Indwelling cannula needles are specifically designed for single-use. They come direct from the manufacturer, pre-sterilized and individually packaged. Single time use ensures needle sharpness and makes for a more painless procedure. Other piercing methods often involve cheaper quality, re-worked hypodermic needles which have microscopic barbs and are more prone to dulling. Use of a piercing gun has similar problems as the jewelry used is not sharp, thus causing greater tissue trauma.
Indwelling cannula needles are extremely sharp and glide through the tissue. When the needle is removed, the cannula (a flexible plastic sheath) is left behind. It conforms to the body and holds the piercing open for easier jewelry insertion. As the jewelry is inserted, the cannula is removed simultaneously.
This method of piercing leaves a very neat incision which results in faster, more comfortable healing times.