70. Stable, Long-term Multi-grip Control Using Regenerative Peripheral Nerve Interfaces in Humans With Upper-limb Amputations - Philip P. Vu, PhD; Alex K. Vaskov, PhD; Theodore A. Kung, PhD; Cynthia A. Chestek, PhD; Paul S. Cederna, MD; Stephen W.P. Kemp, PhD (Plastic and Reconstructive Surgery, Global Open, 2022)