I don’t understand your reasoning for this statement. Sure the digital data transmission will be uncorrupted, and the digital calculations in the processor and memory are unlikely to be glitched, but I don’t see why the analog sensing circuits couldn’t age into inaccuracy.
I’ve heard that reasonable-sounding explanation many times; it just seems to make so much sense that somehow the sensing chemicals “get used up.” Unfortunately, it is an “alternate fact.” I wish there were some way to stop its spread in favor of the actual scientific knowledge on the topic. The catalyst doesn’t get used up, it merely facilitates a chemical reaction.
Research that I found on the topic of CGM sensor degradation (when looking nearly a decade ago) principally attributes it to bio-fouling and encapsulation processes associated with the tissue’s foreign-body response (like when you get a splinter). A key job of the highly-proprietary coatings the manufacturers apply to the sensor wire is to try to make the sensor “invisible” to the body so as not to provoke the foreign-body response. (The coatings also throttle the glucose and oxygen transport to control the catalytic reaction to a rate that is good for measurement.)
Anyway, it’s not my field of expertise so I’m pleased to be corrected if I have misread the literature or if the papers I read are bad, but here are some references that I came across all those years ago.
“Estimating Plasma Glucose from Interstitial Glucose: The Issue of Calibration Algorithms in commercial Continuous Glucose Monitoring Devices”
The first few pages give an overview of the technology in 2010 and describe the chemistry that makes it work, and on page 10941 it describes the causes of sensor degradation as inflammation, encapsulation, bio-fouling.
“A Subcutaneous Glucose Sensor With Improved Longevity, Dynamic Range, and Stability of Calibration”
On page 209 it describes one system of protective sensor coatings for an implantable sensor. On page 213 it states “an enzyme electrode sensor involves … no consumable reagents”
“Amperometric Glucose Sensors: Sources of Error and Potential Benefit of Redundancy” http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2825644/
They describe how the technology works, and note things like pressure lows, the trauma lows during the hours after sensor insertion, and the phenomenon of bio-fouling reducing sensor output over time.
“A Review of the Foreign-body Response to Subcutaneously-implanted Devices: The Role of Macrophages and Cytokines in Biofouling and Fibrosis”
This article goes into depth on the topic of bio-fouling, causes and techniques for mitigation.
Here are 3 more references that also touch on sensing and sensor degradation if you’re really interested; I haven’t checked these links to see if they are still live.
“Estimating Plasma Glucose from Interstitial Glucose: The Issue of Calibration Algorithms in Commercial Continuous Glucose Monitoring Devices”
“Electrochemical Glucose Sensors and Their Applications in Diabetes Management”
“Glucose sensors: a review of current and emerging technology”