Patent ID: 7220241

Claim:
A coupling mechanism for connecting a medical infusion line to a catheter, the mechanism comprising a catheter hub arranged on the catheter and a coupling piece arranged at an end of the medical infusion line for connecting with the catheter hub, wherein one of the catheter hub and the coupling piece has one of a pair of coupling elements which act together in pairs: 1. a pin axially aligned in an insertion direction of the coupling piece or a sleeve configured for receiving the pin; and 2. a wedge-shaped locking wedge aligned parallel with an axial extension of the pin or a wedge receptacle for a form-fitting connection of the locking wedge, wherein the wedge receptacle is delimited by hinged positive locking elements which are configured to be moved apart from each other for releasing the form-fitting connection between the locking wedge and the wedge receptacle, and wherein lever arms are arranged at a distance from each other on the catheter hub or the coupling piece on which the locking wedge is arranged, which interact with the positive locking elements when the coupling mechanism is coupled such that the positive locking elements are spread and the locking wedge is consequently released when the lever arms are actuated.