An ultrasound imaging probe suitable for concentric on-axis biopsy procedures. The probe according to the present invention includes an aperture through which a biopsy needle is inserted to sample a target tissue previously located by the ultrasound probe. In operation, the ultrasonic probe is first...http://www.google.com.au/patents/US4671292?utm_source=gb-gplus-sharePatent US4671292 - Concentric biopsy probe
