A puncturing system has a carrier tape carrying multiple lancets, a device housing comprising a conveying facility for moving the lancets into a usage position consecutively by moving the carrier tape in a conveying direction, a puncturing drive for accelerating one of the lancets that is positioned in the usage position in a puncturing motion, an opening in the device housing for touching against a body part in which a puncture is to be made by the puncturing motion of one of the lancets, an actuation facility for driving the conveying facility, and an unlockable interlock comprising a stop that blocks further transport of the carrier tape as soon as one of the lancets has reached the usage position.