Ah, it’s nice to see that I’m not the only one aware of how problematic subQ infusion of insulin is. I never see anyone discuss this most obvious issue when discussions appear regarding so-called “smart pumps”, or “closed-loop (BS) pumps”, or the worst, “artificial pancreas”. All of those terms make me want to yell at the screen, as there is no way subQ infusion is going to allow for true closed-loop operation; at least none that is safe and effective. Marketing types would have diabetics believe that a closed-loop pump is just around the corner, and to top it off, MM keeps applying the hype to each successive model number, despite the fact that there’s very little difference in infusion between the latest model and the 551. Sure, they tout how the pump can suspend when it gets a low-glucose reading from the sensor, but IMO those MM sensors aren’t even accurate enough to trust, and simply suspending isn’t going to get you out of a low anyway. What you need is to eat some carbs! Suspending is great for periods of activity, but once you are in the throes of a low, suspending is essentially worthless. I’ve read so many complaints from users of the 670 that the AUTO MODE is more of a PITA than just using the pump in manual mode. Doesn’t surprise me one bit! (And MM calls that model a “Hybrid Closed Loop” pump. I call BS).
You want to do TRUE closed loop, you better think about delivering insulin directly into the bloodstream. And you better think about having such a system be hooked to a totally accurate, failsafe (redundancy built in) glucose sensor. No margin for error.