Just for clarity on a few details here...
Well the Medtronic currently used in the UK is the one that pairs up with a Dexcom - but the Dexcom and sensors are not currently as easily available on the NHS as the pumps - you have to be at imminent risk of very severe hypos or other pretty uncontrollable conditions in order to qualify in the first place - a special case has to be made for you in order for funding to be applied for, and that's no guarantee of the purse holders agreeing.
It isn't Dexcom. It is Medtronic's own 'Enlite' sensors with a Guardian transmitter. This is a minor, but quite important distinction, partly because the US has historically had quite a difficult time with the older Medtronic CGM (sofsens etc) and even their early Enlites didn't have as up to date a transmitter as used here which affected BG accuracy. As a consequence, Medtronic CGM has an absolutely terrible reputation in the US, which is slightly unfounded with the newer tech. My experience of the Guardian 2 is excellent, and tracking is significantly closer to my BG meter than Libre on almost all sensors I have used. Dexcom have a great reputation for restart-ability for self-funders, many people regularly getting 14-20 days. I restart all my Enlites and almost always get 12 days (they are officially licensed for 6 days). On rare occasions I can get a second restart. My longest sensor ran for 21 days! But 11-12 is my expectation.
I think it's the Medtronic 640, cos the 630 was a special model specially cos the FDA didn't agree to the 640. They always take longer by insisting on far more human trials than any other country. Having been the guinea pigs - it has been a resounding success with or without a Dexcom - so that's fine, no probs. It also has limited 'communication' from the matching meter and that is what you haven't mentioned at all.
The difference between the 630G and 640G (G standing for 'guardian') is to do with the glucose suspend. Medtronic is the only currently available official tech where the linked CGM can affect insulin delivery. For the 630 and 640's this is about hypo prevention AKA 'low glucose suspend'. On the MM640G the pump watches CGM and *predictively* suspends basal insulin (and any extended bolus delivery in progress) if sensor glucose is heading to be below a person's 'low limit' within 30 minutes. On the MM630G the suspend doesn't happen until the low limit has been reached. It's a minor difference, but means that 630 users have to rely on more alarms to take action, while 640 users can let the pump do it's thing silently and keep them out of bother. Typically I lose 90% of my hypoglycaemia when wearing a sensor linked to my MM640G.
The bolus wizard that calculates your bolus or correction dose taking into account the IOB - is on the Medronic pump itself and so though the meter picks up the BG from the meter, the calculation and ANY delivery (even if done by mental arithmetic or guesswork) has to be done via the pump itself so even if it's buried next to your skin in multi layered Arctic wear - you cannot bolus/correct unless you get it out and use it.
No. I'm afraid that isn't right at all. I've tried a number of times to explain this, but I cannot have been clear.
The full bolus wizard IS on the pump itself exactly as you say.
If you want to manually do a straight bolus of however many units (in 0.1 increments) you can EITHER use the pump OR deliver the bolus from the Contour NextLink 2.4 BG meter.
Additionally you can predefine up to 5 'fancy' boluses which can be picked from a menu. (eg 8 units delivered as a dual wave 60:40 over 2 hours). The snag with these is that they are fixed. You have to know all the details - amount, split and duration - when you define them. I've always found this makes them rather useless so haven't used them... but for example... if I were getting married in a fancy frock and knew that most likely *that* sort of meal needed a blah dose delivered over that period then I could dose that from the BG meter WITHOUT having to fish the pump out, and just make the carbs in the meal fit the predefined dose (like many of us used to do in the old days!)
So there IS some remote bolusing from on the MM640G (I would need to double check about the MM630G as it isn't available here).
But you are quite right that the full bolus wizard, with automated correction calculation and/or offset of correction based on IOB is only available on the pump itself.
Not sure if that it at all understandable?
Here's the 'manual bolus' process:
Incidentally the linked BG meter can also be set to automatically transmit all BG readings to the pump - so that they are always there waiting for you if you are using the full bolus wizard on the pump itself.