# Could a closed-loop system deal with my use case? **URL:** \ **Category:** Treatment\ **Created:** [February 13, 2019, 4:35pm UTC](https://forum.fudiabetes.org/t/could-a-closed-loop-system-deal-with-my-use-case/6597 "2019-02-13T16:35:04Z")\ **Posts on this page:** 1\ **Showing post:** 33
**Author:** ![Nickyghaleb](https://avatars.discourse-cdn.com/v4/letter/n/5f8ce5/32.png) [@Nickyghaleb](https://forum.fudiabetes.org/u/Nickyghaleb)\ **Post date:** [February 14, 2019, 4:16pm UTC](https://forum.fudiabetes.org/t/could-a-closed-loop-system-deal-with-my-use-case/6597/33 "2019-02-14T16:16:23Z")
> [@One of these things is not like the other - A discussion of CGM and Meter accuracy](https://forum.fudiabetes.org/t/one-of-these-things-is-not-like-the-other-a-discussion-of-cgm-and-meter-accuracy/6577/56): > > So any system that doesn’t turn off and stay off when necessary would always be a problem. Interesting fact… the 670G, upon reaching its _true_ limit of Minimum Delivery (less than .025 units per hour for a total of 2.5 hours), will require the user to put in a BG in order to remain in Auto Mode. If one fails to put in a BG upon request, one will be sent to _Safe Basal_ until doing so. Safe Basal is another Auto Mode function where your delivery is calculated by the algorithm based on recent history. You can remain in Safe Basal for up to 90 minutes, but if you have failed to give it a BG before that time is up, you will be deposited back into Manual Mode, full Basal settings restored, _without and suspends_. The only way to activate your suspends upon leaving Auto Mode is to manually turn them on. It’s a major concern of 670G’s users— the fact the pump will not keep your Suspend feature saved. So in theory, one could experience a low blood sugar in the middle of the night while in Auto, be handed the limit of 2.5 hours of Minumum Delivery, be asked for a BG, fail to provide one due to being asleep or otherwise incapacitated, have been receiving insulin throughout that 90 minute period, and then be deposited back into Manual, full basal, without a suspend to catch them. And that piece about sleeping through the 90 minute Safe Basal?? Happens _all of the time_. Serious design flaw. --- _[View the full topic](https://forum.fudiabetes.org/t/could-a-closed-loop-system-deal-with-my-use-case/6597)._