First, the puncture is performed at the level of lumbar vertebrae L2/3 or L3/4 using a Tuohy cannula, followed by identification of the epidural space. The metal stylet of the Tuohy cannula provides for more stability, particularly in cases of special length. The outer cannula and the metal stylet are moreover produced and sharpened together so that the metal stylet ends flush with the cannula. This avoides with virtual certainty, that tissue fragments are introduced into the epidural space during the injection.

In the second step, a SPROTTE® spinal puncture cannula is introduced through the Tuohy cannula. This cannula is used to puncture the subarachnoidal space and to perform spinal anaesthesia by administering a local anaesthetic.

Even the smallest quantities of cerebrospinal fluid can be clearly detected by way of a viewing chamber in the hub of the cannula. The period of time between the puncture of the spinal space and the injection of the anaesthetic can therefore be reduced substantially.

A marking on the proximal cannula shaft of the SPROTTE® cannula facilitates the safe and sure puncture of the dura for spinal anaesthesia.

The SPROTTE® cannula can be locked in place completely with the new Locking system. The spinal cannula is thereby anchored in exactly the desired position in the Tuohy cannula. After that the steel stylet is retracted and the anaestetic can be administered.

Manual fixation of the SPROTTE® cannula in the Tuohy cannula using one hand.

Thanks to the new Locking system, the SPROTTE® cannula can be retracted after the puncture has been performed, without having to open the Locking system

The epidural catheter can now be introduced into the Tuohy cannula, which remains in position.