An infusion apparatus including an indwelling venous cannula with a catheter holder, a plastic catheter and a steel cannula holder with a steel cannula extending through the plastic catheter and the catheter holder, a tubular valve body made of elastomeric plastic with certain length L being disposed...http://www.google.es/patents/US6638250?utm_source=gb-gplus-sharePatente US6638250 - Indwelling venous cannula
