Patent ID: 7285097

Claim:
A system to sense the location of a distal portion of a member within a body, the system comprising: an introducer portion including: a lumen adapted to introduce an instrument there-through, and a distal end adapted to be placed within a body, the distal end having an opening lying in a plane perpendicular to a longitudinal axis of the lumen and a proximal end having an opening lying in a plane perpendicular to the longitudinal axis of the lumen; a pressure sensor, in fluid communication via the lumen with the opening at the distal end, adapted to provide a pulsation which can be sensed by an operator when the distal end is placed within a pulsating portion of the body; and a core pin with a channel to provide said fluid communication, the core pin sized such that the core pin obstructs the opening at the distal end of the introducer so that the channel is the only flow path from the distal end of the introducer.