Fibrous marker and intracorporeal delivery thereof

An intracorporeal marker delivery system for delivering a plurality of tissue markers to a tissue site, comprising:

• a delivery device including an elongated delivery cannula and a plunger, the elongated delivery cannula having an inner lumen, a distal tip, and a discharge opening in communication with the inner lumen, and the plunger having a plunger shaft slidably received in the inner lumen;
• a radiographically detectable marker including a bioabsorbable fibrous marker body that carries a radiographically detectable marker element, the radiographically detectable marker disposed within the inner lumen of the delivery cannula distal to the plunger shaft;
• an MRI detectable distal tip plug configured to expand in the presence of body fluids, the MRI detectable distal tip plug disposed at least in part within a distal portion of the inner lumen distal to the radiographically detectable marker, and configured to partially occlude the discharge opening in the elongated delivery cannula;
• and
• an ultrasound detectable short term marker, the ultrasound detectable short term marker being interposed between the radiographically detectable marker and the MRI detectable distal tip plug in the inner lumen of the elongated delivery cannula.

An intracorporeal marker delivery system for delivering a plurality of tissue markers to a tissue site, comprising:

• a delivery device including an elongated delivery cannula and a plunger, the elongated delivery cannula having an inner lumen, a distal tip, and a discharge opening in communication with the inner lumen, and the plunger having a plunger shaft slidably received in the inner lumen;
• a radiographically detectable marker including a bioabsorbable fibrous marker body that carries a radiographically detectable marker element, the radiographically detectable marker disposed within the inner lumen of the delivery cannula distal to the plunger shaft;
• a distal tip plug configured to expand in the presence of body fluids, the distal tip plug disposed at least in part within a distal portion of the inner lumen distal to the radiographically detectable marker, and configured to partially occlude the discharge opening in the elongated delivery cannula;
• and
• an ultrasound detectable short term marker, the ultrasound detectable short term marker being interposed between the radiographically detectable marker and the distal tip plug in the inner lumen of the elongated delivery cannula,
• wherein at least one of the radiographically detectable marker, the ultrasound detectable short term marker, and the distal tip plug further includes an MRI contrast agent.