Suprapubic safety cannula

A suprapubic cannula for puncturing body cavities comprising

• outer and inner longitudinally cut sleeves each sleeve having a proximal end, a distal end, and a handle portion at the proximal end, each handle portion including flange,
• wherein the inner sleeve is arranged within the outer sleeve to be longitudinally displaceable and rotatable within the outer sleeve such that the longitudinal cut of the inner sleeve is covered in a first rotational position by the outer sleeve and the longitudinal cuts of the inner sleeve and the outer sleeve are placed on top of each other in a second rotational position,
• wherein the inner sleeve is provided at its distal end with a puncture tip, the inner sleeve having an extended position corresponding to the first rotational position, in which the puncture tip extends outside the distal end of the outer sleeve, and a retracted position corresponding to the second rotational position, in which the puncture tip is completely retracted into the outer sleeve;
• and
• wherein the handle portions interlock through a threaded engagement at a location that is between the flanges, the threaded engagement drives movement of the inner sleeve between the extended and first rotational position and the retracted and second rotational position in response to rotation of the handle portion relative to each other.