A Research Study of How Faster-acting Insulin Aspart Moves Into, Through, and Out of the Body and How it Works in the Body When Given Through an Insulin Pump to People With Type 1 Diabetes

The aim of the study is to compare the pharmacokinetics (i.e. the course of the blood concentrations of the administered trial drug) of faster-acting insulin aspart (faster aspart), and the currently marketed formulation of insulin aspart (NovoRapid®) when given as a bolus using an insulin pump in people with type 1 diabetes. The pharmacodynamic response (i.e. the course of the blood sugar lowering effect of the administered trial drug) and the safety and tolerability of faster aspart and NovoRapid® will also be assessed. The participants will be in the study for approx. 21 days. Each participant will have 5 visits to the clinic, with an overnight stay at both dosing visits. Participants will have a number of tests, and they will have to give blood and urine samples.