A through the needle catheter device is described which includes apparatus for threading a catheter into a blood vessel. The apparatus is irreversible during the threading process. The catheter device also includes means for irreversibly withdrawing and splitting the needle. A technique is provided for...http://www.google.co.uk/patents/US4994040?utm_source=gb-gplus-sharePatent US4994040 - Through the needle catheter insertion device and technique
