Pen needles are used to inject medication (most commonly to inject insulin in diabetic patients). Pen needles offer various advantages over conventional needle and syringe device such as they aid in self-administration of the medication and do not require expertise. Pen needles are screwed to injection pens through plastic hub and has the required quantity of medication in it. This gets injected through the pen. There are different sizes of pen needle available depending upon the length and ... Read more
