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Message: <blockquote data-quote="tim2000s" data-source="post: 1303581" data-attributes="member: 30007">Just to be clear here, that data on my blog is from me using OpenAPS and Loop, not the 670. I compared the self reported data from OpenAPS with the Medtronic Study here: <a href="http://www.diabettech.com/medtronic/comparing-openaps-and-the-medtronic-hybrid-closed-loop-system-what-does-the-data-say/" target="_blank">http://www.diabettech.com/medtronic/comparing-openaps-and-the-medtronic-hybrid-closed-loop-system-what-does-the-data-say/</a> The data in this latter one is from the presentation that Medtronic gave at EASD2016, which was promptly not allowed to be shared. The main difference between using a Hybrid Closed loop and something with a predictive low suspend is how it looks ahead. The Hybrid Closed loop has a model against which it compares the data you enter for meals, the change in glucose levels it sees and what it knows the background basal rate to be. If the actual glucose deviates from the prediction, then it either adds or removes basal rate to bring the actual value in line with the predicted value. Typically it looks out for the Insulin Duration time in the Open Source platforms. Even with the best will in the world, by sugar surfing and glancing at your CGM, you have to do it a lot to maintain the same Hba1C and variability. What the loop does is make a decision when your glucose level is in a normal range, not when an alarm is sounding, so it takes effect that much earlier. It works very effectively.The conversation I had with Medtronic on this point suggested that it may be possible that 640s wouldn't be replaced with 640s if they broke, once the 670 was available.</blockquote>

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