Catheter introducer assembly comprising needle protection

A unit catheter introducer, comprising: a receptacle (14) needle and a hollow needle (12) attached thereto, which is provided near the tip of the needle, coupling means (50), one receptacle (18) catheter, comprising a catheter (16) attached thereto, a barrier or lining (20; 110) up to the needle tip, disposed about the needle and which is susceptible to be slid from a position ready for operation to a safety position in which the safety barrier covers the tip of the needle, and a coupling means (58, 78) located in the security barrier (20; 110) in which the coupling means (50) of the needle (12) engage with the coupling means (58, 78) arranged in the safety barrier (20; 110) when the needle is withdrawn from the receptacle (18) catheter, so that the security barrier takes the safety position on the needle tip, which Labarrera security is designed as an elastic fastener (28, 84) element, and in which arms elastic ( 43, 44) of this spring clip cover the needle tip in the safety position, characterized in that the spring clip is disposed at least in part in the ready position for operation within an enclosure wall or surround (66) of the receptacle (14) of the needle, while the opposite spring arms (43, 44; 92) of the spring clip are coupled detachably at the outer circumference of the receptacle (18) of the catheter.