A biopsy device includes a flexible distal portion for obtaining a biopsy sample. The device includes a coring cannula defining a coring relief notch adjacent its distal end having a length longer than a diameter of the cannula. A wire is slidably disposable within the lumen of the coring cannula and...http://www.google.es/patents/US7841990?utm_source=gb-gplus-sharePatente US7841990 - Flexible tip medical instrument
