Yes, I just completed reading that whole epic! I also read the links relating to the sensor specifics.
I couldn’t find exact materials listed. More descriptive terms than ingredients as it were. Surely if I were to directly ask the company “does the filament contain Teflon’? Wouldn’t they be legally obliged to disclose.. for example if you’re a cancer survivor (more at risk of exposure to carcinogens), or had an allergy etc?
Within the EU, a manufacturer of a medical device is not obliged to tell you what materials are used in the device although they are legally obliged to disclose the presence of Hazardous Substances in
Accompanying Documents. If there is no mention of carcinogenic materials in the
Accompanying Documents then you may reasonably expect that they are not present in the device.
I have been taking a look at the whole issue of PTFE (Teflon) and carcinogenic properties and my interpretation is that it's not particulary relevent to the Freestyle Libre device anyway. The concern seems to be that when teflon is heated above 300°C (as might be the case with cookware) it can emit free radicals. This was mainly due to the presence of a chemical called Perfluorooctanoic Acid (PFOA), which was previously used to produce the Teflon used on nonstick cookware. Globally, this chemical has not been used in the production of Teflon since 2013.
Furthermore the EU directives relating to the Restriction of Hazardous Substances (RoHS) are very strict and I don't think that Abbot or Dexcom would be allowed to market a device containing carcinogenic materials that were in contact with skin.