Silk Protein Microparticle-based Filler for Injection Augmentation

Inclusion Criteria: * Unilateral vocal fold immobility with glottal insufficiency present for at least 2 weeks from onset * Willingness to partake in study and follow-up as documented by signed informed consent Exclusion Criteria: * History of allergy/hypersensitivity to silk or silk containing products * History of allergy/hypersensitivity to hyaluronic acid (HA) or HA containing products * History of allergy/hypersensitivity to lidocaine or amide-based anesthetics * History of an autoimmune condition * Significant immunocompromised state (i.e. immunosuppression s/p transplantation) * Pregnancy * Active infection or inflammation in the larynx * Comorbid known laryngeal conditions including but not limited to vocal fold scar, vocal tremor, laryngeal dystonia, etc. that would warrant other interventions for optimal treatment * History of laryngeal surgery * Life expectancy of less than 6 months