A delivery cannula for a site marker deployment device is disclosed. The delivery cannula includes a cannula having a tubular sidewall and at least one slot intersecting through the side wall. Each slot is sized to have a predetermined width so as to be configured to receive at least one filament of a site marker. When the site marker is inserted into the delivery cannula, at least a portion of the filament extends outwardly from the cannula and through the slot. A deployment system is also disclosed.
