My Life on the Medtronic MiniMed 670G Insulin Pump and More.

Kicked Out of Auto Mode….Again!

Guardian Sensor Stability and Auto Mode

I have been trying to get back to Automode for the better part of my day today. I am not sure what variance the Automode algorithm considers acceptable to enter Automode.  But as you can see my readings in manual mode were not so bad and I would say those were stable sensor readings.

Variance does not look too shabby but Auto Mode did not like it.

There something about the sensor readings that my pump did not like since after a couple of hours (and now in manual mode), the pump requested for a sensor change altogether.

Alarm History Medtronic MiniMed 670G

Lots of alarms prior to my the change sensor alarm

Hooray it is now 12:56AM and I just entered Auto Mode.

I am….exhausted.

Finally In Auto Mode Again at 1 AM

Getting back into Auto Mode was such a chore that took nearly a whole day.

I am starting to wonder whether Auto Mode is worth all the work. But then again Auto Mode sure helps me in cutting down hypoglycemic episodes.

I have noticed that the Contour Next meter, although accurate,  is not as precise. Therefore, it might be contributing to my sensor stability issues by introducing a larger variance. I will cut back on calibrating the sensor just to when the pump requests for a calibration and see whether that helps.

Medtronic Technical Support – Sensor Replacement

I talked to tech support today to get my two sensors that failed consecutively replaced. As usual it is quite an ordeal especially if you are short of time since the representatives have to follow this script that has been given to them.

It is frustrating especially if you are running high or low numbers but having worked in a customer-oriented position I relate to these guys since may companies are so concerned about litigation that they do not allow their customer representatives to freelance.

So you will always get the same questions every time you call Medtronic.

I normally upload my data in CareLink before a technical support call and point the representatives to CareLink as proof that actually my sensor failed and that seems to drive the conversation faster.

Review – What I Love (and Hate) about the Minimed 670G Auto Mode Feature

The MiniMed 670G in AutoMode. The blue shield means it is all-systems-go and in AutoMode.

The MiniMed 670G in AutoMode. The blue shield means it is all-systems-go and in AutoMode.

There is a lot to like about the Auto Mode feature for the Medtronic MiniMed 670G. This feature is analogous to self-driving technology where a car employing this technology drives along fine until the camera hits a blind spot. The same happens for Auto Mode, it works fine until an unexpected situation arises and the Auto Mode algorithm cannot handle this sudden change.

The closed-loop hybrid system is a ground-breaking technology that as a research scientist I really appreciate. Yes it is a work in progress. But its current intricacies and potential to give people with Diabetes better control of their glucose numbers and more freedom to pursue other important things in their lives is really laudable.

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Tunable Settings in Auto Mode for the MiniMed 670G

Tuning Auto Mode for the Medtronic MiniMed 670G is just like tuning an engine. Changing one setting throws off the other settings

Getting Auto Mode settings just right seems to be a balancing act – more fine tuning than just dialing settings up or down

When it comes to Auto Mode for the MiniMed 670G, tuning the settings to get as close to your sugar targets feels a little more complicated as compared to the manual mode. This is because the closed loop system has a feedback mechanism which will likely throw-off one setting when you change another.

In the course of your day, the system is performing a balancing act between bolus and basal to keep you as close to Auto Mode’s fixed and preset BG target of 120mg/dL by introducing a third input – the micro bolus.

When it is all said and done, the user has control of  two settings only, namely Carb Ratio and Active Insulin time.

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Rechargeable Batteries Work with the MiniMed 670G

Sanyo Enloop Rechargeable AA batteries I use with the MiniMed 670G

Sanyo Eneloop Rechargeable AA batteries I use with the MiniMed 670G

I never had luck using AAA rechargeable batteries with the MiniMed 530G. For some reason, the 530G found the batteries not to have enough charge even after I had recharged them completely. Since I started on the MiniMed 670G, I have been using Sanyo Eneloop AA Rechargeable batteries with no issue. The batteries might not last as long as the non-rechargeable ones but they last long enough before they are fully discharged. 

How Do Guardian/Enlite CGM Sensors Work?

Continuous Glucose Monitor

Continuous Glucose Monitoring (CGM) sensors are finicky, expensive and we all know of how much of a process it is for Medtronic to replace faulty sensors. For me, changing Medtronic CGM sensors is a ritual I do not look forward for many reasons. Getting my sensor inserted and working correctly seems to be a hit-or-miss proposition.

But the delicate nature of sensors is due to the fact they are miniature electrodes that are affected by small changes in the environment around them including small movements or presence of interfering chemical substances.

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