I spent not quite an hour with Medtronic’s Help Line earlier today futzing with them about my MiniLink transmitter. When we walked through the complete test script (below) the rep concluded that my MiniLink was defective and needed to be replaced.
What was interesting to me was up until that point I had thought my transmitter was still working just fine. Gosh, So maybe that is why my last few Enlite sensors all seemed to have been manufactured in Wonkytown.
For whatever it’s worth, I have posted below my understanding of the MinkLink test script which the rep walked me through. These steps can also be found in the (large) user guide for either the Paradigm Revel or 530G pumps.
However, I did not find this complete set of steps in the user guide which came with my MiniLink. The only instructions there for using the test plug was to connect the test plug to the transmitter and then verify the green light flashed. In my case, that simply was not enough to tell whether the transmitter was working correctly.
###Testing the MiniLink CGM transmitter using the test plug.
Visually inspect the connector bridge inside of the connection port of the MiniLink for damage.
Speculation: I really have no idea what a damaged connector bridge might look like, but FWIW this is the first thing the Help Line’s script asks you to do.
Turn the Sensor feature of the pump OFF.
I was told it should be off for at least 30 seconds before turning it back on in step 6 below.
Plug the MiniLink transmitter into the charger and charge it for at least 1 minute.
Speculation: I am not sure if the point of this step is to ensure the transmitter has enough of a charge to test it or to ensure the internal logic in the transmitter has been reset. Possibly both?
Very gently and carefully connect the test plug to the transmitter until the flexible side arms of the tester click into the notches on both sides of the transmitter.
Within 20 seconds after connecting the tester, the green light on the transmitter should flash for about 10 seconds. Verify that there are 6 flashes spaced approximately two seconds apart in about 10 seconds. :bulb:— 2 sec —— 2 sec —— 2 sec —— 2 sec —— 2 sec —
Turn the Sensor feature of the pump ON and then perform RECONNECT OLD SENSOR to establish the link between the pump and MiniLink. The connection icon on the pump screen will change from to to indicate that the transmitter and the pump have connected.
Within the next seven to eight minutes, go to the SENSOR STATUS screen by pressing “Escape” three times starting at the main pump screen. Find the Sensor ISIG value. The sensor ISIG value on the status screen should be between 24.00–29.00 nA. This range of ISIG values means that the transmitter electronics are working properly.
Note: The test range is also printed (molded) into the plastic body of the test plug.
If instead you see a Sensor ISIG value that is less than 24.00 nA or more than 29.00 nA, then either the MiniLink is bollocked up or possibly you did the test wrong. Either way, contact Medtronic’s HelpLine and let them walk you through the test again to find out if Medtronic thinks you need to replace your CGM transmitter.