1. A marker delivery device comprising: a. an obturator having an elongated shaft, an internal lumen, a proximal end and a substantially sealed distal end; and b. a marker delivery tube which is configured to be slidably disposed within the internal lumen of the obturator and which has a marker delivery lumen configured to contain one or more tissue markers, a proximal end, and a distal tip configured to penetrate the substantially sealed distal end of the obturator with an opening for passage of one or more tissue markers.