摘要：

Page 1. 3,176,690 April 6, 1965 PB H'DOUBLER Fiied May 26, 196i, Ser. No. 112,833 3 Claims.(Cl. 128-448) The present' invention provides for the modi?cation' of tubular bodies used inmedicine and particularly in sur gery to convey material through the tube.

展开