A kind of ultrashort type bilayer vena cava filterTechnical field
The invention patent relates to a kind of cardiovascular system medical instrument, in specifically a kind of recyclable filter chamber venous systemSwim thrombus, prevents pulmonary embolism, the Caval vein thrombus filter that pulmonary infarction occurs.
Background technology
The vena cava filter product design structure occurred at present in the market mainly has umbrella-shaped structure and lantern-shaped structure veinFilter is distributed between 45mm~70mm after the length expansion of product.Product expansion after structure it is longer to vein blood vessel damageArea is bigger, and the product with recycling hook, recycling hook is also bigger by the probability of vascular wall endometrial hyperplasia tissue coverage, makesIt is also bigger come the risk recycled that recycling hook is not easily passed through at vena cava filter.
Invention content
After product is implanted to vena cave blood vessel in order to prevent, product recycles the damage of venous blood tube wall and later productHook is covered by vascular wall endometrial hyperplasia tissue, and technical solution of the invention is：It is quiet to provide a kind of ultrashort type bilayer chamberArteries and veins filter, outer layer play a supportive role, and internal layer plays filtering thrombus.The product length only has 25~30mm upon inflation, significantlyThe contact area for reducing product and venous blood tube wall, to reduce the hyperplasia area of venous blood tube wall contact site.Furthermore it producesProduct length is ultrashort, and the probability contacted with product head end recycling hook when venous blood tube wall is shunk after implantation becomes smaller, to anti-non-returnIt receives hook to be covered by vascular wall neointimal tissue proliferation, causing cannot recovered hook recycling product.
The present invention is mainly made of internal layer filter screen and outer layer supporting network two parts, and outer layer supporting network is linked up with by recycling, releasedPut attaching nut, outer layer supporting rod, hangnail composition；Internal layer filter screen is made of diamond shape filter screen and connecting tube.
Outer layer supporting network recycling hook, outer layer supporting rod, hangnail are formed by Nitinol pipe through laser engraving.
Release attaching nut is process by nickel-titanium alloy material, is linked up with recycling inside recycling hook through laser weldingGroup is integral.
The diamond shape filter screen and connecting tube of internal layer filter screen are formed by Nitinol pipe through laser engraving.
Outer layer supporting network and internal layer filter screen are integral through laser welding group.
Outer layer supporting network contains 6 outer layer supporting rods, and 6 outer layer supporting rods link up with phase in 360 degree etc. points of arrangements with recyclingEven, outer layer supporting rod and the recycling hook S-type bending of linkage section, bending rear end are one 3mm~20mm straight-bars, bending section and straight-barIt is in 15 degree~60 degree angle hangnails that junction, which has 1,.
Each outer layer supporting rod contains a hangnail, and hangnail is consistent with outer layer supporting rod, in 360 degree etc. points of arrangements.
Internal layer filter screen divides arranged adjacent, diamond shape filter screen one and company by 6 360 degree of same size diamond shape filter screens etc.Take over connected, other end is in freely separating shape.
After this product expansion, the outer diameter of internal layer filter screen is less than the circumference outer diameter that outer layer supporting rod is formed, internal layer filter screenThe empty shape of a circle is formed between outer layer supporting rod, can prevent the contact of internal layer filter screen and venous blood tube wall, and then anti-hemostasisTube wall endometrial hyperplasia tissue, which is climbed, covers internal layer filter screen.
The effective benefit of the present invention is only 25~30mm after product expansion, can greatly reduce product and venous blood tube wallContact area, to reduce the region area of venous blood vessel wall damage.Furthermore product length is ultrashort, vein blood vessel after implantationThe probability contacted with product head end recycling hook when wall is shunk becomes smaller, to reduce recycling hook by vascular wall endometrial hyperplasia tissueCovering, causing cannot the recovered probability for linking up with recycling product.
Description of the drawings
Fig. 1 is this example overall structure diagram.
Fig. 2 is this example outer layer supporting network structural schematic diagram.
Fig. 3 is this example internal layer filter screen structure schematic diagram.
Specific implementation mode
Below according to attached drawing is illustrated, the invention will be further described：
The present invention is made of the portions A outer layer supporting network and the portions B internal layer filter screen as described in Figure 1, and AB two forms one through laser weldingBody.
Outer layer supporting network as described in Figure 2 is made of recycling hook 1, release attaching nut 2, hangnail 3, outer layer supporting rod 4；It returnsHook 1, hangnail 3, outer layer supporting rod 4 is received to be formed through laser engraving by Nitinol pipe.
Release attaching nut 2 is process by nickel-titanium alloy material, is hung with recycling in 1 inside of recycling hook through laser welding1 group of hook is integral.
Outer layer supporting network contains 6 outer layer supporting rods, 4,6 outer layer supporting rods in 360 degree etc. points of arrangements and recycling hook 1It is connected.Outer layer supporting rod 4 with recycling hook the S-type bending of 1 linkage section, bending rear end be one 3mm~20mm straight-bars, bending section andIt is in 15 degree~60 degree angle hangnails 3 that straight-bar junction, which has 1,.
Each outer layer supporting rod 4 contains a hangnail 3, and hangnail 3 is consistent with outer layer supporting rod 4, in 360 degree etc. points of arrangements.
Internal layer filter screen as described in Figure 3 is made of connecting tube 5 and diamond shape filter screen 6.
The connecting tube 5 and diamond shape filter screen 6 of internal layer filter screen are formed by Nitinol pipe through laser engraving.
Internal layer filter screen divides arranged adjacent, diamond shape filter screen 6 one by 6 same size diamond shape filter screens 6 with 360 degree etc.It is connected with connecting tube 5, other end is in freely to separate shape.
After this product expansion, the outer diameter in the portions internal layer filter screen B is less than the circumference outer diameter that the portions A outer layer supporting rod is formed, the twoBetween form an empty shape of circle, the contact of internal layer filter screen and venous blood tube wall can be prevented, and then prevent vascular wall endometrial hyperplasiaTissue, which is climbed, covers internal layer filter screen.
The above, representative instance only of the present invention, be not used in limitation the present invention, it is all on the basis of the present invention improve andThe example of extension is within protection scope of the present invention.