The subject invention pertains to a method and apparatus for placing a minimally-invasive access with respect to a patient's bone or other non-soft tissue. The subject invention can use a drilling machine incorporating an ultrasound motor. The subject drilling machine can be applied to sample, for example,...http://www.google.es/patents/US20080177268?utm_source=gb-gplus-sharePatente US20080177268 - Minimally-Invasive Approach to Bone-Obstructed Soft Tissue
Minimally-Invasive Approach to Bone-Obstructed Soft Tissue
