CN111096822A

CN111096822A - Vein filter recovery catcher

Info

Publication number: CN111096822A
Application number: CN201811556000.4A
Authority: CN
Inventors: 方萍
Original assignee: Shanghai Sandy Medical Technology Co ltd
Current assignee: Shanghai Sandy Medical Technology Co ltd
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2020-05-05

Abstract

The invention discloses a vein filter recovery catcher, and belongs to the technical field of vein filter catchers. The expanded catching net is a horn-shaped net structure woven by memory metal wires, the small opening end of the expanded catching net is connected with the end part of the inner pipe, the outer pipe is pushed forwards along the inner pipe, and the bell mouth of the bound expanded catching net shrinks to be small. The expansion catching net is woven by nickel-titanium wires, can self-expand to the size of a blood vessel within the temperature range of a human body after being subjected to heat treatment and shaping, and can adhere to the blood vessel; the bell mouth of the expansion catching net is provided with the catching teeth which are bent inwards, so that the catching success rate is further improved; the expansion catching net is woven by nickel titanium wires, catching is carried out in the circumferential direction during recovery, the barb of the filter recovery pipe can be easily caught in any position, and the filter cannot be loosened in the recovery process due to catching in the circumferential direction.

Description

Vein filter recovery catcher

Technical Field

The invention relates to a vein filter recovery catcher, and belongs to the technical field of vein filter catchers.

Background

The incidence of Deep Vein Thrombosis (DVT) formation, which once sloughed off, can enter and occlude the pulmonary arteries with the blood stream, leading to the clinical manifestation of pulmonary artery thromboembolism (PE), is increasing daily, and in the united states, the incidence of DVT is about 1/1000 people per year. Approximately 1/3 untreated symptomatic patients were pooled into PE.

The most effective physical therapy for preventing PE is the placement of a thrombus filter intravenously. The thrombus filter is divided into two types: permanent filters or recyclable filters. The permanent filter is used for providing a lifelong filtering function, has the maximum lumen vein intimal fixation force, and has research to prove 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, secondary thrombus causing 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. However, the disadvantage is that the filter is placed in vivo as a non-permanent filter in a short time window, generally only 2 weeks, and the filter is adhered to the vessel wall and is not easy to be taken out due to endothelialization caused by the barb, and clinical data at home and abroad show that the recoverable filter which can be successfully taken out is less than 30%, most of the recoverable filter is left in vivo, so that the advantages of the selectable filter are not highlighted. And its removal requires more complicated operating techniques and additional equipment, increasing the cost of treatment.

The recoverable filter comprises a recovery pipe, a filter screen and a tail pipe, wherein the filter screen is a hollowed spindle-shaped structure which is formed by laser cutting or weaving of memory metal, the recovery pipe is fixed at the lower end of the filter screen, the tail pipe is fixed at the top end of the filter screen, barbs which are convenient to grab are arranged on the recovery pipe, and when the filter is recovered, the barbs on the recovery pipe are grabbed by a grabber, so that the filter is taken out of a human body.

At present, the barb structure on the recovery pipe is simple, only one hook groove is provided, and the hook groove needs to be hooked by the catcher from a specific direction when the catcher catches. This approach requires precise sensing of the barb position, as well as precise control of the lasso movement, to complete the capture operation. Therefore, in the actual operation process, the recovery pipe of the filter is captured through a plurality of operations. The catching difficulty of the filter recovery tube is higher, the operation time is prolonged, and the operation risk is increased. Therefore, a vein filter recovery catcher is designed, which can complete the catching operation quickly.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a vein filter retrieves and catches ware, it has solved present vein filter and catches ware operation degree of difficulty height, catches the problem that the success rate is low.

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

the vein filter recovery and capture device comprises an inner pipe, an outer pipe and an expansion capture net, wherein the inner pipe is sleeved in the outer pipe, the expansion capture net is of a horn-shaped net structure woven by memory metal wires, the small opening end of the expansion capture net is connected with the end part of the inner pipe, the outer pipe is pushed forwards along the inner pipe, and the horn mouth for binding the expansion capture net is reduced in contraction.

As a preferable example, the expansion catching net is woven by nickel titanium wires, and is shaped by heat treatment, the expansion catching net self-expands within the temperature range of a human body, and the diameter of the widest part of the expansion catching net after self-expansion is equal to the inner diameter of a blood vessel.

As a preferred example, a plurality of catching teeth are woven on the circumference of the bell mouth of the expansion catching net, and the catching teeth are bent inwards to the opening.

The invention has the beneficial effects that:

(1) the expansion catching net is woven by nickel-titanium wires, can self-expand to the size of a blood vessel within the temperature range of a human body after being subjected to heat treatment and shaping, and can adhere to the blood vessel;

(2) the bell mouth of the expansion catching net is provided with the catching teeth which are bent inwards, so that the catching success rate is further improved;

(3) the expansion catching net is woven by nickel-titanium wires, catching is carried out in the circumferential direction during recovery, the barb of the filter recovery pipe can be easily caught no matter at any position, and the filter cannot be loosened in the recovery process due to catching in the circumferential direction;

(4) the catcher can be selectively introduced from the femoral vein or from the upper part of the renal vein according to the specific structure of the filter;

(5) the catching device can be used as a temporary thrombus catching device, is guided in from the upper part of the renal vein, and can block and catch thrombus and prevent the thrombus from leaking.

Drawings

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

FIG. 2 is a schematic view of the present invention introduced from the femoral vein;

FIG. 3 is a schematic view of the present invention introduced from above the renal vein;

fig. 4 is a schematic view of the expanded catching net from above.

In the figure: the device comprises an inner tube 1, an outer tube 2, an expansion catching net 3, catching teeth 31, a filter 4, a femoral vein 5 and a renal vein 6.

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 fig. 1-4, the venous filter recovery capturing device comprises an inner tube 1, an outer tube 2 and an expansion capturing net 3, wherein the inner tube 1 is sleeved in the outer tube 2, the expansion capturing net 3 is a horn-shaped net structure woven by memory metal wires, the small-opening end of the expansion capturing net 3 is connected with the end part of the inner tube 1, the outer tube 2 is pushed forwards along the inner tube 1, and the horn-shaped opening for binding the expansion capturing net 3 is reduced in contraction.

The expansion catching net 3 is woven by nickel-titanium wires, and after heat treatment and shaping, the expansion catching net 3 self-expands within the temperature range of a human body, and the diameter of the widest part of the expansion catching net 3 after self-expansion is equal to the inner diameter of a blood vessel.

A plurality of catching teeth 31 are woven on the bell mouth circumference of the expansion catching net 3, and the catching teeth 31 are bent towards the opening.

The expansion catching net 3 is woven by nickel-titanium wires, can self-expand to the size of a blood vessel within the temperature range of a human body after being subjected to heat treatment and shaping, and can adhere to the blood vessel; the bell mouth of the expansion catching net 3 is provided with the catching teeth 31 which are bent inwards, so that the catching success rate is further improved; the expansion catching net 3 is woven by nickel titanium wires and catches from the circumferential direction during the recovery, the barb of the recovery pipe of the filter 4 can be easily caught at any position, and the filter 4 cannot be loosened during the recovery process due to the catching from the circumferential direction; the trap may be selectively introduced from the femoral vein 5, as shown in figure 2, depending on the particular configuration of the filter 4; as shown in fig. 3, the introduction is performed from above the renal vein 6; the catcher can be used as a temporary thrombus catcher and is led in from the upper part of the renal vein 6, so that thrombus can be blocked and caught, and the thrombus is prevented from leaking.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. 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 ware is arrested in vein filter recovery which characterized in that: the expanded catching net is a horn-shaped net structure woven by memory metal wires, the small opening end of the expanded catching net is connected with the end part of the inner pipe, the outer pipe is pushed forwards along the inner pipe, and the bell mouth of the bound expanded catching net shrinks to be small.

2. A venous filter recovery trap as claimed in claim 1 wherein: the expansion catching net is woven by nickel-titanium wires, and the diameter of the widest part of the expansion catching net after self expansion is equal to the inner diameter of the blood vessel.

3. A venous filter recovery trap as claimed in claim 1 wherein: and a plurality of catching teeth are woven on the circumference of the bell mouth of the expansion catching net and are bent towards the opening.