A sheath for receiving an ultrasonic probe and for defining the relative position of the probe with respect to a biopsy gun or a rigid needle is used for precise placement of the biopsy gun or needle tip in a structure. The sheath may comprise a keyhole-shaped slot for placement of a rigid needle through...http://www.google.es/patents/US6102867?utm_source=gb-gplus-sharePatente US6102867 - Sheath and methods of ultrasonic guidance of biopsy and catheter insertion
Sheath and methods of ultrasonic guidance of biopsy and catheter insertion
