FDA has cleared Novo Nordisk’s NovoPen Echo insulin injection device, which is the only one available in the U.S. that is capable of delivering half-unit doses of insulin.

Diabetes is a group of diseases with one thing in common - a problem with insulin. The problem could be that your body doesn't make any insulin, doesn't make enough insulin or doesn't use insulin properly.
Type 1 Diabetes - This type of diabetes is an autoimmune disease. Your immune system turns on itself and destroys the insulin-producing cells in your pancreas. Although Type 1 diabetes usually develops in childhood or teen years, it can appear later.
Type 2 Diabetes -In this type, your pancreas makes some insulin, but not enough. Your cells also can become resistant to insulin's effects, keeping insulin from escorting enough glucose into your body's cells. Type 2 diabetes generally develops after age 40. However, doctors are seeing a rise in childhood Type 2 diabetes that parallels the rise in obesity among youth.
Source-Medindia