Foe my NovoRapid injections I use the NovoPen Echo, which takes cartridges and has a memory to tell you what your last dose was and how long ago you took it. (this is a wonderful device for people like me who often forget whether or not they have actually injected.) There doesn’t seem to be any leakage but I will check it carefully the next few times I use it. I also use the Lantus SoloStar pen for my background insulin.