CN112932730A

CN112932730A - Recoverable venous thrombus filter

Info

Publication number: CN112932730A
Application number: CN202110358162.2A
Authority: CN
Inventors: 高延彬; 何辉; 孙林龙; 吴瑶
Original assignee: Shanghai Sandy Medical Technology Co ltd
Current assignee: Shanghai Sandy Medical Technology Co ltd
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-06-11

Abstract

The invention discloses a recyclable venous thrombus filter, and belongs to the technical field of medical instruments. The recovery device comprises an umbrella-shaped filter screen and a recovery pipe, wherein the conical top end of the umbrella-shaped filter screen is used as a near end, and the recovery pipe is arranged at the near end of the umbrella-shaped filter screen; the umbrella-type filter screen is the toper by many memory metal silk and collects and connect at the recovery tube distal end, wherein, according to memory metal silk distal end to the axial distance of recovery tube, divide into memory metal silk by nearly to far away in proper order: a near-end filter screen layer, a middle filter screen layer and a far-end filter screen layer. And a filter screen layer with three layers of umbrella structures is adopted: the near-end filter screen layer plays a role in supporting and early positioning, the barb of the middle filter screen layer can prevent the filter from moving along the blood flow direction, and the reverse barb of the far-end filter screen layer can prevent the filter from moving along the reverse blood flow direction; the recovery pipe of this filter is last to set up three lamella formula and to retrieve the hook, easily is caught and is retrieved by filter recovery unit.

Description

Recoverable venous thrombus filter

Technical Field

The invention relates to a recyclable venous thrombus filter, and belongs to the technical field of medical instruments.

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 the advantage of being either permanently placed in the body as a permanent filter or removed as a non-permanent filter.

Currently, recyclable filters suffer from the following disadvantages: (1) the filter is easy to displace towards the far end or the near end after being implanted; (2) only one filter recovery hook is provided, and once the recovery hook is attached to the vessel wall or the upper endothelium is grown, the filter cannot be recovered. Therefore, the recyclable venous thrombus filter is designed, the displacement is not easy to generate through the structural cooperation of multiple layers with different functions, and the capture and the recycling of the recyclable filter are facilitated by adopting a multidirectional recycling structure.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a recyclable venous thrombosis filter, which solves the problems that the existing recyclable filter is easy to displace and inconvenient to recycle.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a recoverable venous thrombus filter comprises an umbrella-shaped filter screen and a recovery tube, wherein the conical top end of the umbrella-shaped filter screen is used as a near end, and the recovery tube is arranged at the near end of the umbrella-shaped filter screen;

the umbrella-type filter screen is the toper by many memory metal silk and collects and connect at the recovery tube distal end, wherein, according to memory metal silk distal end to the axial distance of recovery tube, divide into memory metal silk by nearly to far away in proper order: the device comprises a near-end filter screen layer, a middle filter screen layer and a far-end filter screen layer, wherein the far end of a memory metal wire in the near-end filter screen layer is folded inwards, the far end of the memory metal wire in the middle filter screen layer is provided with a barb, and the far end of the memory metal wire in the far-end filter screen layer is provided with a reverse barb;

the recovery pipe near-end is equipped with three lamella formula recovery hooks.

As a preferred example, the umbrella-shaped filter screen is composed of 12 memory metal wires, wherein the proximal filter screen layer is formed by uniformly distributing 6 memory metal wires, the middle filter screen layer is formed by uniformly distributing 3 memory metal wires, and the distal filter screen layer is formed by uniformly distributing 3 memory metal wires.

As a preferred example, the umbrella-shaped filter screen and the recovery tube are of an integral structure formed by a nickel-titanium material or 316L stainless steel through laser cutting or round wire weaving.

As a preferred example, the outer wall of the recovery pipe is provided with a recovery hook groove for accommodating a three-flap type recovery hook.

As a preferred example, the proximal end of the recovery tube is a spherical end surface.

As a preferred example, the proximal end of the recovery tube is provided with an end recovery hook.

The invention has the beneficial effects that:

(1) and a filter screen layer with three layers of umbrella structures is adopted: the filter is well jointed with the blood vessel, is stable in support, is not easy to displace, is not easy to grow the upper endothelium at the position in contact with the blood vessel, and is easy to take out after being implanted for a long time;

(2) the recovery pipe of the filter is provided with the three-petal recovery hook, so that the recovery pipe is easy to capture and recover by the filter recovery device, even if one side of the three-petal recovery hook is attached to the wall, only one petal is attached to the wall, and the other two petals are still beneficial to capture and recovery;

(3) the near end of the recovery tube is a spherical end surface, which is beneficial to leading the filter into a sheath tube of the recovery device during recovery.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic view of the proximal end face configuration of the present invention;

FIG. 4 is a schematic view of the structure of the memory wire in the proximal screen layer;

FIG. 5 is a schematic view of the configuration of the distal barbs of the memory wires in the middle screen layer;

FIG. 6 is a schematic view of the structure of the distal reverse barb of the memory wire in the distal screen layer;

FIG. 7 is a schematic view of the recovery tube and the three-piece recovery hook;

FIG. 8 is a schematic view of the proximal end of the recovery tube with an additional end recovery hook according to the present invention;

FIG. 9 is a schematic view of a proximal end with an additional end retrieval hook.

In the figure: the umbrella-shaped filter screen comprises an umbrella-shaped filter screen 1, a proximal filter screen layer 101, a middle filter screen layer 102, a distal filter screen layer 103, a barb 104, a reverse barb 105, a recovery pipe 2, a three-flap recovery hook 201, a recovery hook groove 202, a spherical end face 203 and an end recovery hook 204.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.

As shown in FIGS. 1-7, the "proximal end" as used herein is the end of the return tube of the present strainer and the "distal end" is the end of the umbrella screen of the present strainer.

Example 1

A recoverable venous thrombus filter comprises an umbrella-shaped filter screen 1 and a recovery tube 2, wherein the conical top end of the umbrella-shaped filter screen 1 is taken as a near end, and the recovery tube 2 is arranged at the near end of the umbrella-shaped filter screen 1;

umbrella-type filter screen 1 is the toper by many memory metal silk and collects and connect at recovery tube 2 distal ends, wherein, according to memory metal silk distal end to recovery tube 2's axial distance, divide into memory metal silk by nearly to far away in proper order: the filter screen comprises a near-end filter screen layer 101, a middle filter screen layer 102 and a far-end filter screen layer 103, wherein the far end of a memory metal wire in the near-end filter screen layer 101 is folded inwards, the far end of the memory metal wire in the middle filter screen layer 102 is provided with a barb 104, and the far end of the memory metal wire of the far-end filter screen layer 103 is provided with a reverse barb 105;

the proximal end of the recovery tube 2 is provided with a three-flap recovery hook 201.

Example 2

The umbrella-shaped filter screen 1 is composed of 12 memory metal wires, wherein the near-end filter screen layer 101 is formed by uniformly distributing 6 memory metal wires, the middle filter screen layer 102 is formed by uniformly distributing 3 memory metal wires, and the far-end filter screen layer 103 is formed by uniformly distributing 3 memory metal wires. The barb 104 at the distal end of the middle screen layer 102 is formed by bending a wire; the reverse barbs 105 at the distal end of the distal screen layer 103 are formed by welding reverse barbs at the distal end of the memory wire.

Example 3

The umbrella-shaped filter screen 1 and the recovery pipe 2 are of an integrated structure formed by a nickel-titanium material or 316L stainless steel through laser cutting or round wire weaving.

Example 4

The outer wall of the recovery pipe 2 is provided with a recovery hook groove 202 for accommodating the three-flap recovery hook 201, and the three-flap recovery hook 201 is stored in the recovery groove 202 when released and recovered, so that the recovery pipe is easy to convey. The proximal end of the recovery tube 2 is a spherical end surface 203. Is favorable for guiding the filter into the sheath tube of the recovery device during recovery.

Example 5

As shown in fig. 8 and 9, the proximal end of the recovery tube 2 is provided with an end recovery hook 204. In addition to the three-flap type recovery hook 201, the end recovery hook 204 additionally arranged at the proximal end of the recovery tube 2 can further improve the capturing success rate. Compared with the three-flap type recovery hook 201, when the three-flap type recovery hook 201 is blocked by thrombus or blood vessel and is not convenient to be sheathed, the end recovery hook 204 positioned at the near end is not easy to be blocked, and the end recovery hook 204 positioned at the near end can be used as a backup hook of the three-flap type recovery hook 201.

The working principle is as follows:

and a filter screen layer with three layers of umbrella structures is adopted: the near-end filter screen layer 101 plays a role in positioning the filter in the early stage of release and supporting the filter after complete release, the barb 104 of the middle filter screen layer 102 can prevent the filter from moving along the blood flow direction, the reverse barb 105 of the far-end filter screen layer 103 can prevent the filter from moving along the reverse blood flow direction, the filter is well attached to a blood vessel, is stable in support and not easy to displace, does not easily grow an upper endothelium at the position where the filter is in contact with the blood vessel, and is easy to take out after long-term implantation;

set up three lamella formulas on the recovery tube 2 of this filter and retrieve hook 201, easily by filter recovery unit capture and retrieve, even three lamella formulas retrieve hook 201 wherein one side adherence wall, also can only cause one of them lamella adherence wall, two other lamellas still do benefit to capture and retrieve, when retrieving, use lasso recovery tool to entangle recovery tube 2, then tighten up the lasso, three lamella formulas on the recovery tube 2 are retrieved hook 201 and can be caught the lasso, capture the success rate higher.

The proximal end of the recovery tube 2 is a spherical end 203 surface which is beneficial to leading the filter into a sheath tube of the recovery device during recovery.

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

Claims

1. The utility model provides a recoverable vein thrombus filter, it includes umbrella-shaped filter screen and recovery tube to the toper top of umbrella-shaped filter screen is the near-end, and the recovery tube is established in the near-end of umbrella-shaped filter screen, its characterized in that:

2. The recyclable venous thrombosis filter as claimed in claim 1, wherein the umbrella-shaped filter screen is composed of 12 memory metal wires, wherein the proximal filter screen layer is composed of 6 memory metal wires which are uniformly distributed, the middle filter screen layer is composed of 3 memory metal wires which are uniformly distributed, and the distal filter screen layer is composed of 3 memory metal wires which are uniformly distributed.

3. The recyclable venous thrombosis filter as claimed in claim 1, wherein the umbrella-shaped filter screen and the recycling pipe are an integral structure formed by a nickel titanium material or 316L stainless steel through laser cutting or round wire weaving.

4. The recyclable phlebothrombosis filter according to claim 1, wherein the outer wall of the recycling pipe is provided with a recycling hook groove for accommodating a three-flap type recycling hook.

5. The retrievable venous thrombosis filter as defined in claim 1, wherein said proximal end of said retrieval tube is a spherical end surface.

6. The retrievable venous thrombosis filter as defined in claim 1, wherein the proximal end of the retrieval tube is provided with an end retrieval hook.