Ok, no measurements have been done to verify the functionality, but that doesn't mean we cannot be allowed to get ahead of ourselves... Discussing the casing with my great colleague Borut we had some ideas on plastic casings and then soft casings made out of silicone. It turns out, of course it does, that there is a kind of silicone resin to be bought that is "medical grade". According to Wikipedia:
Medical grade silicones are silicones tested for biocompatibility and are appropriate to be used for medical applications. (...) Medical grade silicones are generally grouped into three categories: non implantable, short term implantable, and long-term implantable.
The list of examples given are
- Feeding tubes
- Implants for long and short term use
- Seals and gaskets
- Syringe pistons
- Scar Treatment Silicone Sheets (FDA Class 1 Medical Device) and gels.
- Menstrual cups
- Sex toys
- Non-Stick Containers
- Respiratory masks
Some fun examples here :-)
So Borut came back the next day with some pretty well thought out ideas on how the casing should work, how the edges should bevel with a shallow angle so the casing can integrate better with the skin of the user, how the PCB can be slid into the elastic casing with the USB port still accessible, how the mold would look in detail with a insert as negative space for the PCB and how the leads for the logger would also need to be printed on the insert. Few days later and he's made CAD models for the mold!