| 摘要 |
829,943. Artificial ducts. CHEMSTRAND CORPORATION. Jan. 6, 1956 [Jan. 17, 1955], No. 574/56. Class 81 (2). [Also in Group XXVIII] A flexible tube 2 for replacement of blood vessels is formed by a stiffened braided tube of nylon or acrylonitrile fibres provided with permanent annular crimps to prevent collapse during flexing. A braided tube is stretched on a mandrel, stiffened by immersion in formic acid and compressed on the mandrel to produce the crimps which are set by heating in an oven to 110-150� C. and released slightly by immersion in water at about 100� C. to make them more flexible. |
