the plurality of protruding portions in a one-to-one correspondence;

the sleeve pipes are provided with sliding grooves, and the protruding portions are in one-to-one corresponding sliding connection with the sliding grooves.

With reference to the first aspect, the present invention provides a seventh possible embodiment of the first aspect, wherein a filter member is connected to the chamber housing or the movable member;

in a natural release condition, the filter element expands radially along the axis of rotation of the recovery connection element.

With reference to the seventh possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the filter element includes a plurality of filter arms, the filter arms are arranged at intervals along a circumferential direction of rotation of the recycling connecting member, and the filter arms are respectively connected to the cavity shell or the movable member.

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, which is far away from the chamber shell, is provided with an axial extension, which is parallel to the rotation axis of the recovery connection.

The embodiment of the invention brings the following beneficial effects: the recovery connecting piece is rotatably connected to the cavity shell and is in threaded fit with the moving piece, the multiple sleeves are arranged at intervals along the circumferential direction of the rotation of the recovery connecting piece and are respectively connected to the cavity shell, the multiple anchoring arms penetrate through the multiple sleeves in a one-to-one correspondence manner and are all connected to the moving piece, the moving piece is driven by the recovery connecting piece in an anchoring state, and the moving piece pushes the multiple anchoring arms so that the claw parts of the anchoring arms all extend to the outer parts of the sleeves; the movable member is driven by the recovery connecting member in the contraction state, and the movable member pulls the plurality of anchoring arms so that the plurality of claw portions are all contracted into the sleeve. Can realize the regulation to the hook portion extension length of anchoring arm, can realize the regulation that the hook portion pierces the vascular wall degree of depth at anchoring in-process, be applicable to the patient of different vascular wall thickness, improve medical safety nature.

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 schematic view of an adjustable anchored vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an adjustable anchored vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of position A of FIG. 2;

FIG. 4 is a schematic view of a retrieval connection for an adjustable anchored vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of an anchoring arm and cannula of an adjustable anchored vena cava filter provided in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of a moveable member of an adjustably anchored vena cava filter provided in accordance with an embodiment of the present invention.

An icon: 100-recovery of the connection; 110-hook portion; 120-a lead screw portion; 130-a limit boss; 200-a chamber shell; 300-moving parts; 301-a boss; 400-anchoring arms; 401-a claw portion; 500-a cannula; 501-a chute; 600-a spring; 700-a filter element; 710-a filter arm; 711-axial extension.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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 and may be, for example, 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2 and 3, an embodiment of the present invention provides an adjustable anchored vena cava filter, comprising: the retrieval connection member 100, the chamber housing 200, the movable member 300, the plurality of anchor arms 400, and the plurality of bushings 500; the recycling connecting member 100 is rotatably connected to the cavity housing 200, and the recycling connecting member 100 is spirally coupled to the moving member 300; the plurality of bushings 500 are arranged at intervals along the circumferential direction of the rotation of the recovery connection member 100, and the plurality of bushings 500 are respectively connected to the cavity housing 200; the plurality of anchor arms 400 pass through the plurality of sleeves 500 in a one-to-one correspondence, and the plurality of anchor arms 400 are all connected to the movable member 300.

In the anchoring state, the movable member 300 is driven by the recycling connection member 100, and the movable member 300 pushes the plurality of anchoring arms 400, so that the claw portions 401 of the plurality of anchoring arms 400 all extend to the outside of the sleeve 500.

In the contracted state, the recovery link 100 drives the movable member 300, and the movable member 300 pulls the plurality of anchor arms 400 so that the plurality of claw portions 401 are all contracted into the sleeve 500.

Adjustable anchor formula vena cava filter is after implanting, and accessible rotation recovery connecting piece 100 and then drive moving part 300 removes for chamber shell 200 and sleeve pipe 500, drives anchor arm 400 through moving part 300 and stretches out and draws back for sleeve pipe 500, and then can realize the reciprocal switching of anchor state and shrink state, has realized stretching out the regulation of sleeve pipe 500 length to hook claw portion 401 at this in-process, can make vena cava filter be applicable to the patient of vascular wall thickness difference. In addition, when the vena cava filter needs to be taken out, the movable piece 300 can be driven by the rotary recycling connecting piece 100, and then the anchoring arm 400 can be driven, so that the hook part 401 can be completely contracted into the sleeve 500, and the damage to the blood vessel wall caused by the hook part 401 in the vena cava filter recycling process can be avoided. Since the claw portion 401 can be contracted, there is no fear that the claw portion 401 grows together with the blood vessel wall, whereby the filter implantation use time period is not limited any more, the medical effective time period of the filter is prolonged, and it is convenient to take out the filter at any time.

It should be noted that, in an alternative embodiment, a filtering region may be formed by surrounding a plurality of sleeves 500, and thrombus may be blocked inside the filtering region by the plurality of sleeves 500, so that the filtering member 700 described below may be omitted.

In the embodiment of the present invention, the sleeve 500 is inclined in a direction away from the rotational axis of the recovery connection member 100 from the end connected to the chamber housing 200 to the end away from the chamber housing 200. As the cannula 500 is guided, the claw portions 401 extending from the end of the cannula 500 away from the retrieval connection member 100 approach the inner wall of the blood vessel, and as the extension of the claw portions 401 increases, the anchoring strength thereof to the blood vessel wall or the depth of penetration thereof into the blood vessel wall increases.

For ease of implantation, the sleeve 500 may be made of an elastomeric material, and during implantation of the filter using a custom made delivery device, the filter may be positioned within the delivery device, and the plurality of sleeves 500 may be caused to contract toward one another and tend to bunch together under the squeezing action of the delivery device, thereby reducing the radial dimension of the vena cava filter.

Further, the anchor arm 400 is provided with elasticity such that the hook portion 401 tends to be bent in a direction away from the rotation axis of the recovery link 100.

In the contracted state, the finger portion 401 is pulled into the sleeve 500, and the finger portion 401 deforms in accordance with the extending direction of the sleeve 500, so that the curved finger portion 401 can completely enter the sleeve 500, thereby preventing the finger portion 401 from leaking outside from piercing or scratching the blood vessel. Under the anchoring state, retrieve connecting piece 100 and pass through bolt structure drive moving part 300, and then promote anchor arm 400 and slide for sleeve pipe 500 to it is overhanging to realize hook portion 401, and overhanging hook portion 401 kick-backs naturally and forms the bending that approaches to the vascular wall, still can set up pointed portion at hook portion 401's head end, and then it pierces the vascular wall of being convenient for, forms stable location with this, avoids the vena cava filter to produce slippage or slope.

As shown in fig. 2, 3 and 4, the recovery connection member 100 includes: a hook 110 and a screw 120, the hook 110 being located outside the chamber housing 200, and the hook 110 being connected to the screw 120; the screw part 120 is inserted into the chamber housing 200, and is axially limited with respect to the chamber housing 200, and the screw part 120 is fitted to the movable member 300.

Specifically, the hooking portion 110 may be configured as a hook or a snap ring, and the like, for cooperating with the withdrawing device to pull and recover the vena cava filter, and the screw portion 120 may be driven to rotate by the hooking portion 110. Preferably, the pitch of the screw portion 120 is set to a known and determined value, and the axial displacement of the movable member 300 relative to the screw portion 120 can be calculated by calculating the number of rotations of the hook portion 110, which can be used as a basis for adjusting the depth of the hook portion 401 penetrating into the vein.

Further, the recovery connecting member 100 is provided with a limit boss 130; in the anchoring state, the stopper boss 130 abuts on the outer end surface of the cavity case 200, and under the condition that the stopper boss 130 abuts on the outer end surface of the cavity case 200, the length of the screw portion 120 is limited, so that the limit size of the hook portion 401 extending outward can be defined. Therefore, a limiting device such as a snap ring can be additionally arranged at the end part of the screw part 120, so that the movable piece 300 and the screw part 120 are prevented from loosening.

Further, a spring 600 is installed between the chamber housing 200 and the movable member 300; the elastic force of the spring 600 acts on the movable member 300 and has a tendency to fix the recovery link member 100 with respect to the chamber case 200 in the axial direction of the screw part 120 and to urge the anchor arm 400 toward the anchor state.

The spring 600 may be sleeved on the lead screw portion 120, so as to prevent the spring 600 from deflecting. Under the combined action of the spring 600 and the limit boss 130, it can be ensured that the recovery connection member 100 tends to be fixed axially relative to the chamber shell 200, and the recovery connection member 100 can rotate freely.

In an alternative embodiment, the anchoring arm 400 may push the movable member 300 in the reverse direction in the anchoring state, and cause the movable member 300 to force the spring 600 to be elastically deformed, thereby preventing the hook portion 401 from being excessively extended.

The spring 600 is elastically deformed at all times after the assembly, so that the spring 600 has a sufficiently large elastic force, and the recovery link 100 is fixed to the chamber case 200 in the axial direction of the screw portion 120, thereby ensuring that the rotation of the screw portion 120 directly corresponds to the extension dimension of the adjustment claw portion 401. In the process of pulling the hook portion 110 to take out the vena cava filter, the screw portion 120 drives the movable member 300 to further compress the spring 600, and further drives the anchoring arm 400 to further contract, thereby preventing the hook portion 401 from leaking and scratching the blood vessel. In addition, under the elastic force of the spring 600, the relative stability of the recovery connection member 100, the cavity case 200, the movable member 300, the anchor arm 400, and the sleeve 500 in the anchored state is maintained, and the variation in the penetration depth of the claw portion 401 due to the relative displacement between the devices is avoided.

Further, the movable member 300 may be slidably connected to the cavity housing 200 or the sleeve 500, and by additionally providing a sliding way, the movable member 300 may be ensured to slide smoothly, and the movable member 300 may be prevented from rotating around the screw portion 120.

As shown in fig. 2, 3, 5 and 6, the movable member 300 is provided with a plurality of protrusions 301, and the plurality of anchor arms 400 are connected to the plurality of protrusions 301 in a one-to-one correspondence; the plurality of sleeves 500 are all provided with sliding grooves 501, and the plurality of protrusions 301 are slidably connected to the plurality of sliding grooves 501 in a one-to-one correspondence manner.

Through the protruding portion 301 along the sliding groove 501, under the condition that the sleeve 500 is connected to the cavity shell 200, the positioning of the movable member 300 relative to the cavity shell 200 in the rotation direction of the recovery connecting member 100 is realized, the structural compactness is improved, a limit structure for the movable member 300 is not required to be additionally arranged, the moving stroke of the movable member 300 can be limited through the length of the sliding groove 501, the equipment manufacturing is facilitated, and the production cost is reduced.

Further, the chamber housing 200 or the movable member 300 is connected with a filter member 700; in the natural release state, the filter member 700 expands in the radial direction of the rotation axis of the recovery link member 100.

Through addding and filtering piece 700 and be used for filtering the thrombus, need not through a plurality of sleeve pipes 500 interception thrombus from this, and then reducible sleeve pipe 500's quantity, the corresponding quantity that has reduced anchor arm 400 to can reduce hook claw portion 401 and to blood vessel puncture point quantity, reduce the damage that the blood vessel received.

As shown in fig. 1 and 2, in the present embodiment, the filter member 700 includes a plurality of filter arms 710, the plurality of filter arms 710 are spaced apart from each other along a circumferential direction of rotation of the recycling connecting member 100, and the plurality of filter arms 710 are respectively connected to the cavity housing 200 or the movable member 300, so that the plurality of filter arms 710 form an umbrella structure, and thrombus can be trapped inside a filter area defined by the plurality of filter arms 710.

Furthermore, the filter arms 710 can be made of elastic materials, and under the extrusion action of the conveying device, the filter arms 710 can be deformed and gathered together, so that the radial size of the filter is reduced.

Further, the end of the filter arm 710 remote from the chamber housing 200 is provided with an axial extension 711, the axial extension 711 being parallel to the rotation axis of the recovery connection 100. After implantation, the axial extension 711 approaches to be parallel to and attached to the vessel wall, thereby preventing the filter from tilting in the vessel.

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 these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An adjustable anchored vena cava filter, comprising: a retrieval connection member (100), a chamber housing (200), a moveable member (300), a plurality of anchoring arms (400), and a plurality of bushings (500);

the recovery connecting piece (100) is rotatably connected to the cavity shell (200), and the recovery connecting piece (100) is spirally matched with the movable piece (300);

the plurality of sleeves (500) are arranged at intervals along the circumferential direction of the rotation of the recovery connecting piece (100), and the plurality of sleeves (500) are respectively connected to the cavity shell (200);

the anchoring arms (400) penetrate through the sleeves (500) in a one-to-one correspondence mode, and the anchoring arms (400) are connected to the movable piece (300);

a spring (600) is arranged between the cavity shell (200) and the movable piece (300); the elastic force of the spring (600) acting on the mobile element (300) and having a tendency to axially fix the recovery connection (100) with respect to the housing (200) and to bring the anchoring arm (400) towards the anchoring condition;

in the anchoring state, the movable member (300) is driven by the recovery connecting member (100), and the movable member (300) pushes the plurality of anchoring arms (400) so that the claw parts (401) of the plurality of anchoring arms (400) all extend to the outside of the sleeve (500);

in the contracted state, the movable member (300) is driven by the recovery connection member (100), and the movable member (300) pulls the plurality of anchor arms (400) so that the plurality of claw portions (401) are all contracted into the sleeve (500).

2. The adjustably anchored vena cava filter according to claim 1, wherein the cannula (500) is angled away from the rotational axis of the retrieval connector (100) from the end connecting the lumen housing (200) to the end distal from the lumen housing (200).

3. An adjustable anchored vena cava filter according to claim 1 wherein the anchoring arms (400) are resilient such that the catch portions (401) have a tendency to bend away from the axis of rotation of the retrieval connector (100).

4. The adjustable anchored vena cava filter according to claim 1, wherein the retrieval connector (100) comprises: the cavity shell comprises a hooking part (110) and a screw rod part (120), wherein the hooking part (110) is positioned outside the cavity shell (200), and the hooking part (110) is connected with the screw rod part (120);

the screw rod part (120) is inserted into the cavity shell (200) and axially limited relative to the cavity shell (200), and the screw rod part (120) is matched with the movable piece (300).

5. The adjustably anchored vena cava filter according to claim 4, wherein the retrieval connector (100) is provided with a stop boss (130);

in the anchoring state, the limiting boss (130) abuts against the outer end face of the cavity shell (200).

6. The adjustable anchored vena cava filter according to claim 1, wherein the moveable member (300) is provided with a plurality of bosses (301), and a plurality of the anchoring arms (400) are connected to a plurality of the bosses (301) in a one-to-one correspondence;

the sleeves (500) are provided with sliding grooves (501), and the protrusions (301) are slidably connected to the sliding grooves (501) in a one-to-one correspondence manner.

7. The adjustably anchored vena cava filter according to claim 1, wherein a filter (700) is attached to the housing (200) or the moveable member (300);

in the natural release state, the filter element (700) expands radially along the axis of rotation of the recovery connection element (100).

8. The adjustably anchored vena cava filter according to claim 7, wherein the filter element (700) comprises a plurality of filter arms (710), wherein the plurality of filter arms (710) are spaced apart along a circumferential direction of rotation of the recovery connector (100), and wherein the plurality of filter arms (710) are coupled to the housing (200) or the movable member (300), respectively.

9. Adjustable anchored vena cava filter according to claim 8, characterized in that the end of the filter arm (710) distal to the lumen housing (200) is provided with an axial extension (711), said axial extension (711) being parallel to the axis of rotation of the recovery connection (100).