A tissue-penetrating catheter device for use within the body consists of: an outer catheter assembly including an outer catheter having distal and proximal ends, and a terminal member joined to the proximal end; an inner catheter assembly including an inner catheter extending within the outer catheter...http://www.google.de/patents/US4763667?utm_source=gb-gplus-sharePatent US4763667 - Tissue-penetrating catheter device
