A stent Expansion formula

PURPOSE: An expandable stent is provided to uniformly expand a site to be operated and to oppose against the blood vessel contraction power. CONSTITUTION: An expandable stent comprises: a cylindrical first row curved body(20) which is formed by forming unit curved bodies(10) of a peanut shape in a longitudinal direction; a cylindrical second row curved body(30); a cylindrical third row curved body(40); a cylindrical fourth row curved body(50); and a cylindrical N-th row curved body(N). Each unit curved body connects an upper curved member to a lower curved member using a connector.