The adult needle is 10 cms long ( shaft measures 8 cms ). 15 cms long needles are also available for obese patients

The markings are 1 cm apart for the adult needle and 0.5 cm for the pediatric one

For the adult 16 & 18 G are the commonly used ones, whereas for the pediatric 19 G needles are available

Tuohy is the commonly used needle

Regarding the tip: The bevel is angled at 20 degree with the shaft. It is known as Huber point. It’s blunt. All these features aid in the effectiveness of Loss of Resistance Technique

Regarding the catheter: It’s made of nylon or teflon. The distal tip is rounded and closed. So fluid can escape only through the side ports. All these features helps to reduce chances of dural puncture and vascular injury

The adult catheter is 90 cms long