Dascor,
Nucore, Neudisc and many others are all part of new wave of nucleus replacement system that started with RayMedica PDN (prosthetic disc nucleus) many years ago. I've seen some of these systems implanted... basically, there is an endoscopic discectomy followed by implantation of the replacement core, also via the endoscope. I think you'll find both Dascor and Nucore patients on the forum here. The technology looks very promising, but still are not the magic bullet we are hoping for. When it works, it's amazing (like all spine surgeries), but these procedures still comes with all the uncertainty of all the spine surgeries that we face.