CN100348281C - Large-radical-support-force medical stent - Google Patents

Abstract

The present invention relates to a medical support frame with large radical support force, which is formed by etching by metal tubes and is in a tubular net-shaped structure. The support frame is composed of a plurality of axially-distributed basic structures (1) in the shape of sine waves and circular rings, wherein wave crests of sine waves are opposite to each other between every two adjacent basic structures (1) in the shape of sine waves and are connected with each other by X-shaped connecting members (2); connecting points (3) are arranged among the wave crests and the wave troughs of the basic structures (1) in the shape of sine waves and circular rings, and the rib width (5) of the X-shaped connecting members (2) is smaller than or equal to the rib width (4) of the basic structures (1) in the shape of sine waves and circular rings. The end of the support frame in cavity channels can be manufactured into a horn mouth shape, the inner surface and the outer surface of the support frame can be covered with metal films, oxide films, polymer films or slow-release medicine films, and the materials for etching the metal tubes of the support frame in the cavity channels can be nickel-titanium alloy, stainless steel, titanium alloy, pure metal tantalum or gold, etc. The present invention has the advantages of large radical support force, stable structure, etc.

Description

Large radial support force medical stent

technical field

The invention relates to a medical stent with a large radial support force, which is used for expanding and supporting narrow blood vessels, esophagus, bile duct, intestinal tract or urethra, etc., and belongs to the technical field of medical equipment manufacturing.

Background technique

Vascular embolism, esophageal cancer, benign prostatic hyperplasia, and biliary tract stones are common luminal obstructive diseases in daily life. Open surgery can be used for clinical treatment. Not only is the operation difficult, but there are also some difficult problems to solve, such as many complications, The high risk and high recurrence rate require a more convenient, safe and effective method to solve the above difficulties, and the use of internal stent intervention is an effective method. Intraluminal stents are a commonly used device and come in various shapes, with tubular being the most common. Most of the existing internal stents for human cavity are grid-like or spiral filament-like structures, which are used to expand and support narrow blood vessels, esophagus, biliary tract, intestinal tract, urinary catheter and other human body lumens after being implanted in the human body. It relieves cavity obstruction, keeps the cavity unobstructed, is easy to operate, reliable in curative effect, and has few complications. However, there are still some defects in the existing stents. For example, the commonly used non-vascular intraluminal stents are mostly braided with silk, which is in the shape of a tubular grid. Such stents have overlapping points of metal materials, which makes the fluidity of body fluids worse. Moreover, the radial support force of the bracket is insufficient, and the adjustable range is small. Commonly used vascular stents also have disadvantages such as small radial support force of the stent and poor structural stability. Therefore, there are further requirements for the design and manufacture of medical stents with large radial support force that meet the surgical requirements.

Contents of the invention

Technical problem: The purpose of the invention is to change the deficiency of the large radial support force medical stent currently used, and provide a large radial support force with a large radial support force, good structural stability, etc., with a tubular mesh structure. Support force medical bracket.

Technical solution: The medical stent with large radial support force of the present invention is etched from a metal tube and has a tubular mesh structure. Between two adjacent sine wave circular basic structures, the crests of the sine waves face each other and are connected by an "X" shaped connector, and the connection point is selected between the crests and troughs of the sine wave circular basic structures.

The above-mentioned medical stent with large radial support force is characterized in that between every two adjacent sinusoidal circular ring-shaped basic structures, the "X"-shaped connectors are distributed at equal intervals, and the distance is the sine of the sinusoidal circular circular basic structure. An integer multiple of the wavelength of a wave, the integer is 1 or 2 or 3, etc. The rib width of the "X"-shaped connector should be less than or equal to the rib width of the sinusoidal circular ring-shaped basic structure.

When the present invention is used for expansion and support of vascular stenosis, the outer diameter is 1-20mm, the total length is 5-150mm, the wall thickness is 0.02-0.4mm, and the number of sine wave cycles of the sinusoidal ring-shaped basic structure There are 6-36 pieces, the overall width is 0.5-10mm, and the rib width is 0.06-0.6mm.

When the present invention is used for the expansion and support of non-vascular stenosis parts in the human body, its outer diameter is 6-25 mm, its total length is 50-140 mm, its wall thickness is 0.1-0.5 mm, and it has a sinusoidal circular ring-shaped basic structure. The number of sine wave periods is 6-30, the overall width is 1.0-10mm, and the rib width is 0.15-0.7mm.

The end of the present invention can be made into a trumpet shape. Its inner and outer surfaces can be covered with metal film, oxide film, polymer film or slow-release medicine film. The metal tube of the present invention can be etched with materials such as nickel-titanium alloy, stainless steel, titanium alloy and pure metal tantalum or gold, etc., wherein, the present invention that adopts nickel-titanium alloy tube etching is a self-expanding stent, and adopts stainless steel tube, titanium alloy The present invention etched by tube, tantalum metal tube or gold metal tube is a balloon-expandable stent.

The present invention has a sinusoidal circular ring-shaped basic structure, which is connected by an "X"-shaped connector, and there are four symmetrically distributed connection points between each "X"-shaped connector and the surrounding sinusoidal circular ring-shaped basic structure. This makes the bracket have good structural stability and large radial support force during surgical installation and use, and the bracket has a smooth surface, continuous structure, easy polishing, and no overlapping points of metal materials.

Description of drawings

Fig. 1 is a schematic diagram of the deployment of the stent according to Example 1 of the present invention.

Fig. 2 is a schematic diagram of the deployment of the stent of Example 2 of the present invention.

Fig. 3 is a schematic radial cross-sectional view of the present invention.

The reference signs therein are: 1—sinusoidal circular ring-shaped basic structure, 2—“X”-shaped connector, 3—joint point, 4—sinusoidal circular ring-shaped basic structure 1 rib width, 5—“X” The rib width of the shaped connector 2, 6—the wavelength of the sine wave, 7—the amplitude of the sine wave, 8—the overall width, 9—the distance between two adjacent sinusoidal wave ring-shaped basic structures 1, 10—adjacent The distance between the "X"-shaped connectors 2, 11—the outer diameter of the bracket, 12—the wall thickness of the bracket, and 13—the total length of the bracket.

Detailed ways

Below, the present invention will be further described in conjunction with the accompanying drawings and embodiments.

Example 1

Referring to Figure 1, a tubular stent for blood vessels in the human body is etched from a superelastic nickel-titanium alloy tube and has a tubular network structure. 1, between each two adjacent sinusoidal circular ring-shaped basic structures 1, the crests of the sine waves face each other, and are connected by an "X"-shaped connector 2, and the connection point 3 is selected at the sinusoidal circular ring-shaped basic structure 1 The middle position between the peak and the trough. Between every two adjacent sinusoidal ring-shaped basic structures 1 , the "X"-shaped connectors 2 are distributed at equal intervals, and the distance 10 is one time of the sine wave wavelength 6 of the sinusoidal ring-shaped basic structures 1 . The rib width 5 of the "X"-shaped connector 2 is smaller than the rib width 4 of the sinusoidal circular ring-shaped basic structure 1 .

The outer diameter 11 of the stent in this embodiment is 2.38 mm, the total length 13 is 19.715 mm, the wall thickness 12 is 0.1 mm, and the expanded width is 7.459 mm. The overall width 8 is 1.735mm, the rib width 4 is 0.12mm, the amplitude 7 of the sine wave of the sinusoidal circular ring-shaped basic structure 1 is 0.868mm, and its wavelength 6 is 1.243mm. The spacing 9 between the structures 1 is 2 mm, the rib width 5 of the "X"-shaped connector 2 is 0.1 mm, and the spacing 10 between two adjacent "X"-shaped connectors 2 is 1.243 mm.

This embodiment is a self-expanding tubular stent for blood vessels. During the operation, the invention is constrained in the catheter. After being implanted into the narrowed part of the blood vessel in the human body, the restraining catheter is removed. The invention will self-expand due to its good superelasticity. To expand and support the stenotic blood vessels, to achieve the purpose of treatment.

The end of the bracket in the cavity can also be made into a trumpet shape. The inner and outer surfaces of the stent in the cavity can also be covered with metal film, oxide film, polymer film or slow-release drug film. The material of the metal tube for etching the stent in the lumen can also be stainless steel, or titanium alloy, or pure metal tantalum or gold.

Example 2

Referring to Figure 2, the tubular stent for blood vessels in the human body is etched from a superelastic nickel-titanium alloy tube and has a tubular network structure. The structure 1 is composed of two adjacent sinusoidal circular ring-shaped basic structures 1. The crests of the sine waves are opposite and connected by "X"-shaped connectors 2. The connection point 3 is selected in the sinusoidal circular ring-shaped basic structure. 1 in the middle of the peak and trough. Between every two adjacent sinusoidal circular ring-shaped basic structures 1, the "X"-shaped connectors 2 are distributed at equal intervals. 3 times. The rib width 5 of the "X"-shaped connector 2 is smaller than the rib width 4 of the sinusoidal circular ring-shaped basic structure 1 . Other structures, dimensions, and manufacturing methods of this embodiment are the same as those of Embodiment 1.

Claims (9)

1. A medical stent with a large radial support force, which is etched from a metal tube and has a tubular network structure, is characterized in that the stent consists of a plurality of sinusoidal circular ring-shaped basic structures distributed along its axial direction (1) Composition, every two adjacent sinusoidal waveform circular basic structures (1) are connected by an "X"-shaped connector (2); the sine of each adjacent two sinusoidal circular circular basic structures (1) The wave crests are opposite; the connection point (3) between the sinusoidal circular ring-shaped basic structure (1) and the "X"-shaped connector (2) is selected between the crest and the trough of the sinusoidal circular circular basic structure (1) . 2. The medical stent with large radial supporting force according to claim 1, characterized in that the connection point (3) between the sinusoidal circular ring-shaped basic structure (1) and the "X"-shaped connector (2) is selected at The intermediate position between the crest and the trough of the circular basic structure (1) of sinusoidal waveform. 3. The medical stent with large radial supporting force according to claim 1, characterized in that between every two adjacent sinusoidal circular ring-shaped basic structures (1), the "X" shaped connectors (2) are equidistant distribution, the spacing (10) is an integer multiple of the sine wave wavelength (6) of the sine wave circular ring-shaped basic structure (1). 4. The medical stent with large radial supporting force according to claim 1, characterized in that the rib width (5) of the "X"-shaped connector (2) is less than or equal to the rib of the sinusoidal circular ring-shaped basic structure (1) width (4). 5. The medical stent with large radial support force according to claim 1, characterized in that when the stent is used for expansion and support of vascular stenosis, its outer diameter (11) is 1-20 mm, and its total length (13) is 5-150mm, the wall thickness (12) is 0.02-0.4mm, the number of sine wave cycles of the sinusoidal circular ring-shaped basic structure (1) is 6-36, and its overall width (8) is 0.5-10mm. The width (4) is 0.06-0.6mm. 6. The medical stent with large radial supporting force according to claim 1, characterized in that when the stent is used for expansion and support of non-vascular lumen stenosis in the human body, its outer diameter (11) is 6-25mm, The total length (13) is 50-140 mm, the wall thickness (12) is 0.1-0.5 mm, the number of sine wave cycles of the sinusoidal circular ring-shaped basic structure (1) is 6-30, and its overall width [8] is 1.0 ~10mm, the rib width (4) is 0.15~0.7mm. 7. The medical stent with large radial supporting force according to claim 1, characterized in that the end of the stent is bell-shaped. 8. The medical stent with large radial supporting force according to claim 1, characterized in that the inner and outer surfaces of the stent are covered with metal film, oxide film, polymer film or slow-release drug film. 9. The medical stent with large radial supporting force according to claim 1, wherein the material of the metal tube for etching the stent is stainless steel, or titanium alloy, or pure metal tantalum or gold.

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