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61results about How to "Minimize amount of material" patented technology

Expandable endovascular stent

InactiveUS20050080479A1Minimize amount of materialSubstantial longitudinal flexibility longitudinalStentsBlood vesselsStress concentrationPercent Diameter Stenosis
Disclosed herein is a tubular endovascular stent comprising a plurality of annular segments connected by one or more bridging elements. Each annular segment takes forms of periodic wavelets with a plurality of alternating symmetric peaks and valleys, preferably consisting of circular arc segments of large radii connected tangentially with straight segments to minimize stress concentration when the stent undergoes radial deformation, transverse to the longitudinal axis of the stent. The points of connection between the bridging elements and adjacent annular segments are so designed that deformations of the bridging elements remain negligible as the stent deforms radially, namely, the longitudinal dimension of the stent does not vary during the radial expansion or contraction of the stent. Hence, the radial strength and the longitudinal flexibility of the stent made according to the principles disclosed by the present invention can be independently controlled by the design parameters for the annular segments and bridging elements, without compromising the longitudinal dimensional stability of the stent. Since stress concentration and deformation in the stent can lead to restenosis, stent made from the invention disclosed here can reduce the probability of restenosis.
Owner:FENG JAMES Q +1

Method of manufacturing a pipe coupling component, method of manufacutring a casing structural member, and pipe coupling sturcture for a hollow part

In a first step of this method, a first intermediate product 42 having a coupling portion forming portion 16d and flat portions 21 is produced. In a second step, there is produced a second intermediate product 44 which is larger in the bending depth of the coupling portion forming portion 16d and is smaller in width of the flat portions 21 than the first intermediate product 42. In a third step, a third intermediate product 36 having the coupling portion forming portion 16d, sloping flat portions 34, and narrow flat portions 35 is produced. In a fourth step, the sloping flat portions 34 of the third intermediate product 36 are pressed obliquely upward so as to cause the material to move to the boundaries between the sloping flat portions 35 and the side walls of the coupling portion forming portion 16d, to thereby produce a fourth intermediate product 37. In a fifth step, the side walls of the coupling portion forming portion 16d, the sloping flat portions 34 and the narrow flat portions 35 of the fourth intermediate product 37 are pressed from the upper and lower sides, to thereby form a fifth intermediate product 39 in which burrs 38 are formed at the opening-side end portions of the side walls of the coupling portion forming portion 16d. In a sixth step, the burrs 38 are removed, whereby a casing structural member 16 produced. This method enables manufacture of casing structural members which can prevent leakage of fluid.
Owner:SHOWA DENKO KK
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