there are alot of people all giving the same advice, and you really don’t need anybody else chiming in, but I’m going to anyway. 
I just started a big TO DO list for you and saw your Reply, that is good news, BUT I I know it is disappointing, but also not the end of the world.
Your health comes first, and you can also still reuse your Spark2 after it is properly sterilized (Probably best to get @amal advice here) I imagine you will want to avoid heat treatments so no autoclaves etc but a solution of some sort.
You dont need any infection assistance from us as the doctor will do that for you.
However
If it was me I would also ask the doctor whilst I was there if they could clean it and implant it (I would sell it as a learning experience, or let a intern or nurse do it, and explain you are going to do it anyway so might as well be done buy a medical professional…Worse they can say is No. If you dont ask you dont get.)
Don’t forget to take the literature for installers
Otherwise I would be going back to the original Piercer, get their assistance to re-sterilize and implant with a piercing needle.
Again, as a learning experience. AND to make amends.
Check out DT guide for a flex installation with a needle.
Same principle should apply
Needle Procedure
- Incise skin using a 4g (5mm diameter) piercing needle, bevel side down
- Carefully insert the needle to a depth of at least 35mm
- Be sure to lift the skin ahead of the needle’s point as you insert it
- Slide flex device under skin with sterile gloves – no forceps or tools
- Achieve complete hemostasis before applying bandaging
- Use re-enforced butterfly bandage or dermal strips to pull wound closed
- Apply transparent film (tegaderm) dressing overtop the dermal strips
- While hemostasis is maintained, do not remove bandaging for 7-10 days
But that’s just me