Plenty of films are bio compatible. PE, PP, PU, pretty much everything. You will need a converter. I have used Plitek and place out in CA but the name escapes me. There is a long list of converters listed on MDDI.
Of course your biggest worry with an implantable is the creation of a biofilm on your device. You can get films with a silver and other antimicrobial coatings but I have yet to see any in vivo evidence that they work. There are films that will dissolve over time, lowering your biofilm risk.