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Netty circular tube type intravascular stent

An internal stent and round tube technology, applied in the field of intravascular stents and medical devices, can solve problems such as rod fracture, stent structure expansion instability, lack of stent support mechanical performance analysis, etc., to achieve weak stress damage, hemodynamic The effect of good mechanical condition and excellent axial compliance

Inactive Publication Date: 2011-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stent structure disclosed in U.S. Patent US 20060003201 A1 is formed by wave-shaped rods and short N-connecting rods, the wave-shaped rods are closed, and the N-connecting rods provide open flexibility, but this technology Lack of analysis on the supporting mechanical properties of the stent during the expansion process, mechanical problems such as stent structure expansion instability and rod fracture often occur when the stent is implanted in the human body

Method used

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  • Netty circular tube type intravascular stent
  • Netty circular tube type intravascular stent
  • Netty circular tube type intravascular stent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A net-shaped circular tube-type intravascular stent is laser-engraved from AZ31 magnesium alloy thin-walled circular tubes. The magnesium alloy material in the gaps of the stent pattern structure grid is removed by laser cutting. The radial direction of the circular tube needs to be cut and removed. The vertical direction of the laser beam is 56.3°, and finally forms a net-like circular tube structure. figure 1 It is a schematic diagram of the planar expansion of the mesh circular tube stent, such as figure 1 As shown, the intravascular stent is composed of four circumferential rings 1 distributed along the axial direction, and every two adjacent circumferential rings 1 are connected by a plurality of M-shaped connecting rods 8 . Each circumferential ring 1 includes two mirror-symmetric grid unit groups 2, the grid unit groups in the ring are connected by a plurality of short straight rods 3, and the grid unit group 2 is composed of 8 grid units 4 that are uniform in ...

Embodiment 2

[0032] see figure 2 , a mesh-shaped round-tube intravascular stent is laser-engraved from an AZ91 magnesium alloy thin-walled round tube. The magnesium alloy material in the grid gap of the stent pattern structure is removed by laser cutting. The radial direction of the circumference of the round tube needs to be cut and removed. It is 26.6° to the vertical direction of the laser beam, and finally forms a net-like circular tube structure. It consists of six circumferential rings 1 distributed along the axial direction, and every two adjacent circumferential rings 1 are connected by S connecting rods 8 . Each circumferential ring 1 includes two mirror-symmetric grid unit groups 2 , and the connections between the grid unit groups in the ring are all short straight rods 3 . The grid unit group 2 is composed of 12 grid units 4 arranged evenly in the circumferential direction, and the number of grid units 4 is determined according to the clinical use requirements of the stent. ...

Embodiment 3

[0037] A mesh-like circular tube-type intravascular stent of this embodiment is laser-engraved from an AM60 magnesium alloy thin-walled circular tube. The magnesium alloy material in the grid gap of the stent pattern structure is removed by laser cutting. The circumference of the part of the circular tube that needs to be cut off The radial direction is 45° to the vertical direction of the laser beam, and finally forms a networked circular tube structure. It consists of three circumferential rings 1 distributed in the axial direction, and every two adjacent circumferential rings 1 are connected by S connecting rods 8 . Each circumferential ring 1 includes two mirror-symmetric grid unit groups 2 , and the connections between the grid unit groups in the ring are all short straight rods 3 . The grid unit group 2 is composed of 10 grid units 4 arranged evenly in the circumferential direction, and the number of grid units 4 is determined according to the clinical use requirements o...

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Abstract

The invention discloses a netty circular tube type intravascular stent comprising three to six circumambient rings distributed axially, wherein two adjacent circumambient rings are connected by a plurality of connecting rods; each circumambient ring comprises two grid unit groups of mirror symmetry; the grid unit groups in the rings are connected by a plurality of short straight rods; the grid unit groups are formed by uniformly distributing and arranging eight to twelve grid units in the circumambiency; each grid unit is formed by the circumambient sides of connecting open girders and closedgirders in series; each serial connecting port is a semicircular arc; the connecting rods are connected with the top ends of the semicircular arcs of the closed girders in the adjacent circumambient rings and the short straight rods are connected with the top end of each semicircular arc of two different grid unit groups in the same circumambient ring. The stent has the advantages of good mechanical extension property, supporting property and axial flexibility and the like and reduces the reangiostenosis rate. After the stent is expanded, the wall surface of a blood vessel is supported and the stent can avoid damaging the wall of the blood vessel due to overlarge contact stress.

Description

technical field [0001] The invention relates to a medical device, in particular to an intravascular stent suitable for human blood vessel interventional treatment, expansion and support of narrow blood vessels, and belongs to the technical field of medical device manufacturing. Background technique [0002] According to the "Global Burden of Disease 2004" released by the World Health Organization, cardiovascular disease is the main cause of death in the world. In 2004, about 7.2 million patients died of ischemic heart disease worldwide, accounting for 12.2% of the total mortality rate. It ranks first among the 20 common mortality diseases. In the "2008 China Health Statistical Yearbook", the Ministry of Health of China analyzed the main disease mortality rate of Chinese urban residents in 2007 and showed that the mortality rate of heart disease was 16.29%, ranking third only after malignant tumors and cerebrovascular diseases. Cardiovascular disease mortality and disability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/90
Inventor 劳永华黄岳山支晓兴
Owner SOUTH CHINA UNIV OF TECH
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