Hardware Capabilities
For users who prefer Multiple Daily Injections (MDI) over insulin pumps, smart pens provide the data integration previously exclusive to pumpers. These devices use Bluetooth to broadcast dosing data to smartphones.
| Device | Type | Dose Increment | Integration |
|---|---|---|---|
| Medtronic InPen | Reusable Pen | 0.5 U | Apple Health, MiniMed app |
| NovoPen 6 | Reusable Pen | 1.0 U | NFC to Libre/Glooko |
| NovoPen Echo Plus | Reusable Pen | 0.5 U | NFC (Pediatric focused) |
| Bigfoot Unity | Smart Cap | Depends on pen | Scans Libre 2 directly |
Active Insulin (IOB) Tracking
The primary technical advantage of a smart pen is IOB tracking. By knowing exactly when and how much insulin was injected, the companion app can calculate remaining active insulin using decay curves, similar to closed-loop systems. This prevents dose stacking. You can model this manually with our IOB calculator.
NFC vs. Bluetooth LE
NovoPens utilize Near Field Communication (NFC), requiring the user to tap the pen to their phone to offload data. The InPen uses Bluetooth Low Energy (BLE), allowing passive syncing in the background. The BLE approach is technically superior for real-time data management but requires an internal non-replaceable battery that lasts exactly one year.
FAQ
- Do smart pens track basal insulin?
- Yes, many apps allow you to log long-acting insulin manually, or use a smart cap for your basal pen to track it automatically, ensuring 24/7 coverage data.
- Can I use them with DIY systems?
- While not natively "looping," apps like Nightscout and Tidepool can ingest smart pen data to provide a complete picture of your MDI therapy.