Systems and methods for determining tissue contact and penetration depth are provided. In one aspect, the system includes a needle and a pressure measurement assembly. The needle, in one exemplary embodiment, includes a first end and a second end with at least one aperture located a predetermined distance...http://www.google.de/patents/US20050004513?utm_source=gb-gplus-sharePatent US20050004513 - Systems and methods for detecting tissue contact and needle penetration depth
