CN203841850U

CN203841850U - Withdrawable inferior vena cava filter

Info

Publication number: CN203841850U
Application number: CN201420153312.1U
Authority: CN
Inventors: 孙媛
Original assignee: Individual
Current assignee: Kossel Medtech Suzhou Co ltd
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2014-09-24
Anticipated expiration: 2024-03-31

Abstract

The utility model relates to a withdrawable inferior vena cava filter. The withdrawable inferior vena cava filter comprises a withdrawing hook, a balance arm, a filter screen, a supporting leg and a fixed barb. The withdrawable inferior vena cava filter is characterized in that the withdrawing hook is arranged at the head end of the filter, the interior of the withdrawing hook is a hollow cavity of a metal tube, the balance arm is arranged on the tube wall of the hollow cavity, the diamond-shaped unit filter screen extends from the rear end of the withdrawing hook, the supporting leg is arranged at the tail end of the filter screen and the fixed barb is arranged at an end portion of the supporting leg. The balance arm is embedded in the tube wall of the hollow cavity so that the outer diameter of the filter is overall reduced, and therefore, a wound cut in an operation on a patient is small; besides, for withdrawal, the balance arm is firstly withdrawn and the arm to the blood vessel wall also can be reduced, and the patient can recover quickly; meanwhile, the designed structure of the balance arm also enables the implanted filter to have excellent stability, and surgical risks and complications caused by the dissymmetry (deformation), tilting and the like of the filter can be prevented even under continuous impact of the blood flow.

Description

A kind of recyclable IVCF

Technical field

This utility model belongs to medical instruments field, relates in particular to a kind of recyclable filter that body cavity vein blood vessel catches thrombosis that is placed in.

Background technology

Deep venous thrombosis of lower limbs (deep venous thrombosis, DVT) is clinical common disease, is also to cause the topmost reason of pulmonary embolism (pulmonary embolism, PE).Pulmonary infarction mortality rate, disability rate are high.Inserting of IVCF (inferior vena cava filter, IVCF) can effectively prevent pulmonary embolism, and its ultimate principle is to catch large mortality embolus by being placed on the filter screen at caval vein place, avoids it to enter pulmonary circulation.The use of vein filter is now more and more extensive.In order to improve the result of use of filter, reduce the impact of complication, make thromboembolism treatment safer, people constantly propose new design to filter, or existing filter is modified and improved.

Now design a kind of new filter, its feature is: filter external diameter is little, and wound during operation is little, and the wound of bringing to patient is accordingly just little; There is excellent stability simultaneously, under the continuous impact of blood flow, also can prevent that operation risk and complication that asymmetric (distortion), inclination etc. bring from appearring in filter.

Utility model content

To achieve these goals, technical solution of the present utility model is as follows: a kind of novel vena cava filter comprises: recovering hook, drainage screen, counter-jib, supporting leg and fixedly barb.

Described filter main body adopts the metal pipe material cut of ultra-strong elasticity memory function to form; The head end of described filter is provided with recovering hook; The processing technique of described recovering hook is formed by the cutting of laser screw type; The inside of described recovering hook is the hollow cavity of metal tube; Described hollow cavity tube wall is provided with counter-jib; Described counter-jib is connected on hollow cavity tube wall by Plasma Welding mode; Described counter-jib is comprised of elastic memory function wire rod; Described wire rod quantity is 3 or 6; Described wire rod links together by the processing mode of laser weld or Plasma Welding; Described wire rod arrangement mode is along filter axis decile; Described wire rod is " S " type structure; The rear end extension of described recovering hook is provided with drainage screen; Described drainage screen is that the diamond-shaped element of 6 enclosed constructions forms; Described diamond-shaped element, under release conditions, is conical-surface type; Described diamond-shaped element extension is provided with 6 supporting legs; Described supporting leg is uniformly distributed along filter axis; Described supporting leg end is provided with fixedly barb; The quantity of described fixedly barb is less than or equals the quantity of supporting leg; Described fixedly barb direction is outside back to central shaft.

From above-mentioned technical scheme, can find out, the advantage of IVCF of the present utility model is:

This utility model diminishes filter external diameter by the embedded design of counter-jib, and the wound not only causing to patient when operation is just little, when reclaiming, because counter-jib first reclaims, also can reduce the damage to blood vessel wall equally, is conducive to patient's rehabilitation;

This utility model adopts counter-jib structure, makes filter after implantation, have excellent stability, also can prevent that operation risk and complication that asymmetric (distortion), inclination etc. bring from appearring in filter under the continuous impact of blood flow;

This utility model is recyclable filter, the complication of effectively having avoided permanent filter to bring;

In this utility model, diamond-shaped element forms filter screen structure, can effectively carry out thrombosis seizure;

The design of fixedly barb in this utility model can effectively reduce the displacement risk that the impact of blood flow brings to filter.

Accompanying drawing explanation

In order to be illustrated more clearly in this utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be done to simple introduction below, obviously, these accompanying drawings are only some specific embodiment of a kind of novel vena cava filter recorded of the application.This utility model include but not limited to following these.

Fig. 1 is the schematic perspective view of this utility model embodiment mono-;

Fig. 2 is the schematic perspective view of this utility model embodiment bis-;

Fig. 3 is the split schematic diagram of this utility model embodiment mono-;

Fig. 4 is the side schematic view of this utility model embodiment bis-;

Fig. 5 is the schematic top plan view of this utility model embodiment bis-;

Fig. 6 is the schematic top plan view of this utility model embodiment mono-;

Fig. 7 is the structure for amplifying schematic diagram of I part in Fig. 6;

Schematic diagram before Fig. 8 this utility model recovery state;

Fig. 9 this utility model partly reclaims view.

The specific embodiment

In order to make object, technical scheme and the advantage of utility model clearer, referring to the accompanying drawing embodiment that develops simultaneously, this utility model is elaborated.

From Fig. 1, Fig. 2 and Fig. 4, can find out that a kind of novel vena cava filter head end is provided with recovering hook 1, the inside of recovering hook 1 is the hollow cavity of metal tube, hollow cavity tube wall 6 is provided with counter-jib 2, diamond-shaped element drainage screen 3 is extended in recovering hook 1 rear end, drainage screen 3 ends are provided with supporting leg 4, supporting leg 4 ends are provided with fixedly barb 5, and fixedly barb 5 directions are outside back to central shaft.

Feature of the present utility model is that counter-jib 2 is embedded on the hollow cavity tube wall 6 in filter main body, see Fig. 3 and Fig. 7, filter external diameter integral body is diminished, the wound causing to patient while performing the operation is like this just little, and, in removal process, push recovery tube sheath 9, catching device 8 entangles recovering hook 1, see Fig. 8, recession catching device 8, is shown in Fig. 9, and counter-jib 2 is drawn back from blood vessel wall 7, prior to fixing barb 5, enter in recovery tube sheath 9, avoid counter-jib 2 and fixedly barb 5 pull the phenomenon of blood vessel wall simultaneously, reduced the damage to blood vessel wall 7, be conducive to patient's rehabilitation; The project organization of counter-jib 2, makes filter after implantation, have excellent stability, also can prevent that operation risk and complication that asymmetric (distortion), inclination etc. bring from appearring in filter under the continuous impact of blood flow.

Filter body described in the utility model is to adopt the metal pipe material cut of ultra-strong elasticity memory function to form, and is cone-shaped, and wherein the processing technique of recovering hook 1 is formed by the cutting of laser screw type, sees Fig. 4.Counter-jib 2 is comprised of elastic memory function wire rod, can form for 6 wire rods, see embodiment mono-Fig. 1 and Fig. 6, also can form for 3 wire rods, see embodiment bis-Fig. 2 and Fig. 5, wire rod is " S " type structure, and the processing mode by laser weld or Plasma Welding links together and along filter axis decile; Counter-jib 2 is connected on hollow cavity tube wall 6 by Plasma Welding mode, sees Fig. 7.Diamond-shaped element drainage screen 3 in filter main body is made as 6.The quantity of supporting leg 4 is identical with the quantity of drainage screen 3.Fixedly the quantity of barb 5 is less than or equals the quantity of supporting leg 14, can be 3～6.

Finally should be noted that; the foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. a recyclable IVCF, include recovering hook, counter-jib, drainage screen, supporting leg and fixing barb, it is characterized in that: filter head end is provided with recovering hook, the inside of recovering hook is the hollow cavity of metal tube, hollow cavity tube wall is provided with counter-jib, diamond-shaped element drainage screen is extended in recovering hook rear end, and drainage screen end is provided with supporting leg, and supporting leg end is provided with fixedly barb.

2. IVCF according to claim 1, is characterized in that, described filter main body adopts the metal pipe material cut of ultra-strong elasticity memory function to form.

3. IVCF according to claim 1, is characterized in that, described recovering hook is cut by laser screw type.

4. IVCF according to claim 1, is characterized in that, described counter-jib is connected on hollow cavity tube wall by Plasma Welding mode.

5. according to the IVCF described in claim 1 or 4, it is characterized in that, described counter-jib is comprised of elastic memory function wire rod, is " S " type structure.

6. IVCF according to claim 5, is characterized in that, described wire rod quantity is 3 or 6, along filter axis decile, arranges.

7. IVCF according to claim 5, is characterized in that, described wire rod links together by laser weld or Plasma Welding.

8. IVCF according to claim 1, is characterized in that, described drainage screen is comprised of the diamond-shaped element of 6 enclosed constructions.

9. IVCF according to claim 1, is characterized in that, the quantity of described supporting leg is 6, along filter axis, is uniformly distributed.

10. IVCF according to claim 1, is characterized in that, the quantity of described fixedly barb is less than or equals the quantity of supporting leg, and direction is outside back to central shaft.