CN212213935U

CN212213935U - Recoverable vein thrombus filter of M shape

Info

Publication number: CN212213935U
Application number: CN202020488588.0U
Authority: CN
Inventors: 高延彬; 何辉; 张希全; 孙林龙
Original assignee: Shanghai Sandy Medical Technology Co ltd
Current assignee: Shanghai Sandy Medical Technology Co ltd
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2020-12-25
Anticipated expiration: 2030-04-07

Abstract

The utility model discloses a recoverable vein thrombus filter of M shape belongs to vein thrombus filter technical field. It is composed of a conical filter screen, a recovery pipe and a supporting pin; the conical filter screen is a hollow conical memory metal wire filter screen; the tail ends of the memory metal wires around the opening of the conical filter screen are reversely bent, a supporting pin is arranged after each memory metal wire is bent, the supporting pins and the concave conical filter screen jointly form a folding structure with an M-shaped section, at least one layer of outward positioning barbs are arranged on the supporting pins, and each layer of positioning barbs is formed by uniformly distributing a plurality of hook bodies in each direction; a recovery pipe is fixed in the center of the concave part of the conical filter screen, and a recovery hook groove is formed in the recovery pipe. The near end of the filter adopts an M-shaped folding structure, and compared with a V-shaped folding structure, the length of the filter after being folded is shorter, so that the total length of the filter is favorably shortened, and the application range of the filter is wider; the filter is well jointed with the blood vessel, is stable in support and is easy to take out after long-term implantation.

Description

Recoverable vein thrombus filter of M shape

Technical Field

The utility model relates to a recoverable vein thrombus filter of M shape belongs to vein thrombus filter technical field.

Background

At present, the incidence of Deep Vein Thrombosis (DVT) formation is increased day by day, and once the vein thrombosis falls off, the vein thrombosis can enter and block the pulmonary artery along with the blood flow, so that the clinical manifestation of pulmonary artery thrombosis Plug (PE) is caused. The incidence of Deep Vein Thrombosis (DVT) is about 1/1000 per year in the united states. Approximately 1/3 untreated symptomatic patients were combined into pulmonary artery thromboembolism (PE).

The most effective physical therapy for the prevention of pulmonary thromboembolism (PE) is the placement of a thrombus filter in the vein. The thrombus filter is divided into two types: permanent filters and recyclable filters. The permanent filter can provide a lifelong filtering function, has the maximum lumen vein intimal fixation force, and has research verification that the incidence of PE can be effectively reduced after the filter is implanted, but the popularization is limited because the long-term implantation in vivo can cause complications such as inferior vena cava perforation, filter displacement and secondary thrombus, inferior vena cava occlusion, DVT recurrence and the like; the recyclable filter has an advantage that it can be placed in the body as a permanent filter for a long period of time and can also be taken out as a semipermanent filter, but has a disadvantage that the filter is placed in the body as a semipermanent filter for a short period of time, generally only 2 weeks, and after exceeding the taking-out time window, the filter is adhered to the blood vessel wall to be integrated due to the problem of endothelialization caused by the barbs, and thus is not easily taken out. Clinical data at home and abroad show that less than 30% of the recoverable filters which can be successfully taken out remain in the body, so that the advantages of the selectable filters are not obvious. The reason for the low extraction rate is that the current filter has a short extraction window period, and the extraction requires more complicated operation techniques and additional equipment, which increases the treatment cost; in addition, because the length of the folded filter is too long at present, the filter cannot enter some diseases, and therefore, the applicable disease range needs to be further improved.

Disclosure of Invention

The utility model discloses the technical problem that will solve lies in: provides an M-shaped recyclable venous thrombus filter, which solves the problems that the existing venous thrombus filter is inconvenient to take out and overlong in length.

The utility model discloses the technical problem that will solve takes following technical scheme to realize:

an M-shaped recoverable venous thrombus filter, which consists of a conical filter screen, a recovery pipe and a support stitch;

the conical filter screen is a hollow conical-structure memory metal wire filter screen formed by cutting or weaving memory metal by laser;

the tail ends of the memory metal wires around the opening of the conical filter screen are reversely bent, each memory metal wire is provided with a supporting pin after being bent, the supporting pins are parallel to the central axis of the conical filter screen, the supporting pins and the inwards-concave conical filter screen jointly form a folding structure with an M-shaped section, at least one layer of outward positioning barbs are arranged on the supporting pins, and each layer of positioning barbs is formed by uniformly distributing a plurality of hook bodies in each direction;

a recovery pipe is fixed in the center of the concave part of the conical filter screen, and a recovery hook groove is formed in the recovery pipe.

As a preferred example, the conical filter screen is made of a nickel-titanium alloy material.

As a preferred example, the support pins are made of 316L stainless steel material or nitinol material.

As a preferred example, the end of the supporting pin is provided with a layer of positioning barbs, and the hook bodies of the positioning barbs are formed by bending the end of the supporting pin outwards.

As a preferable example, the connection part of the supporting pin and the conical filter screen is provided with a layer of positioning barbs, and the hooks of the positioning barbs are welded on the outer sides of the supporting pins.

The utility model has the advantages that:

(1) the filter adopts an open-loop design with an opening at one end, a plurality of supporting pins are uniformly distributed along the circumferential direction, the supporting pins play a supporting role in the circumferential direction to prevent the blood vessel from deforming, and the open-loop design (the open structure is adopted at the far end) ensures that the filter can not be completely wrapped by the endothelial growth after the filter is placed for a long time, thereby prolonging the window period for taking out the filter;

(2) the near end of the filter adopts an M-shaped folding structure, and compared with a V-shaped folding structure, the length of the filter after being folded is shorter, so that the total length of the filter is favorably shortened, and the application range of the filter is wider;

(3) the support pins are provided with at least one layer of outward positioning barbs, so that the implanted filter can be prevented from shifting, the hook bodies of the positioning barbs are formed by bending the tail ends of the support pins outwards, the integrity is better, the manufacturing cost is saved, the other layer of positioning barbs are welded at the connecting parts of the support pins and the umbrella-shaped filter screen, and the filter is positioned more firmly by the double layers of positioning barbs;

(4) the filter is well jointed with the blood vessel, is stable in support, is easy to take out after long-term implantation, can be used as a permanent filter for long-term implantation, and can also be used as a recyclable filter for short-term use.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of a conical screen with reverse curved ends;

fig. 3 is a schematic side view of the present invention;

fig. 4 is a schematic view of the structure of the proximal end face of the present invention.

In the figure: the device comprises a conical filter screen 1, a recovery hook groove 21, a recovery pipe 2, a support pin 3 and a positioning barb 4.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.

As shown in figures 1-4, the M-shaped recoverable venous thrombus filter is composed of a conical filter screen 1, a recovery pipe 2 and a support stitch 3;

the conical filter screen 1 is a hollow conical memory metal wire filter screen formed by laser cutting or weaving memory metal;

the tail ends of the memory metal wires around the opening of the conical filter screen 1 are reversely bent, each memory metal wire is provided with a supporting pin 3 after being bent, the supporting pins 3 are parallel to the central axis of the conical filter screen 1, the supporting pins 3 and the concave conical filter screen 1 jointly form a folding structure with an M-shaped section, at least one layer of outward positioning barbs 4 are arranged on the supporting pins 3, and each layer of positioning barbs 4 is formed by uniformly distributing a plurality of hook bodies in each direction;

a recovery pipe 2 is fixed at the center of the concave part of the conical filter screen 1, and a recovery hook groove 21 is arranged on the recovery pipe 2.

The conical filter screen 1 is made of nickel-titanium alloy material.

The support pins 3 are made of 316L stainless steel material or nitinol material.

Example 1

As shown in fig. 1, only one filter layer with positioning barbs 4 is provided. The tail end of the supporting pin 3 is provided with a layer of positioning barb 4, and the hook body of the positioning barb 4 is formed by bending the tail end of the supporting pin 3 outwards. The periphery of the opening of the conical filter screen 1 is provided with 6 bent memory metal wires and 6 supporting pins 3. Usually 6-8 curved memory wires and corresponding support stitches 3 are provided at the openings. The conical filter screen 1 and the supporting pins 3 are formed into an integral structure by laser cutting of memory metal or by welding.

Example 2

As shown in fig. 3, a filter is provided with a double layer of positioning barbs 4. Except that the tail end of the supporting pin 3 is provided with a layer of positioning barb 4, the connecting part of the supporting pin 3 and the conical filter screen 1 is provided with another layer of positioning barb 4, the hook body of the other layer of positioning barb 4 is welded on the outer side of the supporting pin 3, and the welded hook body is made of 316L stainless steel material or nickel-titanium alloy material.

The working principle is as follows:

before the filter is implanted, the filter is folded through an M-shaped folding structure to form a thin tubular structure; the filter is released to a preset position in the blood vessel through the thrombus filter releasing device, after the filter is released, the memory metal wire restores to a natural state, the blood vessel is propped up, and thrombus is filtered through the umbrella-shaped filter screen 1. During the recovery, the recovery hook groove 21 on the recovery pipe 2 is hooked by a special catcher, and the filter is taken out.

The filter adopts an open-loop design with an opening at one end, a plurality of supporting pins 3 are uniformly distributed along the circumferential direction, the supporting pins 3 play a supporting role in the circumferential direction to prevent the blood vessel from deforming, the open-loop design (an open structure is adopted at the far end) ensures that the filter can not be completely wrapped by the growth of the inner skin after being placed for a long time, and when the filter is taken out, the attached inner skin can slide out from the open end, so that the window period for taking out the filter is prolonged;

the near end of the filter adopts an M-shaped folding structure, and compared with a V-shaped folding structure, the length of the filter after being folded is shorter, so that the total length of the filter is favorably shortened, and the application range of the filter is wider;

the support pins 3 are provided with at least one layer of outward positioning barbs 4, so that the displacement of an implanted filter can be prevented, the hook bodies of the positioning barbs 4 are formed by bending the tail ends of the support pins 3 outwards, the integrity is better, the manufacturing cost is saved, the other layer of positioning barbs 4 is welded at the joint of the support pins 3 and the umbrella-shaped filter screen 1, and the filter is positioned more firmly by the double layers of positioning barbs 4;

the filter is well jointed with the blood vessel, is stable in support, is easy to take out after long-term implantation, can be used as a permanent filter for long-term implantation, and can also be used as a recyclable filter for short-term use.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An M-shaped recoverable venous thrombus filter is characterized by comprising a conical filter screen, a recovery pipe and support pins;

2. The M-shaped recyclable venous thrombosis filter as claimed in claim 1, wherein the conical filter mesh is made of nitinol.

3. The M-shaped retrievable venous thrombosis filter as recited in claim 1, wherein said support pins are made of 316L stainless steel material or nitinol material.

4. The M-shaped retrievable venous thrombosis filter as claimed in claim 1, wherein the end of the support pin is provided with a layer of positioning barbs, the hooks of the positioning barbs being formed by bending the end of the support pin outwards.

5. The M-shaped recyclable phlebothrombosis filter according to claim 1, wherein a layer of positioning barbs are arranged at the joint of the support pin and the conical filter screen, and hooks of the positioning barbs are welded outside the support pin.