Endolumenal device (1) for delivering and positioning an endolumenal expandable prosthesis (6) for a bifurcation between a principal conduit and at least one secondary conduit, comprising an elongated body (2) having a proximal end portion (4) and a distal end portion (3). The distal end portion (3) of the elongated body (2) comprises expansion means (5). Guidewire tracking means (11) extend at least partially along said elongated body (2) and comprise at least one pair of guidewire lumens (12, 13). At least one of said guidewire lumens (12, 13) extends at least partially remaining attached to the wall of said expansion means (5).
