| http://www.w3.org/ns/prov#value | - Such apparatus permits safe and accurate placement of a surgical instrument, such as a cannula, into a portion of the central nervous system, e.g. the brain and spinal cord, of a patient by simple mechanical...http://www.google.fr/patents/US5643286?utm_source=gb-gplus-shareBrevet US5643286 - Method of inserting a surgical instrument into the central nervous system Recherche avanc???e dans les brev
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