Cannulation device

A cannulation device for providing an access to a patient through a skin of the patient, comprising a puncture needle with a needle tip for puncturing the skin of the patient and a cannula, the puncture needle being secured to a needle holder and the cannula being secured to a cannula holder so that the needle and the cannula extend along a longitudinal axis of the cannulation device, with the needle holder being movably mounted with respect to the cannula holder so that puncture needle is movable between a puncture position, in which the needle tip protrudes out of the cannula, and a safety position, in which the needle tip is arranged inside the cannula, the needle holder comprising a first connecting element and the cannula holder comprising spaced-apart second and third connecting elements arranged at a distance to each other along an axis that extends substantially parallel to the longitudinal axis, the first connecting element comprising a protrusion and each of the second and third connecting elements comprising a window sized to receive the protrusion, wherein the first connecting element of the needle holder and the second connecting element of the cannula holder are adapted to cooperate with each other such as to secure the needle holder with respect to the cannula holder, with the puncture needle in the safety position, and the first connecting element of the needle holder and the third connecting element of the cannula holder are adapted to cooperate with each other to secure the needle holder with respect to the cannula holder with the puncture needle in the puncture position.