A delivery device (10, 110) configured to introduce a net tissue marker, comprising: a handle (14) having a chamber (26) a cannula (16) configured to hold the tissue marker for implantation thereof, the cannula (16) having a substantially rigid side wall (16-3) surrounding a lumen (16-4) extending along a longitudinal length of the cannula (16), the cannula (16) a distal end and a proximal end an introducer rod (18) movably disposed in the marker lumen of the cannula (16) implementation mechanism (20) mounted on the handle (14) and configured to move the rod introducer (18) of the marker to implant the tissue marker when a performance implementation mechanism (20) occurs, and a retraction mechanism (22) mounted on the handle (14) and configured to facilitate a complete retraction of the cannula (16) and the introducer rod (18) of the marker in the chamber (26) of the handle when a mechanism operating occurs retraction (22). characterized in that the cannula (16) has a flexible portion (30) formed by a slot arrangement having a plurality of peripheral grooves (34) extending through the sidewall of the cannula lumen, being separated the plurality of peripheral grooves (34) to be substantially parallel along the longitudinal length of the cannula (16) to facilitate bending the flexible portion (30) of the cannula being positioned the flexible portion (30) of the cannula near the distal end of the cannula (16), and that the introducer rod (18) of the marker has a flexible region (50) corresponding to the flexible portion of the cannula.Un dispositivo de administración (10, 110) de marcador configurado para implantar un marcador de tejido, que comprende: un mango (14) que tiene una cámara (26) una cánula (16) configurada para sujetar el marcador de tejido para la implantación del mismo, teniendo la cánula (16) una pared lateral sustancialmente rígida (16 - 3) que rodea un lumen (16 - 4) que se extiende a lo largo de una extensión longitudinal de la cánula (16) , teniendo
