Medtronic Simplera CGM with InPen Smart Insulin Pen System

For years Medtronic's sensor hardware was the weak link in its diabetes portfolio, so the Simplera is a notable course correction: an all-in-one disposable puck with the transmitter built in, worn flat on the back of the upper arm, at roughly half the bulk of the Guardian 4 it replaces. Paired with the reusable InPen smart insulin pen, it turns what used to be a pump-centric company's offering into something aimed squarely at people managing diabetes with multiple daily injections.

This is the version to look at if you inject rather than pump — the Simplera Sync variant is the one that talks to the MiniMed 780G. In the UK the combination is sold under the MiniMed Go banner, where the app ties sensor glucose, automatic dose logging from the pen and correction-dose suggestions together in one place. The obvious audience is anyone on MDI who has been juggling a separate CGM app and a notebook (or memory) for insulin doses, and who is already inside, or happy to enter, Medtronic's ecosystem.

It is worth being upfront that no pricing has been published to us, and much of what we can assess here is design and indication rather than real-world accuracy data — so treat this as an assessment of the proposition, not a long-term accuracy verdict.

The hardware decisions are the right ones. Combining sensor and transmitter into a single disposable removes the charging-and-pairing ritual that dogged older Medtronic sensors, and the two-step insertion brings it in line with what people already expect from modern CGMs. Dropping fingerstick calibration entirely is the single biggest quality-of-life change here; Medtronic was late to that, but arriving late with the right answer still counts. The anti-lint adhesive that needs no overtape is a small detail that matters enormously in practice, because the sensor that stays on is the sensor that works.

On the pen side, half-unit dosing is the feature that makes InPen worth carrying for children and anyone insulin-sensitive, and automatic dose capture removes the most error-prone part of MDI record keeping. The catch is the one-metre pairing and transmission range: your phone effectively has to be out and next to you every time you dose, which is a meaningful behavioural ask compared with the 20-foot leash on the sensor itself.

The bigger reservations are structural. MiniMed Go accepts only Simplera or Abbott's Instinct sensor, so you are locking yourself into Medtronic's shortlist with no fallback if supply or comfort becomes an issue. A two-hour warm-up is unremarkable but still two hours of blind time per sensor, and seven-day wear means a more frequent replacement cadence than some users will want. There is also an odd gap between the CGM being indicated from age two and the MiniMed Go app being limited to adults when paired with Simplera in the UK — families will need the Instinct route instead, which undercuts the "one system" pitch.

Overall: a credible, well-considered MDI system and unquestionably Medtronic's best sensor hardware to date, but the closed compatibility list, the tight pen-to-phone range and the absence of published pricing keep it just short of an easy recommendation.