Flexible self-expandable stent device and method for making the same

Abstract

Disclosed is a zig-zag type stent sheathed by an elastic rubber member including at least two zig-zag units (1) spaced at fixed intervals, and a cover member (3) which sheaths the zig-zag units and acts as connecting means such that the stent does not require separate connecting means between the zig-zag units and the stent is cylindrically formed. Further, spacing between the zig-zag units is determined using the following formula: where, I is the interval between the zig-zag units which can be increased or decreased by 50%, d is a diameter of the stent, &thetas; is a curvature angle of the stent, and eta is the number of units.

Description

technical field [0001] The present invention relates to a stent, and more particularly to a bendable self-deploying stent and a method of manufacturing the same, the stent can provide improved bending properties so that when placed in a curved lumen When inside, it can be flexibly adapted to the curvature of the lumen to prevent backflow of food or liquid. Background technique [0002] In general, a stent is a medical device used to widen the lumen or blood vessel of an internal organ that has been narrowed by, for example, disease, injury, or surgery. This type of stent is generally cylindrical in shape, and can be broadly divided into the following two categories: 1) One type is a stent with a predetermined amount of elasticity, that is, it can shrink when an external force is applied, and can shrink when the external force is removed. Self-expanding; 2) Another category is stents made of plastic, that is, they remain deployed after being deployed from a contracted state....

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned stents have the disadvantage of obstructing the passage when used in curved lumens

That is, because the zigzag unit 101 is connected with the line connector 102 without leaving any gap between them, and the zigzag unit 101 and the connector 102 are covered with the cover 103, so when the said spreader is installed on When inside a curved lumen, it does not gradually bend in response to the curvature of the lumen, but folds or creases as shown in the figure, whereby the passage of the stent as well as the lumen are blocked

[0008] Furthermore, all prior art stents have the disadvantage of having no means to prevent backflow of food or liquids

Although humans have natural mechanisms to inhibit the reflux of food or liquid in areas such as the stomach and esophagus, when using prior art stents in this position, it is possible to Damage to the esophagus, which, in turn, may allow backflow of fluid into the lungs, causing lung disease

Therefore, it is not feasible to use prior art stents in areas where the flow of food and liquids in opposite directions must be avoided

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