A pressure actuated flow control valve for an infusion catheter permits gravity flow of a liquid through the catheter and into a patient while resisting back flow of blood from the patient and into the catheter. The valve has a hemispherical body with an outstanding circumferential flange and a normally...http://www.google.es/patents/US7959614?utm_source=gb-gplus-sharePatente US7959614 - Pressure actuated flow control valve
