Marker delivery system with obturator
A marker delivery device is described which has an obturator with an elongated shaft, an inner lumen, a proximal end, and a substantially sealed distal end. One or more tissue markers are deployed within the inner lumen of the elongated shaft of the obturator. Preferably, the tissue marker(s) is disposed within an inner lumen of a marker delivery tube which is disposed within the inner lumen of the elongated shaft of the obturator. The marker delivery tube has an opening for discharging the tissue markers into a body (e.g. biopsy) cavity. The distal tip of the marker delivery tube is configured to penetrate the substantially sealed distal end of the obturator so that tissue markers can be delivered while the obturator is in place within the body. Preferably, the obturator includes a detectable element capable of producing a relatively significant image signature during MRI.
1. An obturator, comprising:
a. an elongated shaft comprising a cylindrical wall having a proximal end, a distal end and defining an internal lumen extending to the distal end and an obturator tip secured to the distal end; and
b. a detectable element which is in contact with the mating surfaces of the terminal distal end of the cylindrical wall and the obturator tip, said detectable element comprising a material selected from the group consisting of metal, ceramic, metal-filled plastic, a radiopaque material, or a mineral-filled plastic and being configured to produce a significant magnetic resonance image signature.
2. The obturator of claim 1 wherein the distal end of the cylindrical wall has at least one aperture and the obturator tip has at least one raised tab configured to fit within said at least one aperture.
3. The obturator of claim 1 wherein the detectable element is a ring which is disposed at the junction between the obturator tip and the distal end of the cylindrical wall of the elongated shaft of the obturator.