Surgical, medical, dental and veterinary apparatus and instruments, namely, medical devices for detecting and measuring photoplethysmography (PPG) signals for heart rate (HR), oxygen level (SpO2) and other vitals, for detecting and measuring low light imaging photonics, and for detecting and measuring spectroscopic spectra emissions for medical purposes; artificial limbs, eyes and teeth; orthopedic articles, namely, medical devices for use in orthopedic surgery for detecting and measuring pho...