A catheter system includes a catheter having a proximal end, a distal end, and a lumen extending therein. An administering portion is disposed at the distal end of the catheter and is configured to administer a bolus of liquid in response to positive pressure in a distal portion of the lumen. The catheter...http://www.google.fr/patents/US7695455?utm_source=gb-gplus-shareBrevet US7695455 - Delivery of a low volume liquid bolus
