Patent ID: 6471719
Filing Date: 2002-10-29
Classification: A61F,Y10S

Abstract:
A double-sheet stent for insertion in a lumen of a vessel of living being, comprising:constructive elements, preliminary formed in a shape of the two mainly similar stencils I and II on the surfaces of the two thin sheet metallic blanks, each of which is represented by the two relatively rigid bands, the branches of which form a periodically repeating winding outlines of a preconditioned width and which in a stent expanded shape take the form of semicircles, located one after the other oppositively in relation to the said relatively rigid bands in a consecutive alternation along the stent longitudinal axis, whereas the distance between the neighboring branches is greater than the winding outlines width; the constructive elements stencils I and II are preliminary superimposed one on another so as to be shifted for a winding outline width along the stent longitudinal axis and form the alternating winding outlines pairs, whereas one pair of the said winding outlines is executed by the simple superimposing of stencil I winding outline on stencil II winding outline, while the neighboring pair of the said winding outlines is executed by the superimposing of stencil II winding outline on the winding outline of stencil I, for which purpose the winding outlines of stencil II are passed through the slots between winding outlines of stencil I, and in the stent expanded shape the formed semicircles are located by turns, one semicircle belongs to stencil I, while the neighboring semicircle belongs to stencil II, and this sequence of the said semicircles location along the stent longitudinal axis is preserved both from the one side, as well as from the opposite side of the said doubled relatively rigid bands; the constructive elements stencils I and II are preliminary superimposed one on another so as to shift for a said width of the winding outlines along the stent longitudinal axis and to form the winding outlines alternating parts, whereas each of the winding outlines of stencil I is passed through the slots between the winding outlines of stencil II against the stop of the said winding outlines branches of stencil I into the branches of the winding outlines of stencil II, while in the stent expanded shape all the formed semicircles of stencil II are located on one side over the the relatively rigid band of stencil I, and all formed semicircles of stencil I are located oppositively on the other side over the relatively rigid band of stencil II; the constructive elements stencil I and II, definitely oriented along winding outlines and are spread one in relation to another for 180Â°, then stencil I is superimposed on stencil II, then pass the said stencil I winding outlines into the slots between the stencil II winding outlines against the stop of the winding outlines branches of stencil I into the branches of the winding outlines of stencil II, while in the stent expanded shape all formed semicircles of stencil II are located on one side over the relatively rigid band of stencil I, and all formed semicircles of stencil I are located appositively on the other side over the relatively rigid band of stencil II; for the SVG segments with a diameter of about 5 mm the distance between the said semicircles along the stent longitudinal axis is adjusted within the limits of the said values difference, the distance between the neighboring semicircles and preconditioned winding outlines width, while for the arteries with a diameter of about 3 to 4 mm, that require a greater distance between the semicircles, the distance between the neighboring semicircles is increased; for the relatively large vessels in the said stencil I and II the constructive elements, the winding outlines of the stent future semicircles, are executed as rectilinear ones.