RE:FDA LIFT-OFF Still on progress:
https://www.webmd.com/dvt/bioprosthetic-venous-valve-dvt
"Why It’s Ground-Breaking
The VenoValve is the first prosthetic valve that’s kept working 6 months after implants performed in studies. Other types of surgeries have been devised to repair or make new valves, or to transplant or transfer other veins, but they weren’t widely adopted because of poor results or problems with the technology."