A connector for medical infusion/transfusion lines, catheters and the like, comprising a tubular body with a protection valve including an obturator formed by a resilient disk having a circumferential sealing edge normally co-operating under closing contact with an annular valve seat having a ...http://www.google.com/patents/US5749861?utm_source=gb-gplus-sharePatent US5749861 - Connector with protection valve for medical infusion/transfusion lines and the like 
