Embodiments disclosed herein generally describe a medication delivery system. By defining a message indicating that earlier received packets have all been delivered, it is possible to prevent packet disorder. This allows the provisioning to be conducted in a stateless manner. The catheter apparatus may be operated by inserting a guide catheter into a vasculature with a chronic total occlusion, inserting the catheter apparatus into the guide catheter, and advancing the guidewires through the guidewire lumens and into contact with a chronic total occlusion. The non-inverting buffers have a first inverting gate connected to a continuous voltage terminal and a second inverting gate, collectively sized larger than the first inverting gate and connected to a voltage terminal which is selectively disconnected during the low power mode from the continuous voltage terminal. At maximum power, all coils sets are energized together.