CN209770586U - Vena cava filter easy to recycle and having multi-layer spiral filter screen structure - Google Patents

Abstract

the utility model belongs to the technical field of medical appliances, and relates to an easily-recycled vena cava filter with a multi-layer spiral filter screen structure, in particular to a recyclable filter device which is arranged in a human body vena cava and is used for capturing and filtering thrombus; the structure of the device comprises a filtering structure, a supporting structure and a recovery structure; wherein the filtering structure and the supporting structure are both made of nickel-titanium alloy materials and are formed by laser engraving of pipes; the recovery structure is realized by cutting the pipe fitting and the heat setting material by laser; the filter structure comprises a spiral filter screen and two vortex filter screens, and adopts a spiral structure; the support structure comprises a support rod and a spiral support body, and two vortex type filter screens are fixed; barbs are arranged on the outer side of the circumferential support body; the thrombus filter has the advantages of scientific structural design, good scalability, convenient implantation and recovery, capability of filtering thrombus for multiple times, capability of ensuring smoothness of blood flow, good filtering effect, strong stability, difficult deviation and environment-friendly application.

Description

Vena cava filter easy to recycle and having multi-layer spiral filter screen structure

The technical field is as follows:

The utility model belongs to the technical field of medical instrument, a easily retrieve vena cava filter with multilayer screw-tupe filter screen structure is related to, specifically be one kind arrange human body cavity vein blood vessel in for catch and filter the recoverable filter device of thrombus.

Background art:

In people living in modern society, due to the effects of high living pressure, irregular work and rest, unhealthy diet and the like, the formation of deep venous thrombosis of lower limbs becomes a common clinical disease, which is also one of the important causes of pulmonary artery embolism, and the death rate and disability rate of the pulmonary artery embolism caused by venous thrombosis are always high. The implementation of the anticoagulation treatment of thrombus is always the gold standard for treating venous thrombosis, and aims to prevent thrombosis, prevent pulmonary artery embolism and restore the smoothness of embolism veins, but when patients have anticoagulation contraindications or bleeding complications and other phenomena occur during the anticoagulation treatment, the treatment can only be given up by the anticoagulation scheme of thrombus. The clinical use of venous filters is now becoming more common as the artificial placement of the inferior vena cava filter in the clinic becomes another effective therapeutic approach for filtering thrombi and preventing pulmonary embolism. The basic working principle of the venous filter is to trap and intercept a potentially fatal large or large thrombus in the vein by means of a filter mesh placed at the vena cava, thereby preventing the thrombus from entering the blood circulation of the lungs and preventing the occurrence of fatal pulmonary embolism.

The vena cava filters commonly used in the prior art are classified into permanent vena cava filters and recyclable vena cava filters. Permanent vena cava filters have been used clinically for over 40 years, with the major drawback that once implanted in a human vein they cannot be removed again; thus, although permanent vena cava filters reduce the incidence of pulmonary embolism, they also present long-term complications such as inferior vena cava thrombosis, recurrence, and venous reflux disorder. In order to improve the using effect of the filter, reduce the influence of complications and ensure that the thrombolytic therapy is safer, people continuously propose a new design scheme for the filter or modify and improve the existing filter so as to promote the occurrence of various non-permanent filters and gradually enlarge the implantation indications of the filter, wherein the most widely used recyclable vena cava filter can effectively reduce the incidence rate of long-term complications; when the risk factor of pulmonary artery embolism persists, a large thrombus exists in the filter or the recovery fails, the recyclable vena cava filter can be used as a permanent filter to be left in the body, and if the risk factor of pulmonary artery embolism does not exist, the filter can be taken out after the expiration of the risk period. However, after its large-scale clinical application, it has been found that the removable filter still has serious defects such as filter displacement, blood vessel perforation and filter fracture, and there are more and more cases of complications such as infection caused by these defects. Chinese utility model patent application No. CN206499550U discloses a vena cava filter device, and this application only designs one deck filtration structure, and does not solve the problem of low capture efficiency. Chinese utility model patent application No. CN2001123855Y discloses a blood vessel filter device, and this application has only designed one deck filtration structure, and does not solve the problem of catching inefficiency and filter recoverability.

Therefore, it is necessary to design a novel recyclable filter which has a small outer diameter, a small surgical wound, a good filtering effect, and excellent stability, and can prevent the filter from generating surgical risks and complications due to asymmetric deformation, inclination and the like under the continuous impact of blood flow.

The invention content is as follows:

The invention aims to overcome the defects in the prior art, and seeks to design an easily-recycled vena cava filter which can effectively filter thrombus, can be well attached to the wall surface of a blood vessel, has small outer diameter and small surgical wound, is not easy to break, deform and tilt and has a multi-layer spiral filter net structure.

In order to achieve the above object, the main structure of the vena cava filter with multiple layers of spiral filter screens of the present invention comprises: the recovery hook, the spiral filter screen, the vortex filter screen, the support rod, the support body and the barb; the recovery hook is welded with the upper end of the spiral filter screen, and the upper end of the spiral filter screen is welded with the upper end of the support rod; the lower end of the spiral filter screen is smoothly connected with the support body; the outer end of the vortex type filter screen is smoothly connected with the spiral line type support body; the inner end of the vortex type filter screen is connected with the support rod; wherein the recovery hook is used for recovering a filter accumulated by thrombus; the spiral filter screen and the vortex filter screen are used for filtering thrombus in blood; the support rod is used for supporting and fixing the vortex-shaped filter screen; the supporter be the heliciform for supporting the filter, be favorable to the scaling and the location of filter, be convenient for implant and retrieve the operation in vena cava, and make it can not take place the angular deflection, the barb is used for the filter fixed in the blood vessel, prevents to take place the aversion.

The vena cava filter easy to recycle with the multilayer spiral filter screen structure has the advantages that the fixing barbs are arranged on the outer sides of the supporting bodies, so that the fixity of the filter at a diseased part is favorably improved, the filter is prevented from sliding or being washed away by blood flow, and the anchoring force between the filter and a vascular wall is increased; the bracing piece link to each other with two swirl type filter screens and recovery hook respectively, can play the effect of supporting and fixed swirl type filter screen, prevent that swirl type filter screen from shifting in the blood vessel, improved the filter effect of filter in blood.

The whole length of the vena cava filter easy to recover with the multi-layer spiral filter screen structure is 60mm, and the diameter of the filter released in the blood vessel is 25 mm. The diameters of the spiral filter screen and the vortex filter screen are both 0.4mm, and the diameters of the support rod and the support body are both 0.4 mm.

The vena cava filter easy to recycle of the multi-layer spiral filter screen structure can be classified into a supporting structure, a filtering structure and a recycling structure; the recovery structure mainly comprises a recovery hook; the filter structure comprises a spiral filter screen and two vortex filter screens, and a three-layer filter screen structure is formed, so that multiple times of filtering are realized; the supporting structure comprises a supporting rod and a spiral line type supporting body, and barbs are arranged on the outer side of the supporting body, so that the supporting structure plays a role in supporting, fixing and preventing displacement.

the vena cava filter main body structure easy to recover with the multilayer spiral filter screen structure of the utility model is made of nickel-titanium alloy super elastic material through laser engraving, welding and heat setting, and has good flexibility and supporting performance; the supporting structure and the filtering structure are formed by laser engraving, and the recovery structure is realized by laser cutting of the pipe fitting and heat setting of the material; two vortex type filter screens with vortex type structures which are easy to process are arranged in the related filter structure, and the vortex type filter screens and the related filter structure are manufactured into a whole by adopting winding die weaving and laser engraving technologies and can be well linked with a spiral line type support body; the spiral filter screen and the support body are welded together by laser or plasma.

Compared with the prior art, the utility model has the advantages that the multilayer filter screen comprises a supporting structure, a filtering structure and a recovery structure, the nickel-titanium alloy super-elastic material is used as the raw material, the filter screen is formed by laser engraving, welding and heat setting, and the spiral supporting body structure is adopted, so that the filter can be conveniently scaled and positioned, the angular deviation can not occur, the implantation and the recovery are convenient, the complications such as blood vessel blockage caused by thrombus accumulation can be favorably reduced, and the purpose of smooth blood flow can be realized; the novel support is scientific in design principle, simple in main structure, good in flexibility, strong in support performance, not prone to breaking and deformation and friendly in application environment.

Description of the drawings:

Fig. 1 is a schematic view of the overall structure of the vena cava filter according to the present invention.

fig. 2 is a schematic front plan view of the vena cava filter according to the present invention.

The specific implementation mode is as follows:

The invention is further illustrated by the following specific examples and the accompanying drawings.

Example 1:

the vena cava filter easy to recycle of the multi-layer spiral filter screen structure comprises a main structure as follows: the device comprises a recovery hook 1, a spiral filter screen 2, a vortex filter screen 3, a support rod 4, a support body 5 and barbs 6. The recovery hook 1 is welded with the upper end of the spiral filter screen 2, and the upper end of the spiral filter screen 2 is welded with the upper end of the support rod 4; the lower end of the spiral filter screen 2 is smoothly connected with the support body 5; the outer end of the vortex type filter screen 3 is smoothly connected with the support body 5; the inner end of the vortex type filter screen 3 is connected with a support rod 4; wherein the recovery hook 1 is used for recovering a filter accumulated by thrombus; the spiral filter screen 2 and the vortex filter screen 3 are used for filtering thrombus in blood; the support rod 4 is used for supporting and fixing the vortex-shaped filter screen 3; the support body 5 be the heliciform for supporting the filter, be favorable to the scaling and the location of filter, be convenient for implant and retrieve the operation in vena cava, and make it can not take place the angular deflection, barb 6 is used for the filter fixed in the blood vessel, prevents to take place the aversion.

In the vena cava filter with the multilayer spiral filter screen structure and easy to recycle, the fixing barbs are arranged on the outer side of the support body 5, so that the fixation of the filter at a pathological change part is improved, the filter is prevented from slipping or being washed away by blood flow, and the anchoring force between the filter and a blood vessel wall is increased; the support rod 4 is respectively connected with the two vortex type filter screens 3 and the recovery hook 1, so that the vortex type filter screens 3 can be supported and fixed, the vortex type filter screens 3 are prevented from shifting in blood vessels, and the filtering effect of the filter in blood is improved. When the filtered thrombus is saturated, the recovery hook 1 is sleeved by a recovery device and taken out of the body, thereby ensuring the smoothness of blood flow.

The vena cava filter easy to recycle of the multi-layer spiral filter screen structure is 60mm in overall length, 25mm in diameter released into a blood vessel, and 0.4mm in diameter of the spiral filter screen 2, the spiral filter screen 3, the support rod 4 and the support body 5.

example 2:

the main structure of the easily recyclable vena cava filter of the multi-layer spiral filter screen structure described in this example is the same as that of example 1, and this example is mainly used to describe the preparation process and materials used.

The vena cava filter easy to recycle of the multilayer spiral filter screen structure can be classified into a supporting structure, a filtering structure and a recycling structure; the recovery structure mainly comprises a recovery hook 1; the filter structure comprises a spiral filter screen 2 and two vortex filter screens 3, and a three-layer filter screen structure is formed, so that multiple times of filtering are realized; the supporting structure comprises a supporting rod 4 and a spiral line type supporting body 5, and barbs 6 are arranged on the outer side of the supporting body 5, so that the supporting, fixing and displacement preventing effects are achieved.

The main body structure of the easy-to-recover vena cava filter with the multilayer spiral filter screen structure is made of a nickel-titanium alloy super-elastic material through laser engraving, welding and heat setting, and has good flexibility and supporting performance; the supporting structure and the filtering structure are formed by laser engraving, and the recovery structure is realized by laser cutting of the pipe fitting and heat setting of the material; two vortex type filter screens 3 which are easy to process and have vortex type structures are arranged in the related filter structure, and the vortex type filter screens 3 and the spiral type support body 5 can be well linked by adopting winding mold weaving and laser engraving technologies to integrate the two; the spiral filter screen 2 and the support body 5 are welded together by laser or plasma.

Claims (3)

1. The utility model provides an easy recovery vena cava filter of multilayer spiral filter screen structure which characterized in that major structure includes: the spiral filter screen comprises a recovery hook (1), a spiral filter screen (2), a vortex filter screen (3), a support rod (4), a support body (5) and barbs (6), wherein the recovery hook (1) is connected with the upper end of the spiral filter screen (2), and the lower end of the spiral filter screen (2) is smoothly connected with the support body (5); the outer end of the vortex type filter screen (3) is smoothly connected with the support body (5); the inner end of the vortex type filter screen (3) is connected with the support rod (4); the support rod (4) is respectively connected with the two vortex type filter screens (3) and the recovery hook (1).

2. an easily recoverable vena cava filter according to claim 1 wherein said support (5) is in the form of a helix.

3. An easily recoverable vena cava filter according to claim 1 having a multi-layer spiral filter structure, wherein the overall length of the filter is 60mm and the diameter of the filter when released into a blood vessel is 25 mm; the diameters of the spiral filter screen (2) and the vortex filter screen (3) are both 0.4mm, and the diameters of the support rod (4) and the support body (5) are both 0.4 mm.